PIONEER AMERICA INCOME TRUST
485BPOS, 1995-04-27
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                                                          File No. 33-20795
                                                                   811-5516

              As filed with the Securities and Exchange Commission
   
                               on April 27, 1995
    

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933    / X /

     Pre-Effective Amendment No. ___                       /   /
   
     Post-Effective Amendment No. 9                        / X /
    
                                     and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT
OF 1940                                                    / X /
   
     Amendment No. 10                                      / X /
    
                        (Check appropriate box or boxes)

                          PIONEER AMERICA INCOME TRUST
                    (formerly Pioneer U.S. Government Trust)
               (Exact name of registrant as specified in charter)


                  60 State Street, Boston, Massachusetts 02109
                (Address of principal executive office) Zip Code


       Registrant's Telephone Number, including Area Code: (617) 742-7825


       Joseph P. Barri, Hale and Dorr, 60 State Street, Boston, MA 02109
                    (Name and address of agent for service)


It is proposed that this filing will become effective:
   
    /X/     immediately upon filing pursuant to Rule 485(b)
    / /     on (date) pursuant to Rule 485(b)
    / /     60 days after filing pursuant to Rule 485(a)(1)
    / /     0n (date) pursuant to Rule 485(a)(1)
    / /     75 days after filing pursuant to Rule 485(a)(2)
    / /     0n (date) pursuant to Rule 485(a)(2)
    
       

   
Registrant  has  registered  an  indefinite   amount  of  securities  under  the
Securities Act of 1933 pursuant to Section 24(f) of the  Investment  Company Act
of 1940. The Registrant  filed the Notice  required by Rule 24f-2 for its fiscal
year ended December 31, 1994 on or about February 24, 1995.
    
<PAGE>


                          PIONEER AMERICA INCOME TRUST

       Cross-Reference Sheet Showing Location in Prospectus and Statement
         of Additional Information of Information Required by Items of
                             the Registration Form


                                                       Location in
                                                       Prospectus or
                                                       Statement of
Form N-1A Item Number and Caption                      Additional Information


1.   Cover Page........................................Prospectus - Cover Page

2.   Synopsis..........................................Prospectus - Expense
                                                       Information

3.   Condensed Financial Information...................Prospectus - Financial
                                                       Highlights

4.   General Description of Registrant.................Prospectus - Investment
                                                       Objective and Policies;
                                                       Management of the Trust;
                                                       Trust Share Alternatives;
                                                       Share Price; How to Sell
                                                       Trust Shares; How to
                                                       Exchange Trust Shares; 
                                                       The Trust


5.   Management of the Fund............................Prospectus - Management
                                                       of the Trust

6.   Capital Stock and Other Securities................Prospectus - Investment
                                                       Objective and Policies; 
                                                       Trust Share Alternatives;
                                                       Share Price; How to Sell 
                                                       Trust Shares; How to 
                                                       Exchange Trust Shares; 
                                                       The Trust
<PAGE>
                                                       Location in
                                                       Prospectus or
                                                       Statement of
Form N-1A Item Number and Caption                      Additional Information


7.   Purchase of Securities Being Offered..............Prospectus - Trust Share
                                                       Alternatives; Share Price
                                                       ; How to Sell Trust
                                                       Shares; How to Exchange
                                                       Trust Shares; The Trust;
                                                       Shareholder Services; 
                                                       Distribution Plans

8.   Redemption or Repurchase..........................Prospectus - Trust Share
                                                       Alternatives; Share Price
                                                       ; How to Sell Trust
                                                       Shares; How to Exchange
                                                       Trust Shares; The Trust;
                                                       Shareholder Services

9.   Pending Legal Proceedings.........................Not Applicable


10.  Cover Page........................................Statement of Additional 
                                                       Information - Cover Page

11.  Table of Contents.................................Statement of Additional 
                                                       Information - Cover Page

12.  General Information and History...................Statement of Additional 
                                                       Information - Cover Page;
                                                       Description of Shares

13.  Investment Objectives and Policy..................Statement of Additional 
                                                       Information - Investment
                                                       Policies and Restrictions

14.  Management of the Fund............................Statement of Additional 
                                                       Information - Management
                                                       of the Trust; Investment
                                                       Adviser
<PAGE>

15.  Control Persons and Principle Holders
       of Securities...................................Statement of Additional
                                                       Information - Management
                                                       of the Trust

16.  Investment Advisory and Other
       Services........................................Statement of Additional 
                                                       Information - Management
                                                       of the Trust; Investment
                                                       Adviser; Principal
                                                       Underwriter; Distribution
                                                       Plans; Shareholder
                                                       Servicing/Transfer Agent;
                                                       Custodian; Independent
                                                       Public Accountant

17.  Brokerage Allocation and Other
       Practices.......................................Statement of Additional 
                                                       Information - Portfolio
                                                       Transactions

18.  Capital Stock and Other Securities................Statement of Additional 
                                                       Information - Description
                                                       of Shares; Certain
                                                       Liabilities

19.  Purchase Redemption and Pricing of
       Securities Being Offered........................Statement of Additional 
                                                       Information - Letter of 
                                                       Intention; Systematic 
                                                       Withdrawal Plan; 
                                                       Determination of Net 
                                                       Asset Value

20.  Tax Status........................................Statement of Additional 
                                                       Information - Tax Status
<PAGE>

                                                       Location in
                                                       Prospectus or
                                                       Statement of
Form N-1A Item Number and Caption                      Additional Information

21.  Underwriters......................................Statement of Additional 
                                                       Information - Principal
                                                       Underwriter; Distribution
                                                       Plans

22.  Calculation of Performance Data...................Statement of Additional 
                                                       Information - Investment 
                                                       Results

23.  Financial Statements..............................Statement of Additional 
                                                       Information - Financial 
                                                       Statements








<PAGE>

Pioneer America 
Income Trust 
Class A and Class B Shares 
Prospectus 
April 28, 1995 

The investment objective of Pioneer America Income Trust (the "Trust") is to 
provide as high a level of current income as is consistent with preservation of 
capital and prudent investment risk. The Trust seeks to achieve this objective 
by investing its assets exclusively in securities backed by the full faith and 
credit of the United States ("U.S.") and in "when issued" commitments and 
repurchase agreements with respect to such securities. 

Trust returns and share prices fluctuate and the value of your account upon 
redemption may be more or less than your purchase price. Shares in the Trust 
are not deposits or obligations of, or guaranteed or endorsed by, any bank or 
other insured depository institution, and the shares are not federally insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any 
other government agency. 

This Prospectus (Part A of the Registration Statement) provides information 
about the Trust that you should know before investing in the Trust. Please read 
and keep it for your future reference. More information about the Trust is 
included in Part B, the Statement of Additional Information, also dated April 
28, 1995, which is incorporated into this Prospectus by reference. A copy of 
the Statement of Additional Information may be obtained free of charge by 
calling Shareholder Services at 1-800-225- 6292 or by written request to the 
Trust at 60 State Street, Boston, Massachusetts 02109. Other information about 
the Trust has been filed with the Securities and Exchange Commission (the 
"SEC") and is available upon request and without charge. 

<TABLE>
<CAPTION>
             TABLE OF CONTENTS                                        PAGE 
<S>          <C>                                                       <C>
I.           EXPENSE INFORMATION                                        2 
II.          FINANCIAL HIGHLIGHTS                                       3 
III.         INVESTMENT OBJECTIVE AND POLICIES                          4 
              U.S. Government Securities                                4 
              GNMA Certificates                                         4 
              "When-Issued" GNMA Certificates                           5 
IV.          MANAGEMENT OF THE TRUST                                    5 
V.           TRUST SHARE ALTERNATIVES                                   6 
VI.          SHARE PRICE                                                7 
VII.         HOW TO BUY TRUST SHARES                                    7 
VIII.        HOW TO SELL TRUST SHARES                                   9 
IX.          HOW TO EXCHANGE TRUST SHARES                              10 
X.           DISTRIBUTION PLANS                                        11 
XI.          DIVIDENDS, DISTRIBUTIONS AND TAXATION                     12 
XII.         SHAREHOLDER SERVICES                                      12 
              Account and Confirmation Statements                      12 
              Additional Investments                                   12 
              Automatic Investment Plans                               12 
              Financial Reports and Tax Information                    13 
              Distribution Options                                     13 
              Directed Dividends                                       13 
              Direct Deposit                                           13 
              Voluntary Tax Withholding                                13 
              Telephone Transactions and Related Liabilities           13 
              Retirement Plans                                         13 
              Telecommunications Device for the Deaf (TDD)             13 
              Systematic Withdrawal Plans                              13 
              Reinstatement Privilege (Class A Shares Only)            14 
XIII.        THE TRUST                                                 14 
XIV.         INVESTMENT RESULTS                                        14 
</TABLE>

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND 
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION 
OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS 
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. 

                                        1 
<PAGE> 
I. EXPENSE INFORMATION 

   
This table is designed to help you understand the charges and expenses that 
you, as a shareholder, will bear directly or indirectly when you invest in the 
Trust. The table reflects actual expenses for the fiscal year ended December 
31, 1994. 
<TABLE>
<CAPTION>
Shareholder Transaction Expenses:                         Class A      Class B 
<S>                                                       <C>          <C>
 Maximum Initial Sales Charge on Purchases (as a 
    percentage of offering price)                         4.50%        None 
 Maximum Sales Charge on Reinvestment 
    of Dividends                                          None         None 
 Maximum Deferred Sales Charge (as a   percentage of 
  original purchase price or   redemption price, as 
  applicable)                                             None(1)      4.00% 
 Redemption Fee(2)                                        None         None 
 Exchange Fee                                             None         None 
Annual Operating Expenses 
   (as a percentage of average net assets):(4) 
 Management Fee (after Expense Limitation)(3)             0.38%        0.38% 
 12b-1 Fees                                               0.25%        1.00% 
 Other Expenses (including transfer agent fee, 
    custodian fees and accounting and printing 
    expenses)                                             0.37%        0.40% 
Total Operating Expenses (after Expense 
   Limitation):(3)                                        1.00%        1.78% 
</TABLE>

(1) Purchases of $1,000,000 or more and purchases by participants of certain 
group plans are not subject to an initial sales charge but may be subject to a 
contingent deferred sales charge. 

(2) Separate fees (currently $10 and $20, respectively) apply to domestic and 
international bank wire transfers of redemption proceeds. 

(3) Effective January 1, 1994, Pioneering Management Corporation (the 
"Manager"), agreed not to impose a portion of its management fee and to make 
other arrangements, if necessary, to the extent necessary to limit the 
operating expenses of the Trust as listed below. This agreement is voluntary 
and temporary and may be revised or terminated at any time. 
<TABLE>
<CAPTION>
                                     Class A          Class B 
<S>                                   <C>              <C>
Expense Limitation                    1.00 %            see below 
Expenses Absent Limitation 
   Total Operating Expenses           1.12%            1.90% 
 Management Fee                       0.50%            0.50% 
</TABLE>
    
* The portion of fund-wide expenses attributable to Class B shares will be 
reduced only to the extent such expenses are reduced for the Class A shares of 
the Trust. 

(4) For Class B shares, operating expenses are based on estimated expenses that 
would have been incurred if Class B shares had been outstanding for the entire 
year. 

Example: 

You would pay the following fees and expenses on a $1,000 investment, assuming 
a 5% annual return and redemption at the end of each of the time periods: 
<TABLE>
<CAPTION>
                               1 Year      3 Years      5 Years       10 Years 
<S>                              <C>         <C>          <C>          <C>
Class A Shares                   $55         $75          $ 98         $ 162 
Class B Shares 
 --Assuming complete 
  redemption at end of 
  period                         $58         $86          $116         $189* 
 --Assuming no redemption        $18         $56          $ 96         $189* 
</TABLE>

   
*Class B shares convert to Class A shares eight years after purchase; 
therefore, Class A expenses are used after year eight. 
    

The example above assumes reinvestment of all dividends and distributions and 
that the percentage amounts listed under "Annual Operating Expenses" remain the 
same each year. 

The example is designed for informational purposes only, and should not be 
considered a representation of past or future expenses or return. Actual Trust 
expenses and return vary from year to year and may be higher or lower than 
those shown. 

For further information regarding management fees, 12b-1 fees and other 
expenses of the Trust, including information regarding the basis upon which 
fees and expenses are reduced or reallocated, see "Management of the Trust," 
"Distribution Plans" and "How To Buy Trust Shares" in this Prospectus and 
"Management of the Trust" and "Underwriting Agreement and Distribution Plans" 
in the Statement of Additional Information. The Trust's payment of Rule 12b-1 
fees may result in long-term shareholders indirectly paying more than the 
economic equivalent of the maximum initial sales charge permitted under the 
Rules of Fair Practice of the National Association of Securities Dealers, Inc. 

The maximum initial sales charge is reduced on purchases of specified amounts 
and the value of shares owned in other Pioneer mutual funds is taken into 
account in determining the applicable initial sales charge. See "How to Buy 
Trust Shares." No sales charge is applied to exchanges of shares of the Trust 
for shares of other publicly available mutual funds in the Pioneer complex. See 
"How to Exchange Trust Shares." 

                                        2 
<PAGE> 
II. FINANCIAL HIGHLIGHTS 
   
The following information has been derived from financial statements of the 
Trust which have been audited by Arthur Andersen LLP, independent public 
accountants. Arthur Andersen LLP's report on the Trust's financial statements 
as of December 31, 1994 appears in the Trust's Annual Report and is 
incorporated by reference into the Statement of Additional Information. The 
information listed below should be read in conjunction with the financial 
statements contained in the Trust's Annual Report. The Annual Report includes 
more information about the Trust's performance and is available free of charge 
by calling Shareholder Services at 1-800-225-6292. 
Pioneer America Income Trust 
For Each Class A Share Outstanding throughout Each Period: 
<TABLE>
<CAPTION>
                                                                  For the Year Ended December 31, 
                                                                                                                          May 31 
                                                                                                                            to 
                                                                                                                         December 
                                                                                                                            31, 
                                                 1994+        1993        1992        1991        1990        1989         1988 
<S>                                             <C>         <C>         <C>         <C>         <C>          <C>          <C>
Net asset value, beginning of period            $  10.48    $  10.27    $ 10.35     $ 10.03     $ 10.04      $  9.86      $10.00 
Income from investment operations: 
 Net investment income                          $   0.66    $   0.68    $  0.73     $  0.84     $  0.87      $  0.90      $ 0.51 
 Net realized and unrealized gain (loss) on 
    investments                                    (1.07)       0.24      (0.07)       0.33       (0.02)        0.18       (0.14) 
   
   Total income from investment operations      $  (0.41)   $   0.92    $  0.66     $  1.17     $  0.85      $  1.08      $ 0.37 
Distribution to shareholders from: 
 Net investment income                             (0.66)      (0.67)     (0.73)      (0.85)      (0.86)       (0.90)      (0.51) 
   
 Net realized capital gains                         0.00       (0.04)     (0.01)       --          --           --          -- 
Net increase (decrease) in net asset value      $  (1.07)   $   0.21    $ (0.08)    $  0.32     $ (0.01)     $  0.18      $(0.14) 
   
Net asset value, end of period                  $   9.41    $  10.48    $ 10.27     $ 10.35     $ 10.03      $ 10.04      $ 9.86 
Total return*                                      (3.97)%      9.07%      6.67%      12.14%       8.99%       11.49%       3.76% 
   
Ratio of net operating expenses to average 
  net  assets                                       1.00%       1.00%      1.03%       0.75%       0.75%        0.75%        0.67%**
Ratio of net investment income to average 
  net  assets                                       6.84%       6.37%      7.01%       8.07%       8.75%        9.10%        8.86%**
Portfolio turnover rate                            60.50%      41.50%     54.50%      36.54%      69.12%       66.06%       61.20%**
Net assets, end of period (in thousands)        $161,858    $105,892    $85,425     $43,711     $17,160      $10,533       $4,634 
Ratios assuming no reduction of fees or 
  expenses 
   by the Manager: 
  Net operating expenses                            1.12%       1.13%      1.25%       1.75%       1.81%        2.36%        3.01%**
  Net investment income                             6.72%       6.24%      6.79%       7.07%       7.69%        7.49%        6.52%**
</TABLE>
    
For Each Class B Share Outstanding throughout Each Period: 
<TABLE>
<CAPTION>
                                                                         April 29, 1994 
                                                                      to December 31, 1994+ 
<S>                                                                   <C>
Net asset value, beginning of period                                         $ 9.85 
Income from investment operations: 
 Net investment income                                                       $ 0.40 
 Net realized and unrealized loss on investments                              (0.45) 
   Total loss from investment operations                                     $(0.05) 
Distribution to shareholders: 
 From net investment income                                                   (0.40) 
Net decrease in net asset value                                              $(0.45) 
Net asset value, end of period                                               $ 9.40 
Total return*                                                                 (0.57)% 
Ratio of net operating expenses to average net assets                          1.78%** 
Ratio of net investment income to average net assets                           6.35%** 
Portfolio turnover rate                                                       60.50%** 
Net assets, end of period (in thousands)                                     $2,170 
Ratios assuming no reduction of fees or expenses by the Manager: 
  Net operating expenses                                                       1.90%** 
  Net investment income                                                        6.23%** 
</TABLE>
+ Based upon average shares outstanding and average net assets for the period 
presented. 
* Assumes initial investment at net asset value at the beginning of each 
period, reinvestment of all dividends and distributions, the complete 
redemption of the investment at net asset value at the end of each period, and 
no sales charges. Total return would be reduced if sales charges were taken 
into account. 
** Annualized. 
*** Class B shares were first offered April 29, 1994. 

                                        3 
<PAGE> 
III. INVESTMENT OBJECTIVE AND POLICIES 
   
The investment objective of the Trust is to provide as high a level of current 
income as is consistent with preservation of capital and prudent investment 
risk. The Trust seeks to achieve this objective by investing its assets 
exclusively in securities backed by the full faith and credit of the United 
States and in "when-issued" commitments and repurchase agreements with respect 
to such securities. The Trust may only invest in securities and engage in 
transactions in securities that are legal under applicable Federal law, as of 
November 17, 1994, for federal credit unions. 
    
   
U.S. Government Securities include (1) U.S. Treasury obligations, which differ 
only in their interest rates, maturities and times of issuance: U.S. Treasury 
bills (maturities of one year or less), U.S. Treasury notes (maturities of one 
to ten years) and U.S. Treasury bonds (generally maturities of greater than ten 
years) and (2) obligations of varying maturities issued or guaranteed by 
certain agencies and instrumentalities of the U.S. Government, such as mortgage 
participation certificates ("GNMA Certificates") guaranteed by the Government 
National Mortgage Association ("GNMA") and Federal Housing Administration 
("FHA") debentures, for which the U.S. Treasury unconditionally guarantees 
payment of principal and interest. Although the payment when due of interest 
and principal on U.S. Government Securities is backed by the full faith and 
credit of the United States, this guarantee does not extend to the market value 
of these securities and, accordingly, the net asset value of the Trust's shares 
will fluctuate. 
    
The Trust's portfolio will be managed by purchasing and selling securities, as 
well as holding selected securities to maturity. The Trust's investment manager 
employs "cycle analysis" in the management of the Trust's portfolio. Cycle 
analysis is the process of analyzing the business and credit cycles of the 
economy to identify and monitor trends in interest rates and to identify debt 
securities with characteristics most likely to meet the Trust's objectives at 
given stages in all cycles. Relying on analysis of economic indicators, as well 
as price, yield and maturity data of individual securities, this process 
requires ongoing adjustments to the portfolio based on the relative values or 
maturities of individual securities. 

Any such change in the portfolio may result in increases or decreases in the 
Trust's current income available for distribution to shareholders and in its 
holding of debt securities which sell at moderate to substantial premiums or 
discounts from face value. If the Trust's expectations of changes in interest 
rates or its evaluation of the normal yield relationships between two 
securities prove to be incorrect, the Trust's income, net asset value and 
potential gain may be reduced or its potential loss may be increased. 

The Trust is free to take advantage of the entire range of maturities offered 
by U.S. Government Securities, and the average maturity of the Trust's 
portfolio may vary significantly. Under normal circumstances, however, the 
dollar weighted average portfolio maturity of the Trust is not expected to 
exceed twenty years. Capital gains will not be a major consideration in the 
selection of investments. The Trust will not normally engage in short-term 
trading but it may do so when it believes a particular transaction will 
contribute to the achievement of its investment objective. 

The Trust may invest all or any portion of its assets in GNMA Certificates but 
it is not obligated to do so; the portion of its assets so invested will vary 
with management's view of the relative yields and values of GNMA Certificates 
compared to U.S. Treasury obligations. 

GNMA Certificates are mortgage-backed securities which evidence part ownership 
of a pool of mortgage loans. The mortgages loans are made by lenders such as 
mortgage bankers, commercial banks and savings and loan associations, and are 
insured by the Federal Housing Administration or the Farmers' Home 
Administration ("FHMA"), or guaranteed by the Veterans Administration ("VA"). 
The mortgages are grouped in pools containing mortgages which are of similar 
types and maturities and bear similar interest rates. Upon approval by GNMA of 
a pool, GNMA guarantees the timely payment of principal and interest on 
securities backed by the pool. The GNMA guarantee is backed by the full faith 
and credit of the United States Government. GNMA is also empowered to borrow 
without limitation from the U.S. Treasury if necessary to make any payments 
required under its guarantee. 

The GNMA Certificates which the Trust purchases are the "modified pass-through" 
type. Modified pass-through certificates entitle the holder to receive all 
principal and interest owned on the mortgages in the pool, net of fees paid to 
the issuer and GNMA, regardless of whether or not the mortgagor actually makes 
the payment. 

The average life of a GNMA Certificate is likely to be substantially less than 
the original maturity of the underlying mortgage pools because of principal 
prepayments and foreclosures. Foreclosures create no risk to principal invested 
because of the GNMA guarantee. As prepayment rates of individual mortgage pools 
will vary widely, it is not possible to predict accurately the average life of 
a particular issue of GNMA Certificates. However, it is customary to treat GNMA 
Certificates as 30-year mortgage-backed securities which prepay fully in the 
twelfth year. 

There are several factors that may cause the yield earned by the Trust to be 
substantially different than the coupon rate of interest on the GNMA 
Certificates and other securities held in the Trust's portfolio. First, as with 
any fund consisting of fixed-income securities, repayments and prepayments of 
principal require reinvestment which may be at a lower or higher interest rate. 
This reinvestment risk is increased in the case of GNMA Certificates because 
principal is repaid monthly rather than in a lump sum at maturity. Second, 
prepayments of mortgage-backed GNMA Certificates will tend to increase when 
general interest rates decline, requiring reinvestment at the lower market 
rate. Higher interest rate mortgages will be more prone to prepayment. Third, 
the Trust may purchase GNMA Certificates at a premium or discount, rather than 
at par, causing actual yield to be lower or higher than the interest rate on 
the GNMA Certificates. After issuance, GNMA Certificates may also trade in the 
market at a premium or discount. Upon prepayment, the Trust may realize a loss 
in the amount of any unamortized premiums paid upon purchase of GNMA 
Certificates since prepayment may be at par. 

                                        4 
<PAGE> 
The values of the U.S. Government Securities, including GNMA Certificates, in 
which the Trust will invest will fluctuate with changes in interest rates. 
Changes in the value of such securities will not affect interest income from 
those obligations but will be reflected in the Trust's net asset value. Thus, a 
decrease in interest rates will generally result in an increase in the value of 
the Trust's shares and conversely during periods of rising interest rates the 
value of the Trust's shares will generally decline. The magnitude of these 
fluctuations will generally be greater when the Trust's average maturity is 
longer. 

GNMA Certificates may offer yields higher than those available from other types 
of U.S. Government Securities, but because of their prepayment aspect may be 
less effective than other types of securities as a means of "locking in" 
attractive long-term interest rates. This is caused by the need to reinvest 
prepayments of principal generally and the possibility of significant 
unscheduled prepayments resulting from declines in mortgage interest rates. 
These prepayments would have to be reinvested at the lower rates. As a result, 
the Trust's GNMA Certificates may have less potential for capital appreciation 
during periods of declining interest rates than other U.S. Government 
Securities of comparable maturities, although such obligations may have a 
comparable risk of decline in market value during periods of rising interest 
rates. 

GNMA Certificates are highly liquid instruments because of the size of the 
market and the active participation in the secondary market by securities 
dealers and many types of investors. Prices of GNMA Certificates are readily 
available from securities dealers and depend on, among other things, the level 
of market rates, the GNMA Certificate's coupon rate and prepayment experience 
of the pool of mortgages backing each GNMA Certificate. 

For further information on GNMA Certificates, see "Investment Policies and 
Restrictions" in the Statement of Additional Information. 

"When-Issued" GNMA Certificates. The Trust may purchase and sell GNMA 
Certificates on a when-issued or a delayed delivery basis. When-issued or 
delayed delivery transactions arise when securities are purchased or sold by 
the Trust with payment and delivery taking place in the future in order to 
secure what is considered to be an advantageous price and yield which is fixed 
at the time of entering into the transaction. However, the yield on a 
comparable GNMA Certificate when the transaction is consummated may vary from 
the yield on the GNMA Certificate at the time that the when-issued or delayed 
delivery transaction was made. Also, the market value of the when-issued or 
delayed delivery GNMA Certificate may increase or decrease as a result of 
changes in general interest rates. When-issued and delayed delivery 
transactions involve risk of loss if the value of the GNMA Certificate declines 
before the settlement date. This risk is in addition to the risk of decline in 
the value of the Trust's other assets. When the Trust engages in when-issued 
and delayed delivery transactions, the Trust relies on the seller or buyer, as 
the case may be, to consummate the transaction. Failure of the seller or buyer 
to do so may result in the Trust missing the opportunity of obtaining a price 
or yield considered to be advantageous. However, no payment or delivery is made 
by the Trust until it receives payment or delivery from the other party to the 
transaction. To the extent the Trust engages in when-issued and delayed 
delivery transactions, it will do so for the purpose of acquiring or disposing 
of GNMA Certificates for the Trust's portfolio consistent with the Trust's 
investment objective and policies and not for the purpose of investment 
leverage. 

The value of such purchase commitments at any time will not exceed the value of 
the Trust's assets invested in U.S. Treasury Bills and other securities having 
remaining maturities of less than six months. The Trust's investments in 
when-issued or delayed delivery commitments and in repurchase agreements 
(limited to 7 days) may represent up to 25% of its assets. 

The Trust's investment objective and its policy of investing exclusively in 
U.S. Government Securities and when-issued commitments and repurchase 
agreements with respect to such securities are fundamental policies which may 
not be changed without shareholder approval. Except for these policies and 
certain investment restrictions designated in the Statement of Additional 
Information as fundamental, the investment policies described in this 
Prospectus and in the Statement of Additional Information are not fundamental 
policies. The Trustees may change any non-fundamental investment policies 
without shareholder approval. 

IV. MANAGEMENT OF THE TRUST 

The Trust's Board of Trustees has overall responsibility for management and 
supervision of the Trust. There are currently eight Trustees, six of whom are 
not "interested persons" of the Trust as defined in the Investment Company Act 
of 1940, as amended (the "1940 Act"). The Board meets at least quarterly. By 
virtue of the functions performed by Pioneering Management Corporation as 
investment adviser, the Trust requires no employees other than its executive 
officers, all of whom receive their compensation from the Manager or other 
sources. The Statement of Additional Information contains the names and general 
background of each Trustee and executive officer of the Trust. 

The Trust is managed under a contract with the Manager which serves as 
investment adviser to the Trust and is responsible for the overall management 
of the Trust's business affairs, subject only to the authority of the Board of 
Trustees. The Manager is a wholly-owned subsidiary of The Pioneer Group, Inc. 
("PGI"), a Delaware corporation. Pioneer Funds Distributor, Inc. ("PFD"), a 
wholly-owned subsidiary of PMC, is the principal underwriter of shares of the 
Trust. John F. Cogan, Jr., Chairman and President of the Trust, Chairman and a 
director of the Manager, Chairman of PFD, and President and a Director of PGI, 
owned approximately 15% of the outstanding capital stock of PGI as of the date 
of this Prospectus. 

Each domestic fixed income portfolio managed by the Manager, including the 
Trust, is overseen by the Domestic Fixed 

                                        5 
<PAGE> 
   
Income Portfolio Management Committee, which consists of the Manager's most 
senior domestic fixed income professionals. The committee is chaired by David 
D. Tripple, the Manager's President and Chief Investment Officer and Executive 
Vice President of each of the Pioneer funds. Mr. Tripple joined the Manager in 
1974 and has had general responsibility for the Manager's investment operations 
and specific portfolio assignments for over five years. Fixed income 
investments made by the Manager, including those made on behalf of the Trust, 
are under the general supervision of Sherman B. Russ, Vice President of the 
Manager and the Trust. Mr. Russ joined the Manager in 1983. 
    
Day-to-day management of the Trust is the responsibility of Mr. Russ. In 
certain instances where Mr. Russ is unavailable, primary responsibility for the 
day-to-day management of the Trust may be assumed temporarily by Richard A. 
Schlanger who joined the Manager in 1988 and is a Vice President. 

In addition to the Trust, the Manager also manages and serves as the investment 
adviser for other mutual funds and is an investment adviser to certain other 
institutional accounts. The Manager's and PFD's executive offices are located 
at 60 State Street, Boston, Massachusetts 02109. 

Under the terms of its contract with the Trust, the Manager assists in the 
management of the Trust and is authorized in its discretion to buy and sell 
securities for the account of the Trust, subject to the right of the Trust's 
Trustees to disapprove any such purchase or sale. The Manager pays all the 
ordinary operating expenses, including executive salaries and the rental of 
office space related to its services for the Trust, with the exception of the 
following which are to be paid by the Trust: (a) charges and expenses for fund 
accounting, pricing and appraisal services and related overhead, including, to 
the extent such services are performed by personnel of the Manager or its 
affiliates, office space and facilities and personnel compensation, training 
and benefits; (b) the charges and expenses of auditors; (c) the charges and 
expenses of any custodian, transfer agent, plan agent, dividend disbursing 
agent and registrar appointed by the Trust with respect to shares of the Trust; 
(d) issue and transfer taxes, chargeable to the Trust in connection with 
securities transactions to which the Trust is a party; (e) insurance premiums, 
interest charges, dues and fees for membership in trade associations, and all 
taxes and corporate fees payable by the Trust to federal, state or other 
governmental agencies; (f) fees and expenses involved in registering and 
maintaining registrations of the Trust and/or its shares with the SEC, 
individual states or blue sky securities agencies, territories and foreign 
countries, including the preparation of Prospectuses and Statements of 
Additional Information for filing with the SEC; (g) all expenses of 
shareholders' and Trustees' meetings and of preparing, printing and 
distributing prospectuses, notices, proxy statements and all reports to 
shareholders and to governmental agencies; (h) charges and expenses of legal 
counsel to the Trust and to Trustees; (i) distribution fees paid by the Trust 
in accordance with Rule 12b-1 promulgated by the SEC pursuant to the 1940 Act; 
(j) compensation of those Trustees of the Trust who are not affiliated with or 
interested persons of PMC, the Trust (other than as Trustees), PGI or PFD; (k) 
the cost of preparing and printing share certificates; and (l) interest on 
borrowed money, if any. The Trust also pays all brokers' and underwriting 
commissions chargeable to the Trust in connection with its portfolio 
transactions. 

Orders for the Trust's portfolio securities transactions are placed by the 
Manager, which strives to obtain the best price and execution for each 
transaction. In circumstances where two or more broker-dealers are in a 
position to offer comparable prices and execution, consideration may be given 
to whether the broker-dealer provides brokerage or research services or sells 
shares of the Pioneer mutual funds for which PGI or any affiliate or subsidiary 
serves as investment adviser or manager. See the Statement of Additional 
Information for a further description of PMC's brokerage allocation practices. 

As compensation for its management services and certain expenses which the 
Manager incurs, the Manager is entitled to a management fee equal to 0.50% per 
annum of the Trust's average daily net assets. The fee is normally computed 
daily and paid monthly. 

During the fiscal year ended December 31, 1994, the Trust incurred net expenses 
of $1,414,094, including management fees paid or payable to the Manager of 
$536,625 after reduction pursuant to the Manager's voluntary expense limitation 
agreement. 

The Manager has agreed not to impose a portion of its management fee and to 
make other arrangements, if necessary to limit certain expenses of the Trust to 
the extent required to reduce Class A expenses to 1.00% of the average daily 
net assets attributable to the Class A shares; the portion of the Trust 
expenses attributable to the Class B shares will only be reduced to the extent 
it is reduced for the Class A shares. This agreement is voluntary and temporary 
and may be terminated by the Manager at any time. During the fiscal year ended 
December 31, 1994, this agreement resulted in a reduction of the Trust's 
management fee of $155,511. 

V. TRUST SHARE ALTERNATIVES 

The Trust continuously offers two Classes of shares designated as Class A and 
Class B shares, as described more fully in "How to Buy Fund Shares." If you do 
not specify in your instructions to the Trust which Class of shares you wish to 
purchase, exchange or redeem, the Trust will assume that your instructions 
apply to Class A shares. 

Class A Shares. If you invest less than $1 million in Class A shares, you will 
pay an initial sales charge. Certain purchases may qualify for reduced initial 
sales charges. If you invest $1 million or more in Class A shares, no sales 
charge will be imposed at the time of purchase. However, shares redeemed within 
12 months of purchase may be subject to a contingent deferred sales charge 
("CDSC"). Class A shares are subject to distribution and service fees at a 
combined annual rate of up to 0.25% of the Trust's average daily net assets 
attributable to Class A shares. 

Class B Shares. If you plan to invest up to $250,000, Class B shares are 
available to you. Class B shares are sold 

                                        6 
<PAGE> 
without an initial sales charge, but are subject to a CDSC of up to 4% if 
redeemed within six years. Class B shares are subject to distribution and 
service fees at a combined annual rate of 1.00% of the Trust's average daily 
net assets attributable to Class B shares. Your entire investment in Class B 
shares is available to work for you from the time you make your investment, but 
the higher distribution fee paid by Class B shares will cause your Class B 
shares (until conversion) to have a higher expense ratio and to pay lower 
dividends, to the extent dividends are paid, than Class A shares. Class B 
shares will automatically convert to Class A shares, based on relative net 
asset value, eight years after the initial purchase. 

Purchasing Class A or Class B Shares. The decision as to which Class to 
purchase depends on the amount you invest, the intended length of the 
investment and your personal situation. If you are making an investment that 
qualifies for reduced sales charges, you might consider Class A shares. If you 
prefer not to pay an initial sales charge on an investment of $250,000 or less 
and you plan to hold the investment for at least six years, you might consider 
Class B shares. 

Investment dealers and their representatives may receive different compensation 
depending on which Class of shares they sell. Shares may be exchanged only for 
shares of the same Class of another Pioneer mutual fund and shares acquired in 
the exchange will continue to be subject to any CDSC applicable to the shares 
of the Trust originally purchased. Shares sold outside the U.S. to persons who 
are not U.S. citizens may be subject to different sales charges, CDSCs and 
dealer compensation arrangements in accordance with local laws and business 
practices. 

VI. SHARE PRICE 

Shares of the Trust are sold at the public offering price, which is the net 
asset value per share plus the applicable sales charge. Net asset value per 
share of a Class of the Trust is determined by dividing the fair market value 
of its assets, less liabilities attributable to that Class, by the number of 
shares of that Class outstanding. The net asset value is computed once daily, 
on each day the New York Stock Exchange (the "Exchange") is open, as of the 
close of regular trading on the Exchange. 

VII. HOW TO BUY TRUST SHARES 

You may buy Trust shares at the public offering price from any securities 
broker-dealer which has a sales agreement with PFD. If you do not have a 
securities broker-dealer, please call 1-800-225-6292 for assistance. 

The minimum initial investment is $1,000 for Class A and Class B shares except 
as specified below. The minimum initial investment is $50 for Class A accounts 
being established to utilize monthly bank drafts, government allotments, 
payroll deduction and other similar automatic investment plans. Separate 
minimum investment requirements apply to retirement plans and to telephone and 
wire orders placed by broker-dealers; no sales charges or minimum requirements 
apply to the reinvestment of dividends or capital gains distributions. The 
minimum subsequent investment is $50 for Class A shares and $500 for Class B 
shares except that the subsequent minimum investment amount for Class B share 
accounts may be as little as $50 if an automatic investment plan is established 
(see "Automatic Investment Plans"). 

Class A Shares 

You may buy Class A shares at the public offering price, that is, at the net 
asset value per share next computed after receipt of a purchase order, plus a 
sales charge as follows: 
<TABLE>
<CAPTION>
                                                          Dealer 
                              Sales Charge as % of       Allowance 
                                             Net         as a % of 
                             Offering      Amount        Offering 
   Amount of Purchase         Price       Invested         Price 
<S>                           <C>         <C>             <C>
Less than $100,000             4.50%        4.71%          4.00% 
$100,000 but less than 
  $250,000                     3.50         3.63           3.00 
$250,000 but less than 
  $500,000                     2.50         2.56           2.00 
$500,000 but less than 
  $1,000,000                   2.00         2.04           1.75 
$1,000,000 or more              -0-          -0-           see below 
</TABLE>
   
No sales charge is payable at the time of purchase on investments of $1,000,000 
or more or for participants in certain group plans (described below) subject to 
a CDSC of 1% which may be imposed in the event of a redemption of Class A 
shares within 12 months of purchase. See "How to Sell Trust Shares." PFD may, 
in its discretion, pay a commission to broker-dealers who initiate and are 
responsible for such purchases as follows: 1% on the first $1 million invested; 
0.50% on the next $4 million; and 0.10% on the excess over $5 million. These 
commissions will not be paid if the purchaser is affiliated with the 
broker-dealer or if the purchase represents the reinvestment of a redemption 
made during the previous 12 calendar months. Broker-dealers who receive a 
commission in connection with Class A share purchases at net asset value by 
401(a) or 401(k) retirement plans with 1,000 or more eligible participants or 
with at least $10 million in plan assets will be required to return any 
commission paid or a pro rata portion thereof if the retirement plan redeems 
its shares within 12 months of purchase. See also "How to Sell Trust Shares." 
In connection with PGI's acquisition of Mutual of Omaha Fund Management Company 
and contingent upon the achievement of certain sales objectives, PFD pays to 
Mutual of Omaha Investor Services, Inc. 50% of PFD's retention of any sales 
commission on sales of the Fund's Class A shares through such dealer. 
    
The schedule of sales charges above is applicable to purchases of Class A 
shares of the Trust by an (i) an individual, (ii) an individual and his or her 
spouse and children under the age of 21 and (iii) a trustee or other fiduciary 
of a trust estate or fiduciary account or related trusts or accounts including 
pension, profit-sharing and other employee benefit trusts qualified under 
Section 401 or 408 of the Internal Revenue Code of 1986, as amended (the 
"Code"), although more than one beneficiary is involved. The sales charges 
applicable to a current purchase of Class A shares of the Trust by a person 
listed above is determined by adding the value of shares to be purchased to the 
aggregate value (at the then current 

                                        7 
<PAGE> 
offering price) of shares of any of the other Pioneer mutual funds previously 
purchased and then owned (except the Class A shares of Pioneer Money Market 
Trust), provided PFD is notified by such person or his or her broker-dealer 
each time a purchase is made which would qualify. Pioneer mutual funds include 
all mutual funds for which PFD serves as principal underwriter. See the "Letter 
of Intention" section of the Account Application. 

Qualifying for a Reduced Sales Charge. Class A shares of the Trust may be sold 
at a reduced or eliminated sales charge to certain group plans ("Group Plans") 
under which a sponsoring organization makes recommendations to, permits group 
solicitation of, or otherwise facilitates purchases by, its employees, members 
or participants. Class A shares of the Trust may be sold at net asset value per 
share without a sales charge to Optional Retirement Program participants if (i) 
the employer has authorized a limited number of investment company providers 
for the Program, (ii) all authorized investment company providers offer their 
shares to Program participants at net asset value, (iii) the employer has 
agreed in writing to actively promote the authorized investment providers to 
Program participants and (iv) the Program provides for a matching contribution 
for each participant contribution. Information about such arrangements is 
available from PFD. 

Class A shares of the Trust may be sold at net asset value per share without a 
sales charge to: (a) current or former Trustees and officers of the Trust and 
partners and employees of its legal counsel; (b) current or former directors, 
officers, employees or sales representatives of PGI or its subsidiaries; (c) 
current or former directors, officers, employees or sales representatives of 
any subadviser or predecessor investment adviser to any investment company for 
which the Manager serves as investment adviser, and the subsidiaries or 
affiliates of such persons; (d) current or former officers, partners, employees 
or registered representatives of broker-dealers which have entered into sales 
agreements with PFD; (e) members of the immediate families of any of the 
persons above; (f) any trust, custodian, pension, profit-sharing or other 
benefit plan of the foregoing persons; (g) insurance company separate accounts; 
(h) certain "wrap accounts" for the benefit of clients of financial planners 
adhering to standards established by PFD; (i) other funds and accounts for 
which the Manager or any of its affiliates serves as investment adviser or 
manager; and (j) certain unit investment trusts. Shares so purchased are 
purchased for investment purposes and may not be resold except through 
redemption or repurchase by or on behalf of the Trust. The availability of this 
privilege is conditioned upon the receipt by PFD of written notification of 
eligibility. Shares may also be sold at net asset value in connection with 
certain reorganization, liquidation, or acquisition transactions involving 
other investment companies or personal holding companies. 

Shares of the Trust may also be sold at net asset value per share without a 
sales charge to clients of a broker-dealer who invest the proceeds from the 
sale or redemption of shares of another investment company, provided that the 
broker-dealer can document that the sale or redemption was complete within 60 
days immediatly preceding the purchase of shares of the Trust. Further details 
may be obtained from PFD. 

Reduced sales charges for Class A shares are available through an agreement to 
purchase a specified quantity of Trust shares over a designated 13-month period 
by completing the "Letter of Intention" section of the Account Application. 
Information about the Letter of Intention Procedure, including its terms, is 
contained in the Statement of Additional Information. 

Class B Shares 
You may buy Class B shares at net asset value without the imposition of an 
initial sales charge. However, Class B shares redeemed within six years of 
purchase will be subject to a CDSC at the rates shown in the table below. The 
charge will be assessed on the amount equal to the lesser of the current market 
value or the original purchase cost of the shares being redeemed. No CDSC will 
be imposed on increases in account value above the initial purchase price, 
including shares derived from the reinvestment of dividends or capital gains 
distributions. 

The amount of the CDSC, if any, will vary depending on the number of years from 
the time of purchase until the time of redemption of Class B shares. For the 
purpose of determining the number of years from the time of any purchase, all 
payments during a quarter will be aggregated and deemed to have been made on 
the first day of that quarter. In processing redemptions of Class B shares, the 
Trust will first redeem shares not subject to any CDSC, and then shares held 
longest during the six-year period. As a result, you will pay the lowest 
possible CDSC. 
<TABLE>
<CAPTION>
Year Since                       CDSC as a Percentage of Dollar 
Purchase                              Amount Subject to CDSC 
<S>                                           <C>
First                                         4.0% 
Second                                        4.0% 
Third                                         3.0% 
Fourth                                        3.0% 
Fifth                                         2.0% 
Sixth                                         1.0% 
Seventh and thereafter                        none 
</TABLE>
Proceeds from the CDSC are paid to PFD and are used in whole or in part to 
defray PFD's expenses related to providing distribution-related services to the 
Trust in connection with the sale of Class B shares, including the payment of 
compensation to broker-dealers. 

Class B shares will automatically convert into Class A shares at the end of the 
calendar quarter that is eight years after the purchase date, except as noted 
below. Class B shares acquired by exchange from Class B shares of another 
Pioneer fund will convert into Class A shares based on the date of the initial 
purchase and the applicable CDSC. Class B shares acquired through reinvestment 
of distributions will convert into Class A shares based on the date of the 
initial purchase to which such shares relate. For this purpose, Class B shares 
acquired through reinvestment of distributions will be attributed to particular 
purchases of Class B shares in accordance with such procedures as the Trustees 
may determine from time to time. The conversion of Class B shares to Class A 
shares is subject to the continuing availability of a ruling from the Internal 
Revenue Service, for which the Trust is applying, or an opinion of counsel that 
such conversions will not constitute taxable events for federal tax 

                                        8 
<PAGE> 
purposes. There can be no assurance that such ruling or opinion will be 
available. The conversion of Class B shares to Class A shares will not occur if 
such ruling or opinion is not available and, therefore, Class B shares would 
continue to be subject to higher expenses than Class A shares for an 
indeterminate period. 

Waiver or Reduction of Contingent Deferred Sales 
Charge. The CDSC on Class B shares and on any Class A shares subject to a CDSC 
may be waived or reduced for non-retirement accounts if: (a) the redemption 
results from the death of all registered owners of an account (in the case of 
UGMAs, UTMAs and trust accounts, waiver applies upon the death of all 
beneficial owners) or a total and permanent disability (as defined in Section 
72 of the Code) of all registered owners occurring after the purchase of the 
shares being redeemed or (b) the redemption is made in connection with limited 
automatic redemptions as set forth in "Systematic Withdrawal Plans" (limited in 
any year to 10% of the value of the account in the Trust at the time the 
withdrawal plan is established). 

The CDSC on Class B shares and on any Class A shares subject to a CDSC may be 
waived or reduced for retirement plan accounts if: (a) the redemption results 
from the death or a total and permanent disability (as defined in Section 72 of 
the Code) occurring after the purchase of the shares being redeemed of a 
shareholder or participant in an employer-sponsored retirement plan; (b) the 
distribution is to a participant in an IRA, 403(b) or employer-sponsored 
retirement plan, is part of a series of substantially equal payments made over 
the life expectancy of the participant or the joint life expectancy of the 
participant and his or her beneficiary or as scheduled periodic payments to a 
participant (limited in any year to 10% of the value of the participant's 
account at the time the distribution amount is established; a required minimum 
distribution due to the participant's attainment of age 70-1/2 may exceed the 
10% limit only if the distribution amount is based on plan assets held by 
Pioneer); (c) the distribution is from a 401(a) or 401(k) retirement plan and 
is a return of excess employee deferrals or employee contributions or a 
qualifying hardship distribution as defined by the Code or results from a 
termination of employment (limited with respect to a termination to 10% per 
year of the value of the plan's assets in the Fund as of the later of the prior 
December 31 or the date the account was established unless the plan's assets 
are being rolled over to or reinvested in the same class of shares of a Pioneer 
mutual fund subject to the CDSC of the shares originally held); (d) the 
distribution is from an IRA, 403(b) or employer-sponsored retirement plan and 
is to be rolled over to or reinvested in the same class of shares in a Pioneer 
mutual fund and which will be subject to the applicable CDSC upon redemption; 
(e) the distribution is in the form of a loan to a participant in a plan which 
permits loans (each repayment of the loan will constitute a new sale which will 
be subject to the applicable CDSC upon redemption); or (f) the distribution is 
from a qualified defined contribution plan and represents a participant's 
directed transfer (provided that this privilege has been pre-authorized through 
a prior agreement with PFD regarding participant directed transfers). 

The CDSC on Class B shares and on any Class A shares subject to a CDSC may be 
waived or reduced for either non-retirement or retirement plan accounts if: 
(a) the redemption is made by any state, county, or city, or any 
instrumentality, department, authority, or agency thereof, which is prohibited 
by applicable laws from paying a CDSC in connection with the acquisition of 
shares of any registered investment management company; or (b) the redemption 
is made pursuant to the Trust's right to liquidate or involuntarily redeem 
shares in a shareholder's account. 

Broker-Dealers. An order for either Class of Trust shares received by PFD from 
a broker-dealer prior to the close of regular trading on the Exchange is 
confirmed at the price appropriate for that Class as determined at the close of 
regular trading on the Exchange on the day the order is received, provided the 
order is received prior to PFD's close of business (usually, 5:30 p.m. Eastern 
Time). It is the responsibility of broker-dealers to transmit orders so that 
they will be received by PFD prior to its close of business. 

General. The Trust reserves the right in its sole discretion to withdraw all or 
any part of the offering of shares when, in the judgment of the Trust's 
management, such withdrawal is in the best interest of the Trust. An order to 
purchase shares is not binding on, and may be rejected by, PFD until it has 
been confirmed in writing by PFD and payment has been received. 

VIII. HOW TO SELL TRUST SHARES 

You can arrange to sell (redeem) Trust shares on any day the Exchange is open 
by selling (redeeming) either some or all of your shares to the Trust. 

You may sell your shares either through your broker-dealer or directly to the 
Trust. 

* If you are selling shares from a retirement account, you must make your 
request in writing (except for exchanges to other Pioneer funds which can be 
requested by phone or in writing). Call 1-800-622-0176 for a retirement 
distribution form. 

* If you are selling shares from a non-retirement account, you may use any of 
the methods described below. 

Your shares will be sold at the share price next calculated after your order is 
received and accepted less any applicable CDSC. Sale proceeds generally will be 
sent to you in cash, normally within seven days after your order is accepted. 
The Trust reserves the right to withhold payment of the sale proceeds until 
checks received by the Trust in payment for the shares being sold have cleared, 
which may take up to 15 calendar days from the purchase date. 

In Writing. You may always sell your shares by delivering a written request, 
signed by all registered owners, in good order to Pioneering Services 
Corporation ("PSC"), however, you must use a written request, including a 
signature guarantee, to sell your shares if any of the following situations 
applies: 

                                        9 
<PAGE> 
* you wish to sell over $50,000 worth of shares, 

* your account registration or address has changed within the last 30 days, 

* the check is not being mailed to the address on your account (address of 
record), 

* the check is not being made out to the account owners, or 

* the sale proceeds are being transferred to a Pioneer account with a different 
registration. 

