PUTNAM HIGH YIELD MUNICIPAL TRUST
N-30D, 1994-11-29
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<PAGE>   1
                                        PUTNAM
                                        HIGH YIELD
                                        MUNICIPAL
                                        TRUST









SEMIANNUAL REPORT
September 30, 1994


                                     [LOGO]
                            BOSTON - LONDON - TOKYO
<PAGE>   2

PERFORMANCE HIGHLIGHTS



  -  As of September 30, 1994, the fund has maintained its
     Morningstar rating of four stars out of a possible five.*

  -  "The long-term case for buying munis and muni funds is
     becoming stronger. Even as tax shelters have fallen by the
     wayside, federal tax rates have climbed."
     -- Barron's, October 10, 1994

  -  Performance should always be considered in light of a fund's
     investment strategy. Putnam High Yield Municipal Trust is
     designed for investors seeking high current income free from
     federal income tax through higher-yielding, lower-rated
     municipal securities.


<TABLE>
<CAPTION>
     ---------------------------------------------------------------------------
     SEMIANNUAL RESULTS AT A GLANCE
     ---------------------------------------------------------------------------
     TOTAL RETURN:                                      NAV         MARKET PRICE
     ---------------------------------------------------------------------------
     <S>                                                <C>          <C>
     6 months ended 9/30/94
     (change in value during period
     plus reinvested distributions)                      0.93%          6.90%
     SHARE VALUE:                                       NAV         MARKET PRICE
     ---------------------------------------------------------------------------
     3/31/94                                            $9.23          $9.25
     9/30/94                                             8.95           9.50
</TABLE>
<TABLE>
                                                   CAPITAL GAINS1
                                                   LONG-    SHORT-
     DISTRIBUTIONS:                  NO.  INCOME   TERM     TERM      TOTAL
     ---------------------------------------------------------------------------
     <S>                             <C>   <C>     <C>      <C>      <C>
     Common shares                   6     $0.375  $0.00    $0.00     $0.375
     ---------------------------------------------------------------------------
                                   SERIES INCOME                      TOTAL
     Preferred shares                A    $738.75      -        -    $738.75
     ---------------------------------------------------------------------------
     CURRENT RETURN:                                    NAV         MARKET PRICE
     End of period
     Current dividend rate2                             8.38%           7.89%
     Taxable equivalent3                               13.87           13.06
<FN>

     Performance data represent past results. For performance over longer 
     periods, see page 8. 1Capital gains are taxable for federal and, in 
     most cases, state tax purposes.  For some investors, investment    
     income may also be subject to the federal Alternative Minimum Tax.
     Investment income may be subject to state and local taxes. 2Income 
     portion of most recent distribution, annualized and divided by NAV or
     market price at end of period. 3Assumes maximum 39.6% federal tax rate.
     Results for investors subject to lower tax rates would not be as
     advantageous.

   * Morningstar is an independent research firm that rates funds relative 
     to funds with similar objectives, based on risk-adjusted medium- and
     long-term performance, as applicable, and adjusted for sales charges.
     A four-star rating puts the fund in the top 32.5% of rated funds.
     Ratings are updated monthly. Past performance is no assurance of
     future results.

</TABLE>

     2

<PAGE>   3

FROM THE CHAIRMAN

     DEAR SHAREHOLDER:

     MUNICIPAL BOND INVESTORS HAVE EXPERIENCED MORE THAN THEIR SHARE OF 
     FRUSTRATION OVER THE PAST SEVERAL MONTHS AS THE FIXED-INCOME MARKETS
     ENDURE A PROLONGED PERIOD OF VOLATILITY.  PUTNAM HIGH YIELD MUNICIPAL
     TRUST'S PERFORMANCE DURING THE SIX MONTHS ENDED SEPTEMBER 30, 1994,
     REFLECTS THIS UNSETTLED ENVIRONMENT.

     DESPITE  THE  LACKLUSTER  PERFORMANCE, SOME SIGNS OF
     ENCOURAGEMENT ARE BEGINNING TO APPEAR FOR INVESTORS IN TAX-EXEMPT 
     SECURITIES. SUPPLIES MAY BECOME TIGHTER AS MORE INVESTORS SEEK 
     TAX RELIEF; AS WITH ANY COMMODITY, MORE DOLLARS CHASING FEWER 
     GOODS SHOULD TRANSLATE INTO HIGHER PRICES, A BOON TO INVESTORS. MANY
     SECTORS OF THE TAX-EXEMPT MARKET, INCLUDING HEALTH CARE, EDUCATION, 
     AND RESOURCE RECOVERY, ARE POISED FOR GROWTH, WHICH SHOULD BODE WELL 
     OVER THE LONG TERM FOR INVESTMENTS IN THOSE AREAS.

     WITH CONSIDERABLE CREDIT RESEARCH AND ANALYSIS CAPABILITIES BEHIND HIM, 
     FUND MANAGER TRIET NGUYEN WILL CONTINUE SEEKING OUT THE MOST PROMISING
     TAX-EXEMPT INVESTMENTS FOR YOUR FUND. HIS REPORT ON FISCAL '94
     PERFORMANCE AND WHAT HE SEES IN STORE FOR FISCAL '95 FOLLOWS.




     RESPECTFULLY YOURS,


     GEORGE PUTNAM
     CHAIRMAN OF THE TRUSTEES
     OCTOBER 19, 1994

     3

<PAGE>   4


REPORT FROM THE FUND MANAGER
TRIET NGUYEN


        Putnam High Yield Municipal Trust's emphasis on higher-yielding 
        tax-exempt securities proved particularly valuable during the six     
        months ended September 30, 1994. This focus made your fund less 
        sensitive to recent interest rate increases than most 
        investment-grade municipal bond funds. As the performance table on page 
        8 shows, the decline in the fund's shares at net asset  value 
        was less severe than that of the Lehman Brothers Municipal Bond
        Index, a widely used gauge of the tax-exempt bond market. The
        fund's performance over longer periods was roughly in line with that of
        the index.

        The economy, however, has been more resilient than generally 
        expected. This has been a plus for high-yield municipal bonds, whose  
        prices, like their corporate high-yield counterparts, are influenced
        by the pace of the economy, as well as interest rate trends.

     -  STATE AND SECTOR STRATEGIES

        We have made no significant changes in your fund's portfolio 
        structure during this semiannual period. The fund remains well
        diversified throughout the country, with a greater emphasis on the
        higher-tax states. These include Massachusetts, New York, 
        Pennsylvania, and, especially, California, where we have begun
        building up assets. While the California economy has suffered its
        share of difficulties in recent years, the tide now appears to 
        have turned. Major economic indicators have stabilized and the state's
        overall business climate is improving. Furthermore, we believe
        California, with one of the world's largest economies, stands to
        benefit from any positive global economic forces or developments such
        as the General Agreement on Tariffs and Trade (GATT) and the North 
        American Free Trade Agreement (NAFTA) treaties.


        4
<PAGE>   5

        Although overall allocations may not have changed much, we continue
        to re-evaluate the fund's sector strategy in light of current economic
        trends. For example, we have begun to de-emphasize early cyclical
        industries such as housing and transportation. However, we believe 
        late cyclicals still offer potential in today's economic
        environment. These sectors, which include paper and environmental 
        services, currently appear poised for growth and we are
        positioning the fund to benefit from their strength in the future.

        We continued to add to the resource recovery sector of the 
        portfolio. Over time, we believe these facilities devoted to
        recycling and converting trash into fuel will gain a broader 
        acceptability and, therefore, receive higher credit ratings. This is
        likely to contribute to higher prices down the road.


    -   SUPPLY/DEMAND UPDATE

        While  perhaps not apparent to most investors, an environment of
        decreased supply and increased demand has helped insulate the
        municipal bond market from excess volatility. In comparison to 1993's
        record new issuance, 1994's crop of new-issue municipal bonds is down
        by more than 40%. This reflects the fact that of the $290
        billion worth of new issues that came to market in 1993, nearly 70% 
        were issued to prerefund older higher-coupon bonds destined to be
        called in long before maturity. Thus, the bond supply was
        contracting at a time when investors' demand for tax relief remained
        strong.



