PIONEER BALANCED FUND
N-30D, 1998-08-24
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                                                       [Pioneer Logo]




 PIONEER 
 BALANCED 
 FUND




SEMI ANNUAL REPORT 6/30/98




<PAGE>
 
    TABLE OF CONTENTS
 
   -----------------------------------------------------------------------------
 
<TABLE>
      <S>                                                          <C>
      Letter from the Chairman                                      1
      Portfolio Summary                                             2
      Performance Update                                            3
      Portfolio Management Discussion                               6
      Schedule of Investments                                       9
      Financial Statements                                         16
      Notes to Financial Statements                                22
      Report of Independent Public Accountants                     26
      Trustees, Officers and Service Providers                     27
      Retirement Plans from Pioneer                                28
</TABLE>

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     LETTER FROM THE CHAIRMAN 6/30/98
 
     DEAR SHAREOWNER,
 
   -----------------------------------------------------------------------------
     Thank you for this opportunity to introduce the semiannual report for
     Pioneer Balanced Fund, covering the six months ended June 30, 1998. I
     will take a moment to comment on today's investing environment and
     point out a few matters of note concerning your Fund. On behalf of
     your investment team, I thank you for your interest in Pioneer and
     look forward to serving your financial needs in the future.
 
     The bull market in the United States rolled on through the first half
     of 1998. Although the effects of Asia's financial crisis showed more
     frequently in the earnings reports of many U.S. companies, strong
     employment and low inflation kept consumer confidence at record
     highs. Some investors showed concern over Asia's problems and a
     narrowing of the U.S. bull market by moving toward the relative
     safety of U.S. blue chip companies and high-quality bonds,
     particularly Treasurys.
 
     This "flight to quality" reflects a general wariness over the
     historic bull market's continued viability. Your Fund's attempts to
     strike a balance between the growth potential of the U.S. stock
     market and the safety and income features of high-quality domestic
     bonds are in keeping with the economic times. With patience and
     research your Fund will continue to seek growth and income for the
     long term.
 
     I encourage you to read on to learn more about Pioneer Balanced Fund.
     If you have questions, please contact your investment professional,
     or Pioneer at 1-800-225-6292.
 
     Respectfully,
 
     /s/ John F. Gogan, Jr.
     John F. Cogan, Jr.,
     Chairman and President
 
                                                                               1

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     PORTFOLIO SUMMARY 6/30/98
 
     PORTFOLIO DIVERSIFICATION
 
   -----------------------------------------------------------------------------
     (As a percentage of total investment portfolio)

                                  [PIE CHART]

     Convertible Securities 1%
     International Preferred Stocks 1%
     Short-Term Cash Equivalents 5%
     U.S. Common Stocks 55%
     U.S. Corporate Bonds 23%
     U.S. Corporate Securities 15%
         
 
     SECTOR DISTRIBUTION
 
   -----------------------------------------------------------------------------
     (As a percentage of long-term holdings)
 
                                  [PIE CHART]

     Other 11%
     Consumer Staples 4%
     Energy 6%
     Technology 6%
     Consumer Cyclicals 5%
     Financial 20%
     Healthcare 17%
     Government Obligations 15%
     Basic Materials 10%
     Capital Goods 6%


     10 LARGEST HOLDINGS
 
   -----------------------------------------------------------------------------
     (As a percentage of long-term holdings)
 
<TABLE>
      <C>  <S>                             <C>    <C>  <C>                             <C>
       1.  Monsanto Co.                    3.81%   6.  Allstate Corp.                  3.12%
       2.  U.S. Treasury Bond, 6.5%,       3.62    7.  Integrated Health Services,     2.90
           10/15/06                                    Inc.
       3.  U.S. Treasury Notes, 6.25%,     3.48    8.  Merck & Co., Inc.               2.73
           1/31/02
       4.  U.S. Treasury Notes, 5.875%,    3.41    9.  Conseco, Inc.                   2.71
           1/31/99
       5.  Green Tree Financial Corp.      3.35   10.  American Home Products Corp.    2.64
</TABLE>
 
     Fund holdings will vary for other periods.
 
  2

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     PERFORMANCE UPDATE 6/30/98                               CLASS A SHARES
 
    SHARE PRICES AND DISTRIBUTIONS
 
   -----------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
      NET ASSET VALUE
         PER SHARE            6/30/98     12/31/97
<S>                          <C>        <C>            <C>
                             $10.52     $10.15
</TABLE>
 
<TABLE>
<CAPTION>
  DISTRIBUTIONS PER SHARE     INCOME     SHORT-TERM      LONG-TERM
   (12/31/97 - 6/30/98)      DIVIDENDS  CAPITAL GAINS  CAPITAL GAINS
<S>                          <C>        <C>            <C>
                             $0.150           -              -
</TABLE>
 
    INVESTMENT RETURNS
 
   -----------------------------------------------------------------------------
    The mountain chart on the right shows the growth of a $10,000
    investment made in Pioneer Balanced Fund at public offering price,
    compared to the growth of the Standard & Poor's 500 Index and the
    Lehman Brothers Government/Corporate Bond Index.
 
                                    [CHART]
                               Growth of $10,000

<TABLE>
<CAPTION>

                                                                 Lehman Brothers Government/
Pioneer Balanced Fund*        Standard & Poor's 500 Index           Corporate Bond Index
- ----------------------        ---------------------------        ---------------------------
<S>                                <C>                               <C>
           9550                         10,000                             10,000
         10,843                         12,044                             11,234
         11,787                         14,018                             12,032
         12,740                         15,054                             13,262
         14,320                         17,065                             15,141
         16,219                         19,381                             17,132
         16,025                         19,658                             16,881
         17,834                         24,768                             19,036
         19,784                         31,191                             19,927
         22,887                         41,993                             21,471
         25,775                         54,628                             23,894
</TABLE>

                          AVERAGE ANNUAL TOTAL RETURNS
                             (As of June 30, 1998)

<TABLE>
<CAPTION>

     PERIOD               NET ASSET VALUE           PUBLIC OFFERING PRICE*
     ------               ---------------           ---------------------
<S>                        <C>                          <C>
    10 Years                  10.43%                        9.93%
     5 Years                   9.71                         8.71
     1 year                   12.62                         7.60
</TABLE>

* Reflects deduction of the maximum 4.5% sales charge at the beginning of the 
  period and assumes reinvestment of distributions at net asset value.      

    The Fund adopted its current name and investment objective on February
    3, 1997. Prior to that date, the Fund's name was Pioneer Income Fund and
    its objective was income from a portfolio of income-producing bonds and
    stocks.
 
    The Lehman Brothers Government/Corporate Bond Index is an unmanaged,
    composite index of the U.S. bond market. It contains 5,353 issues,
    including Treasury and government agency securities, investment-grade
    corporate bonds and Yankee bonds. The Standard & Poor's (S&P) 500 Index
    is an unmanaged measure of 500 widely held common stocks listed on the
    New York Stock Exchange, American Stock Exchange and the
    Over-the-Counter market. Index returns assume reinvestment of dividends
    and, unlike Fund returns, do not reflect any fees, expenses or sales
    charges. You cannot invest directly in an 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 BALANCED FUND
 
- --------------------------------------------------------------------------------
    PERFORMANCE UPDATE 6/30/98                                CLASS B SHARES
 
    SHARE PRICES AND DISTRIBUTIONS
 
   -----------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
      NET ASSET VALUE
         PER SHARE            6/30/98     12/31/97
<S>                          <C>        <C>            <C>
                             $10.44     $10.08
</TABLE>
 
<TABLE>
<CAPTION>
  DISTRIBUTIONS PER SHARE     INCOME     SHORT-TERM      LONG-TERM
   (12/31/97 - 6/30/98)      DIVIDENDS  CAPITAL GAINS  CAPITAL GAINS
<S>                          <C>        <C>            <C>
                             $0.110     -              -
</TABLE>
 
    INVESTMENT RETURNS
 
   -----------------------------------------------------------------------------
    The mountain chart on the right shows the growth of a $10,000
    investment made in Pioneer Balanced Fund, compared to the growth of the
    Standard & Poor's 500 Index and the Lehman Brothers Government/
    Corporate Bond Index.
 
