CLASS R SHARES DISTRIBUTION PLAN

                     PIONEER CALIFORNIA TAX FREE INCOME FUND

     CLASS R SHARES DISTRIBUTION PLAN, dated as of [  ], 2004 of PIONEER
CALIFORNIA TAX FREE INCOME FUND (the "Fund"), a series of Pioneer Series Trust
II, a Delaware statutory trust (the "Trust").

                                   WITNESSETH

     WHEREAS, the Trust is engaged in business as an open-end, management
investment company and is registered under the Investment Company Act of 1940,
as amended (collectively with the rules and regulations promulgated thereunder,
the "1940 Act");

     WHEREAS, the Trust intends to distribute shares of beneficial interest (the
"Class R Shares") of the Trust in accordance with Rule 12b-1 promulgated by the
Securities and Exchange Commission under the 1940 Act ("Rule 12b-1"), and
desires to adopt this Class R Shares distribution plan (the "Class R Plan") as a
plan of distribution pursuant to Rule 12b-1;

     WHEREAS, the Trust desires that Pioneer Funds Distributor, Inc., a
Massachusetts corporation ("PFD") or such other persons as may be appointed
principal underwriter from time to time, provide certain distribution services
for the Trust's Class R Shares in connection with the Class R Plan (PFD and any
successor principal underwriter of the Trust's shares being referred to as an
"Underwriter");

     WHEREAS, the Trust has entered into an underwriting agreement (in a form
approved by the Trust's Board of Trustees in a manner specified in Rule 12b-1)
with the Underwriter, whereby the Underwriter provides facilities and personnel
and renders services to the Trust in connection with the offering and
distribution of Class R Shares (the "Underwriting Agreement");

     WHEREAS, the Trust also recognizes and agrees that (a) the Underwriter may
retain the services of firms or individuals to act as dealers or wholesalers
(collectively, the "Dealers") of the Class R Shares in connection with the
offering of Class R Shares, (b) the Underwriter may compensate any Dealer that
sells Class R Shares in the manner and at the rate or rates to be set forth in
an agreement between the Underwriter and such Dealer and (c) the Underwriter may
make such payments to the Dealers for distribution services out of the fee paid
to the Underwriter hereunder, any deferred sales charges imposed by the
Underwriter in connection with the repurchase of Class R Shares, its profits or
any other source available to it;

     WHEREAS, the Trust recognizes and agrees that the Underwriter may impose
certain deferred sales charges in connection with the repurchase of Class R
Shares by the Trust, and the Underwriter may retain (or receive from the Trust,
as the case may be) all such deferred sales charges; and

     WHEREAS, the Board of Trustees of the Trust, in considering whether the
Trust should adopt and implement this Class R Plan, has evaluated such
information as it deemed necessary to



make an informed determination whether this Class R Plan should be adopted and
implemented and has considered such pertinent factors as it deemed necessary to
form the basis for a decision to use assets of the Trust for such purposes, and
has determined that there is a reasonable likelihood that the adoption and
implementation of this Class R Plan will benefit the Trust and its Class R
shareholders;

     NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this Class
R Plan for the Trust as a plan of distribution of Class R Shares in accordance
with Rule 12b-1, on the following terms and conditions:

     1.   (a)  The Fund is authorized to compensate the Underwriter for (1)
     distribution services and (2) personal and account maintenance services
     performed and expenses incurred by the Underwriter in connection with the
     Fund's Class R Shares. Such compensation shall be calculated and accrued
     daily and paid monthly or at such other intervals as the Board of Trustees
     may determine.

          (b)  The amount of compensation payable to the Underwriter during any
     one (1) year for distribution services with respect to Class R Shares shall
     be 0.25% of the Fund's average daily net assets attributable to Class R
     Shares for such year (the "Distribution Fee").

          (c)  Distribution services and expenses for which an Underwriter may
     be compensated pursuant to this Class R Plan include, without limitation:
     compensation to and expenses (including allocable overhead, travel and
     telephone expenses) of (i) Dealers, brokers and other dealers who are
     members of the National Association of Securities Dealers, Inc. (the
     "NASD") or their officers, sales representatives and employees, (ii) the
     Underwriter and any of its affiliates and any of their respective officers,
     sales representatives and employees, (iii) banks and their officers, sales
     representatives and employees, who engage in or support distribution of the
     Fund's Class R Shares; printing of reports and prospectuses for other than
     existing shareholders; and preparation, printing and distribution of sales
     literature and advertising materials.

          (d)  The Underwriter shall be deemed to have performed all services
     required to be performed in order to be entitled to receive the
     Distribution Fee, if any, payable with respect to Class R Shares sold
     through such Underwriter upon the settlement date of the sale of such Class
     R Shares or in the case of Class R Shares issued through one or a series of
     exchanges of shares of another investment company for which the Underwriter
     acts as principal underwriter or issued as a dividend or distribution upon
     Class R Shares, on the settlement date of the first sale on a commission
     basis of a Class R Share from which such Class R share was derived.