<TABLE>
        -----------------------------------------------------
        TOP INDUSTRY SECTORS*
        -----------------------------------------------------
        <S>                                             <C>
        Hospitals/Health Care                           27.1%
        -----------------------------------------------------
        Transportation                                  23.4%
        -----------------------------------------------------
        Utilities                                        7.0%
        -----------------------------------------------------
        Energy                                           4.8%
        -----------------------------------------------------
        Housing                                          4.5%
<FN>
      * Based on net assets on 9/30/94.
</TABLE>

        5

<PAGE>   6


        We believe investors have come to realize that tax-free bonds 
        will be in short supply going forward. Meanwhile, demand for this
        dwindling avenue of tax relief remains poised to outpace supply as
        individuals seek shelter from higher taxes. Apparently, our view is 
        shared by others. A recent BusinessWeek article, "Why munis could
        lift your bond market blues," (October 10, 1994) states: "Yields on
        long-term munis currently equal about 80% of the yields on taxable
        treasury securities. That means anyone above the 15% bracket is
        better served in tax-frees." While investors must keep in mind that
        municipal bonds carry greater levels of credit and liquidity risks than 
        some other fixed income securities, such as Treasuries, in our
        opinion municipal bonds are now among the few fixed-income
        investments that appear well on their way to a solid recovery.

    -   LEVERAGING UPDATE

        Your fund has the ability to use leveraging to enhance the return 
        to common shareholders. Leveraging allows Putnam Management to 
        issue preferred shares with dividends based on short-term
        interest rates and invest the proceeds in longer-term bonds, which pay
        interest at a higher rate. Consequently, interest income over and
        beyond that needed to pay dividends on the preferred stock can be 
        passed on to the common shareholders. Because of the currently
        steep yield curve in municipal bonds, leveraging continues to make 
        sense in  this interest rate environment and is an important tool 
        in achieving the fund's objective of high current income. At the 
        end of the period, approximately 19.3% of the portfolio was leveraged
        in this fashion.

    -   OVERALL MARKET OUTLOOK

        While municipal bond fund investors have had to endure a rather 
        volatile market this year, we believe your fund has shown its 
        strength -- even within a market sector that, over time, has
        outperformed most other municipal bond investments. Although we
        continue to be optimistic, we expect that the current pace of 
        economic growth cannot continue indefinitely. We expect no 
        significant changes in the economy for the rest of the fiscal year
        and into fiscal 1995, but looking further ahead, it appears likely
        that the pace will slow to some extent.


        6
<PAGE>   7

    -------------------------------------------------------------
    TOP 10 ISSUERS (9/30/94)
    -------------------------------------------------------------
    DENVER, COLORADO,
    City and County Airport revenue bonds
    -------------------------------------------------------------
    PORT CORPUS CHRISTI, TEXAS,
    Industrial Development Corp. revenue bonds
    -------------------------------------------------------------
    CHICAGO, ILLINOIS,
    O'Hare International Airport Special Facility revenue bonds
    -------------------------------------------------------------
    GILA COUNTY, ARIZONA,
    Industrial Development, Pollution Control revenue bonds
    -------------------------------------------------------------
    IOWA FINANCIAL AUTHORITY,
    Health Care Facility revenue bonds
    -------------------------------------------------------------
    MASSACHUSETTS PORT AUTHORITY,
    Special project revenue bonds
    -------------------------------------------------------------
    CLAIBORNE COUNTY, MISSISSIPPI,
    Pollution Control revenue bonds
    -------------------------------------------------------------
    MASSACHUSETTS STATE INDUSTRIAL FINANCIAL AGENCY,
    Resource Recovery revenue bonds
    -------------------------------------------------------------
    HAMMOND, INDIANA,
    Port Authority certificate of participation
    -------------------------------------------------------------
    CALIFORNIA HEALTH FACILITY AUTHORITY
    revenue bonds   

    These holdings represent 39.5% of the fund's net assets. Portfolio          
    holdings are subject to change.

    In considering current and future market trends, it is important for
    investors to keep in mind that every market shift carries some 
    opportunities with it. We will continue working to position your 
    fund to benefit from  upcoming developments in the months ahead.

    The views expressed here are exclusively those of Putnam
    Management. They are not meant as investment advice. Although the described 
    holdings were viewed favorably as of September 30, 1994, there is
    no guarantee the fund will continue to hold these securities in the future.

    7
<PAGE>   8


PERFORMANCE SUMMARY

     This section provides, at a glance, information about your fund's
     performance.  Total return shows how the value of the fund's shares 
     changed over time, assuming you held the shares through the entire
     period and reinvested all distributions back into the fund. We show total
     return in two ways: on a cumulative long-term basis and on average how
     the fund might have grown each year over varying periods. For comparative
     purposes, we show how the fund performed relative to appropriate indexes
     and benchmarks.

<TABLE>
     TOTAL RETURN FOR PERIODS ENDED 9/30/94

<CAPTION>
                                                      Lehman Bros.
                                                       Municipal
                         NAV         Market price     Bond Index       CPI
     ------------------------------------------------------------------------
     <S>                <C>             <C>             <C>            <C>
     1  year            -1.64%          -4.43%          -2.44%          2.96%
     ------------------------------------------------------------------------
     5 years            46.09           46.03           46.85          19.52
     Annual average      7.88            7.87            7.99           3.63
     ------------------------------------------------------------------------
     Life of fund       49.77           47.21           48.95          20.68
     (since 5/25/89)
     Annual average      7.84            7.50            7.73           3.58
     ------------------------------------------------------------------------
</TABLE>

     Performance data represent past results. Investment returns and net 
     asset value will fluctuate so an investor's shares, when sold, 
     may be worth more or less than their original cost. Fund performance 
     data do not take into account any adjustment for taxes payable on
     reinvested distributions.

     TERMS AND DEFINITIONS

     NET ASSET VALUE (NAV) is the value of all your fund's assets, minus 
     any liabilities, the liquidation preference and cumulative undeclared
     dividends on the remarketed preferred shares, divided by the number of
     outstanding common shares.

     MARKET PRICE is the current trading price of one share of the fund. 
     Market prices are set by transactions between buyers and sellers on the
     New York Stock Exchange.

     COMPARATIVE BENCHMARKS

     LEHMAN BROTHERS MUNICIPAL BOND INDEX is an unmanaged list of long-term 
     fixed-rate investment-grade tax-exempt bonds representative of the 
     municipal bond market. The index may include bonds different from 
     those in the fund, and may pose different risks than the fund.

     CONSUMER PRICE INDEX (CPI) is a commonly used measure of   
     inflation; it does not represent an investment return.

     8

<PAGE>   9

<TABLE>
PORTFOLIO OF INVESTMENTS OWNED
September 30, 1994 (Unaudited)

