PIONEER DYNAMIC CREDIT FUND

                     (a series of Pioneer Series Trust X)

                  Multiple Class Plan Pursuant to Rule 18f-3
Class A Shares, Class C Shares, Class K Shares and Class Y Shares
                                 May 20, 2018

   Each class of shares of Pioneer Dynamic Credit 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 Multiple
Class 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 per share 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 Fund's 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 C Shares

   Class C Shares are sold at net asset value per share without the imposition
of an initial sales charge. Class C Shares redeemed within one (1) 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.

   Class C 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 C 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 C
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 laws.

   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 III. Class K Shares

   Class K Shares are sold at net asset value per share without the imposition
of an initial sales charge. Class K Shares are not subject to a CDSC upon
redemption regardless of the length of the period of time such shares are held.
Class K Shares are sold subject to the minimum purchase requirements set forth
in the Fund's prospectus. Class K Shares shall be entitled to the shareholder
services set forth from time to time in the Fund's prospectus with respect to
Class K Shares.

   Class K Shares are not subject to fees payable under a distribution or other
plan adopted pursuant to Rule 12b-1 under the Investment Company Act of 1940,
as amended (the "Act"). The Class K Shareholders of the Fund have exclusive
voting rights, if any, with respect to the Fund's possible future adoption of a
Class K Rule 12b-1 Distribution Plan. Transfer agency fees are allocated to
Class K 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 K Shares shall bear the costs and expenses
associated with conducting a shareholder meeting for matters relating to
Class K Shares.

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



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   Article IV. Class Y Shares

   Class Y Shares are sold at net asset value per share without the imposition
of an initial sales charge. Class Y Shares are not subject to a CDSC upon
redemption regardless of the length of the period of time such shares are held.
Class Y Shares are sold subject to the minimum purchase requirements set forth
in the Fund's prospectus. Class Y Shares shall be entitled to the shareholder
services set forth from time to time in the Fund's prospectus with respect to
Class Y Shares.

   Class Y Shares are not subject to fees payable under a distribution or other
plan adopted pursuant to Rule 12b-1 under the Act. The Class Y Shareholders of
the Fund have exclusive voting rights, if any, with respect to the Fund's
possible future adoption of a Class Y Rule 12b-1 Distribution Plan. Transfer
agency fees are allocated to Class Y 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 Y Shares
shall bear the costs and expenses associated with conducting a shareholder
meeting for matters relating to Class Y Shares.

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

   Article V. Approval by Board of Trustees

   This Multiple Class 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 VI. Amendments

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

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