PUTNAM AMERICAN GOVERNMENT INCOME FUND
N-30D, 1996-05-28
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Putnam
American
Government
Income Fund

SEMIANNUAL REPORT
March 31, 1996

[LOGO: BOSTON * LONDON * TOKYO]



Fund highlights

* "[Putnam American Government Income Fund] just capped off its best
   [calendar] year ever, on both an absolute and a relative basis.
   Manager Mike Martino earned this outperformance in the standard 
   manner, by simply taking on a longer duration (i.e., more interest-
   rate risk) than most of the fund's peers. He did so in part by 
   keeping the bulk of assets in Treasuries, reducing the fund's stake
   in the prepayment-vulnerable mortgage sector to just 25% from August
   through October [1995]."
     
                             -- Morningstar Mutual Funds, March 1, 1996

*  For the year ended March 31, 1996, Putnam American Government Income
   Fund's class A, class M, and class B shares were ranked 19, 24, and
   36, respectively, out of 173 general U.S. government funds tracked by
   Lipper Analytical Services. These rankings placed all three share 
   classes within the top 21% of all general U.S. government funds 
   rated, and in the case of class A shares, placed them in the top 
   11%.*

       CONTENTS
 4     Report from Putnam Management
 8     Fund performance summary
11     Portfolio holdings
13     Financial statements

*Lipper is an independent mutual fund research organization. Its 
rankings are based on total return performance, vary over time, and do 
not reflect the effects of sales charges. The fund's class A shares were 
ranked 61 out of 70 and 32 out of 36 general U.S. government funds for 
5- and 10-year performance, respectively, through 3/31/96. Class B and 
class M shares were not ranked over longer applicable periods. Past 
performance is not indicative of future results.



[GRAPHIC OMMITTED: photo of George Putnam]

(copyright) Karsh, Ottawa

From the Chairman


Dear Shareholder:

For most of the first half of Putnam American Government Income Fund's 
current fiscal year -- the six months ended March 31, 1996 -- bonds 
enjoyed one of the most vibrant markets in recent memory, only to turn 
abruptly downward toward the end of the period. Interest rates rose 
markedly, causing losses in most sectors of the market. 

The bond market, which characteristically retreats in anticipation of 
bad inflation news, was reacting to concern over the possibility of 
rising prices resulting from an accelerating economy. Foreseeing such 
volatility, Fund Manager Michael Martino shifted to securities with 
shorter durations to limit exposure to those sectors hit hardest by the 
downturn. As the period came to a close, Mike was preparing to tilt your 
fund's portfolio allocation more heavily toward mortgage-backed 
securities in order to take advantage of higher interest rates.

Mike believes the market environment may remain somewhat unsettled over 
the next few months. He provides a full discussion of your fund's 
performance and outlook in the report that follows.

Respectfully yours, 


/S/George Putnam
George Putnam

Chairman of the Trustees

May 15, 1996



Report from the Fund Manager
Michael Martino


The first six months of Putnam American Government Income Fund's 1996 
fiscal year, the six months ended on March 31, spanned a sharply changing 
environment in the fixed-income markets. Through the first three months 
of the period, the bond market continued the strong performance that 
capped off a successful calendar 1995. Signs of weakness began to appear 
during January and February, however, culminating in a substantial 
selloff on March 8 in the wake of February's stronger-than-expected 
employment figures. 

The convincing employment report led investors to conclude that the 
Federal Reserve Board would be unlikely to reduce short-term interest 
rates again any time in the near future. Moreover, in the often contrary 
logic of the bond markets, investors frequently react negatively to 
indications of economic strength out of fear that inflation could re-
emerge, which would erode the value of investments with fixed income 
streams. Despite these market dislocations, your fund posted respectable 
results for the period, while continuing to focus on strategies for 
seeking high current income. (Please refer to the tables on pages 8 and 
9 for complete performance information.) 

* ACTIVE MANAGEMENT OF INTEREST-RATE EXPOSURE WAS KEY TO PERIOD'S 
  RESULTS

Perhaps the key determinant of your fund's performance over the period 
was active management of the portfolio's duration. Duration is the 
principal measure of interest-rate sensitivity for a given portfolio of 
bonds. The longer the duration, the more sensitive a portfolio is to a 
given change in rates. When rates are falling, as was the case during 
the first three months of the period, bond prices rise, and a relatively 
long duration enables the fund to capture a greater portion of that 
price appreciation. Accordingly, we maintained a duration of 
approximately six years over the first three months of the period. 

When interest rates rise, however, a long duration has the opposite 
effect, causing the portfolio's value to decline more rapidly for a 
given change in rates. Beginning in mid-January, rates started moving 
higher amid growing concern about an accelerating economy, potential 
inflationary pressures, and disappointment over the lack of progress in 
federal budget negotiations. Fortunately, we had shortened duration to 
5.75 years by the beginning of January. We continued to trim duration 
through the March market decline, bringing it to 4.4 years by March 31. 
Although this strategy did not fully insulate the fund from the market's 
downturn, shortening duration in a timely fashion did provide some 
shelter for the portfolio when rates began their ascent. 

* U.S. TREASURY HOLDINGS BOOST EARLY-PERIOD PERFORMANCE

Given that calendar 1995's bond rally was led by U.S. Treasury 
securities, your fund's allocation to Treasuries, which ranged from 46% 
of the portfolio at the beginning of the semiannual period to 56% at the 
end, generally bolstered performance, especially early in the fiscal 
period.

[GRAPHIC OMITTED: horizontal bar chart EFFECTIVE MATURITY BREAKDONW 
(3/31/96)
showing:

0-1         8.7%
1-5        34.7% 
5-10       41.7%
10-15       4.3%
15+        10.6%

This chart illustrates the distribution of effective bond maturities in 
the portfolio. The fund's emphasis on controlling exposure to interest-
rate fluctuations is demonstrated by the fact that, at the end of the 
fiscal period, over 76% of the fund's assets were concentrated in bonds 
with effective maturities between 1 and 10 years. Percentages are of 
total market value of assets as of 3/31/96. Effective maturity is 
derived from calculations that incorporate assumptions about prepayment 
rates and cash flows of mortgage-backed securities. Measures of 
effective maturity and the assumptions on which they are based will vary 
over time.]