<CAPTION>
MUNICIPAL BONDS AND NOTES (98.2%)(A)
PRINCIPAL AMOUNT                                                     RATINGS(B)       VALUE
<S>             <C>                                                     <C>     <C>
ARIZONA (5.1%)
- -------------------------------------------------------------------------------------------
$  1,450,000    AZ Hlth. Fac. Auth. Hosp. Syst. Rev. Bonds
                (St. Luke's Hosp. Syst.), Ser. A, 101\8s, 11/1/15       Ba      $ 1,517,062
   6,235,000    Gila Cnty., Indl. Dev. Auth. Poll. Control Rev.
                Bonds, Ser. 85, 8.9s, 7/1/06                            Baa       6,889,675
   3,000,000    Tucson, Arpt. Auth. Special Fac. Rev. Bonds
                (Lockheed  Aermod Ctr. Inc.), 8.7s, 9/1/19              A         3,390,000
                                                                                -----------
                                                                                 11,796,737
CALIFORNIA (9.7%)
- -------------------------------------------------------------------------------------------
                CA Hlth. Fac. Auth. Rev. Bonds
   1,800,000    (Summit Med. Ctr.), Ser. 85A, 9s, 5/1/15                Ba        1,833,750
   4,030,000    (Valley Presbyterian Hosp. Project),
                Ser. A, 9s, 5/1/12                                      B         4,070,300
   2,215,000    CA State Pub. Works Board Lease Rev. Bonds
                (Dept. of Corrections-State Prisons), Ser. A,
                American Municipal Bond Assurance Corp.
                (AMBAC), 5s, 12/1/19                                    AAA       1,785,843
   5,700,000    CA Statewide Cmntys., Dev. Auth. Inverse
                Floating Rate Note (I/F), Certif. of Participation 
                (COP) (Motion Picture & TV Fund), AMBAC,
                5.35s, 1/1/22 (c)                                       AAA       3,940,125
   2,000,000    La Habra, COP (Friendly Hills Hlth. Care
                Foundation), Ser. A, 7.15s, 7/1/23                      BB/P      2,000,000
   2,500,000    Los Angeles Cnty., Metro. Trans. Auth. Sales
                Tax Rev. Bonds, Ser. B, AMBAC, 43\4s, 7/1/18            AAA       1,925,000
   1,320,000    Los Angeles, Wastewtr. Syst. Rev. Bonds, Ser. B,
                Municipal Bond Insurance Association (MBIA),
                5.7s, 6/1/23                                            AAA       1,189,650
   1,000,000    Orange Cnty., Sanitation Dists. COP Variable
                Rate Demand Note (VRDN), Ser. C, Financial
                Guaranty Insurance Corp. (FGIC), 3.45s, 8/1/17          VMIG1     1,000,000
     450,000    San Bernardino, Hosp. Rev. Bonds (San
                Bernardino Cmnty. Hosp.), 77\8s, 12/1/19                Ba          434,250
   2,000,000    San Jose, Redev. Agcy. Tax Alloc. Rev. Bonds
                (Merged Area Redev. Project), MBIA, 5s, 8/1/20          AAA       1,602,500
   3,000,000    Santa Margarita/Dana Point, Auth. Rev. Bonds,
                Ser. B, MBIA, 53\4s, 8/1/20                             AAA       2,745,000
                                                                                -----------
                                                                                 22,526,418
COLORADO (7.1%)
- -------------------------------------------------------------------------------------------
                Denver, City & Cnty. Arpt. Rev. Bonds
   5,000,000    Ser. A, 83\4s, 11/15/23                                 Baa       5,275,000
   3,350,000    Ser. A, 81\2s, 11/15/23                                 Baa       3,471,438
   1,350,000    Ser. A, 71\2s, 11/15/23                                 Baa       1,290,937
   4,200,000    Ser. B, 71\4s, 11/15/23                                 Baa       3,937,500
</TABLE>
9
<PAGE>   10

<TABLE>
<CAPTION>
MUNICIPAL BONDS AND NOTES (98.2%)(A)
PRINCIPAL AMOUNT                                                     RATINGS(B)       VALUE
<S>             <C>                                                     <C>     <C>
COLORADO (continued)
- -------------------------------------------------------------------------------------------
$  3,000,000    Denver, City & Cnty. Special Fac. Arpt. Rev.
                Bonds (United Air Lines, Inc. Project), Ser. A,
                67\8s, 10/1/32                                          Baa     $ 2,670,000
                                                                                -----------
                                                                                 16,644,875
CONNECTICUT (1.2%)
- -------------------------------------------------------------------------------------------
   1,850,000    CT State Dev. Auth. 1st. Mtge. Rev. Bonds
                (East  Hill  Woods Project),  83\4s,  7/1/19            B/P       1,887,000
   1,000,000    CT State Dev. Auth. Hlth. Care Rev. Bonds
                (AHF/Windsor Inc. Project), Ser. A, 91\2s, 1/1/22       B/P       1,026,250
                                                                                -----------
                                                                                  2,913,250
FLORIDA (1.6%)
- -------------------------------------------------------------------------------------------
   3,965,000    Levy Cnty., Indl. Dev. Rev. Bonds (National Med.
                Assn. Inc. Project), 10s, 7/1/19                        B/P       3,746,925
GEORGIA (2.3%)
- -------------------------------------------------------------------------------------------
   2,175,000    Atlanta, Special Purpose Fac. Rev. Bonds
                (Delta Air Lines, Inc. Project), Ser. B, 7.9s, 12/1/18  Ba        2,202,187
   3,025,000    De Kalb Cnty., Hsg. Auth. Muni. Rev. Bonds
                (Briarcliff Park Apts. Project), Ser. B, 10s, 4/1/17    BB/P      3,115,750
                                                                                -----------
                                                                                  5,317,937
ILLINOIS (7.8%)
- -------------------------------------------------------------------------------------------
   3,250,000    Chicago, O'Hare Intl. Arpt. Rev. Bonds, Ser. A, 
                105\8s, 1/1/15                                          A         3,392,187
                Chicago, O'Hare Intl. Arpt. Special Fac. Rev. Bonds
   1,463,000    (United Air Lines, Inc.), Ser. B, 8.95s,  5/1/18        Baa       1,605,642
   1,900,000    (United Air Lines, Inc.), Ser. 84A, 8.85s, 5/1/18       Baa       2,075,750
   3,845,000    (United Air Lines, Inc.), Ser. C,  8.2s,  5/1/18        Baa       4,056,475
   3,000,000    (American Airlines, Inc. Project), Ser. A,
                77\8s, 11/1/25                                          Baa       3,097,500
   1,835,000    IL Dev. Fin. Auth. Rev. Bonds (Cmnty. Rehab.
                Providers Fac.), 83\4s, 3/1/10                          BBB/P     1,867,113
   2,015,000    IL Edl. Fac. Auth. Rev. Bonds (Steppenwolf
                Theatre Project), 9.65s,  7/1/19                        BB/P      2,085,525
                                                                                -----------
                                                                                 18,180,192
INDIANA (2.6%)
- -------------------------------------------------------------------------------------------
   5,820,842    Hammond, Indl. Port Auth. COP, 9.65s, 6/1/14            BB/P      5,973,639

IOWA (2.8%)
- -------------------------------------------------------------------------------------------
   6,500,000    IA Fin. Auth. Hlth. Care Fac. Rev. Bonds
                (Mercy Hlth. Initiatives Project), 9.95s, 7/1/19        B/P       6,500,000

KENTUCKY (1.5%)
- -------------------------------------------------------------------------------------------
   1,500,000    Jefferson Cnty., 1st Mtge. Rev. Bonds
                (AHF/KY-IOWA  Inc. Project), 101\4s, 1/1/20             B/P       1,543,125
   1,675,000    Louisville & Jefferson Cnty., Regl. Arpt. Syst. Rev.
                Bonds, Ser. A, MBIA, 81\2s, 7/1/17                      AAA       1,825,750
                                                                                -----------
                                                                                  3,368,875
</TABLE>

