PIONEER INTEREST SHARES
PRE 14A, 1997-06-25
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                                                            File No. 2-42352
                                                            File No. 811-2239


                                  SCHEDULE 14A
                                 (Rule 14a-101)

                     INFORMATION REQUIRED IN PROXY STATEMENT

                            SCHEDULE 14A INFORMATION



                    PROXY STATEMENT PURSUANT TO SECTION 14(A)
             OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. )


Filed by the registrant
[X]


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
         Rule 14a-11(c) or Rule 14a-12




                             Pioneer Interest Shares
                 (Name of Registrant as Specified in Its Charter


                             Pioneer Interest Shares
                   (Name of Person(s) Filing Proxy Statement)



<PAGE>




                         PIONEER INTEREST SHARES 
                              60 STATE STREET 
                        BOSTON, MASSACHUSETTS 02109 
                              1-800- 
                 NOTICE OF ANNUAL MEETING OF SHAREHOLDERS 
                  TO BE HELD TUESDAY, SEPTEMBER 16, 1997 

    The Annual Meeting of Shareholders (the "Meeting") of Pioneer Interest 
Shares, a Delaware business trust (the "Fund"), will be held at the 
offices of Hale and Dorr LLP, counsel to the Fund, at 60 State Street, 
26th floor, Boston, Massachusetts 02109 on Tuesday, September 16, 1997 at 
2:00 p.m. (Boston time) to consider and act upon the following proposals: 

    1. To elect the nine (9) Trustees named in the attached Proxy 
       Statement to serve on the Fund's Board of Trustees until their 
       successors have been duly elected and qualified; 

    2. To ratify the selection of Arthur Andersen LLP as the Fund's 
       independent public accountants for the fiscal year ending December 
       31, 1997; and 

    3. To transact such other business as may properly come before the 
       Meeting or any adjournment thereof. 

    Shareholders of record as of the close of business on July 8, 1997, 
are entitled to vote at the Meeting or any adjournment thereof. 

                               By Order of the Board of Trustees, 
                               Joseph P. Barri, Secretary 

Boston, Massachusetts 
July 18, 1997 



    WHETHER OR NOT YOU EXPECT TO BE PRESENT AT THE MEETING, PLEASE 
COMPLETE AND RETURN THE ENCLOSED PROXY CARD. YOU MAY STILL VOTE IN PERSON 
IF YOU ATTEND THE MEETING. 



                                                                  0697-4317 
<PAGE>

                             PIONEER INTEREST SHARES
                              60 STATE STREET 
                        BOSTON, MASSACHUSETTS 02109 
                              1-800- 
                              PROXY STATEMENT 
                      ANNUAL MEETING OF SHAREHOLDERS 
                            SEPTEMBER 16, 1997 

                               INTRODUCTION 

    This Proxy Statement is furnished to shareholders of Pioneer Interest 
Shares, a Delaware business trust (the "Fund"), in connection with the 
solicitation of proxies by the Fund's Board of Trustees for use at the 
Annual Meeting of Shareholders (the "Meeting") to be held at the offices 
of Hale and Dorr LLP, counsel to the Fund, at 60 State Street, 26th floor, 
Boston, Massachusetts 02109 on Tuesday, September 16, 1997 at 2:00 p.m. 
(Boston time) and at any adjournment thereof, for the purposes set forth 
in the accompanying Notice of Annual Meeting of Shareholders. 

    The attached Notice, this Proxy Statement (the "Proxy Statement") and 
the enclosed proxy card are being mailed to shareholders on or after July 
18, 1997. THE FUND'S ANNUAL REPORT FOR ITS FISCAL PERIOD ENDED DECEMBER 
31, 1996 WAS MAILED TO SHAREHOLDERS ON OR ABOUT              , 1997. 
ADDITIONAL COPIES MAY BE OBTAINED FREE OF CHARGE BY WRITING TO THE FUND AT 
ITS EXECUTIVE OFFICES, 60 STATE STREET, BOSTON, MASSACHUSETTS 02109 OR BY 
CALLING 1-800-225-6292. 

    Shareholders of record as of the close of business on July 8, 1997 
(the "Record Date") are entitled to vote on all business of the Meeting or 
any adjournments thereof. As of the Record Date,           shares of 
beneficial interest of the Fund were outstanding. To the knowledge of the 
management of the Fund, no person beneficially owned more than 5% of the 
outstanding shares of the Fund as of July 8, 1997 except that Cede and 
Co., Box 20, Bowling Green Station, New York, NY 10004-0001, held 
        shares as nominee. 