Your request should include your name, the Trust's name, your Trust account 
number, the Class of shares to be redeemed, the dollar amount or number of 
shares to be redeemed, and any other applicable requirements as described 
below. Unless instructed otherwise, Pioneer will send the proceeds of the sale 
to the address of record. Fiduciaries or corporations are required to submit 
additional documents. For more information, contact PSC at 1-800-225-6292. 

Written requests will not be processed until they are received in good order 
and accepted by PSC. Good order means that there are no outstanding claims or 
requests to hold redemptions on the account, certificates are endorsed by the 
record owner(s) exactly as the shares are registered and the signature(s) are 
guaranteed by an eligible guarantor. You should be able to obtain a signature 
guarantee from a bank, broker, dealer, credit union (if authorized under state 
law), securities exchange or association, clearing agency or savings 
association. A notary public cannot provide a signature guarantee. Signature 
guarantees are not accepted by facsimile (fax). For additional information 
about the necessary documentation for redemption by mail, please contact PSC at 
1-800-225-6292. 

By Telephone or by Fax. Your account is automatically authorized to have the 
telephone redemption privilege unless you indicated otherwise on your Account 
Application or by writing to PSC. Proper account identification will be 
required for each telephone redemption. The telephone redemption option is not 
available to retirement plan accounts. A maximum of $50,000 may be redeemed by 
telephone or fax and the proceeds may be received by check or by bank wire. To 
receive the proceeds by check: the check must be made payable exactly as the 
account is registered and the check must be sent to the address of record which 
must not have changed in the last 30 days. To receive the proceeds by bank 
wire: the wire must be sent to the bank wire address of record which must have 
been properly pre-designated either on your Account Application or on an 
Account Options Form and which must not have changed in the last 30 days. To 
redeem by fax send your redemption request to 1-800-225-4240. You may always 
elect to deliver redemption instructions to PSC by mail. See "Telephone 
Transactions and Related Liabilities" below. Telephone and fax redemptions will 
be priced as described above. 

Selling Shares Through Your Broker-Dealer. The Trust has authorized PFD to act 
as its agent in the repurchase shares of the Trust from qualified 
broker-dealers and reserves the right to terminate this procedure at any time. 
Your broker-dealer must receive your request before the close of business on 
the Exchange and transmit it to PFD before PFD's close of business to receive 
that day's redemption price. Your broker-dealer is responsible for providing 
all necessary documentation to PFD and may charge you for its services. 

Small Accounts. The minimum account value is $500. If you hold shares of the 
Trust in an account with a net asset value of less than the minimum required 
amount due to redemptions or exchanges, the Trust may redeem the shares held in 
this account at net asset value if you have not increased the net asset value 
of the account to at least the minimum required amount within six months of 
notice by the Trust to you of the Trust's intention to redeem the shares. 

CDSC on Class A Shares. Purchases of Class A shares of $1,000,000 or more, or 
by participants in a Group Plan which were not subject to an initial sales 
charge, may be subject to a CDSC upon redemption. A CDSC is payable to PFD on 
these investments in the event of a share redemption within 12 months following 
the share purchase, at the rate of 1% of the lesser of the value of the shares 
redeemed (exclusive of reinvested dividend and capital gain distributions) or 
the total cost of such shares. Shares subject to the CDSC which are exchanged 
into another Pioneer fund will continue to be subject to the CDSC until the 
original 12-month period expires. However, no CDSC is payable with respect to 
purchases of Class A shares by 401(a) or 401(k) retirement plans with 1,000 or 
more eligible participants or with at least $10 million in plan assets. 

General.  Redemptions may be suspended or payment postponed during any period 
in which any of the following conditions exist: the Exchange is closed or 
trading on the Exchange is restricted; an emergency exists as a result of which 
disposal by the Trust of securities owned by it is not reasonably practicable 
or it is not reasonably practicable for the Trust to fairly determine the value 
of the net assets of its portfolio; or the SEC, by order, so permits. 

Redemptions and repurchases are taxable transactions to shareholders. The net 
asset value per share received upon redemption or repurchase may be more or 
less than the cost of shares to an investor, depending on the market value of 
the portfolio at the time of redemption or repurchase. 

IX. HOW TO EXCHANGE TRUST SHARES 

Written Exchanges. You may exchange your shares by sending a letter of 
instruction to PSC. Your letter should include your name, the name of the Trust 
out of which you wish to exchange and the name of the fund into which you wish 
to exchange, your fund account number(s), the Class of shares to be exchanged 
and the dollar amount or number of shares to be exchanged. Written exchange 
requests must 
be signed by all record owner(s) exactly as the shares are registered. 

Telephone Exchanges. Your account is automatically authorized to have the 
telephone exchange privilege unless you indicated otherwise on your Account 
application or by writing to 

                                       10 
<PAGE> 
PSC. Proper account identification will be required for each telephone 
exchange. Telephone exchanges may not exceed $500,000 per account per day. All 
telephone exchange requests will be recorded. See "Telephone Transactions and 
Related Liabilities" below. 

Automatic Exchanges. You may automatically exchange shares from one Pioneer 
account for shares of the same Class in another Pioneer account on a monthly or 
quarterly basis. The accounts must have identical registrations and the 
originating account must have a minimum balance of $5,000. The exchange will be 
effective on the 18th day of the month. 

General. Exchanges must be at least $1,000. You may exchange your investment 
from one Class of Trust shares at net asset value, without a sales charge, for 
shares of the same Class of any other Pioneer mutual fund. Not all Pioneer 
mutual funds offer more than one Class of shares. A new Pioneer account opened 
through an exchange must have a registration identical to that on the original 
account. 

Class A or Class B shares which would normally be subject to a CDSC upon 
redemption will not be charged the applicable CDSC at the time of an exchange. 
Shares acquired in an exchange will be subject to the CDSC of the shares 
originally held. For purposes of determining the amount of any applicable CDSC, 
the length of time you have owned Class B shares acquired by exchange will be 
measured from the date you acquired the original shares and will not be 
affected by any subsequent exchange. 

Exchange requests received by PSC before 4:00 p.m. Eastern Time, will be 
effective on that day if the requirements below have been met, otherwise, they 
will be effective on the next business day. PSC will process exchanges only 
after receiving an exchange request in good order. There are currently no fees 
or sales charges imposed at the time of an exchange. An exchange of shares may 
be made only in states where legally permitted. For federal and (generally) 
state income tax purposes, an exchange is considered to be a sale of the shares 
of the fund exchanged and a purchase of shares in another fund. Therefore, an 
exchange could result in a gain or loss on the shares sold, depending on the 
tax basis of these shares and the timing of the transaction, and special tax 
rules may apply. 

You should consider the differences in objectives and policies of the Pioneer 
mutual funds, as described in each fund's current prospectus, before making any 
exchange. To prevent abuse of the exchange privilege to the detriment of other 
Trust shareholders, the Trust and PFD reserve the right to limit the number 
and/or frequency of exchanges and/or to charge a fee for exchanges. The 
exchange privilege may be changed or discontinued and may be subject to 
additional limitations, including certain restrictions on purchases by market 
timer accounts. 

X. DISTRIBUTION PLANS 

The Trust has adopted a Plan of Distribution for both Class A shares ("Class A 
Plan") and Class B shares ("Class B Plan") in accordance with Rule 12b-1 under 
the 1940 Act pursuant to which certain distribution and service fees are paid. 

Pursuant to the Class A Plan, the Trust reimburses PFD for its actual 
expenditures to finance any activity primarily intended to result in the sale 
of Class A shares or to provide services to holders of Class A shares, provided 
the categories of expenses for which reimbursement is made are approved by the 
Trust's Board of Trustees. As of the date of this Prospectus, the Board of 
Trustees has approved the following categories of expenses for Class A shares 
of the Trust: (i) a service fee to be paid to qualified broker-dealers in an 
amount not to exceed 0.25% per annum of the Trust's daily net assets 
attributable to Class A shares; (ii) reimbursement to PFD for its expenditures 
for broker-dealer commissions and employee compensation on certain sales of the 
Trust's Class A shares with no initial sales charge (See "How to Buy Trust 
Shares"); and (iii) reimbursement to PFD for expenses incurred in providing 
services to Class A shareholders and supporting broker-dealers and other 
organizations (such as banks and trust companies) in their efforts to provide 
such services. Banks are currently prohibited under the Glass-Steagall Act 
from providing certain underwriting or distribution services. If a bank was 
prohibited from acting in any capacity or providing any of the described 
services, management would consider what action, if any, would be appropriate. 

Expenditures of the Trust pursuant to the Class A Plan are accrued daily and 
may not exceed 0.25% of the Trust's average daily net assets attributable to 
Class A shares. Distribution expenses of PFD are expected to substantially 
exceed the distribution fees paid by the Trust in a given year. The Class A 
Plan may not be amended to increase materially the annual percentage limitation 
of average net assets which may be spent for the services described therein 
without approval of the shareholders of the Trust. The Class A Plan does not 
provide for the carryover of reimbursable expenses beyond 12 months from the 
time the Trust is first invoiced for an expense. For the fiscal year ended 
December 31, 1994, there was an allowable carryover of distribution expenses 
reimbursable to PFD of $38,421 (approximately 0.20% of the net assets 
attributable to the Class A shares of the Trust). 

The Class B Plan provides that the Trust will pay a distribution fee at the 
annual rate of 0.75% of the Trust's average daily net assets attributable to 
Class B shares and will pay PFD a service fee at the annual rate of 0.25% of 
the Trust's average daily net assets attributable to Class B shares. The 
distribution fee is intended to compensate PFD for its distribution services to 
the Trust. The service fee is intended to be additional compensation for 
personal services and/or account maintenance services with respect to Class B 
shares. PFD also receives the proceeds of any CDSC imposed on the redemption of 
Class B shares. 

Commissions of 4%, equal to 3.75% of the amount invested and a first year's 
service fee equal to 0.25% of the amount invested in Class B shares, are paid 
to broker-dealers who have selling agreements with PFD. PFD may advance to 
dealers the first year service fee at a rate up to 0.25% of the purchase price 
of such shares and, as compensation therefor, PFD may retain the service fee 
paid by the Trust with respect to such shares for the first year after 
purchase. Dealers will become eligible for additional service 

                                       11 
<PAGE> 
fees with respect to such shares commencing in the 13th month following the 
purchase. Dealers may from time to time be required to meet certain criteria in 
order to receive service fees. PFD or its affiliates are entitled to retain all 
service fees payable under the Class B Plan for which there is no dealer of 
record or for which qualification standards have not been met as partial 
consideration for personal services and/or account maintenance services 
performed by PFD or its affiliates for shareholder accounts. 

XI. DIVIDENDS, DISTRIBUTIONS AND TAXATION 

The Trust has elected to be treated, has qualified, and intends to qualify each 
year as a "regulated investment company" under Subchapter M of the Code, so 
that it will not pay federal income taxes on income and capital gains 
distributed to shareholders at least annually. 

Under the Code, the Trust will be subject to a nondeductible 4% excise tax on a 
portion of its undistributed income and capital gains if it fails to meet 
certain distribution requirements for each calendar year. The Trust intends to 
make distributions in a timely manner and accordingly does not expect to be 
subject to the excise tax. 

Each business day the Trust declares a dividend consisting of substantially all 
of the Trust's net investment income (earned interest income less expenses). 
Shareholders begin earning dividends on the first business day following 
receipt of payment for purchased shares. Shares continue to earn dividends up 
to and including the date of redemption. Dividends are normally paid on the 
last business day of the month or shortly thereafter. Monthly distributions, 
which consist of net investment income and may also include a portion of 
original issue discount or market discount and any net short-term capital gains 
realized by the Trust, are taxable as ordinary income. Net long-term capital 
gains, if any, will be distributed annually, in December, or at such additional 
times as may be necessary to avoid federal income or excise tax (after taking 
into account any capital loss carryforwards) and will be taxable as long-term 
capital gains regardless of the shareholder's holding period for the shares. 
Unless shareholders specify otherwise, all distributions will be automatically 
reinvested in additional full and fractional shares of the Trust. For federal 
income tax purposes, all dividends are taxable as described above whether a 
shareholder takes them in cash or reinvests them in additional shares of the 
Trust. Information as to the federal tax status of dividends and distributions 
will be provided annually. For further information on the distribution options 
available to shareholders, see "Distribution Options" and "Directed Dividends" 
below. 

Dividends and other distributions and the proceeds of redemptions or 
repurchases of Trust shares paid to individuals and other non-exempt payees 
will be subject to a 31% federal backup withholding tax if the Trust is not 
provided with the shareholder's correct taxpayer identification number and 
certification that the number is correct and the shareholder is not subject to 
backup withholding or the Trust receives notice from the Internal Revenue 
Service (the "IRS") or a broker that such withholding applies. Please refer to 
the Account Application for additional information. 

The description above relates only to U.S. federal income tax consequences for 
shareholders who are U.S. persons, i.e., U.S. citizens or residents or U.S. 
corporations, partnerships, trust or estates, and who are subject to U.S. 
federal income tax. Non-U.S. shareholders and tax-exempt shareholders are 
subject to different tax treatment that is not described above. Shareholders 
should consult their own tax advisors regarding state, local and other 
applicable tax laws. 

XII. SHAREHOLDER SERVICES 

PSC is the shareholder services and transfer agent for shares of the Trust. 
PSC, a Massachusetts corporation, is a wholly-owned subsidiary of PGI. PSC's 
offices are located at 60 State Street, Boston, Massachusetts 02109, and 
inquiries to PSC should be mailed to Pioneering Services Corporation, P.O. Box 
9014, Boston, Massachusetts 02205-9014. Brown Brothers Harriman & Co. (the 
"Custodian") serves as custodian of the Trust's portfolio securities. The 
principal business address of the mutual fund division of the Custodian is 40 
Water Street, Boston, Massachusetts 02109. 

Account and Confirmation Statements 

PSC maintains an account for each shareholder and all transactions of the 
shareholder are recorded in this account. Confirmation statements showing 
details of transactions are sent to shareholders as transactions occur, except 
Automatic Investment Plan transactions which are confirmed quarterly. The 
Pioneer Combined Account Statement, mailed quarterly, is available to 
shareholders who have more than one Pioneer account. 

Shareholders whose shares are held in the name of an investment broker-dealer 
or other party will not normally have an account with the Trust and might not 
be able to utilize some of the services available to shareholders of record. 
Examples of services which might not be available are investment or redemption 
of shares by mail or telephone, automatic reinvestment of dividends and capital 
gains distributions, withdrawal plans, Letters of Intention, Rights of 
Accumulation, telephone exchanges, and newsletters. 

Additional Investments 

You may add to your account by sending a check (minimum of $50 for Class A 
shares and $500 for Class B shares) to PSC (account number and Class of shares 
should be clearly indicated). The bottom portion of a confirmation statement 
may be used as a remittance slip to make additional investments. Additions to 
your account, whether by check or through a Pioneer Investomatic Plan, are 
invested in full and fractional shares of the Trust at the applicable offering 
price in effect as of the close of regular trading on the Exchange on the day 
of receipt. 

Automatic Investment Plans 

You may arrange for regular automatic investments of $50 or more through 
government/military allotments, payroll deduction or through a Pioneer 
Investomatic Plan. A Pioneer Investomatic Plan provides for a monthly or 
quarterly investment by means of a pre-authorized draft drawn on a checking 
account. Pioneer Investomatic Plan investments are 

                                       12 
<PAGE> 
voluntary, and you may discontinue the plan at any time without penalty upon 30 
days' written notice. PSC acts as agent for the purchaser, the broker-dealer 
and PFD in maintaining these plans. 

Financial Reports and Tax Information 

As a shareholder, you will receive financial reports at least semiannually. In 
January of each year, the Trust will mail you information about the tax status 
of dividends and distributions. 

Distribution Options 

Dividends and capital gains distributions, if any, will automatically be 
invested in additional shares of the Trust, at the applicable net asset value 
per share, unless you indicate another option on the Account Application. 

Two other options available are (a) dividends in cash and capital gains 
distributions in additional shares; and (b) all dividends and capital gains 
distributions in cash. These two options are not available, however, for 
retirement plans or for an account with a net asset value of less than $500. 
Changes in your distribution options may be made by written request to PSC. 

Directed Dividends 

You may elect (in writing) to have the dividends paid by one Pioneer mutual 
fund account invested in a second Pioneer mutual fund account. The value of 
this second account must be at least $1,000 ($500 for Pioneer Fund or Pioneer 
II). Invested dividends may be in any amount, and there are no fees or charges 
for this service. Retirement plan shareholders may only direct dividends to 
accounts with identical registrations, i.e., PGA IRA Cust for John Smith may 
only go into another account registered PGA IRA Cust for John Smith. 

Direct Deposit 

If you have elected to take distributions, whether dividends or dividends and 
capital gains, in cash, or have established a Systematic Withdrawal Plan, you 
may choose to have those cash payments deposited directly into your savings, 
checking or NOW bank account. You may also establish this service by completing 
the appropriate section on the Account Application when opening a new account 
or the Account Options Form for an existing account. 

Voluntary Tax Withholding 

You may request (in writing) that PSC withhold 28% of the dividends and capital 
gains distributions paid from your account (before any reinvestment) and 
forward the amount withheld to the IRS as a credit against your federal income 
taxes. This option is not available for retirement plan accounts or for 
accounts subject to backup withholding. 

Telephone Transactions and Related Liabilities 

Your account is automatically authorized to have telephone transaction 
privileges unless you indicated otherwise on your Account Application or by 
writing to PSC. You may sell or exchange your Trust shares by telephone by 
calling 1-800-225-6292 between 8:00 a.m. and 8:00 p.m. Eastern Time on 
weekdays. See "Share Price" for more information. To confirm that each 
transaction instruction received by telephone is genuine, the Trust will record 
each telephone transaction, require the caller to provide the personal 
identification number (PIN) for the account and send you a written confirmation 
of each telephone transaction. Different procedures may apply to accounts that 
are registered to non-U.S. citizens or that are held in the name of an 
institution or in the name of an investment broker-dealer or other third-party. 
If reasonable procedures, such as those described above, are not followed, the 
Trust may be liable for any loss due to unauthorized or fraudulent 
instructions. The Trust may implement other procedures from time to time. In 
all other cases, neither the Trust, PSC or PFD will be responsible for the 
authenticity of instructions received by telephone, therefore, you bear the 
risk of loss for unauthorized or fraudulent telephone transactions. 

During times of economic turmoil or market volatility or as a result of severe 
weather or a natural disaster, it may be difficult to contact the Trust by 
telephone to institute a redemption or exchange. You should communicate with 
the Trust in writing if you are unable to reach the Trust by telephone. 

Retirement Plans 

You should contact the Retirement Plans Department of PSC at 1-800-622-0176 for 
information relating to retirement plans for businesses, age-weighted profit 
sharing plans, Simplified Employee Pension Plans, Individual Retirement 
Accounts (IRA's), and Section 403(b) retirement plans for employees of certain 
non-profit organizations and public school systems, all of which are available 
in conjunction with investments in the Trust. The Account Application enclosed 
with this Prospectus should not be used to establish any of these plans. 
Separate applications are required. 

Telecommunications for the Deaf (TDD) 
   
If you have a hearing disability and access to TDD keyboard equipment, you can 
call our TDD number toll-free at 1-800- 225-1997, weekdays from 8:30 a.m. to 
5:30 p.m. Eastern Time to contact our telephone representatives with questions 
about your account. 

Systematic Withdrawal Plans 

If your account has a total value of at least $10,000 you may establish a 
Systematic Withdrawal Plan ("SWP") providing for fixed payments at regular 
intervals. Withdrawals from Class B shares accounts are limited to 10% of the 
value of the account at the time the plan is implemented. See "Waiver or 
Reduction of Contingent Deferred Sales Charge" for more information. Periodic 
payments of $50 or more will be sent to you, or any person designated by you, 
monthly or quarterly and your periodic redemptions may be taxable to you. 
Payments can be made either by check or electronic transfer to a bank account 
designated by you. If you direct that withdrawal payments be made to another 
person after you have opened your account, a signature guarantee must accompany 
your instructions. Purchases of Class A shares of the Trust at a time when you 
have a SWP in effect may result in the payment of unnecessary sales charges and 
may, therefore, be disadvantageous. 

You may obtain additional information by calling PSC at 1-800-225-6292 or by 
referring to the Statement of Additional Information. 
    
                                       13 
<PAGE> 
Reinstatement Privilege (Class A Shares Only) 

If you redeem all or part of your Class A shares of the Trust, you may reinvest 
all or part of the redemption proceeds without a sales charge in Class A shares 
of the Trust if you send a written request to PSC not more than 90 days after 
your shares were redeemed. Your redemption proceeds will be reinvested at the 
next determined net asset value of the Class A shares of the Trust in effect 
immediately after receipt of the written request for reinstatement. You may 
realize a gain or loss for federal income tax purposes as a result of the 
redemption, and special tax rules may apply if a reinstatement occurs. Subject 
to the provisions outlined under "How to Exchange Trust Shares" above, you may 
also reinvest in Class A shares of other Pioneer mutual funds; in this case, 
you must meet the minimum investment requirement for each fund you enter. 

The 90-day reinstatement period may be extended by PFD for periods of up to one 
year for shareholders living in areas that have experienced a natural disaster, 
such as a flood, hurricane, tornado or earthquake. 

The options and services available to shareholders, including the terms of the 
Exchange Privilege and the Pioneer Investomatic Plan, may be revised, suspended 
or terminated at any time by PFD or by the Trust. You may establish the 
services described in this section when you open your account. You may also 
establish or revise many of them on an existing account by completing an 
Account Options Form, which you may request by calling 1-800-225-6292. 

XIII. THE TRUST 

Pioneer America Income Trust is an open-end, diversified management investment 
company (commonly referred to as a mutual fund) organized as a Massachusetts 
business trust on March 17, 1988. Prior to July 1, 1994 the Trust was named 
Pioneer U.S. Government Trust. The Trust has authorized an unlimited number of 
shares of beneficial interest. As an open-end management investment company, 
the Trust usually continuously offers its shares to the public and under normal 
conditions must redeem its shares upon the demand of any shareholder at the 
then current net asset value per share. See "How to Sell Trust Shares." The 
Trust is not required, and does not intend, to hold annual shareholder 
meetings, although special meetings may be called for the purposes of electing 
or removing Trustees, changing fundamental investment restrictions or approving 
a management or subadvisory contract. 

The Trustees have the authority, without further shareholder approval, to 
classify and reclassify the shares of the Trust, or any additional series of 
the Trust, into one or more classes. As of the date of this Prospectus, the 
Trustees have authorized the issuance of two classes of shares, designated 
Class A and Class B. The shares of each class represent an interest in the same 
portfolio of investments of the Trust. Each class has equal rights as to 
voting, redemption, dividends and liquidation, except that each class bears 
different distribution and transfer agent fees and may bear other expenses 
properly attributable to the particular class. Class A and Class B shareholders 
have exclusive voting rights with respect to the Rule 12b-1 distribution plans 
adopted by holders of those shares in connection with the distribution of 
shares. The Trust reserves the right to create and issue additional series of 
shares. 

When issued and paid for in accordance with the terms of the Prospectus and 
Statement of Additional Information, shares of the Trust are fully-paid and 
non-assessable by the Trust. Shares will remain on deposit with the Trust's 
transfer agent and certificates will not normally be issued. The Trust reserves 
the right to charge a fee for the issuance of certificates. 

XIV. INVESTMENT RESULTS 

The Trust may from time to time include yield information in advertisements or 
in information furnished generally to existing or proposed shareholders. Yield 
information is computed in accordance with the SEC's standardized yield 
formula. The calculation for all Classes is computed by dividing the net 
investment income per share of a Class during a base period of 30 days, or one 
month, by the maximum offering price per share of the applicable Class of the 
Trust on the last day of such base period. The resulting "30-day yield" is then 
annualized as described below. (Net investment income per share of a Class is 
determined by dividing the Trust's net investment income attributable to a 
Class during the base period by the average number of shares of that Class of 
the Trust.) The 30-day yield is then "annualized" by a computation that assumes 
that the net investment income per share of a Class is earned and reinvested 
for a six-month period at the same rate as during the 30-day base period and 
that the resulting six-month income will be generated over an addition six 
months. 

The average annual total return (for a designated period of time) on an 
investment in the Trust may also be included in advertisements, and furnished 
to existing or prospective shareholders. The average annual total return for 
each Class is computed in accordance with the SEC's standardized formula. The 
calculation for all Classes assumes the reinvestment of all dividends and 
distributions at net asset value. In addition, for Class A shares the 
calculation assumes the deduction of the maximum sales charge of 4.50%; for 
Class B shares the calculation reflects the deduction of any applicable 
contingent deferred sales charge. The periods illustrated would normally 
include one, five and ten years (or since the commencement of the public 
offering of the shares of a Class, if shorter) through the most recent calendar 
quarter. 

Yield and average annual total return quotations of the Trust do not reflect 
the impact of federal or state income taxes. 

One or more additional measures and assumptions, including but not limited to 
historical total returns; distribution returns; results of actual or 
hypothetical investments; 

                                       14 
<PAGE> 
changes in dividends, distributions or share values; or any graphic 
illustration of such data may also be used. These data may cover any period of 
the Trust's existence and may or may not include the impact of sales charges, 
taxes or other factors. 

Other investments or savings vehicles and/or unmanaged market indexes, 
indicators of economic activity or averages of mutual funds results may be 
cited or compared with the investment results of the Trust. Rankings or 
listings by magazines, newspapers or independent statistical or rating 
services, such as Lipper Analytical Services, Inc., may also be referenced. 

The Trust's investment results will vary from time to time depending on market 
conditions, the composition of the Trust's portfolio and operating expenses of 
the Trust. All quoted investment results are historical and should not be 
considered representative of what an investment in the Trust may earn in any 
future period. For further information about the calculation methods and uses 
of the Trust's investment results, see the Statement of Additional Information. 

                                       15 
<PAGE> 
Pioneer America 
Income Trust 
60 State Street 
Boston, Massachusetts 02109 

OFFICERS 
JOHN F. COGAN, JR., Chairman and President 
DAVID D. TRIPPLE, Executive Vice President 
SHERMAN B. RUSS, Vice President 
WILLIAM H. KEOUGH, Treasurer 
JOSEPH P. BARRI, Secretary 

INVESTMENT ADVISER 
PIONEERING MANAGEMENT CORPORATION 

CUSTODIAN 
BROWN BROTHERS HARRIMAN & CO. 

INDEPENDENT PUBLIC ACCOUNTANTS 
ARTHUR ANDERSEN LLP 

LEGAL COUNSEL 
HALE AND DORR 

PRINCIPAL UNDERWRITER 
PIONEER FUNDS DISTRIBUTOR, INC. 

SHAREHOLDER SERVICES AND TRANSFER AGENT 
PIONEERING SERVICES CORPORATION 
60 State Street 
Boston, Massachusetts 02109 
Telephone: 1-800-225-6292 

SERVICE INFORMATION 
If you would like information on the following, please call . . . 
Existing and new accounts, prospectuses, 
 applications and service forms 
 and telephone transactions ....................... 1-800-225-6292 
Automated fund yields, prices and account 
 information ...................................... 1-800-225-4321 
Retirement plans .................................. 1-800-622-0176 
Toll-free fax ......................................1-800-225-4240 
Telecommunications Device for the Deaf (TDD) ...... 1-800-225-1997 

0495-2460 
(C)Pioneer Funds Distributor, Inc. 

<PAGE>

                          PIONEER AMERICA INCOME TRUST
                                60 State Street
                          Boston, Massachusetts 02109

                      STATEMENT OF ADDITIONAL INFORMATION

   
                                 April 28, 1995

     This  Statement  of  Additional  Information  (Part  B of the  Registration
Statement)  is not a  Prospectus  but  should  be read in  conjunction  with the
Prospectus  dated April 28, 1995, as amended  and/or  supplemented  from time to
time (the "Prospectus"),  of Pioneer America Income Trust (the "Trust").  A copy
of the Prospectus can be obtained free of charge by calling Shareholder Services
at 1-800-225-6292 or by written request to the Trust at 60 State Street, Boston,
Massachusetts  02109.  The most recent Annual Report to Shareholders is attached
to this Statement of Additional  Information and is hereby  incorporated in this
Statement of Additional Information by reference.
    

                               TABLE OF CONTENTS

                                                                      Page

1.  Investment Policies and Restrictions...............................2
2.  Management of the Trust............................................7
   
3.  Investment Adviser.................................................13
4.  Principal Underwriter .............................................14
5.  Distribution Plans.................................................15
6.  Shareholder Servicing/Transfer Agent...............................17
7.  Custodian..........................................................17
8.  Independent Public Accountants.....................................18
9.  Portfolio Transactions.............................................18
10. Tax Status.........................................................19
11. Description of Shares..............................................22
12. Certain Liabilities................................................22
13. Letter of Intention................................................23
14. Systematic Withdrawal Plan.........................................24
15. Determination of Net Asset Value...................................25
16. Investment Results.................................................25
    

     Appendix A
                           -------------------------

THIS  STATEMENT OF ADDITIONAL  INFORMATION IS NOT A PROSPECTUS AND IS AUTHORIZED
FOR DISTRIBUTION TO PROSPECTIVE  INVESTORS ONLY IF PRECEDED OR ACCOMPANIED BY AN
EFFECTIVE PROSPECTUS.


<PAGE>



1.   INVESTMENT POLICIES AND RESTRICTIONS

   
     The Prospectus presents the investment  objective and principal  investment
policies of the Trust.  Other investment  policies and a further  description of
some of the policies described in the Prospectus appear below.
    

     The following  policies and restrictions  supplement those discussed in the
Prospectus.  Whenever  an  investment  policy  or  restriction  states a maximum
percentage  of the  Trust's  assets  that may be  invested  in any  security  or
presents  a  policy  regarding  quality   standards,   this  standard  or  other
restrictions  shall be  determined  immediately  after  and as a  result  of the
Trust's investment. Accordingly, any later increase or decrease resulting from a
change in values,  net assets or other  circumstances  will not be considered in
determining   whether  the  investment  complies  with  the  Trust's  investment
objectives and policies.

Additional Information Regarding GNMA Certificates.

     As prepayment  rates of individual  mortgage pools will vary widely,  it is
not possible to predict with certainty the average life of a particular issue of
GNMA Certificates. However, statistics published by the FHA are normally used as
an indicator of the expected average life of GNMA Certificates. These statistics
indicate that the average life of single-family  dwelling  mortgages with 25- to
30-year  maturities,  the type of  mortgages  backing the vast  majority of GNMA
Certificates,  is approximately  12 years.  For this reason,  it is customary to
treat GNMA Certificates as 30-year mortgage-backed securities which prepay fully
in the twelfth year. The actual life of a particular issue of GNMA Certificates,
however, will depend on the coupon rate of the underlying mortgages, with higher
interest rate mortgages being more prone to prepayment or refinancing.

     The coupon rate of interest of GNMA Certificates is lower than the interest
rate paid on the  VA-guaranteed  or  FHA-insured  mortgages  underlying the GNMA
Certificates,  but only by the  amount of the fees paid to GNMA and the  issuer.
For the most common type of mortgage  pool,  containing  single-family  dwelling
mortgages,  GNMA  receives  an  annual  fee of  6/100  of 1% of the  outstanding
principal for providing its  guarantee,  and the issuer is paid an annual fee of
44/100 of 1% for  assembling the mortgage pool and for passing  through  monthly
payments of interest and principal to GNMA Certificate holders.

     The coupon rate by itself,  however,  does not indicate the yield that will
be earned on GNMA Certificates for the reasons given in the section  "Investment
Objective  and  Policies"  in  the  Prospectus.   In  quoting  yields  for  GNMA
<PAGE>

Certificates,  the  customary  practice is to assume that the GNMA  Certificates
will have a  12-year  life.  Compared  on this  basis,  GNMA  Certificates  have
historically  yielded  roughly 25/100 of 1% more than high grade corporate bonds
and 50/100 of 1% more than U.S.  Government and U.S. Government agency bonds. As
the life of individual pools may vary widely,  however,  the actual yield earned
on any  issue of GNMA  Certificates  may  differ  significantly  from the  yield
estimated on the assumption of a 12-year life.

     Since the inception of the GNMA mortgage-backed securities program in 1970,
the amount of GNMA Certificates  outstanding has grown rapidly.  The size of the
market  and the  active  participation  in the  secondary  market by  securities
dealers and many types of investors  make the GNMA  Certificates a highly liquid
instrument.  Prices of GNMA  Certificates are readily  available from securities
dealers and depend on, among other things,  the level of market  interest rates,
the GNMA Certificate's coupon rate and the prepayment experience of the pools of
mortgages backing each GNMA Certificate.

Investment Restrictions

     The  Trust  has   adopted   certain   additional   fundamental   investment
restrictions  which may not be changed without the approval of a majority of the
Trust's  outstanding  voting  securities.  As used in the  Prospectus  and  this
Statement of Additional  Information,  such  approval  means the approval of the
lesser of (i) the holders of 67% or more of the shares  represented at a meeting
if the holders of more than 50% of the outstanding  shares are present in person
or by proxy, or (ii) the holders of more than 50% of the outstanding shares.

     The Trust may not:

     (1) invest its assets,  except in U.S. Government Securities (as defined in
the  Prospectus) and in when-issued  commitments and repurchase  agreements with
respect to these securities;

     (2) borrow  money,  except  from banks to meet  redemptions  in amounts not
exceeding  33 1/3%  (taken at the lower of cost or  current  value) of its total
assets  (including  the  amount  borrowed).  The Trust does not intend to borrow
money  during the coming  year,  and will do so only as a temporary  measure for
extraordinary purposes or to facilitate redemptions. The Trust will not purchase
securities while any borrowings are outstanding;

     (3) purchase securities on margin;
<PAGE>

     (4)  make  loans  to any  person,  except  by (a)  the  purchase  of a debt
obligation  in which  the  Trust is  permitted  to invest  and (b)  engaging  in
repurchase agreements;

     (5) act as an underwriter,  except as it may be deemed to be an underwriter
in a sale of restricted securities; or

     (6) issue senior securities, except as permitted by restrictions nos. 2 and
4 above,  and,  for  purposes  of this  restriction,  the  issuance of shares of
beneficial  interest  in  multiple  classes or series,  the  purchase or sale of
options,   futures   contracts  and  options  on  futures   contracts,   forward
commitments,  forward  foreign  exchange  contracts  and  repurchase  agreements
entered into in accordance with the Trust's investment policies.

     In order to  register  its shares in certain  jurisdictions,  the Trust has
agreed  to  adopt  certain  additional  investment  restrictions  which  are not
fundamental  and may be changed by a vote of the Trust's  Board of Trustees  and
without  shareholder  approval or  notification.  Pursuant  to these  additional
restrictions, the Trust may not:

     (a)      make short sales of securities;

     (b) write,  purchase  or  otherwise  invest in any put,  call,  straddle or
spread option;

     (c) invest in any security,  including any repurchase agreement maturing in
more than seven days,  which is illiquid,  if more than 15% of the net assets of
the Trust, taken at market value, would be invested in such securities;

     (d) pledge, mortgage or hypothecate its portfolio securities if at the time
of such action the value of the securities so pledged, mortgaged or hypothecated
would exceed 10% of the value of the Trust;

     (e) invest in warrants;

     (f)  invest  in  oil,  gas  or  other  mineral  leases  or  exploration  or
development programs; and

     (g)  purchase  or  sell  real  estate,   including   real  estate   limited
partnerships  except that the Fund may (i) acquire or lease office space for its
own use,  (ii)  invest in  securities  of issuers  that invest in real estate or
interests therein, (iii) invest in securities that are secured by real estate or
<PAGE>

interests therein,  (iv) purchase and sell  mortgage-related  securities and (v)
hold and sell real estate  acquired by the Fund as a result of the  ownership or
securities.

     In order to qualify as  permissible  investment  for Federal credit unions,
the Trust has agreed to adopt the following additional  investment  restrictions
which are not  fundamental  and may be changed by a vote of the Trust's Board of
Trustees and without shareholder approval or notification.

     (1) Except as provided in non-fundamental  restriction (2), with respect to
each security  purchased or sold by the Trust:  (1) the delivery of the security
will be made within  thirty (30) days from the trade date;  and (2) the price of
the security at the time of purchase will be the market price.

     (2) The  Trust  may  purchases  securities  on a  when-issued  or a delayed
delivery basis only in accordance with the following criteria:

          a. the securities  which are the subject of the when-issued or delayed
     delivery commitment will be marked-to-market daily;

          b. the delivery of the securities  subject to the  commitment  will be
     made within 120 days after the trade date;

          c.  the  price  of the  security  at the  time of  entering  into  the
     commitment will be the market price; and

          d. the Trust's custodian will maintain in a segregated account liquid,
     high grade debt securities having a value (determined daily) at least equal
     to the amount of the Trust's purchase commitment.

     (3) The Trust may engage in repurchase  agreements  which are comparable to
"investment-type"  repurchase  agreements  into which a Federal credit union may
enter.  In all  instances,  the purchase  price of  securities  obtained in such
repurchase  transactions  will  be  at  or  below  the  market  price  for  such
securities.  An  "investment-type"  repurchase  transaction  means a  repurchase
transaction  where the  Federal  credit  union  purchasing  the  security  takes
physical  possession of the security,  or receives  written  confirmation of the
purchase  and a  custodial  or  safekeeping  receipt  from a third party under a
written bailment for hire contract,  or is recorded as the owner of the security
through the Federal Reserve Book-Entry System.

     (4) The Trust may not purchase or sell a standby commitment.
<PAGE>

     (5) The Trust may not  purchase  or sell  futures  contracts  or options on
futures contracts.

     (6) The Trust may not engage in "adjusted  trading." Adjusted trading means
any  method  or  transaction  used to defer a loss  whereby  the  Trust  sells a
security to a counterparty  at a price above its  then-current  market price and
simultaneously  purchases or commits to purchase from the  counterparty  another
security at a price above its then-current price.

     (7) Except as provided in  non-fundamental  restriction (10), the Trust may
not purchase stripped mortgage-backed securities ("SMBS").

     (8) Except as provided in  non-fundamental  restriction (10), the Trust may
not purchase or hold a collateralized mortgage obligation ("CMO") or real estate
mortgage  investment  conduit  ("REMIC")  that meets any of the following  three
tests:

          a.  Average Life Test.  The CMO or REMIC has an expected  average life
     greater than 10 years;

          b.  Average  Life  Sensitivity  Test.  The average  life of the CMO or
     REMIC:  (a)  extends  by more  then 4  years,  assuming  an  immediate  and
     sustained  parallel  shift in the yield curve of plus 300 basis points;  or
     (b)  shortens by more than 6 years,  assuming an  immediate  and  sustained
     parallel shift in the yield curve of minus 300 basis points; or

          c. Price  Sensitivity  Test. The estimated  change in the price of the
     CMO or REMIC is more than 17 percent,  due to an  immediate  and  sustained
     parallel shift in the yield curve of plus or minus 300 basis points.

     The three tests contained in this non-fundamental  restriction apply at the
time of purchase and on any subsequent  retesting date, assuming market interest
rates and prepayment speeds at the time the tests are applied.

     (9) The  Trust  may  not  purchase  residual  interests  in a CMO or  REMIC
transaction.

     (10)  Non-fundamental  restrictions  (7)  and  (8) do not  apply  where  an
investment in SMBS,  CMOs or REMICs is made solely to reduce  interest rate risk
and where:

          a. A monitoring  and  reporting  system is in place that  provides the
     documentation  necessary to evaluate the expected and actual performance of
     the investment under different interest rate scenarios;

<PAGE>

          b. The monitoring and reporting system is used to conduct and document
     an analysis  that shows,  prior to purchase,  that the proposed  investment
     will reduce the Trust's interest rate risk; and

          c. The  investment,  subsequent  to  purchase,  is  evaluated at least
     quarterly,  to determine whether or not the investment has actually reduced
     the Trust's interest rate risk.

     (11) The average  life and average  life  sensitivity  tests  contained  in
non-fundamental  restriction (8) do not apply to a floating or adjustable rate a
CMO or REMIC  instrument  that has all of the following  characteristics  at the
time of purchase or on a subsequent testing date, irrespective of whether or not
the security has been purchased to reduce interest-rate risk:

               a. The interest  rate of the  instrument is reset or may reset at
          least annually;

               b. The interest rate of the  instrument,  at the time of purchase
          or at a subsequent  testing date, is below any  contractual cap of the
          instrument;

               c.  The  index  upon  which  the  interest  rate  is  based  is a
          conventional widely-used market interest rate; and

               d. The  interest  rate of the  instrument  varies  directly  (not
          inversely)  with the index  upon  which it is based and not reset as a
          multiple of the change in the related index.

     (12) The Trust  may not may not  purchase  a zero  coupon  security  with a
maturity date that is more than 10 years from the  settlement  date for purchase
of the security.


2.   MANAGEMENT OF THE TRUST

     The Trust's Board of Trustees  provides broad  supervision over the affairs
of the  Trust.  The  officers  of the  Trust  are  responsible  for the  Trust's
operations.  The Trustees and executive  officers of the Trust are listed below,
together  with  their  principal  occupations  during  the past five  years.  An
asterisk indicates those Trustees who are interested persons of the Trust within
the meaning of the Investment Company Act of 1940 (the "1940 Act").
<PAGE>

JOHN F. COGAN, JR.*,                   Chairman of the Board, President and
Chairman of the Board,                 Trustee of all Pioneer mutual funds;
President and Trustee                  President and Director of The Pioneer
                                       Group, Inc. ("PGI"); Chairman and
                                       Director of Pioneering Management
                                       Corporation ("PMC"); Chairman of the
                                       Board and Chief Executive Officer of
                                       Pioneer Winthrop Advisers ("PWA") since
                                       1993; Chairman of the Board of Pioneer
                                       Funds Distributor, Inc. ("PFD"); Director
                                       of Pioneering Services Corporation
                                       ("PSC") and Pioneer Capital Corporation
                                       ("PCC"); President and Director of
                                       Pioneer Plans Corporation ("PPC"),
                                       Pioneer Investment Corp. ("PIC"), Pioneer
                                       International Corp. ("PIntl"), and
                                       Pioneer Metals & Technology, Inc.
                                       ("PMT"); Chairman of the Board and
                                       Director of Teberebie Goldfields Limited;
                                       Chairman, President and Director of
                                       Pioneer Goldfields Limited ("PGL");
                                       Chairman of the Supervisory Board of
                                       Pioneer Funds Marketing GmbH; and
                                       Chairman and Partner, Hale and Dorr
                                       (counsel to the Trust).

RICHARD H. EGDAHL, M.D.,               Trustee of all Pioneer mutual funds
Trustee                                since 1992; Professor of Management,
  53 Bay State Road                    Boston University School of
  Boston, Massachusetts                Management; Professor of Public Health,
                                       Boston University School of Public
                                       Health; Professor of Surgery, Boston
                                       University School of Medicine and Boston
                                       University Health Policy Institute;
                                       Director, Boston University Medical
                                       Center; Executive Vice President and Vice
                                       Chairman of the Board, University
                                       Hospital; Academic Vice President for
                                       Health Affairs, Boston University;
                                       Director, Essex Investment Management
                                       Company, Inc. (investment adviser),
                                       Health Payment Review, Inc. (health care
                                       containment software firm), Mediplex
                                       Group, Inc. (nursing care facilities
                                       firm), Peer Review Analysis, Inc. (health
<PAGE>

                                       care utilization management firm) and
                                       Springer-Verlag New York, Inc.
                                       (publisher); Honorary Director,
                                       Franciscan Children's Hospital. Boston
                                       University Health Policy Institute.

MARGARET B.W. GRAHAM,                  Trustee of all Pioneer mutual funds;
Trustee                                Manager of Research Operations,
  The Keep                             Xerox Palo Alto Research Center,
  Post Office Box 110                  since September 1991; Professor of
  Little Deer Island, Maine            Operations Management and Management
                                       of Technology, Boston University School
                                       of Management ("BUSM"), since 1989;
                                       Associate Dean, BUSM, 1988 to 1990 and
                                       previously, Associate Professor,
                                       Department of Operations Management,
                                       BUSM.

JOHN W. KENDRICK,                      Trustee of all Pioneer mutual funds;
Trustee                                Professor Emeritus, George
  6363 Waterway Drive                  Washington University; Economic
  Falls Church, Virginia               Consultant and Director, American
                                       Productivity and Quality Center.

MARGUERITE A. PIRET,                   Trustee of all Pioneer mutual funds;
Trustee                                President, Newbury, Piret & Company,
  One Boston Place,                    Inc. (a merchant banking firm).
  Suite 2635
  Boston, Massachusetts.

DAVID D. TRIPPLE*,                     Trustee and Executive Vice President
Trustee and Executive                  of all Pioneer mutual funds;
Vice President                         Executive Vice President and
                                       Director of PGI and PWA (since 1993);
                                       Director of PFD, since 1989; Director of
                                       PCC and Pioneer SBIC Corporation;
                                       President (since 1993), Chief Investment
                                       Officer and a Director of PMC.

STEPHEN K. WEST                        Trustee of all Pioneer mutual funds
Trustee                                since 1993; Partner, Sullivan &
  125 Broad Street                     Cromwell (a law firm).
  New York, New York
<PAGE>

JOHN WINTHROP,                         Trustee of all Pioneer mutual funds;
Trustee                                President, John Winthrop & Co.,
  One North Adgers Wharf               Inc. (a private investment firm);
  Charleston,  South  Carolina         Director of NUI Corp., and Trustee of
                                       Alliance Capital Reserves, Alliance
                                       Government Reserves and Alliance Tax
                                       Exempt Reserves.

SHERMAN B. RUSS,                       Vice President of PMC and certain
Vice President                         Pioneer mutual funds.

WILLIAM H. KEOUGH,                     Senior Vice President, Chief
Treasurer                              Financial Officer and Treasurer of PGI
                                       and Treasurer of PFD, PMC, all Pioneer
                                       mutual funds, PSC, PCC, PPC, PIC, PIntl,
                                       PMT, PWA and Pioneer SBIC Corporation.

JOSEPH P. BARRI,                       Secretary of PGI, PMC, all Pioneer
Secretary                              mutual funds, PCC, PPC, PIC, PIntl, PMT
                                       and PWA; Clerk of PFD and PSC and
                                       Partner, Hale and Dorr (counsel to the
                                       Trust).

   
ROBERT P. NAULT,                       General Counsel of PGI since 1995;
Assistant  Secretary                   formerly of Hale and Dorr (counsel to the
                                       Fund) where he most recently served as a
                                       junior partner.
    

ERIC W. RECKARD,                       Assistant treasurer of each of the
Assistant Treasurer                    Pioneer mutual funds since 1994; Manager
                                       of Fund Accounting for PMC and Assistant
                                       to Chief Financial Officer of PGI since
                                       1994; held various positions at PGI prior
                                       to 1994.


       The Trust's  Declaration of Trust provides that the holders of two-thirds
of its  outstanding  shares  may vote to  remove a  Trustee  of the Trust at any
special  meeting of  shareholders.  The  business  address of all officers is 60
State Street, Boston, Massachusetts 02109.

   
       All of the  outstanding  capital  stock of PMC and PSC is owned by PGI, a
Delaware corporation.  All of the outstanding capital stock of PFD is indirectly
owned by PGI.
    
<PAGE>

   
     The table below lists all the Pioneer mutual funds currently offered to the
public and the investment adviser and principal underwriter for each fund.
    

                                             Investment        Principal
Fund Name                                      Adviser        Underwriter

Pioneer Fund                                    PMC               PFD
Pioneer II                                      PMC               PFD
Pioneer Three                                   PMC               PFD
Pioneer Growth Shares                           PMC               PFD
Pioneer Capital Growth Fund                     PMC               PFD
Pioneer Equity-Income Fund                      PMC               PFD
Pioneer Gold Shares                             PMC               PFD
   
Pioneer Winthrop Real Estate                    Note 1            PFD
  Investment Fund
    
Pioneer Europe Fund                             PMC               PFD
Pioneer International Growth Fund               PMC               PFD
Pioneer India Fund                              PMC               PFD
   
Pioneer Emerging Markets Fund                   PMC               PFD
    
Pioneer Bond Fund                               PMC               PFD
Pioneer America Income Trust                    PMC               PFD
   
Pioneer Short-Term Income Fund                  PMC               PFD
    
Pioneer Income Fund                             PMC               PFD
Pioneer Tax-Free Income Fund                    PMC               PFD
Pioneer Intermediate Tax-Free Fund              PMC               PFD
Pioneer California Double Tax-Free Fund         PMC               PFD
Pioneer New York Triple Tax-Free Fund           PMC               PFD
   
Pioneer Massachusetts Double                    PMC               PFD
  Tax-Free Fund
Pioneer Cash Reserves Fund                      PMC               PFD
Pioneer U.S. Government Money Fund              PMC               PFD
Pioneer Tax-Free Money Fund                     PMC               PFD
Pioneer Interest Shares, Inc.                   PMC               Note 2
Pioneer Variable Contracts Trust                PMC               Note 3
    


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

     Note 1 Pioneer Winthrop Advisers is the investment adviser for this fund.

     Note 2 This is a closed-end fund.

     Note 3 This is a series of seven separate portfolios designed to provide
            investment vehicles for the variable annuity and variable life
            insurance contracts of various insurance companies or for certain
            qualified pension plans.


<PAGE>

     PMC,  the Trust's  investment  adviser,  also  manages the  investments  of
certain institutional private accounts.