                                    [CHART]
                               GROWTH OF $10,000
<TABLE>
<CAPTION>
    PIONEER         STANDARD & POOR'S           LEHMAN BROTHERS GOVERNMENT/
  BALANCED FUND*        500 INDEX                 CORPORATE BOND INDEX
    <S>             <C>                        <C>    
     10,000              10,000                   10,000
     10,397              10,654                   10,502
     10,813              11,498                   10,703
     11,374              12,188                   11,202
     11,330              12,841                   10,942
     11,455              13,416                   10,994
     11,672              13,827                   11,188
     12,400              14,979                   11,530
     12,235              15,383                   11,431
     13,142              18,062                   11,846
     14,232              19,413                   12,261
     14,010              19,969                   12,655
     14,871              22,748                   12,847
     14,362              23,497                   13,183
</TABLE>

                          AVERAGE ANNUAL TOTAL RETURNS
                             (As of June 30, 1998)

<TABLE>
<CAPTION>
                         IF                  IF
PERIOD                  HELD              REDEEMED*
<S>                     <C>               <C>
Life-of-Fund             12.79%              12.06%
(4/28/95)
1 Year                   11.57                7.80
</TABLE>

*   Reflects deduction of the maximum applicable contingent deferred sales 
    charge (CDSC) at the end of the period and assumes reinvestment of
    distributions. The maximum CDSC of 4% declines over six years.

    The Fund adopted its current name and investment objective on February
    3, 1997. Prior to that date, the Fund's name was Pioneer Income Fund and
    its objective was income from a portfolio of income-producing bonds and
    stocks.
 
    The Lehman Brothers Government/Corporate Bond Index is an unmanaged,
    composite index of the U.S. bond market. It contains 5,353 issues,
    including Treasury and government agency securities, investment-grade
    corporate bonds and Yankee bonds. The Standard & Poor's (S&P) 500 Index
    is an unmanaged measure of 500 widely held common stocks listed on the
    New York Stock Exchange, American Stock Exchange and the
    Over-the-Counter market. Index returns assume reinvestment of dividends
    and, unlike Fund returns, do not reflect any fees, expenses or sales
    charges. You cannot invest directly in an 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 BALANCED FUND
 
- --------------------------------------------------------------------------------
    PERFORMANCE UPDATE 6/30/98                                CLASS C SHARES
 
    SHARE PRICES AND DISTRIBUTIONS
 
   -----------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
      NET ASSET VALUE
         PER SHARE            6/30/98     12/31/97
<S>                          <C>        <C>            <C>
                             $10.55     $10.17
</TABLE>
 
<TABLE>
<CAPTION>
  DISTRIBUTIONS PER SHARE     INCOME     SHORT-TERM      LONG-TERM
   (12/31/97 - 6/30/98)      DIVIDENDS  CAPITAL GAINS  CAPITAL GAINS
<S>                          <C>        <C>            <C>
                             $0.110     -              -
</TABLE>
 
    INVESTMENT RETURNS
 
   -----------------------------------------------------------------------------
    The mountain chart on the right shows the growth of a $10,000
    investment made in Pioneer Balanced Fund compared to the growth of the
    Standard & Poor's 500 Index and the Lehman Brothers
    Government/Corporate Bond Index.
 

                                    [CHART]
                               GROWTH OF $10,000
<TABLE>
<CAPTION>
       Pioneer       Standard & Poor's         Lehman Brothers Government/
    Balanced Fund*      500 Index                Corporate Bond Index
    <S>             <C>                        <C>    
     10,000              10,000                   10,000
      9,856              10,203                    9,708
      9,974              10,660                    9,753
     10,163              10,987                    9,926
     10,812              11,902                   10,229
     10,678              12,223                   10,141
     11,487              14,352                   10,509
     12,456              15,426                   10,878
     12,269              15,867                   11,227
     13,029              18,076                   11,398
     12,859              18,671                   11,696
</TABLE>

                          AVERAGE ANNUAL TOTAL RETURNS
                             (As of June 30, 1998)

<TABLE>
<CAPTION>
                         IF                  IF
PERIOD                  HELD              REDEEMED*
<S>                     <C>               <C>
Life-of-Fund             11.00%              11.00%
(1/31/96)
1 Year                   11.95               11.95
</TABLE>

*   Assumes reinvestment of distributions. The 1% contingent deferred sales
    charge (CDSC) applies to redemptions made within one year of purchase.
 
    The Fund adopted its current name and investment objective on February
    3, 1997. Prior to that date, the Fund's name was Pioneer Income Fund and
    its objective was income from a portfolio of income-producing bonds and
    stocks.
 
    The Lehman Brothers Government/Corporate Bond Index is an unmanaged,
    composite index of the U.S. bond market. It contains 5,353 issues,
    including Treasury and government agency securities, investment-grade
    corporate bonds and Yankee bonds. The Standard & Poor's (S&P) 500 Index
    is an unmanaged measure of 500 widely held common stocks listed on the
    New York Stock Exchange, American Stock Exchange and the
    Over-the-Counter market. Index returns assume reinvestment of dividends
    and, unlike Fund returns, do not reflect any fees, expenses or sales
    charges. You cannot invest directly in an 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.
                                                                               5

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     PORTFOLIO MANAGEMENT DISCUSSION 6/30/98
 
     Over the past six months, neither the aging bull market in the United
     States nor the bear market in Asia gave any real signs of going away.
     Their dual influence on the worlds of business and finance clouded
     the crystal ball of many would be prognosticators.
 
     U.S. stocks, reflected in the broad-based Standard & Poor's 500
     Index's return of 17.67%, surged ahead, despite a slower second
     quarter that included rumblings from Asia's economic troubles. As the
     period progressed, bonds, especially the high quality Treasurys,
     benefited from nervous investors' "flight to quality" as the signals
     became more mixed on the ability of the bull market to survive.
 
     The following discussion with your Fund's portfolio manager, William
     C. Field, provides a review of the semiannual period, including a
     look at some of the factors that affected investment decisions and
     performance.
 
     Q: HOW DID THE FUND PERFORM IN THE FIRST SIX MONTHS OF THIS YEAR?
     A: On an absolute basis, the Fund has posted solid performance
     numbers. For the six months ended June 30, 1998, Class A Shares
     returned 5.12%, Class B Shares 4.65% and Class C Shares 4.81% at net
     asset value. Unfortunately, we underperformed the 8.95% average
     return for the 409 funds in the Lipper Balanced Funds category.
     (Lipper Analytical Services, Inc. is an independent firm that reports
     mutual fund performance.)
 
     Q: WHAT ARE SOME OF THE FACTORS THAT AFFECTED PERFORMANCE?
     A: Our largest holdings in the Fund did well. Drug manufacturer Merck
     rose 27.14%. Green Tree Financial was up 83.60%, benefiting from its
     acquisition by another of our investments, Conseco. American Home
     Products returned 37.25%.
 
     The Fund's gains from these stocks, however, were dampened by
     holdings in technology, specifically the semiconductor and
     semiconductor-related industries, as well as by investments in real
     estate investment trusts (REITs).
 