                                PROPOSAL 1. 
                       ELECTION OF BOARD OF TRUSTEES 

    The persons named on the accompanying proxy card intend to vote at the 
Meeting (unless otherwise directed) FOR the election of the nine (9) 
nominees named below as Trustees of the Fund. All of the nominees, except 
Mary K. Bush, currently serve as Trustees and all have been recommended by 
the Nominating Committee of the Trustees which consists solely of the 
Trustees who are not "interested persons" of the Fund, Pioneering 
Management Corporation ("PMC") or Pioneer Funds Distributor, Inc. ("PFD") 
within the meaning of the Investment Company Act of 1940, as amended (the 
"1940 Act"). 

    Each Trustee will be elected to hold office until the next meeting of 
shareholders or until his or her successor is elected and qualified. Each 
nominee has consented to being named herein and indicated his or her 
willingness to serve if elected. If any such nominee should be unable to 
serve, an event not now anticipated, the persons named as proxies may vote 
for such other person as shall be designated by the Board of Trustees. 

    The following table sets forth each nominee's position(s) with the 
Fund, age, address, principal occupation or employment during the past 
five years; trusteeships and directorships, and indicates the date on 
which he or she first became a Trustee of the Fund. The table also shows 
the number of shares of beneficial interest of the Fund beneficially owned 
by each nominee, directly or indirectly, on May 30, 1997. 


<TABLE>
<CAPTION>
                                                                           SHARES OF BENEFICIAL 
                                                                           INTEREST OF THE FUND 
                                                                          BENEFICIALLY OWNED AND 
       NAME, AGE,                PRINCIPAL OCCUPATION           FIRST       PERCENTAGE OF TOTAL 
  POSITION(S) WITH THE               OR EMPLOYMENT             BECAME A    SHARES OUTSTANDING ON 
    FUND AND ADDRESS       AND DIRECTORSHIPS/TRUSTEESHIPS(1)   TRUSTEE        MAY 30, 1997(2) 
<S>                        <C>                                 <C>         <C>
JOHN F. COGAN, JR., 71*.   President, Chief Executive Officer    1993              1,000 
  Chairman of the Board,     and a Chairman of the Board,                          (0.0)% 
  President and Trustee      Director of The Pioneer Group, 
  60 State Street            Inc., a public company ("PGI"); 
  Boston, MA 02109           Chairman and a Director of 
                             Pioneering Management 
                             Corporation ("PMC"), Pioneer 
                             Funds Distributor, Inc. ("PFD"), 
                             Pioneer Goldfields Limited 
                             ("PGL") and Teberebie Goldfields 
                             Limited; Director of Pioneering 
                             Services Corporation ("PSC"), 
                             Pioneer Capital Corporation 
                             ("PCC") and Forest-Starma (a 
                             Russian timber joint venture); 
                             President and Director of Pioneer 
                             Plans Corporation ("PPC"), 
                             Pioneer Investment Corporation 
                             ("PIC"), Pioneer Metals and 
                             Technology, Inc. ("PMT"), Pioneer 
                             First Russia, Inc., Pioneer Omega, 
                             Inc. 
</TABLE>

<TABLE>
<CAPTION>
                                                                           SHARES OF BENEFICIAL 
                                                                           INTEREST OF THE FUND 
                                                                          BENEFICIALLY OWNED AND 
       NAME, AGE,                PRINCIPAL OCCUPATION           FIRST       PERCENTAGE OF TOTAL 
  POSITION(S) WITH THE               OR EMPLOYMENT             BECAME A    SHARES OUTSTANDING ON 
    FUND AND ADDRESS       AND DIRECTORSHIPS/TRUSTEESHIPS(1)   TRUSTEE        MAY 30, 1997(2) 

                            ("OMEGA") AND THETA ENTERPRISES, 
                             INC. AND PIONEER INTERNATIONAL 
                             CORPORATION ("P.INTL.") LUSCINA, 
                             INC.; CHAIRMAN OF THE SUPERVISORY 
                             BOARD OF PIONEER FONDS MARKETING 
                             GMBH ("PIONEER GMBH"); MEMBER OF 
                             THE SUPERVISORY BOARD OF PIONEER 
                             FIRST POLISH TRUST FUND JOINT STOCK 
                             COMPANY, S.A. ("PFPT") AND PIONEER 
                             CZECH INVESTMENT COMPANY, A.S.; 
                             AND PARTNER, HALE AND DORR LLP 
<S>                        <C>                                 <C>         <C>
                             (Counsel to the Fund) 