     To the knowledge of the Trust,  no officer or Trustee of the Trust owned 5%
or more of the  issued  and  outstanding  shares  of PGI as of the  date of this
Statement  of   Additional   Information,   except  Mr.  Cogan  who  then  owned
approximately 15% of such shares.

     The Trust pays no  salaries or  compensation  to any of its  officers.  The
Trust  pays an  annual  trustees'  fee of $100,  and a payment  of  $1,000  plus
expenses per meeting  attended,  to each Trustee who is not affiliated with PMC,
PFD or PSC and  pays an  annual  trustees'  fee of $500  plus  expenses  to each
Trustee affiliated with PMC, PFD or PSC. 

<TABLE>
<CAPTION>
   
                                                                                       Total Compensa-
                                                                                        tion from the
                                                               Pension or              Trust and other
                                        Aggregate              Retirement               funds in the
                                      Compensation              Benefits               Pioneer Family
Director                             From the Trust              Accrued              of Mutual Funds**

<S>                                      <C>                        <C>                   <C>     
John F. Cogan, Jr.                       $ 500*                     $0                    $11,750*
Richard H. Egdahl, M.D.                  3,100                       0                     55,650
Margaret B.W. Graham                     3,100                       0                     55,650
John W. Kendrick                         3,100                       0                     55,650
Marguerite A. Piret                      4,100                       0                     66,650
David D. Tripple                           500*                      0                      9,000*
Stephen K. West                          3,700                       0                     63,650
John Winthrop                            3,700                       0                     63,650
                                         -----                     ---                    -------

  Totals                               $21,700                      $0                   $381,650
                                        ======                                            =======
<FN>
- --------

*    PMC fully reimbursed the Trust and the other funds in the Pioneer Family of
     Mutual Funds for compensation paid to Messrs. Cogan and Tripple.

**   For the calendar year ended December 31, 1994.
</FN>
</TABLE>

       Any such fees and expenses paid to  affiliates  or interested  persons of
PMC, PFD or PSC are reimbursed to the Trust under its Management Contract. As of
the date of this Statement of Additional Information,  the Trustees and officers
of the Trust owned beneficially in the aggregate less than 1% of the outstanding
shares of the Trust. As of such date, no person beneficially owned 5% or more of
the outstanding shares of the Trust.
    
<PAGE>


3.  INVESTMENT ADVISER

     The Trust has contracted with PMC, 60 State Street, Boston,  Massachusetts,
to act as its investment  adviser.  The term of the contract is one year, but it
is renewable  annually after such date by the vote of a majority of the Board of
Trustees of the Trust (including a majority of the Board of Trustees who are not
parties to the contract or  interested  persons of any such  parties).  The vote
must be cast in person at a meeting  called  for the  purpose  of voting on such
renewal.  This contract  terminates  if assigned and may be  terminated  without
penalty  by either  party by vote of its Board of  Directors  or  Trustees  or a
majority  of its  outstanding  voting  securities  and the giving of sixty days'
written notice. The management  contract was approved by the shareholders of the
Trust at a meeting of shareholders held on December 6, 1993. As compensation for
its management  services and expenses incurred,  PMC is entitled to a management
fee at the rate of 0.60% per annum of the Trust's average daily net assets.  The
fee is normally computed and accrued daily and paid monthly.

     On an interim basis, PMC has voluntarily  agreed not to impose a portion of
its  management  fee and to make  other  arrangements,  if  necessary,  to limit
certain  other  expenses  of the Trust to the extent  required  to reduce  total
expenses to 1.00% of the average  daily net assets  attributable  to the Class A
shares.  The  management  fee  attributable  to the Class B shares  will only be
imposed  to the  extent  it is  imposed  for the Class A  shares.  See  "Expense
Information" and "Management of the Trust" in the Prospectus. PMC's agreement to
reduce the  management  fee is  voluntary  and  temporary  and may be revised or
terminated by PMC at any time.

   
     Pursuant to the expense limitation discussed above, during the fiscal years
ended December 31, 1994, 1993 and 1992, the Trust's management fees were reduced
by $155,511, $133,160 and $151,423, respectively, resulting in actual management
fees paid  during  these  periods to PMC of  $692,136,  $587,361  and  $264,136,
respectively. See the Notes to the Financial Statements in the December 31, 1994
Annual Report (incorporated herein by reference) for more information.
    

   
     In an attempt to avoid any potential  conflict with portfolio  transactions
for the Fund, the Adviser and the Fund have adopted  extensive  restrictions  on
personal  securities  trading by  personnel  of the Adviser and its  affiliates.
These   restrictions   include:   pre-clearance   of  all  personal   securities
transactions  and a  prohibition  of  purchasing  initial  public  offerings  of
securities.  These  restrictions  are a continuation of the basic principle that
the interests of the Fund and its shareholders  come before those of the Adviser
and its employees.
<PAGE>
    

4.   PRINCIPAL UNDERWRITER

   
     PFD,  60 State  Street,  Boston,  Massachusetts,  serves  as the  principal
underwriter  for the Trust in  connection  with the  continuous  offering of the
shares of the Trust pursuant to an  Underwriting  Agreement dated July 10, 1990.
The  Trustees  who are not,  and were not at the  time  they  voted,  interested
persons of the Trust,  as defined  in the 1940 Act,  approved  the  Underwriting
Agreement.  The  Underwriting  Agreement  will  continue  from  year  to year if
annually  approved by the  Trustees.  During the  Trust's  fiscal  years  ending
December 31, 1994, 1993 and 1992, net underwriting  commissions  retained by PFD
in  connection  with the  offering of Trust shares were  approximately  $76,256,
$58,571 and $97,090,  respectively.  Commissions  reallowed to dealers by PFD in
those periods were approximately $543,725, $504,896 and $845,975, respectively.
    

     PFD  bears  all  expenses  it  incurs  in  providing   services  under  the
Underwriting Agreement.  Such expenses include compensation to its employees and
representatives and to securities dealers for distribution related services. PFD
also pays certain  expenses in connection  with the  distribution of the Trust's
shares,  including the cost of preparing,  printing and distributing advertising
or promotional materials, and the cost of printing and distributing prospectuses
and  supplements  to  prospective  shareholders.  The  Trust  bears  the cost of
registering its shares under federal and state securities law. The Trust and PFD
have agreed to  indemnify  each other  against  certain  liabilities,  including
liabilities under the Securities Act of 1933, as amended. Under the Underwriting
Agreement, PFD will use its best efforts in rendering services to the Trust.

     The Trust will not  generally  issue Trust shares for  consideration  other
than cash. At the Trust's sole  discretion,  however,  it may issue Trust shares
for consideration other than cash in connection with a bona fide reorganization,
statutory  merger or other  acquisition  of  portfolio  securities  (other  than
municipal  debt  securities  issued  by state  political  subdivisions  or their
agencies or  instrumentalities)  provided (i) the securities meet the investment
objectives  and policies of the Trust;  (ii) the  securities are acquired by the
Trust for investment and not for resale;  (ii) the securities are not restricted
as to transfer  either by law or  liquidity of market;  and (iv) the  securities
have a value  which  is  readily  ascertainable  (and  not  established  only by
evaluation  procedures) as evidenced by a listing on the American Stock exchange
or the New York Stock Exchange or by quotation under the NASDAQ National Market.
<PAGE>

   
An  exchange  of  securities  for  Trust  shares  will  generally  be a  taxable
transaction to the shareholder.
    

5.   DISTRIBUTION PLANS

     The  Trust  has  adopted  a plan of  distribution  pursuant  to Rule  12b-1
promulgated  by the SEC under the 1940 Act with  respect to Class A shares  (the
"Class A Plan") and a plan of  distribution  with respect to Class B shares (the
"Class B Plan") (together, the "Plans").

Class A Plan

     Pursuant  to the  Class  A  Plan  the  Trust  may  reimburse  PFD  for  its
expenditures in financing any activity  primarily intended to result in the sale
of the Class A Plan shares.  Certain  categories of such  expenditures have been
approved  by the  Board of  Trustees  and are set forth in the  Prospectus.  See
"Distribution  Plans" in the  Prospectus.  The expenses of the Trust pursuant to
the Class A Plan are  accrued  daily at a rate  which may not  exceed the annual
rate of 0.25% of the Trust's  average daily net assets  attributable  to Class A
shares.  The Class A Plan became effective on October 15, 1990. The Class A Plan
does not provide for the carryover of reimbursable expenses beyond twelve months
from the time they are incurred.

Class B Plan

     The Class B Plan  provides  that the Trust  shall pay PFD,  as the  Trust's
distributor for its Class B shares, a daily  distribution fee equal on an annual
basis to 0.75% of the Trust's  average daily net assets  attributable to Class B
shares  and will pay PFD a  service  fee equal to 0.25% of the  Trust's  average
daily net assets  attributable  to Class B shares (which PFD will in turn pay to
securities  dealers which enter into a sales  agreement with PFD at a rate of up
to 0.25% of the Trust's average daily net assets  attributable to Class B shares
owned by investors  for whom that  securities  dealer is the holder or dealer of
record).  This service fee is intended to be consideration for personal services
and/or account maintenance services rendered by the dealer with respect to Class
B shares. PFD will advance to dealers the first-year service fee at a rate equal
to 0.25% of the amount invested.  As compensation  therefor,  PFD may retain the
service  fee paid by the Trust with  respect  to such  shares for the first year
after purchase.  Dealers will become  eligible for additional  service fees with
respect to such shares  commencing in the thirteenth  month following  purchase.
Dealers  may from time to time be  required to meet  certain  other  criteria in
order to receive  service fees. PFD or its affiliates are entitled to retain all
<PAGE>

service  fees  payable  under the  Class B Plan for which  there is no dealer of
record  or for  which  qualification  standards  have not  been  met as  partial
consideration  for  personal  services  and/or  account   maintenance   services
performed by PFD or its affiliates for shareholder accounts.

     The  purpose of  distribution  payments to PFD under the Class B Plan is to
compensate PFD for its distribution  services to the Trust. PFD pays commissions
to dealers as well as  expenses of printing  prospectuses  and reports  used for
sales  purposes,  expenses with respect to the preparation and printing of sales
literature  and  other  distribution   related  expenses,   including,   without
limitation,  the cost  necessary  to provide  distribution-related  services  or
personnel, travel, office expenses and equipment. The Class B Plan also provides
that  PFD  will  receive  all  CDSCs  attributable  to  Class  B  shares.   (See
"Distribution Plans" in the Prospectus.)

General

     In  accordance  with the terms of the Plans,  PFD provides to the Trust for
review by the Trustees a quarterly  written report of the amounts expended under
the respective  Plan and the purpose for which such  expenditures  were made. In
the Trustees'  quarterly  review of the Plans,  they will consider the continued
appropriateness  and the  level  of  reimbursement  or  compensation  the  Plans
provide.

     No interested  person of the Trust, nor any Trustee of the Trust who is not
an interested person of the Trust, has any direct or indirect financial interest
in the  operation  of the Plans except to the extent that PFD and certain of its
employees  may be deemed to have such an  interest  as a result of  receiving  a
portion of the amounts  expended  under the Plans by the Trust and except to the
extent certain officers may have an interest in PFD's ultimate parent, PGI.

     The  Plans  were  adopted  by a  majority  vote of the  Board of  Trustees,
including  all of the Trustees who are not, and were not at the time they voted,
interested persons of the Trust, as defined in the 1940 Act (none of whom has or
have any direct or indirect  financial  interest in the  operation of the Plans)
(the "Qualified  Trustees"),  cast in person at a meeting called for the purpose
of voting on the Plans.  In approving  the Plans,  the Trustees  identified  and
considered a number of potential benefits which the Plans may provide. The Board
of Trustees  believes that there is a reasonable  likelihood that the Plans will
benefit the Trust and its current and future  shareholders.  Under their  terms,
the Plans  remain  in effect  from year to year  provided  such  continuance  is
approved  annually by vote of the Trustees in the manner  described  above.  The
Plans may not be amended to increase materially the annual percentage limitation
<PAGE>

of average  net assets  which may be spent for the  services  described  therein
without approval of the shareholders of the Trust affected thereby, and material
amendments  of the Plans must also be  approved  by the  Trustees  in the manner
described  above. A Plan may be terminated at any time,  without  payment of any
penalty,  by vote of the majority of the Trustees who are not interested persons
of the Trust and have no direct or indirect financial interest in the operations
of the Plan, or by a vote of a majority of the outstanding  voting securities of
the  respective  Class of the Trust (as  defined in the 1940  Act).  A Plan will
automatically  terminate in the event of its  assignment (as defined in the 1940
Act). In the  Trustees'  quarterly  review of the Plans,  they will consider the
Plans' continued appropriateness and the level of compensation they provide.

   
     During  the  fiscal  year  ended  December  31,  1994,  the Trust  incurred
distribution  fees of $344,155  pursuant to the Class A Plan and $7,649 pursuant
to the  Class B Plan.  The  distribution  fees  were paid by the Trust to PFD in
reimbursement  of expenses  related to servicing of shareholder  accounts and to
compensating dealers' sales personnel.
    

6.   SHAREHOLDER SERVICING/TRANSFER AGENT

     The Trust has contracted with PSC, 60 State Street, Boston,  Massachusetts,
to act as shareholder  servicing and transfer agent for the Trust. This contract
terminates if assigned and may be terminated  without penalty by either party by
vote of its Board of  Directors  or Trustees  or a majority  of its  outstanding
voting securities and the giving of ninety days' written notice.

     Under the terms of its contract  with the Trust,  PSC services  shareholder
accounts,  and  its  duties  include:  (i)  processing  sales,  redemptions  and
exchanges of shares of the Trust; (ii) distributing  dividends and capital gains
associated with Trust portfolio accounts;  and (iii) maintaining account records
and responding to shareholder inquiries.

   
     PSC  receives  an annual fee of $28.00 per Class A and Class B  shareholder
account from the Trust as compensation for the services  described  above.  This
fee is set at an  amount  determined  by  vote  of a  majority  of the  Trustees
(including a majority of the  Trustees who are not parties to the contract  with
PSC or interested persons of any such parties) to be comparable to fees for such
services being paid by other investment companies.
    
<PAGE>

7.   CUSTODIAN

     Brown  Brothers  Harriman & Co. (the  "Custodian")  is the custodian of the
Trust's  assets.  The  Custodian's   responsibilities  include  safekeeping  and
controlling the Trust's cash and  securities,  handling the receipt and delivery
of securities and collecting interest and dividends on the Trust's  investments.
The Custodian does not determine the investment  policies of the Trust or decide
which securities the Trust will buy or sell. The Trust may,  however,  invest in
securities,  including  repurchase  agreements,  issued by the Custodian and may
deal with the  Custodian  as  principal in  securities  transactions.  Portfolio
securities may be deposited into the Federal  Reserve-Treasury  Department  Book
Entry System or the Depository Trust Company.

8.   INDEPENDENT PUBLIC ACCOUNTANTS

   
     Arthur  Andersen  LLP  are  the  Trust's  independent  public  accountants,
providing audit  services,  tax return review,  and assistance and  consultation
with respect to the preparation of filings with the SEC.
    

9.   PORTFOLIO TRANSACTIONS

     The Trust  intends to fully  manage  its  portfolio  by buying and  selling
securities,  as  well  as  holding  securities  to  maturity.  In  managing  its
portfolio,  the Trust seeks to take advantage of market  developments  and yield
disparities, which may include use of the following strategies:

          (1) shortening the average  maturity of its portfolio in  anticipation
     of a rise in interest rates so as to minimize depreciation of principal;

          (2) lengthening the average  maturity of its portfolio in anticipation
     of a decline in interest rates so as to maximize yield;

          (3)  selling  one  type of  debt  security  and  buying  another  when
     disparities arise in the relative values of each; and

          (4) changing  from one debt  security to an  essentially  similar debt
     security  when  their  respective  yields  appear  distorted  due to market
     factors.

     The Trust engages in portfolio  trading if it believes a transaction net of
costs (including taxes and custodian charges) will help in achieving the Trust's
investment objective.
<PAGE>

     Decisions  relating to the purchase and sale of  securities  for the Trust,
the allocation of portfolio transactions and, where applicable,  the negotiation
of commission rates are made by officers of PMC.

     The primary  consideration in placing  portfolio  security  transactions is
execution  at the most  favorable  prices.  PMC has  complete  freedom as to the
markets  in  and  broker-dealers  through  which  it  seeks  this  result.  Debt
securities are traded principally in the over-the-counter  market on a net basis
through  dealers  acting for their own account  and not as brokers.  The cost of
securities purchased from underwriters  includes an underwriter's  commission or
concession,  and the prices at which  securities are purchased and sold from and
to dealers include a dealer's markup or markdown. PMC attempts to negotiate with
underwriters  to decrease the  commission or  concession  for the benefit of the
Trust.  PMC  normally  seeks to deal  directly  with the primary  market  makers
unless, in its opinion, better prices are available elsewhere.

     Subject to the  requirement  of  seeking  execution  at the best  available
price,  securities may, as authorized by PMC's  management  contract,  be bought
from or sold to dealers who furnish  statistical  research and other information
or services to PMC and the Trust, or who sell shares of the Trust. Brokerage and
research  services may include advice  concerning  the value of securities;  the
advisability of investing in, purchasing or selling securities; the availability
of  securities  or the  purchasers  or sellers  of  securities;  and  furnishing
analyses, manuals and reports concerning issuers,  securities,  economic factors
and trends,  portfolio  strategy,  performance  of  accounts,  comparative  fund
statistics  and credit rating  service  information.  PMC maintains a listing of
dealers who provide such services on a regular basis.  Management  believes that
no exact dollar value can be calculated for such services.

     The Trustees  periodically review PMC's performance of its responsibilities
in  connection  with the  placement of portfolio  transactions  on behalf of the
Trust.

10.  TAX STATUS

     It is the Trust's  policy to meet the  requirements  of Subchapter M of the
Internal Revenue Code of 1986, as amended (the "Code"),  for  qualification as a
regulated  investment  company.  These requirements relate to the sources of its
income,  diversification  of  its  assets  and  distribution  of its  income  to
shareholders.  If the Trust meets all such  requirements  and distributes to its
shareholders  at least  annually all investment  company  taxable income and net
capital  gain,  if any,  which it  receives,  the Trust will be  relieved of the
necessity of paying federal income tax.
<PAGE>

     Because the Trust's income is not expected to arise from dividends, no part
of  its  distributions  to its  corporate  shareholders  will  qualify  for  the
dividends-received deduction for corporations.

     Any dividend declared by the Trust in October, November or December as of a
record  date in such a month  and paid  during  the  following  January  will be
treated for federal income tax purposes as received by  shareholders on December
31 of the calendar year in which it is declared.

     Since, at the time of an investor's  purchase of Trust shares, a portion of
the per share net asset value by which the purchase  price is determined  may be
represented by realized or unrealized  appreciation in the Trust's  portfolio or
undistributed taxable income of the Trust, subsequent distributions (or portions
thereof)  on such shares may be taxable to such  investor  even if the net asset
value of his shares is, as a result of the distributions, reduced below his cost
for such shares and the distributions (or portions thereof) in reality represent
a return of a portion of his investment.

     Any loss realized by a shareholder upon the redemption of shares with a tax
holding  period at the time of  redemption of six months or less will be treated
as  a  long-term   capital  loss  to  the  extent  of  any  amounts  treated  as
distributions of long-term capital gain with respect to such shares.

     In addition,  if Class A shares  redeemed or  exchanged  have been held for
less  than  91  days,  (1)  in  the  case  of a  reinvestment  pursuant  to  the
reinvestment privilege,  the sales charge paid on such shares is not included in
their tax basis  under the Code,  and (2) in the case of an  exchange,  all or a
portion of the sales  charge  paid on such  shares in not  included in their tax
basis under the Code, to the extent a sales charge that would otherwise apply to
the shares  received is reduced  pursuant to the exchange  privilege.  In either
case, the portion of the sales charge not included in the tax basis of the share
redeemed  or  surrendered  in an  exchange  is  included in the tax basis of the
shares acquired in the reinvestment or exchange.  Losses on ceratin  redemptions
may be disallowed  under "wash sale" rules in the event of other  investments in
the Trust within 30 days before or after a redemption or other sale of shares.

     For federal income tax purposes,  the Trust is permitted to carry forward a
net realized  capital loss in any year to offset realized capital gains, if any,
during the eight years following the year of the loss. To the extent  subsequent
<PAGE>

net realized  capital gains are offset by such losses,  they would not result in
federal income tax liability to the Trust and are not expected to be distributed
as such to shareholders.

     Different   tax   treatment,   including   penalties   on  certain   excess
contributions  and  deferrals,   certain   pre-retirement  and   post-retirement
distributions,  and  certain  prohibited  transactions,  is accorded to accounts
maintained as qualified retirement plans.
Shareholders should consult their tax advisers for more information.

     The Trust is not subject to  Massachusetts  corporate  excise or  franchise
taxes and,  provided that it qualifies as a regulated  investment  company under
the Code, will not be required to pay any Massachusetts income tax.

     Federal law requires that the Trust withhold (as "backup  withholding") 31%
of  reportable  payments,  including  dividends,  capital  gain  dividends,  and
proceeds of redemptions  (including  exchanges) and  repurchases to shareholders
who have not complied with IRS  regulations.  In order to avoid this withholding
requirement, shareholders must certify on their Applications, or on separate W-9
Forms,  that their Social  Security or other Taxpayer  Identification  Number is
correct and that they are not currently subject to backup  withholding,  or that
they are exempt from backup withholding.  The Trust may nevertheless be required
to  withhold  if it  receives  notice  from the IRS or a broker  that the number
provided  is  incorrect  or  backup  withholding  is  applicable  as a result of
previous underreporting of interest or dividend income.

     It is possible that some states will exempt from income tax that portion of
a dividend of the Trust that represents interest received by the Trust from U.S.
Government  securities.  Therefore,  the  Trust  will  report  annually  to  its
shareholders  the percentage of interest  income  received from U.S.  Government
securities during the preceding year indicating the source of such income.  Each
shareholder  is advised to consult his own tax adviser  regarding the exemption,
if any, of such interest income under applicable law.

     The description  above relates only to U.S. federal income tax consequences
for shareholders who are U.S. persons, i.e., U.S. citizens or residents, or U.S.
corporations,  partnerships,  trusts or  estates,  and who are  subject  to U.S.
federal  income  tax.  The  description  does not  address the special tax rules
applicable to certain classes of investors,  such as banks,  insurance companies
or  tax-exempt  entities.  Investors  other than U.S.  persons may be subject to
different U.S. tax treatment,  including a possible 30% U.S. withholding tax (or
<PAGE>

withholding tax at a lower treaty rate) on dividends treated as ordinary income.
Shareholders  should  consult  their own tax  advisers  on these  matters and on
state, local and other applicable tax laws.

11.  DESCRIPTION OF SHARES

     The Trust's Declaration of Trust permits the Board of Trustees to authorize
the issuance of an unlimited number of full and fractional  shares of beneficial
interest  (without par value) which may be divided into such separate  series as
the Trustees may  establish.  Currently,  the Trust consists of only one series.
The Trustees may, however,  establish additional series of shares in the future,
and may divide or combine the shares  into a greater or lesser  number of shares
without thereby changing the  proportionate  beneficial  interests in the Trust.
The  Declaration  of Trust  further  authorizes  the  Trustees  to  classify  or
reclassify any series of the shares into one or more classes.  Pursuant thereto,
the Trustees have authorized the issuance of two classes of shares of the Trust,
Class A shares and Class B shares. Each share of a class of the Trust represents
an equal  proportionate  interest in the assets of the Trust  allocable  to that
class.  Upon  liquidation of the Trust,  shareholders of each class of the Trust
are entitled to share pro rata in the Trust's net assets allocable to such class
available for  distribution  to  shareholders.  The Trust  reserves the right to
create and issue  additional  series or  classes  of  shares,  in which case the
shares of each class of a series  would  participate  equally  in the  earnings,
dividends and assets allocable to that class of the particular series.  Prior to
July 1, 1994, the Trust was named Pioneer U.S. Government Trust.

     Shareholders  are  entitled to one vote for each share held and may vote in
the  election  of  Trustees  and on  other  matters  submitted  to  meetings  of
shareholders.  Although  Trustees are not elected annually by the  shareholders,
shareholders have, under certain circumstances,  the right to remove one or more
Trustees.  No amendment  adversely  affecting the rights of shareholders  may be
made to the  Trust's  Declaration  of Trust  without the  affirmative  vote of a
majority of its shares.  Shares have no preemptive or conversion rights.  Shares
are fully paid and  non-assessable  by the Trust,  except as stated  below.  See
"Certain Liabilities."

12.  CERTAIN LIABILITIES

   
     As a Massachusetts  business trust, the Trust's  operations are governed by
its Amended and Restated  Declaration of Trust dated December 7, 1993, a copy of
which  is on file  with the  office  of the  Secretary  of The  Commonwealth  of
Massachusetts.  Theoretically,  shareholders of a  Massachusetts  business trust
may, under certain circumstances,  be held personally liable for the obligations
of the trust.  However,  the Declaration of Trust contains an express disclaimer
<PAGE>
of  shareholder  liability for acts or obligations of the Trust or any series of
the Trust and  provides  that  notice  of such  disclaimer  may be given in each
agreement, obligation or instrument entered into or executed by the Trust or its
Trustees.  Moreover,  the Declaration of Trust provides for the  indemnification
out of  Trust  property  of any  shareholders  held  personally  liable  for any
obligations  of the Trust or any series of the Trust.  The  Declaration of Trust
also  provides  that the Trust shall,  upon  request,  assume the defense of any
claim made against any  shareholder  for any act or  obligation of the Trust and
satisfy  any  judgment  thereon.  Thus,  the  risk  of a  shareholder  incurring
financial  loss beyond his or her investment  because of  shareholder  liability
would be limited to  circumstances  in which the Trust  itself will be unable to
meet its  obligations.  In light of the nature of the Trust's  business  and the
nature and amount of its assets,  the  possibility  of the  Trust's  liabilities
exceeding its assets, and therefore a shareholder's risk of personal  liability,
is remote.
    

     The  Declaration of Trust further  provides that the Trust shall  indemnify
each of its Trustees and officers  against  liabilities and expenses  reasonably
incurred by them,  in connection  with,  or arising out of, any action,  suit or
proceeding,  threatened against or otherwise  involving such Trustee or officer,
directly or  indirectly,  by reason of being or having been a Trustee or officer
of the Trust. The Declaration of Trust does not authorize the Trust to indemnify
any Trustee or officer  against any liability to which he or she would otherwise
be subject by reason of or for willful misfeasance,  bad faith, gross negligence
or reckless disregard of such person's duties.

13.  LETTER OF INTENTION

     Purchases   of  $100,000  or  more  of  Class  A  shares   (excluding   any
reinvestments  of  dividends  and  capital  gains  distributions)  made within a
13-month period  pursuant to a Letter of Intention  provided by PFD will qualify
for a reduced  sales  charge.  Such reduced sales charge will be the charge that
would be applicable to the purchase of all Class A shares  purchased during such
13-month period pursuant to a Letter of Intention had such shares been purchased
all at once.  See "How to Buy Trust Shares" in the  Prospectus.  For example,  a
person who signs a Letter of Intention providing for a total investment in Trust
Class A shares of $100,000  over a 13-month  period would be charged at the 3.5%
sales charge rate with respect to all purchases  during that period.  Should the
amount actually  purchased  during the 13-month period be more or less than that
indicated  in the Letter,  an  adjustment  in the sales  charge will be made.  A
purchase not made pursuant to a Letter of Intention  may be included  thereafter
if the Letter is filed within 90 days of such purchase. Any shareholder may also
obtain the reduced  sales  charge by  including  the value (at current  offering
<PAGE>

   
price) of all his  shares in the Trust and other  Pioneer  mutual  funds  except
directly  purchased Class A shares of Pioneer Money Market Trust, held of record
as of the date of this Letter of Intention as a credit  toward  determining  the
applicable  scale of sales charge for the Class A shares to be  purchased  under
the Letter of Intention.
    

     The Letter of Intention  authorizes  PSC to escrow shares having a purchase
price equal to 5% of the stated investment in the Letter of Intention.  A Letter
of Intention is not a binding  obligation upon the investor to purchase,  or the
Trust to sell,  the full  amount  indicated  and the  investor  should  read the
provisions thereof carefully before signing.

14.  SYSTEMATIC WITHDRAWAL PLAN

     The Systematic  Withdrawal Plan ("SWP") is designed to provide a convenient
method of receiving fixed payments at regular intervals from shares of the Trust
deposited  by the  applicant  under  this SWP.  Withdrawals  from  Class B share
accounts  are limited to 10% of the value of the account at the time the plan is
implemented (see the Prospectus).  You must deposit or purchase for deposit with
PSC shares of the Trust having a total value of not less than $10,000.  Periodic
payments of $50 or more will be deposited  monthly or quarterly  directly into a
bank account  designated  by you, or will be sent by check to you, or any person
designated by you. A designation of a third party to receive checks  requires an
acceptable signature guarantee.

     Any income dividends or capital gains distributions on shares under the SWP
will be credited to the SWP account on the payment  date in full and  fractional
shares at the net asset value per share in effect on the record date.

     SWP payments are made from the proceeds of the redemption of Class A shares
deposited  under  the  SWP  in a  SWP  account.  Such  redemptions  are  taxable
transactions.  To the extent  that such  redemptions  for  periodic  withdrawals
exceed  dividend income  reinvested in the SWP account,  such  redemptions  will
reduce and may  ultimately  exhaust  the number of shares  deposited  in the SWP
account. In addition, the amounts received by a shareholder cannot be considered
as an  actual  yield or  income on his or her  investment  because  part of such
payments may be a return of his or her capital.

     The SWP may be terminated at any time (1) by written  notice to PSC or from
PSC to the shareholder;  (2) upon receipt by PSC of appropriate  evidence of the
shareholder's death; or (3) when all shares under the SWP have been redeemed.
<PAGE>

15.  DETERMINATION OF NET ASSET VALUE

     The net asset value per share of each Class of the Trust is  determined  as
of the close of regular trading on the New York Stock Exchange (the  "Exchange")
(normally 4:00 p.m., Eastern Time) on each day on which the Exchange is open for
business.  As of the  date of this  Statement  of  Additional  Information,  the
Exchange is open for trading  every weekday  except for the following  holidays:
New Year's Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence Day,
Labor Day,  Thanksgiving Day and Christmas Day. The net asset value per share of
each Class of the Trust is also  determined  on any other day in which the level
of trading in its portfolio securities is sufficiently high that the current net
asset  value per share might be  materially  affected by changes in the value of
its portfolio  securities.  The Trust is not required to determine its net asset
value per share on any day in which no  purchase  orders  for the  shares of the
Trust become effective and no shares are tendered for redemption.

     The net asset  value per share of each  class of the Trust is  computed  by
taking  the  amount of the value of all the  Trust's  assets  attributable  to a
class, less the Trust's liabilities  attributable to a class, and dividing it by
the number of outstanding  shares of that class. For purposes of determining net
asset  value,  expenses of the classes of the Trust are accrued  daily and taken
into account.

       
16.  INVESTMENT RESULTS

     The Trust's yield quotations and average annual total return quotations for
each class of its shares as that information may appear in the Prospectus,  this
Statement of Additional Information or in advertising are calculated by standard
methods prescribed by the Securities and Exchange Commission.

Standardized Yield Quotations

     Yield  quotations  for Class A and Class B shares are  computed by dividing
the net investment income per share attributable to a class during a base period
of 30 days, or one month, by the maximum  offering price per share of that class
of the  Trust  on the  last  day of such  base  period  in  accordance  with the
following formula:
<PAGE>

                                    a-b
             YIELD = 2[          ( ----- +1)6-1]
                                    cd

Where:        a       =   interest earned during the period

              b       =   net expenses accrued for the period

              c       =   the average daily number of shares 
                          outstanding during the period that 
                          were entitled to receive dividends

             d        =   the maximum offering price per share 
                          on the last day of the period

For purposes of calculating  interest earned on debt  obligations as provided in
item "a" above:

     (i) The yield to maturity of each  obligation held by the Trust is computed
based on the market value of the obligation  (including actual accrued interest,
if any) at the close of  business  each day during the 30-day base  period,  or,
with respect to obligations purchased during the month, the purchase price (plus
actual  accrued  interest,  if any) on  settlement  date,  and with  respect  to
obligations sold during the month the sale price (plus actual accrued  interest,
if any) between the trade and settlement dates.

     (ii) The yield to maturity of each  obligation  is then  divided by 360 and
the  resulting  quotient is  multiplied  by the market  value of the  obligation
(including actual accrued interest,  if any) to determine the interest income on
the obligation for each day. The yield to maturity  calculation has been made on
each obligation during the 30 day base period.

     (iii)  Interest  earned on all debt  obligations  during  the 30-day or one
month period is then totaled.

     (iv) The maturity of an  obligation  with a call  provision(s)  is the next
call date on which the obligation reasonably may be expected to be called or, if
none, the maturity date.

     With respect to the  treatment of discount and premium on mortgage or other
receivables-backed  obligations  which are  expected  to be  subject  to monthly
payments of principal and interest ("pay downs"), the Trust accounts for gain or
loss  attributable  to actual  monthly  pay downs as an  increase or decrease to
interest  income  during the  period.  In  addition,  the Trust may elect (i) to
amortize the discount or premium  remaining on a security,  based on the cost of
<PAGE>

the security,  to the weighted  average  maturity  date, if such  information is
available,  or to the remaining  term of the security,  if the weighted  average
maturity date is not available,  or (ii) not to amortize the discount or premium
remaining on a security.

   
     The Trust's  yield for the 30 days ended  December 31, 1994,  determined in
accordance  with the  formula  above for Class A shares  was 6.75% and 6.34% for
Class B shares, except that absent expense limitations,  the Trust's yield would
have been 6.69% for Class A shares and 6.28% for Class B shares.
    

Standardized Average Annual Total Return Quotations

     One of the primary  methods used to measure the  performance  of a class of
the  Trust is  "total  return."  "Total  return"  will  normally  represent  the
percentage change in value of an account,  or of a hypothetical  investment in a
class of the  Trust,  over any  period up to the  lifetime  of that class of the
Trust.  Total return  calculations  will usually assume the  reinvestment of all
dividends and capital gains  distributions and will be expressed as a percentage
increase or decrease from an initial value,  for the entire period or for one or
more specified  periods within the entire period.  Total return  percentages for
periods  of less  than  one  year  will  usually  be  annualized;  total  return
percentages  for periods  longer than one year will  usually be  accompanied  by
total return  percentages  for each year within the period and/or by the average
annual compounded total return for the period. The income and capital components
of a given return may be separated  and  portrayed in a variety of ways in order
to illustrate their relative significance.  Performance may also be portrayed in
terms of cash or investment values, without percentages. Past performance cannot
guarantee any particular future result.

     Average  annual total return  quotations for Class A and Class B shares are
computed  by finding the average  annual  compounded  rates of return that would
cause a  hypothetical  investment  in that  class  made  on the  first  day of a
designated  period (assuming all dividends and  distributions are reinvested) to
equal the ending  redeemable value of such  hypothetical  investment on the last
day of the designated period in accordance with the following formula:

                       P(1+T)n  =  ERV

Where:      P       =       a hypothetical initial payment of $1000, less
                            the maximum sales load of $45 for Class A shares
                            or the deduction of the CDSC for Class B shares
                            at the end of the period.

            T       =       average annual total return
<PAGE>

            n       =       number of years

            ERV     =       ending redeemable value of the hypothetical $1000
                            initial payment made at the beginning of the
                            designated period (or fractional portion thereof)

For  purposes of the above  computation,  it is assumed that all  dividends  and
distributions  made by the Trust are  reinvested  at net asset value  during the
designated  period.  The average annual total return  quotation is determined to
the nearest 1/100 of 1%.

     In  determining  the average  annual total return  (calculated  as provided
above),  recurring fees, if any, that are charged to all shareholder accounts of
a particular class are taken into consideration.  For any account fees that vary
with the size of the  account,  the account  fee used for  purposes of the above
computation  is assumed  to be the fee that would be charged to the class'  mean
account size.

   
     The  average  annual  total  return of the Trust for Class A shares for the
one- and  five-year  periods  ended  December  31,  1994 and for the period from
inception (May 31, 1988) through December 31, 1994 were -8.26%, 5.46% and 6.45%,
respectively.  The total  return of the Trust for Class B shares  for the period
from April 29,  1994  through  December  31,  1994 was  -4.39%.  Absent  expense
limitations in effect during these two periods,  the average annual total return
of the Trust would have been lower than the returns quoted above.
    

Other Quotations, Comparisons, and General Information

     From time to time, in advertisements, in sales literature, or in reports to
shareholders,  the past  performance  of the  Trust  may be  illustrated  and/or
compared with that of other mutual funds with similar investment objectives, and
to other  relevant  indices.  For example,  yield of the Trust's  classes may be
compared to the Shearson  Lehman Hutton  Government  Index,  U.S Government bond
rates, or other comparable indices or investment vehicles.

   
     In addition, the performance of the classes of the Trust may be compared to
alternative  investment or savings  vehicles  and/or to indexes or indicators of
economic activity,  e.g., inflation or interest rates.  Performance rankings and
listings reported in newspapers or national business and financial publications,
such as Barron's,  Business Week, Consumer's Digest, Consumer Reports, Financial
World, Forbes, Fortune,  Investors Business Daily,  Kiplinger's Personal Finance
Magazine,  Money Magazine, the New York Times, Smart Money, USA Today, U.S. News
and World  Report,  The Wall Street  Journal and Worth may also be cited (if the
<PAGE>

Trust is  listed in any such  publication)  or used for  comparison,  as well as
performance listings and rankings from various other sources including Bloomberg
Financial Systems,  CDA/Wiesenberger  Investment  Companies Service,  Donoghue's
Mutual Fund Almanac,  Investment  Company Data, Inc.,  Johnson's  Charts,  Kanon
Bloch Carre & Co., Micropal,  Inc.,  Morningstar,  Inc.,  Schabacker  Investment
Management and Towers Data Systems.
    

     In addition,  from time to time,  quotations  from articles from  financial
publications,  such as those listed  above,  may be used in  advertisements,  in
sales literature or in reports to shareholders of the Trust.

     The  Trust may also  present,  from  time to time,  historical  information
depicting  the value of a  hypothetical  account  in one or more  classes of the
Trust since the Trust's inception.

     In presenting  investment results, the Trust may also include references to
certain  financial  planning  concepts,  including  (a) an  investor's  need  to
evaluate his financial  assets and  obligations to determine how much to invest;
(b) his need to analyze the objectives of various investments to determine where
to invest;  and (c) his need to analyze his time frame for future  capital needs
to determine how long to invest. The investor controls these three factors,  all
of which affect the use of investments in building assets.

Automated Information Line (FactFone)

     FactFone, Pioneer's 24-hour automated information line, allows shareholders
to dial toll-free 1-800-225-4321 and hear recorded fund information, including:

   
     o    net asset value prices for all Pioneer mutual funds;

     o    annualized 30-day yields on Pioneer's bond funds;

     o    annualized  7-day  yields and 7-day  effective  (compound)  yields for
          Pioneer's money market funds; and

     o    dividends and capital gains distributions on all Pioneer mutual funds.
    

     Yields are calculated in accordance with Securities and Exchange Commission
mandated standard formulas.

     In addition, by using a personal identification number (PIN),  shareholders
may access their  account  balance and last three  transactions  and may order a
duplicate statement.
<PAGE>

     All  performance  numbers  communicated  through  FactFone  represent  past
performance,  and  figures  for all quoted  bond funds  include  the  applicable
maximum sales charge.  A  shareholder's  actual yield and total return will vary
with changing market conditions. The value of Class A and Class B shares (except
for Pioneer money market funds, which seek a stable $1.00 share price) will also
vary and may be worth more or less at redemption than their original cost.


       


<PAGE>


                                   APPENDIX A

                           Other Pioneer Information


     The Pioneer group of mutual funds was established in 1928 with the creation
of Pioneer Fund.  Pioneer is one of the oldest,  most  respected and  successful
money managers in the United States.

     As of December 31, 1994,  PMC employed a professional  investment  staff of
46, with a combined  average of 14 years'  experience in the financial  services
industry.

     At  December  31,  1994,  there  were  591,192  non-retirement  shareholder
accounts and 337,577 retirement  shareholder  accounts in Pioneer's funds. Total
assets  for  all  Pioneer  Funds  at  December  31,  1994  were  $10,038,000,000
representing a total of 928,769 shareholder accounts.











                                      A-1







               

<PAGE>
<TABLE>
<CAPTION>
                                           Pioneer America Income Trust

Date        Initial Investment     Offering Price      Sales Charge     Shares Purchased    Net Asset Value     Initial Net Asset
                                                         Included                              Per Share              Value
<S>             <C>                   <C>                 <C>                 <C>               <C>                  <C>   
6/1/88          $10,000               $10.47              4.50%               955.11            $10.00               $9,551


</TABLE>
                                     Dividends and Capital Gains Reinvested
<TABLE>
<CAPTION>

                                                Value of Shares

Date           From        From Cap. Gains      From Dividends        Total Value
            Investment       Reinvested           Reinvested

<S>           <C>               <C>                  <C>                 <C>   
12/31/88      $9,418            $0                   $492                $9,910
12/31/89      $9,589            $0                 $1,460               $11,049
12/31/90      $9,580            $0                 $2,463               $12,043
12/31/91      $9,885            $0                 $3,620               $13,505
12/31/92      $9,809            $0                 $4,597               $14,406
12/31/93     $10,010           $52                 $5,652               $15,714
12/31/94      $8,987           $47                 $6,055               $15,089

</TABLE>





<PAGE>


                               INDEX DESCRIPTIONS

LONG-TERM MUNICIPAL BOND PORTFOLIO *
For the 1926 to 1984 period, returns are calculated form yields on 20-year prime
issues from Solomon  Brothers'  Analytical  Record of Yields and Yields Spreads,
assuming coupon equals previous year-end yield and a 20-year maturity.  For 1985
to the present,  returns are  calculated  using  Moody's Bond Record,  using the
December  average  municipal  yield as the  beginning-of-following  year  coupon
(average of Aaa, Aa, A, Baa grades).

LONG-TERM CORPORATE BONDS *
For 1969 through  1991,  corporate  bond total  returns are  represented  by the
Salomon Brothers  Long-Term  High-Grade  Corporate Bond Index.  Since most large
corporate bond transactions  take place over the counter,  a major dealer is the
natural source of these data.  The index  includes  nearly all Aaa- and Aa-rated
bonds.  If a bond is downgraded  during a particular  month,  its return for the
month is included in the index before removing the bond from future  portfolios.
For 1926 through  1968,  total  returns were  calculated  by summing the capital
appreciation  returns and the income returns.  For the period 1946 through 1968,
Ibbotson and Sinquefield  backdated the Salomon  Brothers' index,  using Salomon
Brothers' monthly yield data with a methodology  similar to that used by Salomon
for 1969-1991. Capital appreciation returns were calculated from yields assuming
(at the beginning of each monthly  holding  period) a 20-year  maturity,  a bond
price equal to par, and a coupon equal to the beginning-of-period yield. For the
period 1926-1945, the Standard and Poor's monthly High-Grade Corporate Composite
yield data were used,  assuming a 4 percent coupon and a 20-year  maturity.  The
conventional  present-value  formula  for  bond  price  for  the  beginning  and
end-of-month  prices was used.  (This formula is presented in Ross,  Stephen A.,
and Randolph W. Westerfield,  Corporate Finance, Times Mirror/ Mosby, St. Louis,
1990, p. 97 ["Level-Coupon Bonds"].) The monthly income return was assumed to be
one-twelfth the coupon.

LONG-TERM GOVERNMENT BOND TOTAL RETURN *
The  total  returns  on  long-term  government  bonds  from  1977  to  1991  are
constructed  with data from The Wall Street Journal.  Over  1926-1976,  data are
obtained  from the  Government  Bond File at the Center for Research in Security
Prices (CRSP), Graduate School of Business,  University of Chicago. Each year, a
one-bond  portfolio  with a term of  approximately  20  years  and a  reasonably
current  coupon  was used,  and whose  returns  did not  reflect  potential  tax
benefits,  impaired  negotiability,  or special  redemption or call  privileges.
Where  callable  bonds had to be used,  the term of the bond was assumed to be a
simple  average of the maturity and first call dates minus the current date. The
bond was "held" for the calendar year and returns were  computed.  Total returns
for  1977-1991 are  calculated  as the change in the flat price or  and-interest
price.

INTERMEDIATE-TERM GOVERNMENT BONDS TOTAL RETURN *
Total  returns  of the  intermediate-term  government  bonds for  1977-1991  are
calculated from The Wall Street Journal prices,  using the change in flat price.
Returns for 1934 through 1986 are obtained from the CRSP  Government  Bond File.
<PAGE>

                               INDEX DESCRIPTIONS


Each year,  one-bond  portfolios  are formed,  the bond  chosen is the  shortest
noncallable  bond with a maturity not less than 5 years, and this bond is "held"
for the  calendar  year.  Monthly  returns are  computed.  (Bonds with  impaired
negotiability or special redemption  privileges are omitted, as are partially or
fully  tax-exempt  bonds  starting  with 1943.) For the period from 1934 through
1942,  almost all bonds with  maturities  near 5 years  were  partially  or full
tax-exempt and were selected using the rules described above. Personal tax rates
were  generally  low in that  period,  so that yields on  tax-exempt  bonds were
similar to yields on taxable bonds.  Between 1926 and 1933,  there are few bonds
suitable for construction of a series with a 5-year  maturity.  For this period,
five year bond yield estimates are used.

U.S. (30 DAY) TREASURY BILL TOTAL RETURNS *
For the U.S. Treasury bill index, data from The Wall Street Journal are used for
1977-1991;  the CRSP U.S.  Government  Bond File is the  source of data  through
1976. Each month a one-bill  portfolio  containing the shortest-term bill having
not less than one month to maturity is constructed. (The bill's original term to
maturity is not  relevant.) To measure  holding  period returns for the one-bill
portfolio,  the  bill is  priced  as of the  last  trading  day of the  previous
month-end and as of the last trading day of the current month.

BANK SAVINGS ACCOUNT **
Data sources include the U.S. League of Savings Institutions Sourcebook; average
annual yield on savings  deposits in FSLIC [FDIC] insured  savings  institutions
for the years 1963-1987 and The Wall Street Journal for the years 1988-1994.

