KEMPER PORTFOLIOS
N-30D, 1999-06-01
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<PAGE>   1

                                                            SEMIANNUAL REPORT TO
                                                     SHAREHOLDERS FOR THE PERIOD
                                                            ENDED MARCH 31, 1999


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

[MORNINGSTAR RATINGS LOGO]

OFFERING INVESTORS THE OPPORTUNITY FOR MAXIMUM CURRENT RETURN
FROM A PORTFOLIO OF U.S. GOVERNMENT SECURITIES

KEMPER
U.S. MORTGAGE FUND

              "... After the outsized moves of the last 18 months,
               we're returning to a more normal atmosphere. ..."


                                                             [KEMPER FUNDS LOGO]


<PAGE>   2
CONTENTS
3
ECONOMIC OVERVIEW
5
PERFORMANCE UPDATE
7
PORTFOLIO STATISTICS
8
PORTFOLIO OF INVESTMENTS
9
FINANCIAL STATEMENTS
11
NOTES TO FINANCIAL
STATEMENTS
15
FINANCIAL HIGHLIGHTS
17
SHAREHOLDERS' MEETING


AT A GLANCE
- --------------------------------------------------------------------------------
KEMPER U.S. MORTGAGE FUND
TOTAL RETURNS
- --------------------------------------------------------------------------------
FOR THE SIX-MONTH PERIOD ENDED MARCH 31, 1999
(UNADJUSTED FOR ANY SALES CHARGE)

                                  [BAR GRAPH]
- --------------------------------------------------------------------------------
<TABLE>
<S>                                             <C>
CLASS A                                         0.79
CLASS B                                         0.31
CLASS C                                         0.41
LIPPER U.S. MORTGAGE FUNDS CATEGORY AVERAGE*    0.71
- --------------------------------------------------------------------------------
</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.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
NET ASSET VALUE
- --------------------------------------------------------------------------------
                                  AS OF     AS OF
                                 3/31/99   9/30/98
- --------------------------------------------------------------------------------
<S>                               <C>       <C>
KEMPER U.S. MORTGAGE FUND
CLASS A                           $6.98     $7.15
- --------------------------------------------------------------------------------
KEMPER U.S. MORTGAGE FUND
CLASS B                           $6.97     $7.14
- --------------------------------------------------------------------------------
KEMPER U.S. MORTGAGE FUND
CLASS C                           $6.98     $7.15
- --------------------------------------------------------------------------------
</TABLE>

*LIPPER ANALYTICAL SERVICES, INC. RETURNS AND 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.

- --------------------------------------------------------------------------------
KEMPER U.S. MORTGAGE FUND
RANKINGS AS OF 3/31/99*
- --------------------------------------------------------------------------------
COMPARED TO ALL OTHER FUNDS IN THE LIPPER
U.S. MORTGAGE FUNDS CATEGORY

<TABLE>
<CAPTION>
             CLASS A            CLASS B                 CLASS C
- --------------------------------------------------------------------------------
<S>          <C>                <C>                     <C>
1-YEAR       #16 of 67 funds    #52 of 67 funds         #43 of 67 funds
- --------------------------------------------------------------------------------
5-YEAR       #18 of 50 funds    #39 of 50 funds              N/A
- --------------------------------------------------------------------------------
10-YEAR           N/A           #14 of 15 funds              N/A

- --------------------------------------------------------------------------------
</TABLE>

- --------------------------------------------------------------------------------
DIVIDEND AND YIELD REVIEW
- --------------------------------------------------------------------------------
THE FOLLOWING TABLE SHOWS PER SHARE DIVIDEND AND YIELD INFORMATION FOR THE FUND
AS OF MARCH 31, 1999.