MARY K. BUSH, [Age) ....   President, Bush & Co., a financing    1997               -0- 
  Trustee                    consulting firm, since 1991; 
  4201 Cathedral Ave. NW     Director/ Trustee of Mortgage 
  Apt. 1016E                 Guaranty Insurance Corporation, 
  Washington, DC 20016       Washington Mutual Investors Fund, 
                             a registered investment company, 
                             Novecon Management Company, 
                             Hoover Institution, Folger 
                             Shakespeare Library, March of 
                             Dimes, Project 2000, Inc., Small 
                             Enterprise Assistance Fund and 
                             Wilberforce University 
RICHARD H. EGDAHL, M.D.,   Professor of Management, Boston       1993              -0- 
  70                         University School of Management; 
  Trustee                    Professor of Public Health, Boston 
  Boston University          University School of Public 
  Health Policy Institute    Health; Professor of Surgery, 
  53 Bay State Road          Boston University School of 
  Boston, MA 02115           Medicine; Director, Boston 
                             University Health Policy 
                             Institute and University Medical 
                             Center; Executive Vice President 
                             and Vice Chairman of the Board, 
                             University Hospital; Academic 
                             Vice President for Health Affairs, 
                             Boston University; Director, 
                             Essex Investment Management 
                             Company, Inc., an investment 
                             adviser, Health Payment Review, 
                             Inc., a health care containment 
                             software firm, Mediplex Group, 
                             Inc., a nursing care facilities 
                             firm, Peer Review Analysis, Inc., 
                             a health care utilization 
                             management firm, and 
                             Springer-Verlag New York, Inc., a 
                             publisher; and Honorary Director, 
                             Franciscan Children's Hospital 
</TABLE>

<TABLE>
<CAPTION>
                                                                           SHARES OF BENEFICIAL 
                                                                           INTEREST OF THE FUND 
                                                                          BENEFICIALLY OWNED AND 
       NAME, AGE,                PRINCIPAL OCCUPATION           FIRST       PERCENTAGE OF TOTAL 
  POSITION(S) WITH THE               OR EMPLOYMENT             BECAME A    SHARES OUTSTANDING ON 
    FUND AND ADDRESS       AND DIRECTORSHIPS/TRUSTEESHIPS(1)   TRUSTEE        MAY 30, 1997(2) 
<S>                        <C>                                 <C>         <C>
MARGARET B.W. GRAHAM, 50   Founding Director, Winthrop Group,    1993               -0- 
  Trustee                    Inc., a consulting firm, since 
  The Keep                   1982; Manager of Research 
  P.O. Box 110               Operations, Xerox Palo Alto 
  Little Deer Isle,          Research Center, between 1991 and 
  ME 04650                   1994; and Professor of Operations 
                             Management and Management of 
                             Technology, Boston University 
                             School of Management, between 1989 
                             and 1993 
John W. Kendrick, 79 ...   Professor Emeritus of Economics,      1993              300 
  Trustee                    George Washington University; and                     (0.0)% 
  6363 Waterway Dr.          Economic Consultant and Director, 
  Falls Church, VA 22044     American Productivity and Quality 
                             Center 
Marguerite A. Piret, 49.   President, Newbury, Piret & Company,  1993              100 
  Trustee                    Inc., a merchant banking firm                         (0.0)% 
  One Boston Place 
  Suite 2635 
  Boston, MA 02108 
David D. Tripple, 53* ..   Director and Executive Vice           1993              100 
  Executive Vice President   President of PGI; President, Chief                    (0.0)% 
  and Trustee                Investment Officer and a Director 
  60 State Street            of PMC; Director of PFD, PCC, 
  Boston, MA 02109           Pioneer SBIC Corporation, Pioneer 
                             First Russia, Inc., Pioneer Omega, 
                             Inc., P. Intl. and PIC; and Member 
                             of the Supervisory Board of PFPT 
Stephen K. West, 68 ....   Partner, Sullivan & Cromwell, a law   1993              300 
  Trustee                    firm                                                  (0.0)% 
  125 Broad Street 
  New York, NY 10004 
John Winthrop, 61 ......   President, John Winthrop & Co., a     1993              101 
  Trustee                    private investment firm; Director                     (0.0)% 
  One North Adgers Wharf     of NUI Corp.; and Trustee of 
  Charleston, SC 29401       Alliance Capital Reserve, 
                             Alliance Government Reserve and 
                             Alliance Tax Exempt Reserve 
</TABLE>



 *  Messrs. Cogan and Tripple are "interested persons" of the Fund, PMC 
    and PFD within the meaning of the 1940 Act. 

