PIONEER SHORT TERM INCOME TRUST
N-30D, 1998-01-28
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[Pioneer Logo]

Pioneer
Short-Term Income
Trust

ANNUAL REPORT 11/30/97
<PAGE>

Table of Contents
- --------------------------------------------------------------------------------

   
<TABLE>
<S>                                                                         <C>
Letter from the Chairman                                                     1
Portfolio Summary                                                            2
Performance Update                                                           3
Portfolio Management Discussion                                              5
Schedule of Investments                                                      8
Financial Statements                                                        14
Notes to Financial Statements                                               19
Report of Independent Public Accountants                                    23
Trustees, Officers and Service Providers                                    24
Retirement Plans from Pioneer                                               25
Programs and Services for Pioneer Shareowners                               26
The Pioneer Family of Mutual Funds                                          29
</TABLE>
    

<PAGE>

Pioneer Short-Term Income Trust

LETTER FROM THE CHAIRMAN 11/30/97
 Dear Shareowner,
- --------------------------------------------------------------------------------
   
I am pleased to introduce this report for Pioneer Short-Term Income Trust,
covering its fiscal year ended November 30, 1997. On behalf of the Fund's
investment team, I thank you for your interest and this opportunity to comment
briefly on today's investing environment.

During the Fund's last fiscal quarter, demand in the U.S. bond market soared as
the world's stock markets demonstrated exceptional volatility. Asian markets
plunged after languishing for several months as they digested currency and
economic changes. Here in the United States, the Dow Jones Industrial Average
took a break from its exhilarating upward climb to experience - in the space of
two days - both its biggest one-day point drop and its biggest one-day point
gain. European markets bounced around, shaken by the drop in Asia and then
heartened by the speedy U.S. rebound. Even Latin American markets were
affected, mostly in a chain reaction from nervous investors.

After consecutive quarters of robust growth in stocks, this fast-paced change
forced a lot of investors to rethink their investment strategy. Many concerned
investors have moved away from stocks and into high-quality, fixed-income
securities - like those held by your Fund - to shelter their portfolio. We have
always believed it is important to allocate your assets across both stock and
bond investments and recent market conditions demonstrate this importance.

I encourage you to read on to learn more about your Fund. Please contact your
investment representative, or us at 1-800-225-6292, if you have questions about
Pioneer Short-Term Income Trust.
    

Respectfully,

/s/ John F. Cogan, Jr.

John F. Cogan, Jr.,
Chairman and President

                                                                               1
<PAGE>

Pioneer Short-Term Income Trust
PORTFOLIO SUMMARY 11/30/97

Portfolio Diversification
- --------------------------------------------------------------------------------
(As a percentage of total investment portfolio)

U.S. Government Agency Obligations               74%
Corporate Bonds                                  16%
U.S. Government Obligations                       9%
Short-Term Cash Equivalents                       1%


Portfolio Quality
- --------------------------------------------------------------------------------
(As a percentage of debt holdings)

Treasury/Agency                                  83%
AAA                                               5%
AA                                                2%
A                                                 5%
BBB                                               5%


10 Largest Holdings
- --------------------------------------------------------------------------------
(As a percentage of debt holdings)

   
 1. U.S. Treasury Notes, 7.75%, 1999                                      6.71%
 2. Federal National Mortgage Association, Medium Term Note, 7.11%, 2000  2.28
 3. Tennessee Valley Authority, 8.375%, 1999                              2.25
 4. Federal National Mortgage Association, Medium Term Note, 7.17%, 2001  2.18
 5. Federal National Mortgage Association, Medium Term Note, 7.3%, 2000   2.17
 6. Federal National Mortgage Association, Medium Term Note, 7.0%, 2001   2.17
 7. Federal Home Loan Mortgage Corp., Global Notes, 6.85%, 2000           2.17
 8. Federal Home Loan Mortgage Corp., REMIC Series 1243H, 7.5%, 2004      2.16
 9. Federal Home Loan Mortgage Corp., REMIC Series 1145G, 8.0%, 2006      1.97
10. Premier Auto Trust, Series 1995-2A6, 7.2%, 1999                       1.91
    

Fund holdings will vary for other periods.

2
<PAGE>

Pioneer Short-Term Income Trust
PERFORMANCE UPDATE 11/30/97                             CLASS A SHARES

Share Prices and Distributions
- --------------------------------------------------------------------------------

<TABLE>
<S>                         <C>            <C>                 <C>
Net Asset Value
per Share                  11/30/97       11/30/96
                           $3.77          $3.79
                           Income         Short-Term          Long-Term
Distributions per Share
(11/30/96-11/30/97)       Dividends      Capital Gains       Capital Gains
                           $0.227             -                   -

</TABLE>

Investment Returns
- --------------------------------------------------------------------------------
The mountain chart on the right shows the growth of a $10,000 investment made
in Pioneer Short-Term Income Trust at public offering price, compared to the
growth of the Merrill Lynch 1-3 Year Government Bond Index.

 
[boxed text]
Average Annual Total Returns
(As of November 30, 1997)
 
                 Net Asset     Public Offering
Period             Value         Price*
Life-of-Fund       5.21%         4.72%
(8/10/92)
5 Year             5.37          4.85
1 Year             5.64          2.93

* Reflects deduction of the maximum
  2.5% sales charge at the beginning
  of the period and assumes reinvest-
  ment of distributions at net asset
  value.

[mountain chart]
Growth of $10,000 [dagger]

        Pioneer Short-Term                Merrill Lynch 1-3 Year
            Income Trust*                  Government Bond Index  
08/31/92        9,750                              10,000
11/30/92        9,809                              10,018
05/31/92       10,204                              10,372
11/30/93       10,424                              10,623
05/31/94       10,466                              10,586
11/30/94       10,457                              10,697
05/31/95       11,122                              11,375
11/30/95       11,466                              11,810
05/31/96       11,606                              11,975
11/30/96       12,062                              12,494
05/30/97       12,332                              12,766
11/30/97       12,743                              13,235

+   Index comparison begins 8/31/92. The Merrill Lynch 1-3 Year Government Bond
    Index is an unmanaged, composite index of debt obligations of the U.S.
    Treasury and U.S. government agencies (excluding mortgage-backed
    securities). All issues have a maturity of at least one year and no more
    than three years. Index returns are calculated monthly, assume reinvestment
    of dividends and, unlike Fund returns, do not reflect any fees, expenses or
    sales charges. You cannot invest directly in the Index.

    Past performance does not guarantee future results. Return and share price
    fluctuate, and your shares, when redeemed, may be worth more or less than
    their original cost.

                                                                               3

<PAGE>

Pioneer Short-Term Income Trust
PERFORMANCE UPDATE 11/30/97                             CLASS B SHARES

Share Prices and Distributions
- --------------------------------------------------------------------------------

<TABLE>
<S>                         <C>            <C>                 <C>
Net Asset Value
per Share                  11/30/97       11/30/96
                           $3.76          $3.79
                           Income         Short-Term          Long-Term
Distributions per Share
(11/30/96-11/30/97)       Dividends      Capital Gains       Capital Gains
                           $0.199             -                    -

</TABLE>

Investment Returns
- --------------------------------------------------------------------------------
The mountain chart on the right shows the growth of a $10,000 investment made
in Pioneer Short-Term Income Trust, compared to the growth of the Merrill Lynch
1-3 Year Government Bond Index.