     In the semiconductor industry, where lack of demand and too much
     inventory wreaked havoc on business, investments in Applied
     Materials,
 
  6

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
 
     Teradyne, Helix Technologies and Photronics hurt results. This
     normally cyclical business has been down for two years now. That's
     usually its inflection point - when business rebounds - but that
     hasn't happened this time around. The lack of Asian demand has put
     off any improvement, since companies in Asia can't raise capital to
     build new plants and order equipment. These mostly small technology
     companies cost the Fund in relative performance. We had a weighting
     in technology of 14% at the beginning of the period. We've brought
     our weighting down to 6% by the end of the period.
 
     REITs, which traditionally move independently of the general stock
     market, were another problem. With the current demand for these
     stocks so low and our belief that this would not change any time
     soon, we decided to bring down our weighting in REITs significantly.
     As a matter of fact, the only REIT still in the portfolio is
     Mack-Cali Realty.
 
     Q: WERE THERE ANY OTHER SHIFTS IN THE FUND'S INVESTMENT STRATEGY?
     A: We sold small-cap technology stocks and reallocated that money to
     healthcare including pharmaceuticals. We completely sold positions in
     Adaptec, Avnet and Lam Research.
 
     We believe pharmaceuticals will have more consistent growth going
     forward, even though they look a little expensive right now. In terms
     of demographics, they have the wind at their backs. As mentioned
     before, Merck and American Home Products have both done well.
 
     CVS, a new buy this period, is at the forefront of the consolidating
     pharmacy business. By acquiring Revco, it has extended its reach
     south along the East Coast and it has pushed West with Arbour Drug, a
     Michigan based company. CVS now profitably dominates the East Coast
     drug store pharmacy business and is looking for more territories to
     enter.
 
     Q: ANY OTHER SECTORS WORTH MENTIONING?
     A: Financial has been a good area. Insurance companies Allstate and
     Conseco did well for us. Conseco had a huge first quarter, then took
     some charges when it bought Green Tree Financial. Green Tree's
     earnings had been accelerating and Conseco decided to take the
     plunge.
 
                                                                               7

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     PORTFOLIO MANAGEMENT DISCUSSION 6/30/98  (CONTINUED)
 
     There are concerns on the street that Conseco (an insurance company
     vs. consumer finance) wouldn't know how to run Green Tree. We own
     both and believe we understand both of them and the advantages to
     their merger. We're looking for them to take advantage of some cost
     efficiencies and surprise on the upside with earnings. The stock
     sells at 12x earnings - the peer group sells at 18x earnings. So
     there is huge room for improvement.
 
     Q: WHAT ABOUT THE MIX OF STOCKS AND BONDS?
     A: In the middle of the period we were at the high end of the range
     of equity investments - 60% in equities, 38% in bonds and 2% in cash.
     The equity side came down when we sold technology, and at the end of
     the period we were at about 57% equities. That's at the lower end of
     the range now but I think it's prudent with the S&P 500 at all time
     highs.
 
     On the bond side, the only news during the first half of the year was
     that we sold the position in General Motors. We took the proceeds and
     bought five-year Treasurys to bring down the duration. The Fund went
     from an average duration of 5.3 years in the middle of the period
     around March 31 to 4.7 years on June 30 at the end. That's in line
     with the Lehman Brothers Government/Corporate Index. (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.)
 
     Q: HOW DO YOU SEE THE REST OF THE YEAR UNFOLDING?
     A: I hope to see more consistent performance from the Fund. Selling
     small-cap technology stocks should take out a lot of potential
     volatility. We've increased the portfolio's average market
     capitalization - now at $6 billion - by using the money from
     small-caps to add large healthcare/pharmaceutical firms. I am also
     confident that the 10 largest stock holdings are well positioned.
     Between the bond portfolio's shorter duration and the larger average
     market-cap for stocks, I hope to see the Fund's relative performance
     improve as well. Ultimately our goal is to provide our shareowners
     with regular income and performance that lands between the returns of
     the Lehman Government/Corporate Index and the Standard & Poor's 500
     Index.
 
  8

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     SCHEDULE OF INVESTMENTS 6/30/98
 
<TABLE>
<CAPTION>
SHARES                                                             VALUE
<C>        <S>                                                  <C>
           INVESTMENT IN SECURITIES - 94.9%
           PREFERRED STOCKS - 1.7%
117,000    Elf Overseas, Ltd. (Series A)                        $  3,042,000
 38,150    Sprint Corp., 8.25%, 3/31/00 (Convertible)              2,205,547
                                                                ------------
           TOTAL PREFERRED STOCKS
           (Cost $4,273,401)                                    $  5,247,547
                                                                ------------
           COMMON STOCKS - 54.8%
           BASIC MATERIALS - 5.3%
           CHEMICALS - 1.0%
 40,000    E.I. du Pont Nemours and Co.                         $  2,985,000
                                                                ------------
           CHEMICALS (DIVERSIFIED) - 3.6%
200,000    Monsanto Co.                                         $ 11,175,000
                                                                ------------
           GOLD & PRECIOUS METALS MINING - 0.7%
 95,000    Newmont Mining Corp.                                 $  2,244,375
                                                                ------------
           TOTAL BASIC MATERIALS                                $ 16,404,375
                                                                ------------
           CAPITAL GOODS - 1.8%
           AEROSPACE/DEFENSE - 0.4%
 30,000    Boeing Co.                                           $  1,336,875
                                                                ------------
           MACHINERY (DIVERSIFIED) - 0.8%
116,200    AGCO Corp.                                           $  2,389,363
                                                                ------------
           MACHINERY (SPECIALIZED) - 0.6%
 50,000    Sealed Air Corp.*                                    $  1,837,500
                                                                ------------
           TOTAL CAPITAL GOODS                                  $  5,563,738
                                                                ------------
           COMMUNICATION SERVICES - 2.1%
           TELEPHONE - 2.1%
 20,000    Ameritech Corp.                                      $    897,500
 20,000    Bell Atlantic Corp.                                       912,500
 30,000    Bellsouth Corp.                                         2,013,750
 50,000    GTE Corp.                                               2,781,250
                                                                ------------
           TOTAL COMMUNICATION SERVICES                         $  6,605,000
                                                                ------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements.  9

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     SCHEDULE OF INVESTMENTS 6/30/98                              (CONTINUED)
 
<TABLE>
<CAPTION>
SHARES                                                             VALUE
<C>        <S>                                                  <C>
           CONSUMER CYCLICALS - 1.7%
           AUTO PARTS & EQUIPMENT - 0.5%
 20,100    Magna International Inc.                             $  1,379,362
                                                                ------------
           HOMEBUILDING - 0.7%
110,000    Clayton Homes, Inc.                                  $  2,090,000
                                                                ------------
           RETAIL (DEPT. STORES) - 0.2%
 10,000    Penney (J.C.) Co., Inc.                              $    723,125
                                                                ------------
           TEXTILES (APPAREL) - 0.3%
 20,000    Nike, Inc. (Class B)                                 $    973,750
                                                                ------------
           TOTAL CONSUMER CYCLICALS                             $  5,166,237
                                                                ------------
           CONSUMER STAPLES - 3.8%
           FOODS - 0.7%
 10,000    BestFoods                                            $    580,625
 30,000    Heinz (H.J.) Co.                                        1,683,750
                                                                ------------
                                                                $  2,264,375
                                                                ------------
           HOUSEHOLD PRODUCTS (NON-DURABLES) - 2.8%
110,900    First Brands Corp.                                   $  2,841,813
125,000    Kimberly Clark Co.                                      5,734,375
                                                                ------------
                                                                $  8,576,188
                                                                ------------
           RETAIL (DRUG STORES) - 0.3%
 20,000    CVS Corp.                                            $    778,750
                                                                ------------
           TOTAL CONSUMER STAPLES                               $ 11,619,313
                                                                ------------
           ENERGY - 3.0%
           OIL (DOMESTIC INTEGRATED) - 1.3%
 50,000    Atlantic Richfield Co.                               $  3,906,250
                                                                ------------
           OIL (INTERNATIONAL INTEGRATED) - 1.3%
 40,000    Amoco Corp.                                          $  1,665,000
 30,000    Mobil Corp.                                             2,298,750
                                                                ------------
                                                                $  3,963,750
                                                                ------------
           OIL & GAS (DRILLING & EQUIPMENT) - 0.1%
 10,000    EVI, Inc.*                                           $    371,250
                                                                ------------
           OIL & GAS (REFINING & MARKETING) - 0.3%
 25,000    Sun Company, Inc.                                    $    970,313
                                                                ------------
           TOTAL ENERGY                                         $  9,211,563
                                                                ------------
</TABLE>
 