(1) Each nominee also serves as a trustee for each of the 20 open-end 
   investment companies (mutual funds) in the Pioneer family of mutual 
   funds and for each of the eight portfolios of the Pioneer Variable 
   Contracts Trust (except Messrs. Kendrick and Winthrop and Mesdames 
   Bush and Graham who do not serve as Trustees for Pioneer Variable 
   Contracts Trust). Except for Ms. Bush who was elected by the other 
   Trustees in June, 1997, each Trustee was elected by the shareholders 
   of the Fund in 1996. 

(2) As of May 30, 1997, the Trustees and officers of the Fund beneficially 
   owned, directly or indirectly, in the aggregate less than 1% of the 
   Fund's outstanding shares. 

    Ms. Piret, Mr. West and Mr. Winthrop serve on the Audit Committee of 
the Board of Trustees. The functions of the Audit Committee include 
recommending independent auditors to the Trustees, monitoring the 
independent auditors' performance, reviewing the results of audits and 
responding to certain other matters deemed appropriate by the Trustees. 
Ms. Graham, Ms. Piret and Mr. Winthrop also serve on the Nominating 
Committee of the Board of Trustees. The primary responsibility of the 
Nominating Committee is the selection and nomination of candidates to 
serve as independent trustees. The Nominating Committee will also consider 
nominees recommended by shareholders to serve as Trustees provided that 
shareholders submitting such recommendations comply with all relevant 
provisions of Rule 14a-8 under the Securities Exchange Act of 1934, as 
amended (the "Exchange Act"). 

    During the fiscal year ended December 31, 1996, the Board of Trustees 
held     meetings, the Audit Committee held     meetings and the 
Nominating Committee          . All of the current Trustees and Committee 
Members then serving attended at least   % of the meetings of the Board of 
Trustees or applicable committee, if any, held during the fiscal year 
ended December 31, 1996. 

OTHER EXECUTIVE OFFICERS 

    In addition to Messrs. Cogan and Tripple, who serve as executive 
officers of the Fund, the following table provides information with 
respect to the other executive officers of the Fund. Each executive 
officer is elected by the Board of Trustees and serves until his successor 
is chosen and qualified or until his resignation or removal by the Board. 
The business address of all officers of the Fund is 60 State Street, 
Boston, Massachusetts 02109. 


<TABLE>
<CAPTION>
       NAME, AGE AND 
   POSITION WITH THE FUND                        PRINCIPAL OCCUPATION(S) 
<S>                                      <C>
WILLIAM H. KEOUGH, 60,.....              Senior Vice President, Chief Financial 
  Treasurer                               Officer and Treasurer of PGI and Treasurer 
                                          of PFD, PMC, PSC, PPC, Pioneer SBIC 
                                          Corporation, PIC, PMT, PIntl. and each 
                                          fund in the Pioneer family of mutual funds. 
Joseph P. Barri, 50,.......              Secretary of PGI, PMC, PPC, PIC, PIntl, PMT, 
  Secretary                               First Russia, Omega and PCC and each fund 
                                          in the Pioneer family of mutual funds; 
                                          Clerk of PFD and PSC and Partner, Hale 
                                          and Dorr LLP (counsel to the Fund). 
</TABLE>

REMUNERATION OF TRUSTEES AND OFFICERS 

    The following table provides information regarding the compensation 
paid by the Fund and the other investment companies in the Pioneer family 
of mutual funds to the Trustees for their services as indicated below. 
Compensation paid by 
the Fund to Messrs. Cogan and Tripple, interested persons of PMC, is 
reimbursed to the Fund by PMC. The Fund pays no salary or other 
compensation to its officers. 

