UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.    )

Filed by the Registrant  ☒                         Filed by a Party other than the Registrant  ☐

Check the appropriate box:

DNP Select Income Fund Inc.

Duff & Phelps Utility and Infrastructure Fund Inc.

DTF Tax-Free Income 2028 Term Fund Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (check the appropriate box):

DNP SELECT INCOME FUND INC.

DUFF & PHELPS UTILITY AND INFRASTRUCTURE FUND INC.

DTF TAX-FREE INCOME 2028 TERM FUND INC.

200 S. Wacker Drive, Suite 500

Chicago, Illinois 60606

(800) 338-8214

NOTICE OF JOINT ANNUAL MEETING OF SHAREHOLDERS

March 6, 2023

The annual meeting of shareholders of each of DNP Select Income Fund Inc. (“DNP”) and Duff & Phelps Utility and Infrastructure Fund Inc. (“DPG”) and DTF Tax-Free Income 2028 Term Fund Inc. (“DTF” and, together with DNP and DPG, the “Funds”) will be held on March 6, 2023 at 1:00 p.m., Eastern Time, conducted solely online via webcast.

Shareholders will be able to attend and participate in the annual meeting online, vote electronically and submit questions prior to and during the meeting by visiting https://meetnow.global/MWCCUZ6 on the meeting date and at the time noted above and described in the accompanying proxy statement. To participate in the annual meeting, you will need to log on using the control number from your proxy card or meeting notice. The control number can be found in the shaded box. There is no physical location for the annual meeting.

The annual meeting will be held to:

Shareholders of record at the close of business on December 9, 2022 are entitled to vote at the meeting.

For the Board of Directors of each of the Funds,

JENNIFER S. FROMM, Secretary

January 13, 2023

SHAREHOLDERS, WE NEED YOUR PROXY VOTE IMMEDIATELY.

YOUR VOTE IS VITAL. THE JOINT MEETING OF SHAREHOLDERS WILL HAVE TO BE ADJOURNED WITHOUT CONDUCTING ANY BUSINESS IF FEWER THAN A MAJORITY OF THE SHARES ELIGIBLE TO VOTE ARE REPRESENTED. IN THAT EVENT, ONE OR MORE OF THE FUNDS WOULD ADJOURN THE MEETING AND CONTINUE TO SOLICIT VOTES IN AN ATTEMPT TO OBTAIN A QUORUM. TO AVOID THE EXPENSE OF AND THE POSSIBLE DELAY CREATED BY SUCH A SOLICITATION, PLEASE VOTE YOUR PROXY IMMEDIATELY. YOU AND ALL OTHER SHAREHOLDERS WILL BENEFIT FROM YOUR COOPERATION.

Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on March 6, 2023: The proxy statement for the 2023 annual meeting, the form of proxy card and the annual report for the most recently ended fiscal year are available to DNP shareholders at www.dpimc.com/dnp, to DPG shareholders at www.dpimc.com/dpg and to DTF shareholders at www.dpimc.com/dtf. There is no physical location for the annual meeting so you cannot attend in person. If you have questions regarding how to access the virtual meeting, please contact the administrator for DNP and DTF at (833) 604-3163 (toll-free) or fa@rwbaird.com or the administrator for DPG at (866) 270-7598 (toll-free) or duff@virtus.com.

JOINT PROXY STATEMENT

The board of directors (the “Board”) of each of DNP Select Income Fund Inc. (“DNP”), Duff & Phelps Utility and Infrastructure Fund Inc. (“DPG”) and DTF Tax-Free Income 2028 Term Fund Inc. (“DTF” and, together with DNP and DPG, the “Funds”) is soliciting proxies from the shareholders of each Fund for use at the joint annual meeting of shareholders to be held on Monday, March 6, 2023 and at any adjournment or postponement of that meeting. A proxy may be revoked at any time before it is voted, either by voting at the meeting or by written notice to the applicable Fund or delivery of a later-dated proxy.

The meeting is scheduled as a joint meeting of the respective shareholders of the Funds because the shareholders of each Fund are expected to consider and vote on similar matters. The Board has determined that the use of a joint proxy statement for the meeting is in the best interest of the shareholders of each Fund. In the event that any shareholder of a Fund virtually present at the meeting objects to the holding of a joint meeting, raises a reasonable basis for the objection, and moves for an adjournment of such Fund’s meeting to a time immediately after the meeting, so that such Fund’s meeting may be held separately, the persons named as proxies will vote in favor of such adjournment. Shareholders of each Fund will vote separately on each of the proposals relating to their respective Fund, and an unfavorable vote on a proposal by the shareholders of one Fund will not affect the implementation by the other Fund of such proposal if the shareholders of such other Fund approve the proposal.

Summary of Proposals to Be Voted Upon

Shareholders of record of each Fund at the close of business on December 9, 2022 are entitled to notice of and to participate in the meeting. On the record date: DNP had 354,854,867 shares of common stock outstanding and 2,070 shares of preferred stock outstanding, DPG had 38,115,078 shares of common stock outstanding and 1,600,000 shares of preferred stock outstanding and DTF had 7,029,567 shares of common stock outstanding and 400 shares of preferred stock outstanding. Each share of common stock outstanding on the record date entitles the holder thereof to one vote for each director being elected by the common stock (with no cumulative voting permitted) and to one vote on each other matter. Each share of preferred stock outstanding on the record date entitles the holder thereof to one vote for each director being elected by the preferred stock (with no cumulative voting permitted) and to one vote on each other matter.

This proxy statement is first being mailed on or about January 13, 2023. The Funds will bear the cost of the annual meeting and this proxy solicitation. Total costs for the annual meeting and proxy solicitation, including

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printing and mailing proxy materials, are estimated at $260,000, and will be charged to the respective Funds based on their proportion of shareholder accounts except where another alternative allocation methodology is deemed more appropriate.

1. ELECTION OF DIRECTORS

The Board of each Fund is responsible for the overall management and operations of that Fund. As of the date of this joint proxy statement, the Board of each Fund is comprised of five directors. Directors of each Fund are divided into three classes and are elected to serve staggered three-year terms.

The persons named in the enclosed proxy intend to vote in favor of the election of the persons named below (unless otherwise instructed). Each of the nominees has consented to serve as a director of the Funds, if elected. In case any of the nominees should become unavailable for election for any unforeseen reason, the persons designated in the proxy will have the right to vote for a substitute.

Election of DNP Director (Proposal 1a. and 1b.)

At the meeting, holders of DNP common stock are entitled to elect one director for a term ending in 2026 (Ms. Cusack is the nominee for that term) as well as one director for a term ending in 2025 (Mr. Vitale is the nominee for that term) and the holders of DNP preferred stock are entitled to elect one director for a term ending in 2026 (Ms. McNamara is the nominee for that term). If elected, Ms. Cusack and Ms. McNamara will serve until the annual meeting of shareholders in 2026 and until their respective successors are elected and qualified, and Mr. Vitale will retire following the annual meeting of shareholders in 2025, pursuant to the Funds’ director retirement policy. A plurality of votes cast at the meeting by the holders of DNP common stock as to the directors representing the common stock is necessary to elect those directors. A plurality of votes cast at the meeting by the holders of DNP preferred stock as to the director representing the preferred stock is necessary to elect that director. Abstentions and broker-non-votes will be counted for purposes of determining whether a quorum is present at the meeting, but will not affect the determination of whether a director candidate has received a plurality of votes cast.

Election of DPG Director (Proposal 1c. and 1.d.)

At the meeting, holders of DPG common and preferred stock, voting as a single class, are entitled to elect one director for a term ending in 2026 (Ms. Cusack is the nominee for that term) as well as one director for a term ending in 2025 (Mr. Vitale is the nominee for that term) and the holders of DPG preferred stock are entitled to elect one director for a term ending in 2026 (Ms. McNamara is the nominee for that term). If elected, Ms. Cusack and Ms. McNamara will serve until the annual meeting of shareholders in 2026 and until their respective successors are elected and qualified, and Mr. Vitale will retire following the annual meeting of shareholders in 2025, pursuant to the Funds’ director retirement policy. A plurality of votes cast at the meeting by the holders of DPG common and preferred stock, voting as a single class, as to the directors representing the common and preferred stock is necessary to elect those directors. A plurality of votes cast at the meeting by the holders of DPG preferred stock as to the director representing the preferred stock is necessary to elect that director. Abstentions and broker-non-votes will be counted for purposes of determining whether a quorum is present at the meeting, but will not affect the determination of whether a director candidate has received a plurality of votes cast.

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Election of DTF Directors (Proposal 1e. and 1f.)

At the meeting, holders of DTF common and preferred stock, voting as a single class, are entitled to elect one director for a term ending in 2026 (Ms. Cusack is the nominee for that term) as well as one director for a term ending in 2025 (Mr. Vitale is the nominee for that term) and the holders of DTF preferred stock are entitled to elect one director for a term ending in 2026 (Ms. McNamara is the nominee for that term). If elected, Ms. Cusack and Ms. McNamara will serve until the annual meeting of shareholders in 2026 and until their respective successors are elected and qualified, and Mr. Vitale will retire following the annual meeting of shareholders in 2025, pursuant to the Funds’ director retirement policy. A plurality of votes cast at the meeting by the holders of DTF common and preferred stock, voting as a single class, as to the directors representing the common and preferred stock is necessary to elect those directors. A plurality of votes cast at the meeting by the holders of DTF preferred stock as to the director representing the preferred stock is necessary to elect that director. Abstentions and broker-non-votes will be counted for purposes of determining whether a quorum is present at the meeting, but will not affect the determination of whether a director candidate has received a plurality of votes cast.