10

<PAGE>   11

<TABLE>
<CAPTION>
MUNICIPAL BONDS AND NOTES (98.2%)(A)
PRINCIPAL AMOUNT                                                     RATINGS(B)       VALUE
<S>             <C>                                                     <C>     <C>
LOUISIANA (5.3%)
- -------------------------------------------------------------------------------------------
$  2,875,000    Hodge, Combined Util. Rev. Bonds
                (Stone Container Corp.), 9s, 3/1/10                     B/P     $ 2,997,188
                LA Pub. Fac. Auth. 1st. Mtge. Rev. Bonds
   1,953,099    (Emily  Morten  Foundation),  101\4s, 5/1/19            B/P       2,060,519
   2,500,000    (St.  James  Place  Project), 10s, 11/1/21              B/P       2,678,125
   1,000,000    Port of New Orleans, Indl. Dev. Rev. Bonds
                (Continental Grain Co. Project), 141\2s, 1/1/02         BB        1,133,750
   3,440,000    St. James Parish, Solid Waste Disp. Rev. Bonds
                (Kaiser  Aluminum  Project), 73\4s, 8/1/22              B/P       3,530,300
                                                                                -----------
                                                                                 12,399,882
MASSACHUSETTS (9.0%)
- -------------------------------------------------------------------------------------------
   2,000,000    MA Hlth. & Edl. Fac. Auth. Rev. Bonds (Rehab.
                Hosp. Cape & Islands), Ser. A, 77\8s, 8/15/24           BB/P      1,965,000
   5,800,000    MA Port Auth. Special Project Rev. Bonds
                (Harborside Hyatt), 10s, 3/1/26                         B/P       6,242,250
   2,000,000    MA State Hlth. & Edl. Fac. Auth. Residual Interest
                Bonds (RIBS) (St. Elizabeth Hosp.), Ser. E,
                Financial  Security Assurance (FSA), 9.97s, 8/15/21     AAA       2,052,500
   1,390,000    MA State Hlth. & Edl. Fac. Auth. Rev. Bonds
                (St. Joseph's Hosp.), Ser. C, 91\2s, 10/1/20            AAA       1,671,475
                MA State Indl. Fin. Agcy. Resource Recvy.
                Rev. Bonds (Southeastern MA Project)
   2,000,000    Ser. B,  91\4s, 7/1/15                                  BB/P      2,225,000
   3,500,000    Ser. A,  9s, 7/1/15                                     BB/P      3,876,250
                MA State Indl. Fin. Agcy. Rev. Bonds
   1,000,000    (Oddfellows Home  of  MA), 9.6s, 1/1/15                 BB/P      1,052,500
   2,000,000    (Evanswood Bethzatha), Ser. A, 77\8s, 1/15/20           BB/P      1,960,000
                                                                                -----------
                                                                                 21,044,975
MICHIGAN (3.7%)
- -------------------------------------------------------------------------------------------
   2,788,000    Detroit, Hosp. Fin. Auth. Hosp. Fac. Rev. Bonds
                (MI Hlth. Care Corp. Project), 10s, 12/1/20             B         2,889,065
   2,815,000    Detroit, Local Dev. Fin. Auth. Tax Increment
                Rev. Bonds, Ser. A, 91\2s, 5/1/21                       BBB/P     3,437,819
     990,000    MI State Strategic Fund Ltd. Oblig. Rev. Bonds
                (MI Hlth. Care Corp. Project), 9.1s, 12/1/14            B/P         968,963
   1,250,000    Wayne Charter Cnty., Special Arpt. Fac. Rev.
                Bonds (Republic Air Lines Inc. Project), Ser. C,
                103\8s, 12/1/15                                         B/P       1,325,000
                                                                                -----------
                                                                                  8,620,847
MISSISSIPPI (2.6%)
- -------------------------------------------------------------------------------------------
                Claiborne Cnty., Poll. Control Rev. Bonds
    2,500,000   (Syst. Energy Resources Inc.),  121\2s,  6/15/15        Baa       2,690,625
    3,000,000   (Middle South Energy Inc.), Ser. C, 97\8s, 12/1/14      BBB/P     3,450,000
                                                                                -----------
                                                                                  6,140,625
MISSOURI (2.3%)
- -------------------------------------------------------------------------------------------
    5,000,000   Kansas City, Indl. Dev. Auth. Hlth. Fac. Rev.
                Bonds (Park Lane Med. Ctr. Project), 83\4s, 1/1/15      BBB/P     5,400,000
NEBRASKA (0.4%)
- -------------------------------------------------------------------------------------------
    1,000,000   NE Investment Fin. Auth. Hosp. Rev. RIBS,
                MBIA, 9.64s, 11/15/16                                   AAA       1,012,500
</TABLE>

11

<PAGE>   12
<TABLE>
<CAPTION>
MUNICIPAL BONDS AND NOTES (98.2%)(A)
PRINCIPAL AMOUNT                                                     RATINGS(B)       VALUE
<S>             <C>                                                     <C>     <C>
NEW HAMPSHIRE (2.6%)
- -------------------------------------------------------------------------------------------
$  1,955,000    NH Higher Edl. & Hlth. Fac. Auth. Rev. Bonds
                (Havenwood/Heritage Heights), 93\4s, 12/1/19            B/P     $ 2,086,963
   3,500,000    NH State Indl. Dev. Auth. Poll. Control Rev. Bonds                
                (United Illuminating Co.), Ser. B,  103\4s, 10/1/12     Baa       4,033,750
                                                                                -----------
                                                                                  6,120,713
NEW JERSEY (2.8%)
- -------------------------------------------------------------------------------------------
   5,000,000    Camden Cnty., Impt. Auth. Hsg. Dev. Rev. Bonds
                (Chestbury  Apts. Project), 83\4s,  12/15/16            BB/P      4,475,000
   2,000,000    NJ State Hsg. & Mtge. Fin. Agcy. RIBS, Ser. 1,
                8.594s, 11/1/07 (acquired 6/23/93, cost                 
                $2,120,500)(d)                                          A         1,972,500
                                                                                -----------
                                                                                  6,447,500
NEW YORK (5.0%)
- -------------------------------------------------------------------------------------------
   3,000,000    Metro. Trans. Auth. of NY Rev. Bonds
                (Trans. Fac.), Ser. O, 53\4s,  7/1/13                   Baa       2,715,000
     900,000    NY City, Muni. Wtr. Fin. Auth. VRDN,
                Ser. G, FGIC, 3.6s,  6/15/24                            VMIG1       900,000
     900,000    NY City, VRDN, Ser. B, FGIC, 3.3s, 10/1/22              VMIG1       900,000
   3,000,000    NY State Hsg. Fin. Agcy. Svcs. Contract Oblig.
                Rev.  Bonds,  Ser. A,  73\8s,  9/15/21                  AAA       3,408,750
                NY State Local Govt. Assistance Corp. Rev. Bonds
   1,500,000    Ser.  A, 7s, 4/1/16                                     AAA       1,665,000
   2,000,000    Ser.  D, 63\4s, 4/1/21                                  AAA       2,197,500
                                                                                -----------
                                                                                 11,786,250
OHIO (4.7%)
- -------------------------------------------------------------------------------------------
   1,500,000    Clermont Cnty., Hosp. Facs., I/F, AMBAC,
                9.641s, 9/1/21 (c)                                      AAA       1,537,500
   4,550,000    Dayton, Special Fac. Rev. Bonds (Emery Air
                Freight Corp.), Ser. A, 121\2s, 10/1/09                 B/P       5,295,063
   3,000,000    Lorain Cnty., Fac. Rev. Bonds (Laurel Lake
                Project), 71\8s, 12/15/18                               BB/P      2,906,250
   1,185,000    OH State Air Quality Dev. Auth. Rev. Bonds
                (Dayton Pwr. & Lt. Co. Project), 91\2s, 12/1/15         AA        1,272,394
                                                                                -----------
                                                                                 11,011,207
PENNSYLVANIA (7.7%)
- -------------------------------------------------------------------------------------------
   1,000,000    Allegheny Cnty., Indl. Dev. Auth. Arpt. Special
                Fac. Rev. Bonds (USAir, Inc. Project),  Ser. A,
                87\8s, 3/1/21                                           B         1,006,250
   3,500,000    Beaver Cnty., Indl. Dev. Auth. Poll. Control Rev. Bonds 
                (Cleveland Elec. Illuminating Co.),  101\2s, 9/1/15     Ba        3,696,875
   1,000,000    Langhorne, St. Mary Hosp. Auth. Rev. Bonds
                (Francisan Hlth. Syst.) Ser. C, VRDN, 3.6s, 12/1/24     VMIG1     1,000,000
                Montgomery Cnty., Higher Edl. & Hlth.
                Auth. Hosp. Rev. Bonds
   1,940,000    (United Hospital Inc.-St. Christopher), 81\2s, 11/1/17  Ba        2,007,900
   2,000,000    (United Hospital Inc.), Ser. A, 83\8s, 11/1/11          Ba        2,077,500
   2,500,000    PA Higher Edl. Assistance Agcy. Student Loan
                RIBS, AMBAC, 10.12s, 9/3/26                             AAA       2,487,500
</TABLE>
12

<PAGE>   13
<TABLE>
<CAPTION>
MUNICIPAL BONDS AND NOTES (98.2%)(A)
PRINCIPAL AMOUNT                                                     RATINGS(B)       VALUE
<S>             <C>                                                     <C>     <C>
PENNSYLVANIA (continued)
- -------------------------------------------------------------------------------------------
$  2,100,000    Philadelphia, Muni. Auth. Rev. Bonds (Justice
                Lease), Ser. C, 85\8s, 11/15/16                         AAA    $  2,527,875
   3,400,000    Philadelphia, Regl. Port Auth. Lease I/F,
                MBIA, 8.87s, 9/1/13                                     AAA       3,247,000
                                                                                -----------
                                                                                 18,050,900
PUERTO RICO (0.4%)
- -------------------------------------------------------------------------------------------
   1,000,000    Cmnwlth. of Puerto Rico, Tel. Auth. RIBS, MBIA,
                6.792s, 1/1/05 (acquired 4/23/93, cost $1,043,660)(d)   A           918,750

SOUTH CAROLINA (0.3%)
- -------------------------------------------------------------------------------------------
   1,000,000    Charleston Cnty., Hosp. Fac.
                I/F (Bon Secours Hlth. Ctr.),
                Ser. B, FSA 7.979s,  8/15/13                            AAA         770,000

