PIONEER INTEREST SHARES
DEFS14A, 1999-05-12
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                                                  File No. 2-42352
                                                  File No. 811-2239
                                

                     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/

Filed by a Party other than the Registrant           / /
Check the appropriate box:
/ /      Preliminary Proxy Statement
/x/      Definitive Proxy Statement
/x/      Definitive Additional Materials
/ /      Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12
/ /      Confidential, for Use of the Commission Only
         (as permitted by Rule 14a-6(e) (2))

                             Pioneer Interest Shares

                (Name of Registrant as Specified in its Charter)



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

Payment of Filing Fee (Check the appropriate box):

/x/      No fee required.


<PAGE>                                                                        
                                                                   

                             PIONEER INTEREST SHARES
                                 60 State Street
                           Boston, Massachusetts 02109
                                 1-800-622-3265

                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

                           Scheduled for June 22, 1999

         This is the formal agenda for your fund's shareholder meeting. It tells
you the  matters  you will be  asked  to vote on and the  time and  place of the
meeting, in case you want to attend in person.

To the shareholders of Pioneer Interest Shares:

         A meeting of  shareholders  of your fund will be held at the offices of
Hale and Dorr  LLP,  60 State  Street,  26th  Floor,  Boston,  Massachusetts  on
Tuesday, June 22, 1999 at 2:00 p.m., Boston time, to consider the following:

         1.    A  proposal  to elect  the nine  (9)  trustees  named in the
               attached  proxy  statement to serve on the board of trustees
               until their successors have been duly elected and qualified.

         2.    A proposal to approve an amendment to your fund's fundamental
               investment  objective,  as described  in the attached  proxy
               statement.

         3.    A proposal to ratify the selection of Arthur Andersen LLP as
               the fund's  independent  public  accountants  for the fiscal
               year ending December 31, 1999.

         4.    Any other business that may properly come before the meeting.

         Shareholders  of record as of the close of  business  on April 26, 1999
are entitled to vote at the meeting and any related follow-up meetings.

                                            By order of the board of trustees,

                                            Joseph P. Barri, Secretary


Boston, Massachusetts
May 7, 1999

Whether or not you expect to attend the meeting,  please complete and return the
enclosed proxy card. If  shareholders  do not return their proxies in sufficient
numbers,  your  fund  will  incur  the  cost of  extra  solicitations,  which is
indirectly borne by you and other shareholders.




<PAGE>




                                                                              

                               PROXY STATEMENT OF
                             PIONEER INTEREST SHARES
                                 60 State Street
                           Boston, Massachusetts 02109
                                 1-800-622-3265

                         ANNUAL MEETING OF SHAREHOLDERS

         This proxy  statement  contains the  information you should know before
voting on the proposals as summarized below.

Pioneer  Interest Shares will furnish without charge a copy of its annual report
to any shareholder  upon request.  Shareholders who want to obtain a copy of the
fund's annual report should direct all written  requests to the attention of the
fund,  at  the  address  listed  above,  or  should  call  Pioneering   Services
Corporation at 1-800-225-6292.

                                  INTRODUCTION

This  proxy  statement  is being used by the board of  trustees  of your fund to
solicit  proxies to be voted at the annual meeting of shareholders of your fund.
This meeting will be held at the offices of Hale and Dorr LLP, 60 State  Street,
26th Floor,  Boston,  Massachusetts 02109, at 2:00 p.m., Boston time on Tuesday,
June 22,  1999,  and at any  adjournments  of the meeting to a later  date.  The
purpose of this meeting is to consider:

         1.    A  proposal  to  elect  the nine (9)  trustees  named  under
               Proposal  1 to serve on the board of  trustees  until  their
               successors have been duly elected and qualified.

         2.    A proposal to approve  amendments to your fund's fundamental
               investment objective, as described under Proposal 2.

         3.    A proposal to ratify the selection of Arthur Andersen LLP as
               the fund's  independent  public  accountants  for the fiscal
               year ending December 31, 1999.