Biographical Information about Nominees and Continuing Directors

Set forth in the table below are the names and certain biographical information about the nominees for the position of director and the continuing directors of the Funds. Except as noted:

All of the directors of the Funds (including the director nominees) are classified as independent directors because none of them are “interested persons” of the Funds, as defined in the Investment Company Act of 1940 (the “1940 Act”). Each of the current directors formerly served on the Board of Directors of Duff & Phelps Utility and Corporate Bond Trust Inc. until its merger into DNP in March 2021. The term “Fund Complex” refers to the Funds and all other investment companies advised by affiliates of Virtus Investment Partners, Inc. (“Virtus”), the Adviser’s parent company. The address for all directors is c/o Duff & Phelps Investment Management Co., 200 South Wacker Drive, Suite 500, Chicago, Illinois 60606.

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Board Leadership Structure

The Board believes that the most appropriate leadership structure for the Funds is for the Chairman of the Board to be an independent director, in order to provide strong, independent oversight of each Fund’s management and affairs, including each Fund’s risk management function. Accordingly, while the Chief Executive Officer of the Funds may be elected to serve on the Board, he or she will not normally be eligible to serve as Chairman of the Board. The independent Chairman of the Board presides at meetings of the shareholders, meetings of the Board and meetings of independent directors. In addition, the independent Chairman of the Board takes part in the meetings and deliberations of all committees of the Board, facilitates communication among directors and communication between the Board and the Funds’ management and is available for consultation with the Funds’ management between Board meetings. The Board has four standing committees, which are described below: the executive committee, the audit committee, the contracts committee, and the nominating and governance committee.

The executive committee of the Board is currently comprised of Mr. Vitale (Chairman), Mr. Burke, Ms. McNamara and Ms. Moran, and has authority, with certain exceptions, to exercise the powers of the Board between Board meetings.

The audit committee of the Board is currently comprised of all independent directors of the Funds (Mr. Burke, Chairman) and makes recommendations regarding the selection of each Fund’s independent registered public accounting firm and meets with representatives of that accounting firm to determine the scope of and review the results of each audit and assists the Board in overseeing each Fund’s accounting, auditing, financial reporting and internal control functions.

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The contracts committee of the Board is currently comprised of all independent directors of the Funds (Ms. Moran, Chairperson) and makes recommendations regarding each Fund’s contractual arrangements for investment management and administrative services, including the terms and conditions of such contracts.

The nominating and governance committee of the Board is currently comprised of all independent directors of the Funds (Ms. McNamara, Chairperson) and selects nominees for election as directors, recommends individuals to be appointed by the Board as officers of the Funds and members of Board committees and makes recommendations regarding other Fund governance and Board administration matters. The committee also oversees the Board’s continuing education program, which includes quarterly presentations for directors covering a variety of topics, including, among other topics, (i) the industries and types of investments in which the Funds invests, (ii) investment techniques utilized by the Funds, (iii) current developments in securities law and the mutual fund industry, (iv) best practices in corporate and mutual fund governance and (v) enterprise risk management, cybersecurity, and other emerging issues.

In addition to the four standing committees, the DNP Board also has a special committee called the ATM committee, which is comprised of the members of the executive committee of the DNP Board (Mr. Vitale (Chairman), Mr. Burke, Ms. McNamara and Ms. Moran) and is responsible for certain oversight functions in connection with DNP’s ongoing “at-the-market” (“ATM”) offering program.

During DNP’s fiscal year ended October 31, 2022, the DNP Board met five times and acted twice by written consent; the DNP audit committee met three times; the DNP nominating and governance committee met four times and acted once by written consent; the DNP contracts committee met two times; the DNP executive committee did not meet or act by written consent; and the DNP ATM committee did not meet or act by written consent. During DPG’s fiscal year ended October 31, 2022, the DPG Board met five times and acted twice by written consent; the DPG audit committee met three times; the DPG nominating and governance committee met four times and acted once by written consent; the DPG contracts committee met two times; and the DPG executive committee did not meet or act by written consent. During DTF’s fiscal year ended October 31, 2022, the DTF Board met five times and acted three times by written consent; the DTF audit committee met three times; the DTF nominating and governance committee met four times and acted twice by written consent; the DTF contracts committee met three times; and the DTF executive committee did not meet or act by written consent. Each director attended at least 75% in the aggregate of the meetings of the Board and of the committees on which he or she served.

Risk Oversight. The audit committee charter provides that the audit committee is responsible for discussing with management the guidelines and policies that govern the process by which management assesses and manages each Fund’s major financial risk exposures. The contracts committee charter provides that in assessing whether each Fund’s investment advisory agreement and administration agreement should be continued, the contracts committee is to give careful consideration to the risk oversight policies of the Adviser and each Fund’s administrator, respectively. In addition, the audit committee and the full Board receive periodic reports on enterprise risk management from the chief risk officer of the Adviser.

Nomination of Directors. The nominating and governance committee acts under a written charter that was most recently amended on December 17, 2020. A copy of the charter is available on each Fund’s website at www.dpimc.com/dnp, www.dpimc.com/dpg and www.dpimc.com/dtf and in print to any shareholder who requests it. None of the members of the nominating and governance committee are “interested persons” of the Funds as defined in Section 2(a)(19) of the 1940 Act. In identifying potential director nominees, the nominating

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and governance committee considers candidates recommended by one or more of the following sources: the Funds’ current directors, the Funds’ officers, the Funds’ shareholders and any other source the committee deems appropriate. The committee may, but is not required to, retain a third-party search firm at the Funds’ expense to identify potential candidates. Shareholders wishing to recommend candidates to the nominating and governance committee should submit such recommendations to the Secretary of the Funds, who will forward the recommendations to the committee for consideration. See also “Shareholder Proposals and Nominations” under “Other Information” below.

Criteria for Director Nominations. The goal of the Funds is to have a board of directors comprising individuals with a diversity of business, educational and life experiences (including, without limitation, with respect to accounting and finance, business and strategic judgment, investment management and financial markets, and knowledge of the industries in which the Funds invest) that will enable them to constructively review, advise and guide management of the Funds. The annual Board self-evaluation process includes consideration of whether the Board’s composition represents an appropriate balance of skills and diversity for the Funds’ needs. In evaluating potential director nominees, including nominees recommended by shareholders, the nominating and governance committee considers such qualifications and skills as it deems relevant but does not have any specific minimum qualifications that must be met by a nominee. The committee considers, among other things:

With respect to the renomination of incumbent directors, past service to the Board is also considered.

Diversity, Equity and Inclusion. In selecting nominees for the position of director, and in appointing officers of the Funds, the nominating and governance committee is required by its charter to consider and seek out candidates who are women or members of racial or ethnic minority groups in order to help promote diversity, equity and inclusion among the members of the Board and the officers of the Funds.

Retirement Policy. The bylaws of the Funds establish a mandatory retirement age of 78 for directors of the Funds. Specifically, no person who has attained the age of 78 years is eligible for election or reelection as a director, and no incumbent director who attains the age of 78 years is qualified to continue serving as a director following the adjournment of the next succeeding annual meeting of shareholders, and therefore his or her

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service on the Board will automatically terminate at such time. None of the director nominees or directors whose terms will continue after the annual meeting are 78 years or older as of the date of this proxy statement or will be 78 years or older as of the scheduled date of the annual meeting.

Officers of the Funds

The officers of the Funds are elected at the annual meeting of the Board held in connection with the annual meeting of shareholders. The officers receive no compensation from the Funds, but are also employees or officers of the Adviser or a Fund administrator, or are employees of an affiliate of the Adviser, and receive compensation in such capacities. The address for all officers listed below is c/o Duff & Phelps Investment Management Co., 200 South Wacker Drive, Suite 500, Chicago, Illinois 60606, except as noted.

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The following table provides certain information relating to the equity securities beneficially owned by each director or director nominee as of October 31, 2022, (i) in DNP, (ii) in DPG, (iii) in DTF and (iv) on an aggregate basis, in any registered investment companies overseen or to be overseen by the director or nominee within the same family of investment companies as the Funds, in each case based on information provided to the Funds, including information furnished by the Funds’ service providers.

Based on information provided to the Funds, including information furnished by the Funds’ service providers, as of October 31, 2022, none of the independent directors, or their immediate family members, owned any securities of the Adviser or any person (other than a registered investment company) directly or indirectly controlling, controlled by or under common control with the Adviser.

The following table sets forth the aggregate compensation paid to each director by each Fund with respect to its most recently completed fiscal year and by the Fund Complex with respect to the fiscal year ended October 31, 2022.

COMPENSATION TABLE⁽¹⁾

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The Board of each of the Funds, including all of the independent directors, unanimously recommends a vote “FOR” the election of the two nominees for director named above.

OTHER BUSINESS

Management is not aware of any other matters that will come before the meeting. If any other business should come before the meeting, however, your proxy, if signed and returned, will give discretionary authority to the persons designated in it to vote according to their best judgment.