  10
   The accompanying notes are an integral part of these financial statements.

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
SHARES                                                             VALUE
<C>        <S>                                                  <C>
           FINANCIAL - 15.3%
           BANKS (MONEY CENTER) - 1.0%
 40,000    The Chase Manhattan Corp.                            $  3,020,000
                                                                ------------
           CONSUMER FINANCE - 4.8%
230,000    Green Tree Financial Corp.                           $  9,846,875
100,000    SLM Holdings Corp.                                      4,900,000
                                                                ------------
                                                                $ 14,746,875
                                                                ------------
           FINANCIAL (DIVERSIFIED) - 1.3%
 10,000    Federal National Mortgage Association                $    607,500
100,000    Mack-Cali Reality Corp.                                 3,437,500
  7,500    Ocwen Asset Investment Corp.                              124,219
                                                                ------------
                                                                $  4,169,219
                                                                ------------
           INSURANCE (PROPERTY-CASUALTY) - 2.9%
100,000    Allstate Corp.                                       $  9,156,250
                                                                ------------
           INSURANCE (LIFE/HEALTH) - 2.6%
170,000    Conseco, Inc.                                        $  7,947,500
                                                                ------------
           SAVINGS & LOAN - 2.7%
 74,000    Charter One Financial, Inc.                          $  2,492,875
133,500    Washington Mutual, Inc.                                 5,798,906
                                                                ------------
                                                                $  8,291,781
                                                                ------------
           TOTAL FINANCIAL                                      $ 47,331,625
                                                                ------------
           HEALTHCARE - 14.8%
           HEALTHCARE (DIVERSIFIED) - 4.9%
150,000    American Home Products Corp.                         $  7,762,500
 40,000    Bristol-Myers Squibb Co.                                4,597,500
 40,000    Johnson & Johnson                                       2,950,000
                                                                ------------
                                                                $ 15,310,000
                                                                ------------
           HEALTHCARE (DRUGS/MAJOR PHARMACEUTICALS) - 2.5%
 60,000    Merck & Co., Inc.                                    $  8,025,000
                                                                ------------
           HEALTHCARE (HOSPITAL MGT.) - 2.0%
105,000    Quorum Health Group, Inc.*                           $  2,782,500
113,300    Tenet Healthcare Corp.*                                 3,540,625
                                                                ------------
                                                                $  6,323,125
                                                                ------------
           HEALTHCARE (LONG TERM CARE) - 2.8%
226,660    Integrated Health Services, Inc.                     $  8,499,750
                                                                ------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements. 11

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     SCHEDULE OF INVESTMENTS 6/30/98                              (CONTINUED)
 
<TABLE>
<CAPTION>
SHARES                                                             VALUE
<C>        <S>                                                  <C>
           HEALTHCARE (MEDICAL PRODUCTS/SUPPLIES) - 2.5%
132,100    Beckman Instruments, Inc.                            $  7,694,825
                                                                ------------
           TOTAL HEALTHCARE                                     $ 45,852,700
                                                                ------------
           TECHNOLOGY - 6.2%
           ELECTRONICS (SEMICONDUCTORS) - 1.8%
 35,000    Etec Systems, Inc.*                                  $  1,231,562
 60,000    Intel Corp.                                             4,447,500
                                                                ------------
                                                                $  5,679,062
                                                                ------------
           EQUIPMENT (SEMICONDUCTOR) - 3.3%
125,000    Applied Materials, Inc.*                             $  3,687,500
198,900    Helix Technology Corp.                                  2,983,500
 95,800    Photronics, Inc.*                                       2,113,587
 53,000    Teradyne, Inc.*                                         1,417,750
                                                                ------------
                                                                $ 10,202,337
                                                                ------------
           SERVICES (DATA PROCESSING) - 1.1%
100,000    First Data Corp.                                     $  3,331,250
                                                                ------------
           TOTAL TECHNOLOGY                                     $ 19,212,649
                                                                ------------
           UTILITIES - 0.8%
           ELECTRIC COMPANIES - 0.8%
 20,000    Allegheny Power Systems, Inc.                        $    602,500
 50,000    Dominion Resources, Inc.                                2,037,500
                                                                ------------
           TOTAL UTILITIES                                      $  2,640,000
                                                                ------------
           TOTAL COMMON STOCKS
           (Cost $151,803,447)                                  $169,607,200
                                                                ------------
</TABLE>
 
<TABLE>
<CAPTION>
               S&P/MOODY'S
 PRINCIPAL       RATINGS
  AMOUNT       (UNAUDITED)
<C>           <S>              <C>                                      <C>
                               DEBT OBLIGATIONS - 38.4%
                               U.S. CORPORATE BONDS - 23.4%
                               BASIC MATERIALS - 4.5%
$ 2,000,000   BB-/Ba3          Bethlehem Steel Corp., 10.375%, 9/1/03   $   2,150,000
  2,000,000   BBB/Baa2         Bowater, Inc., 9.0%, 8/1/09                  2,348,280
  4,000,000   BBB-/Baa2        Georgia Pacific Co., 9.875%, 11/1/21         4,498,760
  4,000,000   BBB-/Baa2        USX Corp., 9.375%, 2/15/12                   4,924,200
                                                                        -------------
                               TOTAL BASIC MATERIALS                    $  13,921,240
                                                                        -------------
</TABLE>
 
  12
   The accompanying notes are an integral part of these financial statements.

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                S&P/MOODY'S
 PRINCIPAL          RATINGS
  AMOUNT        (UNAUDITED)                                                 VALUE
<C>           <S>              <C>                                      <C>
                               CAPITAL GOODS - 3.7%
$ 5,000,000   AAA/Aaa          General Electric Capital Corp., 8.85%,
                               4/1/05                                   $   5,777,300
  5,000,000   BBB-/Baa3        Southdown, Inc., 10.0%, 3/1/06               5,575,000
                                                                        -------------
                               TOTAL CAPITAL GOODS                      $  11,352,300
                                                                        -------------
                               CONSUMER CYCLICALS - 3.1%
  2,000,000   A/A2             General Motors Acceptance Corp., 8.5%,
                               1/1/03                                   $   2,179,440
  1,500,000   A/A2             May Department Stores Co., 9.875%,
                               6/15/00                                      1,603,275
  5,000,000   BBB-/Baa3        News America Holdings, Inc., 8.25%,
                               8/10/18                                      5,667,350
                                                                        -------------
                               TOTAL CONSUMER CYCLICALS                 $   9,450,065
                                                                        -------------
                               CONSUMER STAPLES - 0.7%
  2,000,000   BB-/B1           Viacom International, Inc., 10.25%,
                               9/15/01                                  $   2,215,000
                                                                        -------------
                               TOTAL CONSUMER STAPLES                   $   2,215,000
                                                                        -------------
                               ENERGY - 2.4%
  2,500,000   BBB/Baa2         Ashland Oil Co., 8.8%, 11/15/12          $   2,994,175
  4,100,000   A-/A3            Phillips Petroleum Co., 8.86%, 5/15/22       4,520,373
                                                                        -------------
                               TOTAL ENERGY                             $   7,514,548
                                                                        -------------
                               FINANCIAL - 4.3%
  4,000,000   A/A1             Ford Motor Credit Co., 9.14%, 12/30/14   $   4,641,000
  5,000,000   BB-/Ba1          Riggs National Corp., 8.5%, 2/1/06           5,301,700
  3,000,000   BBB+/A3          Washington Mutual, Inc., 8.375%, 6/1/27      3,330,390
                                                                        -------------
                               TOTAL FINANCIAL                          $  13,273,090
                                                                        -------------
                               HEALTHCARE - 1.7%
  5,000,000   BB-/Ba3          Quorum Health Group, 8.75%, 11/1/05      $   5,175,000
                                                                        -------------
                               TOTAL HEALTHCARE                         $   5,175,000
                                                                        -------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements. 13