6 MONTH CD **
Data sources include the Federal Reserve Bulletin and The Wall Street Journal.









Sources:    *  Ibbotson Associates
           **  Towers Data Systems

<PAGE>

<TABLE>
<CAPTION>

                       COMPARATIVE PERFORMANCE STATISTICS

             Municipal  U.S. Long Term  U.S. Long Term   U.S. Interm.    U.S.(30Day)     Bank Savings
             Long term   Corporate Bds    Govt Bonds      Govt Bonds    Treasury Bill       Account            6 Month CD
               %TR *    %Total Return * %Total Return * %Total Return * %Total Return *  %Total Return **   %Total Return **
                                                                                                 
<S>            <C>           <C>             <C>             <C>             <C>             <C>                  <C>      
Dec 1928       0.55          2.84            0.10            0.92            3.56            N/A                  N/A
Dec 1929       3.22          3.27            3.42            6.01            4.75            N/A                  N/A
Dec 1930       6.52          7.98            4.66            6.72            2.41            5.30                 N/A
Dec 1931      -3.53         -1.85           -5.31           -2.32            1.07            5.10                 N/A
Dec 1932       8.19         10.82           16.84            8.81            0.96            4.10                 N/A
Dec 1933      -2.17         10.38           -0.07            1.83            0.30            3.40                 N/A
Dec 1934      21.66         13.84           10.03            9.00            0.16            3.50                 N/A
Dec 1935       9.18          9.61            4.98            7.01            0.17            3.10                 N/A
Dec 1936     -15.13          6.74            7.52            3.06            0.18            3.20                 N/A
Dec 1937      28.38          2.75            0.23            1.56            0.31            3.50                 N/A
Dec 1938       9.24          6.13            5.53            6.23           -0.02            3.50                 N/A
Dec 1939       5.70          3.97            5.94            4.52            0.02            3.40                 N/A
Dec 1940      10.52          3.39            6.09            2.96            0.00            3.30                 N/A
Dec 1941      -0.80          2.73            0.93            0.50            0.06            3.10                 N/A
Dec 1942       2.09          2.60            3.22            1.94            0.27            3.00                 N/A
Dec 1943       6.51          2.83            2.08            2.81            0.35            2.90                 N/A
Dec 1944       4.15          4.73            2.81            1.80            0.33            2.80                 N/A
Dec 1945       5.76          4.08           10.73            2.22            0.33            2.50                 N/A
Dec 1946      -3.77          1.72           -0.10            1.00            0.35            2.20                 N/A
Dec 1947      -4.04         -2.34           -2.62            0.91            0.50            2.30                 N/A
Dec 1948       3.79          4.14            3.40            1.85            0.81            2.30                 N/A
Dec 1949      14.39          3.31            6.45            2.32            1.10            2.40                 N/A
Dec 1950       4.15          2.12            0.06            0.70            1.20            2.50                 N/A
Dec 1951      -3.65         -2.69           -3.93            0.36            1.49            2.60                 N/A
Dec 1952      -3.21          3.52            1.16            1.63            1.66            2.70                 N/A
Dec 1953       0.38          3.41            3.64            3.23            1.82            2.80                 N/A
Dec 1954       3.74          5.39            7.19            2.68            0.86            2.90                 N/A
Dec 1955      -1.21          0.48           -1.29           -0.65            1.57            2.90                 N/A
Dec 1956      -7.61         -6.81           -5.59           -0.42            2.46            3.00                 N/A
Dec 1957       5.92          8.71            7.46            7.84            3.14            3.30                 N/A
Dec 1958      -2.56         -2.22           -6.09           -1.29            1.54            3.38                 N/A
Dec 1959      -3.43         -0.97           -2.26           -0.39            2.95            3.53                 N/A
Dec 1960       8.61          9.07           13.78           11.76            2.66            3.86                 N/A
Dec 1961       2.37          4.82            0.97            1.85            2.13            3.90                 N/A
Dec 1962       7.68          7.95            6.89            5.56            2.73            4.08                 N/A
Dec 1963      -0.84          2.19            1.21            1.64            3.12            4.17                 N/A
Dec 1964       4.59          4.77            3.51            4.04            3.54            4.19                 4.18
Dec 1965      -2.74         -0.46            0.71            1.02            3.93            4.23                 4.68
Dec 1966       0.58          0.20            3.65            4.69            4.76            4.45                 5.75
Dec 1967      -4.41         -4.95           -9.18            1.01            4.21            4.67                 5.48
<PAGE>

                       COMPARATIVE PERFORMANCE STATISTICS

             Municipal  U.S. Long Term  U.S. Long Term   U.S. Interm.    U.S.(30Day)     Bank Savings
             Long term   Corporate Bds    Govt Bonds      Govt Bonds    Treasury Bill       Account            6 Month CD
               %TR *    %Total Return * %Total Return * %Total Return * %Total Return *  %Total Return **   %Total Return **
                                                                                                 
<S>            <C>           <C>             <C>             <C>             <C>             <C>                  <C>      
Dec 1968      -0.96          2.57           -0.26            4.54            5.21            4.68            6.44
Dec 1969     -15.39         -8.09           -5.07           -0.74            6.58            4.80            8.71
Dec 1970      21.10         18.37           12.11           16.86            6.52            5.14            7.06
Dec 1971      12.26         11.01           13.23            8.72            4.39            5.30            5.36
Dec 1972       1.51          7.26            5.69            5.16            3.84            5.37            5.38
Dec 1973       4.27          1.14           -1.11            4.61            6.93            5.51            8.60
Dec 1974     -10.66         -3.06            4.35            5.69            8.00            5.96           10.20
Dec 1975      11.55         14.64            9.20            7.83            5.80            6.21            6.51
Dec 1976      15.79         18.65           16.75           12.87            5.08            6.23            5.22
Dec 1977       3.87          1.71           -0.69            1.41            5.12            6.39            6.12
Dec 1978      -3.98         -0.07           -1.18            3.49            7.18            6.56           10.21
Dec 1979       1.02         -4.18           -1.23            4.09           10.38            7.29           11.90
Dec 1980     -17.57         -2.76           -3.95            3.91           11.24            8.78           12.33
Dec 1981     -15.52         -1.24            1.86            9.45           14.71           10.71           15.50
Dec 1982      47.94         42.56           40.36           29.10           10.54           11.19           12.18
Dec 1983       3.34          6.26            0.65            7.41            8.80            9.71           9.65
Dec 1984       8.41         16.86           15.48           14.02            9.85            9.92           10.65
Dec 1985      24.03         30.09           30.97           20.33            7.72            9.02            7.82
Dec 1986      27.31         19.85           24.53           15.14            6.16            7.84            6.30
Dec 1987      -5.06         -0.27           -2.71            2.90            5.47            6.92            6.58
Dec 1988      11.47         10.70            9.67            6.10            6.35            7.20            8.15
Dec 1989      14.64         16.23           18.11           13.29            8.37            7.91            8.27
Dec 1990      6.54           6.78            6.18            9.73            7.81            7.8             7.85
Dec 1991      11.18         19.89           19.30           15.46            5.60            4.61            4.95
Dec 1992      10.80          9.39            8.05            7.19            3.51            2.89            3.27
Dec 1993      14.16         13.19           18.24           11.24            2.90            2.73            2.88
Dec 1994      -8.63         -5.76           -7.77           -5.14            3.90            4.96            5.4
</TABLE>



                        * Source:   Ibbotson Associates
                        ** Source:   Towers Data Systems
<PAGE>


<PAGE>
                          PIONEER AMERICA INCOME TRUST

                           PART C. OTHER INFORMATION


Item 24.  Financial Statements and Exhibits

              (a)     Financial Statements:

   
                      The   financial   statements   of   the   Registrant   are
                      incorporated  by reference  from the 1994 Annual Report to
                      Shareholders  which is  attached  to and  incorporated  by
                      reference   into  Part  B,  the  Statement  of  Additional
                      Information.
    

              (b)     Exhibits:

   
                      1.    Amended and Restated Declaration of Trust,
                            dated December 7, 1993.*/_

                      1.2   Establishment and Designation of Classes._

                      2.    By-Laws.*

                      3.    None.

                      4.    None.

                      5.    Management Contract with Pioneering
                            Management Corporation, dated
                            January 1, 1994.*/_

                      6.1   Underwriting Agreement with Pioneer Funds
                            Distributor, Inc.*

                      6.2   Form of Dealer Sales Agreement.*/_

                      7.    None.

                      8.    Custodian Agreement with Brown
                            Brothers Harriman & Co.*/_
<PAGE>

                      9.    Investment Company Service Agreement with
                            Pioneering Services Corporation.*

                      10.   Opinion and Consent of Counsel.*

                      11.   Consent of Independent Public Accountants._

                      12.   None.

                      13.   Stock Purchase Agreement.*

                      14.   None.

                      15.1  Class A Shares Distribution Plan.*/_

                      15.2  Class B Shares Distribution Plan.*/_

                      16.   Description of Average Annual Total Return
                            and Yield Calculation.*/_

                      17.   Financial Data Schedule._

                      18.   None.

                      19.   Powers of Attorney.*/_
    


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

_ Filed herewith.

   
* Previously  filed.  Incorporated by reference from the exhibits filed with the
Registration  Statement,  as  amended,  of the  Registrant  (File Nos.  2-20795;
811-5516).
    


Item 25.      Persons Controlled By or Under
              Common Control With Registrant

              The Pioneer Group, Inc., a Delaware corporation ("PGI"), owns 100%
of the  outstanding  capital  stock  of  Pioneering  Management  Corporation,  a
Delaware corporation ("PMC"),  Pioneering Services Corporation ("PSC"),  Pioneer
Capital Corporation ("PCC"), Pioneer Fonds Marketing GmbH ("GmbH"), Pioneer SBIC
Corp. ("SBIC"),  Pioneer Associates,  Inc., Pioneer  International  Corporation,
Pioneer Plans  Corporation  ("PPC"),  Pioneer  Goldfields  Limited ("PGL"),  and
<PAGE>

   
Pioneer Investments  Corporation  ("PIC"), all Massachusetts  corporations.  PMC
owns 100% of the outstanding capital stock of Pioneer Funds Distributor, Inc., a
Massachusetts Corporation ("PFD"). PGI also owns 100% of the outstanding capital
stock of Pioneer Metals and Technology,  Inc. ("PMT"),  a Delaware  corporation,
and Pioneer  First Polish Trust Fund Joint Stock  Company  ("First  Polish"),  a
Polish  corporation.  PGI  owns  90%  of the  outstanding  shares  of  Teberebie
Goldfields  Limited ("TGL").  Pioneer Winthrop Advisers ("PWA"), a Massachusetts
general  partnership,  is a joint  venture  between PGI and  Winthrop  Financial
Associates, a Limited Partnership, a Delaware limited partnership. Pioneer Fund,
Pioneer II,  Pioneer Three,  Pioneer Bond Fund,  Pioneer  Intermediate  Tax-Free
Fund, Pioneer Growth Trust,  Pioneer Europe Fund, Pioneer  International  Growth
Fund, Pioneer Short-Term Income Trust,  Pioneer Tax-Free State Series Trust, and
the  Registrant  (each of the  foregoing,  Massachusetts  business  trust),  and
Pioneer  Interest  Shares,  Inc. (a Nebraska  corporation)  and Pioneer Emerging
Markets Fund,  Pioneer Growth Shares,  Pioneer Income Fund,  Pioneer India Fund,
Pioneer  Money  Market  Trust and  Pioneer  Tax-Free  Income  Fund  (each of the
foregoing,  a Delaware  business trust) are all parties to management  contracts
with  PMC.  Pioneer  Winthrop  Real  Estate  Investment  Fund  is a  party  to a
sub-investment  management  contract with PMC. PCC owns 100% of the  outstanding
capital  stock of SBIC.  SBIC is the sole  general  partner of Pioneer  Ventures
Limited Partnership,  a Massachusetts  limited  partnership.  John F. Cogan, Jr.
owns  approximately 15% of the outstanding  shares of PGI. Mr. Cogan is Chairman
of the Board, President and Trustee of the Registrant and of each of the Pioneer
mutual funds; Director and President of PGI; President and Director of PPC, PIC,
Pioneer International  Corporation and PMT; Director of PCC and PSC; Chairman of
the Board and Director of PMC, PFD and TGL; Chairman,  President and Director of
PGL;  Chairman of the  Supervisory  Board of GmbH;  Chairman and Chief Executive
Officer of PWA;  Chairman  and Member of  Supervisory  Board of First Polish and
Chairman and Partner, Hale and Dorr.
    

Item 26.      Number of Holders of Securities

   
              The following  table sets forth the  approximate  number of record
holders of each class of securities of the Registrant as of March 31, 1995:

                                     Class A                Class B

Number of Record Holders:            11,003                   142
    

<PAGE>

Item 27.      Indemnification

   
              Except for the Amended  and  Restated  Declaration  of Trust dated
December 7, 1993 establishing the Registrant as a Trust under Massachusetts law,
there is no contract,  arrangement or statute under which any director, officer,
underwriter or affiliated  person of the  Registrant is insured or  indemnified.
The Declaration of Trust provides that no Trustee or officer will be indemnified
against any  liability  of which the  Registrant  would  otherwise be subject by
reason of or for willful  misfeasance,  bad faith,  gross negligence or reckless
disregard of such person's duties.
    

              Insofar  as  indemnification   for  liability  arising  under  the
Securities  Act of 1933, as amended (the "Act"),  may be available to directors,
officers and  controlling  persons of the  Registrant  pursuant to the foregoing
provisions, or otherwise, the Registrant has been advised that in the opinion of
the Securities and Exchange  Commission such  indemnification  is against public
policy as expressed in the Act and is,  therefore,  unenforceable.  In the event
that a claim  for  indemnification  against  such  liabilities  (other  than the
payment of the Registrant of expenses incurred or paid by a director, officer or
controlling  person of the Registrant in the  successful  defense of any action,
suit or proceeding) is asserted by such director,  officer or controlling person
in connection with the securities being registered,  the Registrant will, unless
in the  opinion  of its  counsel  the matter  has been  settled  by  controlling
precedent,  submit to a court of appropriate  jurisdiction  the question whether
such  indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.


Item 28.      Business and other Connections of Investment Adviser

              All of the  information  required by this item is set forth in the
Forms ADV, as amended,  of  Pioneering  Management  Corporation.  The  following
sections of such Forms ADV are incorporated herein by reference:

          (a)  Items 1 and 2 of Part 2;

          (b)  Section 6, Business Background, of each Schedule D.


Item 29.      Principal Underwriter

          (a)  See Item 25 above.

          (b)  Directors and Officers of PFD:

<PAGE>
<TABLE>
<CAPTION>

                                 Positions and Offices                     Positions and Offices
Name                             with Underwriter                          with Registrant

<S>                              <C>                                       <C>   
John F. Cogan, Jr.               Director and Chairman                     Chairman of the Board,
                                                                           President and Trustee

Robert L. Butler                 Director and President                    None

David D. Tripple                 Director                                  Executive Vice
                                                                           President and Trustee

   
Steven M. Graziano               Senior Vice President                     None
    

Stephen W. Long                  Senior Vice President                     None

       
John W. Drachman                 Vice President                            None

   
Barry G. Knight                  Vice President                            None
    

William A. Misata                Vice President                            None

Anne W. Patenaude                Vice President                            None

   
Elizabeth B. Rice                Vice President                            None

Gail A. Smyth                    Vice President                            None
    

Constance D. Spiros              Vice President                            None

Marcy L. Supovitz                Vice President                            None

Steven R. Berke                  Assistant                                 None
                                  Vice President

       
   
Mary Sue Hoban                   Assistant                                 None
                                  Vice President
    

William H. Keough                Treasurer                                 Treasurer

Roy P. Rossi                     Assistant Treasurer                       None

Joseph P. Barri                  Clerk                                     Secretary
</TABLE>

              (c) Not applicable.
<PAGE>


Item 30.      Location of Accounts and Records

              The accounts and records are maintained at the Registrant's office
at 60 State Street, Boston, Massachusetts; contact the Treasurer.


Item 31.      Management Services

              The  Registrant is not a party to any  management-related  service
contract,  except as described in the Prospectus and the Statement of Additional
Information.

Item 32.      Undertakings

   
              (a) Not applicable.

              (b) Not applicable.

              (c) The  Registrant  hereby  undertakes  to deliver or cause to be
delivered with the Prospectus,  to each person to whom the Prospectus is sent or
given, a copy of the Registrant's  report to shareholders  furnished pursuant to
and meeting the requirements of Rule 30d-1 from which the specified  information
is incorporated by reference,  unless such person  currently holds securities of
the Registrant  and otherwise has received a copy of such report,  in which case
the  Registrant  shall state in the  Prospectus  that it will  furnish,  without
charge,  a copy of such report on request,  and the name,  address and telephone
number of the person to whom such a request should be directed.

    


<PAGE>


                                   SIGNATURES


   
     Pursuant  to  the  requirements  of the  Securities  Act of  1933  and  the
Investment   Company  Act  of  1940,   the   Registrant  has  duly  caused  this
Post-Effective  Amendment No. 9 (the "Amendment") to its Registration  Statement
(which  meets all the  requirements  for  effectiveness  pursuant to Rule 485(b)
under the Securities Act of 1933) to be signed on its behalf by the undersigned,
thereunto  duly   authorized,   in  the  City  of  Boston  and  Commonwealth  of
Massachusetts, on the ____ day of April, 1995.
    

                                                 PIONEER AMERICA INCOME TRUST




                                                 Joseph P. Barri
                                                 Secretary

     Pursuant to the  requirements of the Securities Act of 1933, this Amendment
has been signed  below by the  following  persons in the  capacities  and on the
dates indicated:

     Title and Signature                                  Date

Principal Executive Officer:                     )
                                                 )
                                                 )
/s/John F. Cogan, Jr.*                           )
John F. Cogan, Jr., President                    )
                                                 )
                                                 )
Principal Financial and                          )
Accounting Officer:                              )
                                                 )
                                                 )
/s/William H. Keough*                            )
William H. Keough, Treasurer                     )
                                                 )
                                                 )
Trustees:                                        )
                                                 )
/s/John F. Cogan, Jr.*                           )
John F. Cogan, Jr.                               )
                                                 )
                                                 )
/s/Richard H. Egdahl, M.D.*                      )
Richard H. Egdahl, M.D.                          )
                                                 )
<PAGE>

                                                 )
/s/Margaret B. W. Graham*                        )
Margaret B. W. Graham                            )
                                                 )
                                                 )
/s/John W. Kendrick*                             )
John W. Kendrick                                 )
                                                 )
                                                 )
/s/Marguerite A. Piret*                          )
Marguerite A. Piret                              )
                                                 )
                                                 )
/s/David D. Tripple*                             )
David D. Tripple                                 )
                                                 )
                                                 )
/s/Stephen K. West*                              )
Stephen K. West                                  )
                                                 )
                                                 )
/s/John Winthrop*                                )
John Winthrop                                    )

- ---------


   
*  By:                                                   April __, 1995
      Joseph P. Barri
      Attorney-in-fact
    


<PAGE>


                                 Exhibit Index

Exhibit
Number        Document Title

   

1.   Amended and Restated Declaration of Trust, dated December 7, 1993.

1.2  Establishment and Designation of Classes.

5.   Management Contract with Pioneering Management  Corporation,  dated January
     1, 1994.

6.2  Form of Dealer Sales Agreement.

8.   Custodian Agreement with Brown Brothers Harriman & Co.

11.  Consent of Independent Public Accountants.

15.1 Class A Shares Distribution Plan.

15.2 Class B Shares Distribution Plan.

16.  Description of Average Annual Total Return and Yield Calculation.

17.  Financial Data Schedule.

19.  Powers of Attorney.


    





                   AMENDED AND RESTATED DECLARATION OF TRUST
                                       OF
                         PIONEER U.S. GOVERNMENT TRUST

                                60 STATE STREET
                          BOSTON, MASSACHUSETTS 02109

                                                           DECEMBER 7, 1993



<PAGE>


                               TABLE OF CONTENTS


                                                                  Page

ARTICLE I.  NAME AND DEFINITIONS

     1.1       Name................................................1
     1.2       Definitions.........................................1

ARTICLE II.  TRUSTEES

     2.1       General Powers......................................4
     2.2       Investments.........................................4
     2.3       Legal Title.........................................6
     2.4       Issuance and Repurchase of Shares...................7
     2.5       Delegation; Committees..............................7
     2.6       Collection and Payments.............................7
     2.7       Expenses............................................7
     2.8       Manner of Acting; By-laws...........................8
     2.9       Miscellaneous Powers................................8
     2.10      Principal Transactions..............................9
     2.11      Litigation..........................................9
     2.12      Number of Trustees..................................9
     2.13      Election and Term...................................9
     2.14      Resignation and Removal.............................10
     2.15      Vacancies...........................................10
     2.16      Delegation of Power to Other Trustees...............11

ARTICLE III.  CONTRACTS

     3.1       Underwriting Contract...............................11
     3.2       Advisory or Management Contract.....................11
     3.3       Administration Agreement............................12
     3.4       Service Agreement...................................12
     3.5       Transfer Agent......................................13
     3.6       Custodian...........................................13
     3.7       Affiliations of Trustees or Officers, Etc...........13
     3.8       Compliance with 1940 Act............................14
<PAGE>

ARTICLE IV.  LIMITATIONS OF LIABILITY OF SHAREHOLDERS,
                   TRUSTEES AND OTHERS

     4.1       No Personal Liability of Shareholders,
                 Trustees, Etc.....................................14
     4.2       Non-Liability of Trustees, Etc......................15
     4.3       Mandatory Indemnification...........................15
     4.4       No Bond Required of Trustees........................17
     4.5       No Duty of Investigation; Notice in Trust
                 Instruments, Etc..................................17
     4.6       Reliance on Experts, Etc............................18

ARTICLE V.  SHARES OF BENEFICIAL INTEREST

     5.1       Beneficial Interest.................................18
     5.2       Rights of Shareholders..............................19
     5.3       Trust Only..........................................19
     5.4       Issuance of Shares..................................19
     5.5       Register of Shares..................................20
     5.6       Transfer of Shares..................................20
     5.7       Notices.............................................20
     5.8       Treasury Shares.....................................21
     5.9       Voting Powers.......................................21
     5.10      Meetings of Shareholders............................22
     5.11      Series or Class Designation.........................22
     5.12      Assent to Declaration of Trust......................26

ARTICLE VI.  REDEMPTION AND REPURCHASE OF SHARES

     6.1       Redemption of Shares................................26
     6.2       Price...............................................27
     6.3       Payment.............................................27
     6.4       Effect of Suspension of Determination
                 of Net Asset Value................................27
     6.5       Repurchase by Agreement.............................28
     6.6       Redemption of Shareholder's Interest................28
     6.7       Redemption of Shares in Order to Qualify
                 as Regulated Investment Company;
                 Disclosure of Holding.............................28
     6.8       Reductions in Number of Outstanding Shares
                 Pursuant to Net Asset Value Formula...............29
     6.9       Suspension of Right of Redemption...................29
<PAGE>

ARTICLE VII.  DETERMINATION OF NET ASSET VALUE, NET
                    INCOME AND DISTRIBUTIONS

     7.1       Net Asset Value.....................................29
     7.2       Distributions of Shareholders.......................30
     7.3       Determination of Net Income; Reduction
                 of Outstanding Shares.............................31
     7.4       Power to Modify Foregoing Procedures................32

ARTICLE VIII.  DURATION; TERMINATION OF TRUST OR A
                     SERIES OR CLASS; AMENDMENT; MERGERS,
                     ETC.

     8.1       Duration............................................33
     8.2       Termination of the Trust or a Series
                 or a Class........................................33
     8.3       Amendment Procedure.................................34
     8.4       Merger, Consolidation and Sale of Assets............36
     8.5       Incoporation........................................36

ARTICLE IX.  REPORTS TO SHAREHOLDERS...............................37

ARTICLE X.  MISCELLANEOUS

     10.1      Execution and Filing................................37
     10.2      Governing Law.......................................37
     10.3      Counterparts........................................37
     10.4      Reliance by Third Parties...........................37
     10.5      Provisions in Conflict with Law or
                 Regulations.......................................38



<PAGE>



                   AMENDED AND RESTATED DECLARATION Of TRUST

                                       OF

                         PIONEER U.S. GOVERNMENT TRUST

     AMENDED AND  RESTATED  DECLARATION  OF TRUST made this 7th day of December,
1993 by John F. Cogan,  Jr., Richard H. Egdahl,  Margaret B.W.  Graham,  John W.
Hendrick,  Marguerite  A.  Piret,  David D.  Trippie,  Stephen  H. West and John
Winthrop  (together  with all other  persons  from  time to time  duly  elected,
qualified and serving as Trustees in accordance  with the  provisions of Article
II hereof, the "Trustees").

     WHEREAS,  pursuant to a  Declaration  of Trust dated  March 17,  1988,  the
Trustees  established  a trust  for the  investment  and  reinvestment  of funds
contributed thereto;

     WHEREAS,  in  accordance  with said  Declaration,  on March 17,  1988,  the
Trustees,  pursuant to a resolution  duly  adopted,  established  "Pioneer  U.S.
Government Trust" as the sole Series of the Trust;

     WHEREAS, said Declaration of Trust provides that the beneficial interest in
the trust assets be divided into transferable shares of beneficial trust;

     WHEREAS,  said  Declaration  of Trust  provides that all money and property
contributed to the Trust  thereunder  shall be held and managed in trust for the
benefit of the holders subject to the provisions thereof; and

     WHEREAS, the Trustees desire to amend and restate said Declaration of Trust
in its entirety, as hereinafter provided;

     NOW  THEREFORE,  the  undersigned,  being a majority of the Trustees of the
Trust, hereby amend and restate the Declaration in its entirety, as follows:

                                   ARTICLE I

                              NAME AND DEFINITIONS

     Section 1.1.  Name.  The name of the trust created  hereby is Pioneer "U.S.
Government Trust" (the "Trust").
<PAGE>

     Section 1.2.  Definitions.  Wherever  they are used herein,  the  following
terms have the following respective meanings:

               (a) "Administrator" means the party, other than the Trust, to the
contract described in Section 3.3 hereof.

               (b)  "By-laws"  means the  By-laws  referred  to in  Section  2.8
hereof, as amended from time to time.

               (c) "Class" means any division of shares  within a Series,  which
Class is or has been  established  within  such  Series in  accordance  with the
provisions of Article V.

               (d) The  terms  "Commission"  and  "Interested  Person"  have the
meanings  given  them in the 1940  Act.  Except  as such  term may be  otherwise
defined by the Trustees in conjunction  with the  establishment of any Series of
Shares,  the term "vote of a majority of the Shares  outstanding and entitled to
vote" shall have the same meaning as is assigned to the term "vote of a majority
of the outstanding voting securities" in the 1940 Act.

               (e)  "Custodian"  means any  Person  other than the Trust who has
custody of any Trust  Property as required by Section 17(f) of the 1940 Act, but
does not include a system for the central  handling of  securities  described in
said Section 17(f).

               (f) "Declaration" means this Declaration of Trust as amended from
time to time. Reference in this Declaration of Trust to "Declaration," "hereof,"
"herein," and "hereunder"  shall be deemed to refer to this  Declaration  rather
than exclusively to the article or section in which such words appear.

               (g) "Distributor"  means the party,  other than the Trust, to the
contract described in Section 3.1 hereof.

               (h) "Fund" or "Funds,"  individually or  collectively,  means the
separate Series of Shares of the Trust, together with the assets and liabilities
assigned thereto.

               (i) "Fundamental  Restrictions" means the investment restrictions
set  forth  in the  Prospectus  and  Statement  of  Additional  Information  and
designated as fundamental restrictions therein.


                                       2
<PAGE>

               (j) "His" shall  include the feminine and neuter,  as well as the
masculine, genders.

               (k) "Investment  Adviser" means the party,  other than the Trust,
to the contract described in Section 3.2 hereof.

               (l) The "1940 Act" means the  Investment  Company Act of 1940, as
amended from time to time.

               (m)  "Person"  means  and  includes  individuals,   corporations,
partnerships,  trusts, associations,  joint ventures and other entities, whether
or not legal entities,  and governments and agencies and political  subdivisions
thereof.

               (n) "Prospectus" means the Prospectus and Statement of Additional
Information  included  in the  Registration  Statement  of the  Trust  under the
Securities  Act  of  1933  as  such   Prospectus  and  Statement  of  Additional
Information  may be amended or  supplemented  and filed with the Commission from
time to time.

               (o) "Series"  individually or  collectively  means the separately
managed component(s) of the Trust as may be established and designated from time
to time by the Trustees pursuant to Section 5.11 hereof.

               (p) "Shareholder" means a record owner of Outstanding Shares.

               (q) "Shares" means the equal proportionate units of interest into
which the  beneficial  interest in the Trust shall be divided from time to time,
including the Shares of any and all Series or of any Class within any Series (as
the context may require) which may be established by the Trustees,  and includes
fractions of Shares as well as whole  Shares.  "Outstanding"  Shares means those
Shares shown from time to time on the books of the Trust or its  Transfer  Agent
as then issued and  outstanding,  but shall not include  Shares  which have been
redeemed  or  repurchased  by the  Trust  and  which are at the time held in the
treasury of the Trust.

               (r)  "Transfer  Agent"  means any Person other than the Trust who
maintains  the  Shareholder   records  of  the  Trust,   such  as  the  list  of
Shareholders, the number of Shares credited to each account, and the like.


                                       3
<PAGE>

               (s) "Trust" means Pioneer U.S. Government Trust.

               (t) The  "Trustees"  means  the  persons  who  have  signed  this
Declaration,  so long as they shall  continue in office in  accordance  with the
terms  hereof,  and all other  persons who now serve or may from time to time be
duly  elected,  qualified  and  serving  as  Trustees  in  accordance  with  the
provisions  of  Article  II  hereof,  and  reference  herein to a Trustee or the
Trustees  shall  refer to such  person  or  persons  in this  capacity  or their
capacities as trustees hereunder.

               (u)  "Trust  Property"  means  any  and  all  property,  real  or
personal,  tangible or intangible,  which is owned or held by or for the account
of the Trust or the  Trustees,  including  any and all assets of or allocated to
any Series or Class, as the contest may require.


                                   ARTICLE II

                                    TRUSTEES

     Section 2.1. General Powers. The Trustees shall have exclusive and absolute
control  over the Trust  Property and over the business of the Trust to the same
extent  as if the  Trustees  were the sole  owners  of the  Trust  Property  and
business  in their own  right,  but with such  powers  of  delegation  as may be
permitted  by this  Declaration.  The  Trustees  shall have power to conduct the
business of the Trust and carry on its operations in any and all of its branches
and maintain offices both within and without the Commonwealth of  Massachusetts,
in any and all  states of the  United  States of  America,  in the  District  of
Columbia, and in any and all commonwealths, territories, dependencies, colonies,
possessions,  agencies or  instrumentalities of the United States of America and
of foreign  governments,  and to do all such other  things and  execute all such
instruments as they deem necessary,  proper or desirable in order to promote the
interests  of the  Trust  although  such  things  are  not  herein  specifically
mentioned. Any determination as to what is in the interests of the Trust made by
the Trustees in good faith shall be conclusive.  In construing the provisions of
this  Declaration,  the presumption shall be in favor of a grant of power to the
Trustees.

     The  enumeration  of any  specific  power  herein shall not be construed as
limiting  the  aforesaid  powers.  Such powers of the  Trustees may be exercised
without order of or resort to any court.


                                       4
<PAGE>

     Section 2.2.  Investments.  The Trustees shall have the power:

               (a) To  operate  as and carry on the  business  of an  investment
company, and exercise all the powers necessary and appropriate to the conduct of
such operations.

               (b) To invest in,  hold for  investment,  or reinvest  in,  cash;
securities,   including  common,  preferred  and  preference  stocks;  warrants;
subscription  rights;  profit-sharing  interests or participations and all other
contracts for or evidence of equity interests;  bonds,  debentures,  bills, time
notes and all other  evidences of  indebtedness;  negotiable  or  non-negotiable
instruments;   government   securities,   including  securities  of  any  state,
municipality  or other political  subdivision  thereof,  or any  governmental or
quasi-governmental  agency  or  instrumentality;  and money  market  instruments
including  bank  certificates  of  deposit,  finance  paper,  commercial  paper,
bankers' acceptances and all kinds of repurchase agreements, of any corporation,
company,  trust,  association,  firm  or  other  business  organization  however
established,  and  of  any  country,  state,  municipality  or  other  political
subdivision,    or   any   governmental   or   quasi-governmental    agency   or
instrumentality;  and the Trustees shall be deemed to have the foregoing  powers
with respect to any  additional  securities in which the Trust may invest should
the Fundamental Restrictions be amended.

               (c) To acquire (by purchase, subscription or otherwise), to hold,
to trade in and deal in, to acquire  any rights or options to  purchase or sell,
to sell or otherwise  dispose of, to lend and to pledge any such securities,  to
enter into repurchase agreements, reverse repurchase agreements, firm commitment
agreements and forward foreign currency exchange contracts, to purchase and sell
options on securities,  securities indices, currency and other financial assets,
futures  contracts and options on futures  contracts of all  descriptions and to
engage in all types of hedging and risk-management transactions.

               (d) To exercise all rights, powers and privileges of ownership or
interest  in all  securities  and  repurchase  agreements  included in the Trust
Property,  including  the right to vote thereon and  otherwise  act with respect
thereto and to do all acts for the  preservation,  protection,  improvement  and
enhancement in value of all such securities and repurchase agreements.

               (e) To acquire (by  purchase,  lease or  otherwise)  and to hold,
use, maintain,  develop and dispose of (by sale or otherwise) any property, real
or personal, including cash or foreign currency, and any interest therein.


                                       5
<PAGE>

               (f) To borrow money and in this  connection  issue notes or other
evidence  of  indebtedness;  to secure  borrowings  by  mortgaging,  pledging or
otherwise subjecting as security the Trust Property; and to endorse,  guarantee,
or undertake the performance of any obligation or engagement of any other Person
and to lend Trust Property.

               (g) To aid by further investment any corporation, company, trust,
association  or firm,  any obligation of or interest in which is included in the
Trust  Property  or in the  affairs  of which the  Trustees  have any  direct or
indirect  interest;  to do all acts and things  designed to  protect,  preserve,
improve or enhance the value of such obligation or interest; and to guarantee or
become surety on any or all of the contracts,  stocks, bonds, notes,  debentures
and other obligations of any such corporation,  company,  trust,  association or
firm.

               (h)  To  enter  into a  plan  of  distribution  and  any  related
agreements  whereby the Trust may finance  directly or  indirectly  any activity
which is primarily intended to result in sales of Shares.

               (i) To adopt on  behalf  of the Trust or any  Series  thereof  an
alternative  purchase  plan  providing  for the issuance of multiple  Classes of
Shares (as authorized herein at Section 5.11), such Shares being  differentiated
on the basis of purchase method and allocation of distribution expenses.

               (j) In general to carry on any other business in connection  with
or  incidental  to any of the  foregoing  powers,  to do  everything  necessary,
suitable or proper for the  accomplishment  of any purpose or the  attainment of
any object or the furtherance of any power hereinbefore set forth,  either alone
or in association with others,  and to do every other act or thing incidental or
appurtenant  to or arising out of or connected  with the  aforesaid  business or
purposes, objects or powers.

     The foregoing  clauses shall be construed  both as objects and powers,  and
the  foregoing  enumeration  of  specific  powers  shall not be held to limit or
restrict in any manner the general powers of the Trustees.

     The  Trustees  shall not be limited to investing  in  obligations  maturing
before the possible  termination of the Trust, nor shall the Trustees be limited
by any law limiting the investments which may be made by fiduciaries.


                                       6
<PAGE>

     Section 2.3.  Legal Title.  Legal title to all the Trust  Property shall be
vested in the  Trustees as joint  tenants  except that the  Trustees  shall have
power to cause legal title to any Trust Property to be held by or in the name of
one or more of the  Trustees,  or in the name of the Trust or any  Series of the
Trust,  or in the name of any other  Person  as  nominee,  on such  terms as the
Trustees  may  determine,  provided  that the  interest of the Trust  therein is
deemed appropriately protected. The right, title and interest of the Trustees in
the Trust  Property  and the  Property  of each  Series of the Trust  shall vest
automatically  in each  Person  who may  hereafter  become a  Trustee.  Upon the
termination of the term of office, resignation, removal or death of a Trustee he
shall  automatically  cease to have any right,  title or  interest in any of the
Trust Property,  and the right,  title and interest of such Trustee in the Trust
Property shall vest  automatically in the remaining  Trustees.  Such vesting and
cessation of title shall be effective whether or not conveyancing documents have
been executed and delivered.

     Section 2.4. Issuance and Repurchase of Shares. The Trustees shall have the
power to issue, sell, repurchase, redeem, retire, cancel, acquire, hold, resell,
reissue,  dispose of, transfer, and otherwise deal in Shares and, subject to the
provisions set forth in Articles VI and VII and Section 5.11 hereof, to apply to
any such  repurchase,  redemption,  retirement,  cancellation  or acquisition of
Shares  any funds or  property  of the  Trust,  whether  capital  or  surplus or
otherwise,  to the full  extent now or  hereafter  permitted  by the laws of The
Commonwealth of Massachusetts governing business corporations.

     Section 2.5.  Delegation;  Committees.  The Trustees  shall have the power,
consistent with their continuing  exclusive authority over the management of the
Trust and the Trust  Property,  to  delegate  from time to time to such of their
number or to officers, employees or agents of the Trust the doing of such things
and the  execution  of such  instruments  either in the name of the Trust or any
Series of the Trust or the names of the  Trustees or  otherwise  as the Trustees
may deem  expedient,  to the same extent as such  delegation is permitted by the
1940 Act.

     Section 2.6.  Collection and Payment.  Subject to Section 5.11 hereof,  the
Trustees  shall have the power to collect all property due to the Trust;  to pay
all claims,  including taxes, against the Trust Property; to prosecute,  defend,
compromise or abandon any claims  relating to the Trust  Property;  to foreclose
any security interest securing any obligations,  by virtue of which any property
is  owed  to the  Trust;  and to  enter  into  releases,  agreements  and  other
instruments.


                                       7
<PAGE>

     Section 2.7.  Expenses.  Subject to Section 5.11 hereof, the Trustees shall
have the  power to  incur  and pay any  expenses  which  in the  opinion  of the
Trustees are  necessary or  incidental  to carry out any of the purposes of this
Declaration,  and to pay reasonable  compensation from the funds of the Trust to
themselves as Trustees. The Trustees shall fix the compensation of all officers,
employees and Trustees of the Trust.

     Section 2.8. Manner of Acting; By-laws. Except as otherwise provided herein
or in the  By-laws,  any  action to be taken by the  Trustees  may be taken by a
majority  of the  Trustees  present at a meeting  of  Trustees  (a quorum  being
present),  including any meeting held by means of a conference telephone circuit
or similar communications  equipment by means of which all persons participating
in the meeting can hear each other, or by written  consents of a majority of the
entire  number of Trustees  then in office.  The Trustees may adopt  By-laws not
inconsistent with this Declaration to provide for the conduct of the business of
the Trust and may amend or repeal  such  By-laws to the extent such power is not
reserved to the Shareholders.

     Notwithstanding  the  foregoing  provisions  of  this  Section  2.8  and in
addition to such provisions or any other provision of this Declaration or of the
By-laws,  the Trustees may by resolution appoint a committee  consisting of less
than the  whole  number of  Trustees  then in  office,  which  committee  may be
empowered to act for and bind the Trustees and the Trust, as if the acts of such
committee were the acts of all the Trustees then in office,  with respect to the
institution,  prosecution, dismissal, settlement, review or investigation of any
action,  suit or  proceeding  which shall be pending or threatened to be brought
before any court, administrative agency or other adjudicatory body.

     Section 2.9.  Miscellaneous  Powers.  Subject to Section  5.11 hereof,  the
Trustees  shall have the power to: (a) employ or contract  with such  Persons as
the Trustees may deem desirable for the transaction of the business of the Trust
or any Series thereof; (b) enter into joint ventures, partnerships and any other
combinations or associations; (c) remove Trustees or fill vacancies in or add to
their  number,  elect and remove such  officers and appoint and  terminate  such
agents or employees  as they  consider  appropriate,  and appoint from their own
number, and terminate, any one or more committees which may exercise some or all
of the power and  authority of the Trustees as the Trustees may  determine;  (d)
purchase, and pay for out of Trust Property or Trust Property of the appropriate
Series of the Trust,  insurance  policies insuring the  Shareholders,  Trustees,


                                       8
<PAGE>

officers, employees, agents, investment advisers, administrators,  distributors,
selected  dealers or  independent  contractors  of the Trust  against all claims
arising by reason of holding any such  position or by reason of any action taken
or  omitted by any such  Person in such  capacity,  whether or not  constituting
negligence,  or whether or not the Trust would have the power to indemnify  such
Person against such liability;  (e) establish  pension,  profit  sharing,  share
purchase,  and other  retirement,  incentive and benefit plans for any Trustees,
officers, employees and agents of the Trust; (f) to the extent permitted by law,
indemnify  any person with whom the Trust or any Series  thereof  has  dealings,
including the Investment Adviser, Administrator, Distributor, Transfer Agent and
selected dealers, to such extent as the Trustees shall determine;  (g) guarantee
indebtedness or contractual  obligations of others; (h) determine and change the
fiscal  year of the Trust or any Series  thereof  and the method by which its or
their accounts shall be kept; (i) adopt a seal for the Trust, but the absence of
such seal shall not impair the validity of any instrument  executed on behalf of
the Trust;  and (j) establish record dates relating to meetings of shareholders,
payments of dividends or other distributions, exchanges or conversions of shares
or any other matter deemed appropriate by the Trustees.

     Section 2.10. Principal Transactions.  Except in transactions not permitted
by the 1940 Act or rules and regulations adopted by the Commission, the Trustees
may, on behalf of the Trust,  buy any securities from or sell any securities to,
or lend any assets of the Trust or any Series  thereof to any Trustee or officer
of the Trust or any firm of which any such Trustee or officer is a member acting
as principal, or have any such dealings with the Investment Adviser, Distributor
or Transfer Agent or with any Interested Person of such Person; and the Trust or
a Series  thereof may employ any such  Person,  or firm or company in which such
Person is an Interested Person, as broker,  legal counsel,  registrar,  transfer
agent, dividend disbursing agent or custodian upon customary terms.

     Section 2.11.  Litigation.  The Trustees  shall have the power to engage in
and to prosecute,  defend,  compromise,  abandon,  or adjust by arbitration,  or
otherwise, any actions, sub, proceedings,  disputes, claims and demands relating
to the Trust, and out of the assets of the Trust or any Series thereof to pay or
to satisfy any debts,  claims or  expenses  incurred  in  connection  therewith,
including those of litigation,  and such power shall include without  limitation
the power of the Trustees or any appropriate  committee thereof, in the exercise
of their or its good faith  business  judgment,  to dismiss  any  action,  suit,
proceeding,  dispute, claim or demand,  derivative or otherwise,  brought by any


                                       9
<PAGE>

person,  including  a  Shareholder  in its own  name or the  name of the  Trust,
whether  or not the  Trust  or any of the  Trustees  may be  named  individually
therein or the subject  matter  arises by reason of business for or on behalf of
the Trust.

     Section  2.12.  Number of  Trustees.  The number of Trustees  shall be such
number as shall be fixed from time to time by a written  instrument  signed by a
majority of the Trustees,  provided,  however, that the number of Trustees shall
in no event be less than three (3) nor more than fifteen (15).

     Section 2.13.  Election and Term.  Except for the Trustees  named herein or
appointed to fill  vacancies  pursuant to Section 2.15 hereof,  the Trustees may
succeed  themselves and shall be elected by the Shareholders  owning of record a
plurality of the Shares voting at a meeting of  Shareholders  on a date fixed by
the  Trustees.  Except in the event of  resignations  or  removals  pursuant  to
Section 2.14 hereof, each Trustee shall hold office until such time as less than
a majority of the Trustees holding office have been elected by Shareholders.  In
such event the Trustees  then in office shall call a  Shareholders'  meeting for
the election of Trustees.  Except for the foregoing circumstances,  the Trustees
shall continue to hold office and may appoint successor Trustees.

     Section  2.14.  Resignation  and Removal.  Any Trustee may resign his trust
(without the need for any prior or  subsequent  accounting)  by an instrument in
writing signed by him and delivered to the other  Trustees and such  resignation
shall be effective upon such delivery, or at a later date according to the terms
of the  instrument.  Any of the Trustees may be removed  (provided the aggregate
number of Trustees  after such removal  shall not be less than three) for cause,
by the  action  of  two-thirds  of the  remaining  Trustees  or by action of the
holders of  two-thirds of the  outstanding  Shares of the Trust (for purposes of
determining the circumstances and procedures under which any such removal by the
Shareholders may take place, the provisions of Section 16(c) of the 1940 Act (or
any successor provisions) shall be applicable to the same extent as if the Trust
were subject to the provisions of that Section). Upon the resignation or removal
of a Trustee,  or his  otherwise  ceasing to be a Trustee,  he shall execute and
deliver such  documents as the remaining  Trustees shall require for the purpose
of  memorializing  the conveyance to the Trust or the remaining  Trustees of any
Trust  Property held in the name of the resigning or removed  Trustee.  Upon the
incapacity or death of any Trustee,  his legal  representative shall execute and
deliver on his behalf such documents as the remaining  Trustees shall require as
provided in the preceding sentence.


                                       10
<PAGE>

     Section 2.15.  Vacancies.  The term of office of a Trustee shall  terminate
and a vacancy  shall occur in the event of his death,  retirement,  resignation,
removal, bankruptcy, adjudicated incompetence or other incapacity to perform the
duties of the office of a Trustee.  No such vacancy  shall  operate to annul the
Declaration or to revoke any existing  agency  created  pursuant to the terms of
the  Declaration.  In the  case of an  existing  vacancy,  including  a  vacancy
existing  by reason of an  increase  in the number of  Trustees,  subject to the
provisions of Section 16(a) of the 1940 Act, the remaining  Trustees  shall fill
such vacancy by the appointment of such other person as they in their discretion
shall see fit, made by a written instrument signed by a majority of the Trustees
then in office. Any such appointment shall not become effective,  however, until
the person named in the written instrument of appointment shall have accepted in
writing such  appointment  and agreed in writing to be bound by the terms of the
Declaration.  An  appointment  of a  Trustee  may be made in  anticipation  of a
vacancy  to  occur at a later  date by  reason  of  retirement,  resignation  or
increase in the number of Trustees,  provided  that such  appointment  shall not
become effective prior to such retirement, resignation or increase in the number
of Trustees.  Whenever a vacancy in the number of Trustees  shall  occur,  until
such vacancy is filled as provided in this Section 2.15, the Trustees in office,
regardless  of their number,  shall have all the powers  granted to the Trustees
and shall discharge all the duties imposed upon the Trustees by the Declaration.
A written  instrument  certifying  the  existence  of such  vacancy  signed by a
majority of the Trustees in office shall be conclusive evidence of the existence
of such vacancy.

     Section 2.16.  Delegation of Power to Other  Trustees.  Any Trustee may, by
power of attorney,  delegate his power for a period not exceeding six (6) months
at any one time to any other Trustee or Trustees; provided that in no case shall
fewer than three (3)  Trustees  personally  exercise  the powers  granted to the
Trustees under this Declaration except as herein otherwise expressly provided.


                                  ARTICLE III

                                   CONTRACTS

     Section 3.1.  Underwriting  Contact.  The Trustees may in their  discretion
from time to time enter into an exclusive or non-exclusive distribution contract
or  contracts  providing  for the  sale of the  Shares  to net the  Trust or the


                                       11
<PAGE>

applicable  Series of the Trust not less than the amount provided for in Section
7.1 of Article VII hereof,  whereby the  Trustees  may either  agree to sell the
Shares to the other party to the  contract or appoint  such other party as their
sales agent for the Shares, and in either case on such terms and conditions,  if
any, as may be prescribed in the By-laws,  and such further terms and conditions
as the Trustees may in their  discretion  determine  not  inconsistent  with the
provisions  of this  Article III or of the By-laws;  and such  contract may also
provide  for the  repurchase  of the Shares by such other  party as agent of the
Trustees.

     Section 3.2. Advisory or Management Contract. Subject to approval by a vote
of a majority of Shares  outstanding  and entitled to vote,  the Trustees may in
their discretion from time to time enter into one or more investment advisory or
management  contracts or, if the Trustees  establish  multiple Series,  separate
investment  advisory or management  contracts with respect to one or more Series
whereby  the other  party or parties to any such  contracts  sill  undertake  to
furnish   the   Trust   or  such   Series   management,   investment   advisory,
administration,  accounting,  legal,  statistical  and research  facilities  and
services,  promotional or marketing  activities,  and such other  facilities and
services, if any, as the Trustees shall from time to time consider desirable and
all upon such  terms and  conditions  as the  Trustees  may in their  discretion
determine.  Notwithstanding any provisions of the Declaration,  the Trustees may
authorize the  Investment  Advisers,  or any of them,  under any such  contracts
(subject to such general or specific  instructions as the Trustees may from time
to time adopt) to effect  purchases,  sales,  loans or  exchanges  of  portfolio
securities  and other  investments of the Trust on behalf of the Trustees or may
authorize  any  officer,  employee or Trustee to effect such  purchases,  sales,
loans or exchanges pursuant to recommendations of such Investment  Advisers,  or
any of  them  (and  all  without  further  action  by the  Trustees).  Any  such
purchases, sales, loans and exchanges shall be deemed to have been authorized by
all of the Trustees. The Trustees may, in their sole discretion,  call a meeting
of Shareholders in order to submit to a vote of Shareholders at such meeting the
approval or continuance of any such investment advisory or management  contract.
If the Shareholders of any one or more of the Series of the Trust should fail to
approve any such  investment  advisory or management  contract,  the  Investment
Adviser may nonetheless  serve as Investment  Adviser with respect to any Series
whose Shareholders approve such contract.



                                       12
<PAGE>

     Section 3.3. Administration Agreement. The Trustees may in their discretion
from time to time enter into an  administration  agreement  or, if the  Trustees
establish multiple Series or Classes,  separate  administration  agreements with
respect to each Series or Class, whereby the other party to such agreement shall
undertake  to manage the  business  affairs of the Trust or of a Series or Class
thereof furnish the Trust or a Series or a Class thereof with office facilities,
and  shall  be  responsible   for  the  ordinary   clerical,   bookkeeping   and
recordkeeping  services  at such office  facilities,  and other  facilities  and
services,  if any, and all upon such terms and conditions as the Trustees may in
their discretion determine.

     Section 3.4. Service  Agreement.  The Trustees may in their discretion from
time to time enter into Service Agreements with respect to one or more Series or
Classes of Shares  whereby the other  parties to such  Service  Agreements  will
provide  administration and/or support services pursuant to Administration Plans
and Service  Plans,  and all upon such terms and  conditions  as the Trustees in
their discretion may determine.

     Section 3.5. Transfer Agent. The Trustees may in their discretion from time
to time enter into a transfer agency and shareholder  service  contract  whereby
the other party to such contract shall undertake to furnish  transfer agency and
shareholder  services  to the  Trust.  The  contract  shall  have such terms and
conditions as the Trustees may in their  discretion deem not  inconsistent  with
the Declaration. Such services may be provided by one or more Persons.

     Section 3.6. Custodian. The Trustees may appoint or otherwise engage one or
more banks or trust  companies,  each having an aggregate  capital,  surplus and
undivided  profits  (as  shown in its last  published  report)  of at least  two
million dollars  ($2,000,000) to serve as Custodian with authority as its agent,
but subject to such restrictions, limitations and other requirements, if any, as
may be  contained in the By-Laws of the Trust.  The Trustees may also  authorize
the Custodian to employ one or more sub-custodians, including such foreign banks
and securities depositories as meet the requirements of applicable provisions of
the 1940 Act, and upon such terms and  conditions  as may be agreed upon between
the Custodian and such sub-custodian, to hold securities and other assets of the
Trust  and to  perform  the acts  and  services  of the  Custodian,  subject  to
applicable provisions of law and resolutions adopted by the Trustees.