OTHER INFORMATION

The Adviser. Duff & Phelps Investment Management Co. acts as investment adviser for each Fund. The address of the Adviser is 200 S. Wacker Drive, Suite 500, Chicago, Illinois 60606. The Adviser (together with its predecessor) has been in the investment management business for more than 75 years and, as of December 31, 2022, had approximately $12.01 billion in client accounts under discretionary management. The Adviser is an indirect, wholly-owned subsidiary of Virtus, a public company whose common stock is traded on the NASDAQ Global Market under the trading symbol “VRTS.”

The Administrators. Robert W. Baird & Co. Incorporated (“Baird”) serves as administrator of DNP and DTF. The address of Baird is 500 West Jefferson Street, Louisville, KY 40202. Founded in 1919, Baird is an employee-owned, international financial services firm. Baird provides private wealth management, asset management, investment banking, capital markets and private equity services to clients through its offices in the United States, Europe and Asia.

Virtus Fund Services, LLC (“Virtus Fund Services”) serves as administrator of DPG. The address of Virtus Fund Services is One Financial Plaza, Hartford, CT 06103. Virtus Fund Services is an indirect, wholly-owned subsidiary of Virtus and acts as administrator and/or transfer agent to registered investment companies, including DPG.

Shareholders. The following table shows shares of common stock of the Funds as to which each director and director nominee, and all directors and executive officers of the Funds as a group, had or shared power over voting or disposition at October 31, 2022. The directors, director nominees and executive officers of the Funds owned no shares of preferred stock of any of the Funds. Shares are held with sole power over voting and

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disposition except as noted. The shares of common stock held by each of the persons listed below and by all directors and executive officers as a group represented less than 1% of the outstanding common stock of each Fund.

To the Funds’ knowledge, as of the date of this proxy statement, the only persons (including any “group” as that term is used in Section 13(d)(3) of the Securities Exchange Act of 1934 (the “1934 Act”)) who beneficially own more than 5% of any class of any Fund’s voting securities (as determined in accordance with Rule 13d-3 under the 1934 Act) are the persons identified in the following table. Except as otherwise indicated, the information in this table is based on information provided in Schedule 13D and 13G filings made with the Securities and Exchange Commission by each of the persons listed.

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Section 16(a) Beneficial Ownership Reporting Compliance. Section 30(h) of the 1940 Act imposes the filing requirements of Section 16 of the 1934 Act upon (i) the Funds’ directors and officers, (ii) the Funds’ investment adviser and certain of their affiliated persons and (iii) every person who is directly or indirectly the beneficial owner of more than 10% of any class of a Fund’s outstanding securities (other than short-term paper). Based solely on a review of the copies of Section 16(a) forms furnished to the Funds, or written representations that no Forms 5 were required, the Funds believe that during each Fund’s most recently completed fiscal year all such filing requirements were complied with, with the exception of a late Form 3 filing by each of the newly appointed portfolio managers of DTF, Ronald Schwartz and Dusty Self.

Report of the Audit Committee. The Funds’ independent directors comprise the audit committee of each Fund and act under a written charter which sets forth the audit committee’s responsibilities. A copy of the audit committee charter is available on each Fund’s website at www.dpimc.com/dnp, www.dpimc.com/dpg and www.dpimc.com/dtf and in print to any shareholder who requests it. Each of the members of the audit committee is independent as defined in the listing standards of the New York Stock Exchange. In connection with the audit of each Fund’s 2022 audited financial statements, the audit committee: (1) reviewed and discussed each Fund’s 2022 audited financial statements with management, (2) discussed with the independent auditors the matters required to be discussed by Statement on Auditing Standards No. 61, as amended (AICPA, Professional Standards, Vol. 1, AU section 380), as adopted by the Public Company Accounting Oversight Board in Rule 3200T, (3) received and reviewed the written disclosures and the letter from the independent accountant required by applicable requirements of the Public Company Accounting Oversight Board regarding the independent accountant’s communications with the audit committee concerning independence, and (4) discussed with the independent accountant its independence from each Fund and its management. Based on the foregoing reviews and discussions, the audit committee recommended to the board of directors that each Fund’s audited financial statements be included in the Annual Report to Shareholders for filing with the Securities and Exchange Commission.

The Audit Committee

Donald C. Burke (Chairman)

Philip R. McLoughlin

Geraldine M. McNamara

Eileen A. Moran

David J. Vitale

Independent Registered Public Accounting Firm. The 1940 Act requires that each Fund’s independent registered public accounting firm be selected by the vote, cast in person, of a majority of the members of the Board who are not interested persons of the Fund. In addition, the listing standards of the New York Stock Exchange vest the audit committee, in its capacity as a committee of the Board, with responsibility for the

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appointment, compensation, retention and oversight of the work of each Fund’s independent registered public accounting firm. In accordance with the foregoing provisions, the firm of Ernst & Young LLP (“Ernst & Young”) has been selected as independent registered public accounting firm of each Fund to perform the audit of the financial books and records of the Funds for the fiscal year ending October 31, 2023. A representative of Ernst & Young is expected to be present at the joint annual meeting of shareholders and will be available to respond to appropriate questions and will have an opportunity to make a statement if the representative so desires.

Pre-Approval of Audit and Non-Audit Services. Each Fund is responsible for the appointment, compensation and oversight of the work of the independent registered public accounting firm. As part of this responsibility, each Fund’s audit committee is required to pre-approve the audit and non-audit services performed by the independent accountant in order to assure that they do not impair the independent accountant’s independence from the Fund. Accordingly, each Fund’s audit committee has adopted a joint audit and non-audit services pre-approval policy (the “Joint Audit Committee Pre-Approval Policy”), which sets forth the procedures and the conditions pursuant to which services proposed to be performed by the independent accountant may be pre-approved. Each engagement of an independent accountant to render audit or non-audit services to a Fund must be either (i) a specific service pre-approved by the Fund’s audit committee or the chairman of the audit committee, to whom the committee has delegated the authority to grant such pre-approvals between scheduled meetings of the committee, or (ii) come within the scope of a general pre-approval granted under the Joint Audit Committee Pre-Approval Policy. As provided in the Joint Audit Committee Pre-Approval Policy, unless a type of service has received general pre-approval (i.e., the proposed services are pre-approved without consideration of specific case-by-case services by the audit committee), then the service will require specific pre-approval by the audit committee if the proposed service is to be provided by the independent accountant. As provided in the Joint Audit Committee Pre-Approval Policy, any proposed services exceeding pre-approved cost levels or budgeted amounts require specific pre-approval by the audit committee. In deciding whether to grant pre-approval for such services, the audit committee, or the chairman of the audit committee acting under delegated authority, as the case may be, will consider whether such services are consistent with the SEC’s rules on auditor independence. Additionally, the audit committee, or the chairman of the audit committee acting under delegated authority, as the case may be, will also consider whether the independent accountant is best positioned to provide the most effective and efficient service, after considering a number of factors as a whole, with no one factor being necessarily determinative.

Each Fund’s audit committee is also required to pre-approve its accountant’s engagements for non-audit services rendered to the Adviser and any entity controlling, controlled by or under common control with the Adviser that provides ongoing services to the Fund, if the engagement relates directly to the operations and financial reporting of the Fund. In deciding whether to grant pre-approval for such non-audit services, the audit committee or the chairman of the audit committee, as the case may be, considers whether the provision of such non-audit services is compatible with maintaining the independence of the Fund’s accountants.

Audit and Non-Audit Fees. The following table sets forth the aggregate audit and non-audit fees billed to each Fund for each of the last two fiscal years for professional services rendered by Ernst & Young. For purposes of this table, to the extent the amount of a fee for a pre-approved service is known as of the date of this report, such fee amount has been allocated to the fiscal year to which the applicable service relates, even in cases where the applicable Fund has not yet been billed for such service.

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Communications with the Board by Shareholders and Other Interested Persons. The Board has adopted the following procedures for shareholders and other interested persons to send communications to the Board. Shareholders and other interested persons may mail written communications to the full Board, to committees of the Board or to specified individual directors in care of the Secretary of the Funds, 200 S. Wacker Drive, Suite 500, Chicago, Illinois 60606. All such communications received by the Secretary will be forwarded promptly to the full Board, the relevant Board committee or the specified individual directors, as applicable, except that the Secretary may, in good faith, determine that a communication should not be so forwarded if it does not reasonably relate to the Funds or their operations, management, activities, policies, service providers, Board, officers, shareholders, or other matters relating to an investment in the Funds or is purely ministerial in nature. Each of the Funds’ directors is encouraged to attend the annual meeting of shareholders. All of the individuals who were directors of the Funds at the time of the March 7, 2022 joint annual meeting of the shareholders of the Funds were in attendance at that meeting.

Shareholder Proposals and Nominations. In order for any shareholder proposal or director nomination to be considered for inclusion in any Fund’s proxy statement and form of proxy for the 2024 annual meeting of shareholders, such proposal or nomination must be received by the Secretary of the Fund no later than September 15, 2023. Under the circumstances described in, and upon compliance with, Rule 14a-4(c) under the 1934 Act, a Fund may solicit proxies in connection with the 2024 annual meeting which confer discretionary authority to vote on any shareholder proposals of which the Secretary of the Fund does not receive notice by November 29, 2023. Any notice of a shareholder proposal or director nomination must conform to the requirements in the Fund’s bylaws. Copies of the bylaws of any of the Funds may be requested from the Secretary of the Funds, 200 S. Wacker Drive, Suite 500, Chicago, Illinois 60606.