[boxed text]
 Average Annual Total Returns
  (As of November 30, 1997)

                   If          If
Period            Held      Redeemed*
Life-of-Fund      4.78%     4.78%
(4/4/94)
1 Year            4.60       2.60


* Reflects deduction of the maximum
  2.5% sales charge at the beginning
  of the period and assumes reinvest-
  ment of distributions at net asset
  value.

[mountain chart]
Growth of $10,000[dagger]

        Pioneer Short-Term                Merrill Lynch 1-3 Year
            Income Trust*                 Government Bond Index
04/30/94       10,000                              10,000
05/31/94        9,987                              10,014
11/30/94        9,961                              10,119
05/31/95       10,539                              10,761
11/30/95       10,850                              11,172
05/31/96       10,910                              11,328
11/30/96       11,325                              11,819
05/31/97       11,521                              12,077
11/30/97       11,845                              12,520



+   Index comparison begins 4/30/94. The Merrill Lynch 1-3 Year Government Bond
    Index is an unmanaged, composite index of debt obligations of the U.S.
    Treasury and U.S. government agencies (excluding mortgage-backed
    securities). All issues have a maturity of at least one year and no more
    than three years. Index returns are calculated monthly, assume reinvestment
    of dividends and, unlike Fund returns, do not reflect any fees, expenses or
    sales charges. You cannot invest directly in the Index.

    Past performance does not guarantee future results. Return and share price
    fluctuate, and your shares, when redeemed, may be worth more or less than
    their original cost.

4

<PAGE>

Pioneer Short-Term Income Trust

PORTFOLIO MANAGEMENT DISCUSSION 11/30/97

Dear Shareowner,
- --------------------------------------------------------------------------------
   
It is with pleasure that I introduce this annual report for Pioneer Short-Term
Income Trust, covering the 12 months ended November 30, 1997. Fixed-income
investments fared well for the year, enjoying declining interest rates in the
past six months after facing rising interest rates during the first half of the
fiscal year.

As a whole, short-term income funds performed well. According to Lipper
Analytical Services, an independent firm that reports mutual fund performance,
the 100 short-term income funds it tracked generated an average total return of
5.51% for the year ended November 30, 1997. For the same time period, your Fund
finished slightly ahead of the pack, posting a healthy 5.64% total return for
Class A Shares and 4.60% total return for Class B Shares. (Returns are for the
one-year period and are based on share price at net asset value with all
dividends reinvested.)

Despite mixed conditions in the fixed-income market, the Fund met its objective
of providing high current income and a relatively stable share price. Class A
Shares of the Fund paid a total of $0.227 per share in monthly dividends and
had an attractive 30-day S.E.C. yield of 5.11% on November 30.

Fed Raises Rates, Bonds Bounce Back
Early in the year, it was evident the U.S. economy was growing at an
unsustainable rate. Unemployment had dropped to a 24-year low of 4.8%. With
fewer people available, companies are forced to attract workers with wage
increases. The result is higher costs for companies, which are passed on to the
consumer as higher prices for goods and services - starting the cycle of
inflation. After observing months of low unemployment, along with increased
factory output and strengthening consumer confidence, the Federal Reserve moved
to slow growth and stem inflation. The Fed raised short-term interest rates by
0.25 percentage points on March 25, boosting the Federal funds rate to 5.50%.
The hike, an effort to slow lending by increasing the rate banks charge one
another for overnight loans, was much expected and bond prices fell both before
and after the move.

                                                                               5
    
<PAGE>

Pioneer Short-Term Income Trust
PORTFOLIO MANAGEMENT DISCUSSION 11/30/97                (continued)
   
Toward the second half of the fiscal year, all but the shortest interest rates
declined as bond prices rose; Treasury bills suffered as foreign banks sold
them to support faltering currencies. Overall, however, bond investors reacted
favorably to the slower pace of economic growth that settled in, and the threat
of further Fed action passed. Indeed, the Fed's move in March was the only
change to rates it initiated in 1997.

Unprecedented volatility in the world's stock markets during the fourth quarter
also added to bonds' appeal. The Dow Jones Industrial Average of 30 "blue chip"
stocks plunged 554 points on October 27, its largest one-day point loss, when
Asian markets began to unwind, sparking sharp and sudden sell-offs in stocks
across the globe.

There is no doubt that the recent collapse of currencies and stocks markets in
places such as South Korea, Indonesia and Malaysia will have an impact on our
economy and monetary policy. So far, trouble overseas has had a positive effect
on U.S. bonds and probably stalled any further Fed action. It also created a
"flight to quality" as investors seek the historic stability that U.S.
government securities offer, a trend we expect to continue.

Portfolio Adjusts to Changing Market
We are pleased with the Fund's performance for the fiscal year. As always, we
maintained a high-quality portfolio of securities with remaining maturities of
five years or less. At fiscal year-end, the largest percentage of the
portfolio, 83%, was invested in securities of the U.S. government and its
agencies, a decrease from 89% at the midpoint of the year. Government
securities offer stability and attractive levels of income, trademarks of your
Fund, without the potential credit risk of non-government securities. We use
these easily traded issues to manage portfolio volatility. By fiscal year-end,
the Fund's duration was 1.42 years, which is on the lower end of the risk
spectrum. (Duration is a measure of price sensitivity to interest rates. The
longer the duration, the greater the change in response to a move in interest
rates.)
    

6
<PAGE>

Pioneer Short-Term Income Trust

   
Holding government securities also allows the Fund to easily raise cash for
unique buying opportunities as they arise. We saw several such opportunities in
the corporate sector this year. We always search for companies with improving
business and financial fundamentals that leave them likely to be upgraded in
credit quality. As corporate performance improved over the fiscal year, we
responded by adding companies such as Bank One and Discover Card Master. Both
companies possess domestic business lines, which boosts their balance sheets,
and maintain a stable track record of interest payments - exactly what we look
for in a non-government security. By fiscal year-end, corporate bonds accounted
for 16% of the portfolio and were a strong contribution to Fund performance.
This was the largest increase in allocation over the past year, up from 10% on
May 31 and 11% one year ago.

Looking Ahead
Currently, Fed policy on short-term interest rates is holding steady, as we
expect it will until overseas wrinkles are ironed out. We're seeing heightened
demand for high-quality issues, especially those backed by the U.S. government.
This has pushed up prices and sent interest rates falling. As we move into
1998, investors may decide to reduce their stock exposure by adding bonds. A
fund such as Pioneer Short-Term Income Trust, which invests in high-quality,
relatively short-term securities, offers the potential for greater price
stability than long-term stock and bond funds, and higher-current income
potential than savings accounts. We look forward to managing the Fund in the
coming months, and thank you for investing with Pioneer.
    