         4.    Any other business that may properly come before the meeting.

This proxy  statement  and proxy are being  mailed to  shareholders  on or about
May 7,  1999.  The  annual  report  for the fund for the  fiscal  year  ended
December 31, 1998, was previously mailed to shareholders.

Who is Eligible to Vote?

         Shareholders of record of the fund as of the close of business on April
26, 1999 (the "record date") are entitled to vote on all of the fund's  business
at the meeting or any adjournments  thereof. Each share is entitled to one vote.
Shares represented by properly executed proxies, unless revoked before or at the
meeting,  will be voted according to shareholders'  instructions.  If you sign a
proxy,  but do not fill in a vote,  your  shares  will be voted to  approve  the
proposals.  If any other business comes before the meeting,  your shares will be
voted at the discretion of the persons named as proxies.



<PAGE>


                                   PROPOSAL 1

                          ELECTION OF BOARD OF TRUSTEES

         All of the nominees for election  currently  serve as trustees for your
fund.  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 in this proxy  statement and indicated his
or her  willingness  to serve if  elected.  If any  nominee  should be unable to
serve, an event which is not anticipated,  the persons named as proxies may vote
for such other  person as shall be  designated  by the board of  trustees of the
fund.  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.

         The  following  table sets forth each  nominee's  position(s)  with the
fund, and their age,  address,  principal  occupation and employment  during the
past five years and any other  directorships  held. The table also indicates the
year during which he or she first became a trustee of the fund and the number of
shares of the fund beneficially  owned by each nominee,  directly or indirectly,
on April 9, 1999.
<TABLE>
<S>                             <C>                                            <C>               <C>

 Name, age, position(s) with       Principal occupation or employment and      First became a    Number of shares
    the fund and address                      trusteeships(1)                      trustee           owned and
                                                                                                   percentage of
                                                                                                   total shares
                                                                                                  outstanding on
                                                                                                  April 9, 1999

JOHN F. COGAN, JR.* (72)       President, Chief Executive Officer and a             1993          1,000/0.01%
Chairman of the Board,         Director of The Pioneer Group, Inc. ("PGI");
President and Trustee          Chairman and a Director of Pioneer Investment
60 State Street                Management, Inc. ("Pioneer") and Pioneer Funds
Boston, MA  02109              Distributor, Inc. ("PFD"), Pioneer Goldfields
                               Limited, Teberebie Goldfields Limited, Closed
                               Joint-Stock Company "Amgun-Forest," Closed
                               Joint-Stock Company "Udinskoye" and Closed
                               Joint-Stock Company "Tas-Yurjah" Mining Compnay;
                               Director of Pioneering Services Corporation
                               ("PSC"), Pioneer Real Estate Advisors, Inc.,
                               Pioneer Forest, Inc., Pioneer Explorer, Inc.,
                               Pioneer Management (Ireland) Ltd. ("PMIL"),
                               Pioneer First Investment Fund and Closed Joint
                               Stock Company "Forest-Starma"; President and
                               Director of Pioneer Metals and Technology, Inc.
                               ("PMT"), Pioneer International Corp. ("Pintl"),
                               Pioneer First Russia, Inc. and Pioneer Omega,
                               Inc. ("Pioneer Omega"); Chairman of the
                               Supervisory Board of Pioneer Fonds Marketing,
                               GmbH, Pioneer First Polish Investment Fund Joint
                               Stock Company, S.A. ("Pioneer First Polish") and
                               Pioneer Czech Investment Company, A.S. ("Pioneer
                               Czech"); Member of the Supervisory Board of
                               Pioneer Unviersal Pension Fund Company; Chairman,
                               President and Trustee of all of the Pioneer
                               mutual funds; Director of Pioneer Global Equity
                               Fund Plc, Pioneer Global Bond Fund Plc, Pioneer
                               Euro Reserve Fund Plc, Pioneer European Equity
                               Fund Plc, Pioneer Emerging Europe Fund Plc,
                               Pioneer US Real Estate Fund Plc and Pioneer U.S.
                               Growth Fund Plc (collectively, the "Irish
                               Funds"); and Partner, Hale and Dorr LLP (counsel
                               to PGI and the fund).

