SCHEDULE 14A INFORMATION

                    PROXY STATEMENT PURSUANT TO SECTION 14(a)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                                (Amendment No. )
                             Filed by the Registrant / X /

                   Filed by a party other than the Registrant          /    /

Check the appropriate box:

/X/   Preliminary Proxy Statement

/ /   Confidential, for Use of the Commission Only (as permitted by Rule
      14a-6(e) (2))

/ /   Definitive Proxy Statement

/ /   Definitive Additional Materials

/ /   Soliciting Material Pursuant to Sec. 240.14a-11(c) or Sec. 240.14a-12


                       PUTNAM MASTER INCOME TRUST
            (Name of Registrant as Specified In Its Charter)

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

Payment of Filing Fee (Check the appropriate box):

/X/   No fee required

/ /   Fee computed on table below per Exchange Act Rule 14a 6(i)(1) and 0-11



      (1) Title of each class of securities to which transaction applies:

      (2) Aggregate number of securities to which transaction applies:

      (3) Per unit price or other underlying value of transaction computed
          pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
          filing fee is calculated and state how it was determined):

      (4) Proposed maximum aggregate value of transaction:

      (5) Total fee paid:

/ /   Fee paid previously with preliminary materials.

/ /   Check box if any part of the fee is offset as provided by Exchange
          Act Rule 0-11(a)(2) and identify the filing for which the offsetting
          fee was paid previously. Identify the previous filing by registration
          statement number, or the Form or Schedule and the date of its filing.

      (1) Amount Previously Paid:

      (2) Form, Schedule or Registration Statement No.:

      (3) Filing Party:

      (4) Date Filed:




IMPORTANT INFORMATION
FOR SHAREHOLDERS IN
PUTNAM MASTER INCOME TRUST


     The document you hold in your hands contains your proxy statement and proxy
     card. A proxy card is, in essence, a ballot. When you vote your proxy, it
     tells us how to vote on your behalf on important issues relating to your
     fund. If you complete and sign the proxy, we'll vote it exactly as you tell
     us. If you simply sign the proxy, we'll vote it in accordance with the
     Trustees' recommendations on page 4.

     We urge you to spend a couple of minutes with the proxy statement, and
     either fill out your proxy card and return it to us via the mail, or record
     your voting instructions via the Internet. When shareholders don't return
     their proxies in sufficient numbers, we have to incur the expense of
     follow-up solicitations, which can cost your fund money.

     We want to know how you would like to vote and welcome your comments.
     Please take a few moments with these materials and return your proxy to us.


                                 [scale logo]



Table of contents


                                                                         
A Message from the Chairman................................................ (1)

Notice of Shareholder Meeting.............................................. (3)

Trustees' Recommendations.................................................. (4)

Proxy card enclosed







If you have any questions, please contact us at the special toll-free number we
have set up for you (1-800-225-1581) or call your financial advisor.

- - -----------------------------------------------


A Message from the Chairman



[Photo of John A. Hill]

Dear Shareholder:

I am writing to you to ask for your vote on important questions that affect your
investment in your fund. While you are, of course, welcome to join us at your
fund's meeting, most shareholders cast their vote by either filling out and
signing the enclosed proxy card or by voting via the Internet. Instructions are
listed at the top of your proxy card. We are asking for your vote on the
following matters: (1) fixing the number of Trustees and electing your fund's
Trustees; (2) ratifying the selection of your fund's independent auditors; and
(3) converting your fund from a closed-end fund to an open-end fund.

Your Trustees unanimously recommend that shareholders vote "For" the first two
proposals. On the third proposal, whether to convert Putnam Master Income Trust
to an open-end fund, the Trustees, including the Trustees who are not affiliated
with the fund's manager, unanimously recommend that shareholders vote "Against"
the conversion. The third proposal is on the agenda as a result of provisions in
your fund's governing legal documents that require that shareholders be given
the opportunity to consider a conversion in the event the fund's shares trade at
a discount from net asset value greater than 10% over a specified period of
time.

The Trustees believe that remaining a closed-end fund provides significant
investment benefits that are not available to open-end funds. In general, if the
fund remains a closed-end fund, the portfolio manager can continue to manage the
fund with a steadier, longer term perspective without the short-term pressures
from sales and redemptions of fund shares typically experienced by open-end
funds. Under some circumstances this flexibility can allow a closed-end fund to
out-perform an open-end fund with a similar investment strategy. In addition, a
conversion to open-end status, while ending the discount, is likely to result in
a lower yield because of increased fund expenses. This result would be
inconsistent with the fund's investment objective of seeking high current income
consistent with preservation of capital.


                                        (1)



Despite the advantages of maintaining your fund's closed-end status, you would
receive a short-term benefit if the fund were converted to open-end status. As
of July 3, 2000 shares of your fund were traded at a 12.55% discount to their
net asset value. Upon conversion of the fund, your shares would be redeemable at
their net asset value with no discount subject to the imposition by the Trustees
of a redemption fee payable to the fund. Of course, the size of the discount
fluctuates, and may be greater or less than 12.55% at the time any conversion
goes into effect. While it may appear that your shares of the fund would
increase in value by 14% upon conversion, transaction costs involved with
selling a portion of your fund's portfolio would reduce this gain.

The Trustees do not believe that the current level of discounts justifies the
fundamental changes that would result from conversion, and are therefore
recommending that you vote against the conversion.

Although we would like very much to have you attend your fund's meeting, we
realize this may not be possible. Whether or not you plan to be present, we need
your vote. We urge you to record your voting instructions on the Internet or
complete, sign, and return the enclosed proxy card promptly. A postage-paid
envelope is enclosed.

I'm sure that you, like most people, lead a busy life and are tempted to put
this proxy aside for another day. Please don't. When shareholders do not return
their proxies, your fund may have to incur the expense of follow-up
solicitations. All shareholders benefit from the speedy return of proxies.

Your vote is important to us. We appreciate the time and consideration that I am
sure you will give this important matter. If you have questions about the
proposals, contact your financial adviser or call a Putnam customer service
representative at 1-800-225-1581.

                                         Sincerely yours,

                                         /s/ John A. Hill
                                         -------------------------------

                                         John A. Hill, Chairman


                                        (2)



PUTNAM MASTER INCOME TRUST
Notice of Annual Meeting of Shareholders

>  This is the formal agenda for your fund's shareholder meeting. It tells you
   what matters will be voted on and the time and place of the meeting, if you
   can attend in person.

   To the Shareholders of Putnam Master Income Trust:

   The Annual Meeting of Shareholders of your fund will be held on October 5,
   2000 at 2:00 p.m., Boston time, on the eighth floor of One Post Office
   Square, Boston, Massachusetts, to consider the following:

1. Fixing the number of Trustees and electing Trustees. See page 6.

2. Ratifying the selection by the Trustees of the independent auditors of
   your fund for its current fiscal year. See page 21.

3. Approving or disapproving the conversion of your fund from closed-end to
   open-end status and the authorization of related amendments to your fund's
   Agreement and Declaration of Trust. See page 22.

   By the Trustees
   John A. Hill, Chairman
   George Putnam, III, President


                         
   Jameson A. Baxter        John H. Mullin, III
   Hans H. Estin            Robert E. Patterson
   Ronald J. Jackson        A.J.C. Smith
   Paul L. Joskow           W. Thomas Stephens
   Elizabeth T. Kennan      W. Nicholas Thorndike
   Lawrence J. Lasser


   WE URGE YOU TO MARK, SIGN, DATE, AND MAIL THE ENCLOSED PROXY IN THE
   POSTAGE-PAID ENVELOPE PROVIDED OR RECORD YOUR VOTING INSTRUCTIONS VIA THE
   INTERNET SO YOU WILL BE REPRESENTED AT THE MEETING.

   August 18, 2000

                                        (3)



Proxy Statement


>  This document will give you the information you need to vote on the matters
   listed on the previous page. Much of the information in the proxy statement
   is required under rules of the Securities and Exchange Commission ("SEC");
   some of it is technical. If there is anything you don't understand, please
   contact us at our special toll-free number, 1-800-225-1581, or call your
   financial advisor.

>  Who is asking for your vote?