Respectfully,

/s/ Richard A. Schlanger

Richard A. Schlanger,
Portfolio Manager

                                                                               7
<PAGE>

 Pioneer Short-Term Income Trust
 SCHEDULE OF INVESTMENTS 11/30/97

<TABLE>
<CAPTION>
               S&P/Moody's
Principal      Ratings
Amount         (Unaudited)                                                     Value
<S>            <C>             <C>                                          <C>
                               INVESTMENT IN SECURITIES - 99.5%
                               Corporate Bonds - 16.7%
                               Asset-Backed - 4.3%
$ 600,000      AAA/Aaa         Carco Auto, Series 1997-1A, 6.689%,
                               2004                                         $  606,888
  875,000      AAA/Aaa         Premier Auto Trust, Series 1995-2A6,
                               7.2%, 1999                                      882,613
  500,000      AAA/Aaa         Sears Credit Account Master Trust, Series
                               1994-1A, 7.0%, 2004                             508,715
                                                                            ----------
                                                                            $1,998,216
                                                                            ----------
                               Financial - 8.5%
  500,000      AA-/Aa3         Associates Corp. N.A., 8.125%, 1998          $  501,415
  600,000      A+/A1           Bank One, 7.25%, 2002                           621,006
  500,000      AAA/Aaa         Discover Card Master, 6.792%, 2010              501,406
  500,000      A-/A2           First Interstate Bancorp, 8.15%, 2002           503,170
  500,000      A+/A1           Ford Motor Credit Co., 6.85%, 2000              507,220
  800,000      BBB/Baa2        Spieker Properties L.P., 6.8%, 2001             806,800
  500,000      A/A3            Transamerica Financial, 6.75%, 2000             504,910
                                                                            ----------
                                                                            $3,945,927
                                                                            ----------
                               Industrial - 3.9%
  500,000      BBB-/Baa2       A. H. Belo Corp., 6.875%, 2002               $  507,125
  780,000      BBB+/Baa1       Comdisco Inc., 6.5%, 2000                       785,577
  500,000      AA/Aa2          McDonalds Corp., 7.375%, 2002                   522,895
                                                                            ----------
                                                                            $1,815,597
                                                                            ----------
                               Total Corporate Bonds
                               (Cost $7,688,581)                            $7,759,740
                                                                            ----------
                               U.S. Government Obligations - 8.9%
  500,000                      U.S. Treasury Notes, 7.125%, 1999            $  511,530
3,000,000                      U.S. Treasury Notes, 7.75%, 1999              3,109,980
  500,000                      U.S. Treasury Notes, 6.25%, 2002                506,900
                                                                            ----------
                               Total U.S. Government Obligations
                               (Cost $4,214,531)                            $4,128,410
                                                                            ----------
                               U.S. Government Agency Obligations - 73.9%
  500,000                      Aid-Isreal, 7.75%, 1999                      $  515,950
  350,000                      Federal Home Loan Bank, 6.32%, 2001             349,853
</TABLE>

8    The accompanying notes are an integral part of these financial statements.
<PAGE>

Pioneer Short-Term Income Trust

<TABLE>
<CAPTION>
               S&P/Moody's
Principal      Ratings
Amount         (Unaudited)                                                  Value
<S>            <C>             <C>                                          <C>
                               U.S. Government Agency Obligations - (continued)
$ 500,000                      Federal Home Loan Bank, 6.36%, 2001          $ 500,615
  800,000                      Federal Home Loan Bank, 6.17%, 2002            800,024
  600,000                      Federal Home Loan Mortgage Corp.,           
                               6.29%, 2000                                    601,146
  500,000                      Federal Home Loan Mortgage Corp.,           
                               7.28%, 2000                                    503,495
  200,000                      Federal Home Loan Mortgage Corp.,           
                               7.38%, 2000                                    201,082
  300,000                      Federal Home Loan Mortgage Corp.,           
                               7.51%, 2000                                    301,452
  500,000                      Federal Home Loan Mortgage Corp.,           
                               7.645%, 2000                                   502,930
  500,000                      Federal Home Loan Mortgage Corp.,           
                               6.87%, 2001                                    505,075
  500,000                      Federal Home Loan Mortgage Corp.,           
                               6.92%, 2001                                    505,820
  500,000                      Federal Home Loan Mortgage Corp.,           
                               7.08%, 2002                                    502,315
1,000,000                      Federal Home Loan Mortgage Corp.,           
                               Global Notes, 6.85%, 2000                    1,005,250
   21,299                      Federal Home Loan Mortgage Corp.,           
                               REMIC Series 1319E, 7.0%, 2004                  21,274
1,000,000                      Federal Home Loan Mortgage Corp.,           
                               REMIC Series 1243H, 7.5%, 2004               1,002,969
  145,391                      Federal Home Loan Mortgage Corp.,           
                               REMIC Series 1238G, 7.25%, 2006                146,512
  422,794                      Federal Home Loan Mortgage Corp.,           
                               REMIC Series 1132I, 8.0%, 2006                 432,628
  888,375                      Federal Home Loan Mortgage Corp.,           
                               REMIC Series 1145G, 8.0%, 2006                 913,347
  321,885                      Federal Home Loan Mortgage Corp.,           
                               REMIC Series 1564J, 6.5%, 2008                 321,003
  556,259                      Federal Home Loan Mortgage Corp.,           
                               REMIC Series 1262F, 7.5%, 2015                 558,395
  231,101                      Federal Home Loan Mortgage Corp.,           
                               REMIC Series 153F, 7.75%, 2015                 232,201
</TABLE>                                                              

The accompanying notes are an integral part of these financial statements.    9
                                                                               
<PAGE>

 Pioneer Short-Term Income Trust
 SCHEDULE OF INVESTMENTS 11/30/97                        (continued)

<TABLE>
<CAPTION>
               S&P/Moody's
Principal      Ratings
Amount         (Unaudited)                                                      Value
<S>            <C>             <C>                                          <C>
                               U.S. Government Agency Obligations - (continued)
$ 157,877                      Federal Home Loan Mortgage Corp.,
                               REMIC Series 1311F, 7.5%, 2018               $ 158,229
  500,000                      Federal Home Loan Mortgage Corp.,         
                               REMIC Series 1281F, 8.0%, 2018                 508,800
  282,042                      Federal Home Loan Mortgage Corp.,         
                               REMIC Series 1358F, 6.75%, 2019                282,513
   76,591                      Federal Home Loan Mortgage Corp.,         
                               REMIC Series 1264F, 7.75%, 2019                 76,794
  200,151                      Federal Home Loan Mortgage Corp.,         
                               REMIC Series 186D, 8.0%, 2019                  200,215
  500,000                      Federal Home Loan Mortgage Corp.,         
                               REMIC Series 1142H, 7.95%, 2020                513,320
  530,440                      Federal Home Loan Mortgage Corp.,         
                               REMIC Series 112H, 8.8%, 2020                  542,449
  415,643                      Federal Home Loan Mortgage Corp.,         
                               REMIC Series 189C, 8.0%, 2021                  425,680
  369,101                      Federal Home Loan Mortgage Corp.,         
                               REMIC Series 1590K, 6.5%, 2023                 369,485
  235,000                      Federal National Mortgage Association,    
                               7.85%, 1998                                    238,614
  500,000                      Federal National Mortgage Association,    
                               6.45%, 2001                                    501,210
  635,000                      Federal National Mortgage Association,    
                               6.85%, 2002                                    638,480
  500,000                      Federal National Mortgage Association,    
                               Medium Term Note, 6.64%, 2000                  502,335
1,050,000                      Federal National Mortgage Association,    
                               Medium Term Note, 7.11%, 2000                1,056,836
  585,000                      Federal National Mortgage Association,    
                               Medium Term Note, 7.26%, 2000                  588,984
1,000,000                      Federal National Mortgage Association,    
                               Medium Term Note, 7.3%, 2000                 1,005,990
  600,000                      Federal National Mortgage Association,    
                               Medium Term Note, 6.4%, 2001                   601,086
  500,000                      Federal National Mortgage Association,    
                               Medium Term Note, 6.61%, 2001                  502,805
</TABLE>                                                              