MARY K. BUSH                   President, Bush & Co. (international                 1997              0
(51)                           financial advisory firm); Director and/or
Trustee                        Trustee of Mortgage Guaranty Insurance
4201 Cathedral Ave. NW         Corporation, Novecon Management Company,
Washington, DC  20016          Hoover Institution, Folger Shakespeare

                               Library, March of Dimes, Project 2000, Inc.
                               (not-for-profit educational organization),
                               Wilberforce University and Texaco, Inc.; Advisory
                               Board Member, Washington Mutual Investors Fund
                               (registered investment company); and Trustee of
                               all the Pioneer mutual funds, except Pioneer
                               Variable Contracts Trust.

RICHARD H. EGDAHL, M.D.        Alexander Graham Bell Professor of Health            1993          1,000/0.01%
(72)                           Care Entrepreneurship, Boston University;
Trustee                        Professor of Management, Boston University
Boston University Health       School of Management; Professor of Public
Policy Institute               Health; Boston University School of Public
53 Bay State Road              Health; Professor of Surgery, Boston
Boston, MA  02215              University School of Medicine, University
                               Program  for Health Care  Entrepreneurship,  CORE
                               (management   of   workers'    compensation   and
                               disability costs - Nasdaq National  Market),  and
                               WellSpace   (provider  of  complementary   health
                               care); Trustee,  Boston Medical Center;  Honorary
                               Trustee,   Franciscan  Children's  Hospital;  and
                               Trustee of all of the Pioneer mutual funds.

MARGARET B.W. GRAHAM           Founding Director, The Winthrop Group, Inc.          1993            100/0.00%
(51)                           (consulting firm); Manager of Research
Trustee                        Operations, Xerox Palo Alto Research Center,
The Keep                       from 1991 to 1994; Professor of Operations
P.O. Box 110                   Management and Management of Technology and
Little Deer Isle, ME  04650    Associate Dean, Boston University School of
                               Management, from 1989 to 1993; and Trustee of all
                               the Pioneer mutual funds, except Pioneer Variable
                               Contracts Trust.

JOHN W. KENDRICK               Professor Emeritus, George Washington                1993            300/0.00%
(81)                           University; Director, American Productivity
Trustee                        and Quality Center; Adjunct Scholar, American
636 Waterway Drive             Enterprise Institute; Economic Consultant;
Falls Church, VA 22044         and Trustee of all of the Pioneer mutual
                               funds, except Pioneer Variable Contracts Trust

MARGUERITE A. PIRET            President Newbury, Piret & Company, Inc.             1993            100/0.00%
(50)                           (merchant banking firm); Trustee of Boston
Trustee                        Medical Center; Member of the Board of
One Boston Place               Governors of the Investment Company
26th floor                     Institute; Director, Organogenesis Inc. (tissue
Boston, MA  02108              engineering company); and Trustee of all of the
                               Pioneer mutual funds.

DAVID D. TRIPPLE*              Executive Vice President and a Director of           1993            100/0.00%
(55)                           PGI; President and a Director of Pioneer and
Executive Vice President and   PFD; Director of Pintl, PREA, Pioneer 
Trustee                        Omega, PMIL, Pioneer First Investment Fund
60 State Street                and the Irish Funds; Member of the Supervisory
Boston, MA  02109              Board of Pioneer First Polish and Pioneer Czech;  
                               and Executive Vice President and Trustee of all
                               of the Pioneer mutual funds.

STEPHEN K. WEST                Of Counsel, Sullivan & Cromwell (law firm);          1993            300/0.00%
(70)                           Director, Kleinwort Benson Australian Income
Trustee                        Fund, Inc., The Swiss Helvetia Fund, Inc.
125 Broad Street               (mutual funds), AMVESCAP PLC (investment
New York, NY  10004            managers) and American Insurance Holdings,
                               Inc.;  Trustee,  The Winthrop Focus Funds (mutual
                               funds);  and Trustee of all of the Pioneer mutual
                               funds.