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     SCHEDULE OF INVESTMENTS 6/30/98                              (CONTINUED)
 
<TABLE>
<CAPTION>
                S&P/MOODY'S
 PRINCIPAL          RATINGS
  AMOUNT        (UNAUDITED)                                                 VALUE
<C>           <S>              <C>                                      <C>
                               TRANSPORTATION - 3.0%
$ 5,000,000   BBB/Baa1         Delta Air Lines, Inc., 9.2%, 9/23/14     $   6,113,800
  3,000,000   BBB-/Baa2        Kansas City Southern Industries, Inc.,
                               8.8%, 7/1/22                                 3,300,720
                                                                        -------------
                               TOTAL TRANSPORTATION                     $   9,414,520
                                                                        -------------
                               TOTAL CORPORATE BONDS                    $  72,315,763
                                                                        -------------
                               U.S. GOVERNMENT OBLIGATIONS - 15.0%
  4,000,000                    U.S. Treasury Bond, 5.625%, 12/31/02     $   4,016,680
  5,000,000                    U.S. Treasury Bond, 5.375%, 6/30/03          4,975,391
 10,000,000                    U.S. Treasury Bond, 6.5%, 10/15/06          10,619,700
 10,000,000                    U.S. Treasury Notes, 5.875%, 1/31/99        10,023,100
 10,000,000                    U.S. Treasury Notes, 6.25%, 1/31/02         10,223,200
  6,500,000                    U.S. Treasury Notes, 5.75%, 4/30/03          6,562,270
                                                                        -------------
                               TOTAL U.S. GOVERNMENT OBLIGATIONS        $  46,420,341
                                                                        -------------
                               TOTAL DEBT OBLIGATIONS
                               (Cost $114,630,484)                      $ 118,736,104
                                                                        -------------
                               TOTAL INVESTMENT IN SECURITIES
                               (Cost $270,707,332)                      $ 293,590,851
                                                                        -------------
</TABLE>
 
  14
   The accompanying notes are an integral part of these financial statements.

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
 PRINCIPAL
  AMOUNT                                                            VALUE
<C>            <S>                                               <C>
               TEMPORARY CASH INVESTMENT - 5.1%
               REPURCHASE AGREEMENT - 5.1%
$15,700,000    The Chase Manhattan Corp., 5.50%, 7/1/98,
               repurchase price of $15,700,000 plus accrued
               interest on 7/1/98, collateralized by
               $15,818,000 U.S. Treasury Notes, 5.507%,
               3/31/00.                                          $15,700,000
                                                                 -----------
               TOTAL TEMPORARY CASH INVESTMENT
               (Cost $15,700,000)                                $15,700,000
                                                                 -----------
               TOTAL INVESTMENT IN SECURITIES AND TEMPORARY
               CASH INVESTMENT - 100%
               (Cost $286,407,332) (a)                           $309,290,851
                                                                 -----------
</TABLE>
 
*  Non-income producing security.
 
(a) At June 30, 1998, the net unrealized gain on investments based on cost for
federal income tax purposes of $286,407,332 was as follows:
 
<TABLE>
<S>                                                           <C>
    Aggregate gross unrealized gain for all investments in
    which there is an excess of value over tax cost           $ 31,682,899
    Aggregate gross unrealized loss for all investments in
    which there is an excess of tax cost over value             (8,799,380)
                                                              ------------
    Net unrealized gain                                       $ 22,883,519
                                                              ------------
</TABLE>
 
Purchases and sales of securities (excluding temporary cash investments) for the
six months ended June 30, 1998 were as follows:
 
<TABLE>
<CAPTION>
                                                            PURCHASES        SALES
                                                           -----------    -----------
<S>                                                        <C>            <C>
Long-term U.S. Government                                  $19,519,219    $ 3,953,061
Other Long-term Securities                                  73,528,841     83,628,130
</TABLE>
 
   The accompanying notes are an integral part of these financial statements. 15

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     BALANCE SHEET 6/30/98
 
<TABLE>
  <S>                                                             <C>
  ASSETS:
     Investment in securities, at value (including temporary
        cash investment of $15,700,000) (cost $286,407,332)       $309,290,851
     Cash                                                               65,334
     Receivables -
        Investment securities sold                                   4,359,554
        Fund shares sold                                               545,860
        Dividends and interest                                       2,464,077
                                                                  ------------
           Total assets                                           $316,725,676
                                                                  ------------
  LIABILITIES:
     Payables -
        Investment securities purchased                           $  6,633,359
        Fund shares repurchased                                        212,977
     Due to affiliates                                                 454,326
     Accrued expenses                                                   67,346
                                                                  ------------
           Total liabilities                                      $  7,368,008
                                                                  ------------
  NET ASSETS:
     Paid-in capital                                              $277,511,789
     Accumulated undistributed net investment income                   104,686
     Accumulated undistributed net realized gain on investments      8,857,674
     Net unrealized gain on investments                             22,883,519
                                                                  ------------
           Total net assets                                       $309,357,668
                                                                  ------------
  NET ASSET VALUE PER SHARE:
  (Unlimited number of shares authorized)
     Class A (based on $285,473,490/27,132,493 shares)            $      10.52
                                                                  ------------
     Class B (based on $20,121,194/1,927,351 shares)              $      10.44
                                                                  ------------
     Class C (based on $3,762,984/356,641 shares)                 $      10.55
                                                                  ------------
  MAXIMUM OFFERING PRICE:
     Class A                                                      $      11.02
                                                                  ------------
</TABLE>
 
  16
   The accompanying notes are an integral part of these financial statements.

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     STATEMENT OF OPERATIONS
     
     FOR THE SIX MONTHS ENDED 6/30/98
 
<TABLE>
 <S>                                                         <C>              <C>
 INVESTMENT INCOME:
    Dividends (net of foreign taxes withheld of $3,437)      $1,609,382
    Interest                                                  4,475,084
                                                             ----------
          Total investment income                                             $  6,084,466
                                                                              ------------
 EXPENSES:
    Management fees                                          $  985,757
    Transfer agent fees
       Class A                                                  238,668
       Class B                                                   17,903
       Class C                                                    2,797
    Distribution fees
       Class A                                                  354,553
       Class B                                                   84,871
       Class C                                                   13,469
    Accounting                                                   34,679
    Custodian fees                                               33,527
    Registration fees                                            36,200
    Professional fees                                            22,064
    Printing                                                     14,289
    Fees and expenses of nonaffiliated trustees                   7,762
    Miscellaneous                                                15,429
                                                             ----------
          Total expenses                                                      $  1,861,968
          Less fees paid indirectly                                                 (3,045)
                                                                              ------------
          Net expenses                                                        $  1,858,923
                                                                              ------------
             Net investment income                                            $  4,225,543
                                                                              ------------
 REALIZED AND UNREALIZED GAIN ON INVESTMENTS:
    Net realized gain on investments                                          $  2,371,538
    Change in net unrealized gain on investments                                 8,335,642
                                                                              ------------
       Net gain on investments                                                $ 10,707,180
                                                                              ------------
       Net increase in net assets resulting from operations                   $ 14,932,723
                                                                              ------------
</TABLE>
 