Solicitation of Proxies. Proxies will be solicited by mail. Proxies may be solicited by Fund personnel personally or by telephone, postal mail or electronic mail, but such persons will not be specially compensated for such services. The Funds will inquire of any record holder known to be a broker, dealer, bank or other nominee as to whether other persons are the beneficial owners of shares held of record by such persons. If so, the Funds will supply additional copies of solicitation materials for forwarding to beneficial owners, and will make reimbursement for reasonable out-of-pocket costs. The Funds will bear the cost of the annual meeting and this proxy solicitation. Total costs for the annual meeting and proxy solicitation, including printing and mailing proxy materials, are estimated at $260,000, and will be charged to the respective Funds based on their proportion of shareholder accounts except where another alternative allocation methodology is deemed more appropriate. The Funds do not currently intend to retain any third-party solicitor to contact shareholders regarding this proxy solicitation or to incur any expenses for such a third-party solicitation.

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Further Information About Voting and the Annual Meeting. A majority of the outstanding shares of each Fund entitled to vote at the annual shareholder meeting shall constitute a quorum for purposes of conducting business of the Fund.

The Board has fixed the close of business on December 9, 2022 as the record date for the determination of shareholders of each Fund entitled to notice of, and to vote at, the annual meeting. Shareholders of a Fund on that date will be entitled to one vote on each matter to be voted on for each share held.

Instructions regarding how to vote via telephone or the Internet are included on the enclosed proxy card. The required control number for Internet and telephone voting is printed on the enclosed proxy card. The control number is used to match proxy cards with shareholders’ respective accounts and to ensure that, if multiple proxy cards are executed, shares are voted in accordance with the proxy card bearing the latest date.

The annual meeting will be a completely virtual meeting of shareholders, which will be conducted exclusively by webcast. You are entitled to participate in the annual meeting only if you were a shareholder of the Funds as of the close of business on the record date, or if you hold a valid proxy for the annual meeting. No physical meeting will be held.

You will be able to attend the annual meeting online and submit your questions during the meeting by visiting https://meetnow.global/MWCCUZ6. You also will be able to vote your shares online by attending the annual meeting by webcast.

To participate in the annual meeting, you will need to log on using the control number from your proxy card or meeting notice. The control number can be found in the shaded box.

If you are a registered shareholder, you do not need to register to attend the annual meeting virtually on the Internet. If you hold your shares through an intermediary, such as a bank or broker, you must register in advance in order to attend the meeting. To register to attend the annual meeting online by webcast you must submit proof of your proxy power (legal proxy) reflecting your holdings along with your name and email address to Computershare. You must contact the bank or broker who holds your shares to obtain your legal proxy. Requests for registration must be labeled as “Legal Proxy” and be received no later than 5:00 p.m., Eastern Time, 5 business days prior to the meeting date. You will receive a confirmation of your registration by email after we receive your legal proxy. Requests for registration should be directed to us by emailing an image of your legal proxy, to shareholdermeetings@computershare.com.

The online meeting will begin promptly at 1 p.m., Eastern Time. We encourage you to access the meeting prior to the start time leaving ample time for the check in. Please follow the access instructions as outlined in this proxy statement.

The virtual meeting platform is fully supported across MS Edge, Firefox, Chrome and Safari browsers and devices (desktops, laptops, tablets and cell phones) running the most up-to-date version of applicable software and plugins. Please note that Internet Explorer is no longer supported. Participants should ensure that they have a strong WiFi connection wherever they intend to participate in the meeting. We encourage you to access the meeting prior to the start time. A link on the meeting page will provide further assistance should you need it or you may call 1-888-724-2416 or 1-781-575-2748.

24

All shares represented by properly executed proxies received prior to the annual meeting will be voted at the annual meeting in accordance with the instructions marked thereon or otherwise as provided therein. If any other business is brought before the annual meeting, your shares will be voted at the proxies’ discretion. If you sign the proxy card, but do not fill in a vote, your shares will be voted “FOR ALL” of the nominees for director, in accordance with the recommendation of the Board.

Shareholders who execute proxy cards or record their voting instructions via telephone or the Internet may revoke their proxies at any time prior to the time they are voted by giving written notice to the Secretary of the Funds, by delivering a subsequently dated proxy (including via telephone or the Internet) prior to the date of the annual meeting or by virtually attending and voting at the annual meeting. Merely virtually attending the annual meeting, however, will not revoke a previously submitted proxy.

Annual Report. Each Fund will provide without charge to any shareholder who so requests, a copy of the Fund’s annual report for the Fund’s most recently completed fiscal year. The annual reports for DNP and DTF are available by calling Baird toll-free at (833) 604-3163 and are also available on each such Fund’s web site at www.dpimc.com/dnp and www.dpimc.com/dtf. The annual report for DPG is available by calling Virtus Fund Services toll-free at (866) 270-7598 and is also available on DPG’s web site at www.dpimc.com/dpg.

General. A list of shareholders of each Fund entitled to be present and vote at the annual meeting will be available at the offices of the Funds, 200 S. Wacker Drive, Suite 500, Chicago, Illinois 60606, for inspection by any shareholder during regular business hours for ten days prior to the date of the meeting.

Failure of a quorum of shareholders of any of the Funds to be present at the annual meeting will necessitate adjournment of the meeting with respect to those Funds and will give rise to additional expense.

EVERY SHAREHOLDER VOTE IS IMPORTANT. WE ENCOURAGE YOU TO TAKE ADVANTAGE OF INTERNET OR TELEPHONE VOTING. BOTH ARE AVAILABLE 24 HOURS A DAY, 7 DAYS A WEEK.

January 13, 2023

25

PO Box 43131 Providence, RI 02940-3131 IMPORTANT PROXY INFORMATION Your Vote Counts! PLEASE USE THE 14-DIGIT CONTROL NUMBER & 8-DIGIT SECURITY CODE LISTED IN THE BOXES BELOW WHEN REQUESTING MATERIAL VIA THE TELEPHONE & INTERNET. When you are ready to vote, you can use the same Control Number & Security Code to record your vote.
Shareholder Meeting Notice – THIS IS NOT A PROXY – Please read carefully for voting instructions.
Important Notice Regarding the Availability of Proxy Materials for the DNP Select Income Fund Inc. Shareholders Meeting to be held virtually on March 6, 2023.
As a shareholder, it is important for you to vote! On the back of this notice, you will find a summary of the proposals that require a shareholder vote at the Meeting. This communication is NOT a form for voting and presents only an overview of the more complete proxy materials that are available to you on the Internet or by mail. We encourage you to access and review all of the important information contained in the proxy materials before voting. The Joint Proxy Statement for the Meeting and Form of Proxy are available at: https://www.proxy-direct.com/dnp-33055 If you want to receive a paper copy of the documents or an email with a link to the documents, you must request them. There is no charge to you for requesting a copy. Paper materials will be mailed to the address on file within 3-business days of receipt of the request. Please make your request as soon as possible, but no later than February 23, 2023, to facilitate timely delivery. The Meeting of Shareholders of DNP Select Income Fund Inc. will be held virtually at the following website: meetnow.global/MWCCUZ6 on March 6, 2023, at 1:00 p.m., Eastern Time. To participate in the Virtual Meeting enter the 14-digit control number from the shaded box on this notice. ONLINE MATERIAL ACCESS AND PAPER COPY REQUESTS CAN BE MADE UTILIZING ONE OF THE THREE METHODS BELOW. YOU CAN ALSO USE ONE OF THESE THREE METHODS TO ELECT A PERMANENT DELIVERY PREFERENCE FOR FUTURE MEETINGS.
ACCESS MATERIALS AND VOTE OR REQUEST PAPER DELIVERY OF MATERIALS
EASY ONLINE ACCESS – REQUEST BY INTERNET Log on to the Internet and go to: https://www.proxy-direct.com/dnp-33055
On this site you can view the Proxy Statement and Form of Proxy online, request paper copies, request an email with a link to the materials and/or set future delivery preferences. Just follow the steps outlined on this secure website. TELEPHONE REQUESTS - CALL 1-877-816-5331 Obtain paper copies of the Proxy Statement and/or Form of Proxy with an option to set future delivery preference by touch tone phone. Call toll free from the U.S. or Canada at NO CHARGE to you. Follow the instructions provided in the recorded messages. E-MAIL REQUEST AT: proxymaterials@computershare.com: Email us to request Proxy Materials for the shareholder meeting and/or to
set future delivery preferences.
- Provide only your 14-Digit Control Number and 8-Digit Security Code as listed on this notice in your email request for materials.
- If you want to elect to receive all future proxy materials in paper form or via email, please note your request and for email, provide the address.
PAPER COPY REQUESTS SHOULD BE MADE NO LATER THAN FEBRUARY 23, 2023, TO FACILITATE TIMELY DELIVERY.
DNP_33055_NA_122722