<TABLE>
<CAPTION>
                       CLASS A  CLASS B  CLASS C
- --------------------------------------------------------------------------------
<S>                    <C>      <C>      <C>
SIX-MONTH INCOME:      $0.2250  $0.1915  $0.1985
- --------------------------------------------------------------------------------
MARCH DIVIDEND:        $0.0375  $0.0320  $0.0332
- --------------------------------------------------------------------------------
ANNUALIZED
DISTRIBUTION RATE+:     6.45%    5.51%    5.71%
- --------------------------------------------------------------------------------
SEC YIELD+:             5.30%    4.32%    4.71%
- --------------------------------------------------------------------------------
</TABLE>

+CURRENT ANNUALIZED DISTRIBUTION RATE IS THE LATEST MONTHLY DIVIDEND SHOWN AS AN
ANNUALIZED PERCENTAGE OF NET ASSET VALUE ON MARCH 31, 1999. 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 MARCH 31, 1999, SHOWN AS AN ANNUALIZED PERCENTAGE OF THE MAXIMUM
OFFERING PRICE ON THAT DATE. THE SEC YIELD IS COMPUTED IN ACCORDANCE WITH A
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 INCOME FUNDS STYLE BOX
- --------------------------------------------------------------------------------
[Morningstar Income Style Box]

SOURCE: Data provided by Morningstar, Inc., Chicago, IL 312-696-6000. The Income
Style Box placement is based on a fund's average effective maturity or duration
and the average credit rating of the bond portfolio. THE STYLE BOX REPRESENTS A
SNAPSHOT OF A FUND'S PORTFOLIO ON A SINGLE DAY. IT IS NOT AN EXACT ASSESSMENT OF
RISK AND DOES NOT REPRESENT FUTURE PERFORMANCE. THE FUND'S PORTFOLIO CHANGES
FROM DAY-TO-DAY. A LONGER-TERM VIEW IS REPRESENTED BY THE FUND'S MORNINGSTAR
CATEGORY, WHICH IS BASED ON ITS ACTUAL INVESTMENT STYLE AS MEASURED BY ITS
UNDERLYING PORTFOLIO HOLDINGS OVER THE PAST THREE YEARS. CATEGORY PLACEMENTS OF
NEW FUNDS ARE ESTIMATED. MORNINGSTAR HAS PLACED KEMPER U.S. MORTGAGE FUND IN THE
INTERMEDIATE GOVERNMENT CATEGORY. PLEASE CONSULT THE PROSPECTUS FOR A
DESCRIPTION OF INVESTMENT POLICIES.

BASIS POINT The movement of interest rates or yields expressed in hundredths of
a percent. For example, an increase in yield from 5.00 percent to 5.50 percent
is 50 basis points.

GROSS DOMESTIC PRODUCT (GDP) The market value of goods and services produced by
a country during a specified period. It acts as a useful gauge when measuring
the strength of an economy, especially when comparing different time periods.

DURATION A measure of the interest rate sensitivity of a fixed income investment
or portfolio. The longer the duration, the greater the portfolio's sensitivity
to interest rate fluctuations.

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'S DEGREE AND PH.D. IN ECONOMICS FROM NORTHEASTERN
UNIVERSITY IN BOSTON AND A MASTER'S DEGREE IN ECONOMICS FROM BROWN UNIVERSITY IN
PROVIDENCE, R.I. PRIOR TO HIS CAREER AT SCUDDER KEMPER INVESTMENTS, HE WAS WITH
THE HARRIS BANK AND ALSO TAUGHT AT INDIANA UNIVERSITY.

SCUDDER KEMPER INVESTMENTS, THE INVESTMENT MANAGER FOR KEMPER FUNDS, IS ONE OF
THE LARGEST AND MOST EXPERIENCED INVESTMENT MANAGEMENT ORGANIZATIONS IN THE
WORLD, MANAGING MORE THAN $280 BILLION IN ASSETS FOR INSTITUTIONAL AND CORPORATE
CLIENTS, RETIREMENT AND PENSION PLANS, INSURANCE COMPANIES, MUTUAL FUND
INVESTORS AND INDIVIDUALS. SCUDDER KEMPER INVESTMENTS OFFERS A FULL RANGE OF
INVESTMENT COUNSEL AND ASSET MANAGEMENT CAPABILITIES BASED ON A COMBINATION OF
PROPRIETARY RESEARCH AND DISCIPLINED, LONG-TERM INVESTMENT STRATEGIES.