<TABLE>
<CAPTION>
                                                              TOTAL COMPENSATION 
                                                                FROM THE FUND 
                                           AGGREGATE          AND OTHER FUNDS IN 
                                         COMPENSATION         THE PIONEER FAMILY 
             TRUSTEE                    FROM THE FUND+         OF MUTUAL FUNDS++ 
<S>                                     <C>                    <C>
John F. Cogan, Jr.                             $500                 $11,083 
Mary K. Bush*                                 -0-                    -0- 
Richard H. Egdahl, M.D.                       1,915                  59,858 
Margaret B.W. Graham                          2,015                  59,858 
John W. Kendrick                              2,015                  59,858 
Marguerite A. Piret                           2,316                  79,842 
David D. Tripple                                500                  11,083 
Stephen K. West                               2,142                  67,850 
John Winthrop                                 2,128                  66,442 
  Totals                                    $13,531               $415,874 
</TABLE>



+  For the fiscal year ended December 31, 1996. 

++ For the calendar year ended December 31, 1996. 

* Ms. Bush was first elected as a Trustee in June, 1997. 

INVESTMENT ADVISER 


    PMC, whose executive offices are located at 60 State Street, Boston, 
Massachusetts 02109, serves as investment adviser to the Fund. 

    PMC is a wholly owned subsidiary of PGI. As of May 30, 1997, Mr. Cogan 
beneficially owned      shares (  .  %) of the outstanding Common Stock of 
PGI. Mr. Cogan's beneficial holdings included      shares held in trusts 
with respect to which Mr. Cogan may be deemed to be a beneficial owner by 
reason of his interest as a beneficiary and/or position as a trustee and 
shares which Mr. Cogan has the right to acquire under outstanding options 
within sixty days of May 30, 1997. At such date, Robert L. Butler and 
David D. Tripple, PMC's other directors, each owned beneficially less than 
 % of the outstanding Common Stock of PGI. As of May 30, 1997 officers and 
directors of PMC and Trustees and officers of the Fund beneficially owned 
an aggregate of      shares of Common Stock of PGI, approximately   % of 
the outstanding common Stock of PGI. During PGI's fiscal year ended March 
31, 1997, there were no transactions in PGI Common Stock by any officer, 
Trustee or nominee for election as Trustee of the Fund, PMC and/or PFD in 
an amount equal to or exceeding   % of the outstanding Common Stock of 
PGI. 

REQUIRED VOTE 

    In accordance with the Fund's Agreement and Declaration of Trust, the 
vote of a plurality of all of the shares of the Fund voted at the Meeting 
is sufficient to elect the nominees. 

                                PROPOSAL 2. 
        RATIFICATION OF SELECTION OF INDEPENDENT PUBLIC ACCOUNTANTS 

    The firm of Arthur Andersen LLP has served as the Fund's independent 
public accountant since 1994. Audit services during the fiscal year ending 
December 31, 1997 will consist of examinations of the Fund's financial 
statements and reviews of the Fund's filings with the SEC. 

    The Board of Trustees, including a majority of the Trustees who are 
not "interested persons" of the Fund or PMC, has selected Arthur Andersen 
LLP as the Fund's independent public accountants for the fiscal year 
ending December 31, 1997, subject to shareholder ratification at the 
Meeting. A representative of Arthur Andersen LLP is expected to be 
available at the Meeting to make a statement if he or she desires to do so 
and to respond to appropriate questions. Arthur Anderson LLP has advised 
the Fund that it has no direct or indirect financial interest in the Fund. 

REQUIRED VOTE 

    The ratification of the selection of Arthur Andersen LLP as the Fund's 
independent public accountants for the fiscal year ending December 31, 
1997 requires the affirmative vote of a majority of the shares of the 
Fund, present in person or by proxy and entitled to vote at the Meeting. 

    THE TRUSTEES RECOMMEND THAT THE SHAREHOLDERS VOTE IN FAVOR OF THE 
RATIFICATION OF ARTHUR ANDERSEN LLP AS THE FUND'S INDEPENDENT PUBLIC 
ACCOUNTANTS FOR THE FISCAL YEAR ENDING DECEMBER 31, 1997. 

                               OTHER MATTERS 

SHAREHOLDER PROPOSALS 

     Shareholder  proposals to be presented at the next meeting of shareholders,
whenever held, must be received at the Fund's offices, 60 State Street,  Boston,
Massachusetts 02109, at a reasonable time prior to the Trustees' solicitation of
proxies for such  meeting and must  comply with the  requirements  of Rule 14a-8
under the  Exchange  Act.  The Fund  currently  expects to hold the next  annual
shareholders'  meeting  on or about  June 16,  1998,  which  date is  subject to
change. 