   The enclosed proxy is solicited by the Trustees of Putnam Master Income Trust
   for use at the Annual Meeting of Shareholders of the fund to be held on
   October 5, 2000 and, if the fund's meeting is adjourned, at any later
   meetings, for the purposes stated in the Notice of Annual Meeting (see
   previous page).

>  How do your fund's Trustees recommend that shareholders vote on these
   proposals?

   The Trustees recommend that you vote

1. For fixing the number of Trustees as proposed and the election of all
   ___
   nominees;

2. For ratifying the selection of KPMG LLP as the independent auditors of
   ___
   your fund; and

3. Against converting your fund from closed-end to open-end status and
   _______
   authorizing certain related amendments to your fund's Agreement and
   Declaration of Trust.

                                        (4)



>  Who is eligible to vote?

   Shareholders of record at the close of business on July 14, 2000 are entitled
   to be present and to vote at the meeting or any adjourned meeting. The Notice
   of Meeting, the proxy, and the Proxy Statement are being mailed on or about
   August 21, 2000.

   Each share is entitled to one vote. Shares represented by duly executed
   proxies will be voted in accordance with your instructions. If you sign the
   proxy, but don't fill in a vote, your shares will be voted in accordance with
   the Trustees' recommendations. If any other business is brought before your
   fund's meeting, your shares will be voted at the Trustees' discretion.


                                        (5)



The Proposals
   Nominees for Trustees

1. ELECTION OF TRUSTEES

>  Who are the nominees for Trustees?

   The Board Policy and Nominating Committee of the Trustees of your fund
   recommends that the number of Trustees be fixed at 13 and that you vote for
   the election of the nominees described below. Each nominee is currently a
   Trustee of your fund and of the other Putnam funds.

   The Board Policy and Nominating Committee of the Trustees of your fund makes
   recommendations concerning the Trustees of your fund. The Board Policy and
   Nominating Committee consists solely of Trustees who are not "interested
   persons" (as defined in the Investment Company Act of 1940) of your fund or
   of Putnam Investment Management, Inc., your fund's investment manager
   ("Putnam Management").

>  Jameson Adkins Baxter

   [Photo of Jameson Adkins Baxter]

   Ms. Baxter, age 57, is the President of Baxter Associates, Inc., a management
   consulting and private investment firm that she founded in 1986. During that
   time, she was also a Vice President and Principal of the Regency Group, Inc.
   and a Consultant to First Boston Corporation, both of which are investment
   banking firms. From 1965 to 1986, Ms. Baxter held various positions in
   investment banking and corporate finance at First Boston.

   Ms. Baxter currently also serves as a Director of Banta Corporation, Ryerson
   Tull and ASHTA Chemicals, Inc. She is also the Chairman Emeritus of the Board
   of Trustees of Mount Holyoke College, having previously served as Chairman
   for five years and as a Board member for thirteen years; an Honorary Trustee
   and past President of the Board of Trustees of the Emma Willard School;
   Member of the Board of Governors of Good Shepherd Hospital; and Chair of the
   National Center for Non-profit Boards. Ms. Baxter is a graduate of Mount
   Holyoke College.

                                        (6)



Nominees for Trustees

>  Hans H. Estin

   [Photo of Hans H. Estin]


   Mr. Estin, age 72, is a Chartered Financial Analyst and the Vice Chairman of
   North American Management Corp., a registered investment advisor serving
   individual clients and their families. Mr. Estin currently also serves as a
   Corporation Member of The Schepens Eye Research Institute and as a Trustee of
   New England Aquarium. He previously served as the Chairman of the Board of
   Trustees of Boston University and is currently active in various other civic
   associations, including the Boys & Girls Clubs of Boston, Inc. Mr. Estin is a
   graduate of Harvard College and holds honorary doctorates from Merrimack
   College and Boston University.

>  John A. Hill

   [Photo of John A. Hill]

   Mr. Hill, age 57, is Chairman of the Trustees. He is the Vice-Chairman and
   Managing Director of First Reserve Corporation, a registered investment
   advisor investing in companies in the world-wide energy industry on behalf of
   institutional investors.

   Prior to acquiring First Reserve in 1983, Mr. Hill held executive positions
   with several investment advisory firms and held various positions with the
   Federal government, including Associate Director of the Office of Management
   and Budget and Deputy Administrator of the Federal Energy Administration.

   Mr. Hill currently also serves as a Director of Santa Fe Snyder Corporation,
   an exploration and production company, TransMontaingne Oil Company, a refined
   oil product pipeline and distribution company and various private companies
   controlled by First Reserve Corporation. He is also a Member of the Board of
   Advisors of Fund Directions. He is currently active in various business
   associations, including the

                                        (7)



Nominees for Trustees

   Economic Club of New York, and lectures on energy issues in the United States
   and Europe. Mr. Hill is a graduate of Southern Methodist University.

>  Ronald J. Jackson

   [Photo of Ronald J. Jackson]

   Mr. Jackson, age 55, retired as Chairman of the Board, President and Chief
   Executive Officer of Fisher-Price, Inc., a major toy manufacturer, in 1993, a
   position which he held since 1990. He previously served as President and
   Chief Executive Officer of Stride-Rite, Inc., a manufacturer and distributor
   of footwear, from 1989 to 1990, and as President and Chief Executive Officer
   of Kenner Parker Toys, Inc., a major toy and game manufacturer, from 1985 to
   1987. Prior to that, he held various financial and marketing positions at
   General Mills, Inc. from 1966 to 1985, including Vice President, Controller
   and Vice President of Marketing for Parker Brothers, a toy and game company,
   and President of Talbots, a retailer and direct marketer of women's apparel.
   Mr. Jackson is a graduate of Michigan State University Business School.

>  Paul L. Joskow*

   [Photo of Paul L. Joskow]

   Dr. Joskow, age 52, is Elizabeth and James Killian Professor of Economics and
   Director of the Center for Energy and Environmental Policy Research at the
   Massachusetts Institute of Technology. He has published five books and
   numerous articles on topics in industrial organization, government regulation
   of industry, and competition policy. Dr. Joskow currently serves as a
   Director of the New England Electric System, a public utility holding
   company, State Farm Indemnity Company, an automobile insurance company, and
   the Whitehead Institute for Biomedical Research, a non-profit research
   institution. He has been President of the Yale University Council since 1993.

                                        (8)



Nominees for Trustees

   Dr. Joskow is active on industry restructuring, environmental, energy,
   competition, and privatization policies and has served as an advisor to
   governments and corporations around the world.

   Dr. Joskow is a graduate of Cornell University and Yale University. He is a
   Fellow of the Econometric Society and the American Academy of Arts and
   Sciences.

>  Elizabeth T. Kennan

   [Photo of Elizabeth T. Kennan]

   Dr. Kennan, age 61, is President Emeritus of Mount Holyoke College. From 1978
   through June 1995, she was President of Mount Holyoke College. From 1966 to
   1978, she was on the faculty of Catholic University, where she taught
   history, published numerous articles, and directed the post-doctoral programs
   in Patristic and Medieval Studies.

   Dr. Kennan currently serves as a Director of Northeast Utilities, Talbots and
   Cambus-Kenneth Bloodstock, a corporation involved in thoroughbred horse
   breeding and farming. She is a Member of The Folger Shakespeare Library
   Committee and a Trustee of Franklin Pierce College. Dr. Kennan previously
   served as a Director of Bell Atlantic Corporation, Chastain Real Estate, and
   Kentucky Home Life Insurance. Active in various educational and civic
   associations, Dr. Kennan is a graduate of Mount Holyoke College, the
   University of Washington, and St. Hilda's College, Oxford University. She
   holds several honorary doctorates.

>  Lawrence J. Lasser*

   [Photo of Lawrence J. Lasser]

   Mr. Lasser, age 57, is a Vice President of your fund and each of the other
   Putnam funds. He has been the President, Chief Executive Officer and a
   Director of Putnam Investments, Inc. and Putnam Management since 1985, having
   begun his career there in 1969.


                                        (9)



Nominees for Trustees

   Mr. Lasser currently also serves as a Director of Marsh & McLennan Companies,
   Inc., the parent company of Putnam Management. He is a Member of the Board of
   Directors of the United Way of Massachusetts Bay, a Member of the Board of
   Governors of the Investment Company Institute, a Trustee of the Museum of
   Fine Arts, Boston, a Trustee and Member of the Finance and Executive
   Committees of the Beth Israel Deaconess Medical Center, Boston and a Member
   of the CareGroup Board of Managers Investment Committee, the Council on
   Foreign Relations, and the Commercial Club of Boston. Mr. Lasser is a
   graduate of Antioch College and Harvard Business School.