DEAR KEMPER FUNDS SHAREHOLDER:

Throughout April, investor enthusiasm drove the market to its second milestone
in a year -- the Dow Jones Industrial Average rose to 11,000 just a month after
it broke 10,000 for the first time. But those gains don't tell the whole story
- -- investors in the first four months of the year have endured significant
volatility. What drove the climb to 11,000 and what, at the same time, has led
to investor anxiety?

  Driving the market, in part, was consumer confidence. In the first quarter of
1999, consumer spending surged 6.7 percent -- the largest rise in 11 years. The
market's rise seems to have buoyed consumer confidence, which rose for the sixth
consecutive month in April. And, the resilience of the economy has bolstered
more optimistic expectations for the next six months.

  Inspiring consumer confidence also were the lowest levels of inflation in a
generation. As measured by the consumer price index (CPI), inflation has been
between 1 1/2 and 2 percent, compared to approximately 4 percent in the
beginning of the 1990s and 10-12 percent in the beginning of the 1980s. Still,
inflation worries have been seeping into the market. The growing conviction that
Asian and Latin American economies are recovering is raising commodity prices,
particularly oil. The price of West Texas Intermediate oil surged from less than
$12 in February to almost $19 in early May. That alone almost guarantees a rise
in the "headline" inflation rate this year, which is the rate of inflation as
measured by the entire CPI. But it's important to note that the Federal Reserve
Board looks primarily at the core inflation rate, which is the CPI minus food
and energy -- and the core inflation rate looks as if it will remain low at
about 2 percent this year.

  Also contributing to consumer confidence, short-term and long-term interest
rates remained low over the first quarter, and can be expected to remain so.
Today's Fed policy is reactive, not proactive, which means that the Fed tends to
respond to inflation only when it picks up. Consequently, we expect no changes
in short-term interest rates during May and June, and there's only a small
chance that the Fed will raise interest rates in the second half of the year.
Moreover, the federal budget surplus continues to benefit from good revenue
gains (which are based on good income gains, especially from households), good
capital gains and continued restraint in federal spending. The surplus this year
is expected to approach $100 billion.

  Such a positive environment is exactly what poses risk for investors, and is
key to understanding recent volatility in the market. A stronger economy has the
potential to feed inflation fears and drive up interest rates. Events on April
30 illustrated the domino effect of investors reacting to positive economic
news, which they consider troubling at this point, more than eight years into
the economic expansion. The steady stream of positive economy's news prompted a
sell-off in the markets based on fears that the strong pace of economic growth
will eventually lead to higher inflation. The benchmark 30-year Treasury bond
fell nearly 2 points (close to $20 for a bond with a $1,000 face amount) as the
yield shot up to 5.657 percent. It was the biggest one-day plunge in bonds in
two months. Bonds, in turn, pulled stocks lower.

  Where can we expect to go from here? The fundamentals by which we judge the
health of the economy suggested continued growth as we moved into the second
quarter of 1999. For example, the gross domestic product (GDP), the value of all
goods and services produced in the U.S., rose at an annual rate of 4.5 percent
in the first quarter, following a tremendous fourth-quarter surge of 6 percent.
This is very much in line with what we've grown accustomed to over the past year
- -- over the four quarters of 1998, the U.S. economy expanded by 4.3 percent.
Some people aren't surprised at all by strong GDP growth that once would have
alarmed them. That's partially because we've grown accustomed to a strong
economy in the past three or four years. But it's also because we've been able
to absorb growth without driving up inflation. That's important for investors.
If prices were rising as the economy was growing, the Fed would most likely
raise short-term interest rates, which would change the financial market
outlook. But again, that isn't happening right now.