Your Fund Holdings: FUND DNP SELECT INCOME FUND INC. The following matters will be considered at the Meeting: 1a.    Election of Directors. The Board of Directors unanimously recommends that shareholders vote “FOR” the nominees to the Board of Directors identified in the Proxy Statement. Please refer to the Proxy Materials for further details on the proposal.
YOUR VOTE IS IMPORTANT NO MATTER HOW MANY SHARES YOU OWN
Common Questions about Notice and Access Why am I receiving a Notice of Internet Availability instead of a Proxy card and Proxy statement? Your fund has elected to utilize a distribution model authorized by the Securities and Exchange Commission in 2007. This model, known as Notice and Access, allows mutual funds and public companies to send you a Notice instead of a full set of printed proxy materials. As a shareholder, you can select the means by which you access those proxy materials. You can view the materials electronically via the Internet, or request a full set of printed materials for this Shareholder Meeting and all future meetings, or you can make that choice on a case by case basis. How do I access the materials, set my preference for future shareholder meeting materials and record my vote? On the front side of this Notice are easy to follow instructions on how to access Proxy materials electronically or request a full set of printed materials. Once you are on the website or ordering on the phone, you can also make your selection for future meetings. When you are ready to vote, electronic voting is available by Internet or Touch Tone Phone by using the Control Number and Security Code on the front of this Notice. The Touch Tone voting phone number is different from the ordering phone number and is displayed on the website. If you want to vote via Mail, you will need to request a paper copy of the materials to receive a Proxy Card and Return Envelope. If I request printed proxy materials, how long will it take for me to receive them? The SEC rule requires that the materials be sent via first class mail within three business days of receipt of your request. DNP_33055_NA_122722

PO Box 43131 Providence, RI 02940-3131 EVERY VOTE IS IMPORTANT EASY VOTING OPTIONS: VOTE ON THE INTERNET Log on to: www.proxy-direct.com or scan the QR code Follow the on-screen instructions available 24 hours VOTE BY PHONE Call 1-800-337-3503 Follow the recorded instructions available 24 hours VOTE BY MAIL Vote, sign and date this Proxy Card and return in the postage-paid envelope VOTE AT THE VIRTUAL MEETING at the following Website: meetnow.global/MWCCUZ6 on March 6, 2023 at 1:00 p.m., Eastern Time. To Participate in the Virtual Meeting, enter the 14-digit control number from the shaded box on this card. Please detach at perforation before mailing. PROXY DNP SELECT INCOME FUND INC. JOINT ANNUAL MEETING OF SHAREHOLDERS TO BE HELD ON MARCH 6, 2023 COMMON STOCK PROXY SOLICITED BY MANAGEMENT FROM COMMON SHAREHOLDERS. Jennifer S. Fromm, Kathleen L. Hegyi, Alan M. Meder, and Daniel J. Petrisko or any of them, each with full power of substitution, are authorized to vote all shares of common stock of DNP Select Income Fund Inc. (the “Fund”) owned by the undersigned at the Joint Annual Meeting of Shareholders to be held virtually at the following Website: meetnow.global/MWCCUZ6 March 6, 2023, at 1:00 p.m., Eastern Time, and at any adjournment of the meeting. To participate in the Virtual Meeting enter the 14-digit control number from the shaded box on this card. They shall vote in accordance with the instructions set forth on the reverse side hereof. VOTE VIA THE INTERNET: www.proxy-direct.com VOTE VIA THE TELEPHONE: 1-800-337-3503 To change the address on your account, please check the box at right and indicate your new address in the address space below. Please note that changes to the registered name(s) on the account may not be submitted via this method. To change the address on your account, please check the box at right and indicate your new address in the address space below. Please note that changes to the registered name(s) on the account may not be submitted via this method.    ☐ DNP_33055_122722 PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY PROMPTLY USING THE ENCLOSED ENVELOPE. xxxxxxxxxxxxxx                code

EVERY SHAREHOLDER’S VOTE IS IMPORTANT We encourage you to take advantage of Internet or telephone voting. Both are available 24 hours a day, 7 days a week. Important Notice Regarding the Availability of Proxy Materials for the Joint Annual Meeting of Shareholders to Be Held on March 6, 2023. The Notice of Meeting, Joint Proxy Statement and Proxy Card are available at: https://www.proxy-direct.com/dnp-33055 Please detach at perforation before mailing. If no specific instructions are provided, this proxy will be voted “FOR” the election of the directors and in the discretion of the proxies upon such other business as may properly come before the meeting. TO VOTE MARK BLOCKS BELOW IN BLUE OR BLACK INK AS SHOWN IN THIS EXAMPLE:    X A Proposal    The Board of Directors recommends a vote “FOR” the nominees listed. 1a. Election of Directors: FOR                WITHHOLD 01.    Mareilé B. Cusack 02. David J. Vitale B Authorized Signatures — This section must be completed for your vote to be counted — Sign and Date Below Note: Please sign exactly as your name(s) appear(s) on this Proxy Card, and date it. When shares are held jointly, each holder should sign. When signing as attorney, executor, guardian, administrator, trustee, officer of corporation or other entity or in another representative capacity, please give the full title under the signature. Date (mm/dd/yyyy) — Please print date below    Signature 1 — Please keep signature within the box Signature 2 — Please keep signature within the box / / Scanner bar code     xxxxxxxxxxxxxx                DNP1 33055                xxxxxxxx 

PO Box 43131 Providence, RI 02940-3131 IMPORTANT PROXY INFORMATION Your Vote Counts! PLEASE USE THE 14-DIGIT CONTROL NUMBER & 8-DIGIT SECURITY CODE LISTED IN THE BOXES BELOW WHEN REQUESTING MATERIAL VIA THE TELEPHONE & INTERNET. When you are ready to vote, you can use the same Control Number & Security Code to record your vote. Shareholder Meeting Notice – THIS IS NOT A PROXY – Please read carefully for voting instructions. Important Notice Regarding the Availability of Proxy Materials for the DNP Select Income Fund Inc. Shareholders Meeting to be held virtually on March 6, 2023. As a shareholder, it is important for you to vote! On the back of this notice, you will find a summary of the proposals that require a shareholder vote at the Meeting. This communication is NOT a form for voting and presents only an overview of the more complete proxy materials that are available to you on the Internet or by mail. We encourage you to access and review all of the important information contained in the proxy materials before voting. The Joint Proxy Statement for the Meeting and Form of Proxy are available at: https://www.proxy-direct.com/dnp-33055 If you want to receive a paper copy of the documents or an email with a link to the documents, you must request them. There is no charge to you for requesting a copy. Paper materials will be mailed to the address on file within 3-business days of receipt of the request. Please make your request as soon as possible, but no later than February 23, 2023, to facilitate timely delivery. The Meeting of Shareholders of DNP Select Income Fund Inc. will be held virtually at the following website: meetnow.global/MWCCUZ6 on March 6, 2023, at 1:00 p.m., Eastern Time. To participate in the Virtual Meeting enter the 14-digit control number from the shaded box on this notice. ACCESS MATERIALS AND VOTE OR REQUEST PAPER DELIVERY OF MATERIALS EASY ONLINE ACCESS – REQUEST BY INTERNET Log on to the Internet and go to: https://www.proxy-direct.com/dnp-33055 On this site you can view the Proxy Statement and Form of Proxy online, request paper copies, request an email with a link to the materials and/or set future delivery preferences. Just follow the steps outlined on this secure website. TELEPHONE REQUESTS - CALL 1-877-816-5331 Obtain paper copies of the Proxy Statement and/or Form of Proxy with an option to set future delivery preference by touch tone phone. Call toll free from the U.S. or Canada at NO CHARGE to you. Follow the instructions provided in the recorded messages. E-MAIL REQUEST AT: proxymaterials@computershare.com: Email us to request Proxy Materials for the shareholder meeting and/or to set future delivery preferences. - Provide only your 14-Digit Control Number and 8-Digit Security Code as listed on this notice in your email request for materials. - If you want to elect to receive all future proxy materials in paper form or via email, please note your request and for email, provide the address. PAPER COPY REQUESTS SHOULD BE MADE NO LATER THAN FEBRUARY 23, 2023, TO FACILITATE TIMELY DELIVERY. ONLINE MATERIAL ACCESS AND PAPER COPY REQUESTS CAN BE MADE UTILIZING ONE OF THE THREE METHODS BELOW. YOU CAN ALSO USE ONE OF THESE THREE METHODS TO ELECT A PERMANENT DELIVERY PREFERENCE FOR FUTURE MEETINGS. DNP_33055_NA_122722_Pref