          (e)  The amount of compensation paid during any one (1) year for
     personal and account maintenance services and expenses shall be 0.25% of
     the Fund's average daily net assets attributable to Class R Shares for such
     year. As partial consideration for personal services and/or account
     maintenance services provided by the Underwriter to the Class R Shares, the
     Underwriter shall be entitled to be paid any fees payable under this clause
     (e) with respect to Class R Shares for which no dealer of record exists,
     where less

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     than all consideration has been paid to a dealer of record or where
     qualification standards have not been met.

          (f)  Personal and account maintenance services for which the
     Underwriter or any of its affiliates, banks or Dealers may be compensated
     pursuant to this Class R Plan include, without limitation: payments made to
     or on account of the Underwriter or any of its affiliates, banks, other
     brokers and dealers who are members of the NASD, or their officers, sales
     representatives and employees, who respond to inquiries of, and furnish
     assistance to, shareholders regarding their ownership of Class R Shares or
     their accounts or who provide similar services not otherwise provided by or
     on behalf of the Fund.

          (g)  The Underwriter may impose certain deferred sales charges in
     connection with the repurchase of Class R Shares by the Fund and the
     Underwriter may retain (or receive from the Fund as the case may be) all
     such deferred sales charges.

          (h)  Appropriate adjustments to payments made pursuant to clauses (b)
     and (e) of this paragraph 1 shall be made whenever necessary to ensure that
     no payment is made by the Fund in excess of the applicable maximum cap
     imposed on asset based, front-end and deferred sales charges by Section
     2830(d) of the Conduct Rules of the NASD.

     2.   The Trust understands that agreements between the Underwriter and
Dealers may provide for payment of fees to Dealers in connection with the sale
of Class R Shares and the provision of services to shareholders of the Fund.
Nothing in this Class R Plan shall be construed as requiring the Fund or the
Trust to make any payment to any Dealer or to have any obligations to any Dealer
in connection with services as a dealer of the Class R Shares. The Underwriter
shall agree and undertake that any agreement entered into between the
Underwriter and any Dealer shall provide that such Dealer shall look solely to
the Underwriter for compensation for its services thereunder and that in no
event shall such Dealer seek any payment from the Fund or the Trust.

     3.   Nothing herein contained shall be deemed to require the Trust to take
any action contrary to its Agreement and Declaration of Trust, as it may be
amended or restated from time to time, or By-Laws or any applicable statutory or
regulatory requirement to which it is subject or by which it is bound, or to
relieve or deprive the Trust's Board of Trustees of the responsibility for and
control of the conduct of the affairs of the Trust; it being understood that
actions taken pursuant to Section 1(b) shall not be considered such an action
described above.

     4.   This Class R Plan shall become effective upon approval by a vote of
the Board of Trustees, including a majority of the Trustees who are not
"interested persons" of the Trust and who have no direct or indirect financial
interest in the operation of the Class R Plan or in any agreements related to
the Class R Plan (the "Qualified Trustees"), such votes to be cast in person at
a meeting called for the purpose of voting on this Class R Plan.

     5.   This Class R Plan will remain in effect indefinitely, provided that
such continuance is "specifically approved at least annually" by a vote of both
a majority of the Trustees of the Trust and a majority of the Qualified
Trustees. If such annual approval is not

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obtained,  this  Class R Plan  shall  expire on the  annual  anniversary  of the
adoption of this Class R Plan following the last such approval.

     6.   This Class R Plan may be amended at any time by the Board of Trustees;
PROVIDED that this Class R Plan may not be amended to increase materially the
limitations on the annual percentage of average net assets which may be expended
hereunder without the approval of holders of a "majority of the outstanding
voting securities" of Class R of the Fund and may not be materially amended in
any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Class R Plan may be terminated at any time by a vote of a
majority of the Qualified Trustees or by a vote of the holders of a "majority of
the outstanding voting securities" of Class R of the Fund.

     7.   The Trust and the Underwriter shall provide to the Trust's Board of
Trustees, and the Board of Trustees shall review, at least quarterly, a written
report of the amounts expended under this Class R Plan and the purposes for
which such expenditures were made.

     8.   While this Class R Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

     9.   For the purposes of this Class R Plan, the terms "interested persons,"
"majority of the outstanding voting securities" and "specifically approved at
least annually" are used as defined in the 1940 Act.

     10.  The Trust shall preserve copies of this Class R Plan, and each
agreement related hereto and each report referred to in Paragraph 7 hereof
(collectively, the "Records"), for a period of not less than six (6) years from
the end of the fiscal year in which such Records were made and, for a period of
two (2) years, each of such Records shall be kept in an easily accessible place.

     11.  This Class R Plan shall be construed in accordance with the laws of
The Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

     12.  If any provision of this Class R Plan shall be held or made invalid by
a court decision, statute, rule or otherwise, the remainder of the Class R Plan
shall not be affected thereby.

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