   The accompanying notes are an integral part of these financial statements. 17

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     STATEMENTS OF CHANGES IN NET ASSETS
     
     FOR THE SIX MONTHS ENDED 6/30/98 AND THE YEAR ENDED 12/31/97
 
<TABLE>
<CAPTION>
                                                               SIX MONTHS
                                                                 ENDED        YEAR ENDED
                      FROM OPERATIONS:                          6/30/98        12/31/97
 <S>                                                          <C>            <C>
 Net investment income                                        $  4,225,543   $ 10,205,513
 Net realized gain on investments                                2,371,538     42,840,367
 Change in net unrealized gain on investments                    8,335,642    (15,644,829)
                                                              ------------   ------------
       Net increase in net assets resulting from operations   $ 14,932,723   $ 37,401,051
                                                              ------------   ------------
 DISTRIBUTIONS TO SHAREHOLDERS:
 Net investment income:
       Class A ($0.15 and $0.40 per share, respectively)      $ (4,179,851)  $ (9,787,194)
       Class B ($0.11 and $0.31 per share, respectively)          (193,309)      (296,419)
       Class C ($0.11 and $0.31 per share, respectively)           (32,252)       (41,660)
 Net realized gain:
       Class A ($0.00 and $1.54 per share, respectively)                 -    (36,413,655)
       Class B ($0.00 and $1.54 per share, respectively)                 -     (1,818,106)
       Class C ($0.00 and $1.54 per share, respectively)                 -       (245,120)
                                                              ------------   ------------
             Total distributions to shareholders              $ (4,405,412)  $(48,602,154)
                                                              ------------   ------------
 FROM FUND SHARE TRANSACTIONS:
 Net proceeds from sale of shares                             $ 33,224,177   $ 35,307,081
 Reinvestment of distributions                                   3,826,900     43,110,353
 Cost of shares repurchased                                    (28,604,574)   (60,895,690)
                                                              ------------   ------------
       Net increase in net assets resulting from fund share
          transactions                                        $  8,446,503   $ 17,521,744
                                                              ------------   ------------
       Net increase in net assets                             $ 18,973,814   $  6,320,641
 NET ASSETS:
 Beginning of period                                           290,383,854    284,063,213
                                                              ------------   ------------
 End of period (including accumulated undistributed net
   investment income of $104,686 and $284,555, respectively)  $309,357,668   $290,383,854
                                                              ------------   ------------
</TABLE>
 
<TABLE>
<CAPTION>
              CLASS A                 '98 SHARES    '98 AMOUNT    '97 SHARES    '97 AMOUNT
<S>                                 <C>          <C>            <C>          <C>
 Shares sold                          2,267,495    $ 23,891,374   2,323,054    $ 25,981,813
 Reinvestment of distributions          341,583       3,625,144   4,015,098      40,935,530
 Less shares repurchased             (2,527,722)    (26,735,369) (5,215,265)    (58,241,422)
                                      ----------   ------------   ----------   ------------
         Net increase                    81,356    $    781,149   1,122,887    $  8,675,921
                                      ----------   ------------   ----------   ------------
 CLASS B
 Shares sold                            678,669    $  7,107,358     690,179    $  7,841,955
 Reinvestment of distributions           16,589         174,554     192,597       1,938,506
 Less shares repurchased               (135,671)     (1,410,011)   (170,315)     (1,906,474)
                                      ----------   ------------   ----------   ------------
         Net increase                   559,587    $  5,871,901     712,461    $  7,873,987
                                      ----------   ------------   ----------   ------------
 CLASS C
 Shares sold                            210,059    $  2,225,445     129,250    $  1,483,313
 Reinvestment of distributions            2,560          27,202      23,280         236,317
 Less shares repurchased                (42,833)       (459,194)    (65,385)       (747,794)
                                      ----------   ------------   ----------   ------------
         Net increase                   169,786    $  1,793,453      87,145    $    971,836
                                      ----------   ------------   ----------   ------------
</TABLE>
 
  18
   The accompanying notes are an integral part of these financial statements.

<PAGE>
 
PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS 6/30/98
 
<TABLE>
<CAPTION>
                                                SIX MONTHS
                                                  ENDED        YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED
                   CLASS A                       6/30/98        12/31/97     12/31/96     12/31/95     12/31/94    12/31/93(a)
<S>                                             <C>            <C>          <C>          <C>          <C>          <C>
Net asset value, beginning of period             $  10.15       $  10.65     $  10.30     $   9.11     $  10.21     $  10.13
                                                ----------     ----------   ----------   ----------   ----------   -----------
Increase (decrease) from investment
  operations:
  Net investment income                          $   0.14       $   0.41     $   0.64     $   0.66     $   0.66     $   0.65
  Net realized and unrealized gain (loss) on
    investments                                      0.38           1.03         0.33         1.29        (1.09)        0.37
                                                ----------     ----------   ----------   ----------   ----------   -----------
    Net increase (decrease) from investment
      operations                                 $   0.52       $   1.44     $   0.97     $   1.95     $  (0.43)    $   1.02
Distributions to shareholders:
  Net investment income                             (0.15)         (0.40)       (0.62)       (0.65)       (0.67)       (0.64)
  Net realized gain                                     -          (1.54)           -        (0.11)           -        (0.30)
                                                ----------     ----------   ----------   ----------   ----------   -----------
Net increase (decrease) in net asset value       $   0.37       $  (0.50)    $   0.35     $   1.19     $  (1.10)    $   0.08
                                                ----------     ----------   ----------   ----------   ----------   -----------
Net asset value, end of period                   $  10.52       $  10.15     $  10.65     $  10.30     $   9.11     $  10.21
                                                ----------     ----------   ----------   ----------   ----------   -----------
Total return*                                        5.12%         13.92%        9.89%       22.00%       (4.31)%      10.24%
Ratio of net expenses to average net assets          1.18%**+       1.19%+       1.10%+       1.13%+       1.11%        1.06%
Ratio of net investment income to average net
  assets                                             2.83%**+       3.55%+       6.17%+       6.58%+       7.07%        6.52%
Portfolio turnover rate                                61%**         122%          31%          25%          50%          69%
Net assets, end of period (in thousands)         $285,473       $274,695     $276,064     $281,639     $259,970     $296,699
Ratios assuming reduction for fees paid
  indirectly:
  Net expenses                                       1.17%**        1.17%        1.08%        1.11%           -            -
  Net investment income                              2.84%**        3.57%        6.19%        6.60%           -            -
</TABLE>
 
<TABLE>
<C>  <S>
(a)  Prior to the assumption of the management agreement on
     December 1, 1993 by Pioneering Management Corporation, the
     Fund was advised by Mutual of Omaha Fund Management Company.
 *   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.
 +   Ratios assuming no reduction for fees paid indirectly.
</TABLE>
 
   The accompanying notes are an integral part of these financial statements. 19

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     FINANCIAL HIGHLIGHTS 6/30/98
 