>  John H. Mullin, III

   [Photo of John H. Mullin, III]


   Mr. Mullin, age 58, is Chairman and CEO of Ridgeway Farm, a limited liability
   company engaged in timber activities and farming. Prior to establishing
   Ridgeway Farm in 1989, Mr. Mullin was a Managing Director of Dillon, Read &
   Co. Inc., an investment banking firm.

   Mr. Mullin currently serves as a Director of ACX Technologies, Inc., a
   company engaged in the manufacture of packaging products; Alex. Brown Realty,
   Inc., a real estate investment company; Carolina Power and Light, a public
   utility company; and The Liberty Corporation, a company engaged in the life
   insurance and broadcasting industries. Mr. Mullin previously served as a
   Director of Dillon, Read & Co. Inc., Adolph Coors Company, Crystal Brands,
   Inc., Fisher- Price, Inc., Mattel, Inc. and The Ryland Group, Inc. Mr. Mullin
   is a Trustee Emeritus of Washington & Lee University where he served as
   Chairman of the Investment Committee. Mr. Mullin is a graduate of Washington
   & Lee University and The Wharton Graduate School at the University of
   Pennsylvania.


                                       (10)



Nominees for Trustees

>  Robert E. Patterson

   [Photo of Robert E. Patterson]


   Mr. Patterson, age 54, is the President and a Trustee of Cabot Industrial
   Trust, a publicly traded real estate investment trust. Prior to February
   1998, he was Executive Vice President and Director of Acquisitions of Cabot
   Partners Limited Partnership, a registered investment advisor which managed
   real estate investments for institutional investors. Prior to 1990, he was
   the Executive Vice President of Cabot, Cabot & Forbes Realty Advisors, Inc.,
   the predecessor company of Cabot Partners. Prior to that, he was a Senior
   Vice President of the Beal Companies, a real estate management, investment
   and development company. He has also worked as an attorney and held various
   positions in state government, including the founding Executive Director of
   the Massachusetts Industrial Finance Agency.

   Mr. Patterson currently also serves as Chairman of the Joslin Diabetes
   Center, a Trustee of SEA Education Association and a Director of Brandywine
   Trust Company. Mr. Patterson is a graduate of Harvard College and Harvard Law
   School.


>  George Putnam, III*

   [Photo of George Putnam, III]

   Mr. Putnam, age 48, is the President of your Fund and each of the other
   Putnam Funds. He is also the President of New Generation Research, Inc., a
   publisher of financial advisory and other research services relating to
   bankrupt and distressed companies, and New Generation Advisers, Inc., a
   registered investment advisor which provides advice to private funds
   specializing in investments in such companies. Prior to founding New
   Generation in 1985, Mr. Putnam was an attorney with the Philadelphia law firm
   Dechert Price & Rhoads.

                                       (11)



Nominees for Trustees

   Mr. Putnam currently also serves as a Director of The Boston Family Office,
   L.L.C., a registered investment advisor that provides financial advice to
   individuals and families. He is also a Trustee of the SEA Education
   Association and St. Mark's School. Mr. Putnam is a graduate of Harvard
   College, Harvard Business School and Harvard Law School.

>  A.J.C. Smith*

   [Photo of A.J.C. Smith]

   Mr. Smith, age 65, is the Chairman of Marsh & McLennan Companies, Inc. From
   May 1992 to November 1999 he served as the Company's Chairman and Chief
   Executive Officer. He has been employed by Marsh & McLennan and related
   companies in various capacities since 1961. Mr. Smith is a Director of the
   Trident Corp.; a Trustee of the Carnegie Hall Society, the Central Park
   Conservancy, the Educational Broadcasting Corporation, the Economic Club of
   New York, and the U.S. Chamber of Commerce; a Member of the Board of
   Overseers of the Joan and Sanford I. Weill Graduate School of Medical
   Sciences of Cornell University; and a Founder of the Museum of Scotland
   Society. He was educated in Scotland and is a Fellow of the Faculty of
   Actuaries in Edinburgh, a Fellow of the Canadian Institute of Actuaries, a
   Fellow of the Conference of Actuaries, an Associate of the Society of
   Actuaries, a Member of the American Academy of Actuaries, the International
   Actuarial Association and the International Association of Consulting
   Actuaries.

>  W. Thomas Stephens

   [Photo of W. Thomas Stephens]

   Mr. Stephens, age 57, was, until 1999, the President and Chief Executive
   Officer of MacMillan Bloedel Limited, a forest products and building
   materials company.

   In 1996, Mr. Stephens retired as Chairman of the Board of Directors,
   President and Chief Executive Officer of Johns Manville Corporation.


                                       (12)



Nominees for Trustees

   Mr. Stephens serves as a Director for Qwest Communications, a communications
   company, New Century Energies, a public utility company, TransCanada
   Pipelines, and Fletcher Challenge Canada, a paper manufacturer. Mr. Stephens
   has B.S. and M.S. degrees from the University of Arkansas.

>  W. Nicholas Thorndike

   [Photo of W. Nicholas Thorndike]

   Mr. Thorndike, age 66, serves as a Director of various corporations and
   charitable organizations, including Bradley Real Estate, Inc., a real estate
   investment firm, Providence Journal Co., a newspaper publisher, and Courier
   Corporation, a book binding and printing company. He is also a Trustee of
   Cabot Industrial Trust and Northeastern University, a member of the Advisory
   Board of New England Electric Systems, and an Honorary Trustee of
   Massachusetts General Hospital, where he previously served as chairman and
   president.

   Prior to December 1988, Mr. Thorndike was the Chairman of the Board and
   Managing Partner of Wellington Management Company/Thorndike, Doran, Paine &
   Lewis, a registered investment advisor that manages mutual funds and
   institutional assets. He also previously served as a Trustee of the
   Wellington Group of Funds (now The Vanguard Group) and was the Chairman and a
   Director of Ivest Fund, Inc. Mr. Thorndike is a graduate of Harvard College.

- - --------------------

  *Nominees who are or may be deemed to be "interested persons" (as defined in
   the Investment Company Act of 1940) of your fund, Putnam Management, and
   Putnam Retail Management, Inc. ("Putnam Retail Management"), the principal
   underwriter for all the open-end Putnam funds and an affiliate of Putnam
   Management. Messrs. Lasser, Putnam, III, and Smith are deemed "interested
   persons" by virtue of their positions as officers or affiliates of your
   fund, or directors of Putnam Management, Putnam Retail Management, or
   Marsh & McLennan Companies, Inc., the parent company of Putnam Management
   and Putnam Retail Management.

                                       (13)



   Mr. Joskow is not currently an "interested person" of your fund but could be
   deemed by the Securities and Exchange Commission to be an "interested person"
   on account of his prior consulting relationship with National Economic
   Research Associates, Inc. a wholly-owned subsidiary of Marsh & McLennan
   Companies, Inc., which was terminated as of August 31, 1998.

   The balance of the nominees are not "interested persons."

   Except as indicated above, the principal occupations and business experience
   of the nominees for the last five years have been with the employers
   indicated, although in some cases they have held different positions with
   those employers.

   All the nominees were elected by the shareholders in October 1999. The 13
   nominees for election as Trustees at the shareholder meeting of your fund who
   receive the greatest number of votes will be elected Trustees of your fund.
   The Trustees serve until their successors are elected and qualified. Each of
   the nominees has agreed to serve as a Trustee if elected. If any of the
   nominees is unavailable for election at the time of the meeting, which is not
   anticipated, the Trustees may vote for other nominees at their discretion, or
   the Trustees may fix the number of Trustees at less than 13 for your fund.

   The address for each of the current Trustees and each of the nominees is One
   Post Office Square, Boston, Massachusetts 02109.

>  What are the Trustees' responsibilities?