PROXIES, QUORUM AND VOTING AT THE MEETING

    Any person giving a proxy has the power to revoke it at any time prior 
to its exercise by executing a superseding proxy or by submitting a notice 
of revocation to the Secretary of the Fund. In addition, although mere 
attendance at the Meeting will not revoke a proxy, a shareholder present 
at the Meeting may withdraw his or her proxy and vote in person. All 
properly executed and unrevoked proxies received in time for the Meeting 
will be voted in accordance with the instructions contained in the 
proxies. If no instruction is given, the persons named as proxies will 
vote the shares represented thereby in favor of the Proposals described 
above and will use their best judgment in connection with the transaction 
of such other business as may properly come before the Meeting or any 
adjournment thereof. 

    A majority 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 (unless otherwise noted in the Proxy 
Statement). In the event that at the time any session of the Meeting is 
called to order and a quorum is not present in person or by proxy, the 
persons named as proxies may vote those proxies which have been received 
to adjourn such Meeting to a later date. In the event that a quorum is 
present at the Meeting but sufficient votes in favor of any Proposal, 
including the electing of the nominees to the Board of Trustees, have not 
been received, the persons named as proxies may propose one or more 
adjournments of such Meeting to permit further solicitation of proxies 
with respect to such Proposal. Any such adjournment will require the 
affirmative vote of a majority of the shares present in person or by proxy 
at the session of the Meeting to be adjourned. The persons named as 
proxies will vote those proxies which they are entitled to vote in favor 
of any such Proposal in favor of such adjournment and will vote those 
proxies required to be voted against any such Proposal against such 
adjournment. A shareholder vote may be taken on one or all of the 
Proposals prior to such adjournment if sufficient votes for the Proposal's 
approval have been received and it is otherwise appropriate. Such vote 
will be considered final regardless of whether the Meeting is adjourned to 
permit additional solicitation with respect to any other Proposal. 

    Shares of the Fund represented at the Meeting (including shares which 
abstain or do not vote with respect to one or more of the Proposals) will 
be counted for purposes of determining whether a quorum is present at the 
Meeting. Abstentions will be treated as shares that are present and 
entitled to vote for purposes of determining the number of shares that are 
present and entitled to vote with respect to any particular Proposal, but 
will not be counted as a vote in favor of such Proposal. Accordingly, an 
abstention from voting on a Proposal has the same legal effect as a vote 
against the Proposal. 

    If a broker or nominee holding shares in "street name" indicates on 
the proxy that it does not have discretionary authority to vote as to any 
Proposal, those shares will not be considered present and entitled to vote 
as to that Proposal. Accordingly, a "broker non-vote" has no effect on the 
voting in determining whether a proposal has been adopted. In general, 
brokers or nominees are given discretionary authority to vote shares held 
in street name with respect to the election of trustees/directors and the 
ratification of auditors. 

OTHER BUSINESS 

    While the Meeting has been called to transact any business that may 
properly come before it, the only matters that the Trustees intend to 
present are those matters stated in the attached Notice of Annual Meeting 
of Shareholders. However, if any additional matters properly come before 
the Meeting, and on all matters incidental to the conduct of the Meeting, 
it is the intention of the persons named in the enclosed proxy to vote the 
proxy in accordance with their judgment on such matters unless instructed 
to the contrary. 

METHODS OF SOLICITATION AND EXPENSES 

    The cost of preparing, assembling and mailing this proxy statement and 
the attached Notice of Annual Meeting of Shareholders and the accompanying 
proxy card will be borne by the Fund. In addition to soliciting proxies by 
mail, the Fund may, at its expense, have one or more of its officers, 
representatives or compensated third-party agents, including PMC, PSC and 
PFD, aid in the solicitation of proxies by personal interview or telephone 
and telegraph and may request brokerage houses and other custodians, 
nominees and fiduciaries to forward proxy soliciting materials to the 
beneficial owners of the shares held of record by such persons. 

    The Fund may also arrange to have votes recorded by telephone. The 
telephone voting procedure is designed to authenticate shareholders' 
identities, to allow shareholders to authorize the voting of their shares 
in accordance with their instructions and to confirm that their 
instructions have been properly recorded. The 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. The Fund is 
unaware of any such challenge at this time. Shareholders would be called 
at the phone number PSC 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. 