JOHN WINTHROP                  President, John Winthrop & Co., Inc. (private        1993            101/0.00%
(62)                           investment firm); Director of NUI Corp.
Trustee                        (energy sales, services and distribution);
One North Adgers Wharf         and Trustee of all of the Pioneer mutual
Charleston, SC 29401           funds; except Pioneer Variable Contracts
                               Trust.
</TABLE>
*        Messrs.  Cogan and  Tripple  are  "interested  persons" of the fund and
         Pioneer  within  the  meaning  of Section  2(a)(19)  of the  Investment
         Company Act of 1940 (the "1940 Act").

(1)      Each  nominee  also  serves  as a  trustee  for  each  of the  open-end
         investment  companies  (mutual  funds) in the Pioneer  family of mutual
         funds and for each of the twelve  portfolios  of the  Pioneer  Variable
         Contracts Trust (except Messrs.  Kendrick and Winthrop and Mmes. Graham
         and Bush, who do not serve as trustees for Pioneer  Variable  Contracts
         Trust).  Each trustee was most recently  elected by the shareholders of
         the fund in 1998.

(2)      As of April 9,  1999,  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, 1998,  the board of trustees
held 12 meetings,  the audit  committee  held 12  meetings and the nominating
committee  held 0 meetings.  All of the current  trustees  and  committee
members  then  serving  attended  at least 75% of the  meetings  of the board of
trustees  or  applicable  committee,  if any,  held during the fiscal year ended
December 31, 1998.

         Mr.  Cogan is an officer of Pioneer and owns,  as of March 31,  1999,
approximately 13.56% of the outstanding Common Stock of PGI. None of the other
nominees own more than of the outstanding Common Stock of PGI. 

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>
<S>                                                         <C>

Name, Age And Position With The Fund                        Principal Occupation(s)
JOHN A. BOYNTON, (44), Treasurer                            Executive Vice President, Treasurer and Chief
                                                            Financial Officer of PGI; and Treasurer of Pioneer, PFD,
                                                            PSC, PIntl, PREA, Pioneer Omega and all
                                                            of the Pioneer mutual funds.  Prior to joining PGI in
                                                            November 1998, Mr. Boynton was a Senior Vice President
                                                            of The Quaker Oats Company.
JOSEPH P. BARRI, (52), Secretary                            Corporate Secretary of PGI and most of its
                                                            subsidiaries; Secretary of all of the Pioneer mutual
                                                            funds; and Partner, Hale and Dorr LLP.
ERIC W. RECKARD, (42), Assistant Treasurer                  Vice President-Corporate Finance since February 1999;
                                                            Manager of Business Planning and Internal Audit of PGI
                                                            since September 1996; Manager of Fund Accounting of
                                                            Pioneer since May 1994; Manager of Auditing,
                                                            Compliance and Business Analysis for PGI prior to May
                                                            1994; and Assistant Treasurer of all of the Pioneer
                                                            mutual funds.
ROBERT P. NAULT, (34), Assistant Secretary                  Senior Vice President, General Counsel and Assistant
                                                            Secretary of PGI since 1995; Assistant Secretary of
                                                            Pioneer, certain other PGI subsidiaries and all of the
                                                            Pioneer mutual funds; Assistant Clerk of PFD and PSC;
                                                            and junior partner of Hale and Dorr LLP prior to 1995.
</TABLE>

Section 16(a) Beneficial Ownership Reporting Compliance

         Under the Securities  Exchange Act and the Rules  thereunder,  officers
and  turstees  of  closed-end  investment  compnaies  are  required  to  report
transactions  in a fund's shares to the  Securities  and Exchange  Commission on
various  specified  forms.  A report  on Form 3 was not  timely  filed  with the
Commission with respect to Mr. Boynton's initial  ownership report.  The untiely
filing of the Form 3 was inadvertent and the subject transaction does not reaise
concerns under Section 16 of the Exchange Act.