   Your fund's Trustees are responsible for the general oversight of your fund's
   business and for assuring that your fund is managed in the best interests of
   its shareholders. The Trustees periodically review your fund's investment
   performance as well as the quality of other services provided to your fund
   and its shareholders by Putnam Management and its affiliates, including
   administration, custody, and investor servicing. At least annually, the
   Trustees review the fees paid to Putnam Management and its affiliates for
   these services and the

                                       (14)



   overall level of your fund's operating expenses. In carrying out these
   responsibilities, the Trustees are assisted by an independent administrative
   staff and by your fund's auditors and legal counsel, which are selected by
   the Trustees and are independent of Putnam Management and its affiliates.

>  Do the Trustees have a stake in your fund?

   The Trustees believe it is important that each Trustee have a significant
   investment in the Putnam funds. The Trustees allocate their investments among
   the more than 114 Putnam funds based on their own investment needs. The
   Trustees' aggregate investments in the Putnam funds total over $29 million.
   The table below lists each Trustee's current investments in the fund and in
   the Putnam funds as a group based on beneficial ownership. Except as
   otherwise noted, each Trustee has sole voting power and sole investment power
   with respect to his or her shares.

                                       (15)



Share Ownership by Trustees

                         Number of shares owned as of May 31, 2000:




                        Year first     All Putnam
                        elected as     funds             Putnam
                        Trustee of     (including        Master
                        the Putnam     notional          Income
Trustees                funds          shares)(1)(2)     Trust
- - ----------------------- ------------   ---------------   ------------
                                                   
Jameson A. Baxter       1994               161,048            135
Hans H. Estin           1972                35,915            932
John A. Hill            1985               231,092          1,500
Ronald J. Jackson       1996               165,186(3)         200(3)
Paul L. Joskow          1997                52,285            100
Elizabeth T. Kennan     1992                27,584(4)         167(4)
Lawrence J. Lasser      1992               521,035            100
John H. Mullin, III     1997                73,938            100
Robert E. Patterson     1984                91,400            300
George Putnam, III      1984               516,910            500
A.J.C. Smith            1986                46,333(5)         200(5)
W. Thomas Stephens      1997               139,100            100
W. Nicholas Thorndike   1992                85,531            215


(1) These holdings do not include shares of Putnam money market funds.

(2) Notional shares represent economic interests in a fund acquired by the
    Trustees pursuant to the terms of the Trustee Compensation Deferral Plan,
    and they do not have any voting power. None of the Trustees held notional
    shares in your fund.

(3) Mr. Jackson has shared investment power and shared voting power with
    respect to such shares.

(4) Dr. Kennan is the custodian of a trust which owns all of these shares and
    in which she has no economic interest.

(5) Mr. Smith has shared investment power and shared voting power with
    respect to such shares.

As of May 31, 2000, the Trustees and officers of Putnam Master Income Trust
owned a total of 4,549 shares, comprising less than 1% of the outstanding shares
of such fund on that date.

                                       (16)



>  What are some of the ways in which the Trustees represent shareholder
   interests?

   The Trustees believe that, as substantial investors in the Putnam funds,
   their interests are closely aligned with those of individual shareholders.
   Among other ways, the Trustees seek to represent shareholder interests:

   o  by carefully reviewing your fund's investment performance on an individual
      basis with your fund's managers;

   o  by also carefully reviewing the quality of the various other services
      provided to the funds and their shareholders by Putnam Management and its
      affiliates;

   o  by discussing with senior management of Putnam Management steps being
      taken to address any performance deficiencies;

   o  by conducting an in-depth review of the fees paid by your fund and by
      negotiating with Putnam Management to ensure that such fees remain
      reasonable and competitive with those of other mutual funds, while at the
      same time providing Putnam Management sufficient resources to continue to
      provide high quality services in the future;

   o  by reviewing brokerage costs and fees, allocations among brokers, soft
      dollar expenditures and similar expenses of each fund;

   o  by monitoring potential conflicts between the funds and Putnam Management
      and its affiliates to ensure that the funds continue to be managed in the
      best interests of their shareholders; and

   o  by also monitoring potential conflicts among funds to ensure that
      shareholders continue to realize the benefits of participation in a large
      and diverse family of funds.

>  How often do the Trustees meet?

   The Trustees meet each month (except August) over a two-day period to
   review the operations of your fund and of the other Putnam funds. A
   portion of these meetings is devoted to


                                       (17)



   meetings of various committees of the board which focus on particular
   matters. These currently include: the Contract Committee, which reviews all
   the contractual arrangements with Putnam Management and its affiliates; the
   Communication, Service and Marketing Committee, which reviews the quality of
   services provided by your fund's investor servicing agent and custodian; the
   Brokerage and Custody Committee, which reviews matters relating to custody of
   securities, best execution, brokerage costs and allocations and new
   investment techniques; the Audit Committee, which reviews procedures for the
   valuation of securities, the funds' accounting policies and the adequacy of
   internal controls and supervises the engagement of the funds' auditors; the
   Board Policy and Nominating Committee, which is composed of non-interested
   Trustees and which reviews the compensation of the Trustees and their
   administrative staff, supervises the engagement of the funds' independent
   counsel and selects nominees for election as Trustees; the Closed-end Funds
   and Variable Trust Committee, which is responsible for reviewing special
   issues applicable to closed-end funds such as your fund, and the Pricing
   Committee, which reviews procedures for the valuation of securities.

   Each Trustee generally attends at least two formal committee meetings during
   each regular meeting of the Trustees. During 1999, the average Trustee
   participated in approximately 40 committee and board meetings. In addition,
   the Trustees meet in small groups with Chief Investment Officers and
   Portfolio Managers to review recent performance and the current investment
   climate for selected funds. These meetings ensure that your fund's
   performance is reviewed in detail at least twice a year. The Contract
   Committee typically meets on several additional occasions during the year to
   carry out its responsibilities. Other Committees, including an Executive
   committee, may also meet on special occasions as the need arises.


                                       (18)



>  What are the Trustees paid for their services?

   Each Trustee of your fund receives a fee for his or her services. Each
   Trustee also receives fees for serving as Trustee of the other Putnam funds.
   The Trustees periodically review their fees to assure that such fees continue
   to be appropriate in light of their responsibilities as well as in relation
   to fees paid to trustees of other mutual fund complexes. The Board Policy and
   Nominating Committee, which consists solely of Trustees not affiliated with
   Putnam Management, estimates that committee and Trustee meeting time,
   together with the appropriate preparation, requires the equivalent of at
   least three business days per Trustee meeting. The following table shows the
   fees paid to each Trustee by the fund for its most recent fiscal year and the
   fees paid to each Trustee by all of the Putnam funds during calendar year
   1999:



                                       (19)



PUTNAM MASTER INCOME TRUST

Compensation Table




                                                    Estimated
                                       Pension or   annual
                                       retirement   benefits
                                       benefits     from all
                        Aggregate      accrued as   Putnam          Total
                        compensation   part of      funds           compensation
                        from the       fund         upon            from all
Trustee                 fund(1)        expenses     retirement(2)   Putnam funds(3)
- - ----------------------- -------------- ------------ --------------- ----------------------
                                                            
Jameson A. Baxter            $956          $180         $ 95,000        $191,000(4)
Hans H. Estin                 846           402           95,000         190,000
John A. Hill                  836           204          115,000         239,750(4)(5)
Ronald J. Jackson             927           251           95,000         193,500(4)
Paul L. Joskow                836           102           95,000         191,000(4)
Elizabeth T. Kennan           927           266           95,000         190,000
Lawrence J. Lasser            827           203           95,000         189,000
John H. Mullin, III           836           153           95,000         196,250(4)
Robert E. Patterson           841           138           95,000         190,250
George Putnam, III            841            94           95,000         190,000
A.J.C. Smith                  814           294           95,000         188,000
W. Thomas Stephens            839           143           95,000         188,000(4)
W. Nicholas Thorndike         846           373           95,000         190,000


(1) Includes an annual retainer and an attendance fee for each meeting attended.

(2) Assumes that each Trustee retires at the normal retirement date. Estimated
    benefits for each Trustee are based on Trustee fee rates in effect during
    calendar 1999.

(3) As of December 31, 1999, there were 114 funds in the Putnam family.

(4) Includes compensation deferred pursuant to a Trustee Compensation Deferral
    Plan.

(5) Includes additional compensation for service as Vice Chairman of the Putnam
    funds. Mr. Hill became Chairman of the Board of Trustees on July 1, 2000.