     Section 3.7.  Affiliations of Trustees or Officers, Etc.  The fact that:



                                       13
<PAGE>

              (i) any of the Shareholders,  Trustees or officers of the Trust or
     any Series thereof is a shareholder,  director,  officer, partner, trustee,
     employee,  manager,  adviser  or  distributor  of or for  any  partnership,
     corporation,  trust,  association  or other  organization  or of or for any
     parent or  affiliate  of any  organization,  with which a  contract  of the
     character  described in Sections 3.1, 3.2, 3.3 or 3.4 above or for services
     as Custodian,  Transfer Agent or disbursing  agent or for related  services
     may have been or may hereafter be made, or that any such  organization,  or
     any parent or affiliate thereof,  is a Shareholder of or has an interest in
     the Trust, or that

              (ii) any  partnership,  corporation,  trust,  association or other
     organization  with which a contract of the character  described in Sections
     3.1, 3.2, 3.3 or 3.4 above or for services as Custodian,  Transfer Agent or
     disbursing  agent or for related services may have been or may hereafter be
     made  also has any one or more of such  contracts  with  one or more  other
     partnerships, corporations, trusts, associations or other organizations, or
     has other business or interests,  shall not affect the validity of any such
     contract or  disqualify  any  Shareholder,  Trustee or officer of the Trust
     from  voting  upon  or  executing  the  same or  create  any  liability  or
     accountability to the Trust or its Shareholders.

     Section 3.8.  Compliance with 1940 Act. Any contract  entered into pursuant
to Sections 3.1 or 3.2 shall be consistent with and subject to the  requirements
of  Section  15 of the  1940  Act  (including  any  amendment  thereof  or other
applicable  Act of Congress  hereafter  enacted),  as modified by any applicable
order or orders of the  Commission,  with respect to its  continuance in effect,
its termination and the method of authorization and approval of such contract or
renewal thereof.


                                   ARTICLE IV

                   LIMITATIONS OF LIABILITY OF SHAREHOLDERS,
                              TRUSTEES AND OTHERS

     Section  4.1. No Personal  Liability  of  Shareholders,  Trustees,  Etc. No
Shareholder shall be subject to any personal liability  whatsoever to any Person
in connection  with Trust  Property or the acts,  obligations  or affairs of the


                                       14
<PAGE>

Trust or any Series thereof. No Trustee, officer, employee or agent of the Trust
or any Series thereof shall be subject to any personal  liability  whatsoever to
any Person,  other than to the Trust or its  Shareholders,  in  connection  with
Trust  Property or the affairs of the Trust,  except to the extent  arising from
bad faith,  willful  misfeasance,  gross negligence or reckless disregard of his
duties with  respect to such Person;  and all such Persons  shall look solely to
the Trust  Property,  or to the Property of one or more  specific  Series of the
Trust if the claim arises from the conduct of such Trustee, officer, employee or
agent with respect to only such Series, for satisfaction of claims of any nature
arising  in  connection  with the  affairs  of the  Trust.  If any  Shareholder,
Trustee,  officer,  employee,  or agent,  as such,  of the  Trust or any  Series
thereof, is made a party to any suit or proceeding to enforce any such liability
of the Trust or any Series thereof, he shall not, on account thereof, be held to
any personal  liability.  The Trust shall  indemnify  and hold each  Shareholder
harmless from and against all claims and liabilities,  to which such Shareholder
may become  subject  by reason of his being or having  been a  Shareholder,  and
shall  reimburse such  Shareholder or former  Shareholder  (or his or her heirs,
executors,  administrators  or other legal  representatives  or in the case of a
corporation  or other entity,  its corporate or other general  successor) out of
the Trust Property for all legal and other expenses  reasonably  incurred by him
in  connection  with  any such  claim  or  liability.  The  indemnification  and
reimbursement  required  by the  preceding  sentence  shall be made  only out of
assets of the one or more Series whose Shares were held by said  Shareholder  at
the time the act or event  occurred  which  gave  rise to the claim  against  or
liability of said  Shareholder.  The rights accruing to a Shareholder under this
Section  4.1 shall not impair any other right to which such  Shareholder  may be
lawfully entitled, nor shall anything herein contained restrict the right of the
Trust or any Series  thereof to  indemnify  or  reimburse a  Shareholder  in any
appropriate situation even though not specifically provided herein.

     Section 4.2. Non-Liability of Trustees, Etc. No Trustee,  officer, employee
or agent of the Trust or any Series  thereof  shall be liable to the Trust,  its
Shareholders,  or to any  Shareholder,  Trustee,  officer,  employee,  or  agent
thereof  for any action or  failure to act  (including  without  limitation  the
failure to compel in any way any former or acting  Trustee to redress any breach
of trust) except for his own bad faith, willful misfeasance, grass negligence or
reckless disregard of the duties involved in the conduct of his office.

     Section 4.3. Mandatory  Indemnification.  (a) Subject to the exceptions and
limitations contained in paragraph (b) below:


                                       15
<PAGE>

               (i)  every  person  who is,  or has  been,  a  Trustee,  officer,
          employee or agent of the Trust (including any individual who serves at
          its  request as  director,  officer,  partner,  trustee or the like of
          another  organization  in which it has any interest as a  shareholder,
          creditor or otherwise) shall be indemnified by the Trust, or by one or
          more Series  thereof if the claim  arises from his or her conduct with
          respect to only such Series,  to the fullest  extent  permitted by law
          against all liability and against all expenses  reasonably incurred or
          paid by him in connection with any claim,  action,  suit or proceeding
          in which he becomes  involved as a party or otherwise by virtue of his
          being or having been a Trustee or officer and against  amounts paid or
          incurred by him in the settlement thereof;

               (ii) the words "claim,"  "action," "suit," or "proceeding"  shall
          apply to all claims,  actions, suits or proceedings (civil,  criminal,
          or other,  including  appeals),  actual or  threatened;  and the words
          "liability"  and  "expenses"   shall  include,   without   limitation,
          attorneys' fees, costs, judgments, amounts paid in settlement,  fines,
          penalties and other liabilities.

                    (b) No  indemnification  shall be  provided  hereunder  to a
               Trustee or officer:

               (i) against any liability to the Trust,  a Series  thereof or the
          Shareholders  by reason  of  willful  misfeasance,  bad  faith,  gross
          negligence or reckless disregard of the duties involved in the conduct
          of his office;

               (ii) with  respect  to any  matter as to which he shall have been
          finally  adjudicated not to have acted in good faith in the reasonable
          belief  that his  action  was in the best  interest  of the Trust or a
          Series thereof;

               (iii) in the  event of a  settlement  or  other  disposition  not
          involving  a final  adjudication  as  provided  in  paragraph  (b)(ii)
          resulting in a payment by a Trustee or officer,  unless there has been
          a determination that such Trustee or officer did not engage in willful
          misfeasance,  bad faith, gross negligence or reckless disregard of the
          duties involved in the conduct of his office:


                                       16
<PAGE>

                         (A) by the court or other body approving the settlement
                    or other disposition;

                         (B) based upon a review of readily  available facts (as
                    opposed  to a full  trial-type  inquiry)  by (x)  vote  of a
                    majority of the Non-interested Trustees acting on the matter
                    (provided  that a majority  of the  Non-interested  Trustees
                    then in office act on the matter) or (y) written  opinion of
                    independent legal counsel; or

                         (C) by a vote of a majority  of the Shares  outstanding
                    and  entitled to vote  (excluding  Shares owned of record or
                    beneficially by such individual).

                    (c) The rights of  indemnification  herein  provided  may be
               insured  against by policies  maintained  by the Trust,  shall be
               severable, shall not affect any other rights to which any Trustee
               or officer may now or hereafter be entitled, shall continue as to
               a person who has ceased to be such  Trustee or officer  and shall
               inure to the benefit of the heirs, executors,  administrators and
               assigns of such a person.  Nothing  contained herein shall affect
               any rights to  indemnification to which personnel of the Trust or
               any  Series  thereof  other than  Trustees  and  officers  may be
               entitled by contract or otherwise under law.

                    (d) Expenses of preparation and presentation of a defense to
               any claim,  action, suit or proceeding of the character described
               in paragraph (a) of this Section 4.3 may be advanced by the Trust
               or a  Series  thereof  prior to final  disposition  thereof  upon
               receipt of an  undertaking  by or on behalf of the  recipient  to
               repay such amount if it is ultimately  determined  that he is not
               entitled to indemnification under this Section 4.3, provided that
               either:

               (i) such  undertaking  is secured by a surety  bond or some other
          appropriate security provided by the recipient, or the Trust or Series
          thereof  shall  be  insured  against  losses  arising  out of any such
          advances; or



                                       17
<PAGE>

               (ii) a  majority  of the  Non-interested  Trustees  acting on the
          matter (provided that a majority of the Non-interested Trustees act on
          the matter) or an independent legal counsel in a written opinion shall
          determine,  based upon a review of readily available facts (as opposed
          to a full  trial-type  inquiry),  that there is reason to believe that
          the recipient ultimately will be found entitled to indemnification.

     As used in this Section 4.3, a  "Non-interested  Trustee" is one who (i) is
not an "Interested  Person" of the Trust (including anyone who has been exempted
from  being an  "Interested  Person"  by any  rule,  regulation  or order of the
Commission), and (ii) is not involved in the claim, action, suit or proceeding.

     Section 4.4. No Bond Required & Trustees.  No Trustee shall be obligated to
give  any  bond or  other  security  for the  performance  of any of his  duties
hereunder.

     Section 4.5. No Duty of Investigation; Notice in Trust Instruments, Etc. No
purchaser,  lender,  transfer agent or other Person dealing with the Trustees or
any officer,  employee or agent of the Trust or a Series  thereof shall be bound
to make any inquiry concerning the validity of any transaction  purporting to be
made by the Trustees or by said officer,  employee or agent or be liable for the
application of money or property paid,  loaned,  or delivered to or on the order
of the  Trustees  or of said  officer,  employee  or  agent.  Every  obligation,
contract,  instrument,  certificate,  Share,  other  security  of the Trust or a
Series thereof or undertaking,  and every other act or thing whatsoever executed
in  connection  with the  Trust  shall be  conclusively  presumed  to have  been
executed or done by the  executors  thereof  only in their  capacity as Trustees
under this Declaration or in their capacity as officers,  employees or agents of
the Trust or a Series thereof. Every written obligation,  contract,  instrument,
certificate,  Share,  other  security  of  the  Trust  or a  Series  thereof  or
undertaking  made or issued by the Trustees may recite that the same is executed
or made by them not  individually,  but as Trustees under the  Declaration,  and
that the  obligations of the Trust or a Series thereof under any such instrument
are not binding upon any of the Trustees or Shareholders individually,  but bind
only the Trust Property or the Trust Property of the applicable  Series, and may
contain any further recital which they may deem appropriate, but the omission of
such recital shall not operate to bind the Trustees  individually.  The Trustees
shall at all times  maintain  insurance for the protection of the Trust Property
or the Trust  Property of the applicable  Series,  its  Shareholders,  Trustees,


                                       18
<PAGE>

officers,  employees  and  agents in such  amount  as the  Trustees  shall  deem
adequate to cover  possible  tort  liability,  and such other  insurance  as the
Trustees in their sole judgment shall deem advisable.

     Section 4.6. Reliance on Experts, Etc. Each Trustee, officer or employee of
the Trust or a Series thereof shall, in the performance of his duties,  be fully
and completely  justified and protected with regard to any act or any failure to
act  resulting  from  reliance  in good faith upon the books of account or other
records of the Trust or a Series  thereof,  upon an opinion of counsel,  or upon
reports  made  to the  Trust  or a  Series  thereof  by any of its  officers  or
employees or by the Investment  Adviser,  the  Administrator,  the  Distributor,
Transfer Agent,  selected dealers,  accountants,  appraisers or other experts or
consultants selected with reasonable care by the Trustees, officers or employees
of the  Trust,  regardless  of  whether  such  counsel  or expert  may also be a
Trustee.


                                   ARTICLE V

                         SHARES OF BENEFICIAL INTEREST

     Section  5.1.  Beneficial  Interest.  The  interest  of  the  beneficiaries
hereunder  shall be divided  into  transferable  Shares of  beneficial  interest
without par value. The number of such Shares of beneficial  interest  authorized
hereunder is unlimited.  The Trustees shall have the exclusive authority without
the  requirement of Shareholder  approval to establish and designate one or more
Series of shares and one or more Classes  thereof as the Trustees deem necessary
or desirable.  Each share of any Series shall  represent an equal  proportionate
Share in the assets of that Series with each other Share in that Series. Subject
to the  provisions of Section 5.11 hereof,  the Trustees may also  authorize the
creation of  additional  Series of Shares (the proceeds of which may be invested
in separate,  independently managed portfolios) and additional Classes of Shares
within any Series. All Shares issued hereunder  including,  without  limitation,
Shares  issued in  connection  with a  dividend  in Shares or a split in Shares,
shall be fully paid and nonassessable by the Trust.

     Section 5.2. Rights of Shareholders. The ownership of the Trust Property of
every description and the right to conduct any business  hereinbefore  described
are vested  exclusively  in the  Trustees,  and the  Shareholders  shall have no
interest therein other than the beneficial  interest  conferred by their Shares,
and  they  shall  have no right to call for any  partition  or  division  of any


                                       19
<PAGE>

property,  profits, rights or interests of the Trust nor can they be called upon
to share or assume any losses of the Trust or suffer an  assessment  of any kind
by virtue of their  ownership of Shares.  The Shares shall be personal  property
giving only the rights  specifically set forth in this  Declaration.  The Shares
shall not entitle the holder to preference, preemptive, appraisal, conversion or
exchange rights, except as the Trustees may determine with respect to any Series
or Class of Shares.

     Section 5.3. Trust Only. It is the intention of the Trustees to create only
the  relationship  of Trustee  and  beneficiary  between the  Trustees  and each
Shareholder from time to time. It is not the intention of the Trustees to create
a  general   partnership,   limited   partnership,   joint  stock   association,
corporation,  bailment  or any form of legal  relationship  other  than a trust.
Nothing  in  this   Declaration   of  Trust  shall  be  construed  to  make  the
Shareholders,  either by themselves or with the Trustees, partners or members of
a joint stock association.

     Section 5.4. Issuance of Shares. The Trustees in their discretion may, from
time to time without vote of the Shareholders,  issue Shares, in addition to the
then  issued and  outstanding  Shares and Shares held in the  treasury,  to such
party or parties and for such amount and type of  consideration,  including cash
or  property,  at such time or times and on such terms as the  Trustees may deem
best,  except that only Shares  previously  contracted  to be sold may be issued
during any period when the right of redemption is suspended  pursuant to Section
6.9  hereof,  and  may in  such  manner  acquire  other  assets  (including  the
acquisition  of assets  subject to, and in connection  with the  assumption  of,
liabilities)  and  businesses.  In connection  with any issuance of Shares,  the
Trustees  may issue  fractional  Shares and  Shares  held in the  treasury.  The
Trustees  may from time to time divide or combine the Shares of the Trust or, if
the Shares be divided into Series or Classes, of any Series or any Class thereof
of the Trust,  into a greater or lesser  number  without  thereby  changing  the
proportionate  beneficial  interests  in  the  Trust  or in the  Trust  Property
allocated or belonging  to such Series or Class.  Contributions  to the Trust or
Series  thereof may be accepted  for,  and Shares  shall be redeemed  as,  whole
Shares and/or 1/1,000ths of a Share or integral multiples thereof.

     Section 5.5.  Register of Shares. A register shall be kept at the principal
office of the Trust or an office of the Transfer  Agent which shall  contain the
names and  addresses of the  Shareholders  and the number of Shares held by them


                                       20
<PAGE>

respectively  and a record of all  transfers  thereof.  Such  register  shall be
conclusive  as to who are the holders of the Shares and who shall be entitled to
receive  dividends or distributions or otherwise to exercise or enjoy the rights
of  Shareholders.  No  Shareholder  shall be entitled to receive  payment of any
dividend or distribution,  nor to have notice given to him as provided herein or
in the  By-laws,  until he has given his address to the  Transfer  Agent or such
other officer or agent of the Trustees as shall keep the said register for entry
thereon. It is not contemplated that certificates will be issued for the Shares;
however, the Trustees, in their discretion,  may authorize the issuance of share
certificates and promulgate appropriate rules and regulations as to their use.

     Section  5.6.  Transfer  of Shares.  Shares  shall be  transferable  on the
records of the Trust only by the record holder thereof or by his agent thereunto
duly authorized in writing,  upon delivery to the Trustees or the Transfer Agent
of a duly executed  instrument  of transfer,  together with such evidence of the
genuineness of each such execution and authorization and of other matters as may
reasonably be required. Upon such delivery the transfer shall be recorded on the
register of the Trust.  Until such  record is made,  the  Shareholder  of record
shall be deemed to be the holder of such Shares for all purposes  hereunder  and
neither the  Trustees  nor any  transfer  agent or  registrar  nor any  officer,
employee or agent of the Trust  shall be affected by any notice of the  proposed
transfer.

     Any person  becoming  entitled to any Shares in  consequence  of the death,
bankruptcy or incompetence of any Shareholder, or otherwise by operation of law,
shall be  recorded  on the  register of Shares as the holder of such Shares upon
production of the proper evidence thereof to the Trustees or the Transfer Agent,
but until such record is made,  the  Shareholder of record shall be deemed to be
the holder of such Shares for all  purposes  hereunder  and neither the Trustees
nor any Transfer  Agent or registrar nor any officer or agent of the Trust shall
be affected by any notice of such death,  bankruptcy or  incompetence,  or other
operation of law.

     Section 5.7.  Notices.  Any and all notices to which any Shareholder may be
entitled and any and all communications  shall be deemed duly served or given if
mailed,  postage  prepaid,  addressed to any  Shareholder  of record at his last
known address as recorded on the register of the Trust.

     Section 5.8.  Treasury  Shares.  Shares held in the treasury  shall,  until


                                       21
<PAGE>

resold  pursuant to Section 5.4, not confer any voting  rights on the  Trustees,
nor shall  such  Shares be  entitled  to any  dividends  or other  distributions
declared with respect to the Shares.

     Section 5.9. Voting Powers.  The Shareholders shall have power to vote only
(i) for the election of Trustees as provided in Section 2.13;  (ii) with respect
to any investment  advisory contract entered into pursuant to Section 3.2; (iii)
with  respect  to  termination  of the  Trust or a Series  or Class  thereof  as
provided in Section 8.2; (iv) with respect to any amendment of this  Declaration
to the extent and as provided in Section  8.3;  (v) with  respect to any merger,
consolidation or sale of assets as provided in Section 8.4; (vi) with respect to
incorporation  of the Trust to the extent and as provided in Section 8.5;  (vii)
to the same extent as the stockholders of a Massachusetts  business  corporation
as to whether or not a court action, proceeding or claim should or should not be
brought or maintained  derivatively  or as a class action on behalf of the Trust
or a Series thereof or the  Shareholders  of either;  (viii) with respect to any
plan adopted  pursuant to Rule 12b-1 (or any successor rule) under the 1940 Act,
and related  matters,  to the extent  required under the 1940 Act; and (ix) with
respect to such additional  matters  relating to the Trust as may be required by
this Declaration,  the By-laws or any registration of the Trust as an investment
company under the 1940 Act with the Commission  (or any successor  agency) or as
the  Trustees may consider  necessary  or  desirable.  Each whole Share shall be
entitled  to one vote as to any matter on which it is  entitled to vote and each
fractional  Share shall be entitled to a proportionate  fractional  vote. On any
matter  submitted  to a vote of  Shareholders,  all  Shares  shall  be  voted by
individual  Series  except (1) when  permitted by the 1940 Act,  Shares shall be
voted in the aggregate and not by individual  Series;  and (2) when the Trustees
have determined that the matter affects only the interests of one or more Series
or Class  thereof,  then only the  Shareholders  of such Series or Class thereof
shall be entitled to vote  thereon.  The Trustees may, in  conjunction  with the
establishment  of  any  further  Series  or any  Classes  of  Shares,  establish
conditions  under  which the  several  Series or  Classes  of Shares  shall have
separate voting rights or no voting rights.  There shall be no cumulative voting
in the election of Trustees.  Until Shares are issued, the Trustees may exercise
all  rights  of  Shareholders  and may take any  action  required  by law,  this
Declaration or the By-laws to be taken by Shareholders.  The By-laws may include
further provisions for Shareholders' votes and meetings and related matters.

     Section 5.10.  Meetings of  Shareholders.  No annual or regular meetings of
Shareholders  are  required.  Special  meetings of the  Shareholders,  including


                                       22
<PAGE>

meetings  involving  only the holders of Shares of one or more but less than all
Series or  Classes  thereof,  may be called at any time by the  Chairman  of the
Board, President, or any Vice President of the Trust, and shall be called by the
President or the  Secretary at the request,  in writing or by  resolution,  of a
majority of the Trustees,  or at the written request of the holder or holders of
ten  percent  (10%) or more of the  total  number  of  Shares  then  issued  and
outstanding  of the Trust  entitled  to vote at such  meeting.  Meetings  of the
Shareholders  of any Series of the Trust shall be called by the President or the
Secretary at the written  request of the holder or holders of ten percent  (10%)
or more of the total number of Shares then issued and outstanding of such Series
of the Trust entitled to vote at such meeting.  Any such request shall state the
purpose of the proposed meeting.

     Section 5.11.  Series or Class Designation.

          (a)  Without  limiting  the  authority  of the  Trustees  set forth in
     Section 5.1 to establish  and designate  any further  Series,  it is hereby
     confirmed  that the Trust consists of the presently  Outstanding  Shares of
     one Series: Pioneer U.S. Government Trust (the "Existing Series").

          (b)  Without  limiting  the  authority  of the  Trustees  set forth in
     Section 5.1 to establish and designate  any further  Classes,  it is hereby
     confirmed  that each  Series of the  Trust's  Shares  consists  of a single
     Class.

          (c) The Shares of the Existing  Series and each Class  thereof  herein
     established and designated and any Shares of any further Series and Classes
     that may from time to time be  established  and  designated by the Trustees
     shall be  established  and  designated,  and the variations in the relative
     rights and  preferences as between the different  Series shall be fixed and
     determined,  by the Trustees (unless the Trustees otherwise  determine with
     respect  to  further  Series or  Classes  at the time of  establishing  and
     designating the same); provided,  that all Shares shall be identical except
     that there may be  variations  so fixed and  determined  between  different
     Series  or  Classes  thereof  as  to  investment  objective,  policies  and
     restrictions,  purchase price, payment obligations,  distribution expenses,
     right of  redemption,  special and relative  rights as to dividends  and on
     liquidation, conversion rights, exchange rights, and conditions under which
     the several  Series shall have  separate  voting  rights,  all of which are
     subject to the  limitations  set forth below.  All  references to Shares in
     this  Declaration  shall be deemed  to be  Shares  of any or all  Series or
     Classes as the context may require.


                                       23
<PAGE>

          (d) As to any existing Series and Classes,  both heretofore and herein
     established and designated, and any further division of Shares of the Trust
     into  additional  Series or  Classes,  the  following  provisions  shall be
     applicable:

               (i) The number of  authorized  Shares and the number of Shares of
          each Series or Class  thereof that may be issued  shall be  unlimited.
          The  Trustees may classify or  reclassify  any unissued  Shares or any
          Shares  previously  issued and  reacquired of any Series or Class into
          one or more Series or one or more Classes that may be established  and
          designated from time to time. The Trustees may hold as treasury shares
          (of the  same  or some  other  Series  or  Class),  reissue  for  such
          consideration  and on such terms as they may determine,  or cancel any
          Shares  of any  Series  or  Class  reacquired  by the  Trust  at their
          discretion from time to time.

               (ii) All  consideration  received  by the  Trust for the issue or
          sale of Shares of a  particular  Series  or Class,  together  with all
          assets in which such  consideration  is  invested or  reinvested,  all
          income, earnings, profits and proceeds thereof, including any proceeds
          derived from the sale, exchange or liquidation of such assets, and any
          funds or payments  derived from any  reinvestment  of such proceeds in
          whatever form the same may be, shall irrevocably belong to that Series
          for all  purposes,  subject  only to the rights of  creditors  of such
          Series and except as may otherwise be required by applicable tax laws,
          and shall be so  recorded  upon the books of account of the Trust.  In
          the event that there are any  assets,  income,  earnings,  profits and
          proceeds thereof, funds or payments which are not readily identifiable
          as belonging to any  particular  Series,  the Trustees  shall allocate
          them among any one or more of the Series  established  and  designated
          from time to time in such  manner and on such basis as they,  in their
          sole discretion,  deem fair and equitable. Each such allocation by the
          Trustees shall be conclusive and binding upon the  Shareholders of all
          Series for all purposes.  No holder of Shares of any Series shall have
          any claim on or right to any  assets  allocated  or  belonging  to any
          other Series.

               (iii) The assets  belonging  to each  particular  Series shall be
          charged with the liabilities of the Trust in respect of that Series or


                                       24
<PAGE>

          the  appropriate  Class or Classes  thereof and all  expenses,  costs,
          charges and reserves  attributable  to that Series or Class or Classes
          thereof,  and any general  liabilities,  expenses,  costs,  charges or
          reserves of the Trust which are not readily  identifiable as belonging
          to any  particular  Series  shall  be  allocated  and  charged  by the
          Trustees  to and among any one or more of the Series  established  and
          designated  from time to time in such  manner and on such basis as the
          Trustees  in their  sole  discretion  deem  fair and  equitable.  Each
          allocation of liabilities,  expenses,  costs,  charges and reserves by
          the Trustees shall be conclusive and binding upon the  Shareholders of
          all Series and Classes for all purposes.  The Trustees shall have full
          discretion,  to the  extent  not  inconsistent  with the 1940 Act,  to
          determine  which items are capital;  and each such  determination  and
          allocation shall be conclusive and binding upon the Shareholders.  The
          assets  of  a  particular   Series  of  the  Trust  shall,   under  no
          circumstances,  be charged with liabilities  attributable to any other
          Series or Class thereof of the Trust. All persons extending credit to,
          or contracting with or having any claim against a particular Series or
          Class of the Trust  shall look only to the  assets of that  particular
          Series for payment of such credit, contract or claim.

               (iv)  The  power  of the  Trustees  to  pay  dividends  and  make
          distributions  shall be governed  by Section  7.2 of this  Declaration
          with respect to any Series or Classes which represent the interests in
          the assets of the Trust  immediately prior to the establishment of two
          or more Series or Classes.  With respect to any other Series or Class,
          dividends and  distributions on Shares of a particular Series or Class
          may be paid with such frequency as the Trustees may  determine,  which
          may be  daily or  otherwise,  pursuant  to a  standing  resolution  or
          resolutions  adopted only once or with such  frequency as the Trustees
          may determine,  to the holders of Shares of that Series or Class, from
          such of the income and capital  gains,  accrued or realized,  from the
          assets belonging to that Series,  a the Trustees may determine,  after
          providing for actual and accrued liabilities  belonging to that Series
          or Class.  All dividends and  distributions  on Shares of a particular
          Series or Class shall be distributed  pro rata to the  Shareholders of
          that  Series or Class in  proportion  to the  number of Shares of that
          Series  or  Class  held by such  Shareholders  at the  time of  record
          established for the payment of such dividends or distribution.


                                       25
<PAGE>

               (v)  Each  Share of a  Series  of the  Trust  shall  represent  a
          beneficial  interest in the net assets of such Series.  Each holder of
          Shares of a Series or Class  thereof  shall be entitled to receive his
          pro rata share of  distributions of income and capital gains made with
          respect to such Series or Class net of expenses.  Upon  redemption  of
          his Shares or  indemnification  for liabilities  incurred by reason of
          his  being or having  been a  Shareholder  of a Series or Class,  such
          Shareholder shall be paid solely out of the funds and property of such
          Series of the Trust.  Upon  liquidation  or termination of a Series or
          Class  thereof  of the  Trust,  Shareholders  of such  Series or Class
          thereof  shall be  entitled  to  receive  a pro rata  share of the net
          assets of such Series.  A  Shareholder  of a particular  Series of the
          Trust shall not be entitled to  participate  in a derivative  or class
          action on behalf of any other Series or the  Shareholders of any other
          Series of the Trust.

               (vi) On each  matter  submitted  to a vote of  Shareholders,  all
          Shares  of all  Series  and  Classes  shall  vote as a  single  class;
          provided,  however,  that (1) as to any matter with respect to which a
          separate vote of any Series or Class is required by the 1940 Act or is
          required  by  attributes  applicable  to any  Series  or  Class  or is
          required by any Rule 12b-1 plan,  such  requirements  as to a separate
          vote by that  Series or Class  shall  apply;  (2) to the extent that a
          matter  referred to in clause (1) above affects more than one Class or
          Series  and the  interests  of each such Class or Series in the matter
          are identical,  then,  subject to clause (3) below,  the Shares of all
          such affected  Classes or Series shall vote as a single Class;  (3) as
          to any matter  which does not affect  the  interests  of a  particular
          Series  or  Class,  only  the  holders  of  Shares  of the one or more
          affected  Series or Classes  shall be  entitled  to vote;  and (4) the
          provisions of the following  sentence shall apply.  On any matter that
          pertains  to any  particular  Class of a  particular  Series or to any
          Class  expenses  with  respect  to  any  Series  which  matter  may be
          submitted to a vote of Shareholders, only Shares of the affected Class
          or that  Series,  as the case may be, shall be entitled to vote except
          that: (x) to the extent said matter affects Shares of another Class or
          Series,  such other Shares shall also be entitled to vote, and in such
          cases Shares of the affected Class, as the case may be, of such Series
          shall be voted in the aggregate  together with such other Shares;  and


                                       26
<PAGE>

          (y) to the  extent  that  said  matter  does not  affect  Shares  of a
          particular Class of such Series,  said Shares shall not be entitled to
          vote  (except  where  otherwise  required by law or  permitted  by the
          Trustees  acting in their sole  discretion)  even though the matter is
          submitted to a vote of the Shareholders of any other Class or Series.

               (vii)  Except  as  otherwise  provided  in this  Article  V,  the
          Trustees   shall  have  the  power  to  determine  the   designations,
          preferences,  privileges, payment obligations, limitations and rights,
          including  voting  and  dividend  rights,  of each Class and Series of
          Shares.  Subject to compliance with the  requirements of the 1940 Act,
          the Trustees  shall have the  authority to provide that the holders of
          Shares of any  Series or Class  shall  have the  right to  convert  or
          exchange  said  Shares into Shares of one or more Series or Classes of
          Shares in accordance with such requirements, conditions and procedures
          as may be established by the Trustees.

               (viii) The establishment and designation of any Series or Classes
          of Shares shall be effective  upon the  execution by a majority of the
          then Trustees of an instrument  setting forth such  establishment  and
          designation  and the relative rights and preferences of such Series or
          Classes, or as otherwise provided in such instrument. At any time that
          there  are no Shares  outstanding  of any  particular  Series or Class
          previously  established  and  designated,   the  Trustees  may  by  an
          instrument  executed by a majority of their number abolish that Series
          or  Class  and  the  establishment  and  designation   thereof.   Each
          instrument  referred  to in this  section  shall have the status of an
          amendment to this Declaration.

     Section 5.12. Assent to Declaration of Trust. Every Shareholder,  by virtue
of having become a  Shareholder,  shall be held to have  expressly  assented and
agreed to the terms hereof and to have become a party hereto.


                                   ARTICLE VI

                      REDEMPTION AND REPURCHASE OF SHARES

     Section  6.1.  Redemption  of Shares.  (a) All Shares of the Trust shall be


                                       27
<PAGE>

redeemable,  at the  redemption  price  determined in the manner set out in this
Declaration.  Redeemed  or  repurchased  Shares may be resold by the Trust.  The
Trust may  require  any  Shareholder  to pay a sales  charge to the  Trust,  the
underwriter,  or any other person  designated by the Trustees upon redemption or
repurchase  of  Shares  in such  amount  and upon  such  conditions  as shall be
determined from time to time by the Trustees.

              (b) The Trust  shall  redeem the Shares of the Trust or any Series
     or Class thereof at the price determined as hereinafter set forth, upon the
     appropriately verified written application of the record holder thereof (or
     upon such  other form of request as the  Trustees  may  determine)  at such
     office or agency as may be designated from time to time for that purpose by
     the  Trustees.  The  Trustees  may  from  time to time  specify  additional
     conditions, not inconsistent with the 1940 Act, regarding the redemption of
     Shares in the Trust's then effective Prospectus.

     Section 6.2. Price.  Shares shall be redeemed at a price based on their net
asset value  determined a set forth in Section 7.1 hereof as of such time as the
Trustees shall have theretofore prescribed by resolution. In the absence of such
resolution,  the redemption  price of Shares deposited shall be based on the net
asset value of such Shares  next  determined  as set forth in Section 7.1 hereof
after receipt of such application.  The amount of any contingent  deferred sales
charge or redemption fee payable upon  redemption of Shares may be deducted from
the proceeds of such redemption.

     Section  6.3.  Payment.  Payment of the  redemption  price of Shares of the
Trust or any Series or Class thereof shall be made in cash or in property to the
Shareholder at such time and in the manner,  not inconsistent  with the 1940 Act
or other  applicable  laws, as may be specified from time to time in the Trust's
then  effective  Prospectus,  subject to the  provisions  of Section 6.4 hereof.
Notwithstanding  the foregoing,  the Trustees may withhold from such  redemption
proceeds any amount arising (i) from a liability of the redeeming Shareholder to
the  Trust or (ii) in  connection  with any  Federal  or state  tax  withholding
requirements.

     Section 6.4. Effect of Suspension of  Determination of Net Asset Value. If,
pursuant to Section 6.9 hereof,  the Trustees  shall declare a suspension of the
determination  of net asset value with  respect to Shares of the Trust or of any
Series or Class thereof,  the rights of Shareholders  (including those who shall


                                       28
<PAGE>

have applied for redemption pursuant to Section 6.1 hereof but who shall not yet
have  received  payment) to have Shares  redeemed and paid for by the Trust or a
Series  or Class  thereof  shall be  suspended  until  the  termination  of such
suspension is declared. Any record holder who shall have his redemption right so
suspended may,  during the period of such  suspension,  by  appropriate  written
notice of revocation at the office or agency where  application was made, revoke
any application  for redemption not honored and withdraw any Share  certificates
on deposit.  The redemption  price of Shares for which  redemption  applications
have not been revoked  shall be based on the net asset value of such Shares next
determined as set forth in Section 7.1 after the termination of such suspension,
and payment  shall be made  within  seven (7) days after the date upon which the
application  was made plus the period  after such  application  during which the
determination of net asset value was suspended.

     Section 6.5.  Repurchase  by  Agreement.  The Trust may  repurchase  Shares
directly,  or through  the  Distributor  or  another  agent  designated  for the
purpose,  by agreement  with the owner  thereof at a price not exceeding the net
asset value per share determined as of the time when the purchase or contract of
purchase  is made or the net  asset  value  as of any  time  which  may be later
determined pursuant to Section 7.1 hereof,  provided payment is not made for the
Shares prior to the time as of which such net asset value is determined.

     Section 6.6. Redemption of Shareholder's  Interest.  The Trustees, in their
sole discretion,  may cause the Trust to redeem all of the Shares of one or more
Series or Class thereof held by any Shareholder if the value of such Shares held
by such  Shareholder  is less than the minimum amount  established  from time to
time by the Trustees.

     Section  6.7.  Redemption  of  Shares  in Order  to  Qualify  as  Regulated
Investment Company Disclosure of Holding. (a) If the Trustees shall, at any time
and in good faith, be of the opinion that direct or indirect ownership of Shares
or other securities of the Trust has or may become concentrated in any Person to
an extent  which  would  disqualify  the  Trust or any  Series of the Trust as a
regulated  investment  company under the Internal Revenue Code of 1986, then the
Trustees shall have the power by lot or other means deemed equitable by them (i)
to call for  redemption  by any such Person a number,  or principal  amount,  of
Shares or other securities of the Trust or any Series of the Trust sufficient to
maintain or bring the direct or indirect ownership of Shares or other securities
of the Trust or any Series of the Trust into  conformity  with the  requirements


                                       29
<PAGE>

for such  qualification  and (ii) to refuse to transfer or issue Shares or other
securities  of the  Trust  or  any  Series  of the  Trust  to any  Person  whose
acquisition of the Shares or other  securities of the Trust or any Series of the
Trust in question would result in such disqualification. The redemption shall be
effected at the redemption price and in the manner provided in Section 6.1.

              (b) The holders of Shares or other  securities of the Trust or any
     Series of the Trust shall upon demand  disclose to the  Trustees in writing
     such information with respect to direct and indirect ownership of Shares or
     other  securities  of the Trust or any Series of the Trust as the  Trustees
     deem necessary to comply with the  provisions of the Internal  Revenue Code
     of 1986, as amended, or to comply with the requirements of any other taxing
     authority.

     Section 6.8.  Reductions in Number of  Outstanding  Shares  Pursuant to Net
Asset Value Formula.  The Trust may also reduce the number of outstanding Shares
of the Trust or any Series of the Trust  pursuant to the  provisions  of Section
7.3.

     Section 6.9.  Suspension  of Right of  Redemption.  The Trust may declare a
suspension  of the  right of  redemption  or  postpone  the date of  payment  or
redemption for the whole or any part of any period (i) during which the New York
Stock Exchange is closed other than customary weekend and holiday closings, (ii)
during which trading on the New York Stock Exchange is restricted,  (iii) during
which an emergency exists as a result of which disposal by the Trust or a Series
thereof of securities  owned by it is not  reasonably  practicable  or it is not
reasonably practicable for the Trust or a Series thereof fairly to determine the
value of its net assets, or (iv) during any other period when the Commission may
for the protection of  Shareholders  of the Trust by order permit  suspension of
the tight of redemption or  postponement  of the date of payment or  redemption;
provided that applicable rules and regulations of the Commission shall govern as
to whether the conditions prescribed in clauses (ii), (iii), or (iv) exist. Such
suspension  shall take  effect at such time as the Trust  shall  specify but not
later  than the  close of  business  on the  business  day  next  following  the
declaration of suspension,  and thereafter  them shall be no right of redemption
or payment on redemption until the Trust shall declare the suspension at an end,
except  that the  suspension  shall  terminate  in any event on the first day on
which said stock exchange shall have reopened or the period specified in (ii) or
(iii) shall have  expired  (as to which in the absence of an official  ruling by


                                       30
<PAGE>

the Commission, the determination of the Trust shall be conclusive). In the case
of a suspension of the right of redemption,  a Shareholder  may either  withdraw
his  request  for  redemption  or receive  payment  based on the net asset value
existing after the termination of the suspension.


                                  ARTICLE VII

                       DETERMINATION OF NET ASSET VALUE,
                          NET INCOME AND DISTRIBUTIONS

     Section 7.1. Net Asset Value. The net asset value of each outstanding Share
of the Trust or of each Series or Class thereof shall be determined on such days
and at such time or times as the Trustees may determine. The value of the assets
of the Trust or any Series  thereof may be determined  (i) by a pricing  service
which utilizes  electronic  pricing  techniques  based on general  institutional
trading, (ii) by appraisal of the securities owned by the Trust or any Series of
the Trust,  (iii) in certain  cases,  at amortized  cost,  or (iv) by such other
method as shall be deemed to reflect the fair value thereof,  determined in good
faith by or under the  direction of the  Trustees.  From the total value of said
assets,  there shall be deducted all indebtedness,  interest,  taxes, payable or
accrued,  including  estimated  taxes on unrealized  book profits,  expenses and
management  charges  accrued to the appraisal  date,  net income  determined and
declared  as a  distribution  and all other  items in the nature of  liabilities
which shall be deemed  appropriate,  as incurred by or allocated to the Trust or
any Series or Class of the Trust. The resulting amount which shall represent the
total net assets of the Trust or Series or Class thereof shall be divided by the
number of Shares of the Trust or Series or Class thereof outstanding at the time
and the  quotient so  obtained  shall be deemed to be the net asset value of the
Shares  of the  Trust or Series  or Class  thereof.  The net asset  value of the
Shares shall be  determined  at least once on each business day, as of the close
of regular  trading on the New York Stock  Exchange  or as of such other time or
times as the  Trustees  shall  determine.  The  power and duty to make the daily
calculations  may be delegated by the Trustees to the  Investment  Adviser,  the
Administrator,  the  Custodian,  the Transfer  Agent or such other Person as the
Trustees  by  resolution  may  determine.  The  Trustees  may  suspend the daily
determination  of net asset  value to the extent  permitted  by the 1940 Act. It
shall not be a violation of any provision of this Declaration of Trust if Shares
are sold,  redeemed or  repurchased by the Trust at a price other than one based


                                       31
<PAGE>

on net asset  value if the net asset  value is  affected  by one or more  errors
inadvertently made in the pricing of portfolio securities or in accruing income,
expenses or liabilities.

     Section 7.2.  Distributions  to  Shareholders.  (a) The Trustees shall from
time to time  distribute  ratably  among the  Shareholders  of the Trust or of a
Series or Class thereof such proportion of the net profits,  surplus  (including
paid-in  surplus),  capital,  or assets of the Trust or such  Series held by the
Trustees  as they may deem  proper.  Such  distributions  may be made in cash or
property  (including  without limitation any type of obligations of the Trust or
Series or Class or any assets thereof),  and the Trustees may distribute ratably
among the Shareholders of the Trust or Series or Class thereof additional Shares
of the Trust or Series or Class thereof  issuable  hereunder in such manner,  at
such  times,  and  on  such  terms  as  the  Trustees  may  deem  proper.   Such
distributions  may be among  the  Shareholders  of the  Trust or Series or Class
thereof at the time of declaring a distribution or among the Shareholders of the
Trust or Series or Class thereof at such other date or time or dates or times as
the Trustees shall  determine.  The Trustees may in their  discretion  determine
that, solely for the purposes of such  distributions,  Outstanding  Shares shall
exclude Shares for which orders have been placed  subsequent to a specified time
on the date the  distribution  is declared or on the next  preceding  day if the
distribution  is  declared  as of a day on which  Boston  banks are not open for
business,  all as described in the then effective  Prospectus.  The Trustees may
always retain from the net profits such amount as they may deem necessary to pay
the  debts or  expenses  of the Trust or a Series  or Class  thereof  or to meet
obligations  of the  Trust or a Series  or  Class  thereof,  or as they may deem
desirable  to  use  in the  conduct  of its  affairs  or to  retain  for  future
requirements or extensions of the business.  The Trustees may adopt and offer to
Shareholders  such dividend  reinvestment  plans,  cash dividend payout plans or
related plans as the Trustees shall deem appropriate.  The Trustees may in their
discretion determine that an account  administration fee or other similar charge
may be deducted directly from the income and other  distributions paid on Shares
to a Shareholder's account in each Series or Class of the Trust.

              (b)  Inasmuch  as the  computation  of net  income  and  gains for
     Federal  income tax purposes may vary from the  computation  thereof on the
     books,  the above  provisions shall be interpreted to give the Trustees the
     power in their  discretion  to  distribute  for any fiscal year as ordinary
     dividends  and as capital  gains  distributions,  respectively,  additional
     amounts  sufficient  to enable  the Trust or a Series or Class  thereof  to
     avoid or reduce liability for taxes.


                                       32
<PAGE>

     Section 7.3. Determination of Net Income;  Reduction of Outstanding Shares.
Subject to Section 5.11 hereof, the net income of the Series and Classes thereof
of the Trust shall be determined in such manner as the Trustees shall provide by
resolution. Expenses of the Trust or of a Series or Class thereof, including the
advisory or  management  fee,  shall be accrued each day.  Each Class shall bear
only expenses  relating to its Shares and an allocable  share of Series expenses
in accordance with such policies as may be established by the Trustees from time
to time and as are not  inconsistent  with the provisions of this Declaration of
Trust or of any applicable document filed by the Trust with the Commission or of
the Internal Revenue Code of 1986, as amended. Such net income may be determined
by or under the  direction of the Trustees as of the close of trading on the New
York Stock Exchange on each day on which such market is open or as of such other
time or times as the Trustees shall  determine,  and, except a provided  herein,
all the net income of any Series or Class of the Trust, as so determined, may be
declared as a dividend on the  Outstanding  Shares of such Series or Class.  The
Trustees  shall have the  authority at any time and for any reason to reduce the
number of Shares of any Series or Class by reducing the number of Shares of such
Series or Class by reducing the number of full and fractional shares outstanding
in any such Series or Class.  Without  limiting the generality of the foregoing,
if,  for any  reason,  the net  income  of any  Series  or  Class  of the  Trust
determined  at any  time is a  negative  amount  or for any  other  reason,  the
Trustees shall have the power with respect to such Series or Class (i) to offset
each  Shareholder's  pro rata share of such  negative  amount  from the  accrued
dividend  account  of  such  Shareholder,  or  (ii)  to  reduce  the  number  of
Outstanding  Shares of such Series or Class by reducing  the number of Shares in
the account of such  Shareholder  by that number of full and  fractional  Shares
which  represents  the amount of such excess  negative  net income,  or (iii) to
cause to be recorded on the books of the Trust an asset account in the amount of
such negative net income, which account may be reduced by such amount; provided,
that the same shall  thereupon  become the property of the Trust with respect to
such  Series or Class and shall not be paid to any  Shareholder,  and  provided,
further,  that dividends  shall not be declared upon the  Outstanding  Shares of
such  Series  or  Class  on or  after  the  day  such  negative  net  income  is
experienced,  until such asset  account is reduced to zero.  The Trustees  shall
have full discretion to determine whether any cash or property received shall be
treated as income or as  principal  and  whether  any item of  expense  shall be
charged to the income or the principal account,  and their determination made in
good  faith  shall be  conclusive  upon the  Shareholders.  In the case of stock
dividends received, the Trustees shall have full discretion to determine, in the


                                       33
<PAGE>

light of the  particular  circumstances,  how much if any of the  value  thereof
shall be treated as income, the balance, if any, to be treated as principal.

     Section 7.4. Power to Modify Foregoing  Procedures.  Notwithstanding any of
the  foregoing  provisions  of this  Article  VII,  but subject to Section  5.11
hereof,  the Trustees may prescribe,  in their absolute  discretion,  such other
bases and times for  determining  the per Share net asset value of the Shares of
the Trust or a Series or Class thereof or net income of the Trust or a Series or
Class thereof,  or the declaration and payment of dividends and distributions as
they may deem  necessary or desirable.  Without  limiting the  generality of the
foregoing,  the Trustees may  establish  several  Series or Classes of Shares in
accordance with Section 5.11, and declare  dividends  thereon in accordance with
Section 5.11(d)(iv).


                                  ARTICLE VIII

                 DURATION; TERMINATION OF TRUST OR A SERIES OR
                        CLASS; AMENDMENT; MERGERS, ETC.

     Section 8.1. Duration.  The Trust shall continue without limitation of time
but subject to the provisions of this Article VIII.

     Section 8.2.  Termination of the Trust or a Series or a Class. The Trust or
any Series or Class thereof may be terminated by (i) the affirmative vote of the
holders of not less than  two-thirds of the Shares  outstanding  and entitled to
vote at any meeting of Shareholders  of the Trust or the  appropriate  Series or
Class  thereof,  (ii) by an  instrument  or  instruments  in  writing  without a
meeting, consented to by the holders of two-thirds of the Shares of the Trust or
the  appropriate  Series  or  Class  thereof;  provided,  however,  that if such
termination is recommended by the Trustees,  the vote or written  consent of the
holders of a majority  of the Shares of the Trust or the  appropriate  Series or
Class thereof outstanding and entitled to vote shall be sufficient authorization
for such termination,  or (iii) notice to Shareholders by means of an instrument
in writing signed by a majority of the Trustees,  stating that a majority of the
Trustees has determined that the  continuation of the Trust or a Series or Class
thereof is not in the best interest of such Series or Class,  the Trust or their
respective shareholders as a result of factors or events adversely affecting the
ability  of such  Series or a Class or the Trust to  conduct  its  business  and


                                       34
<PAGE>

operations in an economically viable manner. Such factors and events may include
(but are not  limited  to) the  inability  of a Series  or Class or the Trust to
maintain  its assets at an  appropriate  size,  changes  in laws or  regulations
governing  the Series or Class or the Trust or  affecting  assets of the type in
which such  Series or Class or the Trust  invests or  economic  developments  or
trends having a significant adverse impact on the business or operations of such
Series or Class or the Trust. Upon the termination of the Trust or the Series or
Class:

          (i) The Trust,  Series or Class shall carry on no business  except for
     the purpose of winding up its affairs;

          (ii) The Trustees  shall  proceed to wind up the affairs of the Trust,
     Series  or  Class  and  all  of  the  powers  of the  Trustees  under  this
     Declaration shall continue until the affairs of the Trust,  Series or Class
     shall have been wound up,  including  the power to fulfill or discharge the
     contracts of the Trust, Series or Class,  collect its assets, sell, convey,
     assign,  exchange,  transfer or otherwise dispose of all or any part of the
     remaining  Trust Property or Trust Property  allocated or belonging to such
     Series  or Class to one or more  persons  at  public  or  private  sale for
     consideration which may consist in whole or in part of cash,  securities or
     other property of any kind,  discharge or pay its  liabilities,  and do all
     other acts  appropriate to liquidate its business;  provided that any sale,
     conveyance,  assignment,  exchange, transfer or other disposition of all or
     substantially  all the  Trust  Property  or  Trust  Property  allocated  or
     belonging  to such Series or Class that  requires  Shareholder  approval in
     accordance  with Section 8.4 hereof shall receive the approval so required;
     and

          (iii)  After  paying or  adequately  providing  for the payment of all
     liabilities,  and upon receipt of such releases,  indemnities and refunding
     agreements as they deem  necessary for their  protection,  the Trustees may
     distribute the remaining  Trust  Property or the remaining  property of the
     terminated  Series or Class,  in cash or in kind or partly each,  among the
     Shareholders  of the  Trust  or the  Series  or  Class  according  to their
     respective rights.