<TABLE>
<CAPTION>
                                      SIX MONTHS
                                        ENDED      YEAR ENDED   YEAR ENDED   4/28/95 TO
               CLASS B                 6/30/98      12/31/97     12/31/96     12/31/95
 <S>                                  <C>          <C>          <C>          <C>
 Net asset value, beginning of
  period                               $ 10.08      $ 10.59       $10.27       $ 9.55
                                      ---------    ---------    --------     --------
 Increase from investment
   operations:
   Net investment income               $  0.12      $  0.32       $ 0.52       $ 0.39
   Net realized and unrealized gain
     on investments                       0.35         1.02         0.37         0.90
                                      ---------    ---------    --------     --------
     Net increase from investment
       operations                      $  0.47      $  1.34       $ 0.89       $ 1.29
 Distributions to shareholders:
   Net investment income                 (0.11)       (0.31)       (0.52)       (0.46)
   In excess of net investment
     income                                  -            -        (0.05)           -
   Net realized gain                         -        (1.54)           -        (0.11)
                                      ---------    ---------    --------     --------
 Net increase (decrease) in net
   asset value                         $  0.36      $ (0.51)      $ 0.32       $ 0.72
                                      ---------    ---------    --------     --------
 Net asset value, end of period        $ 10.44      $ 10.08       $10.59       $10.27
                                      ---------    ---------    --------     --------
 Total return*                            4.65%       12.98%        9.02%       13.74%
 Ratio of net expenses to average
   net assets                             1.97%**+     2.01%+       1.88%+       1.88%**+
 Ratio of net investment income to
   average net assets                     2.05%**+     2.65%+       5.45%+       5.83%**+
 Portfolio turnover rate                    61%**       122%          31%          25%
 Net assets, end of period (in
   thousands)                          $20,121      $13,789       $6,940       $1,800
 Ratios assuming reduction for fees
   paid indirectly:
   Net expenses                           1.97%**      1.99%        1.86%        1.78%**
   Net investment income                  2.05%**      2.67%        5.47%        5.93%**
</TABLE>
 
<TABLE>
 <S>  <C>
 *    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.
</TABLE>
 
  20
   The accompanying notes are an integral part of these financial statements.

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     FINANCIAL HIGHLIGHTS 6/30/98
 
<TABLE>
<CAPTION>
                                              SIX MONTHS
                                                ENDED       YEAR ENDED    1/31/96 TO
                  CLASS C                      6/30/98       12/31/97      12/31/96
<S>                                           <C>           <C>           <C>
Net asset value, beginning of period            $10.17        $10.62        $10.39
                                              --------      --------      --------
Increase from investment operations:
  Net investment income                         $ 0.13        $ 0.33        $ 0.49
 Net realized and unrealized
   gain on investments                            0.36          1.07          0.31
                                              --------      --------      --------
   Net increase from investment operations      $ 0.49        $ 1.40        $ 0.80
Distributions to shareholders:
  Net investment income                          (0.11)        (0.31)        (0.49)
 In excess of net investment income                  -             -         (0.08)
 Net realized gain                                   -         (1.54)            -
                                              --------      --------      --------
Net increase (decrease) in net asset value      $ 0.38        $(0.45)       $ 0.23
                                              --------      --------      --------
Net asset value, end of period                  $10.55        $10.17        $10.62
                                              --------      --------      --------
Total return*                                     4.81%        13.48%         8.12%
Ratio of net expenses to average net assets       1.96%**+      2.03%+        1.76%**+
Ratio of net investment income to average
 net assets                                       2.06%**+      2.68%+        5.63%**+
Portfolio turnover rate                             61%**        122%           31%
Net assets, end of period (in thousands)        $3,763        $1,900        $1,059
Ratios assuming reduction for fees paid
 indirectly:
  Net expenses                                    1.96%**       1.98%         1.73%**
 Net investment income                            2.06%**       2.73%         5.66%**
</TABLE>
 
<TABLE>
 <S>  <C>
 *    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.
</TABLE>
 
   The accompanying notes are an integral part of these financial statements. 21

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     NOTES TO FINANCIAL STATEMENTS 6/30/98
 
    1. ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES
 
    Pioneer Balanced Fund (the Fund) is a Delaware business trust
    registered under the Investment Company Act of 1940 as a diversified,
    open-end management investment company. The investment objective of the
    Fund is to seek current income and long-term growth of capital.
 
    The Fund offers three classes of shares -- Class A, Class B and Class C
    shares. Shares of Class A, Class B and Class C each represent an
    interest in the same portfolio of investments of the Fund 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 has exclusive voting rights with respect to the
    distribution plans that have been adopted by Class A, Class B and Class
    C shareholders, respectively.
 
    The Fund's financial statements have been prepared in conformity with
    generally accepted accounting principles that require the management of
    the Fund 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 Fund, which are in conformity
    with those generally accepted in the investment company industry:
 
    A. SECURITY VALUATION
 
       Security transactions are recorded on trade date. Debt securities are
       valued at prices supplied by independent pricing services, which
       consider such factors as Treasury spreads, yields, maturities and
       ratings, and valuations may be supplemented by dealers and other
       sources, as required. Equity securities are valued at the last sale
       price on the principal exchange where they are traded. Securities
       that have not traded on the date of valuation, or securities for
       which sale prices are not generally reported, are valued at the mean
       between the last bid and asked prices. Securities for which market
       quotations are not readily available are valued at their fair values
       as determined by, or under the direction of, the Board of Trustees.
       Dividend income is recorded on the ex-dividend date and interest
       income is recorded on the accrual basis. Temporary cash investments
       are valued at amortized cost.
 
  22

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
 
       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 Fund's practice to first 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 INCOME TAXES
 
       It is the Fund'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 Fund'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.
 
    C. FUND SHARES
 
       The Fund 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 Fund and an indirect subsidiary of The Pioneer Group, Inc.
       (PGI). PFD earned $49,356 in underwriting commissions on the sale of
       fund shares during the six months ended June 30, 1998.
 
    D. CLASS ALLOCATIONS
 
       Distribution fees are calculated based on the average daily net asset
       value attributable to Class A, Class B and Class C shares of the
       Fund, 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 Fund
       level and allocated daily to each class of shares based on the
       respective percentage of adjusted net assets at the beginning of the
       day.
 
                                                                              23

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     NOTES TO FINANCIAL STATEMENTS 6/30/98                       (CONTINUED)
 
       Distributions to shareholders are recorded as of the ex-dividend date.
       Distributions paid by the Fund 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, Class B and Class C shares can bear
       different transfer agent and distribution fees.
 
    2. MANAGEMENT AGREEMENT
 
    Pioneering Management Corporation (PMC), the Fund's investment adviser,
    manages the Fund's portfolio and is a wholly owned subsidiary of PGI.
    Management fees are calculated daily at the annual rate of 0.65% of the
    Fund's average daily net assets up to $1 billion; 0.60% of the next $4
    billion; and 0.55% of the excess over $5 billion.
 
    In addition, under the management agreement, certain other services and
    costs, including accounting, regulatory reporting and insurance
    premiums, are paid by the Fund. At June 30, 1998, $183,394 was payable
    to PMC related to management fees and certain other services.
 
    3. TRANSFER AGENT
 
    PSC, a wholly owned subsidiary of PGI, provides substantially all
    transfer agent and shareholder services to the Fund at negotiated
    rates. Included in due to affiliates is $70,969 in transfer agent fees
    payable to PSC at June 30, 1998.
 