10    The accompanying notes are an integral part of these financial statements.
<PAGE>

 Pioneer Short-Term Income Trust

<TABLE>
<CAPTION>
               S&P/Moody's
Principal      Ratings
Amount         (Unaudited)                                                      Value
<S>            <C>             <C>                                          <C>
                               U.S. Government Agency Obligations - (continued)
$ 500,000                      Federal National Mortgage Association,
                               Medium Term Note, 6.63%, 2001                $ 506,115
1,000,000                      Federal National Mortgage Association,      
                               Medium Term Note, 7.0%, 2001                 1,005,320
  285,000                      Federal National Mortgage Association,      
                               Medium Term Note, 7.04%, 2001                  287,725
1,000,000                      Federal National Mortgage Association,      
                               Medium Term Note, 7.17%, 2001                1,008,120
  300,000                      Federal National Mortgage Association,      
                               Medium Term Note, 6.36%, 2002                  302,217
  350,000                      Federal National Mortgage Association,      
                               Medium Term Note, 6.45%, 2002                  353,087
  300,000                      Federal National Mortgage Association,      
                               Medium Term Note, 6.52%, 2002                  303,390
  450,000                      Federal National Mortgage Association,      
                               Medium Term Note, 6.78%, 2002                  453,591
  500,000                      Federal National Mortgage Association,      
                               Medium Term Note, 6.97%, 2002                  505,830
  500,000                      Federal National Mortgage Association,      
                               Medium Term Note, 7.15%, 2002                  507,830
  257,074                      Federal National Mortgage Association,      
                               REMIC Series 1991-175E, 7.0%, 1998             257,300
  143,909                      Federal National Mortgage Association,      
                               REMIC Series G93-26PL, 7.0%, 1998              143,983
  355,753                      Federal National Mortgage Association,      
                               REMIC Series 1992-97DB, 8.0%, 1999             361,129
  469,236                      Federal National Mortgage Association,      
                               REMIC Series 1992-40G, 7.0%, 2002              469,945
  377,401                      Federal National Mortgage Association,      
                               REMIC Series 1992-145J, 7.15%, 2003            383,232
  500,000                      Federal National Mortgage Association,      
                               REMIC Series 1992-110G, 7.0%, 2005             502,585
  300,000                      Federal National Mortgage Association,      
                               REMIC Series 1991-119M, 8.5%, 2008             308,988
  354,545                      Federal National Mortgage Association,      
                               REMIC Series 1992-84G, 7.5%, 2014              356,428
</TABLE>                                                                

The accompanying notes are an integral part of these financial statements.   11
                                                                              
<PAGE>

 Pioneer Short-Term Income Trust
 SCHEDULE OF INVESTMENTS 11/30/97                        (continued)

<TABLE>
<CAPTION>
              S&P/Moody's
Principal     Ratings
Amount        (Unaudited)                                                    Value
<S>           <C>             <C>                                             <C>
                              U.S. Government Agency Obligations - (continued)
$ 29,056                      Federal National Mortgage Association,
                              REMIC Series 1992-132PE, 7.25%, 2015            $28,937
 240,327                      Federal National Mortgage Association,         
                              REMIC Series 1992-171PB, 6.5%, 2017             240,147
 502,213                      Federal National Mortgage Association,         
                              REMIC Series 1988-26C, 7.5%, 2018               511,173
  27,949                      Federal National Mortgage Association,         
                              REMIC Series 1992-43B, 7.5%, 2018                27,894
 152,605                      Federal National Mortgage Association,         
                              REMIC Series 1990-8E, 8.5%, 2018                153,681
 500,000                      Federal National Mortgage Association,         
                              REMIC Series 1993-23PJ, 6.7%, 2019              503,015
 550,000                      Federal National Mortgage Association,         
                              REMIC Series 1993-17PE, 6.75%, 2019             550,006
 776,843                      Federal National Mortgage Association,         
                              REMIC Series 1992-131G, 7.25%, 2019             779,858
  80,603                      Federal National Mortgage Association,         
                              REMIC Series 1990-48G, 7.95%, 2019               80,651
 500,000                      Federal National Mortgage Association,         
                              REMIC Series 1991-169PJ, 7.0%, 2020             503,265
 189,819                      Federal National Mortgage Association,         
                              REMIC Series G92-35C, 7.5%, 2020                191,983
  44,092                      Federal National Mortgage Association,         
                              REMIC Series 1991-74J, 7.95%, 2020               44,006
 175,800                      Federal National Mortgage Association,         
                              REMIC Series 1991-103HB, 8.75%, 2020            177,060
  68,466                      Federal National Mortgage Association,         
                              REMIC Series 1992-77G, 8.0%, 2021                69,182
 124,586                      Federal National Mortgage Association,         
                              REMIC Series 1992-64M, 7.0%, 2022               125,129
 500,000                      Federal Farm Credit Bank, Medium Term          
                              Note, 7.79%, 1997                               500,210
 500,000                      Federal Farm Credit Bank, Medium Term          
                              Note, 6.62%, 2001                               502,500
 250,000                      Federal Farm Credit Bank, Medium Term          
                              Note, 7.3%, 2001                                252,943
</TABLE>                                                               

12   The accompanying notes are an integral part of these financial statements.
<PAGE>

 Pioneer Short-Term Income Trust
 

   
<TABLE>
<CAPTION>
               S&P/Moody's
Principal      Ratings
Amount         (Unaudited)                                                     Value
<S>            <C>             <C>                                          <C>
                               U.S. Government Agency Obligations - (continued)
$ 500,000                      Federal Farm Credit Bank, Medium Term
                               Note, 6.42%, 2002                            $   500,625
  500,000                      Federal Farm Credit Bank, Medium Term
                               Note, 6.59%, 2002                                502,054
1,000,000                      Tennessee Valley Authority, 8.375%, 1999       1,042,400
                                                                            -----------
                               Total U.S. Government Agency Obligations
                               (Cost $34,482,270)                           $34,440,695
                                                                            -----------
                               TOTAL INVESTMENT IN SECURITIES
                               (Cost $46,385,382)                           $46,328,845
                                                                            -----------
                               TEMPORARY CASH INVESTMENT - 0.5%
                               Commercial Paper - 0.5%
  247,000                      Household Finance Corp., 5.70%,
                               12/01/97                                     $   247,000
                                                                            -----------
                               TOTAL TEMPORARY CASH INVESTMENT
                               (Cost $247,000)                              $   247,000
                                                                            -----------
                               TOTAL INVESTMENT IN SECURITIES AND
                               TEMPORARY CASH INVESTMENT - 100%
                               (Cost $46,632,382) (a) (b)                   $46,575,845
                                                                            -----------

(a) At November 30, 1997, the net unrealized loss on investments based on cost
    for federal income tax purposes of $46,632,382 was as follows:
    Aggregate gross unrealized gain for all investments in which there is an
    excess of value over tax cost                                             $ 209,845

    Aggregate gross unrealized loss for all investments in which there is an
    excess of tax cost over value                                              (266,382)
                                                                              ----------
    Net unrealized loss                                                        $(56,537)
                                                                              ----------

(b) At November 30, 1997, the Fund had a net capital loss carryforward of
    $3,365,002 which will expire between 2000 and 2005 if not utilized.
    