TEXAS (8.2%)
- -------------------------------------------------------------------------------------------
   1,000,000    Bell Cnty., Hlth. Fac. Dev. Corp. Rev. Bonds
                (Adv. Living Tech. Inc. Project), Ser. A,
                101\2s, 6/15/18                                         B/P         920,000
   2,705,000    Calhoun Cnty., West Side Navy Dist. Solid
                Waste Disp. Rev. Bonds (Union Carbide
                Chemicals Project),  6.4s,  5/1/23                      Baa       2,468,313
     765,000    Cherokee Cnty., Hlth. Fac. Dev. Corp. Hosp.
                Rev. Bonds (Nancy Travis Memorial Hosp.
                Project), 10s,  5/15/13                                 B/P         808,031
   3,105,059    Maverick Cnty., COP (Jail Facility), 9.1s, 6/15/10      CCC/P     1,863,035
                Port  Corpus Christi, Indl. Dev. Corp. Rev. Bonds
                (Valero Refining & Marketing Co.)
   5,500,000    Ser. B, 105\8s, 6/1/08                                  Baa       6,194,375
   4,480,000    Ser. A, 101\4s, 6/1/17                                  Baa       5,000,800
   1,800,000    Rio Grande Valley, Hlth. Fac. Dev. Corp.
                Retirement Fac. I/F, (Golden Palms), Ser. D,
                MBIA, 7.646s, 8/1/06                                    AAA       1,836,000
                                                                                -----------
                                                                                 19,090,554
VIRGINIA (1.1%)
- -------------------------------------------------------------------------------------------
   2,505,000    Hopewell, Indl. Dev. Auth. Resource Recvy. Rev.
                Bonds (Stone Container Corp. Project), 81\4s, 6/1/16    B/P       2,592,675

WISCONSIN (0.4%)
- -------------------------------------------------------------------------------------------
     900,000    WI Hsg. & Econ. Dev. Auth. RIBS
                (Homeownership Dev. Program), 10.291s, 10/25/22         AA          900,000
                                                                               ------------
                TOTAL INVESTMENTS
                (cost $231,739,212)(e)                                         $229,276,226
                                                                               ============
<FN>
NOTES
- -------------------------------------------------------------------------------------------

(a)  Percentages indicated are based on total net assets of $233,522,114. Net
     assets available to common shareholders are $188,513,114, which correspond
     to a net asset value per common share of $8.95.

</TABLE>

13
<PAGE>   14


(b) The Moody's or Standard & Poor's ratings indicated  are believed to be the
    most recent ratings available at September 30, 1994  for the securities 
    listed.  Ratings are generally ascribed to securities at the time  of
    issuance. While the agencies may from time to time revise such ratings, 
    they undertake no obligation to do so, and the ratings indicated do
    not necessarily represent ratings which the agencies would ascribe to these
    securities at September 30, 1994. Securities rated by Putnam are indicated
    by "/P" and are not publicly rated.

(c) These securities were pledged to cover margin requirements for
    futures contracts at September 30, 1994. The market value of        
    segregated securities with the custodian for transactions on futures 
    contracts is $5,477,625 or 2.3% of net assets.

(d) Restricted as to public resale excluding 144A Securities. At the date of 
    acquisition these securities were valued at cost. There were no
    outstanding unrestricted securities of the same class as those held.
    Total market value of restricted securities owned at September
    30, 1994 was $2,891,250 or 1.2% of net assets.

(e) The aggregate identified cost on a tax basis is $231,739,212
    resulting in gross unrealized appreciation and depreciation of $6,844,456  
    and $9,307,442 respectively, or net unrealized depreciation of $2,462,986.

    The rates shown on Residual Interest Bonds (RIBS) and Inverse Floating
    Rate Notes (I/F) which are securities paying variable interest rates that
    vary inversely to changes in market interest rates, and Variable Rate      
    Demand Notes (VRDN) are the current interest rates at September 30, 
    1994, which are subject to change based on the terms of the security.

    The fund had the following industry group concentrations greater than 10%
    on September 30, 1994 (as a percentage of net assets):

    Hospitals/Healthcare                  27.1%
    Transportation                        23.4

<TABLE>
    The table  below shows the percentages of the fund's investments on
    September 30,  1994 in securities assigned to the various rating categories
    by Moody's  and  Standard  & Poor's and in unrated securities  determined 
    by Putnam Management to be of comparable quality:

<CAPTION>
                                                        UNRATED SECURITIES
                         RATED SECURITIES             OF COMPARABLE QUALITY,
                         AS A PERCENTAGE OF             AS A PERCENTAGE OF
RATING                   FUND'S NET ASSETS              FUND'S NET ASSETS
<S>                             <C>                            <C>
- ----------------------------------------------------------------------------
"AAA"/"Aaa"                     16.9%                           --
- ----------------------------------------------------------------------------
"AA"/"Aa"                        0.9                            --                                                               
- ----------------------------------------------------------------------------
"A"/"A"                          4.1                            --                                                               
- ----------------------------------------------------------------------------
"BBB"/"Baa"                     24.6                           6.1%
- ----------------------------------------------------------------------------
"BB"/"Ba"                        6.4                          13.6
- ----------------------------------------------------------------------------
"B"/"B"                          3.4                          19.8
- ----------------------------------------------------------------------------
"CCC"/"Caa"                       --                           0.8
- ----------------------------------------------------------------------------
"VMIG1"                          1.6                            --                                                               
- ----------------------------------------------------------------------------
                                57.9%                         40.3%
- ----------------------------------------------------------------------------
</TABLE>
<TABLE>
U.S. TREASURY FUTURES OUTSTANDING at September 30, 1994
<CAPTION>
                                         AGGREGATE    EXPIRATION   UNREALIZED
                        TOTAL VALUE     FACE VALUE          DATE  APPRECIATION
- ------------------------------------------------------------------------------
<S>                     <C>             <C>            <C>          <C>
U.S. Treasury Bond 
Futures (Sell)          $4,946,875      $4,953,125     Dec. 94      $6,250
- ----------------------------------------------------------------------------
</TABLE> 

The accompanying notes are an integral part of these financial statements. 

14

<PAGE>   15

<TABLE>
STATEMENT OF ASSETS AND LIABILITIES
September 30, 1994 (Unaudited)


<S>                                                                             <C>
ASSETS
- --------------------------------------------------------------------------------------------
Investments in securities, at value (identified cost $231,739,212)(Note 1)      $229,276,226
- --------------------------------------------------------------------------------------------
Cash                                                                                 348,967
- --------------------------------------------------------------------------------------------
Receivable for securities sold                                                       113,207
- --------------------------------------------------------------------------------------------
Interest receivable                                                                5,630,376
- --------------------------------------------------------------------------------------------
Receivable for variation margin on open futures contracts                              6,250
- --------------------------------------------------------------------------------------------
TOTAL ASSETS                                                                     235,375,026

LIABILITIES
- --------------------------------------------------------------------------------------------
Distributions payable to shareholders                                              1,316,475
- --------------------------------------------------------------------------------------------
Payable for compensation of Manager (Note 3)                                         414,943
- --------------------------------------------------------------------------------------------
Payable for compensation of Trustees (Note 3)                                          1,686
- --------------------------------------------------------------------------------------------
Payable for investor servicing and custodian fees (Note 3)                            55,440
- --------------------------------------------------------------------------------------------
Payable for administrative services (Note 3)                                           3,546
- --------------------------------------------------------------------------------------------
Other accrued expenses                                                                60,822
- --------------------------------------------------------------------------------------------
Total liabilities                                                                  1,852,912
- --------------------------------------------------------------------------------------------
Net assets                                                                      $233,522,114
- --------------------------------------------------------------------------------------------
REPRESENTED BY
- --------------------------------------------------------------------------------------------
Series A remarketed preferred shares, without par value;
8,000 shares authorized (900 shares issued at $50,000 per
share liquidation preference) (Note 2)                                          $ 45,000,000
Common shares, without par value; unlimited shares
authorized; 21,063,733 shares outstanding (Note 1)                               194,237,641
Undistributed net investment income (Note 1)                                         272,706
Accumulated net realized loss on investments and futures transactions             (3,531,497)
Net unrealized depreciation of investments and futures contracts                  (2,456,736)
- --------------------------------------------------------------------------------------------
NET ASSETS                                                                      $233,522,114
- --------------------------------------------------------------------------------------------
COMPUTATION OF NET ASSET VALUE
- --------------------------------------------------------------------------------------------
Remarketed   preferred   shares  at  liquidation   preference                   $ 45,000,000
Cumulative undeclared dividends on remarketed preferred shares                         9,000
- --------------------------------------------------------------------------------------------
Net assets allocated to remarketed preferred shares at liquidation preference     45,009,000
- --------------------------------------------------------------------------------------------
Net assets available to common shares:
Net asset value per share $8.95 ($188,513,114 divided by
21,063,733 shares)                                                               188,513,114
- --------------------------------------------------------------------------------------------
NET ASSETS                                                                      $233,522,114
- --------------------------------------------------------------------------------------------
</TABLE>

The accompanying notes are an integral part of these financial statements.