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,  who are  interested  persons of
Pioneer, is reimbursed to the fund by Pioneer.  The fund pays no salary or other
compensation of its officers.
<TABLE>
<S>                          <C>                         <C>
Trustee                      Aggregate compensation      Total Compensation from the fund
                                     from the fund+        and other funds in the Pioneer
                                                               family of mutual funds++

John F. Cogan, Jr.                     $    750*                          $ 18,750*
Mary K. Bush                              2,353                             77,125
Richard H. Egdahl, M.D.                   2,352                             79,125
Margaret B.W. Graham                      2,380                             81,750
John W. Kendrick                          1,898                             65,900
Marguerite A. Piret                       2,566                             98,750
David D. Tripple                            750*                            18,750*
Stephen K. West                           2,337                             85,050
John Winthrop                             2,527                             85,875
                                          -----                             ------

  Totals                               $ 17,913                           $611,075
                                        =========                         ========

</TABLE>
*        Pioneer fully reimbursed the fund and the other mutual funds in the
         Pioneer family of mutual funds for
         compensation paid to Messrs. Cogan and Tripple.

+        For the fiscal year ended December 31, 1998.

++       For the calendar year ended December 31, 1998.

Investment Adviser

         Pioneer and Pioneer Funds  Distributor,  Inc., whose executive  offices
are located at 60 State Street, Boston, Massachusetts 02109, serve as investment
adviser and principal underwriters, respectively, to the fund.

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.  This  means  that  the  nine (9)  nominees
receiving the greatest number of votes will be elected to the board.





<PAGE>


                                   PROPOSAL 2

                       AMENDMENT TO THE FUND'S FUNDAMENTAL

INVESTMENT OBJECTIVE

         Pioneer and your fund's  board of trustees  recommend  that your fund's
fundamental  investment  objective  be amended to  eliminate  the phrase  "which
management  considers to be of  high-quality."  The purpose of this change is to
clarify your fund's existing investment  objective and avoid potential ambiguity
caused by the use of the term  "high-quality."  The board is concerned  that the
use of "high quality" in the fund's objective may cause some investors to assume
that it has a policy to invest primarily in debt securities rated AAA or better.
Since the fund's organization,  the term "high quality" frequently has been used
to describe a portfolio  that is limited to debt instruments in the two or three
highest rating  categories.  The fund has been authorized since its organization
to invest without limit in bonds that are rated investment grade by a nationally
recognized statistical rating organization, and up to 20% of its assets in bonds
that are rated  below  investment  grade or  unrated.  While the  fund's  rating
criteria have always been primarily  disclosed to investors,  the board believes
that it is  appropriate  to remove this  potentially  confusing  reference.  The
proposed  change will not alter your fund's range of permissible  investments or
its investment focus, but merely will restate its investment objective to better
reflect the existing range.

     Current Investment Objective       Proposed  Investment  Objective
     To seek interest  income  by       To seek interest income by investing in
     investing  in  a diversified       a diversified portfolio of debt
     portfolio  of  debt  obligations   obligations, primarily investment grade,
     which management considers to be   with the objective of obtaining as high
     of high quality, with the          a yield as possible consistent with
     objective of obtaining as high     this type of investment.
     a yield as possible consisstent
     with this type of investment.
           
Voting Rights and Required Vote

         Approval of proposal 2 requires the  affirmative  vote of a majority of
the shares of your fund  outstanding  and entitled to vote. For this purpose,  a
majority of the outstanding shares of your fund means the vote of the lesser of:

         (1)        67% or more of the  shares  present  at the  meeting, if the
                    holders  of  more  than  50% of  the shares  of the fund are
                    present or represented by proxy, or

         (2)        more than 50% of the outstanding shares of the fund.

Board Evaluation and Recommendation

         The  trustees  believe  that the  proposed  amendments  to your  fund's
fundamental  investment  objective will more clearly reflect the fund's range of
permissible  investments.  Accordingly,  the trustees recommend that you approve
the  proposal  to change the  objective  as  described  above.  If the  required
approval of this change is not obtained,  the current  objective  will remain in
effect.

         The trustees of your fund recommend that the  shareholders of your fund
vote FOR the proposal to amend the fund's investment objective.
                                   PROPOSAL 3

                          RATIFICATION OF SELECTION OF
                         INDEPENDENT PUBLIC ACCOUNTANTS

         The firm of Arthur  Andersen LLP has served as your fund's  independent
public  accountants  since 1994.  Audit  services  during the fiscal year ending
December  31,  1999  will  consist  of  examinations  of  the  fund's  financial
statements  and reviews of the fund's  filings with the  Securities and Exchange
Commission.