Purchases and sales of securities (excluding temporary cash investments) for
the year ended November 30, 1997 were as follows:

<S>                                                          <C>              <C>
                                                              Purchases          Sales
                                                              ---------         -------
Long-term U.S. Government                                    $10,905,979      $22,784,828
Other Long-term Securities                                     4,033,687        2,561,771
</TABLE>                                                 
                           
 

The accompanying notes are an integral part of these financial statements.   13
                                                                              
<PAGE>

Pioneer Short-Term Income Trust
BALANCE SHEET 11/30/97

   
<TABLE>
<S>                                                                          <C>
ASSETS:
  Investment in securities, at value (including temporary cash investment
    of $247,000) (cost $46,632,382)                                          $46,575,845
  Cash                                                                               764
  Receivables -
   Fund shares sold                                                              106,301
   Interest                                                                      664,749
  Due from Pioneering Management Corporation                                      52,067
  Other                                                                            4,406
                                                                             -----------
    Total assets                                                             $47,404,132
                                                                             -----------
LIABILITIES:
  Payables -
   Fund shares repurchased                                                   $    27,074
   Dividends                                                                      51,368
  Due to affiliates                                                               39,964
  Accrued expenses                                                                40,100
                                                                             -----------
    Total liabilities                                                        $   158,506
                                                                             -----------
NET ASSETS:
  Paid-in capital                                                            $50,669,174
  Accumulated distributions in excess of net investment income                   (10,351)
  Accumulated net realized loss on investments                                (3,356,660)
  Net unrealized loss on investments                                             (56,537)
                                                                             -----------
    Total net assets                                                         $47,245,626
                                                                             -----------
NET ASSET VALUE PER SHARE:
  (Unlimited number of shares authorized)
  Class A (based on $42,058,284/11,150,229 shares)                           $      3.77
                                                                             -----------
  Class B (based on $5,187,342/1,377,961 shares)                             $      3.76
                                                                             -----------
MAXIMUM OFFERING PRICE:
  Class A                                                                    $      3.87
                                                                             -----------
</TABLE>
    

14   The accompanying notes are an integral part of these financial statements.
<PAGE>

Pioneer Short-Term Income Trust
STATEMENT OF OPERATIONS

For the Year Ended 11/30/97

<TABLE>
<CAPTION>
INVESTMENT INCOME:
<S>                                                         <C>           <C>
  Interest                                                                 $3,538,771
                                                                           ----------
EXPENSES:
  Management fees                                           $253,266
  Transfer agent fees
   Class A                                                    91,314
   Class B                                                    12,426
  Distribution fees
   Class A                                                   114,554
   Class B                                                    48,316
  Accounting                                                  83,088
  Custodian fees                                              18,666
  Registration fees                                           36,740
  Professional fees                                           41,900
  Printing                                                    18,300
  Fees and expenses of nonaffiliated trustees                 15,808
  Miscellaneous                                               36,127
                                                            --------
    Total expenses                                                         $  770,505
    Less management fees waived and expenses
      reimbursed by Pioneering Management
      Corporation                                                            (289,028)
    Less fees paid indirectly                                                 (11,675)
                                                                           ----------
    Net expenses                                                           $  469,802
                                                                           ----------
     Net investment income                                                 $3,068,969
                                                                           ----------
REALIZED AND UNREALIZED LOSS ON INVESTMENTS:
  Net realized loss on investments                                         $ (315,856)
  Change in net unrealized gain on investments                                (88,164)
                                                                           ----------
   Net loss on investments                                                 $ (404,020)
                                                                           ----------
   Net increase in net assets resulting from operations                    $2,664,949
                                                                           ----------
</TABLE>

The accompanying notes are an integral part of these financial statements.   15
                                                                              
<PAGE>

Pioneer Short-Term Income Trust
STATEMENTS OF CHANGES IN NET ASSETS

For the Years Ended 11/30/97 and 11/30/96

   
<TABLE>
<CAPTION>
                                                                 Year Ended         Year Ended
FROM OPERATIONS:                                                  11/30/97           11/30/96
<S>                                                           <C>                <C>
Net investment income                                         $  3,068,969       $ 3,404,164
Net realized loss on investments                                  (315,856)         (248,627)
Change in net unrealized gain on investments                       (88,164)         (351,256)
                                                              ------------       -----------
  Net increase in net assets resulting from operations
                                                              $  2,664,949       $ 2,804,281
                                                              ------------       -----------
DISTRIBUTIONS TO SHAREHOLDERS:
Net investment income:
  Class A ($0.23 and $0.24 per share, respectively)             (2,774,220)       (3,222,631)
  Class B ($0.20 and $0.21 per share, respectively)               (257,396)         (197,640)
In excess of net investment income:
  Class A ($0.00 and $0.00 per share, respectively)                     --           (25,178)
  Class B ($0.00 and $0.01 per share, respectively)                     --           (23,437)
                                                              ------------       -----------
   Total distributions to shareholders
                                                              $ (3,031,616)      $(3,468,886)
                                                              ------------       -----------
FROM FUND SHARE TRANSACTIONS:
Net proceeds from sale of shares                              $ 35,938,522       $32,092,020
Reinvestment of distributions                                    2,292,014         2,552,698
Cost of shares repurchased                                     (50,223,665)      (31,158,433)
                                                              ------------       -----------
  Net increase (decrease) in net assets resulting from
    fund share transactions                                   $(11,993,129)      $ 3,486,285
                                                              ------------       -----------
  Net increase (decrease) in net assets
                                                              $(12,359,796)      $ 2,821,680
NET ASSETS:
Beginning of year                                               59,605,422        56,783,742
                                                              ------------       -----------
End of year (including accumulated distributions in excess
  of net investment income of $10,351 and $48,615,
  respectively)                                               $ 47,245,626       $59,605,422
                                                              ------------       -----------
</TABLE>
    

   
<TABLE>
<CAPTION>
<S>                             <C>              <C>              <C>             <C>
CLASS A                          '97 Shares        '97 Amount      '96 Shares      '96 Amount
Shares sold                          6,898,656    $  25,945,608       6,451,953    $24,450,587
Reinvestment of distributions          562,149        2,116,959         635,331      2,410,126
Less shares repurchased            (10,708,837)     (40,309,982)     (6,697,289)  (25,468,788)
                                   -----------    -------------      ----------   ------------
  Net increase (decrease)           (3,248,032)   $ (12,247,415)        389,995   $ 1,391,925
                                   -----------    -------------      ----------   ------------
CLASS B
Shares sold                          2,657,915    $   9,992,914       2,013,404   $ 7,641,433
Reinvestment of distributions           46,605          175,055          37,660       142,572
Less shares repurchased             (2,638,370)      (9,913,683)     (1,499,135)   (5,689,645)
                                   -----------    -------------      ----------   ------------
  Net increase                          66,150    $     254,286         551,929   $ 2,094,360
                                   -----------    -------------      ----------   ------------
</TABLE>
    