15
<PAGE>   16

<TABLE>
STATEMENT OF OPERATIONS
Six months ended September 30, 1994 (Unaudited)


<S>                                                             <C>
- --------------------------------------------------------------------------
TAX  EXEMPT INTEREST INCOME                                     $9,621,116

EXPENSES:
- --------------------------------------------------------------------------
Compensation  of Manager (Note 3)                                  819,528
- --------------------------------------------------------------------------
Investor servicing and custodian fees (Note  3)                    111,397
- --------------------------------------------------------------------------
Compensation of Trustees (Note 3)                                    7,480
- --------------------------------------------------------------------------
Reports to shareholders                                             30,840
- --------------------------------------------------------------------------
Auditing                                                            31,413
- --------------------------------------------------------------------------
Legal                                                               12,465
- --------------------------------------------------------------------------
Postage                                                             28,309
- --------------------------------------------------------------------------
Administrative services (Note 3)                                     5,984
- --------------------------------------------------------------------------
Exchange listing fees                                               15,998
- --------------------------------------------------------------------------
Amortization of organization expenses (Note 1)                       1,668
- --------------------------------------------------------------------------
Preferred share remarketing agent fees                              64,021
- --------------------------------------------------------------------------
Registration fee                                                       472
- --------------------------------------------------------------------------
Other                                                                3,297
- --------------------------------------------------------------------------
TOTAL EXPENSES                                                   1,132,872
- --------------------------------------------------------------------------
NET INVESTMENT INCOME                                            8,488,244
- --------------------------------------------------------------------------
Net realized loss on investments (Notes 1 and  4)                 (691,661)
- --------------------------------------------------------------------------
Net realized gain on futures (Notes 1 and 4)                        95,575
- --------------------------------------------------------------------------
Net unrealized depreciation of investments during the period    (5,283,264)
- --------------------------------------------------------------------------
NET LOSS ON INVESTMENTS                                         (5,879,350)
- --------------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS            $2,608,894
- --------------------------------------------------------------------------
</TABLE>
The accompanying notes are an integral part of these financial statements.

16

<PAGE>   17

<TABLE>
STATEMENT OF CHANGES IN NET ASSETS

<CAPTION>
                                                                 Six months             Year
                                                                      ended            ended
                                                               September 30         March 31
                                                               -----------------------------
                                                                       1994*            1994
DECREASE IN NET ASSETS
- --------------------------------------------------------------------------------------------
<S>                                                             <C>             <C>
Operations:
- --------------------------------------------------------------------------------------------
Net investment income                                           $  8,488,244    $ 17,122,427
- --------------------------------------------------------------------------------------------
Net realized loss on investments                                    (691,661)     (2,667,449)
- --------------------------------------------------------------------------------------------
Net realized gain on futures                                          95,575           -
- --------------------------------------------------------------------------------------------
Net unrealized depreciation of investments                        (5,283,264)     (3,312,231)
- --------------------------------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS               2,608,894      11,142,747
- --------------------------------------------------------------------------------------------
Distributions to remarketed preferred shareholders
from net investment income                                          (662,040)     (1,078,561)
- --------------------------------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS
APPLICABLE TO COMMON SHAREHOLDERS (EXCLUDING
CUMULATIVE UNDECLARED DIVIDENDS ON REMARKETED
PREFERRED SHARES OF $9,000 AND $6,165, RESPECTIVELY)               1,946,854      10,064,186
- --------------------------------------------------------------------------------------------
Distributions to common shareholders from net
investment income                                                 (7,878,419)    (15,599,309)
- --------------------------------------------------------------------------------------------
Issuance of common shares                                          1,305,317       2,496,418
- --------------------------------------------------------------------------------------------
TOTAL DECREASE IN NET ASSETS                                      (4,626,248)     (3,038,705)

NET ASSETS
- --------------------------------------------------------------------------------------------
Beginning of period                                              238,148,362     241,187,067
- --------------------------------------------------------------------------------------------
END OF PERIOD (including undistributed
net investment income of $272,706
and $324,921, respectively)                                     $233,522,114    $238,148,362
- --------------------------------------------------------------------------------------------
NUMBER OF FUND SHARES
- --------------------------------------------------------------------------------------------
Common shares outstanding at beginning of period                  20,924,115      20,673,143
- --------------------------------------------------------------------------------------------
Common shares issued in connection with
reinvestment of distributions                                        139,618         250,972
- --------------------------------------------------------------------------------------------
Common shares outstanding at end of period                        21,063,733      20,924,115
- --------------------------------------------------------------------------------------------
Remarketed preferred shares at beginning of period                       900             900
- --------------------------------------------------------------------------------------------
Remarketed preferred shares outstanding
at end of period                                                         900             900
- --------------------------------------------------------------------------------------------
<FN>
* Unaudited.
</TABLE>

The accompanying notes are an integral part of these financial statements
17

<PAGE>   18
<TABLE>
FINANCIAL HIGHLIGHTS
(For a share outstanding throughout the period)

<CAPTION>
                                                        SIX MONTHS ENDED
                                                            SEPTEMBER 30
                                                        -------------------------------------------------------------------
                                                                    1994*                  1994                        1993
                                                        -------------------------------------------------------------------
<S>                                                             <C>                    <C>                         <C>
NET ASSET VALUE, BEGINNING OF PERIOD (COMMON SHARES)            $   9.23               $   9.49                    $   8.99
- ---------------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS:
- ---------------------------------------------------------------------------------------------------------------------------
Net investment income                                                .40                    .81                         .86
- ---------------------------------------------------------------------------------------------------------------------------
Net realized and unrealized gain (loss) on investments              (.27)                  (.27)                        .51
- ---------------------------------------------------------------------------------------------------------------------------
TOTAL FROM INVESTMENT OPERATIONS                                     .13                    .54                        1.37
- ---------------------------------------------------------------------------------------------------------------------------
Less distributions
From net investment income:
   to preferred shareholders                                        (.03)                  (.05)                       (.06)
   to common sharholders                                            (.38)                  (.75)                       (.81)
- ---------------------------------------------------------------------------------------------------------------------------
TOTAL DISTRIBUTIONS                                                 (.41)                  (.80)                       (.87) 
- ---------------------------------------------------------------------------------------------------------------------------
Preferred share offering costs                                         -                      -                           - 
- ---------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD (common shares)                  $   8.95               $   9.23                    $   9.49
- ---------------------------------------------------------------------------------------------------------------------------
Market value, end of period (common shares)                     $   9.50               $   9.25                    $  10.50
- ---------------------------------------------------------------------------------------------------------------------------
TOTAL INVESTMENT RETURN AT MARKET VALUE (%) (common shares)(b)      6.90(a)               (4.99)                      15.48
- ---------------------------------------------------------------------------------------------------------------------------
NET ASSETS, END OF PERIOD (total fund) (in thousands)           $233,522               $238,148                    $241,187
- ---------------------------------------------------------------------------------------------------------------------------
Ratio of expenses to average net assets (%) (c)                      .59(a)                1.17                        1.17
- ---------------------------------------------------------------------------------------------------------------------------
Ratio of net investment income to average net assets(%) (c)         4.10(a)                7.97                        8.58 
- ---------------------------------------------------------------------------------------------------------------------------
Portfolio turnover rate (%)                                        18.09                  28.55                       53.89
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