         The fund's board of trustees,  including a majority of the trustees who
are not  "interested  persons"  of the  fund or  Pioneer,  has  selected  Arthur
Andersen LLP as the fund's  independent  public  accountants for the fiscal year
ending December 31, 1999, 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  Andersen  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 your fund's
independent  public  accountants  for the fiscal year ending  December  31, 1999
requires the affirmative vote of a majority of the shares of your fund,  present
in person or by proxy and entitled to vote at the meeting.

Recommendation

         The trustees of your fund recommend that the  shareholders of your fund
vote FOR the  ratification  of Arthur  Andersen  LLP as your fund's  independent
public accountants for the fiscal year ending December 31, 1999.

                       INFORMATION CONCERNING THE MEETING


Outstanding shares and quorum

         As of the record date,  7,395,024 shares of beneficial interest of
the fund were outstanding. Only shareholders of record as of the record date are
entitled to notice of and to vote at the meeting.  A majority of the outstanding
shares of the fund that are entitled to vote will be considered a quorum for the
transaction of business.

Ownership of shares of the fund

         To the  knowledge of the fund,  as of the record date, no persons owned
of  record  or  beneficially  5% or more of the  outstanding  shares of the fund
except  that  Cede  and  Co.,  Box 20,  Bowling  Green  Station,  New  York,  NY
10004-0001,  held 5,062,022 shares  as  nominee.  

         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 the meeting and must comply with the requirements of
Rule 14a-8 under the  Securities  and Exchange Act of 1934.  The Fund  currently
expects to hold the next annual shareholders' meeting on or about June 20, 2000,
which date is subject to change.


Shares held in retirement plans

         PGI, as trustee or custodian of certain  retirement plans, is permitted
to vote any shares  held in such plans and will do so if  necessary  to obtain a
quorum.

Proxies, quorum and voting at the meeting

         Any shareholder who has given his or her proxy to someone has the power
to  revoke  that  proxy  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 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 the meeting to a later
date. In the event that a quorum is present but sufficient votes in favor of any
of the  proposals,  including  the  election  of the  nominees  to the  board of
trustees,  have not been received,  the persons named as proxies may propose one
or more  adjournments  of the meeting to permit further  solicitation of proxies
with respect to such proposal. Any such adjournment will require the affirmative
vote of more than one half of the  shares of the trust  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 an  adjournment  and will  vote  those  proxies
required to be voted against any such proposal against any such  adjournment.  A
shareholder  vote  may be  taken on one or more of the  proposals  in the  proxy
statement  prior to such  adjournment if sufficient  votes for its 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 your fund represented in person or by proxy, including shares
which  abstain or do not vote with  respect to a  proposal,  will be counted for
purposes of determining  whether there is a quorum at the meeting.  Accordingly,
an abstention from voting has the same effect as a vote against a proposal.

         However,  if a broker  or  nominee  holding  shares  in  "street  name"
indicates  on the proxy card that it does not have  discretionary  authority  to
vote on a proposal,  those shares will not be considered present and entitled to
vote on that proposal.  Thus, a "broker non-vote" has no effect on the voting in
determining  whether a  proposal  has been  adopted by 67% or more of the shares
present at the meeting,  if more than 50% of the outstanding  shares  (excluding
the "broker  non-votes")  are present or represented.  However,  for purposes of
determining  whether  a  proposal  has  been  adopted  by more  than  50% of the
outstanding  shares of the fund,  a "broker  non-vote"  has the same effect as a
vote against that proposal because shares represented by a "broker non-vote" are
considered to be outstanding shares.

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.

Method 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,
Pioneer  may, at  the fund's  expense, have one or more of the fund's  officers,
representatives or compensated  third-party agents,  including Pioneer,  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 material to the beneficial owners of the
shares held in 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. 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 the
transfer agent, Chase Mellon Shareholder Services,  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 Pioneer,  upon
request,  for the  reasonable  expenses of mailing  soliciting  materials to the
principals of the accounts.