               (b)  After  termination  of  the  Trust,   Series  or  Class  and
          distribution to the Shareholders as herein provided, a majority of the


                                       35
<PAGE>

          Trustees  shall  execute  and lodge among the records of the Trust and
          file  with  the  Office  of  the  Secretary  of  the  Commonwealth  of
          Massachusetts  an instrument in writing setting forth the fact of such
          termination,  and the Trustees shall  thereupon be discharged from all
          further  liabilities  and  duties  with  respect  to the  Trust or the
          terminated  Series or  Class,  and the  rights  and  interests  of all
          Shareholders  of the Trust or the  terminated  Series  or Class  shall
          thereupon cease.

     Section 8.3. Amendment Procedure.  (a) This Declaration may be amended by a
vote of the holders of a majority of the Shares outstanding and entitled to vote
or by any instrument in writing,  without a meeting, signed by a majority of the
Trustees and consented to by the holders of a majority of the Shares outstanding
and entitled to vote.

               (b) The Trustees may amend this  Declaration  without the vote or
          consent of  Shareholders  if they deem it  necessary  to conform  this
          Declaration to the requirements of applicable Federal or state laws or
          regulations or the  requirements of the regulated  investment  company
          provisions  of the Internal  Revenue Code of 1986,  as amended,  or if
          requested  or required  to do so by any  Federal  agency or by a state
          Blue Sky commissioner or similar official,  but the Trustees shall not
          be liable  for  failing  so to do.  The  Trustees  may also amend this
          Declaration  without the vote or consent of  Shareholders if they deem
          it necessary or desirable to change the name of the Trust or Series or
          to make any other  changes in the  Declaration  which do not adversely
          affect the rights of Shareholders hereunder. Finally, the Trustees may
          amend this Declaration without the vote or consent of Shareholders (i)
          to add to their  duties or  obligations  or  surrender  any  rights or
          powers granted to them herein; (ii) to cure any ambiguity,  to correct
          or supplement any provision herein which may be inconsistent  with any
          other provision herein or to make any other provisions with respect to
          matters or questions  arising under this Declaration which will not be
          inconsistent  with the  provisions of this  Declaration;  and (iii) to
          eliminate  or  modify  any   provision  of  this   Declaration   which
          memorializes or sets forth an existing requirement imposed by or under
          (a)  any  Federal  or  state  statute  or  any  rule,   regulation  or
          interpretation  thereof  or  thereunder  or (b) any rule,  regulation,
          interpretation  or  guideline of any federal or state  agency,  now or


                                       36
<PAGE>

          hereafter in effect,  including without  limitation,  requirements set
          forth in the 1940 Act and the rules and  regulations  thereunder  (and
          interpretations  thereof),  to the extent any change in applicable law
          liberalizes,  eliminates  or modifies any such  requirements,  but the
          Trustees shall not be liable for failure to do so.

               (c) No  amendment  may be made under this Section 8.3 which would
          change any rights with respect to any Shares of the Trust or Series or
          Class thereof by reducing the amount payable thereon upon  liquidation
          of  the  Trust  or  Series  or  Class  thereof  or by  diminishing  or
          eliminating any voting rights pertaining thereto, except with the vote
          or consent of the holders of  two-thirds of the Shares of the Trust or
          such  Series  or Class  outstanding  and  entitled  to  vote.  Nothing
          contained  in this  Declaration  shall  permit the  amendment  of this
          Declaration  to impair the exemption  from  personal  liability of the
          Shareholders, Trustees, officers, employees and agents of the Trust or
          to permit assessments upon Shareholders.

               (d) A  certificate  signed by a majority of the Trustees  setting
          forth  an  amendment  and  reciting  that it was duly  adopted  by the
          Shareholders  or by  the  Trustees  as  aforesaid  or a  copy  of  the
          Declaration,  as amended,  and executed by a majority of the Trustees,
          shall be conclusive  evidence of such  amendment when lodged among the
          records of the Trust.

     Section 8.4.  Merger,  Consolidation  and Sale of Assets.  The Trust or any
Series thereof may merge or consolidate with any other corporation, association,
trust or other  organization or may sell, lease or exchange all or substantially
all of the Trust  Property or Trust  Property  allocated  or  belonging  to such
Series,  including its good will,  upon such terms and  conditions  and for such
consideration  when and as authorized at any meeting of Shareholders  called for
the purpose by the  affirmative  vote of the holders of two-thirds of the Shares
of the  Trust  or  such  Series  outstanding  and  entitled  to  vote,  or by an
instrument  or  instruments  in writing  without a meeting,  consented to by the
holders  of  two-thirds  of the  Shares of the Trust or such  Series;  provided,
however,  that,  if such  merger,  consolidation,  sale,  lease or  exchange  is
recommended  by the  Trustees,  the vote or written  consent of the holders of a
majority of the Shares of the Trust or such Series  outstanding  and entitled to
vote shall be  sufficient  authorization;  and any such  merger,  consolidation,


                                       37
<PAGE>

sale,  lease  or  exchange  shall  be  deemed  for all  purposes  to  have  been
accomplished under and pursuant to Massachusetts law.

     Section  8.5.  Incorporation.  The  Trustees  may cause to be  organized or
assist  in  Organizing  a  corporation  or  corporations  under  the laws of any
jurisdiction or any other trust, partnership,  association or other organization
to take  over all of the  Trust  Property  or the Trust  Property  allocated  or
belonging  to such  Series or to carry on any  business in which the Trust shall
directly or indirectly have any interest,  and to sell,  convey and transfer the
Trust  Property or the Trust  Property  allocated or belonging to such Series to
any such  corporation,  trust,  association or  organization in exchange for the
shares or securities  thereof or otherwise,  and to lend money to, subscribe for
the  shares  or  securities  of,  and  enter  into any  contracts  with any such
corporation,   trust,   partnership,   association  or   organization,   or  any
corporation,  partnership, trust, association or organization in which the Trust
or such Series holds or is about to acquire  shares or any other  interest.  The
Trustees  may also  cause a merger  or  consolidation  between  the Trust or any
successor thereto and any such corporation,  trust, partnership,  association or
other  organization if and to the extent permitted by law, as provided under the
law then in effect.  Nothing  contained  herein  shall be construed as requiring
approval of  Shareholders  for the Trustees to organize or assist in  organizing
one  or  more  corporations,   trusts,   partnerships,   associations  or  other
organizations  and selling,  conveying or  transferring  all or a portion of the
Trust Property to such organization or entities.


                                   ARTICLE IX

                            REPORTS TO SHAREHOLDERS

     The Trustees shall at least  semi-annually  submit to the  Shareholders  of
each  Series a written  financial  report of the  transactions  of the Trust and
Series thereof, including financial statements which shall be certified at least
annually by independent public accountants.


                                   ARTICLE X

                                 MISCELLANEOUS

     Section 10.1.  Execution  and Filing.  This  Declaration  and any amendment


                                       38
<PAGE>

hereto  shall be filed in the office of the  Secretary  of The  Commonwealth  of
Massachusetts  and in such  other  places as may be  required  under the laws of
Massachusetts  and may also be filed or  recorded  in such  other  places as the
Trustees deem  appropriate.  Each  amendment so filed shall be  accompanied by a
certificate  signed and  acknowledged  by a Trustee stating that such action was
duly taken in a manner  provided  herein,  and  unless  such  amendment  or such
certificate sets forth some later time for the  effectiveness of such amendment,
such amendment  shall be effective upon its execution.  A restated  Declaration,
integrating  into a single  instrument all of the provisions of the  Declaration
which are then in effect and  operative,  may be executed from time to time by a
majority of the Trustees and filed with the  Secretary  of The  Commonwealth  of
Massachusetts.  A restated  Declaration  shall,  upon  execution,  be conclusive
evidence of all amendments  contained  therein and may thereafter be referred to
in lieu of the original Declaration and the various amendments thereto.

     Section 10.2.  Governing Law. This  Declaration is executed by the Trustees
and delivered in The  Commonwealth  of  Massachusetts  and with reference to the
laws  thereof,  and the  rights  of all  parties  hereto  and the  validity  and
construction  of every  provision  hereof  shall  be  subject  to and  construed
according to the laws of said Commonwealth.

     Section 10.3. Counterparts. This Declaration may be simultaneously executed
in several  counterparts,  each of which shall be deemed to be an original,  and
such counterparts, together, shall constitute one and the same instrument, which
shall be sufficiently evidenced by any such original counterpart.

     Section 10.4.  Reliance by Third Parties.  Any  certificate  executed by an
individual  who,  according to the records of the Trust  appears to be a Trustee
hereunder,  certifying  as  to  (a)  the  number  or  identity  of  Trustees  or
Shareholders,  (b) the due  authorization  of the execution Of any instrument or
writing,  (c)  the  form  of  any  vote  passed  at a  meeting  of  Trustees  or
Shareholders,  (d) the fact that the number of Trustees or Shareholders  present
at any meeting or executing any written instrument satisfies the requirements of
this Declaration,  (e) the form of any By-laws adopted by or the identity of any
officers  elected by the  Trustees,  or (f) the  existence  of any fact or facts
which in any manner  relate to the  affairs of the  Trust,  shall be  conclusive
evidence as to the matters so certified in favor of any Person  dealing with the
Trustees and their successors.



                                       39
<PAGE>

     Section  10.5.  Provisions  in Conflict  with Law or  Regulations.  (a) The
provisions  of  this  Declaration  are  severable,  and  if the  Trustees  shall
determine,  with the advice of legal counsel,  that any of such provisions is in
conflict with the 1940 Act, the regulated  investment  company provisions of the
Internal  Revenue Code of 1986, as amended,  or with other  applicable  laws and
regulations, the conflicting provision shall be deemed never to have constituted
a part of this Declaration; provided, however, that such determination shall not
affect any of the remaining  provisions of this Declaration or render invalid or
improper any action taken or omitted prior to such determination.

               (b) If any provision of this Declaration shall be held invalid or
          unenforceable in any jurisdiction, such invalidity or unenforceability
          shall attach only to such provision in such jurisdiction and shall not
          in any manner affect such provision in any other  jurisdiction  or any
          other provision of this Declaration in any jurisdiction.

     IN WITNESS WHEREOF,  the undersigned have executed this instrument this 7th
day of December, 1993.




                                      /s/ John F. Cogan, Jr.
                                      John F. Cogan, Jr.,
                                      as Trustee and not individually
                                      975 Memorial Drive, #802
                                      Cambridge, Massachusetts 02138



                                      /s/ Margaret B.W. Graham
                                      Margaret B.W. Graham,
                                      as Trustee and not individually
                                      776 Garland Drive
                                      Palo Alto, California 94303



                                      /s/ Richard H. Egdahl
                                      Richard H. Egdahl,
                                      as Trustee and not individually
                                      53 Bay State Road
                                      Boston, Massachusetts 02215


                                       40
<PAGE>


                                      /s/ John W. Kendrick
                                      John W. Kendrick,
                                      as Trustee and not individually
                                      Hyatt Residence Apt. 1521
                                      8100 Connecticut Avenue
                                      Chevy Chase, Maryland 20815



                                      /s/ Marguerite A. Piret
                                      Marguerite A. Piret,
                                      as Trustee and not individually
                                      162 Washington Street
                                      Belmont, Massachusetts 02178



                                      /s/ David D. Tripple
                                      David D. Tripple,
                                      as Trustee and not individually
                                      6 Woodbine Road
                                      Belmont, Massachusetts 02178



                                      /s/ Stephen K. West
                                      Stephen K. West,
                                      as Trustee and not individually
                                      125 Broad Street
                                      New York, New York 10004



                                      /s/ John Winthrop
                                      John Winthrop,
                                      as Trustee and not individually
                                      One North Adgels Wharf
                                      Charleston, South Carolina 29401



                                       41
<PAGE>


                         COMMONWEALTH OF MASSACHUSETTS


County of Suffolk, ss.


     On this 7th day of December,  1993,  before me personally  appeared John F.
Cogan,  Jr.,  to me known to be the person  described  in and who  executed  the
foregoing  Amended  and  Restated  Declaration  of  Trust  of the  Pioneer  U.S.
Government Trust, and acknowledged that he executed the same as his free act and
deed.

     IN WITNESS  WHEREOF,  I have  hereunto  set my hand and affixed my official
seal this 7th day of December, 1993.


                                                 /s/ Gratia E. Milliken
                                 Notary Public

                                                 My Commission Expires: 11/29/96

                                ---------------
<PAGE>


                         COMMONWEALTH OF MASSACHUSETTS


County of Suffolk, ss.

     On this 7th day of December,  1993, before me personally  appeared Margaret
B.W.  Graham,  to me known to be the person  described  in and who  executed the
foregoing  Amended  and  Restated  Declaration  of  Trust  of the  Pioneer  U.S.
Government  Trust, and  acknowledged  that she executed the same as her free act
and deed.

     IN WITNESS  WHEREOF,  I have  hereunto  set my hand and affixed my official
seal this 7th day of December, 1993.


                                                 /s/ Gratia E. Milliken
                                 Notary Public

                                                 My Commission Expires: 11/29/96

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

<PAGE>

                         COMMONWEALTH OF MASSACHUSETTS


County of Suffolk, ss.

     On this 7th day of December, 1993, before me personally appeared Richard H.
Egdahl, to me known to be the person described in and who executed the foregoing
Amended and Restated  Declaration of Trust of the Pioneer U.S. Government Trust,
and acknowledged that he executed the same as his free act and deed.

     IN WITNESS  WHEREOF,  I have  hereunto  set my hand and affixed my official
seal this 7th day of December, 1993.


                                                 /s/ Gratia E. Milliken
                                 Notary Public

                                                 My Commission Expires: 11/29/96

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

<PAGE>

                         COMMONWEALTH OF MASSACHUSETTS

County of Suffolk, ss.

     On this 7th day of December,  1993,  before me personally  appeared John W.
Hendrick,  to me  known  to be the  person  described  in and who  executed  the
foregoing  Amended  and  Restated  Declaration  of  Trust  of the  Pioneer  U.S.
Government Trust, and acknowledged that he executed the same as his free act and
deed.

     IN WITNESS  WHEREOF,  I have  hereunto  set my hand and affixed my official
seal this 7th day of December, 1993.


                                                 /s/ Gratia E. Milliken
                                 Notary Public

                                                 My Commission Expires: 11/29/96

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

<PAGE>

                         COMMONWEALTH OF MASSACHUSETTS


County of Suffolk, ss.

     On this 7th day of December, 1993, before me personally appeared Marguerite
R.  Piret,  to me known  to be the  person  described  in and who  executed  the
foregoing  Amended  and  Restated  Declaration  of  Trust  of the  Pioneer  U.S.
Government  Trust, and  acknowledged  that she executed the same as her free act
and deed.

     IN WITNESS  WHEREOF,  I have  hereunto  set my hand and affixed my official
seal this 7th day of December, 1993.


                                                 /s/ Gratia E. Milliken
                                 Notary Public

                                                 My Commission Expires: 11/29/96

                                ---------------
<PAGE>


                         COMMONWEALTH OF MASSACHUSETTS

County of Suffolk, ss.

     On this 7th day of December,  1993, before me personally  appeared David D.
Tripple,  to me  known  to be the  person  described  in and  who  executed  the
foregoing  Amended  and  Restated  Declaration  of  Trust  of the  Pioneer  U.S.
Government Trust, and acknowledged that he executed the same as his free act and
deed.

     IN WITNESS  WHEREOF,  I have  hereunto  set my hand and affixed my official
seal this 7th day of December, 1993.


                                                 /s/ Gratia E. Milliken
                                 Notary Public

                                                 My Commission Expires: 11/29/96

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

<PAGE>

                         COMMONWEALTH Of MASSACHUSETTS


County of Suffolk, ss.

     On this 7th day of December, 1993, before me personally appeared Stephen H.
West,  to me known to be the person  described in and who executed the foregoing
Amended and Restated  Declaration of Trust of the Pioneer U.S. Government Trust,
and acknowledged that he executed the same as his free act and deed.

     IN WITNESS  WHEREOF,  I have  hereunto  set my hand and affixed my official
seal this 7th day of December, 1993.


                                                 /s/ Gratia E. Milliken
                                 Notary Public

                                                 My Commission Expires: 11/29/96

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

<PAGE>

                         COMMONWEALTH Of MASSACHUSETTS

County of Suffolk, ss.

     On this 7th day of  December,  1993,  before me  personally  appeared  John
Winthrop,  to me  known  to be the  person  described  in and who  executed  the
foregoing  Amended  and  Restated  Declaration  of  Trust  of the  Pioneer  U.S.
Government  Trust, and acknowledged that he executed the same a his free act and
deed.

     IN WITNESS  WHEREOF,  I have  hereunto  set my hand and affixed my official
seal this 7th day of December, 1993.


                                                 /s/ Gratia E. Milliken
                                 Notary Public

                                                 My Commission Expires: 11/29/96

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



           AMENDMENT TO THE AMENDED AND RESTATED DECLARATION OF TRUST
                           dated December 7, 1993 of

                         PIONEER U.S. GOVERNMENT TRUST


     The  undersigned,  being  a  majority  of  the  Trustees  of  Pioneer  U.S.
Government Trust, a Massachusetts business trust (the "Trust"),  acting pursuant
to Article VIII, Section 8.3(b) of the Amended and Restated Declaration of Trust
dated  December 7, 1993 of the Trust (the  "Declaration"),  do hereby  amend the
Declaration as follows:

     1.   Section 1.1 of the Declaration is hereby deleted and replaced with the
          following:

            Section 1.1.  Name. The name of the Trust created hereby is "Pioneer
            America Income Trust" (the "Trust").

     2.  Section  5.11(a) of the Declaration is hereby deleted and replaced with
         the following:

            Section 5.11. Series or Class Designation.  (a) Without limiting the
            authority of the Trustees set forth in Section 5.1 to establish  and
            designate any further Series,  it is hereby confirmed that the Trust
            consists of the presently Outstanding Shares of one Series: "Pioneer
            America Income Trust" (the "Existing Series").

     IN WITNESS WHEREOF, the undersigned have executed this instrument this 16th
day of June, 1994.





John F. Cogan, Jr.                      Marguerite A. Piret
as Trustee and not individually         as Trustee and not individually
975 Memorial Drive, #802                162 Washington Street
Cambridge, MA  02138                    Belmont, MA  02178




Richard H. Egdahl, M.D.                 David D. Tripple
as Trustee and not individually         as Trustee and not individually
Health Policy Institute                 6 Woodbine Road
53 Bay State Road                       Belmont, MA  02178
Boston, MA  02215



Margaret B.W. Graham                    Stephen K. West, Esq.
as Trustee and not individually         as Trustee and not individually
776 Garland Drive                       Sullivan & Cromwell
Palo Alto, CA  94303                    125 Broad Street
                                        New York, NY 10004



John W. Kendrick                        John Winthrop
as Trustee and not individually         as Trustee and not individually
6363 Waterway Drive                     52 King Street
Falls Church, VA 22044                  Charleston, SC  29401





                         PIONEER U.S. GOVERNMENT TRUST

                         Establishment and Designation
                                       of
                       Class A Shares and Class B Shares
                           of Beneficial Interest of
                         Pioneer U.S. Government Trust

     The  undersigned,  being  a  majority  of  the  Trustees  of  Pioneer  U.S.
Government Trust, a Massachusetts  business trust (the "Fund"),  acting pursuant
to Sections 5.1 and 5.11 of the Amended and Restated  Declaration of Trust dated
December 7, 1993 of the Fund, as amended from time to time (the  "Declaration"),
do hereby divide the shares of beneficial  interest of the Fund (the  "Shares"),
to create two classes of Shares of the Fund as follows:

     1.   The two classes of Shares established and designated hereby are "Class
          A Shares" and "Class B Shares," respectively.

     2.   Class A Shares and Class B Shares shall each be entitled to all of the
          rights and preferences accorded to Shares under the Declaration.

     3.   The purchase price of Class A Shares and of Class B Shares, the method
          of  determining  the net asset  value of Class A Shares and of Class B
          Shares,  and the relative dividend rights of holders of Class A Shares
          and of holders of Class B Shares shall be  established by the Trustees
          of the Fund in accordance  with the provisions of the  Declaration and
          shall be set forth in the Fund's  Registration  Statement on Form N-1A
          under the Securities Act of 1933 and/or the Investment  Company Act of
          1940, as amended and as in effect at the time of issuing such Shares.

     4.   All Shares of the Fund issued  prior to the filing of this  instrument
          with the Secretary of State of The Commonwealth of Massachusetts shall
          be  deemed  Class A Shares  and the  Trustees,  acting  in their  sole
          discretion,  may  determine  that any Shares of the Fund issued  after
          such time are  Class A  Shares,  Class B Shares or Shares of any other
          class  of  the  Fund  hereafter  established  and  designated  by  the
          Trustees.

     IN WITNESS WHEREOF,  the undersigned have executed this instrument this 7th
day of December, 1993.


John F. Cogan, Jr.                      Marguerite A. Piret
as Trustee and not individually         as Trustee and not individually
975 Memorial Drive, #802                162 Washington Street
Cambridge, MA  02138                    Belmont, MA  02178

Richard H. Egdahl, M.D.                 David D. Tripple
as Trustee and not individually         as Trustee and not individually
Health Policy Institute                 6 Woodbine Road
53 Bay State Road                       Belmont, MA  02178
Boston, MA  02215

Margaret B.W. Graham                    Stephen K. West, Esq.
as Trustee and not individually         as Trustee and not individually
776 Garland Drive                       Sullivan & Cromwell
Palo Alto, CA  94303                    125 Broad Street
                                        New York, NY 10004

John W. Kendrick                        John Winthrop
as Trustee and not individually         as Trustee and not individually
Hyatt Residence, Apt. 1521              52 King Street
8100 Connecticat Ave.                   Charleston, SC  29401
Chevy Chase, MD  20815




                              MANAGEMENT CONTRACT


     THIS  AGREEMENT  dated this 1st day of January,  1994 between  Pioneer U.S.
Government Trust, a Massachusetts  business trust (the "Trust"),  and Pioneering
Management Corporation, a Delaware corporation (the "Manager").

                                   WITNESSETH

     WHEREAS,  the Trust is  registered  as an open-end,  management  investment
company under the  Investment  Company Act of 1940, as amended (the "1940 Act"),
and has filed with the Securities and Exchange  Commission (the  "Commission") a
registration  statement  (the  "Registration  Statement")  for  the  purpose  of
registering  its shares for public offering under the Securities Act of 1933, as
amended,

     WHEREAS, the Trust currently issues one series of shares (the "portfolio").

     WHEREAS, the parties hereto deem it mutually  advantageous that the Manager
should be engaged,  subject to the  supervision of the Trust's Board of Trustees
and officers, to manage the Trust,

     NOW,  THEREFORE,  in consideration of the mutual covenants and benefits set
forth herein, the Trust and the Manager do hereby agree as follows:

     1. (a) The Manager will regularly provide investment  research,  advice and
supervision  and  will  furnish  continuously  an  investment  program  for  the
Portfolio  consistent  with  the  investment  objectives  and  policies  of  the
Portfolio. The Manager will determine from time to time what securities shall be
purchased  for the  Portfolio,  what  securities  shall  be held or sold for the
Portfolio's  account and what  portion of the  Portfolio's  assets shall be held
uninvested as cash, subject always to the provisions of the Trust's  Declaration
of Trust,  By-Laws and its registration  statements under the 1940 Act and under
the  Securities  Act of 1933  covering  the  Trust's  shares,  as filed with the
<PAGE>

Securities and Exchange Commission,  and to the investment objectives,  policies
and  restrictions  of the  Portfolio,  as each of the same shall be from time to
time in effect, and subject,  further,  to such policies and instructions as the
Board of  Trustees  of the Trust may from time to time  establish.  To carry out
such  determinations,  the Manager will  exercise full  discretion  and act with
respect to the  Portfolio  in the same manner and with the same force and effect
as the Trust itself might or could do with respect to purchases,  sales or other
transactions,  as  well  as  with  respect  to all  other  things  necessary  or
incidental  to the  furtherance  or  conduct of such  purchases,  sales or other
transactions.

        (b) The Manager will, to the extent  reasonably  required in the conduct
of the business of the Portfolio and upon the Trust's request, furnish research,
statistical and advisory reports upon the industries,  businesses,  corporations
or  securities  as to which  such  requests  shall be made,  whether  or not the
Portfolio shall at the time have any investment in such industries,  businesses,
corporations  or  securities.  The  Manager  will  use its best  efforts  in the
preparation of such reports and will endeavor to consult the persons and sources
believed by it to have  information  available with respect to such  industries,
businesses, corporations or entities.

        (c) The Manager will  maintain all books and records with respect to the
Portfolio's securities  transactions required by sub-paragraphs (b)(5), (6), (9)
and (10) and  paragraph  (f) of Rule 31a-1  under the 1940 Act (other than those
records being  maintained by the  custodian or transfer  agent  appointed by the
Trust with respect to the  Portfolio)  and preserve such records for the periods
prescribed therefor by Rule 31a-2 of the 1940 Act. The Manager will also provide
to the Board of Trustees  such  periodic  and  special  reports as the Board may
reasonably request.

     2. The  Manager  recognizes  that the Trust  may from  time to time  create
additional  investment  portfolios,  that  this  agreement  relates  only to the
management of the assets of the Portfolio, and that the management of the assets
of any additional portfolio of the Trust are subject, or will be subject, to one
or more separate investment management agreements.

     3. (a)  Except  as  otherwise  provided  herein,  the  Manager,  at its own
expense,  shall  furnish to the Trust office space in the offices of the Manager
or in such  other  place  as may be  agreed  upon  from  time to  time,  and all


                                       2
<PAGE>

necessary  office  facilities,  equipment and personnel for managing the affairs
and investments with respect to the Portfolio,  and shall arrange, if desired by
the Trust,  for members of the  Manager's  organization  to serve as officers or
agents of the Trust.

        (b) The Manager  shall pay directly or reimburse  the Trust for: (i) the
compensation  (if any) of the Trustees who are  affiliated  with,  or interested
persons  of, the Manager  and all  officers  of the Trust as such;  and (ii) all
expenses  not  hereinafter  specifically  assumed by the Trust or the  Portfolio
where such expenses are incurred by the Manager or by the Trust or the Portfolio
in  connection  with the  management of the affairs of, and the  investment  and
reinvestment of the assets of, the Portfolio.

        (c) The Trust shall  assume and shall pay:  (i) charges and expenses for
fund accounting, pricing and appraisal services and related overhead, including,
to the extent such  services  are  performed  by personnel of the Manager or its
affiliates, office space and facilities and personnel compensation, training and
benefits;  (ii) the charges  and  expenses  of  auditors;  (iii) the charges and
expenses of any custodian,  transfer agent,  plan,  agent,  dividend  disbursing
agent and registrar  appointed by the Trust with respect to the Portfolio;  (iv)
issue and transfer taxes,  chargeable to the Trust in connection with securities
transactions  to which the Trust is a party;  (v) insurance  premiums,  interest
charges,  dues and fees for membership in trade  associations  and all taxes and
corporate  fees  payable by the Trust to  federal,  state or other  governmental
agencies;  (vi)  fees and  expenses  involved  in  registering  and  maintaining
registrations of the Trust and/or its shares with the Commission,  state or blue
sky  securities  agencies and foreign  countries,  including the  preparation of
Prospectuses  and  Statements  of  Additional  Information  for filing  with the
Commission;  (vii) all expenses of shareholders'  and Trustees'  meetings and of
preparing, printing and distributing prospectuses, notices, proxy statements and
all reports to  shareholders  and to governmental  agencies;  (viii) charges and
expenses of legal  counsel to the Trust and to the Trustees;  (ix)  distribution
fees  paid by the  Trust  in  accordance  with  Rule  12b-1  promulgated  by the
Commission  pursuant to the 1940 Act; (x)  compensation of those Trustees of the
Trust who are not  affiliated  with or  interested  persons of the Manager,  the
Trust  (other than as  Trustees),  The  Pioneer  Group,  Inc.  or Pioneer  Funds
Distributor,  Inc.; (xi) the cost of preparing and printing share  certificates;
and (xii) interest on borrowed money, if any.



                                       3
<PAGE>

        (d) In addition to the expenses  described  in Section  3(c) above,  the
Trust shall pay all  brokers' and  underwriting  commissions  chargeable  to the
Trust in connection with securities transactions to which the Trust is a party.

     4.  (a)  The  Trust  shall  pay to the  Manager,  as  compensation  for the
Manager's  services  hereunder,  a fee at the  rate of  0.50%  per  annum of the
Portfolio's average daily net assets. The management fee payable hereunder shall
be computed  daily and paid monthly in arrears.  In the event of  termination of
this Agreement,  the fee provided in this Section shall be computed on the basis
of the period  ending on the last  business  day on which this  Agreement  is in
effect subject to a pro rata  adjustment  based on the number of days elapsed in
the current month as a percentage of the total number of days in such month.

        (b) If the  operating  expenses of the  Portfolio in any year exceed the
limits set by state  securities laws or regulations in states in which shares of
the Portfolio are sold, the amount  payable to the Manager under  subsection (a)
above  will be  reduced  (but not below $0),  and the  Manager  shall make other
arrangements  concerning  expenses  but,  in each  instance,  only as and to the
extent  required  by such laws or  regulation.  If  amounts  have  already  been
advanced  to the Manager  under this  Agreement,  the  Manager  will return such
amounts to the Trust to the extent required by the preceding sentence.

        (c) In  addition  to the  foregoing,  the  Manager may from time to time
agree not to impose all or a portion of its fee otherwise  payable hereunder (in
advance of the time such fee or a portion thereof would otherwise accrue) and/or
undertake to pay or reimburse the Trust for all or a portion of its expenses not
otherwise  required  to be  borne or  reimbursed  by the  Manager.  Any such fee
reduction or undertaking  may be  discontinued or modified by the Manager at any
time.

     5. The  Manager  will not be liable for any error of judgment or mistake of
law or for any loss sustained by reason of the adoption of any investment policy
or the purchase, sale, or retention of any security on the recommendation of the
Manager,  whether or not such recommendation  shall have been based upon its own
investigation and research or upon  investigation and research made by any other
individual, firm or corporation,  but nothing contained herein will be construed
to protect the Manager  against any  liability  to the Trust or Portfolio or its
shareholders by reason of willful misfeasance,  bad faith or gross negligence in
the  performance  of its duties or by reason of its  reckless  disregard  of its
obligations and duties under the Agreement.


                                       4
<PAGE>

     6. (a)  Nothing in this  Agreement  will in any way limit or  restrict  the
Manager or any of its officers,  directors, or employees from buying, selling or
trading in any securities for its or their own accounts or other  accounts.  The
Manager  may  act  as an  investment  advisor  to  any  other  person,  firm  or
corporation,  and may perform  management  and any other  services for any other
person, association,  corporation, firm or other entity pursuant to any contract
or  otherwise,  and take any action or do any thing in  connection  therewith or
related  thereto;  and no such  performance  of management or other  services or
taking of any such  action  or doing of any such  thing  shall be in any  manner
restricted  or  otherwise  affected  by any  aspect of any  relationship  of the
Manager  to or with the Trust or deemed to  violate  or give rise to any duty or
obligation  of the Manager to the Trust except as otherwise  imposed by law. The
Trust  recognizes  that  Manager,  in  effecting  transactions  for its  various
accounts,  may not always be able to take or liquidate  investment  positions in
the same security at the same time and at the same price.

        (b) In connection  with  purchases or sales of portfolio  securities for
the account of the  Portfolio,  neither  the  Manager nor any of its  Directors,
officers or employees will act as a principal or agent or receive any commission
except as permitted by the 1940 Act. The Manager  shall  arrange for the placing
of all  orders  for the  purchase  and  sale  of  portfolio  securities  for the
Portfolio's  account  with brokers or dealers  selected by the  Manager.  In the
selection of such brokers or dealers and the placing of such orders, the Manager
is directed at all times to seek for the Portfolio the most favorable  execution
and net price available except as described  herein.  It is also understood that
it is desirable for the Portfolio  that the Manager have access to  supplemental
investment and market  research and security and economic  analyses  provided by
brokers who may execute brokerage transactions at a higher cost to the Portfolio
than may  result  when  allocating  brokerage  to other  brokers on the basis of
seeking the most favorable price and efficient execution. Therefore, the Manager
is authorized  to place orders for the purchase and sale of  securities  for the
Portfolio's account with such brokers, subject to review by the Trust's Trustees
from time to time with respect to the extent and  continuation of this practice.
It is understood that the services provided by such brokers may be useful to the
Manager in connection with its or its affiliates  services to other clients.  In
addition,  subject  to the  Manager's  obligation  to seek  the  most  favorable
execution  and net  price  available,  the  Manager  may  consider  the  sale of
Portfolio shares in selecting brokers and dealers.



                                       5
<PAGE>

        (c) On  occasions  when the  Manager  deems  the  purchase  or sale of a
security to be in the best interest of the  Portfolio as well as other  clients,
the Manager,  to the extent  permitted by applicable laws and  regulations,  may
aggregate  the  securities  to be sold or  purchased in order to obtain the best
execution and lower brokerage commissions,  if any. In such event, allocation of
the  securities  so purchased or sold,  as well as the expenses  incurred in the
transaction,  will be made by the Manager in the manner it  considers  to be the
most  equitable and consistent  with its fiduciary  obligations to the Portfolio
and to such clients.

     7. This  Agreement  shall  become  effective  on the date  hereof and shall
remain in force until May 31, 1995 and from year to year thereafter, but only so
long as its  continuance  is approved  annually by a vote of the Trustees of the
Trust voting in person, including a majority of its Trustees who are not parties
to this  Agreement or interested  persons (as the term  "interested  persons" is
defined in the 1940 Act) of any such  parties,  at a meeting of Trustees  called
for the purpose of voting on such  approval  or by a vote of a "majority  of the
outstanding  voting  securities"  (as defined in the 1940 Act) of the Portfolio,
subject to the right of the Trust and the Manager to terminate  this contract as
provided in Section 8 hereof.

     8. Either party hereto may,  without  penalty,  terminate this Agreement by
vote of its Board of Directors or its Board of Trustees,  as the case may be, or
by vote of a "majority of its outstanding  voting securities" (as defined in the
1940 Act) of the  Portfolio  and the  giving of 60 days'  written  notice to the
other party.

     9.  This  Agreement  shall  automatically  terminate  in the  event  of its
assignment. For purposes of this Agreement, the term "assignment" shall have the
meaning given it by Section 2(a)(4) of the 1940 Act.

     10. The  Manager is an  independent  contractor  and not an employee of the
Trust or Portfolio  for any purpose.  If any occasion  should arise in which the
Manager gives any advice to its clients  concerning the shares of the Portfolio,
the Manager  will act solely as  investment  counsel for such clients and not in
any way on behalf of the Trust or Portfolio.

     11. This Agreement states the entire  agreement of the parties hereto,  and
is intended to be the complete and exclusive  statement of the terms hereof.  It


                                       6
<PAGE>

may not be added to or changed  orally,  and may not be  modified  or  rescinded
except by a writing signed by the parties hereto and in accordance with the 1940
Act, when applicable.

     12. This Agreement and all  performance  hereunder shall be governed by the
laws of The Commonwealth of Massachusetts,  which apply to contracts made and to
be performed in The Commonwealth of Massachusetts.

     13.  Any  term  or  provision  of  this  Agreement   which  is  invalid  or
unenforceable in any jurisdiction  shall, as to such jurisdiction be ineffective
to the extent of such invalidity or  unenforceability  without rendering invalid
or  unenforceable  the  remaining  terms  or  provisions  of this  Agreement  or
affecting  the validity or  enforceability  of any of the terms or provisions of
this Agreement in any other jurisdiction.

     14.  The  parties  to  this  Agreement   acknowledge  and  agree  that  all
liabilities arising hereunder,  whether direct or indirect, and of any and every
nature  whatsoever  shall be satisfied solely out of the assets of the portfolio
affected thereby and that no Trustee,  officer or holder of shares of beneficial
interest  of the  Trust  shall be  personally  liable  for any of the  foregoing
liabilities.  The Trust's Declaration of Trust, as amended from time to time, is
on  file  in the  Office  of the  Secretary  of  State  of The  Commonwealth  of
Massachusetts.  Such  Declaration  of Trust  describes in detail the  respective
responsibilities  and  limitations on liability of the Trustees,  officers,  and
holders of shares of beneficial interest.

     15.  This  Agreement  may  be  executed   simultaneously  in  two  or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.


                                       7
<PAGE>

     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
executed by their duly  authorized  officers and their seal to be hereto affixed
as of the day and year first above written.


ATTEST:                               PIONEER U.S. GOVERNMENT TRUST


/s/ Joseph P. Barri                   /s/ John F. Cogan, Jr.



ATTEST:                               PIONEERING MANAGEMENT CORPORATION
                                      


/s/ Joseph P. Barri                   /s/ John F. Cogan, Jr.





                               AGREEMENT BETWEEN









                         BROWN BROTHERS HARRIMAN & CO.









                                      AND







                         PIONEER U. S. GOVERNMENT TRUST

                       (now Pioneer America Income Trust)



<PAGE>


                              CUSTODIAN AGREEMENT



        AGREEMENT  made this 23rd day of December,  1991  between  PIONEER U. S.
GOVERNMENT   TRUST  (the  "Fund")  and  Brown  Brothers   Harriman  &  Co.  (the
"Custodian");

        WITNESSETH: That in consideration of the mutual covenants and agreements
herein contained, the parties hereto agree as follows:

1.  Employment of Custodian:  The Fund hereby employs and appoints the Custodian
as a custodian for the term and subject to the provisions of this Agreement. The
Custodian  shall  not be under any duty or  obligation  to  require  the Fund to
deliver  to it any  securities  or funds  owned by the  Fund and  shall  have no
responsibility  or  liability  for or on account of  securities  or funds not so
delivered. The Fund will deposit with the Custodian copies of the Declaration of
Trust or Certificate of Incorporation  and By-Laws (or comparable  documents) of
the  Fund and all  amendments  thereto,  and  copies  of such  votes  and  other
proceedings  of the Fund as may be necessary  for or convenient to the Custodian
in the performance of its duties.

2. Powers and Duties of the Custodian  with respect to Property of the Fund held
by the Custodian:  Except for securities and funds held by any  Subcustodians or
held  by the  Custodian  through  a  non-U.S.  securities  depository  appointed
pursuant to the  provisions of Section 3 hereof,  the  Custodian  shall have and
perform the following powers and duties:

A. Safekeeping - To keep safely the securities and other assets of the Fund that
have been  delivered to the Custodian  and, on behalf of the Fund,  from time to
time to receive delivery of securities for safekeeping.

B. Manner of Holding Securities - To hold securities of the Fund (1) by physical
possession of the share  certificates  or other  instruments  representing  such
securities  in  registered  or  bearer  form,  or (2) in  book-entry  form  by a
Securities System (as said term is defined in Section 2U).

C. Registered Name;  Nominee - To hold registered  securities of the Fund (1) in
<PAGE>

the name or any nominee name of the Custodian or the Fund, or in the name or any
nominee  name of any Agent  appointed  pursuant  to Section 6F, or (2) in street
certificate form,  so-called,  and in any case with or without any indication of
fiduciary  capacity,  provided  that  securities  are held in an  account of the
Custodian containing only assets of the Fund or only assets held as fiduciary or
custodian for customers.

D. Purchases - Upon receipt of Proper  Instructions,  as defined in Section X on
Page 16, insofar as funds are available for the purpose,  to pay for and receive
securities  purchased for the account of the Fund,  payment being made only upon
receipt of the securities (1) by the Custodian, or (2) by a clearing corporation
of a national  securities exchange of which the Custodian is a member, or (3) by
a Securities System.  However, (i) in the case of repurchase  agreements entered
into by the Fund,  the  Custodian  (as well as an Agent) may release  funds to a
Securities  System or to a Subcustodian  prior to the receipt of advice from the
Securities System or Subcustodian that the securities underlying such repurchase
agreement  have been  transferred  by book entry into the Account (as defined in
Section 2U) of the Custodian  (or such Agent)  maintained  with such  Securities
System or Subcustodian,  so long as such payment  instructions to the Securities
System or  Subcustodian  include a  requirement  that  delivery is only  against
payment for securities, (ii) in the case of foreign exchange contracts, options,
time deposits,  call account deposits,  currency  deposits,  and other deposits,
contracts or options  pursuant to Sections 2J, 2L, 2M and 2N, the  Custodian may
make payment therefor without  receiving an instrument  evidencing said deposit,
contract  or  option  so long  as  such  payment  instructions  detail  specific
securities to be acquired,  and (iii) in the case of securities in which payment
for the security and receipt of the instrument evidencing the security are under
generally  accepted trade  practice or the terms of the instrument  representing
the security  expected to take place in different  locations or through separate
parties,  such as commercial paper which is indexed to foreign currency exchange
rates,  derivatives and similar  securities,  the Custodian may make payment for
such  securities  prior to delivery  thereof in accordance  with such  generally
accepted  trade  practice  or the  terms  of the  instrument  representing  such
security.

E. Exchanges - Upon receipt of proper instructions,  to exchange securities held
by it for the account of the Fund for other  securities in  connection  with any
reorganization,  recapitalization,  split-up  of  shares,  change of par  value,
conversion  or other  event  relating  to the  securities  or the issuer of such


                                       2
<PAGE>

securities  and to deposit any such  securities in accordance  with the terms of
any  reorganization  or  protective  plan.  Without  proper  instructions,   the
Custodian may surrender securities in temporary form for definitive  securities,
may surrender  securities  for transfer into a name or nominee name as permitted
in  Section  2C,  and  may  surrender  securities  for  a  different  number  of
certificates  or  instruments  representing  the same  number  of shares or same
principal amount of indebtedness, provided the securities to be issued are to be
delivered to the Custodian.

F. Sales of Securities - Upon receipt of proper  instructions,  to make delivery
of securities which have been sold for the account of the Fund, but only against
payment therefor (1) in cash, by a certified check,  bank cashier's check,  bank
credit, or bank wire transfer,  or (2) by credit to the account of the Custodian
with a clearing  corporation  of a  national  securities  exchange  of which the
Custodian  is a member,  or (3) by credit to the account of the  Custodian or an
Agent of the Custodian with a Securities System; provided,  however, that (i) in
the case of  delivery  of  physical  certificates  or  instruments  representing
securities, the Custodian may make delivery to the broker buying the securities,
against receipt  therefor,  for examination in accordance with "street delivery"
custom, provided that the payment therefor is to be made to the Custodian (which
payment  may be made by a  broker's  check)  or that such  securities  are to be
returned to the  Custodian,  and (ii) in the case of  securities  referred to in
clause  (iii) of the  last  sentence  of  Section  2D,  the  Custodian  may make
settlement,  including with respect to the form of payment,  in accordance  with
generally  accepted trade practice  relating to such  securities or the terms of
the instrument representing said security.

G.  Depositary  Receipts - Upon  receipt of proper  instructions,  to instruct a
Subcustodian  or an Agent to surrender  securities to the depositary  used by an
issuer of American  Depositary  Receipts or  International  Depositary  Receipts
(hereinafter  collectively  referred to as "ADRs") for such securities against a
written  receipt  therefor  adequately  describing  such  securities and written
evidence  satisfactory  to the  Subcustodian  or Agent that the  depositary  has
acknowledged  receipt of  instructions  to issue with respect to such securities
ADRs in the name of the Custodian,  or a nominee of the Custodian,  for delivery
to the  Custodian  in  Boston,  Massachusetts,  or at such  other  place  as the
Custodian may from time to time designate.

Upon receipt of proper  instructions,  to surrender  ADRs to the issuer  thereof
against a written receipt  therefor  adequately  describing the ADRs surrendered


                                       3
<PAGE>

and written  evidence  satisfactory to the Custodian that the issuer of the ADRs
has acknowledged  receipt of instructions to cause its depositary to deliver the
securities underlying such ADRs to a Subcustodian or an Agent.

H.  Exercise  of  Rights;   Tender  Offers  -  Upon  timely  receipt  of  proper
instructions,  to deliver to the issuer or trustee  thereof,  or to the agent of
either,  warrants,  puts, calls, rights or similar securities for the purpose of
being  exercised or sold,  provided  that the new  securities  and cash, if any,
acquired by such action are to be delivered to the Custodian,  and, upon receipt
of proper  instructions,  to deposit  securities upon invitations for tenders of
securities,  provided that the  consideration  is to be paid or delivered or the
tendered securities are to be returned to the Custodian.

I. Stock Dividends,  Rights,  Etc. - To receive and collect all stock dividends,
rights and other  items of like  nature;  and to deal with the same  pursuant to
proper instructions relative thereto.

J.  Options.  - Upon  receipt  of proper  instructions,  to  receive  and retain
confirmations or other documents evidencing the purchase of writing of an option
on a security or  securities  index by the Fund;  to deposit  and  maintain in a
segregated  account,  either physically or by book-entry in a Securities System,
securities  subject to a covered call option written by the Fund; and to release
and/or  transfer such  securities  or other assets only in  accordance  with the
provisions of any agreement  among the Fund,  the Custodian and a  broker-dealer
relating  to such  securities  or other  assets a notice or other  communication
evidencing  the  expiration,  termination  or  exercise of such  covered  option
furnished  by The  Options  Clearing  Corporation,  the  securities  or  options
exchange on which such covered  option is traded or such other  organization  as
may be responsible for handling such options transactions.

K. Borrowings - Upon receipt of proper  instructions,  to deliver  securities of
the Fund to lenders or their agents as collateral for borrowings effected by the
Fund,  provided that such borrowed  money is payable to or upon the  Custodian's
order as Custodian for the Fund.

L. Demand  Deposit Bank Accounts - To open and operate an account or accounts in
the name of the Fund on the Custodian's  books subject only to draft or order by
the  Custodian.  All funds  received by the Custodian from or for the account of
the Fund shall be  deposited in said  account(s).  The  responsibilities  of the


                                       4
<PAGE>

Custodian to the Fund for deposits  accepted on the  Custodian's  books shall be
that of a U. S. bank for a similar deposit.

If and when  authorized  by  proper  instructions,  the  Custodian  may open and
operate an additional  account(s) in such other banks or trust  companies as may
be designated by the Fund in such  instructions  (any such bank or trust company
so  designated   by  the  Fund  being   referred  to  hereafter  as  a  "Banking
Institution"),  provided that such account(s) (hereinafter collectively referred
to as "demand deposit bank accounts")  shall be in the name of the Custodian for
account of the Fund and subject  only to the  Custodian's  draft or order.  Such
demand deposit  accounts may be opened with Banking  Institutions  in the United
States and in other  countries and may be denominated in either U. S. Dollars or
other currencies as the Fund may determine. All such deposits shall be deemed to
be portfolio  securities of the Fund and accordingly the  responsibility  of the
Custodian  therefore  shall be the same as and no greater  than the  Custodian's
responsibility in respect of other portfolio securities of the Fund.

M. Interest Bearing Call or Time Deposits - To place interest bearing fixed term
and call  deposits with such banks and in such amounts as the Fund may authorize
pursuant to proper instructions.  Such deposits may be placed with the Custodian
or with  Subcustodians or other Banking  Institutions as the Fund may determine.
Deposits may be denominated in U. S. Dollars or other currencies and need not be
evidenced  by the  issuance  or  delivery  of a  certificate  to the  Custodian,
provided  that the  Custodian  shall  include in its records with respect to the
assets of the Fund  appropriate  notation as to the amount and  currency of each
such deposit,  the accepting Banking Institution and other appropriate  details,
and shall retain such forms of advice or receipt evidencing the deposit, if any,
as may be forwarded to the Custodian by the Banking Institution.  Such deposits,
other than those placed with the Custodian, shall be deemed portfolio securities
of the Fund and the responsibilities of the Custodian therefor shall be the same
as those for demand deposit bank accounts  placed with other banks, as described
in Section K of this  Agreement.  The  responsibility  of the Custodian for such
deposits  accepted on the  Custodian's  books shall be that of a U.S. bank for a
similar deposit.

N.  Foreign  Exchange  Transactions  and  Futures  Contracts  Pursuant to proper
instructions,  to enter into foreign  exchange  contracts or options to purchase
and sell foreign  currencies for spot and future  delivery on behalf and for the
account of the Fund. Such  transactions  may be undertaken by the Custodian with


                                       5
<PAGE>

such Banking  Institutions,  including  the  Custodian  and  Subcustodian(s)  as
principals,  as approved and authorized by the Fund.  Foreign exchange contracts
and options other than those executed with the Custodian,  shall be deemed to be
portfolio  securities  of the Fund  and the  responsibilities  of the  Custodian
therefor shall be the same as those for demand deposit bank accounts placed with
other banks as described in Section 2L of this agreement. Upon receipt of proper
instructions,  to receive and retain  confirmations  evidencing  the purchase or
sale of a futures  contract or an option on a futures  contract by the Fund;  to
deposit and  maintain in a  segregated  account,  for the benefit of any futures
commission  merchant  or to pay to  such  futures  commission  merchant,  assets
designated by the fund as initial,  maintenance or variation  "margin"  deposits
intended to secure the Fund's  performance of its obligations  under any futures
contracts  purchased or sold or any options on futures  contracts written by the
Fund, in accordance with the provisions of any agreement or agreements among any
of the Fund, the Custodian and such futures commission  merchant,  designated to
comply with the rules of the Commodity  Futures  Trading  Commission  and/or any
contract market, or any similar  organization or  organizations,  regarding such
margin  deposits;  and to release and/or transfer assets in such margin accounts
only in accordance with any such agreements or rules.

0. Stock Loans - Upon receipt of proper  instructions,  to deliver securities of
the Fund,  in  connection  with loans of securities by the Fund, to the borrower
thereof prior to receipt of the collateral, if any, for such borrowing, provided
that for stock loans secured by cash collateral the Custodian's  instructions to
the  Securities  System  require  that the  Securities  System may  deliver  the
securities to the borrower  thereof only upon receipt of the collateral for such
borrowing.