    4. DISTRIBUTION PLANS
 
    The Fund adopted a Plan of Distribution for each class of shares (Class
    A Plan, Class B Plan and Class C Plan) in accordance with Rule 12b-1 of
    the Investment Company Act of 1940. Pursuant to the Class A Plan, the
    Fund pays PFD a service fee of up to 0.25% of the Fund'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 and the Class C Plan, the Fund pays PFD
    1.00% of the average daily net assets attributable to each class of
    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 and Class C shares. Included in due to affiliates is $199,963
    in distribution fees payable to PFD at June 30, 1998.
 
  24

<PAGE>
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
 
    In addition, redemptions of each class of shares may be subject to a
    contingent deferred sales charge (CDSC). A CDSC of 1.00% 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
    six years of purchase are subject to a CDSC at declining rates
    beginning at 4.0%, based on the lower of cost or market value of shares
    being redeemed. Redemptions of Class C shares within one year of
    purchase are subject to a CDSC of 1.00%. Proceeds from the CDSCs are
    paid to PFD. For the six months ended June 30, 1998, CDSCs in the
    amount of $10,834 were paid to PFD.
 
    5. EXPENSE OFFSETS
 
    The Fund has entered into certain expense offset arrangements resulting
    in a reduction in the Fund's total expenses. For the six months ended
    June 30, 1998, the Fund's expenses were reduced by $3,045 under such
    arrangements.
 
    6. LINE OF CREDIT FACILITY
 
    Effective April 14, 1998, the Fund, along with certain others in the
    Pioneer Family of Funds (the "Funds"), collectively participate in a
    $50 million committed, unsecured revolving line of credit facility.
    Borrowings are used solely for temporary or emergency purposes. The
    Fund may borrow up to the lesser of $50 million or the limits set by
    its prospectus for borrowings. Interest on collective borrowings of up
    to $25 million is payable at the Federal Funds Rate plus  3/8% on an
    annualized basis, or at the Federal Funds Rate plus  1/2% if the
    borrowings exceed $25 million at any one time. The Funds pay an annual
    commitment fee for this facility. The commitment fee is allocated among
    such Funds based on their respective borrowing limits. For the six
    months ended June 30, 1998, the Fund had no borrowings under this
    agreement.
 
                                                                              25

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
    TO THE SHAREHOLDERS AND THE BOARD OF TRUSTEES OF
    PIONEER BALANCED FUND:
 
    We have audited the accompanying balance sheet of Pioneer Balanced
    Fund, including the schedule of investments, as of June 30, 1998, and
    the related statement of operations and the statements of changes in
    net assets for the periods presented and the financial highlights for
    the six months ended June 30, 1998 and for each of the four years
    ended December 31, 1997. These financial statements and financial
    highlights are the responsibility of the Fund's management. Our
    responsibility is to express an opinion on these financial statements
    and financial highlights based on our audits. The financial highlights
    for the year ended December 31, 1993 were audited by other auditors
    whose report dated February 22, 1994 expressed an unqualified opinion.
 
    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 June 30, 1998, 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 Balanced Fund as of June 30, 1998, the
    results of its operations and the changes in its net assets for the
    periods presented, and the financial highlights for the six months
    ended June 30, 1998 and for each of the four years ended December 31,
    1997, in conformity with generally accepted accounting principles.
 
    ARTHUR ANDERSEN LLP
 
    Boston, Massachusetts
    August 7, 1998
 
  26

<PAGE>
 
     PIONEER BALANCED FUND
 
- --------------------------------------------------------------------------------
     TRUSTEES, OFFICERS AND SERVICE PROVIDERS
 
<TABLE>
      <S>                                <C>
      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
      Margaret B.W. Graham               President
      John W. Kendrick                   William C. Field, Vice President
      Marguerite A. Piret                William H. Keough, Treasurer
      David D. Tripple                   Joseph P. Barri, Secretary
      Stephen K. West
      John Winthrop
</TABLE>
 
     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
 
                                                                              27

<PAGE>
 
- --------------------------------------------------------------------------------
     RETIREMENT PLANS FROM PIONEER
 
     Pioneer has a long history of helping people work toward their
     retirement goals, offering plans suited to the individual investor
     and businesses of all sizes. For more information on Pioneer
     retirement plans, contact your investment professional, or call
     Pioneer at 1-800-622-0176.
 
     INDIVIDUAL RETIREMENT ACCOUNT (IRA)
     An IRA is a tax-favored account that allows anyone under age 70 1/2
     with earned income to contribute up to $2,000 annually. Spouses may
     contribute up to $2,000 annually into a separate IRA, for a total of
     $4,000 per year for a married couple. Earnings are tax-deferred, and
     contributions may be tax-deductible.
 
     ROTH IRA
     The Roth IRA came about as part of the Taxpayer Relief Act of 1997
     and is available to investors in 1998. Contributions, up to $2,000 a
     year, are not tax-deductible, but earnings are tax-free for qualified
     withdrawals.
 
     401(k) PLAN
     The traditional 401(k) plan allows employees to make pre-tax
     contributions through payroll deduction, up to $9,500 per year or 25%
     of pay, whichever is less. Employers may contribute.
 
     SIMPLE (SAVINGS INCENTIVE MATCH PLAN FOR EMPLOYEES)
     401(k) OR IRA PLAN
     Businesses with 100 or fewer eligible employees can establish either
     plan; both resemble the traditional 401(k), but with less testing and
     lower administration costs. Employees can make pre-tax contributions
     of up to $6,000 per year, and an employer contribution is required.
 
     403(b) PLAN
     Also known as a Tax-Sheltered Account (TSA), a 403(b) plan is
     available only to employees of public schools, not-for-profit
     hospitals and other tax-exempt organizations. A 403(b) plan lets
     employees set aside a portion of their salary, before taxes, through
     payroll deduction.
 
       Most retirement plan withdrawals must meet specific conditions to
                               avoid penalties.
  28

<PAGE>
 
- --------------------------------------------------------------------------------
 
     SIMPLIFIED EMPLOYEE PENSION PLAN (SEP)
     SEPs let self-employed people and small-business owners make tax-
     deductible contributions of up to 15% of their income. Generally,
     employers must contribute the same percentage of pay for themselves
     and any eligible employees; contributions are made directly to
     employees' IRAs. SEPs are easy to administer and can be an especially
     good choice for firms with few or no employees.
 
     PROFIT SHARING PLAN
     Profit sharing plans offer companies considerable flexibility,
     allowing them to decide each year whether a contribution will be made
     and how much, up to 15% of each participant's pay. These plans can
     include provisions for loans and vesting schedules.
 
     AGE-WEIGHTED PROFIT SHARING PLAN
     Like traditional profit sharing plans, employer contributions are
     flexible, but age-weighted plans allocate contributions based on both
     age and salary. Age-weighted plans are designed for employers who
     want to maximize their own contributions while keeping contributions
     to employees affordable.
 
     MONEY PURCHASE PENSION PLAN (MPP)
     Money purchase plans are similar to profit-sharing plans, but allow
     for higher annual contributions -- up to 25% of pay. MPPs aren't as
     flexible as profit sharing plans; a fixed percentage of pay must be
     contributed each year, determined when the plan is established.
     Businesses often set up both MPPs and profit sharing plans.
 
       Most retirement plan withdrawals must meet specific conditions to
                               avoid penalties.
                                                                              29

<PAGE>
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

FACTFONE(SM) 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:
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 WEBSITE:       WWW.PIONEERFUNDS.COM

THIS REPORT MUST BE PRECEDED OR ACCOMPANIED BY A CURRENT FUND PROSPECTUS.

[PIONEER LOGO]  PIONEER FUNDS DISTRIBUTOR, INC.
                60 STATE STREET
                BOSTON, MASSACHUSETTS 02109
                WWW.PIONEERFUNDS.COM

0898-5427
(c)Pioneer Funds Distributor, Inc.
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