Your Fund Holdings: FUND DNP SELECT INCOME FUND INC. The following matters will be considered at the Meeting: 1b.    Election of Director. The Board of Directors unanimously recommends that shareholders vote “FOR” the nominee to the Board of Directors identified in the Proxy Statement. Please refer to the Proxy Materials for further details on the proposal. Common Questions about Notice and Access Why am I receiving a Notice of Internet Availability instead of a Proxy card and Proxy statement? Your fund has elected to utilize a distribution model authorized by the Securities and Exchange Commission in 2007. This model, known as Notice and Access, allows mutual funds and public companies to send you a Notice instead of a full set of printed proxy materials. As a shareholder, you can select the means by which you access those proxy materials. You can view the materials electronically via the Internet, or request a full set of printed materials for this Shareholder Meeting and all future meetings, or you can make that choice on a case by case basis. How do I access the materials, set my preference for future shareholder meeting materials and record my vote? On the front side of this Notice are easy to follow instructions on how to access Proxy materials electronically or request a full set of printed materials. Once you are on the website or ordering on the phone, you can also make your selection for future meetings. When you are ready to vote, electronic voting is available by Internet or Touch Tone Phone by using the Control Number and Security Code on the front of this Notice. The Touch Tone voting phone number is different from the ordering phone number and is displayed on the website. If you want to vote via Mail, you will need to request a paper copy of the materials to receive a Proxy Card and Return Envelope. If I request printed proxy materials, how long will it take for me to receive them? The SEC rule requires that the materials be sent via first class mail within three business days of receipt of your request. DNP_33055_NA_122722_Pref YOUR VOTE IS IMPORTANT NO MATTER HOW MANY SHARES YOU OWN

PO Box 43131 Providence, RI 02940-3131 EVERY VOTE IS IMPORTANT EASY VOTING OPTIONS: Please detach at perforation before mailing. PROXY DNP SELECT INCOME FUND INC. JOINT ANNUAL MEETING OF SHAREHOLDERS TO BE HELD ON MARCH 6, 2023 PREFERRED STOCK PROXY SOLICITED BY MANAGEMENT FROM PREFERRED SHAREHOLDERS. VOTE ON THE INTERNET Log on to: www.proxy-direct.com or scan the QR code Follow the on-screen instructions available 24 hours VOTE BY PHONE Call 1-800-337-3503 Follow the recorded instructions available 24 hours VOTE BY MAIL Vote, sign and date this Proxy Card and return in the postage-paid envelope VOTE AT THE VIRTUAL MEETING at the following Website: meetnow.global/MWCCUZ6 on March 6, 2023 at 1:00 p.m., Eastern Time. To Participate in the Virtual Meeting, enter the 14-digit control number from the shaded box on this card. Jennifer S. Fromm, Kathleen L. Hegyi, Alan M. Meder, and Daniel J. Petrisko or any of them, each with full power of substitution, are authorized to vote all shares of preferred stock of DNP Select Income Fund Inc. (the “Fund”) owned by the undersigned at the Joint Annual Meeting of Shareholders to be held virtually at the following Website: meetnow.global/MWCCUZ6 March 6, 2023, at 1:00 p.m., Eastern Time, and at any adjournment of the meeting. To participate in the Virtual Meeting enter the 14-digit control number from the shaded box on this card. They shall vote in accordance with the instructions set forth on the reverse side hereof. VOTE VIA THE INTERNET: www.proxy-direct.com VOTE VIA THE TELEPHONE: 1-800-337-3503 To change the address on your account, please check the box at right and indicate your new address in the address space below. Please note that changes to the registered name(s) on the account may not be submitted via this method. :=¨ DNP_33055_121922_Pref PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY PROMPTLY USING THE ENCLOSED ENVELOPE. xxxxxxxxxxxxxx code

EVERY SHAREHOLDER’S VOTE IS IMPORTANT We encourage you to take advantage of Internet or telephone voting. Both are available 24 hours a day, 7 days a week. Important Notice Regarding the Availability of Proxy Materials for the Joint Annual Meeting of Shareholders to Be Held on March 6, 2023. The Notice of Meeting, Joint Proxy Statement and Proxy Card are available at: https://www.proxy-direct.com/dnp-33055 Please detach at perforation before mailing. If no specific instructions are provided, this proxy will be voted “FOR” the election of the director and in the discretion of the proxies upon such other business as may properly come before the meeting. TO VOTE MARK BLOCKS BELOW IN BLUE OR BLACK INK AS SHOWN IN THIS EXAMPLE: X A Proposal The Board of Directors recommends a vote “FOR” the nominee listed. 1b. Election of Director: FOR WITHHOLD 01. Geraldine M. McNamara B Authorized Signatures — This section must be completed for your vote to be counted — Sign and Date Below Note: Please sign exactly as your name(s) appear(s) on this Proxy Card, and date it. When shares are held jointly, each holder should sign. When signing as attorney, executor, guardian, administrator, trustee, officer of corporation or other entity or in another representative capacity, please give the full title under the signature. Date (mm/dd/yyyy) — Please print date below Signature 1 — Please keep signature within the box Signature 2 — Please keep signature within the box Scanner bar code xxxxxxxxxxxxxx DNP2 33055 xxxxxxxx 

EVERY VOTE IS IMPORTANT
VOTE ON THE INTERNET Log on to: www.proxy-direct.com or scan the QR code Follow the on-screen instructions available 24 hours VOTE BY PHONE Call 1-800-337-3503 Follow the recorded instructions available 24 hours VOTE BY MAIL Vote, sign and date this Proxy Card and return in the postage-paid envelope VOTE AT THE VIRTUAL MEETING at the following Website: meetnow.global/MWCCUZ6 on March 6, 2023 at 1:00 p.m., Eastern Time. To Participate in the Virtual Meeting, enter the 14-digit control number from the shaded box on this card. PO Box 43131 Providence, RI 02940-3131 EASY VOTING OPTIONS: Please detach at perforation before mailing. PROXY DUFF & PHELPS UTILITY AND INFRASTRUCTURE FUND INC. JOINT ANNUAL MEETING OF SHAREHOLDERS TO BE HELD ON MARCH 6, 2023 COMMON STOCK PROXY SOLICITED BY MANAGEMENT FROM COMMON SHAREHOLDERS. Jennifer S. Fromm, Kathleen L. Hegyi, Alan M. Meder, and Daniel J. Petrisko or any of them, each with full power of substitution, are authorized to vote all shares of common stock of Duff & Phelps Utility and Infrastructure Fund Inc. (the “Fund”) owned by the undersigned at the Joint Annual Meeting of Shareholders to be held virtually at the following Website: meetnow.global/MWCCUZ6 March 6, 2023, at 1:00 p.m., Eastern Time, and at any adjournment of the meeting. To participate in the Virtual Meeting enter the 14-digit control number from the shaded box on this card. They shall vote in accordance with the instructions set forth on the reverse side hereof. VOTE VIA THE INTERNET: www.proxy-direct.com VOTE VIA THE TELEPHONE: 1-800-337-3503 To change the address on your account, please check the box at right and indicate your new address in the address space below. Please note that changes to the registered name(s) on the account may not be submitted via this method.    ☐ DPG_33054_122722 PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY PROMPTLY USING THE ENCLOSED ENVELOPE. xxxxxxxxxxxxxx                code

EVERY SHAREHOLDER’S VOTE IS IMPORTANT We encourage you to take advantage of Internet or telephone voting. Both are available 24 hours a day, 7 days a week. Important Notice Regarding the Availability of Proxy Materials for the Joint Annual Meeting of Shareholders to Be Held on March 6, 2023. The Notice of Meeting, Joint Proxy Statement and Proxy Card are available at: https://www.proxy-direct.com/dpg-33054 Please detach at perforation before mailing. If no specific instructions are provided, this proxy will be voted “FOR” the election of the directors and in the discretion of the proxies upon such other business as may properly come before the meeting. TO VOTE MARK BLOCKS BELOW IN BLUE OR BLACK INK AS SHOWN IN THIS EXAMPLE:    X A Proposal    The Board of Directors recommends a vote “FOR” the nominees listed. 1c. Election of Directors: FOR                WITHHOLD 01.    Mareilé B. Cusack ☐ ☐ 02. David J. Vitale☐ ☐ B Authorized Signatures — This section must be completed for your vote to be counted — Sign and Date Below Note: Please sign exactly as your name(s) appear(s) on this Proxy Card, and date it. When shares are held jointly, each holder should sign. When signing as attorney, executor, guardian, administrator, trustee, officer of corporation or other entity or in another representative capacity, please give the full title under the signature. Date (mm/dd/yyyy) — Please print date below    Signature 1 — Please keep signature within the box Signature 2 — Please keep signature within the box Scanner bar code     xxxxxxxxxxxxxx                DPG1 33054                xxxxxxxx 

EVERY VOTE IS IMPORTANT PO Box 43131 Providence, RI 02940-3131 EASY VOTING OPTIONS: VOTE ON THE INTERNET Log on to: www.proxy-direct.com or scan the QR code Follow the on-screen instructions available 24 hours VOTE BY PHONE Call 1-800-337-3503 Follow the recorded instructions available 24 hours VOTE BY MAIL Vote, sign and date this Proxy Card and return in the postage-paid envelope VOTE AT THE VIRTUAL MEETING at the following Website: meetnow.global/MWCCUZ6 on March 6, 2023 at 1:00 p.m., Eastern Time. To Participate in the Virtual Meeting, enter the 14-digit control number from the shaded box on this card. Please detach at perforation before mailing. PROXY DUFF & PHELPS UTILITY AND INFRASTRUCTURE FUND INC. JOINT ANNUAL MEETING OF SHAREHOLDERS TO BE HELD ON MARCH 6, 2023 PREFERRED STOCK PROXY SOLICITED BY MANAGEMENT FROM PREFERRED SHAREHOLDERS. Jennifer S. Fromm, Kathleen L. Hegyi, Alan M. Meder, and Daniel J. Petrisko or any of them, each with full power of substitution, are authorized to vote all shares of preferred stock of Duff & Phelps Utility and Infrastructure Fund Inc. (the “Fund”) owned by the undersigned at the Joint Annual Meeting of Shareholders to be held virtually at the following Website: meetnow.global/MWCCUZ6 March 6, 2023, at 1:00 p.m., Eastern Time, and at any adjournment of the meeting. To participate in the Virtual Meeting enter the 14-digit control number from the shaded box on this card. They shall vote in accordance with the instructions set forth on the reverse side hereof. VOTE VIA THE INTERNET: www.proxy-direct.com VOTE VIA THE TELEPHONE: 1-800-337-3503 To change the address on your account, please check the box at right and indicate your new address in the address space below. Please note that changes to the registered name(s) on the account may not be submitted via this method.    ☐ DPG_33054_122722_Pref PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY PROMPTLY USING THE ENCLOSED ENVELOPE. xxxxxxxxxxxxxx                code