                                       (20)



   Under a Retirement Plan for Trustees of the Putnam funds (the "Plan"), each
   Trustee who retires with at least five years of service as a Trustee of the
   funds is entitled to receive an annual retirement benefit equal to one-half
   of the average annual compensation paid to such Trustee by the funds for the
   last three years of service prior to retirement. This retirement benefit is
   payable during a Trustee's lifetime, beginning the year following retirement,
   for a number of years equal to such Trustee's years of service compensated by
   the funds. A death benefit is also available under the Plan which assures
   that the Trustee and his or her beneficiaries will receive benefit payments
   for the lesser of an aggregate period of (i) ten years or (ii) such Trustee's
   total years of service.

   The Plan Administrator (a committee comprised of Trustees that are not
   "interested persons" of the fund, as defined in the Investment Company Act of
   1940) may terminate or amend the Plan at any time, but no termination or
   amendment will result in a reduction in the amount of benefits (i) currently
   being paid to a Trustee at the time of such termination or amendment, or (ii)
   to which a current Trustee would have been entitled had he or she retired
   immediately prior to such termination or amendment.

   For additional information about your fund, including further information
   about its Trustees and officers, please see "Fund Information," on page 36.

2. RATIFICATION OF INDEPENDENT AUDITORS

   KPMG LLP, 99 High Street, Boston, Massachusetts 02110, independent
   accountants, has been selected by the Trustees as the independent auditors of
   your fund for the current fiscal year. The Audit Committee of the Board of
   Trustees unanimously approved the selection of KPMG in June of 2000, and the
   Trustees unanimously approved such selection in July of 2000. Among the
   country's preeminent accounting firms, this firm also serves as the auditors
   for several of the other funds in the Putnam family. It was selected
   primarily on the basis of its expertise as auditors of investment companies,
   the quality of its audit services, and the competitiveness of its fees.


                                       (21)



   A majority of the votes on the matter is necessary to ratify the selection of
   auditors. A representative of the independent auditors is expected to be
   present at the meeting to make statements and to respond to appropriate
   questions.

3. APPROVAL OR DISAPPROVAL OF THE CONVERSION OF YOUR FUND FROM CLOSED-END TO
   OPEN-END STATUS AND CERTAIN RELATED AMENDMENTS TO YOUR FUND'S AGREEMENT AND
   DECLARATION OF TRUST


>  What is being considered under this item?

   Shareholders will have the opportunity to vote at the meeting on the question
   of whether your fund should be converted from a closed-end fund to an
   open-end fund. The Trustees, as discussed in more detail below, unanimously
   recommend that shareholders vote against converting your fund to an open-end
   fund. This recommendation is based on the Trustees' view that, as a
   closed-end fund, your fund is afforded significant investment advantages.

   If approved, the conversion would result in the "delisting" of your fund's
   shares from the New York Stock Exchange where they currently may be bought or
   sold at prevailing market prices. Your shares would then become redeemable
   directly from your fund at net asset value, eliminating any discount of
   market price to net asset value. Other differences between closed-end and
   open-end investment companies are described below.

   A conversion from closed-end to open-end status would also require a number
   of changes in the Agreement and Declaration of Trust (the "Declaration of
   Trust") under which your fund was established. Accordingly, approval of this
   proposal would also authorize your fund's Trustees to make such amendments as
   they may deem necessary to operate your fund in open-end form if this
   proposal is approved. These changes are described in greater detail below.


                                       (22)



>  Why is this question being submitted to shareholders now?

   Your fund's governing legal documents require that shareholders of your fund
   be given the opportunity to vote on a proposal to convert your fund from
   closed-end to open-end status if the fund's shares have traded at an average
   discount of more than 10% from their net asset value during the last twelve
   calendar weeks of the preceding fiscal year (measured as of the last trading
   day in each such week). For the twelve-week period ended October 29, 1999,
   your fund's shares traded at an average discount of 11.04%, requiring that
   this proposal be submitted to shareholders. A similar vote was held at the
   1996 and 1997 annual meetings of shareholders. At those meetings shareholders
   voted to retain closed-end status as follows:

   1997 Annual Meeting
   Percentage of Shares Voted

                           
   For Open-ending             17.9%
   Against Open-ending        76.02%
   Abstain                      6.0%


   1996 Annual Meeting
   Percentage of Shares Voted

                           
   For Open-ending            21.2%
   Against Open-ending        71.8%
   Abstain                     6.9%


>  What is the recommendation of the Trustees?

   The Trustees regularly review the overall performance and trading information
   for your fund and all of the Putnam closed-end funds. At meetings held in May
   and June of this year, the Trustees of your fund carefully evaluated the
   fund's investment performance, the trading history of its shares since its
   inception in December 1987, and information about the possible advantages and
   disadvantages of converting to an open-end fund. For the reasons described
   below, the Trustees of your fund have unanimously concluded that the
   conversion of your fund to open-end status would


                                       (23)



   not be in the best long-term interests of shareholders. Accordingly, the
   Trustees of your fund unanimously recommend that shareholders vote "AGAINST"
   this proposal.

>  Why are the Trustees recommending a vote against a conversion?

   The Trustees of your fund are recommending a vote against converting your
   fund to open-end status for the following reasons:

   o  The Trustees believe that your fund's closed-end status provides
      investment benefits not available to open-end fund investors. Because your
      fund's shares are not redeemable, your fund is not required to maintain
      short-term, lower-yielding investments in anticipation of possible
      redemptions, but can be fully invested in higher-yielding securities in
      pursuit of the fund's investment objective. Furthermore, as a closed-end
      fund, your fund does not experience the cash flows associated with sales
      and redemptions of open-end fund shares. As a result, your fund's
      portfolio manager does not have to invest additional cash from new sales
      at times when market conditions are unfavorable or sell securities to meet
      redemptions at inopportune times.

   o  The Trustees believe that your fund's operating expenses are likely to
      increase if it is converted to open-end status. As an open-end fund, your
      fund would be required, as a practical matter, to make a continuous public
      offering of its shares in order to offset redemptions and maintain the
      economies of scale available at its current size. The Trustees expect that
      in order to market your fund's shares effectively and to conform generally
      to sales practices of competing dealer-sold funds, following a conversion
      to open-end status, the Trustees would likely recommend that shareholders
      approve the adoption of a distribution plan under Rule 12b-1. Such a plan
      would permit your fund to pay annual distribution fees of up to 0.35% of
      your fund's net assets. If such a distribution plan were approved, the

                                       (24)



      Trustees would expect to authorize the payment of distribution fees at the
      annual rate of 0.20% of net assets, as is the case with similar open-end
      Putnam funds. In addition, all shareholders would bear the brokerage and
      other transactional costs associated with purchases and sales of
      securities by your fund in response to the sale or redemption of shares if
      your fund were converted to open-end status (except to the extent that the
      Trustees decide to impose a temporary redemption fee, as described below).

   o  It is possible that redemptions by shareholders would cause your fund to
      shrink following conversion to open-end status, and, everything else being
      equal, thereby resulting in an increased expense ratio for remaining
      shareholders. However open-end funds, which continually offer new shares
      to the public, also have the ability to increase in size. Growth in your
      fund's size could result in efficiencies and spread fixed costs over a
      larger pool of assets. Putnam Management has advised the Trustees that it
      is likely that your fund would experience significant net redemptions
      following any conversion, thereby shrinking in size. Depending on the size
      of future redemptions or sales, increased expense ratios could result for
      either temporary or indefinite periods.

   o  The need to sell securities to meet redemptions may have adverse tax
      consequences to shareholders remaining in your fund. If your fund sells
      securities to meet redemptions and realizes a gain for tax purposes, your
      fund will be required to make capital gain distributions and allocate the
      tax gain to all shareholders, not simply to those redeeming.

   o  In light of the potential loss of the advantages of closed-end status and
      the potential increase of expenses that would likely follow, conversion
      could result in a lower yield for the shareholders. This result is
      inconsistent with the fund's investment objective of seeking high current
      income consistent with preservation of capital.