During the second half of the period, we shifted away from our strategy 
of concentrating holdings in shorter-term Treasuries (those with 
maturities of three to five years). Such a maturity structure tends to 
perform best when the Fed is actively reducing short-term rates. Since 
the expectation of further Fed easing waned late in the period, we 
believed this positioning was unlikely to perform satisfactorily going 
forward. 

Consequently, by the end of the period, we had spread the fund's 
Treasury holdings somewhat more evenly across the maturity spectrum. 
Moreover, in keeping with our close monitoring of the fund's interest-
rate sensitivity, we reduced the average effective maturity of the 
overall portfolio from approximately 15 years on September 30 to just 
over 7 years on March 31. 

Consistent with our normal approach, we kept a significant portion of 
the fund's portfolio invested in Ginnie Maes* throughout the period. 
Ginnie Maes are mortgage-backed securities that typically provide a 
higher yield than Treasuries of comparable maturity but generally 
underperform Treasuries in periods of rising or falling rates. 

All told, while we adjusted the fund's weightings to capitalize on the 
market sector that we believed offered the best opportunities, we 
balanced these efforts with an unrelenting focus on managing interest-
rate risk as much as possible. 

* GINNIE MAES FAVORED IN THE FACE OF MARKET UNCERTAINTY

While we cannot provide assurances, we believe it's likely the bond 
market may move within a narrow range over the next few months. Further 
signs of economic strength, Treasury note auctions that will continue 
into May, and rising commodity prices -- oil being the most visible -- 
may put pressure on the market over the near term. 

Based on this outlook, our current plan calls for favoring mortgage-
backed securities over Treasuries. Mortgage-backed securities typically 
outperform Treasuries of similar maturities in periods when market 
volatility is relatively low. And while we can't make predictions about 
the level of fluctuation in the market, we still believe mortgages are 
likely to perform well simply because they yield more than Treasuries.+ 
Accordingly, we are currently targeting an increase to upward of 45% of 
the portfolio in mortgage securities, with Ginnie Maes representing the 
bulk of the allocation.

*Bonds issued by the Government National Mortgage Association. 



[GRAPHIC OMMITTED: vertical bar chart COMPARATIVE PORTFOLIO ALLOCATION*
showing:

U.S. Treasury securities
3/31/95                  67.1%
9/30/95                  46.1%
3/31/96                  56.0%

Mortgage-backed securities
3/31/95                  27.6%
9/30/95                  49.8%
3/31/96                  34.1%

Cash and short-term investments
3/31/95                   5.3%
9/30/95                   6.9%
3/31/96                   9.1%

*Based on net assets as of the indicated date. Allocations will vary 
over time.]


In general, we expect to maintain a slightly defensive approach to the 
market until the economy's direction and interest-rate trends become 
clearer. This will likely entail keeping duration near the U.S. 
government fund group average -- that is, neither more aggressively nor 
more conservatively positioned relative to similar funds -- while 
increasing the weighting in Ginnie Maes for their yield advantages. 
 
+It is important to remember, however, that mortgage-backed securities 
are subject to prepayment risk, which is the risk that an investor's 
principal will be returned in full at some point prior to the security's 
stated maturity date. Such prepayment may cause an investor's actual 
rate of return to differ from the expected rate of return.

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 3/31/96, there is no guarantee the fund will 
continue to hold these securities in the future. 



Performance summary

Performance should always be considered in light of a fund's investment 
strategy. Putnam American Government Income Fund is designed for 
investors seeking high current income primarily through U.S. government 
securities.

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 in the fund.

TOTAL RETURN FOR PERIODS ENDED 3/31/96
                          Class A           Class B         Class M
 (inception date)          3/1/85           5/20/94         2/14/95
                        NAV      POP     NAV     CDSC     NAV      POP
- -----------------------------------------------------------------------
6 months               2.13%   -2.71%   1.66%   -3.27%   1.87%    -1.43%
- -----------------------------------------------------------------------
1 year                11.14     5.87   10.27     5.27   10.77      7.13
- -----------------------------------------------------------------------
5 years               34.77    28.37      --       --      --        --
Annual average         6.15     5.12      --       --      --        --
- -----------------------------------------------------------------------
10 years              86.70    77.82      --       --      --        --
Annual average         6.44     5.92      --       --      --        --
- -----------------------------------------------------------------------
Life of class B          --       --   13.58     9.58      --        --
Annual average           --       --    7.01     4.99      --        --
- -----------------------------------------------------------------------
Life of class M          --       --      --       --   13.53      9.88
Annual average           --       --      --       --   11.56      8.47
- -----------------------------------------------------------------------

COMPARATIVE INDEX RETURNS FOR PERIODS ENDED 3/31/96
                               Lehman Bros.
                               Intermediate        Consumer
                              Treasury Index     Price Index
- ----------------------------------------------------------------
6 months                            2.64%           1.63%
- ----------------------------------------------------------------
1 year                              9.10            2.84
- ----------------------------------------------------------------
5 years                            44.28           15.33
Annual average                      7.61            2.89
- ----------------------------------------------------------------
10 years                          113.69           43.11
Annual average                      7.89            3.65
- ----------------------------------------------------------------
Life of class B                    14.37            5.63
Annual average                      7.60            2.96
- ----------------------------------------------------------------
Life of class M                    11.79            3.59
Annual average                     10.03            3.09
- ----------------------------------------------------------------

Performance data represent past results, do not reflect future 
performance, and will differ for each share class. They do not take into 
account any adjustment for taxes payable on reinvested distributions. 
Investment returns and net asset value will fluctuate so that an 
investor's shares, when sold, may be worth more or less than their 
original cost. POP assumes 4.75% maximum sales charge for class A shares 
and 3.25% for class M shares. CDSC for class B shares assumes the 
applicable sales charge, with the maximum being 5%. 