EVERY SHAREHOLDER’S VOTE IS IMPORTANT We encourage you to take advantage of Internet or telephone voting. Both are available 24 hours a day, 7 days a week. Important Notice Regarding the Availability of Proxy Materials for the Joint Annual Meeting of Shareholders to Be Held on March 6, 2023. The Notice of Meeting, Joint Proxy Statement and Proxy Card are available at: https://www.proxy-direct.com/dpg-33054 Please detach at perforation before mailing. If no specific instructions are provided, this proxy will be voted “FOR” the election of the directors and in the discretion of the proxies upon such other business as may properly come before the meeting. TO VOTE MARK BLOCKS BELOW IN BLUE OR BLACK INK AS SHOWN IN THIS EXAMPLE:    X A Proposals    The Board of Directors recommends a vote “FOR” the nominees listed. 1c. Election of Directors: FOR WITHHOLD 01. Mareilé B. Cusack 02. David J. Vitale 1d. Election of Director: FOR WITHHOLD 01. Geraldine M. McNamara B Authorized Signatures — This section must be completed for your vote to be counted — Sign and Date Below Note: Please sign exactly as your name(s) appear(s) on this Proxy Card, and date it. When shares are held jointly, each holder should sign. When signing as attorney, executor, guardian, administrator, trustee, officer of corporation or other entity or in another representative capacity, please give the full title under the signature. Date (mm/dd/yyyy) — Please print date below    Signature 1 — Please keep signature within the box Signature 2 — Please keep signature within the box Scanner bar code     xxxxxxxxxxxxxx                 DPG2 33054                xxxxxxxx 

DTF Important TAX-FREE Notice of Availability INCOME of Proxy Materials 2028 for TERM the Shareholder FUND Meeting INC. of To Be Held Virtually On March 6, 2023 at 1:00 p.m., Eastern Time at the following website: https://meetnow.global/MWCCUZ6 ACCOUNT NUMBER CONTROL NUMBER COMPANY NUMBER This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. If you want to receive a paper or e-mail copy of the proxy materials you must request one. There is no charge to you for requesting a copy. To facilitate timely delivery please make the request as instructed below before 02/24/23. Please visit http://www.astproxyportal.com/ast/14676, where the following materials are available for view: • Notice of Annual Meeting of Stockholders • Proxy Statement • Form of Electronic Proxy Card TO REQUEST MATERIAL: TELEPHONE: 888-Proxy-NA (888-776-9962) 718-921-8562 (for international callers) E-MAIL: info@astfinancial.com WEBSITE: https://us.astfinancial.com/OnlineProxyVoting/ProxyVoting/RequestMaterials TO VOTE: ONLINE: To access your online proxy card, please visit www.voteproxy.com and follow the on-screen instructions or scan the QR code with your smartphone. You may enter your voting instructions at www.voteproxy.com up until 11:59 PM Eastern Time the day before the cut-off or meeting date. AT THE VIRTUAL MEETING: You may vote your shares at the following website: https://meetnow.global/MWCCUZ6 TELEPHONE: To vote by telephone, please visit www.voteproxy.com to view the materials and to obtain the toll free number to call. MAIL: You may request a card by following the instructions above. 1e. Election of Directors: NOMINEES: Mareilé B. Cusack David J. Vitale Please note that you cannot use this notice to vote.

ANNUAL MEETING OF SHAREHOLDERS OF DTF TAX-FREE INCOME 2028 TERM FUND INC. March 6, 2023 NOTICE OF INTERNET AVAILABILITY OF PROXY MATERIAL: The Notice of Meeting, proxy statement and proxy card are available at http://www.astproxyportal.com/ast/14676 Please sign, date and mail your proxy card in the envelope provided as soon as possible. Please detach along perforated line and mail in the envelope provided. 20200000000000000000 6 030623 THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” THE ELECTION OF DIRECTOR. PLEASE SIGN, DATE AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE X NOMINEES: FOR ALL NOMINEES O O Mareilé B. Cusack David J. Vitale WITHHOLD FOR ALL NOMINEES AUTHORITY FOR (See instructions below) ALL EXCEPT 2. Transact such other business as may properly come before the meeting, or any adjournment or postponement thereof. Shareholders of record at the close of business on December 9, 2022 are entitled to vote at the meeting. The undersigned hereby acknowledges receipt of the accompanying Notice of Joint Annual Meeting and Joint Proxy Statement for the Annual Meeting to be held on March 6, 2023. INSTRUCTIONS: To withhold authority to vote for any individual nominee(s), mark “FOR ALL EXCEPT” and fill in the circle next to each nominee you wish to withhold, as shown here: TO INCLUDE ANY COMMENTS, USE THE COMMENTS BOX ON THE REVERSE SIDE OF THIS CARD. To change the address on your account, please check the box at right and indicate your new address in the address space above. Please note that changes to the registered name(s) on the account may not be submitted via this method. Signature of Shareholder Date: Signature of Shareholder Date: Note: Please sign exactly as your name or names appear on this Proxy. When shares are held jointly, each holder should sign. When signing as executor, administrator, attorney, trustee or guardian, please give full title as such. If the signer is a corporation, please sign full corporate name by duly authorized officer, giving full title as such. If signer is a partnership, please sign in partnership name by authorized person.

ANNUAL MEETING OF SHAREHOLDERS OF DTF TAX-FREE INCOME 2028 TERM FUND INC. March 6, 2023 PROXY VOTING INSTRUCTIONS INTERNET - Access “www.voteproxy.com” and follow the on-screen instructions or scan the QR code with your smartphone. Have your proxy card available when you access the web page, and use the Company Number and Account Number shown on your proxy card. TELEPHONE - Call toll-free 1-800-PROXIES (1-800-776-9437) in the United States or 1-718-921-8500 from foreign countries from any touch-tone telephone and follow the instructions. Have your proxy card available when you call and use the Company Number and Account Number shown on your proxy card. Vote online/phone until 11:59 PM EST the day before the meeting. MAIL - Sign, date and mail your proxy card in the envelope provided as soon as possible. AT THE VIRTUAL MEETING - You may vote your shares at the following website: https://meetnow.global/MWCCUZ6 COMPANY NUMBER ACCOUNT NUMBER NOTICE OF INTERNET AVAILABILITY OF PROXY MATERIAL: The Notice of Meeting, proxy statement and proxy card are available at http://www.astproxyportal.com/ast/14676 Please detach along perforated line and mail in the envelope provided IF you are not voting via telephone or the Internet. 20200000000000000000 6 030623 THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” THE ELECTION OF DIRECTOR. PLEASE SIGN, DATE AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE 1e. Election of Directors: O Mareilé B. Cusack O David J. Vitale 2. Transact such other business as may properly come before the meeting, or any adjournment or postponement thereof. Shareholders of record at the close of business on December 9, 2022 are entitled to vote at the meeting. The undersigned hereby acknowledges receipt of the accompanying Notice of Joint Annual Meeting and Joint Proxy Statement for the Annual Meeting to be held on March 6, 2023. NOMINEES: TO INCLUDE ANY COMMENTS, USE THE COMMENTS BOX ON THE REVERSE SIDE OF THIS CARD. FOR ALL NOMINEES WITHHOLD AUTHORITY FOR ALL NOMINEES FOR ALL EXCEPT (See instructions below) INSTRUCTIONS: To withhold authority to vote for any individual nominee(s), mark “FOR ALL EXCEPT” and fill in the circle next to each nominee you wish to withhold, as shown here: To change the address on your account, please check the box at right and indicate your new address in the address space above. Please note that changes to the registered name(s) on the account may not be submitted via this method. Signature of Shareholder Date: Signature of Shareholder Date: Note: Please sign exactly as your name or names appear on this Proxy. When shares are held jointly, each holder should sign. When signing as executor, administrator, attorney, trustee or guardian, please give full title as such. If the signer is a corporation, please sign full corporate name by duly authorized officer, giving full title as such. If signer is a partnership, please sign in partnership name by authorized person.