May 7, 1999
<PAGE>
(Horizontal layout)
                                                            
PROXY                                                                      PROXY

                             PIONEER INTEREST SHARES

                  PROXY FOR THE SPECIAL MEETING OF SHAREHOLDERS
                        To be held Tuesday, June 22, 1999

          I (we),  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, my (our)  attorneys  (with full power of  substitution in them and each of
them) for and in my (our) name(s) to attend the Annual  Meeting of  Shareholders
of Pioneer Interest Shares, a Delaware business trust (the "Fund") to be held on
Tuesday,  June 22, 1999,  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,  and  any  adjourned  session  or  sessions  thereof  (the
"Meeting"),  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 I (we) will be  entitled  to vote or act upon,  with all the powers I
(we) would possess if personally present.

THE  SHARES  REPRESENTED  BY  THIS  PROXY  WILL  BE  VOTED  AS YOU DIRECT. IF NO
DIRECTION IS GIVEN, THIS PROXY WILL BE VOTED FOR THE PROPOSAL(S).

                                   Note: Please complete,  sign, date and return
                                   this proxy in the  enclosed  envelope as soon
                                   as possible. Please sign exactly as your anme
                                   or  names  appear  hereon.  When  signing  as
                                   attorney,   executor,  administrator or other
                                   fiduciary,  please  give your  full  title as
                                   such.    Joint   owners   should  each   sign
                                   personally.
     


                                   -----------------------------------------
                                   Signature of Shareholder(s)

                                   -----------------------------------------
                                   Signature of Joint Shareholder(s) (if any)

                                   -----------------------------------, 1999
                                   Date

                                   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.
<PAGE>    
[REVERSE OF CARD]

THIS  PROXY IS  SOLICITED  ON BEHALF OF THE BOARD OF  TRUSTEES  OF YOUR FUND AND
SHOULD BE RETURNED AS SOON AS POSSIBLE IN THE ENVELOPE PROVIDED

1.  To elect Trustees the (9) trustees to serve on the board of trustess
    until their successors have been duly elected and qualified. The nominees
    are:

         Mary K. Bush, John F. Cogan, Jr., 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 all nominees         WITHHOLD           FOR all nominees (except 
                                 for all nominees    as marked to the contrary)
             [  ]                   [  ]                  [  ]

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

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

2.   To  approve amendments to your fund's fundamental investment objective,  as
     described in the attached proxy statement:

                  0 FOR             0 AGAINST                 0 ABSTAIN

3.   To  ratify the selection of Arthur  Andersen LLP as the Fund's  independent
     public accountants for the fiscal year ending December 31, 1999:

                  0 FOR             0 AGAINST                 0 ABSTAIN


IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON SUCH OTHER BUSINESS
AS MAY PROERLY COME BEFORE THE MEETING.

<PAGE>

Pioneer Interest Shares
60 State Street
Boston, MA 02109-1820

May 1999

Dear Shareowner,

I am writing to let you know that the annual meeting for shareowners of Pioneer
Interest Shares will be held June 22, 1999. As a shareowner in the Fund, you
have the opportunity to voice your opinion on a number of important proposals.

This package contains information about the proposals, along with the proxy card
for you to use when voting by mail. Please take a moment to read the enclosed
materials and cast your vote on the proxy card.

Your prompt vote will help save the Fund money. If a majority of the Fund's
shareowners have not voted prior to the meeting, we must try to obtain their
votes with additional mailings or phone solicitation. That is a costly process.

(callout in margin) VOTING YOUR SHARES BY MAIL IS QUICK AND EASY. EVERYTHING YOU
NEED IS ENCLOSED.

Each of the proposals up for approval has been reviewed by Pioneer Interest
Shares' Board of Trustees, whose primary role is to protect your interests as a
shareowner. In the Trustees' opinion, the proposals are fair and reasonable. The
Trustees recommend that you vote FOR each proposal.