                                        

16   The accompanying notes are an integral part of these financial statements.
<PAGE>

   
<TABLE>
<CAPTION>
Pioneer Short-Term Income Trust
FINANCIAL HIGHLIGHTS 11/30/97
                                                                 Year Ended   Year Ended   Year Ended    Year Ended   Year Ended
CLASS A                                                           11/30/97     11/30/96     11/30/95    11/30/94(a)    11/30/93
<S>                                                               <C>          <C>          <C>           <C>          <C>
Net asset value, beginning of year                                $  3.79      $  3.84      $  3.75       $ 3.95       $ 3.95
                                                                  -------      -------      -------       ------       ------
Increase (decrease) from investment operations:
 Net investment income                                            $  0.21      $  0.24      $  0.25       $ 0.22       $ 0.24
 Net realized and unrealized gain (loss) on investments                --        (0.05)        0.10         (0.21)     $   --
                                                                  -------      -------      -------       -------      ------
  Net increase from investment operations                         $  0.21      $  0.19      $  0.35       $ 0.01       $ 0.24
Distributions to shareholders:
 Net investment income                                              (0.23)       (0.24)       (0.26)        (0.21)       (0.24)
                                                                  -------      -------      -------       -------      -------
Net increase (decrease) in net asset value                        $ (0.02)     $ (0.05)     $  0.09       $ (0.20)     $   --
                                                                  -------      -------      -------       -------      -------
Net asset value, end of year                                      $  3.77      $  3.79      $  3.84       $ 3.75       $ 3.95
                                                                  -------      -------      -------       -------      -------
Total return*                                                        5.64%        5.20%        9.64%         0.32%        6.28%
Ratio of net expenses to average net assets                          0.87%+       0.87%+       0.86%+        0.85%        0.66%
Ratio of net investment income to average net assets                 6.10%+       6.25%+       6.43%+        5.89%        5.80%
Portfolio turnover rate                                                31%          65%         110%          144%          83%
Net assets, end of year (in thousands)                            $42,058      $54,637      $53,860       $59,088      $57,482
Ratios assuming no waiver of management fees and assumption of
 expenses by PMC and no reduction for fees paid indirectly:
 Net expenses                                                        1.44%        1.33%        1.38%         1.20%        1.33%
 Net investment income                                               5.53%        5.79%        5.92%         5.54%        5.13%
Ratios assuming waiver of management fees and assumption of
 expenses by PMC and reduction for fees paid indirectly:
 Net expenses                                                        0.85%        0.85%        0.85%           --           --
 Net investment income                                               6.12%        6.27%        6.44%           --           --
</TABLE>
    

(a) The per share data presented above is based upon the average shares
    outstanding for the period presented.

*   Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of 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.

+   Ratio assuming no reduction for fees paid indirectly.


The accompanying notes are an integral part of these financial statements.   17
<PAGE>

   
<TABLE>
<CAPTION>
Pioneer Short-Term Income Trust
FINANCIAL HIGHLIGHTS 11/30/97
                                                                          Year Ended   Year Ended   Year Ended      4/4/94 to
CLASS B                                                                    11/30/97   11/30/96     11/30/95      11/30/94(a)
<S>                                                                        <C>          <C>          <C>           <C>
Net asset value, beginning of period                                       $ 3.79       $ 3.85       $ 3.75        $  3.89
                                                                           ------       --------     ------        -------
Increase (decrease) from investment operations:                                       
 Net investment income                                                     $ 0.20       $ 0.21       $ 0.22        $  0.15
 Net realized and unrealized gain (loss) on investments                     (0.03)       (0.05)        0.11          (0.16)
                                                                           ------       ------       ------        -------
  Net increase (decrease) from investment operations                       $ 0.17       $ 0.16       $ 0.33        $ (0.01)
Distributions to shareholders:                                                        
 Net investment income                                                      (0.20)       (0.21)       (0.23)        (0.13)
 In excess of net investment income                                            --        (0.01)          --            --
                                                                           ------       ------       ------       -------
Net increase (decrease) in net asset value                                 $(0.03)      $(0.06)      $ 0.10        $ (0.14)
                                                                           ------       ------       ------        -------
Net asset value, end of period                                             $ 3.76       $ 3.79       $ 3.85        $  3.75
                                                                           ------       ------       ------        -------
Total return*                                                                4.60%        4.37%        8.93%         (0.24)%
Ratio of net expenses to average net assets                                  1.67%+       1.69%+       1.63%+         1.41% **
Ratio of net investment income to average net assets                         5.29%+       5.40%+       5.61%+         6.05% **
Portfolio turnover rate                                                        31%          65%         110%           144%
Net assets, end of period (in thousands)                                   $5,187       $4,969       $2,924        $ 3,182
Ratios assuming no waiver of management fees and assumption of expenses               
 by PMC and no reduction for fees paid indirectly:                                    
 Net expenses                                                                2.25%        2.15%        2.17%          1.82%**
 Net investment income                                                       4.71%        4.94%        5.08%          5.64%**
Ratios assuming waiver of management fees and assumption of expenses by               
 PMC and reduction for fees paid indirectly:                                          
 Net expenses                                                                1.66%        1.67%        1.60%           --
 Net investment income                                                       5.30%        5.42%        5.64%           --
</TABLE>                                                       
    

   
(a) The per share data presented above is based upon the average shares
    outstanding for the period presented.

*   Assumes initial investment at net asset value at the beginning of each
    period, reinvestment of 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.

+   Ratio assuming no reduction for fees paid indirectly.
    

18   The accompanying notes are an integral part of these financial statements.
<PAGE>

Pioneer Short-Term Income Trust
NOTES TO FINANCIAL STATEMENTS 11/30/97

1. Organization and Significant Accounting Policies

Pioneer Short-Term Income Trust (the Trust) is a Massachusetts business trust
registered under the Investment Company Act of 1940 as a diversified, open-end
management investment company. The Trust's investment objective is to seek a
high level of current income consistent with a high level of principal
stability.

The Trust offers two classes of shares - Class A and Class B shares. Shares of
Class A and Class B each represent an interest in the same portfolio of
investments of the Trust and have equal rights to voting, redemptions,
dividends and liquidation, except that each class of shares can bear different
transfer agent and distribution fees and have exclusive voting rights with
respect to the distribution plans that have been adopted by Class A and Class B
shareholders, respectively.

The Trust's financial statements have been prepared in conformity with
generally accepted accounting principles that require the management of the
Trust to, among other things, make estimates and assumptions that affect the
reported amounts of assets and liabilities, the disclosure of contingent assets
and liabilities at the date of the financial statements, and the reported
amounts of revenues and expenses during the reporting periods. Actual results
could differ from those estimates. 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. Security Valuation
   Security transactions are recorded on trade date. Securities are valued based
   on valuations furnished by independent pricing services that utilize matrix
   systems. These matrix systems reflect such factors as security prices,
   yields, maturities and ratings and are supplemented by dealer and exchange
   quotations and fair market value information from other sources, as required.
   Principal amounts of mortgage-backed securities are adjusted for monthly
   paydowns. Premium and discount related to certain mortgage-backed securities
   are amortized or accreted in proportion to the underlying monthly paydowns.
   Interest income is recorded on the accrual basis. Temporary cash investments
   are valued at amortized cost.