    Persons holding shares as nominees will be reimbursed by the Fund, 
upon request, for the reasonable expense of mailing soliciting materials 
to the principals of the accounts. 

                          PIONEER INTEREST SHARES 

July 18, 1997 



                    
<PAGE>



              VOTE THIS PROXY CARD TODAY! YOUR PROMPT RESPONSE WILL
                     SAVE THE  EXPENSE OF  ADDITIONAL  MAILINGS  
Please sign and return this proxy card in the enclosed envelope or mail to:
                             PIONEER INTEREST SHARES
                                 Proxy Tabulator
                                  P.O. Box 9138
                                Hingham, MA 02043

        Please fold and detach card at perforation before mailing

PIONEER INTEREST SHARES 60 STATE  STREET,
BOSTON, MASSACHUSETTS   02109

NOTICE OF  ANNUAL  MEETING  OF
SHAREHOLDERS  TO BE HELD  TUESDAY,  SEPTEMBER 16, 1997


The undersigned,  having received notice of the meeting and  management's  proxy
statement  therefor,  and revoking all prior proxies,  hereby appoint(s) John F.
Cogan,  Jr., David  D.Tripple,  Robert P. Nault and Joseph P. Barri, and each of
them,  attorneys or attorney of the undersigned (with full power of substitution
in them and each of them) for and in the  name(s) of the  undersigned  to attend
the Annual Meeting of Shareholders of Pioneer Interest Shares (the "Fund") to be
held on Tuesday, September 16, 1997 at 2:00 p.m. (Boston time) at the offices of
Hale and Dorr  LLP,counsel  to the Fund,  60 State Street,  26th Floor,  Boston,
Massachusetts  02109 (the  "Meeting"),  and any  adjourned  session or  sessions
thereof,  and there to vote and act upon the  following  matters  (as more fully
described in the  accompanying  Proxy Statement) in respect of all shares of the
Fund which the  undersigned  will be entitled to vote or act upon,  with all the
powers the undersigned would possess if personally present:

THIS  PROXY IS  SOLICITED  ON BEHALF OF THE  BOARD OF  TRUSTEES  OF THE FUND AND
SHOULD BE  RETURNED AS SOON AS POSSIBLE  IN THE  ENVELOPE  PROVIDED.  THE SHARES
REPRESENTED  BY THIS PROXY WILL BE VOTED AS DIRECTED BY THE  UNDERSIGNED.  IF NO
DIRECTION IS GIVEN, THIS PROXY WILL BE VOTED FOR THE PROPOSALS.

                                                DATED:..........., 199..


     In signing,  please write name(s) exactly as appearing hereon. When signing
     as attorney,  executor,  administrator or other fiduciary, please give your
     full title as such. Joint owners should each sign personally.


                                                  ..........................
                                                                    Signature(s)
                                                                             085
<PAGE>


              VOTE THIS PROXY CARD TODAY! YOUR PROMPT RESPONSE WILL
                    SAVE THE  EXPENSE OF  ADDITIONAL  MAILINGS  
Please  sign and  return this proxy card in the enclosed envelope or mail to:
                             PIONEER INTEREST SHARES
                                 Proxy Tabulator
                         P.O.Box 9138 Hingham, MA 02043

               Please fold and detach card at perforation before mailing

                   Please vote by filling in the boxes below.

     (1)  To elect the nine (9)Trustees to serve on the Board of Trustees until
          their  successors  have been duly elected and qualified.  The nominees
          are:
          
          John F.  Cogan,  Jr.,  Mary K. Bush,  Richard H.  Egdahl,  M.D.,
          Margaret B.W.Graham,  John W. Kendrick,  Marguerite A. Piret, David D.
          Tripple,  Stephen  K.  West  and  John  Winthrop.


FOR electing    |_|                      WITHHOLD  authority to vote   |_|
all the nominees                         for all nominees
(except as marked to the contrary)

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

 ..............................................


     (2)  To  ratify  the  selection  of  Arthur  Andersen  LLP  as  the  Fund's
          independent public accountants for the fiscal year ending December 31,
          1997;
     FOR    |_|                AGAINST    |_|        ABSTAIN  |_|

IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON SUCH OTHER BUSINESS
AS MAY PROPERLY COME BEFORE THE MEETING OR ANY ADJOURNMENT THEREOF.



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