P. Collections - To collect, receive and deposit in said account or accounts all
income,  payments of principal and other payments with respect to the securities
held hereunder, and in connection therewith to deliver the certificates or other
instruments  representing the securities to the issuer thereof or its agent when
securities are called, redeemed,  retired or otherwise become payable; provided,
that the  payment is to be made in such form and manner and at such time,  which
may be after  delivery  by the  Custodian  of the  instrument  representing  the
security, as is in accordance with the terms of the instrument  representing the
security,  or  such  proper  instructions  as  the  Custodian  may  receive,  or
governmental  regulations,  the  rules  of  Securities  Systems  or  other  U.S.
securities  depositories  and clearing  agencies or, with respect to  securities


                                       6
<PAGE>

referred to in clause  (iii) of the last  sentence of Section 2D, in  accordance
with generally  accepted  trade  practice;  (ii) to execute  ownership and other
certificates and affidavits for all federal and state tax purposes in connection
with receipt of income or other  payments with respect to securities of the Fund
or in  connection  with  transfer of  securities,  and (iii)  pursuant to proper
instructions to take such other actions with respect to collection or receipt of
funds or transfer of securities which involve an investment decision.

Q.   Dividends,   Distributions   and  Redemptions  -  Upon  receipt  of  proper
instructions  from the Fund,  or upon  receipt of  instructions  from the Fund's
shareholder  servicing agent or agent with comparable  duties (the  "Shareholder
Servicing  Agent") (given by such person or persons and in such manner on behalf
of the  Shareholder  Servicing  Agent as the Fund  shall have  authorized),  the
Custodian shall release funds or securities to the  Shareholder  Servicing Agent
or otherwise apply funds or securities, insofar as available, for the payment of
dividends or other  distributions to Fund  shareholders.  Upon receipt of proper
instructions from the Fund, or upon receipt of instructions from the Shareholder
Servicing Agent (given by such person or persons and in such manner on behalf of
the  Shareholder  Servicing  Agent  as the  Fund  shall  have  authorized),  the
Custodian  shall  release  funds or  securities,  insofar as  available,  to the
Shareholder  Servicing  Agent or as such  Agent  shall  otherwise  instruct  for
payment to Fund  shareholders  who have  delivered  to such Agent a request  for
repurchase or redemption of their shares of capital stock of the Fund.

R. Proxies, Notices, Etc. - Promptly to deliver or mail to the Fund all forms of
proxies  and all  notices of  meetings  and any other  notices or  announcements
affecting or relating to  securities  owned by the Fund that are received by the
Custodian,  and upon receipt of proper  instructions,  to execute and deliver or
cause its nominee to execute and deliver such proxies or other authorizations as
may be required.  Neither the  Custodian  nor its nominee shall vote upon any of
such securities or execute any proxy to vote thereon or give any consent or take
any other action with respect  thereto  (except as  otherwise  herein  provided)
unless ordered to do so by proper instructions.

S.  Nondiscretionary  Details - Without the  necessity of express  authorization
from the Fund, (1) to attend to all nondiscretionary  details in connection with
the sale,  exchange,  substitution,  purchase,  transfer or other  dealings with
securities,  funds or other  property  of the  Portfolio  held by the  Custodian
except as otherwise  directed  from time to time by the Directors or Trustees of


                                       7
<PAGE>

the Fund,  and (2) to make  payments  to itself or others for minor  expenses of
handling  securities or other similar items relating to the  Custodian's  duties
under this Agreement,  provided that all such payments shall be accounted for to
the Fund.

T.  Bills - Upon  receipt  of proper  instructions,  to pay or cause to be paid,
insofar as funds are  available for the purpose,,  bills,  statements,  or other
obligations of the Fund.

U.  Deposit of Fund Assets in  Securities  Systems - The  Custodian  may deposit
and/or  maintain  securities  owned  by the  Fund  in (i) The  Depository  Trust
Company,  (ii) any  book-entry  system as  provided  in  Subpart  0 of  Treasury
Circular  No. 300, 31 CFR 306,  Subpart B of 31 CFR Part 350, or the  book-entry
regulations of federal agencies substantially in the form of Subpart 0, or (iii)
any other domestic  clearing agency  registered with the Securities and Exchange
Commission  under Section 17A of the Securities  Exchange Act of 1934 which acts
as a securities  depository  and whose use the Fund has  previously  approved in
writing  (each  of the  foregoing  being  referred  to in  this  Agreement  as a
"Securities System").  Utilization of a Securities System shall be in accordance
with  applicable  Federal  Reserve Board and Securities and Exchange  Commission
rules and regulations, if any, and subject to the following provisions:

1) The Custodian may deposit and/or maintain Fund securities, either directly or
through one or more Agents  appointed by the Custodian  (provided  that any such
agent  shall be  qualified  to act as a  custodian  of the Fund  pursuant to the
Investment Company Act of 1940 and the rules and regulations  thereunder),  in a
Securities  System  provided that such  securities are represented in an account
("Account") of the Custodian or such Agent in the Securities  System which shall
not  include  any assets of the  Custodian  or Agent other than assets held as a
fiduciary, custodian, or otherwise for customers;

2) The records of the Custodian with respect to securities of the Fund which are
maintained in a Securities  System shall identify by book-entry those securities
belonging to the Fund;

3) The Custodian shall pay for securities  purchased for the account of the Fund
upon (i) receipt of advice from the Securities  System that such securities have
been transferred to the Account,  and (ii) the making of an entry on the records
of the  Custodian  to reflect  such  payment and transfer for the account of the


                                       8
<PAGE>

Fund. The Custodian  shall transfer  securities sold for the account of the Fund
upon (i) receipt of advice  from the  Securities  System  that  payment for such
securities has been transferred to the Account,  and (ii) the making of an entry
on the records of the  Custodian  to reflect  such  transfer and payment for the
account  of the  Fund.  Copies  of all  advices  from the  Securities  System of
transfers of securities  for the account of the Fund shall identify the Fund, be
maintained  for the Fund by the Custodian or an Agent as referred to above,  and
be provided to the Fund at its request.  The  Custodian  shall  furnish the Fund
confirmation  of each transfer to or from the account of the Fund in the form of
a written  advice  or  notice  and  shall  furnish  to the Fund  copies of daily
transaction  sheets reflecting each day's  transactions in the Securities System
for the account of the Fund on the next business day;

4) The  Custodian  shall  provide  the Fund  with  any  report  obtained  by the
Custodian  or  any  Agent  as  referred  to  above  on the  Securities  System's
accounting system,  internal  accounting control and procedures for safeguarding
securities deposited in the Securities System; and the Custodian and such Agents
shall send to the Fund such reports on their own systems of internal  accounting
control as the Fund may reasonably request from time to time.

5) At the written  request of the Fund,  the Custodian will terminate the use of
any such Securities System on behalf of the Fund as promptly as practicable.

V. Other Transfers - Upon receipt of proper instructions, to deliver securities,
funds and other property of the Fund to a Subcustodian  or another  custodian of
the  Fund;  and,  upon  receipt  of  proper  instructions,  to make  such  other
disposition of securities, funds or other property of the Fund in a manner other
than or for  purposes  other than as  enumerated  elsewhere  in this  Agreement,
provided  that the  instructions  relating to such  disposition  shall include a
statement  of the  purpose for which the  delivery is to be made,  the amount of
securities  to be  delivered  and the  name of the  person  or  persons  to whom
delivery is to be made.

W.  Investment  Limitations  - In  performing  its  duties  generally,  and more
particularly  in connection  with the purchase,  sale and exchange of securities
made by or for the Fund,  the Custodian may assume unless and until  notified in
writing to the  contrary  that  proper  instructions  received  by it are not in
conflict with or in any way contrary to any provisions of the Fund's Declaration
of Trust or Certificate of Incorporation or By-Laws (or comparable documents) or


                                       9
<PAGE>

votes or proceedings of the shareholders or Directors of the Fund. The Custodian
shall in no event be liable to the Fund and shall be indemnified by the Fund for
any violation which occurs in the course of carrying out  instructions  given by
the Fund of any  investment  limitations  to which the Fund is  subject or other
limitations  with respect to the Fund's  powers to make  expenditures,  encumber
securities, borrow or take similar actions affecting the Fund.

X. Proper  Instructions - Proper instructions shall mean a tested telex from the
Fund or a written request,  direction,  instruction or  certification  signed or
initialled  on behalf of the Fund by one or more  person or persons as the Board
of  Directors  or Trustees of the Fund shall have from time to time  authorized,
provided,   however,  that  no  such  instructions  directing  the  delivery  of
securities or the payment of funds to an authorized  signatory of the Fund shall
be signed by such person.  Those persons authorized to give proper  instructions
may be  identified  by the Board of  Directors  or  Trustees  by name,  title or
position  and will  include at least one officer  empowered by the Board to name
other  individuals  who are authorized to give proper  instructions on behalf of
the Fund.  Telephonic or other oral  instructions  given by any one of the above
persons will be  considered  proper  instructions  if the  Custodian  reasonably
believes  them  to  have  been  given  by  a  person  authorized  to  give  such
instructions with respect to the transaction involved. Oral instructions will be
confirmed  by tested  telex or in writing in the manner set forth  above but the
lack of such  confirmation  shall  in no way  affect  any  action  taken  by the
Custodian  in reliance  upon such oral  instructions.  The Fund  authorizes  the
Custodian to tape record any and all telephonic or other oral instructions given
to the  Custodian by or on behalf of the Fund  (including  any of its  officers,
Directors,  Trustees,  employees or agents) and will deliver to the  Custodian a
similar authorization from any investment manager or adviser or person or entity
with similar  reponsibilities which is authorized to give proper instructions on
behalf of the Fund to the Custodian.  Proper instructions may relate to specific
transactions or to types or classes of  transactions,  and may be in the form of
standing instructions.

Proper  instructions  may  include  communications   effected  directly  between
electromechanical or electronic devices or systems, in addition to tested telex,
provided  that the Fund and the  Custodian  agree to the use of such  device  or
system.

Y. Segregated Account - The Custodian shall upon receipt of proper  instructions
establish and maintain on its books a segregated  account or accounts for and on


                                       10
<PAGE>

behalf of the Fund,  into which  account or  accounts  may be  transferred  cash
and/or securities of the Fund, including securities  maintained by the Custodian
pursuant to Section 2U hereof,  (i) in  accordance  with the  provisions  of any
agreement among the Fund, the Custodian and a broker-dealer registered under the
Securities  Exchange  Act of 1934 and a member of the  National  Association  of
Securities  Dealers,  Inc. (or any futures commission  merchant registered under
the Commodity Exchange Act) relating to compliance with the rules of the Options
Clearing  Corporation and of any registered national securities exchange (or the
Commodity Futures Trading Commission or any registered  contract market), or any
similar organization or organizations, regarding escrow or other arrangements in
connection with  transactions by the Fund, (ii) for purposes of segregating cash
or securities in connection with options purchased,  sold or written by the Fund
or commodity futures contracts or options thereon purchased or sold by the Fund,
(iii) for the purposes of compliance by the Fund with the procedures required by
Investment  Company Act Release No. 10666, or any subsequent release or releases
of the  Securities  and  Exchange  Commission  relating  to the  maintenance  of
segregated  accounts by registered  investment  companies,  and (iv) as mutually
agreed from time to time between the Fund and the Custodian.

3.  Powers and  Duties of the  Custodian  with  Respect  to the  Appointment  of
Subcustodians:  The Fund hereby  authorizes  and instructs the Custodian to hold
securities,  funds and other property of the Fund which are  maintained  outside
the United States at subcustodians  appointed pursuant to the provisions of this
Section  3 (a  "Subcustodian").  The  Fund  shall  approve  in  writing  (1) the
appointment of each  Subcustodian and the  subcustodian  agreement to be entered
into between such Subcustodian and the Custodian, and (2) if the Subcustodian is
organized under the laws of a country other than the United States,  the country
or countries in which the  Subcustodian is authorized to hold  securities,  cash
and other property of the Fund. The Fund hereby further authorizes and instructs
the  Custodian  and any  Subcustodian  to utilize such  securities  depositories
located  outside the United  States which are approved in writing by the Fund to
hold securities,  cash and other property of the Fund. Upon such approval by the
Fund,  the  Custodian  is  authorized  on  behalf  of the  Fund to  notify  each
Subcustodian  of its  appointment as such. The Custodian may, at any time in its
discretion,  remove any  Subcustodian  that has been  appointed as such but will
promptly notify the Fund of any such action.

Those  Subcustodians,  and the countries  where and the securities  depositories
through which they or the Custodian may hold securities, cash and other property


                                       11
<PAGE>

of the Fund  which the Fund has  approved  to date are set forth on  Appendix  A
hereto.  Such  Appendix  shall be  amended  from time to time as  Subcustodians,
and/or countries and/or securities  depositories are changed,  added or deleted.
The Fund shall be  responsible  for  informing  the  Custodian  sufficiently  in
advance of a proposed  investment which is to be held in a country not listed on
Appendix  A, in order that there shall be  sufficient  time for the Fund to give
the approval  required by the  preceding  paragraph and for the Custodian to put
the  appropriate  arrangements  in  place  with  such  Subcustodian,   including
negotiation  of a  subcustodian  agreement and  submission of such  subcustodian
agreement to the Fund for approval.

If the Fund shall have invested in a security to be held in a country before the
foregoing  procedures have been  completed,  such security shall be held by such
agent as the Custodian may appoint.  In any event, the Custodian shall be liable
to the  Fund  for the  actions  of such  agent  if and  only to the  extent  the
Custodian  shall have  recovered from such agent for any damages caused the Fund
by such  agent.  At the  request  of the Fund,  Custodian  agrees to remove  any
securities  held on  behalf  of the  Fund by such  agent,  if  practical,  to an
approved  Subcustodian.  Under such circumstances  Custodian will collect income
and respond to corporate actions on a best efforts basis.

With respect to securities and funds held by a Subcustodian,  either directly or
indirectly   (including  by  a  securities   depository  or  clearing   agency),
notwithstanding  any provision of this  Agreement to the  contrary,  payment for
securities  purchased  and  delivery  of  securities  sold may be made  prior to
receipt of the  securities or payment,  respectively,  and securities or payment
may be received in a form, in accordance with governmental regulations, rules of
securities  depositories  and clearing  agencies,  or generally  accepted  trade
practice in the applicable local market.

In the event that any Subcustodian  appointed pursuant to the provisions of this
Section 3 fails to perform any of its obligations under the terms and conditions
of the  applicable  subcustodian  agreement,  the  Custodian  shall use its best
efforts to cause such  Subcustodian  to perform such  obligations.  In the event
that the  Custodian is unable to cause such  Subcustodian  to perform  fully its
obligations  thereunder,  the Custodian  shall forthwith upon the Fund's request
terminate such Subcustodian in accordance with the termination  provisions under
the applicable  subcustodian  agreement and, if necessary or desirable,  appoint
another subcustodian in accordance with the provisions of this Section 3. At the


                                       12
<PAGE>

election  of the  Fund,  it shall  have  the  right to  enforce,  to the  extent
permitted by the  subcustodian  agreement and  applicable  law, the  Custodian's
rights against any such  Subcustodian for loss or damage caused the Fund by such
Subcustodian.

The Custodian  will not amend any  subcustodian  agreement or agree to change or
permit any  changes  thereunder  except upon the prior  written  approval of the
Fund.

The Custodian may, at any time in its discretion upon  notification to the Fund,
terminate  any  Subcustodian  of the Fund in  accordance  with  the  termination
provisions  under the  applicable  Subcustodian  Agreement,  and at the  written
request of the Fund, the Custodian will terminate any Subcustodian in accordance
with the termination provisions under the applicable Subcustodian Agreement.

If necessary or desirable,  the Custodian may appoint  another  subcustodian  to
replace a Subcustodian  terminated pursuant to the foregoing  provisions of this
Section  3,  such  appointment  to  be  made  upon  approval  of  the  successor
subcustodian by the Fund's Board of Directors or Trustees in accordance with the
provisions of this Section 3.

In the  event the  Custodian  receives  a claim  from a  Subcustodian  under the
indemnification  provisions of any subcustodian  agreement,  the Custodian shall
promptly give written notice to the Fund of such claim. No more than thirty days
after  written  notice  to the Fund of the  Custodian's  intention  to make such
payment, the Fund will reimburse the Custodian the amount of such payment except
in respect of any negligence or misconduct of the Custodian.

4. Assistance by the Custodian as to Certain  Matters:  The Custodian may assist
generally in the preparation of reports to Fund shareholders and others,  audits
of accounts, and other ministerial matters of like nature.

5.  Powers and Duties of the  Custodian  with  Respect to its Role as  Financial
Agent: The Fund hereby also appoints the Custodian as the Funds financial agent.
With respect to the appointment as financial agent, the Custodian shall have and
perform the following powers and duties:

A.  Records - To  create,  maintain  and retain  such  records  relating  to its
activities  and  obligations  under this  Agreement  as are  required  under the


                                       13
<PAGE>

Investment  Company  Act of  1940  and  the  rules  and  regulations  thereunder
(including  Section 31 thereof and Rules 3la-1 and 3la-2  thereunder)  and under
applicable  Federal and State tax laws. All such records will be the property of
the Fund and in the event of termination of this Agreement shall be delivered to
the successor custodian.

B. Accounts - To keep books of account and render statements,  including interim
monthly and complete quarterly  financial  statements,  or copies thereof,  from
time to time as reasonably requested by proper instructions.

C.  Access  to  Records  - The books and  records  maintained  by the  Custodian
pursuant to Sections 5A and 5B shall at all times during the Custodian's regular
business hours be open to inspection and audit by officers of, attorneys for and
auditors  employed by the Fund and by employees and agents of the Securities and
Exchange  Commission,  provided  that all such  individuals  shall  observe  all
security  requirements of the Custodian  applicable to its own employees  having
access to similar  records  within the Custodian and such  regulations as may be
reasonably imposed by the Custodian.

D.  Disbursements - Upon receipt of proper  instructions,  to pay or cause to be
paid,  insofar as funds are available  for the purpose,  bills,  statements  and
other  obligations of the Fund  (including but not limited to interest  charges,
taxes, management fees,  compensation to Fund officers and employees,  and other
operating expenses of the Fund).

6.       Standard of Care and Related Matters:

A. Liability of the Custodian with Respect to Proper  Instructions;  Evidence of
Authority,  Etc. - The  Custodian  shall not be liable  for any action  taken or
omitted in  reliance  upon proper  instructions  believed by it to be genuine or
upon any other written notice, request, direction,  instruction,  certificate or
other instrument  believed by it to be genuine and signed by the proper party or
parties.  The Secretary or Assistant  Secretary of the Fund shall certify to the
Custodian the names, signatures and scope of authority of all persons authorized
to give  proper  instructions  or any other  such  notice,  request,  direction,
instruction,  certificate  or  instrument  on behalf of the Fund,  the names and
signatures of the officers of the Fund, the name and address of the  Shareholder
Servicing Agent, and any resolutions,  votes,  instructions or directions of the
Fund's Board of Directors or Trustees or  shareholders.  Such certificate may be


                                       14
<PAGE>

accepted and relied upon by the  Custodian as  conclusive  evidence of the facts
set forth  therein and may be  considered in full force and effect until receipt
of a similar certificate to the contrary.

So long as and to the extent that it is in the exercise of reasonable  care, the
Custodian shall not be responsible for the title, validity or genuineness of any
property or evidence of title thereto received by it or delivered by it pursuant
to this Agreement.

The Custodian shall be entitled,  at the expense of the Fund, to receive and act
upon advice of (i) counsel  regularly  retained by the  Custodian  in respect of
custodian matters, (ii) counsel for the Fund, or (iii) such other counsel as the
Fund and the  Custodian  may agree upon,  with respect to all  matters,  and the
Custodian shall be without  liability for any action reasonably taken or omitted
pursuant to such advice.

B.  Liability of the Custodian  with Respect to Use of Securities  System - With
respect to the portfolio securities, cash and other property of the Fund held by
a Securities System, the Custodian shall be liable to the Fund only for any loss
or damage to the Fund resulting  from use of the Securities  System if caused by
any negligence,  misfeasance or misconduct of the Custodian or any of its agents
or of any of its or their  employees or from any failure of the Custodian or any
such  agent to  enforce  effectively  such  rights  as it may have  against  the
Securities  System.  At the  election  of the Fund,  it shall be  entitled to be
subrogated to the rights of the Custodian  with respect to any claim against the
Securities  System  or any  other  person  which  the  Custodian  may  have as a
consequence of any such loss or damage to the Fund if and to the extent that the
Fund has not been made whole for any such loss or damage.

C. Liability of the Custodian with respect to Subcustodians  The Custodian shall
be liable to the Fund for any loss or damage to the Fund caused by or  resulting
from the acts or  omissions  of any  Subcustodian  to the extent  that under the
terms set forth in the  subcustodian  agreement  between the  Custodian  and the
Subcustodian  (or in the subcustodian  agreement  between a Subcustodian and any
secondary Subcustodian), the Subcustodian (or secondary Subcustodian) has failed
to  perform in  accordance  with the  standard  of  conduct  imposed  under such
subcustodian  agreement  as  determined  in  accordance  with  the law  which is
adjudicated to govern such agreement and in accordance with any determination of
any court as to the duties of said Subcustodian pursuant to said agreement.  The


                                       15
<PAGE>

Custodian  shall  also  be  liable  to  the  Fund  for  its  own  negligence  in
transmitting  any  instructions  received  by it from  the  Fund and for its own
negligence in connection with the delivery of any securities or funds held by it
to any Subcustodian.

D. Standard of Care;  Liability;  Indemnification  - The Custodian shall be held
only to the  exercise of  reasonable  care and  diligence  in  carrying  out the
provisions of this Agreement,,  provided that the Custodian shall not thereby be
required to take any action which is in contravention of any applicable law.
 The Fund agrees to indemnify  and hold  harmless the Custodian and its nominees
from all claims and  liabilities  (including  counsel fees) incurred or assessed
against it or its nominees in connection with the performance of this Agreement,
except  such as may  arise  from its or its  nominee's  breach  of the  relevant
standard of conduct set forth in this Agreement.  Without limiting the foregoing
indemnification  obligation  of the  Fund,  the Fund  agrees  to  indemnify  the
Custodian and any nominee in whose name  portfolio  securities or other property
of the Fund is  registered  against any  liability the Custodian or such nominee
may incur by reason of taxes  assessed to the Custodian or such nominee or other
costs,  liability or expense incurred by the Custodian or such nominee resulting
directly or indirectly from the fact that portfolio securities or other property
of the Fund is registered  in the name of the  Custodian or such nominee.  It is
also  understood  that the Custodian  shall not be liable for any loss involving
any  securities,  currencies,  deposits or other  property of the Fund,  whether
maintained  by it, a  Subcustodian,  a  securities  depository,  an agent of the
Custodian or a Subcustodian,  a Securities System, or a Banking Institution,  or
for any loss arising from a foreign currency transaction or contract,  where the
loss  results  from a  Sovereign  Risk or  where  the  entity  maintaining  such
securities,  currencies,  deposits or other  property  of the Fund,  whether the
Custodian, a Subcustodian, a securities depository, an agent of the Custodian or
a  Subcustodian,  a Securities  System or a Banking  Institution,  has exercised
reasonable care  maintaining such property or in connection with the transaction
involving  such  property.  A  "Sovereign  Risk"  shall  mean   nationalization,
expropriation,  devaluation,  revaluation,  confiscation, seizure, cancellation,
destruction  or similar  action by any  governmental  authority,  de facto or de
jure;  or  enactment,  promulgation,  imposition  or  enforcement  by  any  such
governmental  authority  of currency  restrictions,  exchange  controls,  taxes,
levies  or  other  charges  affecting  the  Fund's  property;  or  acts  of war,
terrorism,  insurrection  or  revolution;  or any other act or event  beyond the
Custodian's control.


                                       16
<PAGE>

E.  Reimbursement  of  Advances - The  Custodian  shall be  entitled  to receive
reimbursement  from the Fund on demand, in the manner provided in Section 7, for
its cash disbursements, expenses and charges (including the fees and expenses of
any Subcustodian or any Agent) in connection with this Agreement,  but excluding
salaries and usual overhead expenses.

F.  Security  for  Obligations  to  Custodian  - If the Fund shall  require  the
Custodian to advance cash or  securities  for any purpose for the benefit of the
Fund,  including  in  connection  with  foreign  exchange  contracts  or options
(collectively,  an "Advance"),  or if the Custodian or any nominee thereof shall
incur or be  assessed  any  taxes,  charges,  expenses,  assessments,  claims or
liabilities in connection with the performance of this Agreement (collectively a
"Liability"),  except such as may arise from its or such nominee's breach of the
relevant standard of conduct set forth in this Agreement, then in such event any
property  at any time held for the  account  of the Fund by the  Custodian  or a
Subcustodian  shall be security for such  Advance or  Liability  and if the Fund
shall fail to repay or indemnify the Custodian promptly,  the Custodian shall be
entitled  to utilize  available  cash and to  dispose  of the  Fund's  property,
including  securities,  to the  extent  necessary  to  obtain  reimbursement  or
indemnification.

G.  Appointment  of  Agents  - The  Custodian  may at any  time or  times in its
discretion  appoint (and may at any time remove) any other bank or trust company
as its agent (an "Agent") to carry out such of the  provisions of this Agreement
as the  Custodian  may from time to time  direct,  provided,  however,  that the
appointment of such Agent (other than an Agent  appointed  pursuant to the third
paragraph  of  Section  3)  shall  not  relieve  the  Custodian  of  any  of its
responsibilities under this agreement.

H. Powers of Attorney - Upon  request,  the Fund shall  deliver to the Custodian
such proxies,  powers of attorney or other  instruments as may be reasonable and
necessary or desirable in connection  with the  performance  by the Custodian or
any  Subcustodian of their  respective  obligations  under this Agreement or any
applicable subcustodian agreement.

7. Compensation of the Custodian: The Fund shall pay the Custodian a custody fee
based on such fee schedule as may from time to time be agreed upon in writing by
the  Custodian and the Fund.  Such fee,  together with all amounts for which the
Custodian is to be reimbursed in accordance  with Section 6D, shall be billed to
the Fund in such a manner as to permit  payment by a direct cash  payment to the
Custodian.


                                       17
<PAGE>

8. Termination; Successor Custodian: This Agreement shall continue in full force
and  effect  until  terminated  by  either  party by an  instrument  in  writing
delivered or mailed,  postage prepaid,  to the other party,  such termination to
take  effect  not  sooner  than  seventy  five (75) days  after the date of such
delivery or mailing. In the event of termination the Custodian shall be entitled
to receive prior to delivery of the securities, funds and other property held by
it  all  accrued  fees  and  unreimbursed  expenses  the  payment  of  which  is
contemplated  by  Sections  6D and 7, upon  receipt  by the Fund of a  statement
setting forth such fees and expenses.

In the event of the appointment of a successor custodian,  it is agreed that the
funds  and  securities  owned  by the  Fund  and  held by the  Custodian  or any
Subcustodian  shall be delivered to the successor  custodian,  and the Custodian
agrees to cooperate  with the Fund in execution of documents and  performance of
other  actions  necessary  or  desirable in order to  substitute  the  successor
custodian for the Custodian under this Agreement.

9. Amendment:  This Agreement constitutes the entire understanding and agreement
of the parties hereto with respect to the subject matter hereof. No provision of
this  Agreement  may be amended or  terminated  except by a statement in writing
signed by the party against which enforcement of the amendment or termination is
sought.

In connection with the operation of this  Agreement,  the Custodian and the Fund
may agree in writing from time to time on such provisions  interpretative  of or
in addition to the provisions of this Agreement as may in their joint opinion be
consistent  with the  general  tenor of this  Agreement.  No  interpretative  or
additional provisions made as provided in the preceding sentence shall be deemed
to be an amendment of this Agreement.

The section  headings in this  Agreement are for the  convenience of the parties
and in no way alter, amend, limit or restrict the contractual obligations of the
parties set forth in this Agreement.

10. Governing Law: This instrument is executed and delivered in The Commonwealth
of Massachusetts and shall be governed by and construed according to the laws of
said Commonwealth.

11. Notices:  Notices and other writings  delivered or mailed postage prepaid to
the Fund addressed to the Fund at 60 State Street,  Boston,  Massachusetts 02109


                                       18
<PAGE>

or to such other  address as the Fund may have  designated  to the  Custodian in
writing, or to the Custodian at 40 Water Street,  Boston,  Massachusetts  02109,
Attention:  Manager,  Securities  Department,  or to such  other  address as the
Custodian may have  designated  to the Fund in writing,  shall be deemed to have
been properly delivered or given hereunder to the respective addressee.

12. Binding  Effect:  This Agreement  shall be binding on and shall inure to the
benefit  of the Fund and the  Custodian  and  their  respective  successors  and
assigns,  provided that neither party hereto may assign this Agreement or any of
its rights or  obligations  hereunder  without the prior written  consent of the
other party.

13. Counterparts:  This Agreement may be executed in any number of counterparts,
each of which shall be deemed an original. This Agreement shall become effective
when one or more  counterparts  have been  signed and  delivered  by each of the
parties.

<PAGE>






IN WITNESS WHEREOF, each of the parties has caused this Agreement to be executed
in its name and behalf on the day and year first above written.





PIONEER U. S. GOVERNMENT TRUST          BROWN BROTHERS HARRIMAN
                                        & CO.





By _________________________            per pro
- --------------------



                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent  public  accountants,  we hereby consent to the use of our report
(and to all  references  to our firm)  included in or made a part of the Pioneer
America Income Trust  Post-Effective  Amendment No. 9 to Registration  Statement
File No.  33-20795  and  Amendment  No. 10 to  Registration  Statement  File No.
811-5516.




                                          ARTHUR ANDERSEN LLP




Boston, Massachusetts
April 20, 1995



 
DEAR SHAREOWNERS,
- -------------------------------------------------------------------------------
Pioneer America Income Trust closed its seventh fiscal year on December 31,
1994. Over the past year, bond investors witnessed economic growth and, with
it, the threat of rising inflation. These events pushed up interest rates, re-
sulting in price declines for most bonds, including those that make up your
Fund.
 
                            HOW YOUR FUND PERFORMED
For the 12 months ended December 31, 1994, we report the following:
 
. Class A shares --The Fund paid daily dividends totaling $0.66 per share dur-
  ing the fiscal year. The Fund's 30-day SEC yield was 6.75% as of December
  31, 1994. This yield is based on a standard formula prescribed by the Secu-
  rities and Exchange Commission./1/ Net asset value stood at $9.41 per share,
  versus $10.48 one year ago. The Fund's one-year total return was -3.97%
  based on net asset value and assuming the reinvestment of distributions.
 
. Class B shares --The Fund paid shareowners a total of $0.40 per share in
  dividends since it was introduced April 29, 1994. As of December 31, 1994,
  the Fund's 30-day SEC yield was 6.34%. This yield was calculated by
  annualizing the most recent dividend payment./1/ Net asset value stood at
  $9.40 per share, versus $9.85 on April 29. The Fund's total return for the
  period was -0.57% assuming shares were held throughout the period and dis-
  tributions were reinvested.
 
Pioneer America Income Trust's 12-month total return outpaced its peers, ac-
cording to Lipper Analytical Services, an independent mutual fund research
firm. For the year ended December 31, 1994, the average return in the general
U.S. government fund universe was -4.63%. Lipper tracked 145 funds for the pe-
riod.
 
For additional performance information, please turn to page 3.
 
                    STRIVING FOR INCOME, RELATIVE STABILITY
                          IN A DIFFICULT BOND MARKET
Your Fund is designed to provide shareowners with high current income from a
high-quality portfolio. The Fund only invests in securities issued by the U.S.
government or selected federal agencies. All of the Fund's holdings carry the
government's "full faith and credit" backing, which guarantees that all of the
Fund's holdings will pay interest and principal payments on time and in whole.
Of course, the guarantee does not extend to the price or yield of Fund shares.
 
Over the past year, however, prices of all qualities of bonds fell to levels
investors had not seen in some time. This occurred as a result of the Federal
Reserve's (the Fed) decision to raise short-term interest rates. Strong eco-
nomic data for the last quarter of 1993, coupled with historically low inter-
est rates of 3%, prompted the Fed to raise the federal funds rate (the rate
member banks charge one another for overnight loans) in an attempt to slow
growth and restrict inflation. The first increase came in February, with addi-
tional jumps coming in March, April, May, August, and November. This brought
the federal funds rate to a three-year high of 5.5%. (On February 1, the Fed
acted again, lifting short-term interest rates to 6%.) While the Fed hoped
these rate hikes would quell inflationary fears, continued economic growth and
investor uncertainty about even higher interest rate movement created volatil-
ity within financial markets worldwide.
 
In order to minimize your Fund's exposure to the declines in bond prices, your
management reduced the Fund's exposure to long-term bonds over the course of
the year. By December 31, the Fund held no securities with a maturity greater
than 12 years. Instead, the bulk of securities had maturities ranging from
two-to-five years (29%) or seven-to-10 years (26%). Overall, the portfolio had
an average maturity of approximately six years at the close of 1994. Bonds in
this maturity range, while unable to avoid the price declines that occurred in
almost all government securities (regardless of maturity), provided greater
liquidity and less volatility than their longer-term counterparts. At the same
time, this maturity range worked to enhance the Fund's income stream, which
increased slightly as interest rates rose throughout the year.


/1/ The Fund's manager voluntarily waived a portion of its management fee;
 otherwise the SEC yields for Class A shares and Class B shares would have
 been 6.69% and 6.28%, respectively.
<PAGE>
 
 
 
                           [PIE CHART APPEARS HERE]


                   YEARS                              PERCENTAGE
                   -----                              ----------
                    2-5                                   29%
                    7-10                                  26%
                   10-12                                  19%
                    5-7                                   15%
                    0-2                                   11%


 
Your management also actively allocates the Fund's holdings between government
and agency issues. As of December 31, 1994, Treasury obligations accounted for
66% of the portfolio, with 34% in U.S. government agencies. This conservative
focus provides investors with a sense of security in knowing that the Fund
chooses only high-quality investments and that management will not subject the
Fund to riskier, more exotic investments.
 
                                 LOOKING AHEAD
In 1994, investors saw interest rates move to their highest levels in three
years. And while fixed-income investors are aware that bond prices move in the
opposite direction of interest rates, the unavoidable relationship nonetheless
frightened many investors, causing emotions to enter the market. As debate
lingers about whether the Fed will raise rates further, the fact remains that
the past year was disappointing for the overall bond market. On a more posi-
tive note, the economy (despite conflicting signs) does appear to be cooling,
which leads to optimism that the biggest increases in interest rates may be
behind us.
 
Your Fund's management remains committed to monitoring and adjusting Pioneer
America Income Trust's portfolio to adapt to these changing conditions. We
think the Fund's holdings with less than 10 years to maturity should remain
helpful in reducing volatility and generating a solid stream of current in-
come. And, as always, shareowners should continue to take comfort in the
Fund's strategy of investing in bonds that carry the U.S. government's guaran-
tee.
 
As a final note, we once again would like to welcome shareowners from Pioneer
America Fund, as well as the Fund's new shareowners, to the newly named Pio-
neer America Income Trust. We are confident that your Fund will continue its
tradition of providing current income and capital preservation.
 
Please read on through the following pages, which provide the audited schedule
of investments and financial statements. If you have any questions about your
investment in Pioneer America Income Trust, please contact your investment
representative, or call Pioneer at 1-800-225-6292.
 
Respectfully,
 
/s/ John F. Cogan, Jr.

John F. Cogan, Jr.
Chairman and President,
Pioneer America Income Trust
 
February 10, 1995
 
                                       2
<PAGE>
 
                        GROWTH OF A $10,000 INVESTMENT*
 
This chart shows the growth of a $10,000 investment made in Pioneer America
Income Trust (Class A) at public offering price, compared to the growth of the
Lehman Government Bond Index.+
 
 
                             [GRAPH APPEARS HERE]

PIONEER AMERICA INCOME TRUST
(CLASS A)
Average Annual Total Returns
(as of December 31, 1994)

                                      Life of
                                       Fund
                           1 year     (6/1/88)
                           ------     --------
Net Asset Value            -3.97%       7.20%
Public Offering Price*     -8.26        6.45


               Pioneer America
            Income Trust (Class A)        Lehman Government Bond Index
            ----------------------        ----------------------------

 6/88+           $ 9,550                           $10,000
12/88              9,799                            10,265
 6/89             10,439                            11,208
12/89             10,926                            11,725
 6/90             11,283                            11,985
12/90             11,909                            12,747
 6/91             12,385                            13,199
12/91             13,354                            14,700
 6/92             13,731                            15,014
12/92             14,246                            15,762
 6/93             15,197                            16,951
12/93             15,538                            17,442
 6/94             14,871                            16,724
12/94             14,921                            16,853 
 

* Reflects deduction of the maximum 4.5% sales charge at the beginning of the
  period and assumes reinvestment of all distributions at net asset value.
 
+ Index comparisons begin June 30, 1988.
 
  The Lehman Government Bond Index is an unmanaged measure of public
  obligations of the U.S. Treasury, all publicly issued debt of U.S. government
  agencies and quasi-federal corporations, and corporate debt guaranteed by the
  U.S. government.
 
  Past performance does not guarantee future results. Returns would have been
  lower without the manager's voluntary fee waiver. Share price and return
  fluctuate and your shares, when redeemed, may be worth more or less than
  their original cost.
 
                                       3
<PAGE>
 
                        GROWTH OF A $10,000 INVESTMENT**
 
This chart shows the growth of a $10,000 investment made in Pioneer America
Income Trust (Class B), compared to the growth of the Lehman Government Bond
Index.+
 
 
                             [GRAPH APPEARS HERE]


PIONEER AMERICA INCOME TRUST (CLASS B)
Average Annual Total Returns
(as of December 31, 1994)
                               Life of
                                fund
                              (4/29/94)
                              ---------
Returned If Not Redeemed       -0.57%
Return If Redeemed**           -4.39


               Pioneer America
            Income Trust (Class A)        Lehman Government Bond Index
            ----------------------        ----------------------------
 4/94+            $10,000                           $10,000
 5/94               9,986                             9,987
 6/94               9,952                             9,964
 7/94              10,113                            10,147
 8/94              10,121                            10,149
 9/94               9,978                            10,006
10/94               9,949                             9,999
11/94               9,898                             9,981
12/94               9,545                            10,041


 
** Reflects deduction of the maximum 4.0% Contingent Deferred Sales Charge at
   the end of the period and assumes reinvestment of all distributions at net
   asset value.
 
 + Index comparisons begin April 30, 1994.
 
   The Lehman Government Bond Index is an unmanaged measure of public
   obligations of the U.S. Treasury, all publicly issued debt of U.S. government
   agencies and quasi-federal corporations, and corporate debt guaranteed by the
   U.S. government.
 
   Past performance does not guarantee future results. Returns would have been
   lower without the manager's voluntary fee waiver. Share price and return
   fluctuate and your shares, when redeemed, may be worth more or less than
   their original cost.
 
                                       4
<PAGE>
 
 
 
                              PLEASE TURN PAGE FOR
                            SCHEDULE OF INVESTMENTS
 
                                       5
<PAGE>
 
SCHEDULE OF INVESTMENTS--PIONEER AMERICA INCOME TRUST--DECEMBER 31, 1994
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
  PRINCIPAL
   AMOUNT               INVESTMENT IN SECURITIES-98.8%                VALUE
- -------------------------------------------------------------------------------
 <C>         <S>                                                   <C>
             U.S. GOVERNMENT AGENCIES--33.3%
             Government National Mortgage Association
 $   162,473 GNMA Midget, 9.0%, 2004 to 2005....................   $    163,128
   1,074,475 GNMA Midget, 9.5%, 2003 to 2006....................      1,106,802
   1,650,427 GNMA Midget, 10.0%, 2001 to 2006...................      1,726,916
     263,969 GNMA Midget, 10.5%, 1998 to 2003...................        279,558
  16,500,000 GNMA REMIC Series, 94-1 PE, 7.5%, 2022.............     15,583,590
  14,749,550 GNMA, 8.0%, 2024...................................     14,491,432
  13,017,813 GNMA, 9.0%, 2016 to 2024...........................     13,029,226
     591,835 GNMA, 9.5%, 2019 to 2021...........................        603,598
   2,656,498 GNMA, 10.0%, 2016 to 2020..........................      2,789,626
     380,494 GNMA, 10.5%, 2017 to 2019..........................        406,283
                                                                   ------------
                                                                   $ 50,180,159
                                                                   ------------
             Other Government Agency Obligations
   4,275,000 Financial Assistance Corp., 9.45%, 2003............   $  4,451,344
                                                                   ------------
             Total U.S. Government Agencies (Cost $55,965,912)..   $ 54,631,503
                                                                   ------------
             U.S. GOVERNMENT SECURITIES--65.5%
     915,000 U.S. Treasury Bonds, 8.25%, 2005...................   $    917,571
   3,000,000 U.S. Treasury Bonds, 8.375%, 2008..................      3,062,820
   1,000,000 U.S. Treasury Bonds, 8.75%, 2008...................      1,044,840
   2,590,000 U.S. Treasury Bonds, 9.125%, 2009..................      2,773,735
   5,595,000 U.S. Treasury Bonds, 10.0%, 2010...................      6,375,670
   4,000,000 U.S. Treasury Bonds, 10.375%, 2009.................      4,643,760
   4,000,000 U.S. Treasury Notes, 7.5%, 2001....................      3,926,880
   6,000,000 U.S. Treasury Notes, 7.5%, 2002....................      5,889,360
   4,000,000 U.S. Treasury Notes, 7.75%, 2001...................      3,983,760
   2,000,000 U.S. Treasury Notes, 7.875%, 1998..................      2,001,880
   4,000,000 U.S. Treasury Notes, 7.875%, 2001..................      4,008,120
   7,500,000 U.S. Treasury Notes, 8.0%, 1996....................      7,539,825
     940,000 U.S. Treasury Notes, 8.0%, 1997....................        944,850
   5,990,000 U.S. Treasury Notes, 8.0%, 2001....................      6,036,782
   3,095,000 U.S. Treasury Notes, 8.25%, 1998...................      3,133,192
  14,485,000 U.S. Treasury Notes, 8.5%, 1997....................     14,699,957
   5,000,000 U.S. Treasury Notes, 8.5%, 1997....................      5,075,000
   6,000,000 U.S. Treasury Notes, 8.75%, 1997...................      6,135,000
   5,000,000 U.S. Treasury Notes, 8.875%, 2000..................      5,229,700
   3,750,000 U.S. Treasury Notes, 9.0%, 1998....................      3,875,963
   2,000,000 U.S. Treasury Notes, 9.25%, 1996...................      2,038,120
   3,000,000 U.S. Treasury Notes, 9.25%, 1998...................      3,130,320
   2,680,000 U.S. Treasury Notes, 9.375%, 1996..................      2,739,469
   2,255,000 U.S. Treasury Notes, 9.5%, 1995....................      2,299,401
     780,000 U.S. Treasury Notes, 10.375%, 1995.................        791,092
   2,775,000 U.S. Treasury Notes, 10.5%, 1995...................      2,834,829
   2,000,000 U.S. Treasury Notes, 10.75%, 2003..................      2,347,180
                                                                   ------------
             Total U.S. Government Securities (Cost
              $113,360,517).....................................   $107,479,076
                                                                   ------------
             TOTAL INVESTMENT IN SECURITIES (COST $169,326,429).   $162,110,579
                                                                   ------------
             ALL OTHER ASSETS, LESS LIABILITIES--1.2%...........   $  1,917,919
                                                                   ------------
             TOTAL NET ASSETS--100%.............................   $164,028,498
                                                                   ============
</TABLE>
 
Note: The Trust's investments in mortgage-backed securities of the Government
      National Mortgage Association (GNMA) are interests in separate pools of
      mortgages. All separate investments in this issuer which have the same
      coupon rate have been aggregated for the purpose of presentation in this
      schedule of investments.
 
                                       6
<PAGE>
 
BALANCE SHEET--DECEMBER 31, 1994
- --------------------------------------------------------------------------------
<TABLE>
<S>                                                                <C>
ASSETS:
  Investments in securities, at value (identified cost and cost
   for federal income tax purposes $169,326,429; see Schedule of
   Investments and Notes 1, 2 and 3).............................  $162,110,579
  Receivables--
  Interest.......................................................     2,350,168
  Trust shares sold..............................................       470,686
  Due from Pioneering Management Corporation (Note 4)............        19,778
  Other..........................................................        11,221
                                                                   ------------
   Total assets..................................................  $164,962,432
                                                                   ------------
LIABILITIES:
  Payables--
  Trust shares repurchased................... ...................  $    286,847
  Dividends......................................................       224,290
  Due to bank....................................................       229,696
  Other..........................................................        10,067
  Accrued expenses (Notes 4, 5 and 6)............................       183,034
                                                                   ------------
   Total liabilities.............................................  $    933,934
                                                                   ------------
NET ASSETS:
  Paid-in capital................................................  $176,605,523
  Accumulated undistributed net investment income (Note 2).......        52,709
  Accumulated net realized loss on investments (Note 2)..........    (5,413,884)
  Net unrealized loss on investments (Notes 1 and 2).............    (7,215,850)
                                                                   ------------
   Total net assets..............................................  $164,028,498
                                                                   ============
  NET ASSET VALUE PER SHARE:
   Class A--(based on $161,858,212/17,206,644 shares of benefi-
    cial interest outstanding--unlimited number of shares autho-
    rized).......................................................  $       9.41
                                                                   ============
   Class B--(based on $2,170,286/230,859 shares of beneficial
    interest outstanding--unlimited number of shares authorized).  $       9.40
                                                                   ============
  MAXIMUM OFFERING PRICE:
   Class A.......................................................  $       9.85
                                                                   ============
</TABLE>

   The accompanying notes are an integral part of these financial statements.
 
                                       7
<PAGE>
 
STATEMENT OF OPERATIONS--FOR THE YEAR ENDED DECEMBER 31, 1994
- --------------------------------------------------------------------------------
<TABLE>
<S>                                                     <C>        <C>
INVESTMENT INCOME (NOTE 1):
  Interest........................................................ $ 10,824,935
EXPENSES:
  Management fees (Note 4)............................  $  692,136
  Distribution fees (Note 6)
  Class A.............................................     344,155
  Class B.............................................       7,649
  Transfer fees (Note 5)
  Class A.............................................     219,238
  Class B.............................................       1,123
  Registration fees...................................      35,349
  Professional fees...................................      95,101
  Accounting..........................................      80,856
  Custodian fees......................................      29,365
  Printing............................................      21,537
  Fees and expenses of nonaffiliated trustees.........      18,430
  Miscellaneous.......................................      24,666
                                                        ----------
   Total expenses.....................................  $1,569,605
   Less management fees waived by Pioneering Manage-
    ment Corporation (Note 4).........................     155,511
                                                        ----------
   Net expenses................................................... $  1,414,094
                                                                   ------------
     Net investment income........................................ $  9,410,841
                                                                   ------------
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
  Net realized loss on investments................................ $ (5,382,396)
  Net decrease in unrealized gain on investments..................   (9,650,678)
                                                                   ------------
   Net loss on investments........................................ $(15,033,074)
                                                                   ------------
     Net decrease in net assets resulting from operations......... $ (5,622,233)
                                                                   ============
</TABLE>

   The accompanying notes are an integral part of these financial statements.
 
                                       8
<PAGE>
 
STATEMENTS OF CHANGES IN NET ASSETS FOR THE YEARS ENDED DECEMBER 31, 1994 AND
1993
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                        1994          1993
                                                    ------------  ------------
<S>                                                 <C>           <C>
FROM OPERATIONS:
  Net investment income............................ $  9,410,841  $  6,248,339
  Net realized gain (loss) on investments..........   (5,382,396)      316,675
  Net increase (decrease) in unrealized
   gain on investments.............................   (9,650,678)    1,589,595
                                                    ------------  ------------
  Net increase (decrease) in net assets resulting
   from operations................................. $ (5,622,233) $  8,154,609
                                                    ------------  ------------
DISTRIBUTIONS TO SHAREHOLDERS:
  From net investment income
   Class A ($0.66 and $0.67 per share,
    respectively).................................. $ (9,314,482) $ (6,208,496)
   Class B ($0.40 and $0.00 per share,
    respectively)..................................      (47,215)      --
  From realized gains on investments
   Class A ($0.035 and $0.00 per share,
    respectively)..................................      --           (355,887)
                                                    ------------  ------------
  Decrease in net assets resulting from
   distributions to shareholders................... $ (9,361,697) $ (6,564,383)
                                                    ------------  ------------
FROM TRUST SHARE TRANSACTIONS:
  Net proceeds from sale of shares................. $110,576,083  $ 50,752,451
  Net asset value of shares issued to shareholders
   in reinvestment of dividends....................    7,078,526     4,864,936
  Cost of shares repurchased.......................  (44,533,695)  (36,740,898)
                                                    ------------  ------------
   Net increase in net assets resulting from
    trust share transactions....................... $ 73,120,914  $ 18,876,489
                                                    ------------  ------------
     Net increase in net assets.................... $ 58,136,984  $ 20,466,715

NET ASSETS:
  Beginning of year................................  105,891,514    85,424,799
                                                    ------------  ------------
  End of year (including accumulated undistributed
   net investment income of $52,709 and $3,565,
   respectively)................................... $164,028,498  $105,891,514
                                                    ============  ============
</TABLE>
 
<TABLE>
<CAPTION>
                                     1994                      1993
                            ------------------------  ------------------------
                              SHARES       AMOUNT       SHARES       AMOUNT
                            ----------  ------------  ----------  ------------
<S>                         <C>         <C>           <C>         <C>
CLASS A
  Shares sold.............. 10,868,373  $107,749,001   4,799,690  $ 50,752,451
  Shares issued to
   shareholders in
   reinvestment of
   distributions...........    723,067     7,040,310     460,891     4,864,936
  Less shares repurchased.. (4,464,315)  (43,692,421) (3,473,721)  (36,740,898)
                            ----------  ------------  ----------  ------------
  Net increase.............  7,127,125  $ 71,096,890   1,786,860  $ 18,876,489
                            ==========  ============  ==========  ============
CLASS B *
  Shares sold..............    292,379    $2,827,082
  Shares issued to
   shareholders in
   reinvestment of
   distributions...........      4,004        38,216
  Less shares repurchased..    (86,801)     (841,274)
                            ----------  ------------
  Net increase.............    209,582    $2,024,024
                            ==========  ============
</TABLE>
 
* Class B shares were first publicly offered on April 29, 1994.
 