(callout in margin) THE FUND'S BOARD OF TRUSTEES RECOMMENDS THAT YOU VOTE FOR
EACH PROPOSAL.

HERE IS WHAT A FOR VOTE MEANS FOR EACH OF THE PROPOSALS BEING CONSIDERED.

PROPOSAL 1:
ELECT NINE TRUSTEES TO THE BOARD. The Trustees supervise the Fund's activities
and review contractual arrangements with companies that provide services to the
Fund. All of the nominees previously were elected by shareowners. The proxy
statement includes detailed information about all nominees.

PROPOSAL 2:
AMEND THE LANGUAGE IN THE FUND'S FUNDAMENTAL INVESTMENT OBJECTIVE. The proposed
change will not alter the Fund's range of permissible investments or its
investment focus, but merely restate its investment objective to better reflect
the existing range. The phrase "which management considers to be of
high-quality" will be eliminated to clarify the existing investment objective
and avoid potential ambiguity caused by the use of the term "high quality."

PROPOSAL 3:
RATIFY THE SELECTION OF ARTHUR ANDERSEN LLP AS THE FUND'S INDEPENDENT PUBLIC
ACCOUNTANTS FOR THE FISCAL YEAR ENDING DECEMBER 31, 1999.

Cast your vote by completing and signing the proxy card enclosed in this
package. Please mail your completed and signed proxy card as quickly as
possible, using the postage-paid envelope provided. Thank you for your prompt
response.

(callout in margin) PLEASE VOTE! YOUR VOTE IS EXTREMELY IMPORTANT, NO MATTER HOW
MANY SHARES YOU OWN.

Sincerely,

John F. Cogan, Jr.
Chairman and President

0499-6477

<PAGE>
URGENT
PLEASE VOTE YOUR SHARES TODAY

Dear Shareowner,

Not too long ago we sent you a proxy card and materials for Pioneer Interest
Shares (the Fund) explaining the proposals up for a vote at the June 22, 1999
shareowner meeting. WE NEED YOU TO CAST YOUR VOTE!

If you have not already completed and returned the proxy card included in our
earlier package, PLEASE TAKE A MOMENT NOW TO COMPLETE THE ENCLOSED PROXY CARD
AND MAIL IT TO US IN THE POSTAGE-PAID ENVELOPE PROVIDED.

The proposals in the Proxy Statement have been reviewed by the Fund's Board of
Trustees, whose primary role is to protect your interests as a shareowner. In
the Trustees' opinion, the proposals are fair and reasonable. The Trustees
recommend that you vote FOR each proposal. For your easy reference, on the back
of this page is a summary of what a FOR vote would mean for each proposal.

PLEASE VOTE! YOUR VOTE IS EXTREMELY IMPORTANT, NO MATTER HOW MANY SHARES YOU
OWN.

Thank you for your prompt response.

Sincerely,

John F. Cogan, Jr.
Chairman and President



<PAGE>



Here is what a FOR vote means for each of the proposals being considered.

PROPOSAL 1:
ELECT NINE TRUSTEES TO THE BOARD. The Trustees supervise the Fund's activities
and review contractual arrangements with companies that provide services to the
Fund. All of the nominees previously were elected by shareowners. The proxy
statement includes detailed information about all nominees.

PROPOSAL 2:
AMEND THE LANGUAGE IN THE FUND'S FUNDAMENTAL INVESTMENT OBJECTIVE. The proposed
change will not alter the Fund's range of permissible investments or its
investment focus, but merely restate its investment objective to better reflect
the existing range. The phrase "which management considers to be of
high-quality" will be eliminated to clarify the existing investment objective
and avoid potential ambiguity caused by the use of the term "high quality."

PROPOSAL 3:
RATIFY THE SELECTION OF ARTHUR ANDERSEN LLP AS THE FUND'S INDEPENDENT PUBLIC
ACCOUNTANTS FOR THE FISCAL YEAR ENDING DECEMBER 31, 1999.

PLEASE VOTE! YOUR VOTE IS EXTREMELY IMPORTANT, NO MATTER HOW MANY SHARES YOU
OWN.











0499-6476









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