   Gains and losses on 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 to first select for sale those securities

                                                                              19
<PAGE>

Pioneer Short-Term Income Trust
NOTES TO FINANCIAL STATEMENTS 11/30/97                  (continued)

  that have the highest cost and also qualify for long-term capital gain or
  loss treatment for tax purposes.

B. Federal Income 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 taxable income and net realized capital gains, if any, to its
   shareholders. Therefore, no federal income tax provision is required.

   The characterization of distributions to shareholders for financial reporting
   purposes is determined in accordance with federal income tax rules.
   Therefore, the source of the Trust's distributions may be shown in the
   accompanying financial statements as either from or in excess of net
   investment income or net realized gain on investment transactions, or from
   paid-in capital, depending on the type of book/tax differences that may
   exist.

   At November 30, 1997, the Trust reclassified $15,773 and $911 from
   accumulated net realized loss on investments and accumulated distributions in
   excess of net investment income, respectively, to paid-in capital. The
   reclassification has no impact on the net asset value of the Trust and is
   designed to present the Trust's capital accounts on a tax basis.

C. Trust Shares
   The Trust records sales and repurchases of its shares on trade date. Net
   losses, if any, as a result of cancellations are absorbed by Pioneer Funds
   Distributor, Inc. (PFD), the principal underwriter for the Trust and an
   indirect subsidiary of The Pioneer Group, Inc. (PGI). PFD earned $16,197 in
   underwriting commissions on the sale of trust shares during the year ended
   November 30, 1997.

D. Class Allocations
   Distribution fees are calculated based on the average daily net assets
   attributable to Class A and Class B shares of the Trust, respectively.
   Shareholders of each class share all expenses and fees paid to the transfer
   agent, 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 expense (see Note 3). Income, common
   expenses and realized and unrealized gains and losses are calculated at the
   Trust level and allocated daily to each class of shares based on the
   respective percentage of adjusted net assets at the beginning of the day.

20
<PAGE>

 Pioneer Short-Term Income Trust

  The Trust declares as daily dividends substantially all of its net
  investment income. All dividends are paid on a monthly basis. Short-term
  capital gain distributions, if any, may be declared with the daily
  dividends. Distributions to shareholders are recorded as of the ex-dividend
  date. Distributions paid by the Trust with respect to each class of shares
  are calculated in the same manner, at the same time, and in the same amount,
  except that Class A and Class B shares can bear different transfer agent and
  distribution fees.

E. Repurchase Agreement
   With respect to repurchase agreements entered into by the Trust, the value of
   the underlying securities (collateral), including accrued interest received
   from counterparties, is required to be at least equal to or in excess of the
   value of the repurchase agreement at the time of purchase. The collateral for
   all repurchase agreements is held in safekeeping in the customer-only account
   of the Trust's custodian, or subcustodians. The Trust's investment adviser,
   Pioneering Management Corporation (PMC), is responsible for determining that
   the value of the collateral remains at least equal to the repurchase price.

2. Management Agreement
PMC manages the Trust's portfolio and is a wholly owned subsidiary of PGI.
Management fees are calculated daily at the annual rate of 0.50% of the Trust's
average daily net assets up to $100 million; 0.45% of the next $200 million;
and 0.40% of the excess over $300 million.

PMC has agreed not to impose a portion of its management fee and to assume
other operating expenses of the Trust to the extent necessary to limit Class A
expenses to 0.85% of the average daily net assets attributable to Class A
shares; the portion of the Trust-wide expenses attributable to Class B shares
will be reduced only to the extent that such expenses are reduced for Class A
shares. PMC's agreement is voluntary and temporary and may be revised or
terminated at any time.

In addition, under the management agreement, certain other services and costs,
including accounting, regulatory reporting and insurance premiums, are paid by
the Trust.

                                                                              21
<PAGE>

 Pioneer Short-Term Income Trust
 NOTES TO FINANCIAL STATEMENTS 11/30/97                  (continued)

3. Transfer Agent
PSC, a wholly owned subsidiary of PGI, provides substantially all transfer
agent and shareholder services to the Trust at negotiated rates. Included in
due to affiliates is $17,784 in transfer agent fees payable to PSC at November
30, 1997.

4. Distribution Plans
The Trust adopted a Plan of Distribution for each class of shares (Class A Plan
and Class B Plan) in accordance with Rule 12b-1 of the Investment Company Act
of 1940. Pursuant to the Class A Plan, the Trust pays PFD a service fee of up
to 0.25% of the Trust's average daily net assets in reimbursement of its actual
expenditures to finance activities primarily intended to result in the sale of
Class A shares. Pursuant to the Class B Plan, the Trust pays PFD 1.00% of the
average daily net assets attributable to the Class B shares. The fee consists
of a 0.25% service fee and a 0.75% distribution fee paid as compensation for
personal services and/or account maintenance services or distribution services
with regard to Class B shares. Included in due to affiliates is $22,180 in
distribution fees payable to PFD at November 30, 1997.

In addition, redemptions of each class of shares may be subject to a contingent
deferred sales charge (CDSC). A CDSC of 0.50% may be imposed on redemptions of
certain net asset value purchases of Class A shares within one year of
purchase. Class B shares that are redeemed within three years of purchase are
subject to a CDSC at declining rates beginning at 2.0%, based on the lower of
cost or market value of shares being redeemed. Proceeds from the CDSC are paid
to PFD. For the year ended November 30, 1997, CDSCs in the amount of $47,504
were paid to PFD.

5. Expense Offsets
The Trust has entered into certain expense offset arrangements resulting in a
reduction in the Trust's total expenses. For the year ended November 30, 1997,
the Trust's expenses were reduced by $11,675 under such arrangements.

22
<PAGE>

Pioneer Short-Term Income Trust
REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Shareholders and the Board of Trustees of
Pioneer Short-Term Income Trust:

We have audited the accompanying balance sheet, including the schedule of
investments, of Pioneer Short-Term Income Trust, as of November 30, 1997, and
the related statement of operations, statements of changes in net assets and
the financial highlights for the periods presented. These financial statements
and financial highlights are the responsibility of the Trust's management. Our
responsibility is to express an opinion on these financial statements and
financial highlights based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. 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
November 30, 1997 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 presentation.
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
Pioneer Short-Term Income Trust as of November 30, 1997, the results of its
operations, the changes in its net assets and the financial highlights for the
periods presented, in conformity with generally accepted accounting principles.

ARTHUR ANDERSEN LLP

Boston, Massachusetts
January 5, 1998

                                                                              23


<PAGE>

Pioneer Short-Term Income Trust
TRUSTEES, OFFICERS AND SERVICE PROVIDERS

   
Trustees                         Officers 
John F. Cogan, Jr.               John F. Cogan, Jr., Chairman and
Mary K. Bush                      President
Richard H. Egdahl, M.D.          David D. Tripple, Executive Vice President
Margaret B.W. Graham             Richard A. Schlanger, Vice President
John W. Kendrick                 William H. Keough, Treasurer
Marguerite A. Piret              Joseph P. Barri, Secretary
David D. Tripple
Stephen K. West
John Winthrop
    

Investment Adviser
Pioneering Management Corporation


Custodian
Brown Brothers Harriman & Co.