                                       (25)



   The Trustees believe that most shareholders of your fund purchased their
   shares with a long-term investment perspective that recognizes the special
   advantages of the closed-end structure as well as the disadvantages of
   potential discounts. Consequently, the Trustees do not believe that recent
   discount levels should be viewed as grounds for depriving shareholders of the
   advantages of the closed-end structure, especially in light of the fact that
   historically the fund's discount levels fluctuate and have not always been as
   large as they currently are.

>  Are there any advantages to converting the fund to open-end status?

   Yes. By converting to an open-end fund, your fund would immediately offer you
   the ability to redeem your shares at their net asset value less any
   redemption fee that the Trustees may impose. As of July 3, 2000 the price of
   your shares in the fund represented a discount of 12.55% to their net asset
   value. This means that if you sold shares on July 3, 2000 you would receive
   only 87.45% of your pro rata share of your fund's assets. If the fund were
   converted, you would be able to receive 100% of your pro rata share less any
   redemption fee imposed by the Trustees. This would represent a one-time
   increase in the value of your shares.

   The Trustees have also considered the potential decrease in expense ratio
   that would arise if your fund grows in size as a result of net sales of new
   shares. As an open-end fund your fund would constantly be offering new shares
   to the public. If more new shares are sold than redeemed, the fund could grow
   in size, resulting in a lower effective management fee and a lower expense
   ratio. As stated above, Putnam Management has advised the Trustees that
   Putnam Management does not expect that the fund would grow in size following
   a conversion to open-end status.


                                       (26)



   After considering the reasons set forth above, the Trustees do not believe
   that the current discount justifies the fundamental changes that would result
   from a conversion to open-end status. The Trustees unanimously recommend that
   shareholders vote against this proposal.

>  How has your fund performed?

   The following table summarizes the annualized total return of your fund for
   the periods shown based on the net asset value and the market value of its
   shares:

   Total Return (Annualized) Through May 31, 2000



                          1 year       3 years     5 years     10 years
   --------------------------------------------------------------------
                                                    
   Net Asset Value         1.21%       2.44%       5.51%        9.19  %
   Market Value           -7.07%      -0.90%       4.46%        8.41%*


  *Market value performance from inception, unlike net asset value performance,
   reflects the cost of the dealer commission upon initial sale.

   Of course, relative performance is also important. In addition to reviewing
   the fund's overall performance, the Trustees regularly review the fund's
   performance compared to that of a group of comparable funds. To compare the
   funds, the Trustees use a formula that assigns a weighting to three factors:
   yield, total return and risk. Based on this formula your fund was ranked at
   approximately the midpoint of funds in its peer group as of December 31,
   1999.

> What are the principal differences between a closed-end and open-end fund?

   In evaluating this proposal, shareholders may wish to consider the following
   differences between closed-end and open-end funds:

   o  Changes in capital. Closed-end funds raise their capital through an
      initial public offering and generally do not raise additional capital
      after that time. Closed-end funds therefore have limited opportunities to
      gain additional economies


                                       (27)



      of scale through growth of assets. At the same time, because shares of
      closed-end funds cannot be redeemed, the risk of higher expense ratios
      resulting from a decline in assets is also limited.

      Open-end funds, in contrast, generally engage in a continuous public
      offering of their shares, which provides the opportunity for growth of
      assets and reduced expense ratios. However, because shares of open-end
      funds are generally redeemable at any time, such funds face the risk of
      higher expense ratios if significant redemptions are not offset by sales
      of new shares.

   o  Sale of shares. Shares of open-end funds may be redeemed at any time at
      their net asset value (subject only to the right of the fund to withhold
      payment for up to seven days or, with the permission of the SEC, to
      suspend redemptions under emergency conditions). In contrast, shares of
      closed-end funds are not redeemable and can generally be bought and sold
      at current market prices only on the exchange on which such funds are
      listed. Thus, converting your fund from closed-end to open-end status
      would eliminate the current discount between market price and net asset
      value. Shareholders who wish to dispose of shares would receive a higher
      price at net asset value than if shares remained at a discount.

   o  Regulatory requirements. Both closed-end and open-end funds are registered
      with the SEC under the Investment Company Act of 1940 and, with certain
      differences relating largely to the sale and redemption of shares, are
      generally subject to the same regulatory requirements of that Act. Your
      fund's shares are listed for trading on the New York Stock Exchange. That
      listing would be terminated in the event of a conversion to open-end
      status. Since open-end funds generally engage in a continuous public
      offering of their shares they are required to maintain current
      registrations under federal and state securities laws, which involves
      additional costs.


                                       (28)



   o  Annual shareholder meetings. Your fund is currently required by the rules
      of the New York Stock Exchange to hold annual meetings of shareholders for
      the purpose of electing Trustees and ratifying the selection of auditors.
      As noted above, conversion of your fund to open-end status would result in
      termination of the fund's listing on the New York Stock Exchange with the
      result that your fund would no longer be required to hold annual meetings.
      In such event, your fund expects that meetings would be held only on an
      as-needed basis.

   o  Investment flexibility. As noted above, the cash flows associated with
      sales and redemptions of open-end fund shares, as well as the need to
      maintain cash reserves in anticipation of possible redemptions, might tend
      to reduce the investment flexibility of open-end funds.

   o  Shareholder privileges. Shareholders of your fund currently have the
      option of participating in the fund's Dividend Reinvestment Plan, under
      which cash distributions paid by your fund are generally reinvested
      through the purchase of additional fund shares at market prices, which
      currently reflect a discount from net asset value. (At times when your
      fund's shares are trading at a premium over their net asset value, such
      reinvestments are made at the higher of net asset value or 95% of market
      value.) If the fund were to convert to open-end status, shareholders would
      no longer be able to reinvest dividends at a price below net asset value
      per share. Shareholders of open-end Putnam funds have the option to
      reinvest their distributions in additional shares at net asset value at
      all times.

      Shareholders of open-end funds in the Putnam family of funds currently
      have the privilege of exchanging their investment at net asset value and
      without sales charges for shares of more than 75 open-end funds in the
      Putnam group. Shareholders of your fund currently do not have that
      privilege.


                                       (29)



>  What other possible consequences might result from conversion of your fund to
   open-end status?

   In addition to those matters described above, you should consider the
   following possible consequences of conversion of your fund to open-end
   status:

   o  Certain legal, accounting and other costs would be incurred in connection
      with the conversion of your fund to open-end status. Although it is
      difficult to estimate these costs with precision, these costs are
      estimated to be at least $100,000. Based on your fund's current size it is
      not anticipated that these costs would materially increase your fund's
      expense ratio.

   o  The Trustees reserve the right to impose a temporary redemption fee of up
      to 2.00% of the value of shares redeemed for a period of up to one year
      following the fund's conversion to an open-end investment company. The
      Trustees may impose this fee if they believe that immediately following a
      conversion to open-end status there would likely be significant
      redemptions of shares that would disrupt long-term portfolio management of
      the fund and dilute the interests of the remaining shareholders.
      Imposition of a redemption fee may deter certain redemptions and would
      compensate remaining long-term shareholders for the costs of the
      liquidation of a significant percentage of the fund's portfolio.

   The fund will notify shareholders in writing prior to the imposition of any
   temporary redemption fee.

>  What changes would be made in your fund's Declaration of Trust if
   shareholders vote to convert the fund to open-end status?

   Conversion of your fund from a closed-end to an open-end fund would require
   certain changes to your fund's Declaration of Trust and, therefore, a vote in
   favor of such conversion would also authorize the Trustees to amend your
   fund's Declaration of Trust to reflect such changes. These changes would
   bring your fund's Declaration of Trust more in line with most other Putnam
   open-end funds.


                                       (30)



   The Declaration of Trust would be amended to require your fund to purchase
   all shares offered to it for redemption at a price equal to the net asset
   value of the shares next determined, less any redemption or sales charge
   fixed by the Trustees. In addition, the fund would be authorized, at its
   option, to redeem shares held in a shareholder's account at net asset value
   if at any time a shareholder owned shares in an amount either less than or
   greater than, as the case may be, an amount determined by the Trustees.
   Notwithstanding this provision, all shares would be redeemable at a
   shareholder's option.

   The Declaration of Trust would also be amended to eliminate certain
   provisions that relate specifically to the fund's closed-end status, such as
   the conversion provision that has necessitated this proposal.