DTF TAX-FREE INCOME 2028 TERM FUND INC. 1 PROXY SOLICITED BY MANAGEMENT FROM COMMON SHAREHOLDERS FOR MEETING TO BE HELD ON MARCH 6, 2023 Jennifer S. Fromm, Kathleen L. Hegyi, Alan M. Meder and Daniel J. Petrisko or any of them, each with full power of substitution, are authorized to vote all shares of common stock of DTF Tax-Free Income 2028 Term Fund Inc. owned by the undersigned at the meeting of shareholders to be held March 6, 2023, and at any adjournment of the meeting. They shall vote in accordance with the instructions set forth on the reverse side hereof. If no specific instructions are provided, this proxy will be voted “FOR” the election of the director and in the discretion of the proxies upon such other business as may properly come before the meeting. (Continued and to be signed and dated on the reverse side.) COMMENTS: 1.1 14475

DUFF & PHELPS DTF TAX-FREE INCOME 2028 TERM FUND INC. PO Box 43131 Providence, RI 02940-3131 IMPORTANT PROXY INFORMATION Your Vote Counts! PLEASE USE THE 14-DIGIT CONTROL NUMBER & 8-DIGIT SECURITY CODE LISTED IN THE BOXES BELOW WHEN REQUESTING MATERIAL VIA THE TELEPHONE & INTERNET. When you are ready to vote, you can use the same Control Number & Security Code to record your vote. Shareholder Meeting Notice - THIS IS NOT A PROXY - Please read carefully for voting instructions. Important Notice Regarding the Availability of Proxy Materials for the DTF Tax-Free Income 2028 Term Fund Inc. Shareholders Meeting to be held virtually on March 6, 2023. As a shareholder, it is important for you to vote! On the back of this notice, you will find a summary of the proposals that require a shareholder vote at the Meeting. This communication is NOT a form for voting and presents only an overview of the more complete proxy materials that are available to you on the Internet or by mail. We encourage you to access and review all of the important information contained in the proxy materials before voting. The Joint Proxy Statement for the Meeting and Form of Proxy are available at: https://www.proxy-direct.com/dnp-33055 If you want to receive a paper copy of the documents or an email with a link to the documents, you must request them. There is no charge to you for requesting a copy. Paper materials will be mailed to the address on file within 3-business days of receipt of the request. Please make your request as soon as possible, but no later than February 23, 2023, to facilitate timely delivery. The Meeting of Shareholders of DTF Tax-Free Income 2028 Term Fund Inc. will be held virtually at the following website: meetnow.global/MWCCUZ6 on March 6, 2023, at 1:00 p.m., Eastern Time. To participate in the Virtual Meeting enter the 14-digit control number from the shaded box on this notice. ONLINE MATERIAL ACCESS AND PAPER COPY REQUESTS CAN BE MADE UTILIZING ONE OF THE THREE METHODS BELOW. YOU CAN ALSO USE ONE OF THESE THREE METHODS TO ELECT A PERMANENT DELIVERY PREFERENCE FOR FUTURE MEETINGS. ACCESS MATERIALS AND VOTE OR REQUEST PAPER DELIVERY OF MATERIALS EASY ONLINE ACCESS - REQUEST BY INTERNET Log on to the Internet and go to: https://www.proxy-direct.com/dnp-33055 On this site you can view the Proxy Statement and Form of Proxy online, request paper copies, request an email with a link to the materials and/or set future delivery preferences. Just follow the steps outlined on this secure website. TELEPHONE REQUESTS - CALL 1-877-816-5331 Obtain paper copies of the Proxy Statement and/or Form of Proxy with an option to set future delivery preference by touch tone phone. Call toll free from the U.S. or Canada at NO CHARGE to you. Follow the instructions provided in the recorded messages. E-MAIL REQUEST AT: proxymaterials@computershare.com: Email us to request Proxy Materials for the shareholder meeting and/or to set future delivery preferences. - Provide only your 14-Digit Control Number and 8-Digit Security Code as listed on this notice in your email request for materials. - If you want to elect to receive all future proxy materials in paper form or via email, please note your request and for email, provide the address. PAPER COPY REQUESTS SHOULD BE MADE NO LATER THAN FEBRUARY 23, 2023, TO FACILITATE TIMELY DELIVERY. DTF_33055_NA_122722_Pref

Your Fund Holdings: FUND DTF TAX-FREE INCOME 2028 TERM FUND INC. The following matters will be considered at the Meeting: 1e. Election of Directors. 1f. Election of Director. The Board of Directors unanimously recommends that shareholders vote “FOR” the nominees to the Board of Directors identified in the Proxy Statement. Please refer to the Proxy Materials for further details on the proposal. YOUR VOTE IS IMPORTANT NO MATTER HOW MANY SHARES YOU OWN Common Questions about Notice and Access Why am I receiving a Notice of Internet Availability instead of a Proxy card and Proxy statement? Your fund has elected to utilize a distribution model authorized by the Securities and Exchange Commission in 2007. This model, known as Notice and Access, allows mutual funds and public companies to send you a Notice instead of a full set of printed proxy materials. As a shareholder, you can select the means by which you access those proxy materials. You can view the materials electronically via the Internet, or request a full set of printed materials for this Shareholder Meeting and all future meetings, or you can make that choice on a case by case basis. How do I access the materials, set my preference for future shareholder meeting materials and record my vote? On the front side of this Notice are easy to follow instructions on how to access Proxy materials electronically or request a full set of printed materials. Once you are on the website or ordering on the phone, you can also make your selection for future meetings. When you are ready to vote, electronic voting is available by Internet or Touch Tone Phone by using the Control Number and Security Code on the front of this Notice. The Touch Tone voting phone number is different from the ordering phone number and is displayed on the website. If you want to vote via Mail, you will need to request a paper copy of the materials to receive a Proxy Card and Return Envelope. If I request printed proxy materials, how long will it take for me to receive them? The SEC rule requires that the materials be sent via first class mail within three business days of receipt of your request. DTF_33055_N A_122722_Pref

DUFF & PHELPS DTF TAX-FREE INCOME 2028 TERM FUND INC. PO BOX 43131 Providence, RI 02940-3131 EVERY VOTE IS IMPORTANT EASY VOTING OPTIONS: VOTE ON Log THE on INTERNET to: www. or scan proxy-direct. the QR code com Follow the available on-screen 24 hours instructions Call VOTE 1-800-337-3503 BY PHONE Follow available the recorded 24 hours instructions Vote, sign VOTE and BY date MAIL this Proxy postage-paid Card and return envelope in the VOTE at AT the THE following VIRTUAL Website: MEETING meetnow.global/MWCCUZ6 on March 6, 2023 at To Participate 1:00 p.m. in Eastern the Virtual Time. Meeting, enter the the shaded 14-digit box control on this number card. from PROXY Please detach at perforation before mailing. DTF TAX-FREE INCOME 2028 TERM FUND INC. JOINT ANNUAL MEETING OF SHAREHOLDERS TO BE HELD ON MARCH 6, 2023 PREFERRED STOCK PROXY any of them, SOLICITED each with BY full MANAGEMENT power of substitution, FROM PREFERRED are authorized SHAREHOLDERS to vote all shares . Jennifer of preferred S. Fromm, stock of Kathleen DTF Tax L.- Free Hegyi, Income Alan M. Meder, 2028 Term and Fund Daniel Inc. J. Petrisko (the “Fund”) or 1:00 owned p.m., by the Eastern undersigned Time, and at at the any Joint adjournment Annual Meeting of the of meeting Shareholders . To participate to be held in virtually the Virtual at the Meeting following enter Website: the 14-digit meetnow.global/MWCCUZ6 number from the shaded March 6, 2023, on this at card. They shall vote in accordance with the instructions set forth on the reverse side hereof. control box VOTE VIA THE INTERNET: www.proxy-direct.com VOTE VIA THE TELEPHONE: 1-800-337-3503 To and change indicate the your address new address on your account, in the address please space check below the box . Please at right note be submitted that changes via this to method the registered . name(s) on the account may not DTF_33055_122722_Pref PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY PROMPTLY USING THE ENCLOSED ENVELOPE. xxxxxxxxxxxxxx code

EVERY SHAREHOLDER’S VOTE IS IMPORTANT We encourage you to take advantage of Internet or telephone voting. Both are available 24 hours a day, 7 days a week. Important Notice Regarding the Availability of Proxy Materials for the Joint Annual Meeting of Shareholders to Be Held on March 6, 2023. The Notice of Meeting, Joint Proxy Statement and Proxy Card are available at: https://www.proxy-direct.com/dnp-33055 Please detach at perforation before mailing. If no specific instructions are provided, this proxy will be voted “FOR” the election of the directors and in the discretion of the proxies upon such other business as may properly come before the meeting. TO VOTE MARK BLOCKS BELOW IN BLUE OR BLACK INK AS SHOWN IN THIS EXAMPLE: X Proposal The Board of Directors recommends a vote “FOR” the nominees listed. 1e. Election of Directors: FOR WITHHOLD 01. Mareilé B. Cusack 02. David J. Vitale 1f. Election of Director: FOR WITHHOLD 01. Geraldine M. McNamara Authorized Signatures — This section must be completed for your vote to be counted — Sign and Date Below Note: Please sign exactly as your name(s) appear(s) on this Proxy Card, and date it. When shares are held jointly, each holder should sign. When signing as attorney, executor, guardian, administrator, trustee, officer of corporation or other entity or in another representative capacity, please give the full title under the signature. Date (mm/dd/yyyy) — Please print date below Signature 1 — Please keep signature within the box Signature 2 — Please keep signature within the box Scanner bar code xxxxxxxxxxxxxx DTF2 33055 xxxxxxxx