18

<PAGE>   19
<TABLE>
<CAPTION>

                                                                                                        FOR THE PERIOD
                                                                                                          MAY 25, 1989
                                                                                                         (COMMENCEMENT
                                                                                                        OF OPERATIONS)
                                                                  YEAR ENDED MARCH 31                      TO MARCH 31
                                                                  -----------------------------------------------------
                                                                                 1992            1991            1990
                                                                  -----------------------------------------------------
<S>                                                                          <C>             <C>             <C>
NET ASSET VALUE, BEGINNING OF PERIOD (COMMON SHARES)                         $   8.85        $   9.28        $   9.26+
- -----------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS:
- -----------------------------------------------------------------------------------------------------------------------
Net investment income                                                             .84             .78             .66
- -----------------------------------------------------------------------------------------------------------------------
Net realized and unrealized gain (loss) on investments                            .22            (.40)           (.05)
- -----------------------------------------------------------------------------------------------------------------------
TOTAL FROM INVESTMENT OPERATIONS                                                 1.06             .38             .61
- -----------------------------------------------------------------------------------------------------------------------
Less distributions
From net investment income:
    to preferred shareholders                                                    (.06)++            -               -
    to common sharholders                                                        (.81)           (.81)           (.59)
- -----------------------------------------------------------------------------------------------------------------------
TOTAL DISTRIBUTIONS                                                              (.87)           (.81)           (.59)
- -----------------------------------------------------------------------------------------------------------------------
Preferred share offering costs                                                   (.05)              -               -    
- -----------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD (common shares)                               $   8.99        $   8.85        $   9.28
- -----------------------------------------------------------------------------------------------------------------------
Market value, end of period (common shares)                                  $   9.88        $   9.13        $   9.25
- -----------------------------------------------------------------------------------------------------------------------
TOTAL INVESTMENT RETURN AT MARKET VALUE (%) (common shares) (b)                 18.15            7.92           (1.56)(a)
- -----------------------------------------------------------------------------------------------------------------------
NET ASSETS, END OF PERIOD (TOTAL FUND) (in thousands)                        $228,735        $178,871        $186,520
- -----------------------------------------------------------------------------------------------------------------------
Ratio of expenses to average net assets (%) (c)                                  1.13             .90             .70(a)
- -----------------------------------------------------------------------------------------------------------------------
Ratio of net investment income to average net assets (%) (c)                     8.77            8.55            7.08(a)
- -----------------------------------------------------------------------------------------------------------------------
Portfolio turnover rate (%)                                                     62.28           19.69           48.90(a)
- -----------------------------------------------------------------------------------------------------------------------
<FN>
 *    Unaudited.
 +    Represents initial net asset value of $9.30 less offering expenses of approximately $0.04.
 ++   Preferred shares were issued on July 22, 1991.
(a)   Not annualized.
(b)   Total investment return assumes dividend reinvestment and does not reflect the effect of sales charges.
(c)   Ratios reflect net assets available to common shares only; net investment income ratio also reflects reduction
      for dividend payments to preferred shareholders.
</TABLE>

19

<PAGE>   20
NOTES TO FINANCIAL STATEMENTS
September 30, 1994 (Unaudited)



NOTE 1
SIGNIFICANT ACCOUNTING POLICIES

The fund is registered under the Investment Company Act of 1940, as amended, as 
a diversified, closed-end management investment company. The fund's investment  
objective is to seek high current income exempt from federal income tax. The
fund intends to achieve its objective by investing in high yielding tax-exempt
municipal securities constituting a portfolio that the fund's manager, Putnam
Investment management, Inc., ("Putnam Management") a wholly-owned subsidiary of
Putnam Investments, Inc. believes to be consistent with prudent investment
management.

The following is a summary of significant accounting policies consistently
followed by the fund in the preparation of its financial statements. The
policies are in conformity with generally accepted accounting principles.

A SECURITY VALUATION Tax-exempt bonds and notes are stated on the basis of
valuations provided by a pricing service, approved by the Trustees, which uses 
information with respect to transactions in bonds, quotations from bond
dealers, market transactions in comparable securities and various relationships
between securities in determining value. The fair values of restricted
securities are determined by the Manager following procedures approved by the
Trustees, and such valuations and procedures are reviewed periodically by the
Trustees.

B SECURITY TRANSACTIONS AND RELATED INVESTMENT INCOME Security transactions are
accounted for on the trade date (date the order to buy or sell is
executed). Interest income is recorded on the accrual basis.

C FUTURES A futures contract is an agreement between two parties to buy and sell
a security at a set price on a future date. Upon entering into such a contract,
the fund is required to pledge to the broker an amount of cash or securities
equal to the minimum "initial margin" requirements of the exchange. Pursuant to
the contract, the fund agrees to receive from or pay to the broker an amount of
cash equal to the daily fluctuation in value of the contract. Such receipts or
payments are known as "variation margin," and are recorded by the fund as
unrealized gains or losses. When the contract is closed, the fund records a
realized gain or loss equal to the difference between the value of the contract
at the time it was opened and the value at the time it  was closed. The
potential risk to the fund is that the change in value of the underlying
securities may not correspond to the change in value of the futures contracts.

D DETERMINATION OF NET ASSET VALUE Net asset value of the common shares is
determined by dividing the value of all assets of the fund (including

20

<PAGE>   21

accrued interest and dividends), less all liabilities (including accrued
expenses), undeclared dividends on remarketed preferred shares and the  
liquidation value of any outstanding remarketed preferred shares, by the total
number of common shares outstanding.

E FEDERAL TAXES It is the policy of the fund to distribute all of its income
within the prescribed time and otherwise comply with  the provisions of the
Internal  Revenue  Code applicable to regulated  investment companies. It is
also the intention of the fund to distribute an amount sufficient to avoid
imposition of any excise tax under Section 4982 of the Internal Revenue Code of
1986. Therefore, no provision has been made for federal taxes on income, capital
gains or unrealized appreciation of securities held and excise tax on   income
and capital gains.

At March 31, 1994, the fund had a capital loss carryover of approximately
$293,000 available to offset future realized capital gains, if any, to the
extent provided by regulations. Of this amount, $229,000 and $64,000 will expire
March 31, 1999 and 2002, respectively. To the extent that capital loss
carryovers are used to offset realized capital gains, it is unlikely that
gains so offset will be distributed to shareholders since any such distribution
might be taxable as ordinary income.

F DISTRIBUTIONS TO SHAREHOLDERS Distributions to common and preferred
shareholders are recorded by the fund on the ex-dividend date. Dividends on
remarketed preferred shares become payable when, as and if declared by the
Trustees. Each dividend period for the remarketed preferred shares is generally
a 7-day period. The applicable dividend rate for the remarketed preferred
shares on September 30, 1994 was 3.65%.

The amount and character of income and gains to be distributed are determined
in accordance with income tax regulations which may differ from generally 
accepted  accounting  principles. These differences  include realized and
unrealized gains and losses on futures and defaulted interest income.
Reclassifications are made to the fund's capital accounts to reflect income and
gains available for distribution (or available capital loss carryovers) under
income tax regulations.

G AMORTIZATION OF BOND PREMIUM Any premium resulting from the purchase of       
securities in excess of maturity value is amortized on a yield-to- maturity
basis.

H UNAMORTIZED ORGANIZATION EXPENSES Expenses incurred by the fund in    
connection with its organization aggregated $55,380.  These expenses were
amortized on a straight-line basis over a five-year period, which concluded
during the six months ended September 30, 1994.

NOTE 2
REMARKETED PREFERRED SHARES

On July 22, 1991, the fund issued 900 Remarketed Preferred Shares (Series A).
The Series A remarketed preferred shares are redeemable at the option of
the fund on any dividend payment date at a redemption price of $50,000 per
share, plus an amount equal to any dividends accumulated on a daily basis but
unpaid through the redemption date (whether or not 

21

<PAGE>   22


such dividends have been declared) and, in certain circumstances, a call        
premium.

Under the Investment Company Act of 1940, the fund is required to maintain asset
coverage of at least 200% with respect to the remarketed preferred shares as of
the last business day of each month in which any such shares are outstanding.
Additionally, the fund is required to meet more stringent asset coverage
requirements under the terms of the remarketed preferred shares and the shares'
rating agencies. Should these requirements not be met, or should dividends
accrued on the remarketed preferred shares not be paid, the fund may be 
restricted in its ability to declare dividends to common shareholders or may be
required to redeem certain of the remarketed preferred shares. At September 30,
1994, there were no such restrictions on the fund.

NOTE 3
MANAGEMENT FEE, ADMINISTRATIVE SERVICES, AND OTHER TRANSACTIONS

Compensation of Putnam Management for management and investment advisory
services is paid quarterly based on the average net assets of the fund.
Such fee is based on the annual rate of 0.7% of average weekly net assets.