   The accompanying notes are an integral part of these financial statements.
 
                                       9
<PAGE>
 
FINANCIAL HIGHLIGHTS--SELECTED DATA FOR A SHARE OUTSTANDING FOR THE PERIODS
PRESENTED
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                        MAY 31
                                 FOR THE YEAR ENDED DECEMBER 31,                          TO
                         ---------------------------------------------------------   DECEMBER 31,
                          1994+     1993      1992      1991      1990      1989         1988
                         -------   -------   -------   -------   -------   -------   ------------
<S>                      <C>       <C>       <C>       <C>       <C>       <C>       <C>
CLASS A
Net asset value,
 beginning of period...  $ 10.48   $ 10.27   $ 10.35   $ 10.03   $ 10.04   $  9.86     $ 10.00
                         -------   -------   -------   -------   -------   -------     -------
INCOME FROM INVESTMENT
 OPERATIONS:
 Net investment income.  $  0.66   $  0.68   $  0.73   $  0.84   $  0.87   $  0.90     $  0.51
 Net realized and
  unrealized gain
  (loss) on
  investments..........    (1.07)     0.24     (0.07)     0.33     (0.02)     0.18       (0.14)
                         -------   -------   -------   -------   -------   -------     -------
  Total income (loss)
   from investment
   operations..........  $ (0.41)  $  0.92   $  0.66   $  1.17   $  0.85   $  1.08     $  0.37
DISTRIBUTIONS TO
 SHAREHOLDERS:
 From net investment
  income...............    (0.66)    (0.67)    (0.73)    (0.85)    (0.86)    (0.90)      (0.51)
 From net realized
  capital gains........     0.00     (0.04)    (0.01)      --        --        --          --
                         -------   -------   -------   -------   -------   -------     -------
Net increase (decrease)
 in net asset value....  $ (1.07)  $  0.21   $ (0.08)  $  0.32   $ (0.01)  $  0.18     $ (0.14)
                         -------   -------   -------   -------   -------   -------     -------
Net asset value, end of
 period................  $  9.41   $ 10.48   $ 10.27   $ 10.35   $ 10.03   $ 10.04     $  9.86
                         =======   =======   =======   =======   =======   =======     =======
Total return *.........    (3.97)%    9.07%     6.67%    12.14%     8.99%    11.49%       3.76%
Ratio of net operating
 expenses to average
 net assets............     1.00 %    1.00%     1.03%     0.75%     0.75%     0.75%       0.67%**
Ratio of net investment
 income to average net
 assets................     6.84 %    6.37%     7.01%     8.07%     8.75%     9.10%       8.86%**
Portfolio turnover
 rate..................    60.50 %   41.50%    54.50%    36.54%    69.12%    66.06%      61.20%**
Net assets, end of
 period (in thousands).   $161,858  $105,892   $85,425   $43,711   $17,160   $10,533      $4,634
RATIOS ASSUMING NO
 WAIVER OF FEES OR
 ASSUMPTION OF
 EXPENSES:
 Net operating
  expenses.............     1.12%     1.13%     1.25%     1.75%     1.81%     2.36%       3.01%**
 Net investment income.     6.72%     6.24%     6.79%     7.07%     7.69%     7.49%       6.52%**
</TABLE>
 
 + Based upon average shares outstanding and average net assets for the period
   presented.
 * Assumes initial investment at net asset value at the beginning of each peri-
   od, reinvestment of all distributions, the complete redemption of the in-
   vestment at net asset value at the end of each period and no sales charges.
   Total return would be reduced if sales charges were taken into account.
** Annualized.
 
   The accompanying notes are an integral part of these financial statements.
 
                                       10
<PAGE>
 
FINANCIAL HIGHLIGHTS--SELECTED DATA FOR A SHARE OUTSTANDING FOR THE PERIOD
PRESENTED (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                              APRIL 29, 1994
                                                           TO DECEMBER 31, 1994+
                                                           ---------------------
<S>                                                        <C>
CLASS B ***
Net asset value, beginning of period.....................         $  9.85
                                                                  -------
INCOME FROM INVESTMENT OPERATIONS:
 Net investment income...................................         $  0.40
 Net realized and unrealized loss on investments.........           (0.45)
                                                                  -------
  Total loss from investment operations..................         $ (0.05)
DISTRIBUTIONS TO SHAREHOLDERS:
 From net investment income..............................           (0.40)
                                                                  -------
Net decrease in net asset value..........................         $ (0.45)
                                                                  -------
Net asset value, end of period...........................         $  9.40
                                                                  =======
Total return *...........................................           (0.57)%
Ratio of net operating expenses to average net assets....            1.78 %**
Ratio of net investment income to average net assets.....            6.35 %**
Portfolio turnover rate..................................           60.50 %**
Net assets, end of period (in thousands).................         $ 2,170
RATIOS ASSUMING NO WAIVER OF FEES OR ASSUMPTION OF EX-
 PENSES:
 Net operating expenses..................................            1.90 %**
 Net investment income...................................            6.23 %**
</TABLE>
 
  + Based upon average shares outstanding and average net assets for the period
    presented.
  * Assumes initial investment at net asset value at the beginning of each pe-
    riod, reinvestment of all distributions, and the complete redemption of the
    investment at net asset value at the end of each period.
 ** Annualized.
*** Class B shares were first publicly offered on April 29, 1994.
 
   The accompanying notes are an integral part of these financial statements.
 
                                       11
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS--DECEMBER 31, 1994
- -------------------------------------------------------------------------------
 
1. Pioneer America Income Trust (the Trust) is a Massachusetts business trust,
registered under the Investment Company Act of 1940 as a diversified, open-end
management company.
 The Board of Trustees authorized the issuance of two classes of the Trust,
designated as Class A and Class B shares. Class B shares were first publicly
offered on April 29, 1994. Shares issued and outstanding prior to April 29,
1994 were designated as Class A shares. The shares of each class represent an
interest in the same portfolio of investments of the Trust and have equal vot-
ing, redemption, dividend and liquidation rights, except that each class of
shares can bear different transfer agent and distribution fees and have exclu-
sive voting rights with respect to the distribution plans that have been
adopted by holders of Class A and Class B shares, respectively.
 After the close of business on June 30, 1994 (Closing Date), the Trust ac-
quired all assets of Pioneer America Fund, Inc. (the Fund) in exchange solely
for (i) the issuance of Class A shares of beneficial interest of the Trust and
(ii) the assumption by the Trust of the liabilities of the Fund. Following
this transfer, the Fund was liquidated and dissolved and Class A shares of the
Trust were distributed to the former shareholders of the Fund. Prior to the
Closing Date, the Trust's name was Pioneer U.S. Government Trust.
 This reorganization was accomplished by a tax-free transfer of assets whereby
each shareholder of the Fund received a number of full and fractional shares
of the Trust having a total net asset value equal to the net asset value of
their shares of the Fund held as of the Closing Date. The net assets, net as-
set value per share and shares outstanding as of the Closing Date were:
 
<TABLE>
<CAPTION>
                                                                      PIONEER
                                                      PIONEER U.S.    AMERICA
                                            PIONEER    GOVERNMENT  INCOME TRUST,
                                            AMERICA      TRUST,       CLASS A
                                          FUND, INC.    CLASS A     (COMBINED)
                                          ----------- ------------ -------------
<S>                                       <C>         <C>          <C>
Net Assets............................... $77,633,738 $102,452,683 $180,086,421
Shares Outstanding.......................   7,474,764   10,545,849   18,537,384
Net Asset Value Per Share................      $10.39        $9.71        $9.71
</TABLE>
 
 The following is a summary of significant accounting policies consistently
followed by the Trust, which are in conformity with those generally accepted
in the investment company industry.
 A. Investment Securities--Security transactions are recorded on the date the
securities are purchased or sold. Investments in securities are valued based
on valuations furnished by an independent pricing service which utilizes a ma-
trix system. This matrix system reflects such factors as security prices,
yields, maturities and ratings, and is supplemented by dealer and exchange
quotations and fair value information from other sources. Principal amounts of
mortgage-backed securities are adjusted for monthly principal paydowns. Pre-
mium and discount related to mortgage-backed securities are amortized or ac-
creted in direct proportion to the underlying monthly paydowns. Temporary cash
investments are valued at cost plus accrued interest, which approximates mar-
ket value. Interest income is recorded on the accrual basis.
 Gains and losses from sales of investments are calculated on the "identified
cost" method for both financial reporting and federal income tax purposes. It
is the Trust's practice first to select for sale those securities that have
the highest cost and also qualify for long-term capital gain or loss treatment
for tax purposes.
 B. Federal Taxes--It is the Trust's policy to comply with the requirements of
the Internal Revenue Code applicable to regulated investment companies and to
distribute all of its net investment income and net realized capital gains, if
any, to its shareholders. Therefore, no federal tax provisions are required.
 The characterization of distributions to shareholders for financial reporting
purposes is determined in accordance with income tax rules. Therefore, the
source of a portfolio's distributions may be shown in the accompanying finan-
cial statements as either from or in excess of net investment income or net
realized gain on investment transactions, or from capital, depending on the
type of book/tax differences that may exist.
 C. Trust Shares--The Trust records sales and repurchases of its trust shares
on the trade date. Net losses, if any, as a result of cancellations, are ab-
sorbed by Pioneer Funds Distributor, Inc. (PFD), the principal underwriter for
the Trust and a wholly owned subsidiary of The Pioneer Group, Inc. (PGI). PFD
earned $57,182 in underwriting commissions on the sale of trust shares during
the year ended December 31, 1994. Shareholders begin earning dividends on the
first business day following receipt of payment for purchased shares. Shares
continue to earn dividends up to and including the date of redemption. Divi-
dends are declared daily and are paid on the last business day of each month.
Monthly distributions may also include a portion of any net short-term capital
gains realized by the Trust. Net
 
                                      12
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS--DECEMBER 31, 1994 (CONTINUED)
- --------------------------------------------------------------------------------
long-term capital gains, if any, will be distributed annually in December. Div-
idends paid by the Trust with respect to each class of shares are calculated in
the same manner, at the same time and on the same day and are in the same
amount, except that Class A and Class B shares can bear different transfer
agent and distribution fees.
 D. Class Allocations--Distribution expenses are calculated based on the aver-
age daily net asset value attributable to Class A and Class B shares of the
Trust, respectively. Shareholders of Class A and Class B share all expenses and
fees paid to the service organization, Pioneering Services Corporation (PSC),
for their services, which are allocated based on the number of accounts in each
class and the ratable allocation of related out of pocket expenses (See Note
5). Income, common expenses and realized and unrealized gains (losses) are cal-
culated at the Trust level and allocated daily to each class of share based on
the respective percentage of adjusted net assets at the beginning of the day.
2. At December 31, 1994, the total cost of securities, the net realized loss
and the net unrealized loss for federal income tax purposes were identical to
those on a financial reporting basis. Aggregate gross unrealized gain on secu-
rities in which there was an excess of market value over tax cost was approxi-
mately $194,682. Aggregate gross unrealized loss on securities in which there
was an excess of tax cost over market value was approximately $7,410,532. Net
unrealized loss for tax purposes was approximately $7,215,850.
 At December 31, 1994, the Trust had a net capital loss carryforward of
$5,413,884 which will expire between 2001 and 2002 if not utilized.
3. During the year ended December 31, 1994, the cost of purchases and proceeds
from sales of investments (including principal paydowns on mortgage-backed se-
curities), other than temporary cash investments, were $80,382,586 and
$81,623,801, respectively.
4. Pioneering Management Corporation (PMC) is the Trust's investment adviser
and a wholly owned subsidiary of PGI. Management fees are calculated at the an-
nual rate of 0.50% of the Trust's average daily net assets.
 PMC has agreed to waive its management fees and to assume other operating ex-
penses of the Trust to the extent necessary to limit Class A expenses to 1.0%
of the average daily net assets attributable to the Class A shares; the portion
of the Trust-wide expenses attributable to Class B shares will be reduced only
to the extent such expenses are reduced for the Class A shares. This agreement
is voluntary and temporary and may be revised or terminated by PMC at any time.
 PMC furnishes investment advice, provides office facilities, and pays execu-
tive salaries and certain other operating expenses under the management agree-
ment. No officer of the Trust receives any compensation directly from the
Trust. All officers of the Trust are directors and/or officers of PMC and/or
PFD. In addition, certain other services and costs, including accounting, regu-
latory reporting and insurance premiums, are paid by the Trust under the man-
agement agreement. Included in Accrued expenses is $12,232 in accounting fees
payable to PMC at December 31, 1994.
5. Pioneering Services Corporation (PSC), a wholly owned subsidiary of PGI,
provides substantially all transfer agent and shareholder services to the Trust
at negotiated rates. Included in Accrued expenses is $29,588 in transfer fees
payable to PSC at December 31, 1994.
6. The Trust has adopted a Plan of Distribution for both Class A shares ("Class
A Plan") and Class B shares ("Class B Plan") in accordance with Rule 12b-1 un-
der the Investment Company Act of 1940, pursuant to which certain distribution
and service fees are paid to PFD.
 Pursuant to the Class A Plan, the Trust may reimburse PFD for its actual ex-
penditures to finance any activity primarily intended to result in the sale of
Class A shares or to provide services to holders of Class A shares. Reimburse-
ment for such expenditures, if any, may not exceed 0.25% of the Trust's average
annual net assets attributable to Class A shares. The Class B Plan provides
that the Trust may pay a distribution fee at an annual rate of 0.75% of the
Trust's average daily net assets attributable to Class B shares and may pay PFD
a service fee at the annual rate of 0.25% of the Trust's average daily net as-
sets attributable to Class B shares. Included in Accrued expenses is $107,082
in distribution fees payable to PFD at December 31, 1994.
 Class B shares which are redeemed within six years of purchase are subject to
a contingent deferred sales charge ("CDSC") at declining rates beginning at
4.0% of the lesser of the current market value at the time of redemption or the
original purchase cost of the shares being redeemed. Proceeds from the CDSC are
paid to PFD. For the period ending December 31, 1994, CDSC in the amount of
$253 was paid to PFD.
 
                                       13
<PAGE>
 
TAX TREATMENT OF DISTRIBUTIONS MADE DURING THE YEAR ENDED DECEMBER 31, 1994
- --------------------------------------------------------------------------------
 
 During the year ended December 31, 1994, the Pioneer America Income Trust paid
the following distributions:
 
<TABLE>
<CAPTION>
                                                     DISTRIBUTIONS DISTRIBUTIONS
                                                       PER SHARE     PER SHARE
                                                       FROM NET      FROM NET
                                                      INVESTMENT     INVESTMENT
                                                         INCOME        INCOME
      PAYMENT DATE                                      CLASS A      CLASS B*
      ------------                                   ------------- -------------
     <S>                                             <C>           <C>
     1/31/94........................................    $0.055           --
     2/28/94........................................     0.055           --
     3/31/94........................................     0.055           --
     4/29/94........................................     0.055           --
     5/31/94........................................     0.053        $0.047
     6/30/94........................................     0.053         0.046
     7/29/94........................................     0.053         0.047
     8/31/94........................................     0.053         0.048
     9/30/94........................................     0.055         0.052
     10/31/94.......................................     0.055         0.052
     11/30/94.......................................     0.057         0.051
     12/30/94.......................................     0.061         0.053
                                                        ------        ------
     Total..........................................    $0.660        $0.396
                                                        ======        ======
</TABLE>
 
For purposes of the dividend exclusion, none of the distributions per share
qualify for the exclusion.
 
 * Class B shares were first publicly offered on April 29, 1994.
 
TRUSTEES' FEES, PRINCIPAL SHAREHOLDERS AND SHARE OWNERSHIP OF TRUSTEES AND
OFFICERS
- --------------------------------------------------------------------------------
The aggregate direct remuneration paid by the Trust to nonaffiliated trustees
and officers during the year ended December 31, 1994 was approximately $15,079,
plus expenses incurred in attending trustees meetings of approximately $1,804.
Fees of trustees who are affiliated with or "interested persons" of Pioneering
Management Corporation and Pioneer Funds Distributor, Inc., the investment
adviser and principal underwriter, respectively, of the Trust ($1,000 in 1994),
are reimbursed to the Trust by Pioneering Management Corporation in accordance
with the management contract with the Trust. At December 31, 1994, the trustees
and officers of the Trust owned beneficially 7,540 shares of the Trust
(approximately 0.04% of the outstanding shares). The Pioneer Group, Inc. is a
publicly held corporation of which Mr. Cogan owned approximately 15% of the
outstanding shares of capital stock at December 31, 1994.
 
                                       14
<PAGE>
 
REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
- -------------------------------------------------------------------------------
To the Shareholders and the Board of Trustees of Pioneer America Income Trust:
 
We have audited the accompanying balance sheet of Pioneer America Income Trust
(a Massachusetts business trust), including the schedule of investments, as of
December 31, 1994, and the related statement of operations for the year then
ended, statements of changes in net assets for the years ended December 31,
1994 and 1993, and financial highlights for the periods presented. These fi-
nancial statements and financial highlights are the responsibility of the
Trust's management. Our responsibility is to express an opinion on these fi-
nancial statements and financial highlights based on our audits.
 
We conducted our audits in accordance with generally accepted auditing stan-
dards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on
a test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities owned as of De-
cember 31, 1994, by correspondence with the custodian. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presenta-
tion. We believe that our audits provide a reasonable basis for our opinion.
 
In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of Pio-
neer America Income Trust as of December 31, 1994, the results of its opera-
tions, the changes in its net assets and financial highlights for the periods
presented, in conformity with generally accepted accounting principles.
 
                                                            ARTHUR ANDERSEN LLP
 
Boston, Massachusetts
February 3, 1995
 
                                      15
<PAGE>
 
 
 
 
 
 
 
 
 
PIONEER
AMERICA INCOME TRUST
60 State Street Boston, MA 02109
 
OFFICERS
John F. Cogan, Jr., Chairman and President
David D. Tripple, Executive Vice President
Sherman B. Russ, Vice President
William H. Keough, Treasurer
Joseph P. Barri, Secretary
 
TRUSTEES
John F. Cogan, Jr.           Marguerite A. Piret
Richard H. Egdahl, M.D.      David D. Tripple
Margaret B.W. Graham         Stephen K. West
John W. Kendrick             John Winthrop
 
INVESTMENT ADVISER           PRINCIPAL UNDERWRITER
Pioneering Management        Pioneer Funds 
Corporation                  Distributor, Inc.
 
CUSTODIAN                    LEGAL COUNSEL
Brown Brothers               Hale and Dorr
Harriman & Co.
 
SHAREHOLDER SERVICES         INDEPENDENT PUBLIC
AND TRANSFER AGENT           ACCOUNTANTS
Pioneering Services          Arthur Andersen LLP
Corporation
60 State Street
Boston, Massachusetts 02109
 
 
 Please call Pioneer for information on:
 Existing accounts, new accounts,
 prospectuses, applications and
 service forms.....................1-800-225-6292
 Fund yields and prices............1-800-225-4321
 Toll-free fax ....................1-800-225-4240
 Retirement plans..................1-800-622-0176
 Telecommunications Device for
 the Deaf (TDD)....................1-800-225-1997
 
When distributed to persons who are not shareholders of the Trust, this report
must be accompanied by an official prospectus, which discusses the objectives,
policies, sales charges and other information about the Trust.
 
0295-2264
(C)Pioneer Funds Distributor, Inc.


 
                                         [PIONEER LOGO APPEARS HERE]
 
     Pioneer America Income Trust*
 
     Annual Report December 31, 1994
 
 
 
     * Effective July 1, 1994, the Trust's name was changed from Pioneer
       U.S. Government Trust.




                                                                   EXHIBIT 15

                               DISTRIBUTION PLAN

                         PIONEER U.S. GOVERNMENT TRUST


     DISTRIBUTION PLAN, dated as of October 15, 1990 of PIONEER U.S.  GOVERNMENT
TRUST, a Massachusetts business trust (the "Trust").


                                   WITNESSETH

     WHEREAS,  the Trust is engaged in  business  as an  open-end,  diversified,
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 currently  distributes its shares of beneficial interest
(the "Shares") in accordance  with Rule 12b-1  promulgated by the Securities and
Exchange Commission under the 1940 Act ("Rule 12b-1"),  and desires to amend its
existing Distribution Plan (such amended Plan to be referred to as the "Plan");

     WHEREAS,  the Trust desires to engage  Pioneer Funds  Distributor,  Inc., a
Massachusetts  corporation ("PFD"), to provide certain distribution services for
the Trust in connection with the Plan;

     WHEREAS,  the Trust  desires to amend its existing  underwriting  agreement
with PFD, where PFD will provide facilities and personnel and render services to
the Trust in connection  with the offering and  distribution of the Shares (such
amended   underwriting   agreement  to  be  referred  to  as  the  "Underwriting
Agreement");

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

     WHEREAS,  the Board of Trustees of the Trust,  in  considering  whether the
Trust should adopt and implement this Plan, has evaluated such information as it
deemed  necessary  to an  informed  determination  whether  this 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  Plan  will  benefit  the  Trust  and its
shareholders.

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

     1. The Trust may expend  pursuant to this Plan amounts not to exceed .25 of
1% of the average daily net assets of the Trust per annum.

     2. Subject to the limit in paragraph 1, the Trust shall  reimburse  PFD for
amounts  expended by PFD to finance any activity which is primarily  intended to
result  in the sale of  shares  of the Trust or the  provision  of  services  to
shareholders  of the Trust,  including but not limited to  commissions  or other
payments to Dealers and salaries  and other  expenses of PFD relating to selling
or  servicing  efforts,  provided  that the Board of Trustees of the Trust shall
approve categories of expenses for which reimbursement shall be made pursuant to
this paragraph 2 and,  without  limiting the  generality of the  foregoing,  the
initial  categories  of such  expenses  shall be (i) a service fee to be paid to
qualified  broker-dealers  in an amount not to exceed .25 of 1% per annum of the
Trust's  daily net  assets;  (ii)  reimbursement  to PFD or  Pioneer  Management
Corporation  for its  expenditures  for  broker-dealer  commissions and employee
compensation  on certain  sales of the  Trust's  shares  with no  initial  sales
charge; and (iii)  reimbursement to PFD for expenses incurred providing services
to shareholders and supporting  broker-dealers and other organizations,  such as
banks  and trust  companies,  in their  effort to  provide  such  services  (any
addition of such  categories  shall be subject to the approval of the  Qualified
Trustees,  as defined below, of the Trust). Such reimbursement shall be paid ten
(10) days  after the end of the month or  quarter,  as the case may be, in which
such expenses are  incurred.  Reimbursable  expenses  will not carryover  beyond
twelve months for the time they are incurred.  The Trust  acknowledges  that PFD
will  charge a sales load in  connection  with sales of such shares and that PFD
will reallow to Dealers all or a portion of such sales load, as described in the


                                       2
<PAGE>

Trust's  Prospectus from time to time.  Nothing  contained herein is intended to
have any affect  whatsoever on PFD's ability to charge any such sales load or to
reallow all or any portion thereof to Dealers.

     3. The Trust  understands  that  agreements  between  PFD and  Dealers  may
provide for payment of fees to Dealers in connection with the sale of Shares and
the  provision of services to  shareholders  of the Trust.  Nothing in this Plan
shall be construed  as requiring  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 Shares.  PFD shall  agree and  undertake  that any  agreement  entered  into
between PFD and any Dealer  shall  provide that such Dealer shall look solely to
PFD for compensation for its services thereunder and that in no event shall such
Dealer seek an payment from the Trust.

     4. Nothing  herein  contained  shall be deemed to require the Trust to take
any action  contrary to its  Declaration  of Trust 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.

     5. This Plan shall  become  effective  upon  approval  by (i) a vote of the
Board  of  Trustees  and a vote  of 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 Plan or in any  agreement  related to the Plan
(the "Qualified Trustees"),  such votes to be cast in person at a meeting called
for the purpose of voting on this Plan and (ii) a vote of the  "majority  of the
outstanding vote securities" of the Trust.

     6. This  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.
This Plan shall expire on March 31 of any year,  beginning on March 31, 1991, in
which  such  approval  is  not  obtained.   In  the  event  of   termination  or
non-continuance  of the Plan,  the  Trust has  twelve  months to  reimburse  any
unreimbursed   expense  which  is  incurred   prior  to  such   termination   or
non-continuance.

     7. This Plan may be amended at any time by the Board of Trustees,  provided
that this Plan may not be amended to increase  materially  the limitation on the


                                       3
<PAGE>

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
the Trust and may not be  materially  amended in any case  without a vote of the
majority of both the Trustees and the Qualified Trustees.  Any amendment of this
Plan to increase or modify the expense  categories  initially  designated by the
Trustees in paragraph 2 above shall only  require  approval of a majority of the
Trustees  and the  Qualified  Trustees  if such  amendment  does not  include an
increase in the expense limitation set forth in paragraph 1 above. This 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
the Trust.

     8. The Trust and PFD shall provide 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 plan and the purposes for which such  expenditures
were made.

     9. While this 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.

     10.  For the  purposes  of  this  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.

     11.  The Trust  shall  preserve  copies of this  Plan,  and each  agreement
related hereto and each report referred to in paragraph 8 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.

     12.  This  Plan  shall  be  construed  in  accordance  with the laws of the
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

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

     14.  This Plan is  intended  to amend and  supersede  in its  entirety  the
existing Distribution Plan dated June 7, 1988, as renewed June 7, 1989.

                                       4



                                    FORM OF

                           CLASS B DISTRIBUTION PLAN

                         PIONEER U.S. GOVERNMENT TRUST


     CLASS B DISTRIBUTION PLAN, dated as of _____________,  1994 of PIONEER U.S.
GOVERNMENT TRUST, a Massachusetts business trust (the "Trust").

                                   WITNESSETH

     WHEREAS,  the Trust is engaged in  business  as an  open-end,  diversified,
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 B 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 B  distribution  plan (the "Class B Plan") as a plan
of distribution pursuant to such Rule;

     WHEREAS,  the  Trust  desires  that  Pioneer  Funds  Distributor,  Inc.,  a
Massachusetts corporation ("PFD"), provide certain distribution services for the
Trust's Class B Shares in connection with the Class B Plan;

     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 such Rule
12b-1) with PFD,  whereby PFD  provides  facilities  and  personnel  and renders
services to the Trust in connection with the offering and  distribution of Class
B Shares (the "Underwriting Agreement");

     WHEREAS,  the Trust also  recognizes and agrees that (a) PFD may retain the
services of firms or individuals to act as dealers or wholesalers (collectively,
the "Dealers") of the Class B Shares in connection  with the offering of Class B
Shares,  (b) PFD may  compensate  any Dealer  that  sells  Class B Shares in the
manner and at the rate or rates to be set forth in an agreement  between PFD and
<PAGE>

such Dealer and (c) PFD may make such  payments to the Dealers for  distribution
services  out of the fee  paid to PFD  hereunder,  any  deferred  sales  charges
imposed by PFD in connection with the repurchase of Class B shares,  its profits
or any other source available to it;

     WHEREAS,  the Trust  recognizes  and  agrees  that PFD may  impose  certain
deferred  sales charges in connection  with the  repurchase of Class B shares by
the Trust,  and PFD 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 B  Plan,  has  evaluated  such
information  as it deemed  necessary to an informed  determination  whether this
Class B 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 B Plan  will
benefit the Trust and its Class B shareholders;

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

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

          (b)  The  amount  of  compensation   paid  during  any  one  year  for
          distribution services shall be .75% of the average daily net assets of
          the Trust attributable to such year.

          (c)   Distribution   services  and  expenses  for  which  PFD  may  be
          compensated  pursuant  to  this  Plan  include,   without  limitation:
          compensation to and expenses of brokers and dealers who are members of
          the National Association of Securities Dealers, Inc. ("NASD") or their
          officers,  sales  representatives  and employees;  compensation to and


                                       2
<PAGE>

          expenses of PFD and any of its  officers,  sales  representatives  and
          employees,   including  allocable   overhead,   travel  and  telephone
          expenses, who engage in or support distribution of the Trust's Class B
          shares;  printing of reports and  prospectuses for other than existing
          shareholders;  and  preparation,  printing and  distribution  of sales
          literature and advertising materials.

          (d)  The  amount  of  compensation   paid  for  personal  and  account
          maintenance  services and expenses  shall be .25% of the average daily
          net  assets  of the  Trust  attributable  to such  year.  PFD shall be
          entitled  to be paid any  fees  payable  under  this  clause  (d) with
          respect  to Class B shares  for which no  dealer  of record  exists or
          qualification standards have not been met as partial consideration for
          personal services and/or account maintenance  services provided by PFD
          to the Class B shares.

          (e) Personal and account maintenance services for which PFD or Dealers
          may be compensated pursuant to this Plan include,  without limitation:
          payments made to or on account of PFD or 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 B shares  or their
          accounts or who provide similar services not otherwise  provided by or
          on behalf of the Trust.

          (f) PFD may impose certain  deferred sales charges in connection  with
          the  repurchase  of Class B shares by the Trust and PFD may retain (or
          receive  from the  Trust as the case may be) all such  deferred  sales
          charges.

          (g)  Appropriate  adjustments to payments made pursuant to clauses (b)
          and (d) of this paragraph 1 shall be made whenever necessary to ensure
          that no  payment  is made by the  Trust in  excess  of the  applicable
          maximum cap  imposed on asset  based,  front-end  and  deferred  sales
          charges by subsection (d) of Section 26 of Article III of the Rules of
          Fair Practice of the NASD.

     2. The Trust  understands  that  agreements  between  PFD and  Dealers  may
provide  for payment of fees to Dealers in  connection  with the sale of Class B


                                       3
<PAGE>

Shares and the provision of services to  shareholders  of the Trust.  Nothing in
this Class B Plan shall be construed as requiring  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 B Shares.  PFD shall agree and undertake  that
any  agreement  entered into between PFD and any Dealer shall  provide that such
Dealer shall look solely to PFD for compensation for its services thereunder and
that in no event shall such Dealer seek any payment from the Trust.

     3. Nothing  herein  contained  shall be deemed to require the Trust to take
any  action  contrary  to its  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.

     4. This Class B Plan shall become  effective upon approval by a vote of the
Board  of  Trustees  and a vote  of 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 B Plan or in any  agreements  related to
the Class B Plan (the "Qualified Trustees"),  such votes to be cast in person at
a meeting called for the purpose of voting on this Class B Plan.

     5. This Class B 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  obtained,  this Class B Plan shall  expire on
____________, 1995.

     6. This Class B Plan may be  amended at any time by the Board of  Trustees,
provided  that this Class B 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
Class B voting securities" of the Trust 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  B 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 B of the Trust.

     7. The Trust and PFD shall  provide to the Trust's  Board of Trustees,  and


                                       4
<PAGE>

the Board of Trustees shall review, at least quarterly,  a written report of the
amounts  expended  under  this  Class B Plan and the  purposes  for  which  such
expenditures were made.

     8. While this Class B 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 B 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 B 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 B 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 B Plan shall be held or made invalid by
a court decision,  statute, rule or otherwise, the remainder of the Class B Plan
shall not be affected thereby.




                                       5


Pioneer U.S. Government Trust
File No. 33-20795

Exhibit B

                         Pioneer U.S. Government Trust


Description of General Average Annual Total Return

                             1/n
     T        =       (ERV/P)    -1, where:

     T        =       Average annual total return

     n        =       Number of years

     ERV      =       Ending redeemable value of a hypothetical $1,000 
                      payment made at the beginning of n years

     P        =       Hypothetical $1,000 initial payment



Formula modified to reflect total return since inception (part-year)


     T        =       (ERV/P)-1, where:

     T        =       Actual total return for period 6/1/88-12/31/88

     ERV      =       Ending redeemable value of a hypothetical $1,000 
                      payment on June 1, 1988 (inception)

     P        =       Hypothetical $1,000 initial payment



                   Pioneer U.S. Government Trust Total Return
                      Period 6/1/88 (Inception) - 12/31/88

Inception

     T        =       ($990.45/$1,000.00)-1

     T        =       -0.955% (slightly less than -1%)



<PAGE>


                         Pioneer U. S. Government Trust


CURRENT YIELD CALCULATION FOR THE 30-DAY PERIOD ENDING 12/31/88
- ---------------------------------------------------------------
Standard yield Formula:        2(((((a-b)/(cd))+1)^6)-1)


Yield Calculation     =        2[(a-b +1)^6-1]
                                  cd

  a-b   =   net income during period                          $33,848.01

    c   =   average daily number of shares during period      458,929.104

    d   =   offering price per share on last day of period        $10.32


        Standardized Yield as of 12/31/88                           8.73%


Yield=    2 x [(      33,848.01      +1)6 -1]
                --------------------         
                458,929.104 x 10.32

      =   2 x [(1.007147)6 -1]

      =   2 x (1.043654 -1)

      =   0.08731

      =   8.73%



<TABLE> <S> <C>

<ARTICLE>                               6
<CIK>                                   0000831120
<NAME>                                  Pioneer America Income Trust
<SERIES>
<NUMBER>                                0
<NAME>                                  none
<MULTIPLIER>                            1
<CURRENCY>                              U. S .Dollars
<PERIOD-TYPE>                           Year
<FISCAL-YEAR-END>                       DEC-31-1994
<PERIOD-START>                          JAN-01-1994
<PERIOD-END>                            DEC-31-1994
<EXCHANGE-RATE>                         1
<INVESTMENTS-AT-COST>                   169,326,429
<INVESTMENTS-AT-VALUE>                  162,110,579
<RECEIVABLES>                           0
<ASSETS-OTHER>                          11,221
<OTHER-ITEMS-ASSETS>                    2,840,632
<TOTAL-ASSETS>                          164,962,432
<PAYABLE-FOR-SECURITIES>                0
<SENIOR-LONG-TERM-DEBT>                 0
<OTHER-ITEMS-LIABILITIES>               933,934
<TOTAL-LIABILITIES>                     933,934
<SENIOR-EQUITY>                         0
<PAID-IN-CAPITAL-COMMON>                176,605,523
<SHARES-COMMON-STOCK>                   17,437,503
<SHARES-COMMON-PRIOR>                   10,310,378
<ACCUMULATED-NII-CURRENT>               52,709
<OVERDISTRIBUTION-NII>                  0
<ACCUMULATED-NET-GAINS>                 (5,413,884)
<OVERDISTRIBUTION-GAINS>                0
<ACCUM-APPREC-OR-DEPREC>                (7,215,850)
<NET-ASSETS>                            164,028,498
<DIVIDEND-INCOME>                       0
<INTEREST-INCOME>                       10,824,935
<OTHER-INCOME>                          0
<EXPENSES-NET>                          (1,414,094)
<NET-INVESTMENT-INCOME>                 9,410,841
<REALIZED-GAINS-CURRENT>                (5,382,396)
<APPREC-INCREASE-CURRENT>               (9,650,678)
<NET-CHANGE-FROM-OPS>                   (5,622,233)
<EQUALIZATION>                          0
<DISTRIBUTIONS-OF-INCOME>               (9,361,697)
<DISTRIBUTIONS-OF-GAINS>                0
<DISTRIBUTIONS-OTHER>                   0
<NUMBER-OF-SHARES-SOLD>                 11,160,752
<NUMBER-OF-SHARES-REDEEMED>             (4,551,116)
<SHARES-REINVESTED>                     727,071
<NET-CHANGE-IN-ASSETS>                  58,136,984
<ACCUMULATED-NII-PRIOR>                 3,565
<ACCUMULATED-GAINS-PRIOR>               2,403,340
<OVERDISTRIB-NII-PRIOR>                 0
<OVERDIST-NET-GAINS-PRIOR>              0
<GROSS-ADVISORY-FEES>                   (692,136)
<INTEREST-EXPENSE>                      0
<GROSS-EXPENSE>                         (1,569,605)
<AVERAGE-NET-ASSETS>                    156,650,717
<PER-SHARE-NAV-BEGIN>                   10.480
<PER-SHARE-NII>                         0.660
<PER-SHARE-GAIN-APPREC>                 (1.070)
<PER-SHARE-DIVIDEND>                    (0.660)
<PER-SHARE-DISTRIBUTIONS>               0.000
<RETURNS-OF-CAPITAL>                    0.000
<PER-SHARE-NAV-END>                     9.410
<EXPENSE-RATIO>                         1.000
<AVG-DEBT-OUTSTANDING>                  0
<AVG-DEBT-PER-SHARE>                    0.000

</TABLE>


                               POWER OF ATTORNEY


     I, the  undersigned  Trustee and officer of Pioneer  Money Market Trust and
Pioneer U.S. Government Trust (collectively,  the "Funds"), each a Massachusetts
business trust, do hereby  constitute and appoint John F. Cogan,  Jr., Joseph P.
Barri and  William H.  Keough,  and each of them acting  singly,  to be my true,
sufficient  and lawful  attorneys,  with full power to each of them, and each of
them acting  singly,  to sign for me, in my name and in the  capacity  indicated
below, the Registration  Statements on Forms N-14 to be filed by the Funds under
the Investment Company Act of 1940, as amended,  and under the Securities Act of
1933,  as  amended,  and any and all  amendments  thereto  with  respect  to the
offering of the Funds' shares of beneficial interest,  no par value, and any and
all other  documents and papers relating  thereto,  and generally to do all such
things in my name and on my behalf in the capacity indicated to enable the Funds
to  comply  with  the  Investment  Company  Act of  1940,  as  amended,  and the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange Commission thereunder,  hereby ratifying and confirming my signature as
it may be signed by said  attorneys or each of them to any and all amendments to
said Registration Statements.

     IN WITNESS  WHEREOF,  I have hereunder set my hand on the date set opposite
my signature.



Dated:        3/7/94                  /s/ John F. Cogan, Jr.
                                      John F. Cogan, Jr.

<PAGE>

                               POWER OF ATTORNEY


     I, the  undersigned  Trustee and officer of Pioneer  Money Market Trust and
Pioneer U.S. Government Trust (collectively,  the "Funds"), each a Massachusetts
business trust, do hereby  constitute and appoint John F. Cogan,  Jr., Joseph P.
Barri and  William H.  Keough,  and each of them acting  singly,  to be my true,
sufficient  and lawful  attorneys,  with full power to each of them, and each of
them acting  singly,  to sign for me, in my name and in the  capacity  indicated
below, the Registration  Statements on Forms N-14 to be filed by the Funds under
the Investment Company Act of 1940, as amended,  and under the Securities Act of
1933,  as  amended,  and any and all  amendments  thereto  with  respect  to the
offering of the Funds' shares of beneficial interest,  no par value, and any and
all other  documents and papers relating  thereto,  and generally to do all such
things in my name and on my behalf in the capacity indicated to enable the Funds
to  comply  with  the  Investment  Company  Act of  1940,  as  amended,  and the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange Commission thereunder,  hereby ratifying and confirming my signature as
it may be signed by said  attorneys or each of them to any and all amendments to
said Registration Statements.

     IN WITNESS  WHEREOF,  I have hereunder set my hand on the date set opposite
my signature.



Dated:        3/7/94                  /s/David Tripple
                                      David Tripple



<PAGE>


                               POWER OF ATTORNEY


     I, the  undersigned  Trustee of Pioneer Money Market Trust and Pioneer U.S.
Government  Trust  (collectively,  the "Funds"),  each a Massachusetts  business
trust, do hereby  constitute and appoint John F. Cogan, Jr., Joseph P. Barri and
William H. Keough, and each of them acting singly, to be my true, sufficient and
lawful  attorneys,  with  full  power to each of them,  and each of them  acting
singly,  to sign for me, in my name and in the  capacity  indicated  below,  the
Registration  Statements  on  Forms  N-14 to be  filed by the  Funds  under  the
Investment  Company Act of 1940,  as amended,  and under the  Securities  Act of
1933,  as  amended,  and any and all  amendments  thereto  with  respect  to the
offering of the Funds' shares of beneficial interest,  no par value, and any and
all other  documents and papers relating  thereto,  and generally to do all such
things in my name and on my behalf in the capacity indicated to enable the Funds
to  comply  with  the  Investment  Company  Act of  1940,  as  amended,  and the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange Commission thereunder,  hereby ratifying and confirming my signature as
it may be signed by said  attorneys or each of them to any and all amendments to
said Registration Statements.

     IN WITNESS  WHEREOF,  I have hereunder set my hand on the date set opposite
my signature.



Dated:        3/7/94                   /s/ Margaret B. W. Graham
                                       Margaret B. W. Graham


<PAGE>


                               POWER OF ATTORNEY


     I, the  undersigned  Trustee of Pioneer Money Market Trust and Pioneer U.S.
Government  Trust  (collectively,  the "Funds"),  each a Massachusetts  business
trust, do hereby  constitute and appoint John F. Cogan, Jr., Joseph P. Barri and
William H. Keough, and each of them acting singly, to be my true, sufficient and
lawful  attorneys,  with  full  power to each of them,  and each of them  acting
singly,  to sign for me, in my name and in the  capacity  indicated  below,  the
Registration  Statements  on  Forms  N-14 to be  filed by the  Funds  under  the
Investment  Company Act of 1940,  as amended,  and under the  Securities  Act of
1933,  as  amended,  and any and all  amendments  thereto  with  respect  to the
offering of the Funds' shares of beneficial interest,  no par value, and any and
all other  documents and papers relating  thereto,  and generally to do all such
things in my name and on my behalf in the capacity indicated to enable the Funds
to  comply  with  the  Investment  Company  Act of  1940,  as  amended,  and the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange Commission thereunder,  hereby ratifying and confirming my signature as
it may be signed by said  attorneys or each of them to any and all amendments to
said Registration Statements.

     IN WITNESS  WHEREOF,  I have hereunder set my hand on the date set opposite
my signature.



Dated:        3/7/94                    /s/ Richard H. Egdahl, M.D.
                                        Richard H. Egdahl, M.D.


<PAGE>


                               POWER OF ATTORNEY


     I, the  undersigned  Trustee of Pioneer Money Market Trust and Pioneer U.S.
Government  Trust  (collectively,  the "Funds"),  each a Massachusetts  business
trust, do hereby  constitute and appoint John F. Cogan, Jr., Joseph P. Barri and
William H. Keough, and each of them acting singly, to be my true, sufficient and
lawful  attorneys,  with  full  power to each of them,  and each of them  acting
singly,  to sign for me, in my name and in the  capacity  indicated  below,  the
Registration  Statements  on  Forms  N-14 to be  filed by the  Funds  under  the
Investment  Company Act of 1940,  as amended,  and under the  Securities  Act of
1933,  as  amended,  and any and all  amendments  thereto  with  respect  to the
offering of the Funds' shares of beneficial interest,  no par value, and any and
all other  documents and papers relating  thereto,  and generally to do all such
things in my name and on my behalf in the capacity indicated to enable the Funds
to  comply  with  the  Investment  Company  Act of  1940,  as  amended,  and the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange Commission thereunder,  hereby ratifying and confirming my signature as
it may be signed by said  attorneys or each of them to any and all amendments to
said Registration Statements.

     IN WITNESS  WHEREOF,  I have hereunder set my hand on the date set opposite
my signature.



Dated:        3/7/94                    /s/ Marguerite A. Piret
                                        Marguerite A. Piret


<PAGE>

                               POWER OF ATTORNEY


     I, the  undersigned  Trustee of Pioneer Money Market Trust and Pioneer U.S.
Government  Trust  (collectively,  the "Funds"),  each a Massachusetts  business
trust, do hereby  constitute and appoint John F. Cogan, Jr., Joseph P. Barri and
William H. Keough, and each of them acting singly, to be my true, sufficient and
lawful  attorneys,  with  full  power to each of them,  and each of them  acting
singly,  to sign for me, in my name and in the  capacity  indicated  below,  the
Registration  Statements  on  Forms  N-14 to be  filed by the  Funds  under  the
Investment  Company Act of 1940,  as amended,  and under the  Securities  Act of
1933,  as  amended,  and any and all  amendments  thereto  with  respect  to the
offering of the Funds' shares of beneficial interest,  no par value, and any and
all other  documents and papers relating  thereto,  and generally to do all such
things in my name and on my behalf in the capacity indicated to enable the Funds
to  comply  with  the  Investment  Company  Act of  1940,  as  amended,  and the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange Commission thereunder,  hereby ratifying and confirming my signature as
it may be signed by said  attorneys or each of them to any and all amendments to
said Registration Statements.

     IN WITNESS  WHEREOF,  I have hereunder set my hand on the date set opposite
my signature.



Dated:        3/7/94                    /s/ John Winthrop
                                        John Winthrop


<PAGE>


                               POWER OF ATTORNEY


     I, the  undersigned  Trustee of Pioneer Money Market Trust and Pioneer U.S.
Government  Trust  (collectively,  the "Funds"),  each a Massachusetts  business
trust, do hereby  constitute and appoint John F. Cogan, Jr., Joseph P. Barri and
William H. Keough, and each of them acting singly, to be my true, sufficient and
lawful  attorneys,  with  full  power to each of them,  and each of them  acting
singly,  to sign for me, in my name and in the  capacity  indicated  below,  the
Registration  Statements  on  Forms  N-14 to be  filed by the  Funds  under  the
Investment  Company Act of 1940,  as amended,  and under the  Securities  Act of
1933,  as  amended,  and any and all  amendments  thereto  with  respect  to the
offering of the Funds' shares of beneficial interest,  no par value, and any and
all other  documents and papers relating  thereto,  and generally to do all such
things in my name and on my behalf in the capacity indicated to enable the Funds
to  comply  with  the  Investment  Company  Act of  1940,  as  amended,  and the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange Commission thereunder,  hereby ratifying and confirming my signature as
it may be signed by said  attorneys or each of them to any and all amendments to
said Registration Statements.

     IN WITNESS  WHEREOF,  I have hereunder set my hand on the date set opposite
my signature.



Dated:        3/7/94                    /s/ John W. Kendrick
                                        John W. Kendrick


<PAGE>


                               POWER OF ATTORNEY


     I, the  undersigned  Trustee of Pioneer Money Market Trust and Pioneer U.S.
Government  Trust  (collectively,  the "Funds"),  each a Massachusetts  business
trust, do hereby  constitute and appoint John F. Cogan, Jr., Joseph P. Barri and
William H. Keough, and each of them acting singly, to be my true, sufficient and
lawful  attorneys,  with  full  power to each of them,  and each of them  acting
singly,  to sign for me, in my name and in the  capacity  indicated  below,  the
Registration  Statements  on  Forms  N-14 to be  filed by the  Funds  under  the
Investment  Company Act of 1940,  as amended,  and under the  Securities  Act of
1933,  as  amended,  and any and all  amendments  thereto  with  respect  to the
offering of the Funds' shares of beneficial interest,  no par value, and any and
all other  documents and papers relating  thereto,  and generally to do all such
things in my name and on my behalf in the capacity indicated to enable the Funds
to  comply  with  the  Investment  Company  Act of  1940,  as  amended,  and the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange Commission thereunder,  hereby ratifying and confirming my signature as
it may be signed by said  attorneys or each of them to any and all amendments to
said Registration Statements.

     IN WITNESS  WHEREOF,  I have hereunder set my hand on the date set opposite
my signature.



Dated:        3/7/94                     /s/ Stephen K. West
                                         Stephen K. West


<PAGE>


                               POWER OF ATTORNEY


     I, the  undersigned  officer of Pioneer Money Market Trust and Pioneer U.S.
Government  Trust  (collectively,  the "Funds"),  each a Massachusetts  business
trust, do hereby  constitute and appoint John F. Cogan, Jr., Joseph P. Barri and
William H. Keough, and each of them acting singly, to be my true, sufficient and
lawful  attorneys,  with  full  power to each of them,  and each of them  acting
singly,  to sign for me, in my name and in the  capacity  indicated  below,  the
Registration  Statements  on  Forms  N-14 to be  filed by the  Funds  under  the
Investment  Company Act of 1940,  as amended,  and under the  Securities  Act of
1933,  as  amended,  and any and all  amendments  thereto  with  respect  to the
offering of the Funds' shares of beneficial interest,  no par value, and any and
all other  documents and papers relating  thereto,  and generally to do all such
things in my name and on my behalf in the capacity indicated to enable the Funds
to  comply  with  the  Investment  Company  Act of  1940,  as  amended,  and the
Securities Act of 1933, as amended,  and all  requirements of the Securities and
Exchange Commission thereunder,  hereby ratifying and confirming my signature as
it may be signed by said  attorneys or each of them to any and all amendments to
said Registration Statements.

     IN WITNESS  WHEREOF,  I have hereunder set my hand on the date set opposite
my signature.



Dated:        3/7/94                    /s/ William H. Keough
                                        William H. Keough





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