   Finally, the Trustees would also make certain necessary technical and
   non-material changes to the Declaration of Trust and conforming changes to
   your fund's Bylaws if the shareholders vote in favor of the conversion.

>  What percentage of shareholders' votes are required to approve the
   conversion?

   Approval of the conversion of your fund to open-end status and of the related
   amendments to your fund's Declaration of Trust will require the "yes" vote of
   a majority of your fund's outstanding shares entitled to vote.

   If such conversion were approved, the conversion would become effective
   following compliance with all necessary regulatory requirements under federal
   and state law. Your fund would seek to complete this process as soon as
   reasonably practicable, but it is estimated that this process may require at
   least several months.

>  If the conversion is not approved, will the fund continue in its current
   form?

   Yes. In the event that shareholders do not approve the conversion of your
   fund to open-end status, your fund would continue to operate as a closed-end
   fund. Shareholders would


                                       (31)



   be given the opportunity to vote on a proposed conversion to open-end status
   in future years if your fund's shares again trade at discounts sufficient to
   meet the requirement of the Declaration of Trust described above.

   The Trustees believe that the continued operation of your fund as a
   closed-end fund is in the best long-term interests of shareholders, and
   unanimously recommend a vote against the conversion of your fund to open-end
   status at this time.

   The Trustees recommend that you vote "AGAINST" Proposal 3.

Further Information About Voting and the Meeting

   Quorum and Methods of Tabulation. Thirty percent of the shares entitled to
   vote--present in person or represented by proxy--constitutes a quorum for the
   transaction of business with respect to any proposal at the meeting (unless
   otherwise noted in the proxy statement). Shares represented by proxies that
   reflect abstentions and "broker non-votes" (i.e., shares held by brokers or
   nominees as to which (i) instructions have not been received from the
   beneficial owners or the persons entitled to vote and (ii) the broker or
   nominee does not have the discretionary voting power on a particular matter)
   will be counted as shares that are present and entitled to vote on the matter
   for purposes of determining the presence of a quorum. Votes cast by proxy or
   in person at the meeting will be counted by persons appointed by your fund as
   tellers for the meeting.

   The tellers will count the total number of votes cast "for" approval of the
   proposals for purposes of determining whether sufficient affirmative votes
   have been cast. With respect to the election of Trustees and selection of
   auditors, neither abstentions nor broker non-votes have any effect on the
   outcome of the proposal. With respect to any other proposals, abstentions and
   broker non-votes have the effect of a negative vote on the proposal.

   Other business. The Trustees know of no other business to be brought before
   the meeting. However, if any other matters prop-



                                       (32)



   erly come before the meeting, it is their intention that proxies that do not
   contain specific restrictions to the contrary will be voted on such matters
   in accordance with the judgment of the persons named as proxies in the
   enclosed form of proxy.

   Solicitation of proxies. In addition to soliciting proxies by mail, Trustees
   of your fund and employees of Putnam Management, Putnam Fiduciary Trust
   Company and Putnam Retail Management may solicit proxies in person or by
   telephone. Your fund may also arrange to have voting instructions recorded by
   telephone. The telephone voting procedure is designed to authenticate
   shareholders' identities, to allow them to authorize the voting of their
   shares in accordance with their instructions and to confirm that their
   instructions have been properly recorded. Your fund has been advised by
   counsel that these procedures are consistent with the requirements of
   applicable law. If these procedures were subject to a successful legal
   challenge, such votes would not be counted at the meeting. Your fund is
   unaware of any such challenge at this time. Shareholders would be called at
   the phone number Putnam Investments has in its records for their accounts,
   and would be asked for their Social Security number or other identifying
   information. The shareholders would then be given an opportunity to authorize
   proxies to vote their shares at the meeting in accordance with their
   instructions. To ensure that the shareholders' instructions have been
   recorded correctly, they will also receive a confirmation of their
   instructions in the mail. A special toll-free number will be available in
   case the information contained in the confirmation is incorrect.

   Shareholders may have the opportunity to submit their voting instructions via
   the Internet by utilizing a program provided by a third party vendor hired by
   Putnam Management. The giving of such a proxy will not affect your right to
   vote in person should you decide to attend the meeting. To vote via the
   Internet, you will need the 14-digit "control" number that appears on your
   proxy card. To use the Internet, please access the Internet address found on
   your proxy card on the World


                                       (33)



   Wide Web. The Internet voting procedures are designed to authenticate
   shareholder identities, to allow shareholders to give their voting
   instructions, and to confirm that shareholders' instructions have been
   recorded properly. Shareholders voting via the Internet should understand
   that there may be costs associated with Internet access, such as usage
   charges from Internet access providers and telephone companies, that must be
   borne by the shareholders.

   Your fund's Trustees have adopted a general policy of maintaining
   confidentiality in the voting of proxies. Consistent with that policy, your
   fund may solicit proxies from shareholders who have not voted their shares or
   who have abstained from voting.

   Persons holding shares as nominees will upon request be reimbursed for their
   reasonable expenses in soliciting instructions from their principals. Your
   fund has retained at its expense D. F. King & Co., Inc., 77 Water Street, New
   York, New York 10005, to aid in the solicitation instructions for nominee
   accounts, for a fee not to exceed $3,000 plus reasonable out-of-pocket
   expenses for mailing and phone costs.

   Revocation of proxies. Proxies, including proxies given by telephone or over
   the Internet, may be revoked at any time before they are voted either (i) by
   a written revocation received by the Associate Clerk of your fund, (ii) by
   properly executing a later-dated proxy, (iii) by recording later-dated voting
   instructions via the Internet or (iv) by attending the meeting and voting in
   person.

   Date for receipt of shareholders' proposals for the next annual meeting. It
   is currently anticipated that your fund's next annual meeting of shareholders
   will be held in October 2001. Shareholder proposals to be included in the
   proxy statement for that meeting must be received by your fund before March
   28, 2001. Shareholders who wish to make a proposal at the 2001 annual
   meeting--other than one that will be included in the fund's proxy
   materials--should notify the fund no later than June 5, 2001. The Board
   Policy and Nominating Committee will also consider


                                       (34)



   nominees recommended by shareholders of the fund to serve as Trustees,
   provided that shareholders submit their recommendations by the above date. If
   a shareholder who wishes to present a proposal fails to notify the fund by
   that date, the proxies solicited for the meeting will have discretionary
   authority to vote on the shareholder's proposal if it is properly brought
   before the meeting. If a shareholder makes a timely notification, the proxies
   may still exercise discretionary voting authority under circumstances
   consistent with the SEC's proxy rules.

   Adjournment. If sufficient votes in favor of any of the proposals set forth
   in the Notice of the Meeting are not received by the time scheduled for the
   meeting, the persons named as proxies may propose adjournments of the meeting
   for a period or periods of not more than 60 days in the aggregate to permit
   further solicitation of proxies with respect to those proposals. Any
   adjournment will require the affirmative vote of a majority of the votes cast
   on the question in person or by proxy at the session of the meeting to be
   adjourned. The persons named as proxies will vote in favor of adjournment
   those proxies that they are entitled to vote in favor of such proposals. They
   will vote against adjournment those proxies required to be voted against such
   proposals. Your fund pays the costs of any additional solicitation and of any
   adjourned session. Any proposals for which sufficient favorable votes have
   been received by the time of the meeting may be acted upon and considered
   final regardless of whether the meeting is adjourned to permit additional
   solicitation with respect to any other proposal.

   Financial information. Your fund will furnish to you upon request and without
   charge, a copy of the fund's annual report for its most recent fiscal year,
   and a copy of its semiannual report for any subsequent semiannual period.
   Such requests may be directed to Putnam Investor Services, P.O. Box 41203,
   Providence, RI 02940-1203 or 1-800-225-1581.


                                       (35)



Fund Information

   Putnam Investments. Putnam Investment Management, Inc., the fund's investment
   manager, and its affiliates, Putnam Retail Management, Inc., the fund's
   principal underwriter, and Putnam Fiduciary Trust Company, the fund's
   investor servicing agent and custodian (collectively, the "Putnam
   companies"), are owned by Putnam Investments, Inc., a holding company that
   is, except for a minority stake owned by employees, is in turn owned by Marsh
   & McLennan Companies, Inc., a leading professional services firm that
   includes risk and insurance services, investment management and consulting
   businesses. The address of the executive offices of Marsh & McLennan
   Companies, Inc. is 1166 Avenue of the Americas, New York, New York 10036.