PRICE AND DISTRIBUTION INFORMATION
6 months ended 3/31/96
                                   Class A     Class B     Class M
- -----------------------------------------------------------------------
Distributions (number)                   6           6           6
- -----------------------------------------------------------------------
Income                              $0.296      $0.265      $0.284
- -----------------------------------------------------------------------
Total                               $0.296      $0.265     $0.284
- -----------------------------------------------------------------------
Share value:                      NAV   POP      NAV      NAV      POP
- -----------------------------------------------------------------------
9/30/95                          $8.65  $9.08   $8.62    $8.65    $8.94
- -----------------------------------------------------------------------
3/31/96                           8.54   8.97    8.50     8.53     8.82
- -----------------------------------------------------------------------
Current return
- -----------------------------------------------------------------------
(End of period)
- -----------------------------------------------------------------------
Current dividend rate1            6.74%  6.42%   5.93%    6.47%   6.26%
- -----------------------------------------------------------------------
Current 30-day SEC yield2         6.29   5.98    5.55     6.04     5.84
- -----------------------------------------------------------------------

1  Income portion of most recent distribution, annualized and divided by 
   NAV or POP at end of period.
2  Based on investment income, calculated using SEC guidelines.


TERMS AND DEFINITIONS

Class A shares are generally subject to an initial sales charge. 

Class B shares may be subject to a sales charge upon redemption.

Class M shares have a lower initial sales charge and a higher 12b-1 fee 
than class A shares and no sales charge on redemption.

Net asset value (NAV) is the value of all your fund's assets, minus any 
liabilities, divided by the number of outstanding shares, not including 
any initial or contingent deferred sales charge. 

Public offering price (POP) is the price of a mutual fund share plus the 
maximum sales charge levied at the time of purchase. POP performance 
figures shown here assume the maximum 4.75% sales charge for class A 
shares and 3.25% for class M shares.

Contingent deferred sales charge (CDSC) is a charge applied at the time 
of the redemption of class B shares and assumes redemption at the end of 
the period. Your fund's CDSC declines from a 5% maximum during the first 
year to 1% during the sixth year. After the sixth year, the CDSC no 
longer applies.

COMPARATIVE BENCHMARKS

Lehman Brothers Intermediate Treasury Index is an unmanaged list of 
Treasury bonds; it is used as a general gauge of the market for 
intermediate-term fixed-income securities. The index does not take into 
account brokerage commissions or other costs, may include bonds 
different from those in the fund, and may pose different risks than the 
fund. Securities indexes assume reinvestment of all distributions and 
interest payments, and the performance of the fund will differ.

Consumer Price Index (CPI) is a commonly used measure of inflation; it 
does not represent an investment return.



<TABLE>
<CAPTION>

Portfolio of investments owned
March 31, 1996 (Unaudited)

U.S. GOVERNMENT AND AGENCY OBLIGATIONS (90.1%)*
PRINCIPAL AMOUNT                                                                                 VALUE
<S>         <C>           <C>                                                            <C>
Collaterized Mortgage Obligations (0.4%)
- ------------------------------------------------------------------------------------------------------
                           Federal National Mortgage Association
              $7,500,000   Ser. 89-23, Class D, 10.2s, September 25, 2018                   $7,804,688
                 160,758   Principal Only (PO) Strips, Ser. 93-152, Class A,
                           zero %, February 25, 2017 [DOUBLE SECTION MARKER]                   160,758
                                                                                        --------------
                                                                                             7,965,446

U.S. Agency Mortgage Pass-Throughs (33.7%)
- ------------------------------------------------------------------------------------------------------
                           Federal National Mortgage Association
              49,079,008   7s, Dwarfs, with various due dates from
                           May 1, 2009 to February 1, 2011                                  48,971,525
              49,219,079   6 1/2s, Dwarfs, with various due dates from
                           July 1, 2010 to February 1, 2011                                 48,142,167
                           Government  National Mortgage Association
              77,920,772   9s, with various due dates from
                           November 15, 2008 to July 1, 2024                                83,731,197
              14,969,687   8 1/2s,  with various due dates from
                           August 15, 2019 to September 15, 2024                            15,799,908
              69,584,918   8s, with various due dates from
                           August 15, 2006 to May 15, 2023                                  71,681,840
             178,237,569   7 1/2s, with various due dates from
                           February 15, 2022 to September 15, 2025                         178,143,615
             246,415,227   7s, with various due dates from
                           April 15, 2023 to January 15, 2026                              240,023,209
                                                                                        --------------
                                                                                           686,493,461
U.S. Treasury Obligations (56.0%)
- ------------------------------------------------------------------------------------------------------
                           U.S. Treasury Bonds
             100,000,000   12s, August 15, 2013                                            144,359,000
              50,000,000   9 7/8s, November 15, 2015                                        66,320,500
              75,000,000   8 3/4s, November 15, 2008                                        85,195,500
                           U.S. Treasury Notes
              50,000,000   9 1/8s, May 15, 1999                                             54,390,500
             100,000,000   7 3/4s, February 15, 2001                                       106,859,000
              50,000,000   7 1/2s, February 15, 2005                                        53,656,000
              50,000,000   7 1/2s, May 15, 2002                                             53,258,000
             100,000,000   7 1/2s, October 31, 1999                                        104,656,000
             100,000,000   6 1/8s, September 30, 2000                                      100,016,000
              35,000,000   5 3/4s, October 31, 2000                                         34,491,450
             100,000,000   5 5/8s, February 15, 2006                                        94,844,000
             100,000,000   5 1/4s, January 31, 2001                                         96,562,000
              50,000,000   5 1/8s, February 28, 1998                                        49,422,000
             100,000,000   5s, February 15, 1999                                            97,656,000
                                                                                        --------------
                                                                                         1,141,685,950
                           Total U. S. Government and Agency Obligations
                           (cost $1,848,543,506)                                        $1,836,144,857
             

SHORT TERM INVESTMENTS (9.1%)*
PRINCIPAL AMOUNT                                                                                 VALUE
             
             $20,000,000   Federal Home Loan Bank, effective yield of 5.1%,
                           September 6, 1996                                               $19,549,500
              80,637,000   Interest in $844,579,000 joint repurchase agreement
                           dated March 29, 1996 with Morgan (J.P.) & Co., Inc.
                           due April 1, 1996 with respect to various U.S.
                           Treasury obligations--maturity value of
                           $80,745,860 for an effective yield of 5.4%                       80,673,287
              85,000,000   Interest in $750,000,000 joint repurchase agreement
                           dated March 29, 1996 with Goldman, Sachs & Co.,
                           due April 1, 1996 with respect to various U.S.
                           Treasury obligations--maturity value of
                           $85,113,687 for an effective yield of 5.35%                      85,037,896
                                                                                        --------------
                           Total Short-Term Investments
                           (cost $185,260,683)                                            $185,260,683
                                                                                        --------------
                           Total Investments (cost $2,033,804,189) ***                  $2,021,405,540
- ------------------------------------------------------------------------------------------------------
*         Percentages indicated are based on net assets of $2,037,748,697.
***       The aggregate identified cost on a tax basis is $2,033,804,189, resulting in gross unrealized 
          appreciation and depreciation of $54,526,251 and $66,924,900, respectively, or net unrealized 
          depreciation of $12,398,649.
[DOUBLE 
SECTION 
MARKER]   Principal Only (PO) Strips represent the right to receive the monthly principal payments on an 
          underlying pool of mortgage loans.  No payments of interest on the pool are passed through to 
          the PO holders.

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

</TABLE>



<TABLE>
<CAPTION>

Statement of assets and liabilities
March 31,1996 (Unaudited)

<S>                                                             <C>
Assets
- ------------------------------------------------------------------------------
Investments in securities, at value
(identified cost $2,033,804,189)  (Note 1)                      $2,021,405,540
- ------------------------------------------------------------------------------
Cash                                                                       650
- ------------------------------------------------------------------------------
Interest receivable                                                 24,303,214
- ------------------------------------------------------------------------------
Receivable for shares of the fund sold                                 392,410
- ------------------------------------------------------------------------------
Receivable for securities sold                                          28,757
- ------------------------------------------------------------------------------
Total assets                                                     2,046,130,571

Liabilities
- ------------------------------------------------------------------------------
Payable for shares of the fund repurchased                           2,995,832
- ------------------------------------------------------------------------------
Payable for compensation of Manager (Note 2)                         2,692,084
- ------------------------------------------------------------------------------
Payable for investor servicing and custodian fees (Note 2)             437,484
- ------------------------------------------------------------------------------
Payable for compensation of Trustees (Note 2)                            3,869
- ------------------------------------------------------------------------------
Payable for administrative services (Note 2)                             6,897
- ------------------------------------------------------------------------------
Payable for distribution fees (Note 2)                               1,327,246
- ------------------------------------------------------------------------------
Other accrued expenses                                                 918,462
- ------------------------------------------------------------------------------
Total liabilities                                                    8,381,874
- ------------------------------------------------------------------------------
Net assets                                                      $2,037,748,697

Represented by
- ------------------------------------------------------------------------------
Paid-in-capital (Notes 1 and 4)                                 $3,484,468,331
- ------------------------------------------------------------------------------
Distributions in excess of net investment income (Note 1)           (8,756,837)
- ------------------------------------------------------------------------------
Accumulated net realized loss on investments
(Note 1)                                                        (1,425,564,148)
- ------------------------------------------------------------------------------
Net unrealized depreciation of investments                         (12,398,649)
- ------------------------------------------------------------------------------
Total -- Representing net assets applicable to
capital shares outstanding                                      $2,037,748,697

Computation of net asset value and offering price
- ------------------------------------------------------------------------------
Net asset value and redemption price per class A share
($2,019,847,217 divided by 236,524,440 shares)                           $8.54
- ------------------------------------------------------------------------------
Offering price per class A share (100/95.25 of $8.54)*                   $8.97
- ------------------------------------------------------------------------------
Net asset value and offering price per class B share
($17,081,700 divided by 2,009,150 shares)**                              $8.50
- ------------------------------------------------------------------------------
Net asset value and redemption price per class M share
($819,780 divided by 96,070 shares)                                      $8.53
- ------------------------------------------------------------------------------
Offering price per class M share (100/96.75 of $8.53)*                   $8.82
- ------------------------------------------------------------------------------

*  On single retail sales of less than $50,000. On sales of $50,000 or more and 
   on group sales the offering price is reduced.
** Redemption price per share is equal to net asset value less any applicable 
   contingent deferred sales charge.

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

</TABLE>



<TABLE>
<CAPTION>

Statement of operations
Six months ended March 31,1996 (Unaudited)

<S>                                                                <C>
Interest income:                                                   $74,202,559
- ------------------------------------------------------------------------------
Expenses:
- ------------------------------------------------------------------------------
Compensation of Manager (Note 2)                                     5,487,690
- ------------------------------------------------------------------------------
Investor servicing and custodian fees (Note 2)                       1,694,753
- ------------------------------------------------------------------------------
Compensation of Trustees (Note 2)                                       31,637
- ------------------------------------------------------------------------------
Administrative services (Note 2)                                        13,248
- ------------------------------------------------------------------------------
Distribution fees -- Class A (Note 2)                                2,687,073
- ------------------------------------------------------------------------------
Distribution fees -- Class B (Note 2)                                   67,293
- ------------------------------------------------------------------------------
Distribution fees -- Class M (Note 2)                                    1,856
- ------------------------------------------------------------------------------
Reports to shareholders                                                 51,095
- ------------------------------------------------------------------------------
Registration fees                                                          225
- ------------------------------------------------------------------------------
Auditing                                                                20,270
- ------------------------------------------------------------------------------
Legal                                                                   16,538
- ------------------------------------------------------------------------------
Postage                                                                273,161
- ------------------------------------------------------------------------------
Other                                                                   77,004
- ------------------------------------------------------------------------------
Total expenses                                                      10,421,843
- ------------------------------------------------------------------------------
Expense reduction (Note 2)                                            (604,735)
- ------------------------------------------------------------------------------
Net expenses                                                         9,817,108
- ------------------------------------------------------------------------------
Net investment income                                               64,385,451
- ------------------------------------------------------------------------------
Net realized gain on investments (Notes 1 and 3)                    53,645,086
- ------------------------------------------------------------------------------
Net unrealized depreciation on investments during the period       (70,732,375)
- ------------------------------------------------------------------------------
Net loss on investments                                            (17,087,289)
- ------------------------------------------------------------------------------
Net increase in net assets resulting from operations               $47,298,162
- ------------------------------------------------------------------------------

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

</TABLE>



<TABLE>
<CAPTION>

Statement of changes in net assets
- ------------------------------------------------------------------------------------------------
                                                              Six months ended        Year ended
                                                                      March 31      September 30
                                                                          1996*             1995
- ------------------------------------------------------------------------------------------------
<S>                                                               <C>              <C>
Decrease in net assets
- ------------------------------------------------------------------------------------------------
Operations:
- ------------------------------------------------------------------------------------------------
Net investment income                                              $64,385,451      $148,626,707
- ------------------------------------------------------------------------------------------------
Net realized gain (loss) on investments                             53,645,086       (16,549,652)
- ------------------------------------------------------------------------------------------------
Net unrealized appreciation (depreciation) of investments          (70,732,375)      147,624,755
- ------------------------------------------------------------------------------------------------
Net increase in net assets resulting from operations                47,298,162       279,701,810
- ------------------------------------------------------------------------------------------------
Distributions to shareholders
- ------------------------------------------------------------------------------------------------
From net investment income: - 
     Class A                                                       (72,725,222)     (151,762,165)
- ------------------------------------------------------------------------------------------------
     Class B                                                          (393,822)         (283,676)
- ------------------------------------------------------------------------------------------------
     Class M                                                           (23,244)          (11,822)
- ------------------------------------------------------------------------------------------------
From net realized gain on investments:
     Class A                                                                --       (13,778,422)
- ------------------------------------------------------------------------------------------------
     Class B                                                                --           (25,755)
- ------------------------------------------------------------------------------------------------
     Class M                                                                --            (1,073)
- ------------------------------------------------------------------------------------------------
Decrease from capital share transactions (Note 4)                 (129,943,301)     (338,147,532)
- ------------------------------------------------------------------------------------------------
Total decrease in net assets                                      (155,787,427)     (224,308,635)
- ------------------------------------------------------------------------------------------------
Net assets
- ------------------------------------------------------------------------------------------------
Beginning of period                                              2,193,536,124     2,417,844,759
- ------------------------------------------------------------------------------------------------
End of period (including distributions in excess of net
  investment income of $8,756,837 and $0,
  respectively)                                                 $2,037,748,697    $2,193,536,124
- ------------------------------------------------------------------------------------------------
* Unaudited.

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

</TABLE>



<TABLE>
<CAPTION>

Financial highlights
(For a share outstanding throughout the period)

                                                                  February 14, 
                                                                         1995
                                                  Six months    (commencement  Six months
                                                    ended of   of operations)      ended      Year ended
                                                    March 31  to September 30    March 31    September 30
- --------------------------------------------------------------------------------------------------------
                                                        1996*           1995**      1996*           1995**
- --------------------------------------------------------------------------------------------------------
                                                             Class M                             Class B
- --------------------------------------------------------------------------------------------------------
<S>                                                   <C>            <C>         <C>             <C>
Net asset value, beginning of period                   $8.65           $8.14       $8.62           $8.19
- --------------------------------------------------------------------------------------------------------
Investment operations
- --------------------------------------------------------------------------------------------------------
Net investment income                                    .26             .29         .24             .46
- --------------------------------------------------------------------------------------------------------
Net realized and unrealized gain (loss)
on investments                                          (.10)            .62        (.09)            .51
- --------------------------------------------------------------------------------------------------------
Total from investment operations                         .16             .91         .15             .97
- --------------------------------------------------------------------------------------------------------
Distributions to shareholders:
- --------------------------------------------------------------------------------------------------------
From net investment income                              (.28)           (.37)       (.27)          (.49)
- --------------------------------------------------------------------------------------------------------
From net realized gain on investments                     --              --          --              --
- --------------------------------------------------------------------------------------------------------
From return of capital                                    --            (.03)         --            (.05)
- --------------------------------------------------------------------------------------------------------
Total distributions                                     (.28)           (.40)       (.27)           (.54)
- --------------------------------------------------------------------------------------------------------
Net asset value, end of period                         $8.53           $8.65       $8.50           $8.62
- --------------------------------------------------------------------------------------------------------
Total investment return at net 
asset value  (%) (a)                                    1.87(b)        11.44(b)     1.66(b)        12.32
- --------------------------------------------------------------------------------------------------------
Net assets, end of period  (in thousands)               $820            $672     $17,082          $9,099
- --------------------------------------------------------------------------------------------------------
Ratio of expenses to average net assets (%)(c)           .61(b)          .78(b)      .86(b)         1.68
- --------------------------------------------------------------------------------------------------------
Ratio of net investment income to
average net assets (%)                                  2.86(b)         4.03(b)     2.62(b)         5.76
- --------------------------------------------------------------------------------------------------------
Portfolio turnover (%)                                145.21(b)       468.86      145.21(b)       468.86
- --------------------------------------------------------------------------------------------------------



<CAPTION>

Financial highlights (Continued)
(For a share outstanding throughout the period)

                                                     May 20, 
                                                       1994
                                              (commencement     Six months
                                              of operations)         ended
                                            to September 30       March 31   Year ended September 30
- ----------------------------------------------------------------------------------------------------
                                                       1994**         1996*          1995       1994
- ----------------------------------------------------------------------------------------------------
                                                         Class A
- ----------------------------------------------------------------------------------------------------
<S>                                                  <C>            <C>           <C>        <C>
Net asset value, beginning of period                  $8.43          $8.65          $8.21      $9.21
- ----------------------------------------------------------------------------------------------------
Investment operations
- ----------------------------------------------------------------------------------------------------
Net investment income                                   .21            .26            .55        .62
- ----------------------------------------------------------------------------------------------------
Net realized and unrealized gain (loss)
on investments                                         (.25)          (.07)           .50       (.98)
- ----------------------------------------------------------------------------------------------------
Total from investment operations                       (.04)           .19           1.05       (.36)
- ----------------------------------------------------------------------------------------------------
Distributions to shareholders:
- ----------------------------------------------------------------------------------------------------
From net investment income                             (.20)          (.30)          (.56)      (.64)
- ----------------------------------------------------------------------------------------------------
From net realized gain on investments                    --             --             --         --
- ----------------------------------------------------------------------------------------------------
From return of capital                                   --             --           (.05)        --
- ----------------------------------------------------------------------------------------------------
Total distributions                                    (.20)          (.30)          (.61)      (.64)
- ----------------------------------------------------------------------------------------------------
Net asset value, end of period                        $8.19          $8.54          $8.65      $8.21
- ----------------------------------------------------------------------------------------------------
Total investment return at net 
asset value  (%) (a)                                   (.52)(b)       2.13(b)       13.42      (4.06)
- ----------------------------------------------------------------------------------------------------
Net assets, end of period  (in thousands)            $5,691     $2,019,847     $2,183,766 $2,412,154
- ----------------------------------------------------------------------------------------------------
Ratio of expenses to average net assets (%)(c)          .59(b)         .48(b)         .94        .83
- ----------------------------------------------------------------------------------------------------
Ratio of net investment income to 
average net assets (%)                                 2.22(b)        2.99(b)        6.62       6.93
- ----------------------------------------------------------------------------------------------------
Portfolio turnover (%)                               331.61         145.21(b)      468.86     331.61
- ----------------------------------------------------------------------------------------------------



<CAPTION>

Financial highlights (Continued)
(For a share outstanding throughout the period)

                                                           Year ended September 30
- ---------------------------------------------------------------------------------------------
                                                           1993           1992           1991
- ---------------------------------------------------------------------------------------------
                                                        Class A
- ---------------------------------------------------------------------------------------------
<S>                                                     <C>             <C>         <C>
Net asset value, beginning of period                      $9.32          $9.60          $9.32
- ---------------------------------------------------------------------------------------------
Investment operations
- ---------------------------------------------------------------------------------------------
Net investment income                                       .77            .56            .70
- ---------------------------------------------------------------------------------------------
Net realized and unrealized gain (loss)
on investments                                             (.13)           .12            .59
- ---------------------------------------------------------------------------------------------
Total from investment operations                            .64            .68           1.29
- ---------------------------------------------------------------------------------------------
Distributions to shareholders:
- ---------------------------------------------------------------------------------------------
From net investment income                                 (.75)          (.56)          (.70)
- ---------------------------------------------------------------------------------------------
From net realized gain on investments                        --           (.40)          (.31)
- ---------------------------------------------------------------------------------------------
From return of capital                                       --             --             --
- ---------------------------------------------------------------------------------------------
Total distributions                                        (.75)          (.96)         (1.01)
- ---------------------------------------------------------------------------------------------
Net asset value, end of period                            $9.21          $9.32          $9.60
- ---------------------------------------------------------------------------------------------
Total investment return at net asset value  (%) (a)        7.20           7.56          14.49
- ---------------------------------------------------------------------------------------------
Net assets, end of period  (in thousands)            $3,530,130     $4,275,225     $5,045,139
- ---------------------------------------------------------------------------------------------
Ratio of expenses to average net assets (%)(c)              .91            .96            .97
- ---------------------------------------------------------------------------------------------
Ratio of net investment income to
average net assets (%)                                     8.39           6.03           7.39
- ---------------------------------------------------------------------------------------------
Portfolio turnover (%)                                   235.61         798.43         469.45
- ---------------------------------------------------------------------------------------------

*     Unaudited.
**    Per share net investment income has been determined on the basis of the weighted average 
      number of shares outstanding during the period.
(a)   Total investment return assumes dividend reinvestment and does not reflect the effect of 
      sales charges.
(b)   Not annualized.
(c)   The ratio of expenses to average net assets for the periods ended September 30, 1995 and 
      thereafter includes amounts paid through expense offset arrangements. Prior period ratios 
      exclude these amounts (Note 2).

</TABLE>



Notes to financial statements
March 31, 1996 (Unaudited)

Note 1
Significant accounting policies

The fund is registered under the Investment Company Act of 1940, as 
amended, as a diversified, open-end management investment company. The 
fund seeks high current income, with preservation of capital as its 
secondary objective. 

The fund offers class A, class B and class M shares. Class A shares are 
sold with a maximum front-end sales charge of 4.75%. Class B shares, 
which convert to class A shares after approximately eight years, do not 
pay a front-end sales charge, but pay a higher ongoing distribution fee 
than class A shares, and are subject to a contingent deferred sales 
charge, if those shares are redeemed within six years of purchase. Class 
M shares are sold with a maximum front-end sales charge of 3.25% and pay 
an ongoing distribution fee that is lower than class B shares and higher 
than class A shares. 

Expenses of the fund are borne pro-rata by the holders of each class of 
shares, except that each class bears expenses unique to that class 
(including the distribution fees applicable to such class). Each class 
votes as a class only with respect to its own distribution plan or other 
matters on which a class vote is required by law or determined by the 
Trustees. Shares of each class would receive their pro-rata share of the 
net assets of the fund, if the fund were liquidated. In addition, the 
Trustees declare separate dividends on each class of shares.

The following is a summary of significant accounting policies 
consistently followed by the fund in the preparation of its financial 
statements. The preparation of financial statements is in conformity 
with generally accepted accounting principles and requires management to 
make estimates and assumptions that affect the reported amounts of 
assets and liabilities. Actual results could differ from those 
estimates.

A) Security valuations Investments for which market quotations are 
readily available are stated at market value, which is determined using 
the last reported sale price, or, if no sales are reported--as in the 
case of most securities traded over-the-counter--the last reported bid 
price. Short-term investments having remaining maturities of 60 days or 
less are stated at amortized cost, which approximates market value, and 
other investments are stated at fair value following procedures approved 
by the Trustees. 

B) Joint trading account Pursuant to an exemptive order issued by the 
Securities and Exchange Commission, the fund may transfer uninvested 
cash balances into a joint trading account along with the cash of other 
registered investment companies managed by Putnam Investment Management, 
Inc. ("Putnam Management"), the fund's Manager, a wholly-owned 
subsidiary of Putnam Investments, Inc. and certain other accounts. These 
balances may be invested in one or more repurchase agreements and/or 
short-term money market instruments. 

C) Repurchase agreements The fund, or any joint trading account, through 
its custodian, receives delivery of the underlying securities, the 
market value of which at the time of purchase is required to be in an 
amount at least equal to 102% of the resale price, including accrued 
interest. Putnam Management is responsible for determining that the 
value of these underlying securities is at all times at least equal to 
102% of the resale price, including accrued interest.

D) 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. Discounts on zero 
coupon bonds are accreted according to the effective yield method.

E) Federal taxes It is the policy of the fund to distribute all of its 
taxable 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 on securities held and for excise tax on income and capital 
gains.

At September 30, 1995, the fund had a capital loss carryover of 
approximately $1,474,761,000 available to offset future capital gains, 
if any. The amount of the carryover and the expiration dates are:

     Loss Carryover     Expiration
     --------------     --------------------
     $1,165,356,000     September 30, 1998
     $   45,648,000     September 30, 2001
     $    7,767,000     September 30, 2002
     $  255,990,000     September 30, 2003

F) Distributions to shareholders Distributions to shareholders from net 
investment income are recorded by the fund on the ex-dividend date. 
Capital gain distributions, if any, are recorded on the ex-dividend date 
and paid at least annually. 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. 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.

Note 2
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 following annual rates: 0.60% of the 
first $500 million of average net assets, 0.50% of the next $1 billion, 
0.45% of the next $1 billion, 0.40% of the next $4.5 billion, 0.375% of 
the next $2.5 billion, and 0.35% of any excess over $9.5 billion, 
subject under current law, to reduction in any year to the extent that 
expenses (exclusive of distribution fees, brokerage, interest and taxes) 
of the fund exceed 2.5% of the first $30 million of average net assets, 
2% of the next $70 million and 1.5% of any excess over $100 million by 
the amount of certain brokerage commissions and fees (less expenses) 
received by affiliates of Putnam Management on the fund's portfolio 
transactions.

The fund reimburses Putnam Management 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.

Trustees of the fund receive an annual Trustees fee of $2,970 and an 
additional fee for each Trustee's meeting attended. Trustees who are not 
interested persons of Putnam Management and who serve on committees of 
the Trustees receive additional fees for attendance at certain committee 
meetings.

The fund adopted a Trustee Fee Deferral Plan (the "Plan") which allows 
the Trustees to defer the receipt of all or a portion of Trustees Fees 
payable on or after July 1, 1995. The deferred fees remain in the fund 
and are invested in the fund or in other Putnam funds until distribution 
in accordance with the Plan.

Custodial functions for the fund's assets are provided by Putnam 
Fiduciary Trust Company (PFTC), a wholly-owned subsidiary of Putnam 
Investments, Inc. Investor servicing agent functions are provided by 
Putnam Investor Services, a division of PFTC. 

For the six months ended March 31, 1996, fund expenses were reduced by 
$604,735 under expense offset arrangements with PFTC. Investor servicing 
and custodian fees reported in the Statement of operations exclude these 
credits. The fund could have invested the assets utilized in connection 
with the expense offset arrangements in an income producing asset if it 
had not entered into such arrangements.

The fund has adopted distribution plans (the "Plans") with respect to 
its class A, class B and class M shares pursuant to Rule 12b-1 under the 
Investment Company Act of 1940. The purpose of the Plans is to 
compensate Putnam Mutual Funds Corp., a wholly-owned subsidiary of 
Putnam Investments, Inc., for services provided and expenses incurred by 
it in distributing shares of the fund. The Plans provide for payments by 
the fund to Putnam Mutual Funds Corp. at an annual rate up to 0.35%, 
1.00% and 1.00% of the average net assets attributable to class A, class 
B and class M shares, respectively. The Trustees have approved payment 
by the fund at an annual rate of 0.25%, 1.00% and 0.50% of the average 
net assets attributable to class A, class B and class M shares 
respectively.

For the six months ended March 31, 1996, Putnam Mutual Funds Corp., 
acting as underwriter received net commissions of $58,148 and $404 from 
the sale of class A and class M shares, respectively and received 
$15,149 in contingent deferred sales charges from redemptions of class B 
shares. A deferred sales charge of up to 1% is assessed on certain 
redemptions of class A shares. For the six months ended March 31, 1996, 
Putnam Mutual Funds Corp., acting as underwriter received $10,430 on 
class A redemptions.

Note 3
Purchase and sales of securities

During the six months ended March 31, 1996, purchases and sales of U.S 
government obligations other than short-term investments aggregated 
$2,909,072,079 and $3,158,637,853, respectively. In determining the net 
gain or loss on securities sold, the cost of securities has been 
determined on the identified cost basis.

Note 4
Capital shares

At March 31, 1996, there was an unlimited number of shares of beneficial 
interest authorized. Transactions in capital shares were as follows:

                     Six months ended March 31, 1996
- ----------------------------------------------------
Class A                      Shares           Amount
- ----------------------------------------------------
Shares sold               4,320,177      $37,749,445
- ----------------------------------------------------
Shares issued in 
connection with 
reinvestment of 
distributions             4,022,194       35,034,337
- ----------------------------------------------------
                          8,342,371       72,783,782

Shares 
repurchased             (24,147,753)    (211,168,944)
- ----------------------------------------------------
Net decrease            (15,805,382)   $(138,385,162)
- ----------------------------------------------------

                       Year ended September 30, 1995
- ----------------------------------------------------
Class A                      Shares           Amount
- ----------------------------------------------------
Shares sold               6,624,630      $54,980,481
- ----------------------------------------------------

Shares issued 
in connection with 
reinvestment of 
distributions             9,059,519       74,915,985
- ----------------------------------------------------
                         15,684,149      129,896,466

Shares 
repurchased             (57,082,955)    (471,766,626)
- ----------------------------------------------------
Net decrease            (41,398,806)   $(341,870,160)
- ----------------------------------------------------

                     Six months ended March 31, 1996
- ----------------------------------------------------
Class B                      Shares           Amount
- ----------------------------------------------------
Shares sold               1,258,162      $10,945,192
- ----------------------------------------------------
Shares issued 
in connection with 
reinvestment of 
distributions                31,872          276,677
- ----------------------------------------------------
                          1,290,034       11,221,869

Shares 
repurchased                (336,350)     (2,939,277)
- ----------------------------------------------------
Net increase                953,684       $8,282,592
- ----------------------------------------------------

                       Year ended September 30, 1995
- ----------------------------------------------------
Class B                      Shares           Amount
- ----------------------------------------------------
Shares sold               1,205,771      $10,033,873
- ----------------------------------------------------

Shares issued 
in connection with 
reinvestment of 
distributions                25,686          214,274
- ----------------------------------------------------
                          1,231,457       10,248,147

Shares 
repurchased                (871,188)      (7,180,267)
- ----------------------------------------------------
Net increase                360,269       $3,067,880
- ----------------------------------------------------

                     Six months ended March 31, 1996
- ----------------------------------------------------
Class M                      Shares           Amount
- ----------------------------------------------------
Shares sold                  48,841         $420,938
- ----------------------------------------------------
Shares issued 
in connection with 
reinvestment of 
distributions                 2,368           20,604
- ----------------------------------------------------
                             51,209          441,542

Shares 
repurchased                 (32,822)        (282,273)
- ----------------------------------------------------
Net increase                 18,387         $159,269
- ----------------------------------------------------

                    For the period February 14, 1995
                         (commencement of operations) 
                               to September 30, 1995
- ----------------------------------------------------
Class M                      Shares           Amount
- ----------------------------------------------------
Shares sold                  76,597         $645,492
- ----------------------------------------------------
Shares issued 
in connection with 
reinvestment of 
distributions                 1,133            9,656
- ----------------------------------------------------
                             77,730          655,148

Shares 
repurchased                     (47)           (400)
- ----------------------------------------------------
Net increase                 77,683         $654,748
- ----------------------------------------------------



Our commitment to quality service

* CHOOSE AWARD-WINNING SERVICE
Putnam Investor Services has won the DALBAR Quality Tested Service Seal 
for the past six years. In 1995, over 146,000 tests of 56 shareholder 
service components demonstrated that Putnam outperformed the industry 
standard in every category.

* HELP YOUR INVESTMENT GROW

Set up a systematic program for investing with as little as $25 a month 
from a Putnam money market fund or from your checking or savings 
account.*

* SWITCH FUNDS EASILY

You can move money from one account to another with the same class of 
shares without a service charge. (This privilege is subject to change or 
termination.)

* ACCESS YOUR MONEY QUICKLY

You can get checks sent regularly or redeem shares any business day at 
the then-current net asset value, which may be more or less than the 
original cost of the shares.

For details about any of these or other services, contact your financial 
advisor or call the toll-free number shown below and speak with a 
helpful Putnam representative.

To make an additional investment in this or any other Putnam fund, 
contact your financial advisor or call our toll-free number: 1-800-225-
1581.
* Regular investing of course, does not guarantee a profit or 
  protect against a loss in a declining market.



Fund information


INVESTMENT MANAGER

Putnam Investment 
Management, Inc.
One Post Office Square
Boston, MA 02109

MARKETING SERVICES

Putnam Mutual Funds Corp. 
One Post Office Square
Boston, MA 02109

CUSTODIAN

Putnam Fiduciary Trust Company

LEGAL COUNSEL

Ropes & Gray

TRUSTEES

George Putnam, Chairman
William F. Pounds, Vice Chairman
Jameson Adkins Baxter
Hans H. Estin
John A. Hill
Elizabeth T. Kennan
Lawrence J. Lasser
Robert E. Patterson
Donald S. Perkins
George Putnam, III
Eli Shapiro
A.J.C. Smith
W. Nicholas Thorndike

OFFICERS

George Putnam
President 

Charles E. Porter
Executive Vice President

Patricia C. Flaherty
Senior Vice President

John D. Hughes
Senior Vice President and Treasurer

Lawrence J. Lasser
Vice President 

Gordon H. Silver
Vice President 

Gary N. Coburn
Vice President

Alan J. Bankart
Vice President

Michael Martino
Vice President and Fund Manager 

William N. Shiebler
Vice President 

John R. Verani
Vice President 

Paul M. O'Neil
Vice President 

Beverly Marcus
Clerk and Assistant Treasurer

This report is for the information of shareholders of Putnam American 
Government Income Fund. It may also be used as sales literature when 
preceded or accompanied by the current prospectus, which gives details 
of sales charges, investment objectives, and operating policies of the 
fund, and the most recent copy of Putnam's Quarterly Performance 
Summary. For more information, or to request a prospectus, call toll 
free: 1-800-225-1581.

Shares of mutual funds are not deposits or obligations of, or guaranteed 
or endorsed by, any financial institution, are not insured by the 
Federal Deposit Insurance Corporation (FDIC), the Federal Reserve Board 
or any other agency, and involve risk, including the possible loss of 
principal amount invested.



PUTNAM INVESTMENTS

The Putnam Funds
One Post Office Square
Boston, Massachusetts 02109


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