The fund also reimburses the Manager for the compensation and related expenses
of certain officers of the fund and their staff who provide administrative
services to the fund. The aggregate amount of all such  reimbursements is
determined annually by the Trustees. For the six months ended September 30, 1994
the fund paid $5,984 for these services.

Trustees of the fund receive an annual Trustee's fee of $810 and an additional
fee for each Trustees' meeting attended. Trustees who are not interested persons
of the Manager and who serve on committees of the Trustees receive additional
fees for attendance at certain committee meetings. Custodial functions for the
fund's assets are provided by Putnam Fiduciary Trust Company (PFTC), a
subsidiary of Putnam Investments, Inc. Investor servicing agent functions are
provided by Putnam  Investor Services, a division of PFTC. Fees paid for
these investor servicing and custodial functions for the six months ended
September 30, 1994 amounted to $111,397.

Investor servicing and custodian fees reported in the Statement of operations
for the six months ended September 30, 1994 have been reduced by credits
allowed by PFTC.

NOTE 4
PURCHASES AND SALES OF SECURITIES

During the six months ended September 30, 1994, purchases and sales of  
investment  securities  other  than  short-term  investments aggregated 
$43,541,114 and $41,129,524, respectively. Purchases and sales of short-term
municipal obligations aggregated 

22
<PAGE>   23

$21,100,000 and $24,250,000, respectively. In determining the net gain or loss
on securities sold, the cost of securities has been determined on the
identified cost basis. Transactions  in futures contracts during the  period 
are summarized as follows:


<TABLE>
SALES OF FUTURES CONTRACTS
- ------------------------------------------------------
<CAPTION>
                       NUMBER OF           AGGREGATE
                       CONTRACTS          FACE VALUE
- ------------------------------------------------------
<S>                      <C>                 <C>
Contracts opened          150            $ 14,962,500
Contracts closed         (100)            (10,009,375)
- ------------------------------------------------------
OPEN AT END OF PERIOD      50            $  4,953,125
- ------------------------------------------------------
</TABLE>

23

<PAGE>   24

<TABLE>
SELECTED QUARTERLY DATA
(Unaudited)

<CAPTION>
                                                                                 THREE MONTHS ENDED
                                        SEPTEMBER 30        JUNE 30         MARCH 31     DECEMBER 31    SEPTEMBER 30            
- --------------------------------------------------------------------------------------------------------------------
                                                                                1994
- --------------------------------------------------------------------------------------------------------------------
<S>                                     <C>             <C>             <C>             <C>             <C>
TOTAL INVESTMENT INCOME
Total                                   $  4,820,132    $  4,800,984    $  4,849,865    $  5,209,897    $  4,924,600 
Per share*                              $        .22    $        .23    $        .22    $        .26    $        .23
- --------------------------------------------------------------------------------------------------------------------
NET INVESTMENT INCOME AVAILABLE
TO COMMON SHAREHOLDERS
Total                                   $  3,908,019    $  3,918,185    $  4,024,772    $  4,322,207    $  4,056,742           
Per share*                              $        .18    $        .18    $        .18    $        .21    $        .19
- --------------------------------------------------------------------------------------------------------------------
NET REALIZED AND UNREALIZED GAIN
(LOSS) ON INVESTMENTS
Total                                   $ (1,792,719)   $ (4,086,631)   $(11,569,251)   $ (1,686,445)   $  3,798,438
Per share*                              $       (.08)   $       (.19)   $       (.54)   $       (.08)   $        .18
- --------------------------------------------------------------------------------------------------------------------
NET INCREASE (DECREASE) IN
NET ASSETS AVAILABLE TO COMMON
SHAREHOLDERS RESULTING FROM
OPERATIONS
Total                                   $  2,115,300    $   (168,446)   $ (7,544,479)   $  2,635,762    $  7,855,180
Per share*                              $        .10    $       (.01)   $       (.36)   $        .12    $        .38
- --------------------------------------------------------------------------------------------------------------------
NET ASSETS AVAILABLE TO COMMON
SHAREHOLDERS AT END OF PERIOD
Total                                   $188,513,114    $189,691,675    $193,142,197    $203,952,500    $204,589,727   
Per share*                              $       8.95    $       9.04    $       9.23    $       9.78    $       9.84
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

24

<PAGE>   25

<TABLE>
<CAPTION>
                                            JUNE 30         MARCH 31     DECEMBER 31    SEPTEMBER 30        JUNE 30
- --------------------------------------------------------------------------------------------------------------------
                                                                1993                                            1992
- --------------------------------------------------------------------------------------------------------------------
<S>                                     <C>             <C>             <C>             <C>             <C>
TOTAL INVESTMENT INCOME
Total                                   $  4,489,459    $  4,964,013    $  4,957,169    $  5,034,710    $  4,971,251
Per share*                              $        .22    $        .24    $        .24    $        .25    $        .24
- --------------------------------------------------------------------------------------------------------------------
NET INVESTMENT INCOME AVAILABLE
TO COMMON SHAREHOLDERS
Total                                   $  3,640,145    $   4,113,19    $  4,063,674    $  4,184,292    $  4,003,243
Per share*                              $        .18    $        .20    $        .20    $        .21    $        .19
- --------------------------------------------------------------------------------------------------------------------
NET REALIZED AND UNREALIZED GAIN
(LOSS) ON INVESTMENTS
Total                                   $  3,477,578    $  3,361,672    $    592,883    $  3,052,467    $  3,340,306
Per share*                              $        .17    $        .16    $        .03    $        .15    $        .17
- --------------------------------------------------------------------------------------------------------------------
NET INCREASE (DECREASE) IN
NET ASSETS AVAILABLE TO COMMON
SHAREHOLDERS RESULTING FROM
OPERATIONS
Total                                   $  7,117,723    $  7,474,864    $  4,656,557    $  7,236,759    $  7,433,549
Per share*                              $        .35    $        .36    $        .23    $        .36    $        .36
- --------------------------------------------------------------------------------------------------------------------
NET ASSETS AVAILABLE TO COMMON
SHAREHOLDERS AT END OF PERIOD
Total                                   $200,026,144    $196,187,067    $192,274,787    $191,224,748    $187,582,781
Per share*                              $       9.65    $       9.49    $       9.33    $       9.30    $       9.15
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

        *  Per common share.

25

<PAGE>   26

<TABLE>

FUND INFORMATION

<S>                                             <C>
INVESTMENT MANAGER                              OFFICERS                         
Putnam Investment Management, Inc.              George Putnam                    
One Post Office Square                          President                        
Boston, MA 02109                                
                                                Charles E. Porter                
MARKETING SERVICES                              Executive Vice President         
Putnam Mutual Funds Corp.                       
One Post Office Square                          Patricia C. Flaherty              
Boston, MA 02109                                Senior Vice President            
                                                
CUSTODIAN                                       John R. Verani                   
Putnam Fiduciary Trust Company                  Vice President                   
                                                
LEGAL COUNSEL                                   Lawrence J. Lasser
Ropes & Gray                                    Vice President                                 
                                                
TRUSTEES                                        Gordon H. Silver
George Putnam, Chairman                         Vice President                                 
                                                
William F. Pounds, Vice Chairman                Gary N. Coburn
                                                Vice President                                 
Jameson Adkins Baxter                           
                                                James Erickson
Hans H. Estin                                   Vice President                          
                                                
John A. Hill                                    Triet Nguyen
                                                Vice President and Fund Manager                          
Elizabeth T. Kennan                             
                                                William N. Shiebler
Lawrence J. Lasser                              Vice President                                 
                                                
Robert E. Patterson                             Paul M. O'Neil       
                                                Vice President                                         
Donald S. Perkins                               
                                                John D. Hughes
George Putnam, III                              Vice President and Treasurer                         
                                                
A.J.C. Smith                                    Beverly Marcus                                 
                                                Clerk and Assistant Treasurer
W. Nicholas Thorndike                           



</TABLE>


26
<PAGE>   27








Call 1-800-225-1581 weekdays from 9 a.m. to 5 p.m. Eastern Time
for up-to-date information about the fund's NAV or to request
Putnam's quarterly Closed-End Fund Commentary.

27
<PAGE>   28

                                                                --------------
PUTNAM INVESTMENTS                                              BULK RATE
                                                                U.S. POSTAGE
THE PUTNAM FUNDS                                                PAID
One Post Office Square                                          PUTNAM
Boston, Massachusetts 02109                                     INVESTMENTS
                                                                --------------







014/324-14803 


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