FORM OF FEE WAIVER AGREEMENT

     THIS FEE WAIVER AGREEMENT (the "Agreement") is entered into as of the [ ]
day of [ ] 2007, between Pioneer Bond Fund (the "Fund") and Pioneer Investment
Management Shareholder Services, Inc., the Fund's shareholder servicing and
transfer agent ("PIMSS").

     WHEREAS, the Fund and PIMSS are parties to a Master Investment Company
Service Agreement, dated as of March 4, 2003, as amended from time to time (the
"Service Agreement"), pursuant to which the PIMSS is entitled to receive a fee
for its services thereunder.

     WHEREAS, under the terms of the Service Agreement with the Fund, PIMSS'
duties include: (i) processing sales, redemptions and exchanges of shares of the
Fund; (ii) distributing dividends and capital gains associated with the Fund's
portfolio; and (iii) maintaining account records and responding to shareholder
inquiries.

     WHEREAS, in connection with, and contingent upon the approval and
completion of, the proposed reorganization of Pioneer Interest Shares into
Pioneer Bond Fund's Class Y shares, PIMSS desires to waive all of its fees
applicable to Pioneer Bond Fund's Class Y shares for the period specified below.

     NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements herein contained, and for other good and valuable
consideration, the receipt and adequacy of which are hereby acknowledged, each
of the parties hereto agrees as follows:

     1.  Waiver of Fee; Duration. PIMSS hereby agrees to waive all of its fees
pursuant to the Service Agreement applicable to Pioneer Bond Fund's Class Y
shares. This Agreement shall be effective only if shareholders of Pioneer
Interest Shares approve the proposed reorganization into Pioneer Bond Fund in
exchange for Class Y shares of Pioneer Bond Fund, and shall be effective upon
the closing of the reorganization through November 1, 2008.

     2.  Expense Reimbursement. PIMSS agrees that it shall not be entitled to be
reimbursed for any expenses that PIMSS has waived or limited pursuant to this
Agreement.

     3.  Governing Law. This Agreement shall be construed and enforced in
accordance with, and the rights of the parties shall be governed by, the laws of
The Commonwealth of Massachusetts, without giving effect to the principles of
conflicts of laws thereof.


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         IN WITNESS WHEREOF, the Fund and PIMSS have agreed to this Agreement as
of the day and year first set forth above.


                                           PIONEER BOND FUND


                                           By:
                                           Name:
                                           Title:


                                           PIONEER INVESTMENT MANAGEMENT
                                           SHAREHOLDER SERVICES, INC.


                                           By:
                                           Name:
                                           Title: