KEMPER ADJUSTABLE RATE U S GOVERNMENT FUND
N-30D, 1998-10-29
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<PAGE>   1
                                                                ANNUAL REPORT TO
                                                       SHAREHOLDERS FOR THE YEAR
                                                           ENDED AUGUST 31, 1998

LONG-TERM INVESTING IN A SHORT-TERM WORLD (SM)

[LOGO]

Offering investors the opportunity for high current
income consistent with low volatility of principal

KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND

              "...Although the market environment hasn't been good
             for adjustable rate mortgages, the fund has done what
         it's designed to do:  provide steady income with little price
              fluctuation despite volatile market conditions. ..."

                                                             [KEMPER FUNDS LOGO]
<PAGE>   2
 

CONTENTS
3
ECONOMIC OVERVIEW
5
PERFORMANCE UPDATE
8
PORTFOLIO STATISTICS
9
PORTFOLIO OF
INVESTMENTS
10
REPORT OF
INDEPENDENT AUDITORS
11
FINANCIAL STATEMENTS
13
NOTES TO
FINANCIAL STATEMENTS
17
FINANCIAL HIGHLIGHTS

AT A GLANCE
- --------------------------------------------------------------------------------
KEMPER ADJUSTABLE RATE
U.S. GOVERNMENT FUND TOTAL RETURNS
- --------------------------------------------------------------------------------
FOR THE YEAR ENDED AUGUST 31, 1998
(UNADJUSTED FOR ANY SALES CHARGE)

 
                                  [BAR GRAPH]
- -------------------------------------------------------------------------------
<TABLE>
<S>                                                         <C>
CLASS A                                                     3.68%
CLASS B                                                     3.06%
CLASS C                                                     3.10%
LIPPER ADJUSTABLE RATE MORTGAGE FUNDS CATEGORY AVERAGE*     4.93%
- -------------------------------------------------------------------------------
</TABLE>

Returns and rankings are historical and do not guarantee future results.
Investment returns and principal values will fluctuate so that shares when
redeemed may be worth more or less than original cost.
 
*Lipper Analytical Services, Inc. rankings are based upon changes in net asset
 value with all dividends reinvested and do not include the effect of sales
 charges and, if they had, results may have been less favorable.
 
<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------
NET ASSET VALUE
- -------------------------------------------------------------------------------
                                  AS OF     AS OF
                                 8/31/98   8/31/97
- -------------------------------------------------------------------------------
<S>                                <C>       <C>         
KEMPER ADJUSTABLE RATE U.S.
GOVERNMENT FUND CLASS A            $8.19     $8.31
- -------------------------------------------------------------------------------
KEMPER ADJUSTABLE RATE U.S.
GOVERNMENT FUND CLASS B            $8.21     $8.32
- -------------------------------------------------------------------------------
KEMPER ADJUSTABLE RATE U.S.
GOVERNMENT FUND CLASS C            $8.22     $8.33
- -------------------------------------------------------------------------------
</TABLE>

- ------------------------------------------------------------------------------- 
 KEMPER ADJUSTABLE RATE U.S. GOVERNMENT
 FUND RANKINGS AS OF 8/31/98
- -------------------------------------------------------------------------------
COMPARED TO ALL OTHER FUNDS IN THE LIPPER ADJUSTABLE RATE MORTGAGE FUNDS
CATEGORY*
 
<TABLE>
<CAPTION>
               CLASS A    CLASS B    CLASS C
- -------------------------------------------------------------------------------
 <S>           <C>        <C>        <C>      
 1-YEAR         #32 of     #34 of     #33 of
               34 funds   34 funds   34 funds
- -------------------------------------------------------------------------------
 5-YEAR         #23 of      N/A        N/A
               25 funds
- -------------------------------------------------------------------------------
</TABLE>

- ------------------------------------------------------------------------------- 
 DIVIDEND REVIEW
- --------------------------------------------------------------------------------

THE FOLLOWING TABLE SHOWS PER SHARE DIVIDEND AND YIELD INFORMATION FOR THE FUND
AS OF AUGUST 31, 1998.
 
<TABLE>
<CAPTION>
                      CLASS    CLASS    CLASS
                        A        B        C
- -------------------------------------------------------------------------------
<S>                  <C>      <C>      <C>    
ONE-YEAR INCOME:     $.4196   $.3604   $.3638
- -------------------------------------------------------------------------------
AUGUST DIVIDEND:     $.0300   $.0254   $.0257
- -------------------------------------------------------------------------------
ANNUALIZED
DISTRIBUTION RATE+:   4.40%    3.71%    3.75%
- -------------------------------------------------------------------------------
SEC YIELD+:           4.25%    3.75%    3.78%
- -------------------------------------------------------------------------------
</TABLE>
 
+ Current annualized distribution rate is the latest monthly dividend shown as
  an annualized percentage of net asset value on August 31, 1998. Distribution
  rate simply measures the level of dividends and is not a complete measure of
  performance. The SEC yield is net investment income per share earned over the
  month ended August 31, 1998, shown as an annualized percentage of the maximum
  offering price on that date. The SEC yield is computed in accordance with the
  standardized method prescribed by the Securities and Exchange Commission.
  Yields and distribution rates are historical and will fluctuate.
 
TERMS TO KNOW
 
YOUR FUND'S STYLE
 
- -------------------------------------------------------------------------------
MORNINGSTAR FIXED-INCOME STYLE BOX
- -------------------------------------------------------------------------------

[MATURITY QUALITY DIAGRAM]

Source: Data provided by Morningstar, Inc., Chicago, IL 312-696-6000. The
Fixed-Income Style Box placement is based on a fund's average effective maturity
or duration and the average credit rating of the bond portfolio. 

Please note that style boxes do not represent an exact assessment of risk and do
not represent future performance. Please consult the prospectus for a
description of investment policies.
 
ADJUSTABLE RATE MORTGAGES (ARMS) Mortgages whose interest rates adjust
periodically based on changes to a corresponding index rate. To help protect the
borrower against dramatic rate increases in a short period of time, ARMs are
often originated with interest rate caps. An interest rate cap assures the
borrower that the rate will not adjust beyond a certain point within a specific
period.
 
DURATION A measure of the interest rate sensitivity of a fixed-income investment
or portfolio. The longer the duration, the greater the interest rate risk.
 
FLIGHT-TO-QUALITY BUYING When investors move assets from foreign equity and
foreign bond securities to U.S. Treasuries and other high quality securities in
times of global economic uncertainty.
 
TOTAL RETURN A fund's total return figure measures both the net investment
income and any realized and unrealized appreciation or depreciation of the
underlying investments in its portfolio for the period. Total return assumes the
reinvestment of all dividends and represents the aggregate percentage or dollar
value change over the period.

<PAGE>   3
ECONOMIC OVERVIEW

[SILVIA PHOTO]
 
DR. JOHN E. SILVIA IS A MANAGING DIRECTOR OF SCUDDER KEMPER INVESTMENTS, INC.
HIS PRIMARY RESPONSIBILITIES INCLUDE ANALYSIS, MODELING AND FORECASTING OF
ECONOMIC DEVELOPMENTS AND FEDERAL RESERVE ACTIVITY THAT AFFECT FINANCIAL
MARKETS, ESPECIALLY INTEREST RATE TRENDS. THIS EFFORT INCLUDES CLOSE
COLLABORATION WITH BOTH INCOME AND EQUITY MUTUAL FUND MANAGERS AND PENSION FUND
MANAGERS.
SILVIA HOLDS A BACHELOR OF ARTS DEGREE AND PH.D. IN ECONOMICS FROM NORTHEASTERN
UNIVERSITY IN BOSTON AND HAS A MASTER'S DEGREE IN ECONOMICS FROM BROWN
UNIVERSITY IN PROVIDENCE, R.I. PRIOR TO HIS CAREER AT SCUDDER KEMPER, HE WAS
WITH THE HARRIS BANK AND ALSO TAUGHT AT INDIANA UNIVERSITY.
 
SCUDDER KEMPER INVESTMENTS, INC. IS THE INVESTMENT MANAGER FOR KEMPER FUNDS. IT
IS ONE OF THE LARGEST AND MOST EXPERIENCED INVESTMENT MANAGEMENT ORGANIZATIONS
WORLDWIDE, MANAGING MORE THAN $239 BILLION IN ASSETS GLOBALLY FOR MUTUAL FUND
INVESTORS, RETIREMENT AND PENSION PLANS, INSTITUTIONAL AND CORPORATE CLIENTS,
INSURANCE COMPANIES AND PRIVATE, FAMILY AND INDIVIDUAL ACCOUNTS.
 
DEAR SHAREHOLDERS,
 
The third quarter of 1998 ended on a mildly positive note with the Federal
Reserve Board (the Fed) reducing interest rates by 1/4 of a point to 5.25
percent. While some investors were disappointed by the small size of the
adjustment, it nevertheless provided a moment of relief after several stormy
months. Economic and political instability in Russia, terrorist bombings and
U.S. retaliation overseas, lingering effects of the "contagion" in Asia, not to
mention weak corporate profits and political scandal in the United States were
responsible for considerable uncertainty and market volatility. A series of
market dips and drops continued to fuel the debate about whether we would
finally see the end of our long-running bull market -- or even plummet into a
recession.
 
  The Fed's mid-September bank credit survey indicated that domestic banks are
tightening credit standards for both large and small borrowers. This suggests a
reduction in the supply of credit going forward with subsequent negative impacts
on employment growth and capital spending. In this sense, there is the beginning
of a credit crunch starting in U.S. bank credit markets.
 
  But investors should find comfort in the fact that economic fundamentals
continue to favor financial assets in the U.S. -- particularly Treasury bonds.
In a nutshell, the nation's economy remains strong despite its slowdown in the
second half of the year. Short-term interest rates are expected to remain low
for the remainder of the year. There are no major tax or regulatory threats
waiting in the wings. And our economy continues to draw investors from around
the world, although perhaps not as fervently as last year.
 
  The nation's gross domestic product (GDP), which represents the total value of
all goods and services produced within the U.S. economy, is expected to have
grown at an annualized rate of 2 percent in the third quarter of 1998. Faster
growth can be attributed to several one-time factors, including a domestic
correction in inventory levels and the end of the General Motors strike.

  Real capital spending and employment growth have remained solid. Consumer
confidence remains fairly high. Home sales remain robust. Economic policy
continues to support the nation's fiscal budget surplus projection of $65
billion.
 
  As far as inflation goes, there are two tales to be told. Prices for consumer
goods, as measured by the consumer price index (CPI), are steady. Compare this
to prices for services, which have risen between 2.5 and 3.5 percent. For
investors, this difference in pricing flexibility translates into a difference
in profit expectations. Profits of domestic service firms should be much
stronger than commodity producers dependent on export markets.
 
  Across the Atlantic, Europe's economy appears to be growing at an even pace as
the region progresses toward the Economic and Monetary Union (EMU) slated for
January 1, 1999. One effect of the union may be a slight rise in short-term
interest rates in Europe -- not because there will be an overt change in policy,
but simply because of the convergence of some very disparate interest rates. The
average rate will likely be higher than the relatively attractive rate the
German Central Bank currently offers, for example.
 
  In Asia, which has been making headlines around the world for more than a year
now, the latest news is from Japan, which recently installed a new prime
minister as well as a new finance minister. Much discussion will be focused on
changes in Japan's economic policy, particularly in terms of taxation and
banking reform -- and patience is in order. Most of the changes in taxation will
impact Japan in the first half of 1999. But as far as banking reform goes, those
of us familiar with bank reform in the U.S. know that this will be a two- to
five-year process. Certainly, investors are looking to Japan to spark recovery
for Asia as a whole, which continues to suffer from the "contagion" of low
currency values, seriously reduced consumer spending and general economic
malaise.
 
  Indeed, while its full effects remain to be seen -- and felt -- by the
majority of American businesses and individuals, the Asian economic crisis has
contributed to the general uncertainty of the emotion-driven U.S. markets.
Whether it's an economic crisis abroad or political scandal at home, current
events move the investors who move the markets.
 
                                                                               3
<PAGE>   4
ECONOMIC OVERVIEW 

- --------------------------------------------------------------------------------
ECONOMIC GUIDEPOSTS
- --------------------------------------------------------------------------------
ECONOMIC ACTIVITY IS A KEY INFLUENCE ON INVESTMENT PERFORMANCE AND SHAREHOLDER
DECISION-MAKING. PERIODS OF RECESSION OR BOOM, INFLATION OR DEFLATION, CREDIT
EXPANSION OR CREDIT CRUNCH HAVE A SIGNIFICANT IMPACT ON MUTUAL FUND PERFORMANCE.
    THE FOLLOWING ARE SOME SIGNIFICANT ECONOMIC GUIDEPOSTS AND THEIR INVESTMENT
RATIONALE THAT MAY HELP YOUR INVESTMENT DECISION-MAKING. THE 10-YEAR TREASURY
RATE AND THE PRIME RATE ARE PREVAILING INTEREST RATES. THE OTHER DATA REPORT
YEAR-TO-YEAR PERCENTAGE CHANGES.
 
                                  [BAR GRAPH]
<TABLE>
<CAPTION>
        MEASUREMENT PERIOD
       (FISCAL YEAR COVERED)           NOW (9/30/98)         6 MONTHS AGO          1 YEAR AGO          2 YEARS AGO
<S>                                  <C>                  <C>                  <C>                  <C>
10-YEAR TREASURY RATE(1)                    4.81                 5.64                 6.03                 6.53
PRIME RATE(2)                               8.49                  8.5                  8.5                 8.25
INFLATION RATE(3)                           1.68                  2.3                 2.22                    3
THE U.S. DOLLAR(4)                          4.31                 3.92                 7.62                 4.74
CAPITAL GOODS ORDERS(5)*                   11.33                10.47                15.67                 4.79
INDUSTRIAL PRODUCTION(5)*                   3.07                 4.49                 4.99                 3.18
EMPLOYMENT GROWTH(6)                        2.41                 2.57                 2.65                 2.22
</TABLE>
 
(1) FALLING INTEREST RATES IN RECENT YEARS HAVE BEEN A BIG PLUS FOR FINANCIAL
    ASSETS.
 
(2) THE INTEREST RATE THAT COMMERCIAL LENDERS CHARGE THEIR BEST BORROWERS.
 
(3) INFLATION REDUCES AN INVESTOR'S REAL RETURN. IN THE LAST FIVE YEARS,
    INFLATION HAS BEEN AS HIGH AS 6 PERCENT. THE LOW, MODERATE INFLATION OF THE
    LAST FEW YEARS HAS MEANT HIGH REAL RETURNS. 

(4) CHANGES IN THE EXCHANGE VALUE OF THE DOLLAR IMPACT U.S. EXPORTERS AND THE
    VALUE OF U.S. FIRMS' FOREIGN PROFITS.
 
(5) THESE INFLUENCE CORPORATE PROFITS AND EQUITY PERFORMANCE.
 
(6) AN INFLUENCE ON FAMILY INCOME AND RETAIL SALES.
 
                                          *DATA AS OF AUGUST 31, 1998.
 
   SOURCE: ECONOMICS DEPARTMENT, SCUDDER KEMPER INVESTMENTS, INC.
 
  One might conclude that, as a result of 1998's slow corporate profit growth
and turmoil in Russia and Asia, the psychology of the markets is
shifting -- even some of Wall Street's most resolute bulls appear to be
reconsidering their long-held convictions. But with the economy's strong
fundamentals in place, the outlook for a bear market is premature. In any case,
prudent investors are wise to watch for the following economic warning signs:
inflation in the form of rising wages and/or prices; residual fallout from Asia,
which could appear in the form of reduced sales and earnings for American
businesses; and a continued widening of our trade deficit, an imbalance caused
by heightened American demand for foreign goods and services. In the months to
come, investors are likely to maintain their bias in favor of investments that
have historically been considered more conservative: larger capitalization
stocks, U.S. Treasuries and only the highest-grade corporate bonds.
 
  Thank you for your continued support. We appreciate the opportunity to serve
your investment needs.
 
Sincerely,
 
JOHN E. SILVIA
 
JOHN E. SILVIA
 
October 9, 1998
 
 4
 

<PAGE>   5
PERFORMANCE UPDATE

RICHARD VANDENBERG JOINED SCUDDER KEMPER INVESTMENTS, INC. IN MARCH 1996 AND IS
A MANAGING DIRECTOR. HE IS ALSO LEAD PORTFOLIO MANAGER OF KEMPER ADJUSTABLE RATE
U.S. GOVERNMENT FUND. VANDENBERG HAS 25 YEARS OF FIXED-INCOME PORTFOLIO
MANAGEMENT EXPERIENCE. HE RECEIVED A BACHELOR'S DEGREE AND M.B.A. FROM THE
UNIVERSITY OF WISCONSIN.

JOHN DUGENSKE IS A VICE PRESIDENT OF SCUDDER KEMPER INVESTMENTS AND A PORTFOLIO
MANAGER FOR KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND. HE EARNED HIS
BACHELOR'S AND MASTER'S DEGREES IN MECHANICAL ENGINEERING AND AN M.B.A. FROM THE
UNIVERSITY OF ILLINOIS.

SCOTT DOLAN JOINED SCUDDER KEMPER INVESTMENTS IN 1989 AND IS A VICE PRESIDENT.
HE IS ALSO A PORTFOLIO MANAGER FOR KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND.
HE RECEIVED A BACHELOR'S DEGREE IN BUSINESS ADMINISTRATION MAJORING IN FINANCE
FROM NORTHEASTERN UNIVERSITY AND AN MS DEGREE IN FINANCE FROM BOSTON COLLEGE.
 
THE VIEWS EXPRESSED IN THIS REPORT REFLECT THOSE OF THE PORTFOLIO MANAGEMENT
TEAM ONLY THROUGH THE END OF THE PERIOD OF THE REPORT, AS STATED ON THE COVER.
THE MANAGERS' VIEWS ARE SUBJECT TO CHANGE AT ANY TIME, BASED ON MARKET AND OTHER
CONDITIONS.
 
THROUGHOUT THE FUND'S FISCAL YEAR, TURBULENT INTERNATIONAL MARKETS PROMPTED
INVESTORS TO FLEE TO THE RELATIVE SAFETY OF U.S. GOVERNMENT BONDS. THE RESULTING
DROP IN INTEREST RATES WAS GOOD FOR THE U.S. GOVERNMENT BOND MARKET, BUT CREATED
A DIFFICULT ENVIRONMENT FOR A FUND FOCUSED ON ADJUSTABLE RATE MORTGAGE BONDS.
BELOW, THE MANAGERS DISCUSS THE REASONS WHY.
 
Q     WHAT WERE THE MOST SIGNIFICANT FACTORS THAT AFFECTED THE INVESTMENT
ENVIRONMENT DURING THE FISCAL YEAR?
 
A     Without a doubt, the most significant impact was felt as a result of
instability in foreign bond markets -- first from developments in Asia, then in
Latin America and Russia.
 
      Before the fiscal year began, news about potential economic and currency
problems in Asian countries had been circulating for a while. Investors began to
realize that the outsized growth experienced by these countries -- particularly
Hong Kong, Thailand, Malaysia and Indonesia -- was supported largely by intense
speculation worldwide. This support reversed itself in the summer of 1997 and
came to a head in October as the Hong Kong stock market imploded and other
countries devalued their currencies.
 
      However, the problems abroad led to strong performance by government bonds
here in the United States. Investors opted for the relatively safe haven of
Treasuries, and demand drove Treasury bond prices sharply higher. At the same
time, investors expected cheaper foreign goods to put a damper on U.S.
inflation, and lower exports to impede U.S. economic growth. You must remember
that, in early 1998, the U.S. economy appeared to be growing quite rapidly. The
troubles in foreign markets changed this perception and suggested an opportunity
for lower interest rates in the future, which is positive for bonds.
 
      In 1998, as the Asian crisis spread to other developing economies, Latin
American countries also started to experience problems, and most recently,
Russia effectively devalued the ruble. This continuing turmoil further increased
demand for U.S. government bonds, and the result was that Treasuries staged a
powerful rally in August as the fiscal year drew to a close.
 
Q     HOW DID THESE EVENTS AFFECT THE FUND?
 
A     Normally, falling interest rates are a good thing for bonds. Lower yields
in the marketplace mean that the higher yields offered by previously issued
bonds become more attractive. Therefore, lower interest rates cause prices on
existing bonds to rise. However, that's not the case with adjustable rate
mortgage bonds (ARMs). Because the yields on these bonds adjust to the
prevailing interest rate, they do not offer an advantage when rates decline.
 
      ARMs currently are in a sort of no-win situation: no supply, no demand. As
rates decline, ARM owners tend to refinance their ARMs into low fixed rate
mortgages. Therefore, the universe of ARMs in which we can invest is shrinking.
This dynamic makes it very difficult to make headway in this environment,
because we get money from the prepayments, but there are very
 
                                                                               5
<PAGE>   6
PERFORMANCE UPDATE
 
few attractively priced ARMs available to buy.
 
      Additionally, there is little demand, because the spread between
short-term rates and long-term rates is historically narrow right now.
Currently, a 3-month Treasury Bill offers nearly the same yield as a 5-year
Treasury Note. With yields on short-term instruments being so attractive, most
investors prefer to invest in them rather than ARMs, so the supply of ARMs has
shriveled.
 
      Overall, our strategy with the ARM portion of the portfolio is to let them
pay down and reinvest the proceeds in high quality instruments such as
short-maturity Treasuries that provide nearly as attractive a yield, but no
prepayment risk. However, because 65 percent of the portfolio must be invested
in ARMs, our options are limited.
 
Q     SO THE ENVIRONMENT FOR ARMS HASN'T BEEN GREAT. HAS THERE BEEN ANY UPSIDE?
 
A     The positive side is that, while markets have been volatile, the fund
posted a positive return. Not every sector of the bond market can say that for
the 1-year period ended August 31, 1998. Corporate bonds, high-yield bonds in
particular, have been battered in the last couple of months as investors have
become concerned about credit quality if the economy does slow considerably. So
although the market environment hasn't been good for ARMs, the fund has done
what it's designed to do: provide steady income with little price fluctuation
despite volatile market conditions.
 
Q     HAVE YOU USED ANY STRATEGIES IN YOUR EFFORT TO INCREASE THE FUND'S TOTAL
RETURN DESPITE THE WEAK ARM MARKET?
 
A     Since 65 percent of the fund must be invested in floating rate securities,
we've concentrated on what we can do with the other 35 percent. Primarily, this
involved adjusting the duration of the fund. Duration, as you may know, is an
indication of a portfolio's sensitivity to changes in interest rates. If a fund
manager expects the market to rally and interest rates to go down, he or she
wants to lengthen duration to help the fund participate as much as possible. If
a fund manager expects interest rates to trend up, then he or she wants to
shorten duration to help lessen the negative effects.
 
      As events in foreign markets in late 1997 suggested a rush to U.S. bonds
and a corresponding decline in rates, we increased the fund's duration in
January. We also increased the fund's allocation to Treasuries. We believe the
portfolio is well-positioned for the current environment, and we expect it will
make up ground going forward.
 
Q     WHAT'S YOUR OUTLOOK FOR THE MARKET FROM HERE?
 
A     There probably won't be a lot going on in the ARM market in the
foreseeable future. Interest rates are already at historic lows and are likely
to remain stable or trend slightly lower, since inflation is subdued, and the
economy is showing signs of weakening. The ARM market becomes more active when
interest rates are rising, and we certainly don't expect that to happen.
However, ARMs should still provide investors with a way to invest in a fairly
stable security with a decent yield. As for the fund, we will continue to use
our analytical skills to look for ways to increase the fund's potential return
in the non-ARM portion of its portfolio.
 
                                                                               6
 
                                                              
<PAGE>   7
PERFORMANCE UPDATE

- --------------------------------------------------------------------------------
 AVERAGE ANNUAL TOTAL RETURNS*
- --------------------------------------------------------------------------------
FOR PERIODS ENDED AUGUST 31, 1998 (ADJUSTED FOR THE MAXIMUM SALES CHARGE)
 
<TABLE>
<CAPTION>
                                                    1-YEAR    5-YEAR       LIFE OF CLASS
- ---------------------------------------------------------------------------------------------------
<S>                                                  <C>      <C>         <C>       <C>
KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND A        0.07%    3.47%       6.01%     (since 9/1/87)
- ---------------------------------------------------------------------------------------------------
KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND B        0.10      N/A        3.82      (since 5/31/94)
- ---------------------------------------------------------------------------------------------------
KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND C        3.10      N/A        4.28      (since 5/31/94)
- ---------------------------------------------------------------------------------------------------
</TABLE>

- --------------------------------------------------------------------------------
Kemper Adjustable Rate U.S. Government Fund Class A
- --------------------------------------------------------------------------------

                                 [LINE GRAPH]

- --------------------------------------------------------------------------------
Growth of an assumed $10,000
investments 
in Class A Shares from 9/1/87 to 8/31/98
- --------------------------------------------------------------------------------
                                  
<TABLE>
<CAPTION>
                          Kemper
                        Adjustable      Salomon
                         Rate U.S.    Brothers 6-    Consumer
  Measurement Period    Gov't Class    Month T-       Price
(Fiscal Year Covered)       A(1)      Bill Index**    Index++
- -------------------------------------------------------------
<S>                     <C>           <C>           <C>
9/1/87                     10000         10000         10000
                            9507         10286         10052
                            9818         10427         10087
                           10030         10583         10184
                           10060         10777         10315
                           10190         10982         10472
                           10291         11211         10533
                           10407         11482         10691
                           11028         11707         10848
                           11060         11944         10927
                           11489         12180         11023
                           11169         12428         11250
                           11564         12875         11355
                           11611         12918         11600
                           12315         13138         11696
                           12602         13339         11801
                           12758         13535         11888
                           13494         13715         11993
12/31/91                   13973         13888         12054
                           13940         14008         12177
                           14368         14141         12255
                           14781         14261         12351
                           14819         14378         12404
                           15098         14480         12552
                           15312         14853         12622
                           15485         14770         12684
                           15547         14898         12745
                           15561         15035         12867
                           15499         15210         12937
                           15515         15413         13059
                           15478         15635         13086
                           15943         15889         13234
                           16284         16068         13330
                           16483         16292         13392
12/31/95                   16795         16503         13418
                           16861         16721         13610
                           17041         16942         13698
                           17312         17170         13794
                           17589         17393         13864
                           17828         17629         13986
                           18162         17881         14012
                           18436         18099         14091
                           18641         18337         14100
                           18773         18579         14178
                           18936         18742         14248
8/31/98                    19005         18742         14266
</TABLE>
 
- --------------------------------------------------------------------------------
Kemper Adjustable Rate U.S. Government Fund Class A
- --------------------------------------------------------------------------------

                                 [LINE GRAPH]

- --------------------------------------------------------------------------------
Growth of an assumed $10,000
investments 
in Class A Shares from 1/1/92 to 8/31/98
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                          Kemper
                        Adjustable      Lehman
                         Rate U.S.     Brothers      Consumer
  Measurement Period    Government    Adjustable       Price
(Fiscal Year Covered)    Class A(1)   Rate Index+     Index++
- -------------------------------------------------------------
<S>                     <C>           <C>           <C>
1/1/92                     10000         10000         10000
                           10210         10476         10247
                           10236         10502         10290
                           10429         10752         10413
                           10577         10956         10471
                           10696         11073         10522
                           10739         11130         10573
                           10749         11081         10674
                           10706         11037         10732
                           10717         11113         10834
12/31/94                   10692         11131         10856
                           11013         11596         10979
                           11248         11958         11059
                           11386         12160         11109
                           11601         12433         11131
                           11647         12570         11291
                           11771         12712         11363
                           11958         12950         11443
12/31/96                   12150         13266         11501
                           12315         13443         11603
                           12546         13722         11624
                           12735         13990         11690
                           12877         14182         11697
                           12968         14404         11762
                           13080         14608         11820
8/31/98                    13128         14742         11835
</TABLE>
 
- --------------------------------------------------------------------------------
Kemper Adjustable Rate U.S. Government Fund Class B
- --------------------------------------------------------------------------------

                                 [LINE GRAPH]

- --------------------------------------------------------------------------------
Growth of an assumed $10,000
investments 
in Class B Shares from 5/31/94 to 8/31/98
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                          Kemper
                        Adjustable
                         Rate U.S.      Lehman
                        Government     Brothers      Consumer
  Measurement Period    Fund Class    Adjustable       Price
(Fiscal Year Covered)       B(1)      Rate Index+     Index++
- -------------------------------------------------------------
<S>                       <C>            <C>           <C>
5/31/94                     10000        10000         10000
                          10017.8        10091         10129
                           9958.2        10107         10149
                          10222.1        10529         10264
                          10417.7        10858         10339
                          10550.6        11041         10386
                          10743.8        11289         10407
                          10753.3        11414         10556
                          10821.1        11543         10624
                          10960.1        11759         10698
12/31/96                  11154.7        12046         10753
                            11287        12207         10847
                          11536.5        12460         10868
                          11661.7        12703         10929
12/31/97                  11738.1        12878         10936
                          11799.6        13080         10997
                          11894.5        13265         11051
8/31/98                   11727.4        13386         11064
</TABLE>
 
PAST PERFORMANCE IS NOT A GUARANTEE OF FUTURE RESULTS. INVESTMENT RETURNS AND
PRINCIPAL VALUES WILL FLUCTUATE SO THAT SHARES WHEN REDEEMED MAY BE WORTH MORE
OR LESS THAN ORIGINAL COST.
 
*AVERAGE ANNUAL TOTAL RETURN AND TOTAL RETURN MEASURE NET INVESTMENT INCOME AND
CAPITAL GAIN OR LOSS FROM PORTFOLIO INVESTMENT OVER THE PERIODS SPECIFIED,
ASSUMING REINVESTMENT OF DIVIDENDS AND, WHERE INDICATED, ADJUSTMENT FOR THE
MAXIMUM SALES CHARGE. THE MAXIMUM SALES CHARGE FOR CLASS A SHARES IS 3.5%. FOR
CLASS B SHARES, THE MAXIMUM CONTINGENT DEFERRED SALES CHARGE IS 4%. CLASS C
SHARES HAVE NO SALES ADJUSTMENT, BUT REDEMPTIONS WITHIN ONE YEAR OF PURCHASE MAY
BE SUBJECT TO A CONTINGENT DEFERRED SALES CHARGE OF 1%. SHARE CLASSES INVEST IN
THE SAME UNDERLYING PORTFOLIO. AVERAGE ANNUAL TOTAL RETURN REFLECTS ANNUALIZED
CHANGE WHILE TOTAL RETURN REFLECTS AGGREGATE CHANGE. DURING THE PERIODS NOTED
SECURITIES PRICES WILL FLUCTUATE.
 
PLEASE NOTE THE KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND WAS PREVIOUSLY THE
KEMPER ENHANCED GOVERNMENT INCOME FUND. THE FUND'S INVESTMENT OBJECTIVE AND
POLICIES WERE CHANGED ON JANUARY 1, 1992. PRIOR TO THE CHANGES, THE FUND'S
OBJECTIVE WAS TO SEEK HIGH CURRENT RETURN BY INVESTING PRIMARILY IN U.S.
GOVERNMENT SECURITIES. SINCE THE CHANGE, THE FUND'S OBJECTIVE HAS BEEN TO SEEK
HIGH CURRENT INCOME CONSISTENT WITH LOW VOLATILITY OF PRINCIPAL. THE FUND SEEKS
ITS NEW OBJECTIVE BY INVESTING PRIMARILY IN ADJUSTABLE RATE U.S. GOVERNMENT
SECURITIES. THE FIRST CHART REPRESENTS THE LIFE OF FUND PERFORMANCE (SINCE
SEPTEMBER 1, 1987) AND THE FOLLOWING CHARTS REPRESENT THE FUND'S PERFORMANCE
UNDER ITS NEW OBJECTIVE (SINCE JANUARY 1, 1992).
 
(1)PERFORMANCE INCLUDES REINVESTMENT OF DIVIDENDS AND ADJUSTMENT FOR THE
APPLICABLE SALES CHARGE IN EFFECT AT THE END OF THE PERIOD. IN COMPARING THE
KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND PERFORMANCE TO THE LEHMAN BROTHERS
ADJUSTABLE RATE INDEX, YOU SHOULD ALSO NOTE THAT THE FUND'S PERFORMANCE REFLECTS
THE MAXIMUM SALES CHARGE, WHILE NO SUCH CHARGES ARE REFLECTED IN THE PERFORMANCE
OF THE INDEX.
 
**SALOMON BROTHERS 6-MONTH T-BILL INDEX IS AN UNMANAGED INDEX BASED ON 
THE AVERAGE MONTHLY YIELD OF A 6- MONTH TREASURY BILL. RATES OF TREASURY
OBLIGATIONS ARE FIXED AT ISSUANCE, AND PAYMENT OF PRINCIPAL AND INTEREST IS
BACKED BY THE U.S. TREASURY. MARKET VALUE WILL GENERALLY FLUCTUATE INVERSELY
WITH INTEREST RATES PRIOR TO MATURITY AND WILL EQUAL PAR AT MATURITY. DUE TO
THEIR SHORT MATURITIES, TREASURY BILLS EXPERIENCE VERY LOW MARKET VOLATILITY.
 
+THE LEHMAN BROTHERS ADJUSTABLE RATE INDEX IS A BROAD MARKET CAPITALIZATION
INDEX OF THE AGENCY ADJUSTABLE RATE MORTGAGE MARKET. ALL SECURITIES IN THE INDEX
HAVE RATES THAT PERIODICALLY ADJUST BASED ON A SPREAD OVER A PUBLISHED INDEX,
AND ALL ARE GOVERNMENT AGENCY GUARANTEED. SOURCE IS LEHMAN BROTHERS.
 
++THE CONSUMER PRICE INDEX IS A STATISTICAL MEASURE OF CHANGE, OVER TIME, IN THE
PRICES OF GOODS AND SERVICES IN MAJOR EXPENDITURE GROUPS FOR ALL URBAN
CONSUMERS. IT IS GENERALLY CONSIDERED TO BE A MEASURE OF INFLATION. SOURCE IS
TOWERS DATA SYSTEMS.


                                                                               7
<PAGE>   8
PERFORMANCE UPDATE
 
- --------------------------------------------------------------------------------
Kemper Adjustable Rate U.S. Government Fund Class C
- --------------------------------------------------------------------------------
Growth of an assumed $10,000 investment in
Class C shares from 5/31/94 to 8/31/98
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                             Kemper Adjustable Rate
            Measurement Period                U.S. Government Fund       Lehman Brothers           Consumer Price
           (Fiscal Year Covered)                    Class C(1)        Adjustable Rate Index+           Index++
<S>                                          <C>                      <C>                      <C>
5/31/94                                              10000                    10000                    10000
                                                     10019                    10022                    10034
                                                     10007                    10091                    10129
                                                      9973                    10107                    10149
                                                     10252                    10529                    10264
                                                     10449                    10858                    10339
                                                     10569                    11041                    10386
                                                     10750                    11289                    10407
                                                     10773                    11414                    10556
                                                     10869                    11543                    10624
                                                     11023                    11759                    10698
12/31/96                                             11180                    12046                    10753
                                                     11311                    12207                    10847
                                                     11502                    12460                    10868
                                                     11670                    12703                    10929
12/31/97                                             11779                    12878                    10936
                                                     11828                    13080                    10997
                                                     11924                    13265                    11051
8/31/98                                              11954                    13386                    11064
</TABLE>
 
(Note: please see page seven for footnote information)

PORTFOLIO STATISTICS
 
PORTFOLIO COMPOSITION*
 
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                        ON 8/31/98              ON 8/31/97
- --------------------------------------------------------------------------------
<S>                                  <C>                     <C>        
    GOVERNMENT AGENCIES ARMs                70%                     91%
- --------------------------------------------------------------------------------
    FIXED RATE AGENCY SECURITIES            11                       1
- --------------------------------------------------------------------------------
    GOVERNMENT BONDS:
- --------------------------------------------------------------------------------
      SHORT-TERM                             1                       8
- --------------------------------------------------------------------------------
      INTERMEDIATE-TERM                      5                      --
- --------------------------------------------------------------------------------
    CASH EQUIVALENTS                        10                      --
- --------------------------------------------------------------------------------
    CORPORATES                               3                      --
- --------------------------------------------------------------------------------
                                           100%                    100%
</TABLE>
 
                                    [PIE CHART]               [PIE CHART]
                                    ON 8/31/98                ON 8/31/97
 
AVERAGE MATURITY
 
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                    ON 8/31/98                ON 8/31/97
- --------------------------------------------------------------------------------
<S>                             <C>                       <C>          
    AVERAGE MATURITY                2.9 years                 3.6 years
- --------------------------------------------------------------------------------
</TABLE>
 
*Portfolio composition and holdings are subject to change.
 
 8
 
<PAGE>   9
PORTFOLIO OF INVESTMENTS
 
KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND
Portfolio of Investments at August 31, 1998
(DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------- 
                                                                                INTEREST                 PRINCIPAL
    U.S. GOVERNMENT OBLIGATIONS                       TYPE                        RATE        MATURITY    AMOUNT      VALUE
- --------------------------------------------------------------------------------------------------------------------------- 
<S>                                  <C>                                    <C>              <C>        <C>         <C>
    GOVERNMENT NATIONAL              Adjustable rate mortgages(a)           6.875     %        2021      $ 1,831    $ 1,870
    MORTGAGE ASSOCIATION                                                    6.875-7.375        2022        5,669      5,779
    - 39.3%                                                                 6.875              2023        1,202      1,226
    (Cost: $27,291)                                                          7.00              2027        4,289      4,364
                                                                             6.00              2028        7,659      7,736 
                                     Pass-through certificates               6.50              2013        2,750      2,796 
                                                                            11.00              2018          270        300 
                                                                             9.00              2022        2,938      3,142 
                                     -------------------------------------------------------------------------------------- 
                                                                                                                     27,213 
- ---------------------------------------------------------------------------------------------------------------------------
    FEDERAL HOME LOAN                Adjustable rate mortgages(a)           7.492-7.856        2022       11,909     12,149
    MORTGAGE CORPORATION                                                    7.545-7.564        2023        4,441      4,517
    - 29.2%                                                                 7.731              2025        3,494      3,583
    (Cost: $20,417)                  Fixed rate collateralized                                                             
                                     mortgage obligation                    11.00              2014            7          7 
                                     -------------------------------------------------------------------------------------- 
                                                                                                                     20,256 
- --------------------------------------------------------------------------------------------------------------------------- 
    FEDERAL NATIONAL                 Adjustable rate mortgages(a)           7.124              2019        2,555      2,609
    MORTGAGE ASSOCIATION                                                     7.53              2021        1,167      1,188
    - 11.8%                                                                  7.64              2023        1,423      1,449
    (Cost: $8,259)                                                          7.585              2025        1,556      1,574
                                     Fixed rate collateralized                                                              
                                     mortgage obligation                     9.25              2018        1,257      1,338 
                                     -------------------------------------------------------------------------------------- 
                                                                                                                      8,158 
- --------------------------------------------------------------------------------------------------------------------------- 
    U.S. TREASURY                    Notes                                  8.875              2000          500        531
    SECURITIES - 5.4%                                                        7.50              2002        3,000      3,247
                                     -------------------------------------------------------------------------------------- 
                                                                                                                            
                                                                                                                      3,778 
    (Cost: $3,779)                   -------------------------------------------------------------------------------------- 
                                     TOTAL U.S. GOVERNMENT OBLIGATIONS--85.7%                                               
                                     (Cost: $59,746)                                                                 59,405 
                                     -------------------------------------------------------------------------------------- 
- --------------------------------------------------------------------------------------------------------------------------- 
    CORPORATE                        Deutsche Floorplan                                                                    
    OBLIGATIONS - 4.0%               Receivables Master Trust               5.856              2001        1,400      1,401
    (Cost: $2,805)                   MBNA Master Credit Card Trust          5.826              2003        1,400      1,403
                                     -------------------------------------------------------------------------------------- 
                                                                                                                      2,804 
- --------------------------------------------------------------------------------------------------------------------------- 
    MONEY MARKET                     Yield--5.43%                                                                          
    INSTRUMENTS - 7.1%               Due--September 1998                                                                   
    (Cost: $4,900)                   Federal National Mortgage Association                                 4,900      4,900
                                     -------------------------------------------------------------------------------------- 
                                     TOTAL INVESTMENTS--96.8%                                                               
                                     (Cost: $67,451)                                                                 67,109 
                                     -------------------------------------------------------------------------------------- 
                                     CASH AND OTHER ASSETS, LESS LIABILITIES--3.2%                                    2,198 
                                     -------------------------------------------------------------------------------------- 
                                     NET ASSETS--100%                                                               $69,307 
                                     -------------------------------------------------------------------------------------- 
</TABLE>
- --------------------------------------------------------------------------------
 NOTES TO PORTFOLIO OF INVESTMENTS
- --------------------------------------------------------------------------------
(a) Adjustable rate securities. The interest rates on these securities vary with
a selected index at specified intervals and the rates shown above are the
effective rates on August 31, 1998. The dates shown represent the final maturity
of the obligations.
 
Based on the cost of investments of $67,451,000 for federal income tax purposes
at August 31, 1998, the gross unrealized appreciation was $19,000, the gross
unrealized depreciation was $361,000 and the net unrealized depreciation on
investments was $342,000.
 
See accompanying Notes to Financial Statements.
 




                                                                               9
 

<PAGE>   10

REPORT OF INDEPENDENT AUDITORS 
 
THE BOARD OF TRUSTEES AND SHAREHOLDERS
KEMPER ADJUSTABLE RATE U.S. GOVERNMENT FUND
 
  We have audited the accompanying statement of assets and liabilities,
including the portfolio of investments, of Kemper Adjustable Rate U.S.
Government Fund as of August 31, 1998, the related statement of operations for
the year then ended, the statement of changes in net assets for each of the two
years in the period then ended, and the financial highlights for each of the
fiscal periods since 1994. These financial statements and financial highlights
are the responsibility of the Fund's management. Our responsibility is to
express an opinion on these financial statements and financial highlights based
on our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of investments owned as of
August 31, 1998, by correspondence with the custodian. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
  In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of Kemper
Adjustable Rate U.S. Government Fund at August 31, 1998, the results of its
operations for the year then ended, the changes in its net assets for each of
the two years in the period then ended, and the financial highlights for each of
the fiscal periods since 1994, in conformity with generally accepted accounting
principles.
 
                                                               ERNST & YOUNG LLP
 
                                          Chicago, Illinois 
                                          October 16, 1998
 
 10
 
                                          
<PAGE>   11

FINANCIAL STATEMENTS

STATEMENT OF ASSETS AND LIABILITIES
 
August 31, 1998
(IN THOUSANDS)
 
<TABLE>
<S>                                                             <C>
- ------------------------------------------------------------------------
 ASSETS
- ------------------------------------------------------------------------
Investments, at value
(Cost: $67,451)                                                 $ 67,109
- ------------------------------------------------------------------------
Cash                                                                 412
- ------------------------------------------------------------------------
Receivable for:
  Fund shares sold                                                   450
- ------------------------------------------------------------------------
  Investments sold                                                 1,151
- ------------------------------------------------------------------------
  Interest                                                           552
- ------------------------------------------------------------------------
    TOTAL ASSETS                                                  69,674
- ------------------------------------------------------------------------

- ------------------------------------------------------------------------
 LIABILITIES AND NET ASSETS
- ------------------------------------------------------------------------

Payable for:
  Dividends                                                           67
- ------------------------------------------------------------------------
  Fund shares redeemed                                               176
- ------------------------------------------------------------------------
  Management fee                                                      32
- ------------------------------------------------------------------------
  Distribution services fee                                            5
- ------------------------------------------------------------------------
  Administrative services fee                                         12
- ------------------------------------------------------------------------
  Custodian and transfer agent fees and related expenses              42
- ------------------------------------------------------------------------
  Trustees' fees                                                      33
- ------------------------------------------------------------------------
    Total liabilities                                                367
- ------------------------------------------------------------------------
NET ASSETS                                                      $ 69,307
- ------------------------------------------------------------------------

- ------------------------------------------------------------------------
 ANALYSIS OF NET ASSETS
- ------------------------------------------------------------------------

Paid-in capital                                                 $ 79,561
- ------------------------------------------------------------------------
Accumulated net realized loss on investments                      (9,912)
- ------------------------------------------------------------------------
Net unrealized depreciation on investments                          (342)
- ------------------------------------------------------------------------
NET ASSETS APPLICABLE TO SHARES OUTSTANDING                     $ 69,307
- ------------------------------------------------------------------------
 THE PRICING OF SHARES
- ------------------------------------------------------------------------

CLASS A SHARES
  Net asset value and redemption price per share
  ($60,856 / 7,431 shares outstanding)                             $8.19
- ------------------------------------------------------------------------
  Maximum offering price per share
  (net asset value, plus 3.63% of
  net asset value or 3.50% of offering price)                      $8.49
- ------------------------------------------------------------------------
CLASS B SHARES
  Net asset value and redemption price
  (subject to contingent deferred sales charge) per share
  ($7,108 / 865 shares outstanding)                                $8.21
- ------------------------------------------------------------------------
CLASS C SHARES
  Net asset value and redemption price per share
  (subject to contingent deferred sales charge) per share
  ($1,343 / 163 shares outstanding)                                $8.22
- ------------------------------------------------------------------------
</TABLE>
 
See accompanying Notes to Financial Statements.
 
                                                                             11
 

<PAGE>   12
FINANCIAL STATEMENTS
 
STATEMENT OF OPERATIONS
 
Year ended August 31, 1998
 (IN THOUSANDS)
 
<TABLE>
<S>                                                             <C>
- ----------------------------------------------------------------------
NET INVESTMENT INCOME
- ----------------------------------------------------------------------
Interest income                                                 $4,646
- ----------------------------------------------------------------------
Expenses:
  Management fee                                                   415
- ----------------------------------------------------------------------
  Distribution services fee                                         63
- ----------------------------------------------------------------------
  Administrative services fee                                      161
- ----------------------------------------------------------------------
  Custodian and transfer agent fees and related expenses           298
- ----------------------------------------------------------------------
  Professional fees                                                 43
- ----------------------------------------------------------------------
  Reports to shareholders                                           84
- ----------------------------------------------------------------------
  Trustees' fees and other                                          18
- ----------------------------------------------------------------------
    Total expenses                                               1,082
- ----------------------------------------------------------------------
NET INVESTMENT INCOME                                            3,564
- ----------------------------------------------------------------------

- ----------------------------------------------------------------------
 NET REALIZED AND UNREALIZED LOSS ON INVESTMENTS
- ----------------------------------------------------------------------

  Net realized loss on sales of investments (including
  options purchased)                                              (137)
- ----------------------------------------------------------------------
  Net realized loss from futures transactions                      (81)
- ----------------------------------------------------------------------
    Net realized loss                                             (218)
- ----------------------------------------------------------------------
  Change in net unrealized depreciation on investments            (589)
- ----------------------------------------------------------------------
Net loss on investments                                           (807)
- ----------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS            $2,757
- ----------------------------------------------------------------------
</TABLE>
 
STATEMENT OF CHANGES IN NET ASSETS
 
(IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                   YEAR ENDED AUGUST 31,
                                                                  1998                1997
- --------------------------------------------------------------------------------------------
 OPERATIONS, DIVIDENDS AND CAPITAL SHARE ACTIVITY
- --------------------------------------------------------------------------------------------
<S>                                                             <C>                  <C>
  Net investment income                                           $ 3,564              4,875
- --------------------------------------------------------------------------------------------
  Net realized gain (loss)                                           (218)               522
- --------------------------------------------------------------------------------------------
  Change in net unrealized appreciation/depreciation                 (589)               341
- --------------------------------------------------------------------------------------------
Net increase in net assets resulting from operations                2,757              5,738
- --------------------------------------------------------------------------------------------
Net equalization charges                                               --               (127)
- --------------------------------------------------------------------------------------------
Distribution from net investment income                            (3,759)            (4,810)
- --------------------------------------------------------------------------------------------
Net decrease from capital share transactions                      (11,658)           (13,311)
- --------------------------------------------------------------------------------------------
TOTAL DECREASE IN NET ASSETS                                      (12,660)           (12,510)
- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------
 NET ASSETS
- --------------------------------------------------------------------------------------------

Beginning of year                                                  81,967             94,477
- --------------------------------------------------------------------------------------------
END OF YEAR (including undistributed
net investment income of
$657 for 1997)                                                    $69,307             81,967
- --------------------------------------------------------------------------------------------
</TABLE>
 
 12
 
   

<PAGE>   13

FINANCIAL STATEMENTS

- --------------------------------------------------------------------------------
1    DESCRIPTION OF THE
     FUND                    Kemper Adjustable Rate U.S. Government Fund is an
                             open-end management investment company organized as
                             a business trust under the laws of Massachusetts.
                             The Fund offers four classes of shares. Class A
                             shares are sold to investors subject to an initial
                             sales charge. Class B shares are sold without an
                             initial sales charge but are subject to higher
                             ongoing expenses than Class A shares and a
                             contingent deferred sales charge payable upon
                             certain redemptions. Class B shares automatically
                             convert to Class A shares six years after issuance.
                             Class C shares are sold without an initial sales
                             charge but are subject to higher ongoing expenses
                             than Class A shares and a contingent deferred sales
                             charge payable upon certain redemptions within one
                             year of purchase. Class C Shares do not convert
                             into another class. Class I shares (none sold
                             through August 31, 1998) are offered to a limited
                             group of investors, are not subject to initial or
                             contingent deferred sales charges and have lower
                             ongoing expenses than other classes. Differences in
                             class expenses will result in the payment of
                             different per share income dividends by class. All
                             shares of the Fund have equal rights with respect
                             to voting, dividends and assets, subject to class
                             specific preferences.
 
- --------------------------------------------------------------------------------
2    SIGNIFICANT
     ACCOUNTING POLICIES     SECURITY VALUATION. Portfolio debt securities with
                             remaining maturities greater than sixty days are
                             valued by pricing agents approved by the officers
                             of the Fund, which quotations reflect
                             broker/dealer-supplied valuations and electronic
                             data processing techniques. If the pricing agents
                             are unable to provide such quotations, the most
                             recent bid quotation supplied by a bona fide market
                             maker shall be used. An exchange-traded options
                             contract on securities, futures and other financial
                             instruments is valued at its most recent sale price
                             on such exchange. Lacking any sales, the options
                             contract is valued at the Calculated Mean. Lacking
                             any Calculated Mean, the options contract is valued
                             at the most recent bid quotation in the case of a
                             purchased options contract, or the most recent
                             asked quotation in the case of a written options
                             contract. An options contract on securities and
                             other financial instruments traded over-the-counter
                             is valued at the most recent bid quotation in the
                             case of a purchased options contract and at the
                             most recent asked quotation in the case of a
                             written options contract. Futures contracts are
                             valued at the most recent settlement price. All
                             other securities are valued at their fair value as
                             determined in good faith by the Valuation Committee
                             of the Board of Trustees.
 
                             INVESTMENT TRANSACTIONS AND INVESTMENT
                             INCOME. Investment 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 and includes discount amortization on
                             all fixed income securities and premium
                             amortization on mortgage-backed securities.
                             Realized gains and losses from investment
                             transactions are reported on an identified cost
                             basis.
 
                             FUND SHARE VALUATION. Fund shares are sold and
                             redeemed on a continuous basis at net asset value
                             (plus an initial sales charge on most sales of
                             Class A shares). Proceeds payable on redemption of
                             Class B and Class C shares will be reduced by the
                             amount of any applicable contingent deferred sales
                             charge. On each day the New York Stock Exchange is
                             open for trading, the net asset value per share is
                             determined as of the close of the Exchange. The net
                             asset value per share is determined separately for
                             each class by dividing the Fund's net assets
                             attributable to that class by the number of shares
                             of the class outstanding.
 
                                                                              13
 


<PAGE>   14
NOTES TO FINANCIAL STATEMENTS

                             FEDERAL INCOME TAXES. The Fund's policy is to
                             comply with the requirements of the Internal
                             Revenue Code, as amended, which are applicable to
                             regulated investment companies, and to distribute
                             all of its taxable income to its shareholders.
                             Accordingly, the Fund paid no federal income taxes
                             and no federal income tax provision was required.
 
                             At August 31, 1998, the Fund had a net tax basis
                             loss carryforward of approximately $9,652,000,
                             which may be applied against any realized net
                             taxable gains of each succeeding year until fully
                             utilized or it will expire during the period 1999
                             through 2006. In addition, from November 1, 1997
                             through August 31, 1998 the Fund incurred
                             approximately $125,000 of net realized capital
                             losses. As permitted by tax regulations, the Fund
                             intends to elect to defer these losses and treat
                             them as arising in the fiscal year ended August 31,
                             1999.
 
                             DIVIDENDS TO SHAREHOLDERS. The Fund declares and
                             pays dividends of net investment income monthly and
                             any net realized capital gains annually, which are
                             recorded on the ex-dividend date. Dividends are
                             determined in accordance with income tax principles
                             which may treat certain transactions differently
                             than generally accepted accounting principles.
 
                             EQUALIZATION ACCOUNTING. Prior to September 1,
                             1997, the Fund used equalization accounting to keep
                             a continuing shareholder's per share interest in
                             undistributed net investment income unaffected by
                             shareholder activity. This was accomplished by
                             allocating a portion of the proceeds from sales and
                             the cost of redemptions of fund shares to
                             undistributed net investment income. As of
                             September 1, 1997, the Fund discontinued using
                             equalization. This change has no effect on the
                             Fund's net assets, net asset value per share or
                             distributions to shareholders. Discontinuing the
                             use of equalization accounting will result in
                             simpler financial statements. The cumulative effect
                             of the discontinuance of equalization accounting
                             was to decrease undistributed net investment income
                             and increase paid-in-capital previously reported
                             through August 31, 1997 by $749,000.
 
- --------------------------------------------------------------------------------
                    
3    TRANSACTIONS            MANAGEMENT AGREEMENT. The Fund has a management
     WITH AFFILIATES         agreement with Scudder Kemper Investments, Inc.
                             (Scudder Kemper), and pays a monthly investment
                             management fee of 1/12 of the annual rate of .55%
                             of the first $250 million of average daily net
                             assets declining to .40% of average daily net
                             assets in excess of $12.5 billion. The Fund
                             incurred a management fee of $415,000 for the year
                             ended August 31, 1998.
 
                             ZURICH/B.A.T MERGER. On September 7, 1998, Zurich
                             Insurance Company (Zurich), majority owner of
                             Scudder Kemper, entered into an agreement with
                             B.A.T Industries p.l.c. (B.A.T) pursuant to which
                             the financial services businesses of B.A.T were
                             combined with Zurich's businesses to form a new
                             global insurance and financial services company
                             known as Zurich Financial Services. Upon
                             consummation of the transaction, the Fund's
                             investment management agreement with Scudder Kemper
                             was deemed to have been assigned and, therefore,
                             terminated. The Board of Trustees of the Fund has
                             approved a new investment management agreement with
                             Scudder Kemper, which is substantially identical to
                             the former investment management agreement, except
                             for the dates of execution and termination. The
                             Board of Trustees of the Fund will seek
 
 14
 
   
<PAGE>   15
NOTES TO FINANCIAL STATEMENTS

                             shareholder approval of the new investment
                             management agreement through a proxy solicitation
                             that is currently scheduled to conclude in
                             mid-December.
 
                             UNDERWRITING AND DISTRIBUTION SERVICES AGREEMENT.
                             The Fund has an underwriting and distribution
                             services agreement with Kemper Distributors, Inc.
                             (KDI). Underwriting commissions paid in connection
                             with the distribution of Class A shares are as
                             follows:
 
<TABLE>
<CAPTION>                    
                                                                      COMMISSIONS
                                                                       RETAINED     COMMISSIONS ALLOWED
                                                                        BY KDI        BY KDI TO FIRMS
                                                                      -----------   --------------------
                             <S>                                      <C>           <C>
                             Year ended August 31, 1998                 $8,000             91,000
</TABLE>
 
                             For services under the distribution services
                             agreement, the Fund pays KDI a fee of .75% of
                             average daily net assets of the Class B and Class C
                             shares pursuant to separate 12b-1 plans for the
                             Class B and Class C shares. Pursuant to the
                             agreement, KDI enters into related selling group
                             agreements with various firms at various rates for
                             sales of Class B and Class C shares. In addition,
                             KDI receives any contingent deferred sales charges
                             (CDSC) from redemptions of Class B and Class C
                             shares. Distribution fees, CDSC and commissions
                             related to Class B and Class C shares are as
                             follows:
 
<TABLE>
<CAPTION>
                                                                                         COMMISSIONS AND
                                                                  DISTRIBUTION FEES     DISTRIBUTION FEES
                                                                      AND CDSC             PAID BY KDI
                                                                   RECEIVED BY KDI          TO FIRMS
                                                                  -----------------   ---------------------
                             <S>                                  <C>                 <C>
                             Year ended August 31, 1998                $94,000               92,000
</TABLE>
 
                             ADMINISTRATIVE SERVICES AGREEMENT. The Fund has an
                             administrative services agreement with KDI. For
                             providing information and administrative services
                             to Class A, Class B and Class C shareholders, the
                             Fund pays KDI a fee at an annual rate of up to .25%
                             of average daily net assets of each class. KDI in
                             turn has various agreements with financial services
                             firms that provide these services and pays these
                             firms based on assets of Fund accounts the firms
                             service. Administrative services fees (ASF) paid
                             are as follows:
 
<TABLE>
<CAPTION>
                                                                     ASF PAID BY       ASF PAID BY KDI
                                                                   THE FUND TO KDI        TO FIRMS
                                                                  -----------------   -----------------
                             <S>                                  <C>                 <C>
                             Year ended August 31, 1998               $161,000             165,000
</TABLE>
 
                             SHAREHOLDER SERVICES AGREEMENT. Pursuant to a
                             services agreement with the Fund's transfer agent,
                             Kemper Service Company (KSvC) is the shareholder
                             service agent of the Fund. Under the agreement,
                             KSvC received shareholder services fees of $234,000
                             for the year ended August 31, 1998.
 
                             OFFICERS AND TRUSTEES. Certain officers or trustees
                             of the Fund are also officers or directors of
                             Scudder Kemper. For the year ended August 31, 1998,
                             the Fund made no direct payments to its officers
                             and incurred trustees' fees of $14,000 to
                             independent trustees.
 
- --------------------------------------------------------------------------------
4    INVESTMENT              For the year ended August 31, 1998, investment
     TRANSACTIONS            transactions (excluding short-term instruments) are
                             as follows (in thousands):
 
                             Purchases                                  $114,638
 
                             Proceeds from sales                         145,699
 
                                                                              15
 


<PAGE>   16
NOTES TO FINANCIAL STATEMENTS

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

5    CAPITAL SHARE           
     TRANSACTIONS            The following table summarizes the activity in
                             capital shares of the Fund (in thousands):
 
<TABLE>
<CAPTION>
                                                                                YEAR ENDED AUGUST 31,
                                                                      1998                              1997
                                                              ---------------------           --------------------
                                                              SHARES        AMOUNT            SHARES        AMOUNT
                                        --------------------------------------------------------------------------
                                       <S>                    <C>          <C>                <C>          <C>     
                                        SHARES SOLD
                                        Class A               1,939       $ 15,939            1,089       $  8,931
                                       ---------------------------------------------------------------------------
                                        Class B                 540          4,466              626          5,196
                                       ---------------------------------------------------------------------------
                                        Class C                 172          1,427               82            680
                                       ---------------------------------------------------------------------------
                                       --------------------------------------------------------------------------
                                        SHARES ISSUED IN REINVESTMENT OF DIVIDENDS
                                        Class A                 296          2,440              369          3,054
                                       ---------------------------------------------------------------------------
                                        Class B                  32            261               33            271
                                       ---------------------------------------------------------------------------
                                        Class C                   7             56                7             55
                                       ---------------------------------------------------------------------------
                                       --------------------------------------------------------------------------
                                        SHARES REDEEMED
                                        Class A               (3,734)      (30,799)          (3,198)       (26,282)
                                       ---------------------------------------------------------------------------
                                        Class B                 (516)       (4,267)            (523)        (4,338)
                                       ---------------------------------------------------------------------------
                                        Class C                 (143)       (1,181)            (106)          (878)
                                       ---------------------------------------------------------------------------
                                       --------------------------------------------------------------------------
                                        CONVERSION OF SHARES
                                        Class A                   81           669               11             93
                                       ---------------------------------------------------------------------------
                                        Class B                  (81)         (669)             (11)           (93)
                                       ---------------------------------------------------------------------------
                                        NET DECREASE FROM
                                        CAPITAL SHARE TRANSACTIONS        $(11,658)                       $(13,311)
                                       ---------------------------------------------------------------------------
</TABLE>
 
 16
 
                                                                          
<PAGE>   17
FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                                 ---------------------------------------
                                                                 CLASS A
                                                 ---------------------------------------
                                                          YEAR ENDED AUGUST 31,
                                                 1998    1997   1996   1995   1994
- ----------------------------------------------------------------------------------------
<S>                                              <C>     <C>    <C>    <C>    <C>   
- ----------------------------------------------------------------------------------------
 PER SHARE OPERATING PERFORMANCE
- ----------------------------------------------------------------------------------------
Net asset value, beginning of year               $8.31   8.22   8.30   8.33   8.68
- ----------------------------------------------------------------------------------------
Income from investment operations:
  Net investment income                            .41    .45    .46   .48     .34
- ----------------------------------------------------------------------------------------
  Net realized and unrealized gain (loss)         (.11)   .09   (.09)  (.04)  (.29)
- ----------------------------------------------------------------------------------------
Total from investment operations                   .30    .54    .37   .44     .05
- ----------------------------------------------------------------------------------------
Less distribution from net investment income       .42    .45    .45   .47     .40
- ----------------------------------------------------------------------------------------
Net asset value, end of year                     $8.19   8.31   8.22   8.30   8.33
- ----------------------------------------------------------------------------------------
TOTAL RETURN                                      3.68%  6.75   4.55   5.52    .59
- ----------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS
- ----------------------------------------------------------------------------------------
Expenses                                          1.36%  1.25   1.15   1.10    .93
- ----------------------------------------------------------------------------------------
Net investment income                             4.79%  5.50   5.49   5.76   3.96
- ----------------------------------------------------------------------------------------
</TABLE>
 
<TABLE>
<CAPTION>
                                                 ---------------------------------------
                                                                 CLASS B
                                                 ---------------------------------------
                                                        YEAR ENDED            MAY 31 TO
                                                        AUGUST 31,            AUGUST 31,
                                                 1998    1997   1996   1995     1994
- ----------------------------------------------------------------------------------------
<S>                                              <C>     <C>    <C>    <C>    <C>
- ----------------------------------------------------------------------------------------
 PER SHARE OPERATING PERFORMANCE
- ----------------------------------------------------------------------------------------
Net asset value, beginning of period             $8.32   8.23   8.31   8.32      8.37
- ----------------------------------------------------------------------------------------
Income from investment operations:
  Net investment income                            .36    .39    .40    .43       .07
- ----------------------------------------------------------------------------------------
  Net realized and unrealized gain (loss)         (.11)   .09   (.09)  (.04)     (.04)
- ----------------------------------------------------------------------------------------
Total from investment operations                   .25    .48    .31    .39       .03
- ----------------------------------------------------------------------------------------
Less distribution from net investment income       .36    .39    .39    .40       .08
- ----------------------------------------------------------------------------------------
Net asset value, end of period                   $8.21   8.32   8.23   8.31      8.32
- ----------------------------------------------------------------------------------------
TOTAL RETURN (NOT ANNUALIZED)                     3.06%  5.96   3.79   4.84       .34
- ----------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS (ANNUALIZED)
- ----------------------------------------------------------------------------------------
Expenses                                          1.99%  1.93   1.89   1.85      1.96
- ----------------------------------------------------------------------------------------
Net investment income                             4.16%  4.82   4.75   5.01      3.36
- ----------------------------------------------------------------------------------------
</TABLE>
 
                                                                              17
 

 
<PAGE>   18
FINANCIAL HIGHLIGHTS

 
<TABLE>
<CAPTION>
                                                 -------------------------------------------
                                                                   CLASS C
                                                 -------------------------------------------
                                                                                MAY 31 TO
                                                   YEAR ENDED AUGUST 31,        AUGUST 31,     
                                                 1998    1997   1996   1995      1994
- --------------------------------------------------------------------------------------------
<S>                                              <C>     <C>    <C>    <C>    <C>        
 PER SHARE OPERATING PERFORMANCE
- --------------------------------------------------------------------------------------------
Net asset value, beginning of period             $8.33   8.24   8.32   8.33       8.37
- --------------------------------------------------------------------------------------------
Income from investment operations:
  Net investment income                            .36    .39    .40    .43        .08
- --------------------------------------------------------------------------------------------
  Net realized and unrealized gain (loss)         (.11)   .09   (.09)  (.04)      (.04)
- --------------------------------------------------------------------------------------------
Total from investment operations                   .25    .48    .31    .39        .04
- --------------------------------------------------------------------------------------------
Less distribution from net investment income       .36    .39    .39    .40        .08
- --------------------------------------------------------------------------------------------
Net asset value, end of period                   $8.22   8.33   8.24   8.32       8.33
- --------------------------------------------------------------------------------------------
TOTAL RETURN (NOT ANNUALIZED)                     3.10%  5.98   3.82   4.89        .47
- --------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS (ANNUALIZED)
- --------------------------------------------------------------------------------------------
Expenses                                          1.95%  1.88   1.89   1.79       1.88
- --------------------------------------------------------------------------------------------
Net investment income                             4.20%  4.87   4.75   5.07       3.52
- --------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

- ----------------------------------------------------------------------------------------------------
 SUPPLEMENTAL DATA FOR ALL CLASSES
- ----------------------------------------------------------------------------------------------------
                                                                 YEAR ENDED AUGUST 31,
                                                  1998      1997     1996     1995      1994
- ----------------------------------------------------------------------------------------------------
<S>                                              <C>       <C>      <C>      <C>       <C>       
Net assets at end of year (in thousands)         $69,307   81,967   94,477   129,757   202,815
- ----------------------------------------------------------------------------------------------------
Portfolio turnover rate                              149%     249      272       308       533
- ----------------------------------------------------------------------------------------------------
</TABLE>
 
NOTES: Scudder Kemper had agreed to absorb certain operating expenses during a
portion of the year ended August 31, 1994. Without this agreement, the ratios of
expenses and net investment income to average net assets for Class A shares
would have been .99% and 3.90%, respectively, for the year ended August 31,
1994.
 
Total return does not reflect the effect of any sales charges.
 
 TAX INFORMATION
 
Please consult a tax adviser if you have questions about federal or state income
tax laws, or on how to prepare your tax returns. If you have specific questions
about your Kemper Fund account, please call 1-800-621-1048.
 
 18
 
                                                        
 
                           


<PAGE>   19

NOTES












                                                                              19
<PAGE>   20
TRUSTEES AND OFFICERS
 
<TABLE>
<CAPTION>
TRUSTEES                          OFFICERS
<S>                               <C>                       <C> 
DANIEL PIERCE                     MARK S. CASADY            RICHARD L. VANDENBERG
Chairman and Trustee              President                 Vice President

DAVID W. BELIN                    PHILLIP J. COLLORA        LINDA J. WONDRACK
Trustee                           Vice President and        Vice President
                                  Secretary
LEWIS A. BURNHAM                                            MAUREEN E. KANE
Trustee                           JOHN R. HEBBLE            Assistant Secretary
                                  Treasurer
DONALD L. DUNAWAY                                           CAROLINE PEARSON
Trustee                           JERARD K. HARTMAN         Assistant Secretary
                                  Vice President
ROBERT B. HOFFMAN                                           ELIZABETH C. WERTH
Trustee                           THOMAS W. LITTAUER        Assistant Secretary
                                  Vice President
DONALD R. JONES                                             BRENDA LYONS
Trustee                           ANN M. MCCREARY           Assistant Treasurer
                                  Vice President
SHIRLEY D. PETERSON
Trustee                           ROBERT C. PECK, JR.
                                  Vice President
WILLIAM P. SOMMERS
Trustee                           KATHRYN L. QUIRK
                                  Vice President
EDMOND D. VILLANI
Trustee                         
</TABLE>                                

- --------------------------------------------------------------------------------
LEGAL COUNSEL              VEDDER, PRICE, KAUFMAN & KAMMHOLZ
                           222 North LaSalle Street
                           Chicago, IL 60601

- --------------------------------------------------------------------------------
SHAREHOLDER                KEMPER SERVICE COMPANY
SERVICE AGENT              P.O. Box 419557
                           Kansas City, MO 64141

- --------------------------------------------------------------------------------
CUSTODIAN AND              INVESTORS FIDUCIARY TRUST COMPANY
TRANSFER AGENT             801 Pennsylvania Avenue
                           Kansas City, MO 64105

- --------------------------------------------------------------------------------
INDEPENDENT                ERNST & YOUNG LLP
AUDITORS                   233 South Wacker Drive
                           Chicago, IL 60606

- --------------------------------------------------------------------------------
PRINCIPAL UNDERWRITER      KEMPER DISTRIBUTORS, INC.
                           222 South Riverside Plaza  Chicago, IL 60606
                           www.kemper.com
 
[KEMPER LOGO]
LONG-TERM INVESTING IN A SHORT-TERM WORLD(SM)

Printed on recycled paper in the U.S.A.
This report is not to be distributed
unless preceded or accompanied by a
Kemper Fixed Income Funds prospectus.
KARGF - 2 (10/98) 1057590
 
                                  
 



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