PIONEER BOND FUND

                   Multiple Class Plan Pursuant to Rule 18f-3

                Class A Shares, Class B Shares and Class C Shares
                                  October 2001

         Each class of shares of Pioneer Bond Fund (the "Fund") will have the
same relative rights and privileges and be subject to the same sales charges,
fees and expenses, except as set forth below. The Board of Trustees may
determine in the future that other distribution arrangements, allocations of
expenses (whether ordinary or extraordinary) or services to be provided to a
class of shares are appropriate and amend this Plan accordingly without the
approval of shareholders of any class. Except as set forth in the Fund's
prospectus(es), shares may be exchanged only for shares of the same class of
another Pioneer mutual fund.

         Article I.  Class A Shares

         Class A Shares are sold at net asset value and subject to the initial
sales charge schedule or contingent deferred sales charge ("CDSC") and minimum
purchase requirements as set forth in the Fund's prospectus. Class A Shares
shall be entitled to the shareholder services set forth from time to time in the
Fund's prospectus with respect to Class A Shares. Class A Shares are subject to
fees calculated as a stated percentage of the net assets attributable to Class A
Shares under the Fund's Class A Rule 12b-1 Distribution Plan as set forth in
such Distribution Plan. The Class A Shareholders have exclusive voting rights,
if any, with respect to the Class A Rule 12b-1 Distribution Plan. Transfer
agency fees are allocated to Class A Shares on a per account basis except to the
extent, if any, such an allocation would cause the Fund to fail to satisfy any
requirement necessary to obtain or rely on a private letter ruling from the
Internal Revenue Service ("IRS") relating to the issuance of multiple classes of
shares. Class A Shares shall bear the costs and expenses associated with
conducting a shareholder meeting for matters relating to Class A Shares.

         The initial purchase date for Class A Shares acquired through (i)
reinvestment of dividends on Class A Shares or (ii) exchange from another
Pioneer mutual fund will be deemed to be the date on which the original Class A
shares were purchased.

         Article II.  Class B Shares

         Class B Shares are sold at net asset value per share without the
imposition of an initial sales charge. However, Class B Shares redeemed within a
specified number of years of purchase will be subject to a CDSC as set forth in
the Fund's prospectus. Class B Shares are sold subject to the minimum purchase
requirements set forth in the Fund's prospectus. Class B Shares shall be
entitled to the shareholder services set forth from time to time in the Fund's
prospectus with respect to Class B Shares. Class B Shares are subject to fees
calculated as a stated percentage of the net assets attributable to Class B
Shares under the Class B Rule 12b-1 Distribution Plan as set forth in such
Distribution Plan. The Class B Shareholders of the Fund have exclusive voting
rights, if any, with respect to the Fund's Class B Rule 12b-1 Distribution Plan.
Transfer agency fees are allocated to Class B Shares on a per account basis
except to the extent, if any, such an allocation would cause the Fund to fail to
satisfy any requirement necessary to obtain or rely on a private letter ruling
from the IRS relating to the issuance of multiple classes of shares. Class B
Shares shall bear the costs and expenses associated with conducting a
shareholder meeting for matters relating to Class B Shares.

         Class B Shares will automatically convert to Class A Shares of the Fund
at the end of a specified number of years after the initial purchase date of
Class B Shares, except as provided in the Fund's prospectus. Such conversion
will occur at the relative net asset value per share of each class without the
imposition of any sales charge, fee or other charge. The conversion of Class B
Shares to Class A Shares may be suspended if it is determined that the
conversion constitutes or is likely to constitute a taxable event under federal
income tax law.

         The initial purchase date for Class B Shares acquired through (i)
reinvestment of dividends on Class B Shares or (ii) exchange from another
Pioneer mutual fund will be deemed to be the date on which the original Class B
shares were purchased.

         Article III.  Class C Shares

         Class C Shares are sold at net asset value and subject to the initial
sales charge schedule as set forth in the Fund's prospectus. Class C Shares
redeemed within one year of purchase will be subject to a CDSC as set forth in
the Fund's prospectus. Class C Shares are sold subject to the minimum purchase
requirements set forth in the Fund's prospectus. Class C Shares shall be
entitled to the shareholder services set forth from time to time in the Fund's
prospectus with respect to Class C Shares. Class C Shares are subject to fees
calculated as a stated percentage of the net assets attributable to Class C
Shares under the Class C Rule 12b-1 Distribution Plan as set forth in such
Distribution Plan. The Class C Shareholders of the Fund have exclusive voting
rights, if any, with respect to the Fund's Class C Rule 12b-1 Distribution Plan.
Transfer agency fees are allocated to Class C Shares on a per account basis
except to the extent, if any, such an allocation would cause the Fund to fail to
satisfy any requirement necessary to obtain or rely on a private letter ruling
from the IRS relating to the issuance of multiple classes of shares. Class C
Shares shall bear the costs and expenses associated with conducting a
shareholder meeting for matters relating to Class C Shares.

         The initial purchase date for Class C Shares acquired through (i)
reinvestment of dividends on Class C Shares or (ii) exchange from another
Pioneer mutual fund will be deemed to be the date on which the original Class C
shares were purchased.

         Article IV.  Approval by Board of Trustees

         This Plan shall not take effect until it has been approved by the vote
of a majority (or whatever greater percentage may, from time to time, be
required under Rule 18f-3 under the Act) of (a) all of the Trustees of the Fund
and (b) those of the Trustees who are not "interested persons" (as such term may
be from time to time defined under the Act) of the Fund.

         Article V.  Amendments

         No material amendment to the Plan shall be effective unless it is
approved by the Board of Trustees in the same manner as is provided for approval
of this Plan in Article IV.