Independent Public Accountants
Arthur Andersen LLP


Principal Underwriter
Pioneer Funds Distributor, Inc.


Legal Counsel
Hale and Dorr LLP


Shareowner Services and Transfer Agent
Pioneering Services Corporation

24
<PAGE>

 
RETIREMENT PLANS FROM PIONEER

   
Pioneer offers retirement plans suited to the individual investor and
businesses of all sizes. For information, contact your investment professional,
or call Pioneer at 1-800-622-0176.

Individual Plans
Individual Retirement Account (IRA) The $2,000 maximum annual contribution may
be tax-deductible; earnings are tax-deferred.

Roth IRA New in 1998, $2,000 maximum annual contributions are not tax-
deductible. Earnings are tax-free for qualified withdrawals.

Plans for Small Businesses or the Self-Employed
SIMPLE (Savings Incentive Match PLan for Employees)
IRA or 401(k) Plan For firms with 100 or fewer employees. Employees can make
pre-tax contributions of up to $6,000 annually, and an employer contribution is
required.

Simplified Employee Pension Plan (SEP) Self-employed people and small- business
owners can make tax-deductible contributions of up to 15% of their income.

Employer-Sponsored Plans
401(k) Plan Allows employees to make pre-tax contributions. Also allows for
employer contributions.

403(b) Plan Lets employees of tax-exempt organizations set aside part of their
salary, before taxes, through payroll deduction.

Profit Sharing Plan Employers contribute on a discretionary basis, usually
based on profits.

Age-Weighted Profit Sharing Plan Employer makes discretionary contributions
based on employees' age and salary.

Money Purchase Pension Plan (MPP) Employers contribute based on a fixed
formula.



Most retirement plan withdrawals must meet specific conditions to avoid
                                   penalties.

                                                                              25
    
<PAGE>

 PROGRAMS AND SERVICES FOR PIONEER SHAREOWNERS

Your investment representative can give you additional information on Pioneer's
programs and services. If you want to order literature on any of the following
items directly, simply call Pioneer at 1-800-225-6292.


FactFoneSM
Our automated account information service, available to you 24 hours a day,
seven days a week. FactFone gives you a quick and easy way to check fund share
prices, yields, dividends and distributions, as well as information about your
own account. Simply call 1-800-225-4321. For specific account information, have
your 13-digit account number and four-digit personal identification number at
hand.


90-Day Reinstatement Privilege (for Class A Shares)
Enables you to reinvest all or a portion of the money you redeem from your
Pioneer account - without paying a sales charge - within 90 days of your
redemption. You have the choice of investing in any Pioneer fund, as long as
you meet its minimum investment requirement.


Investomatic Plan
An easy and convenient way for you to invest on a regular basis. All you need
to do is authorize a set amount of money to be moved out of your bank account
into the Pioneer fund of your choice. Investomatic also allows you to change
the dollar amount, frequency and investment date right over the phone. By
putting aside affordable amounts of money regularly, you can build a long-term
investment - without sacrificing your current standard of living.


Payroll Investment Program (PIP)
Lets you invest in a Pioneer fund directly through your paycheck. All that's
involved is for your employer to fill out an authorization form allowing
Pioneer to deduct from participating employees' paychecks. You specify the
dollar amount you want to invest into the Pioneer fund(s) of your choice.


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Automatic Exchange Program
A simple way to move money from a money market or bond fund into a stock fund
over a period of time. Just invest a lump sum in a Pioneer money market fund or
bond fund. Then, select the Pioneer equity fund or funds you wish to invest in,
and choose the amounts and dates for Pioneer to sell shares of your money
market or bond fund and use the proceeds to buy shares of the Pioneer equity
fund you have chosen. Over time, your original investment will be shifted to
your Pioneer equity fund.


Directed Dividends
Lets you invest cash dividends from one Pioneer fund to an account in another
Pioneer fund with no sales charge or fee. Simply fill out the applicable
information on a Pioneer Account Options Form. (This program is available for
dividend payments only; capital gains distributions are not eligible at this
time.)


Direct Deposit
Lets you move money into your bank account using electronic funds transfer
(EFT). EFT moves your money faster than you would receive a check, eliminates
unnecessary paper and mail, and avoids lost checks. Simply fill out a Pioneer
Direct Deposit Form, giving your instructions.


Systematic Withdrawal Plan (SWP)
Lets you establish automatic withdrawals from your account at set intervals.
You decide the frequency and the day of the month you want. Pioneer will send
the proceeds by check to the address you designate, or electronically to your
bank account. You also can authorize Pioneer to make the redemptions payable to
someone else. (SWPs are available only for accounts with a value of $10,000 or
more.)


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                           This page for your notes.

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THE PIONEER FAMILY OF MUTUAL FUNDS

For information about any Pioneer mutual fund, please contact your investment
representative, or call Pioneer at 1-800-225-6292. Ask for a free fund
information kit, which includes a fund prospectus. Please read the prospectus
carefully before you invest or send money.



Growth Funds                          Income Funds
Global/International                  Taxable
Pioneer Emerging Markets Fund         Pioneer America Income Trust
Pioneer Europe Fund                   Pioneer Bond Fund
Pioneer Gold Shares                   Pioneer Short-Term Income Trust*
Pioneer India Fund
Pioneer International Growth Fund     Tax-Exempt
Pioneer World Equity Fund             Pioneer Intermediate Tax-Free Fund
                                      Pioneer Tax-Free Income Fund

United States
Pioneer Capital Growth Fund           Money Market Fund
Pioneer Growth Shares                 Pioneer Cash Reserves Fund
Pioneer Micro-Cap Fund*
Pioneer Mid-Cap Fund
Pioneer Small Company Fund


Growth and Income Funds
Pioneer Balanced Fund
Pioneer Equity-Income Fund
Pioneer Fund
Pioneer Real Estate Shares
Pioneer II









*Offers Class A and B Shares only

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HOW TO CONTACT PIONEER

We are pleased to offer a variety of convenient ways for you to contact us for
assistance or information.


Call us for:

Account information, including existing accounts,
new accounts, prospectuses, applications
and service forms                                               1-800-225-6292


FactFoneSM for automated fund yields, prices,
account information and transactions                            1-800-225-4321


Retirement plans information                                    1-800-622-0176


Telecommunications Device for the Deaf (TDD)                    1-800-225-1997


Write to us at:

Pioneering Services Corporation
60 State Street
Boston, Massachusetts 02109


Our toll-free fax                                               1-800-225-4240


Our Internet e-mail address                               [email protected]
(for general questions about Pioneer only)


Visit our web site:                                       www.pioneerfunds.com




This report must be preceded or accompanied by a current
Fund prospectus.


[Pioneer logo]



   
Pioneer Funds Distributor, Inc.
 60 State Street                      0198-4681
 Boston, Massachusetts 02109         (C) Pioneer Funds Distributor, Inc.
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