   Limitation of Trustee liability. The Declaration of Trust of your fund
   provides that the fund will indemnify its Trustees and officers against
   liabilities and expenses incurred in connection with litigation in which they
   may be involved because of their offices with the fund, except if it is
   determined in the manner specified in the Declaration of Trust that they have
   not acted in good faith in the reasonable belief that their actions were in
   the best interests of the fund or that such indemnification would relieve any
   officer or Trustee of any liability to the fund or its shareholders arising
   by reason of willful misfeasance, bad faith, gross negligence or reckless
   disregard of his or her duties. Your fund, at its expense, provides liability
   insurance for the benefit of its Trustees and officers.

   Audit Committee and Board Policy and Nominating Committee. The members of the
   Audit Committee of your fund include only Trustees who are not "interested
   persons" of the fund or Putnam Management. The Audit Committee currently
   consists of Dr. Kennan and Messrs. Estin and Stephens (Chairman). The Board
   Policy and Nominating Committee consists only of Trustees who are not
   "interested



                                       (36)



   persons" of your fund or Putnam Management. The Board Policy and Nominating
   Committee currently consists of Dr. Kennan (Chairperson), Messrs. Hill,
   Patterson and Thorndike.

   Officers and other information. All of the officers of your fund are
   employees of Putnam Management or its affiliates. Because of their positions
   with Putnam Management or its affiliates or their ownership of stock of Marsh
   & McLennan Companies, Inc., the parent corporation of Putnam Management and
   Putnam Retail Management, Messrs. Putnam, III, Lasser and Smith (nominees for
   Trustees of your fund), as well as the officers of your fund, will benefit
   from the management fees, custodian fees, and investor servicing fees paid or
   allowed by the fund. In addition to George Putnam, III and Lawrence J.
   Lasser, the officers of your fund are as follows:




   Putnam Master Income Trust
                                                               Year first
                                                               elected
   Name (age)                     Office                       to office
   -----------------------------------------------------------------------------
                                                            
   Charles E. Porter (61)         Executive Vice President        1989
   Patricia C. Flaherty (53)      Senior Vice President           1993
   John D. Hughes (65)            Senior Vice President
                                   & Treasurer                    1989
   Gordon H. Silver (52)          Vice President                  1990
   David L. Waldman* (34)         Vice President                  1998
   Richard A. Monaghan** (45)     Vice President                  1999
   John R. Verani (60)            Vice President                  1989


  *The fund's portfolio manager
 **President of Putnam Retail Management


                                       (37)



   Assets and shares outstanding of your fund as of May 31, 2000

   Net assets:                                                  $393,544,122

   Common shares outstanding and authorized to vote:   53,095,749.188 shares

        5% beneficial ownership of your fund as of May 31, 2000

   Persons beneficially owning more than 5% of the fund's shares        none


                                       (38)



PUTNAM INVESTMENTS

The Putnam Funds
One Post Office Square
Boston, Massachusetts 02109
Toll-free 1-800-225-1581

                                                                    62709 8/00




PUTNAMINVESTMENTS                   (Logo)
                     P.O. Box 9131
                     Hingham, MA 02043-9131

FOR YOUR CONVENIENCE YOU MAY RECORD YOUR VOTING INSTRUCTIONS VIA THE INTERNET
OR BY RETURNING THIS PROXY CARD BY MAIL

Your vote is very important. If you choose to record your voting instructions
via the Internet, visit the website at www.proxyweb.com/Putnam. Please refer to
                                       -----------------------
the instructions below. Your voting instructions will be immediately confirmed
if you provide your e-mail address.

To record your voting instructions on the Internet

1. Read the proxy statement.
2. Go to www.proxyweb.com/Putnam.
         ------------------------
3. Enter the 14-digit control number printed on your proxy card.
4. Follow the instructions on the site.

If you submit your voting instructions on the Internet, do not return your proxy
card.

This is your PROXY CARD.

To vote by mail, please record your voting instructions on this proxy card, sign
it below, and return it promptly in the envelope provided. Your vote is
important.

   PLEASE FOLD AT PERFORATION BEFORE DETACHING

Proxy for a meeting of shareholders to be held on October 5, 2000 for Putnam
Master Income Trust.

This proxy is solicited on behalf of the Trustees of the fund.

The undersigned shareholder hereby appoints John A. Hill, Hans H. Estin, and
Robert E. Patterson, and each of them separately, Proxies, with power of
substitution, and hereby authorizes them to represent such shareholder and to
vote, as designated below, at the meeting of shareholders of Putnam Master
Income Trust on October 5, 2000, at 2:00 p.m., Boston time, and at any
adjournments thereof, all of the shares of the fund that the undersigned
shareholder would be entitled to vote if personally present.


                                        -1-


               PLEASE BE SURE TO SIGN AND DATE THIS PROXY.

Please sign your name exactly as it appears on this card. If you are a joint
owner, each owner should sign. When signing as executor, administrator,
attorney, trustee, or guardian, or as custodian for a minor, please give your
full title as such. If you are signing for a corporation, please sign the full
corporate name and indicate the signer's office. If you are a partner, sign in
the partnership name.

- - --------------------------------------------------------------------------------
Shareholder sign here                                Date

- - --------------------------------------------------------------------------------
Co-owner sign here                                   Date



HAS YOUR ADDRESS CHANGED?

Please use this form to notify us of any change in address or telephone number
or to provide us with your comments. Detach this form from the proxy card and
return it with your signed proxy in the enclosed envelope.

Name

- - --------------------------------------------------------------------------------
Street

- - --------------------------------------------------------------------------------
City                                          State                          Zip
- - --------------------------------------------------------------------------------
Telephone

- - --------------------------------------------------------------------------------

DO YOU HAVE ANY COMMENTS?

- - --------------------------------------------------------------------------------

- - --------------------------------------------------------------------------------

                                        -2-



DEAR SHAREHOLDER:

Your vote is important. Please help us to eliminate the expense of follow-up
mailings by signing and returning this proxy card or by recording your voting
instructions via the Internet as soon as possible. A postage-paid envelope is
enclosed for your convenience.

THANK YOU!

PLEASE FOLD AT PERFORATION BEFORE DETACHING

 If you complete and sign the proxy, we'll vote exactly as you tell us. The
 Proxies are authorized to vote in their discretion upon any matters as may
 properly come before the meeting or at any adjournments of the meeting. If you
 simply sign the proxy, or fail to provide your voting instructions on a
 proposal, the Proxies will vote FOR fixing the number of Trustees as set forth
             in Proposal 1, FOR Proposal 2 and AGAINST Proposal 3.

      THE TRUSTEES RECOMMEND A VOTE FOR FIXING THE NUMBER OF TRUSTEES AND
                        ELECTING ALL THE NOMINEES:

Please vote by filling in the appropriate boxes below.

1.  Proposal to fix the number of Trustees and elect all nominees.

    The nominees for Trustees are: J.A. Baxter, H.H. Estin, J.A. Hill, R.J.
    Jackson, P.L. Joskow, E.T. Kennan, L.J. Lasser, J.H. Mullin, III, R.E.
    Patterson, G. Putnam, III, A.J.C. Smith, W.T. Stephens and W.N. Thorndike.

/ / FOR fixing the number of Trustees as proposed and electing all the nominees
    (except as marked to the contrary below)

    To withhold authority to vote for one or more of the nominees, write
    the name(s) of the nominee(s) below:

    ----------------------------------------------------------------------------

/ / WITHHOLD authority to vote for all nominees


               THE TRUSTEES RECOMMEND A VOTE FOR PROPOSAL 2:

                                               FOR        AGAINST       ABSTAIN


2.  Proposal to ratify                         /  /       /  /          /  /
    the selection of
    KPMG LLP
    as the independent auditors of your fund.

              THE TRUSTEES RECOMMEND A VOTE AGAINST PROPOSAL 3:

                                               FOR        AGAINST       ABSTAIN

3.  Proposal to convert                        /  /       /  /          /  /
    your fund from closed-end to
    open-end status and authorize
    certain related amendments to the
    Agreement and Declaration of Trust.

Note:  If you have questions on any of the proposals, please call
1-800-225-1581.