  However, we do see some vulnerability. Trade is a weak spot in the economy
right now. Exports of U.S. goods and services dropped in the first quarter while
imports soared. This reflects the fact that the U.S. is one of the few countries
financially fit enough to buy goods produced elsewhere in the world. But for as
long as less vibrant international economies are unable to buy U.S. goods, the
profitability of U.S. companies trying to export will be challenged.

  When you think about it, vulnerability in regard to the international economy
is nothing new. Globally, the outlook is slightly more positive than it was a
few months ago. For example, the European markets are slowing down, which will
most likely lead to the central bank lowering interest rates in order to boost
domestic spending. In many countries in Europe, there are no fixed-rate
mortgages, only adjustable-rate mortgages. When interest rates go down,
mortgages are reduced and homeowners



                                                                               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]

(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 MARCH 31, 1999.

SOURCE: ECONOMICS DEPARTMENT, SCUDDER KEMPER INVESTMENTS, INC.

spend money elsewhere. This has a huge impact on consumer spending, and will
help European equities in the long term. Additionally, the situation in Japan
remains unchanged. And, problems in the emerging markets haven't had the
negative impact many people expected -- both the Mexican and Brazilian stock
markets have actually risen in the past two months.
  But don't forget that international crises have the potential to affect the
U.S. markets drastically. An increase in military spending on Kosovo by the 11
European Monetary Union (EMU) countries could force them to spend less in other
areas, which could have economic implications, including higher interest rates.
That's because many European countries have small economies and little leeway in
their budgets. Consequently, those countries finance unplanned military
expenditures by selling government bonds -- which, in Europe's small bond
market, typically raises interest rates.
  The international situation alone, however, is by no means an indicator of a
U.S. slowdown -- and without any such indications, complacency may be our
greatest concern. It's easy to look at the current economic situation and behave
as if no risk exists. But when you see the market soaring and are tempted to
jump in, note that the bull market grew to records on the strength of just a few
dozen stocks, while most other stock prices were flat or actually declined.
  In summary, there are concerns that the current economy is unsustainable and
we soon could see an abrupt end. In many cases, however, people are looking for
a slowdown because they are fearful growth will drive up inflation -- these are
particularly older investors who are accustomed to inflation accompanying
growth. But we currently just don't see the pressure toward inflation at all, so
there's no reason to want a slowdown. The best approach now, as in any market,
is to diversify and invest for the long term.
  Thank you for your continued support. We appreciate the opportunity to serve
your investment needs.

Sincerely,

/s/ JOHN E. SILVIA

John E. Silvia

THE INFORMATION CONTAINED IN THIS PIECE HAS BEEN TAKEN FROM SOURCES BELIEVED TO
BE RELIABLE, BUT THE ACCURACY OF THE INFORMATION IS NOT GUARANTEED. THE OPINIONS
AND FORECASTS EXPRESSED ARE THOSE OF DR. JOHN SILVIA AS OF MAY 5, 1999, AND MAY
NOT ACTUALLY COME TO PASS. THIS INFORMATION IS SUBJECT TO CHANGE. NO PART OF
THIS MATERIAL IS INTENDED AS AN INVESTMENT RECOMMENDATION.

TO OBTAIN A KEMPER FUNDS PROSPECTUS, DOWNLOAD ONE FROM WWW.KEMPER.COM, TALK TO
YOUR FINANCIAL REPRESENTATIVE OR CALL SHAREHOLDER SERVICES AT (800) 621-1048.
THE PROSPECTUS CONTAINS MORE COMPLETE INFORMATION, INCLUDING MANAGEMENT FEES AND
EXPENSES. PLEASE READ IT CAREFULLY BEFORE YOU INVEST OR SEND MONEY.



4
<PAGE>   5
PERFORMANCE UPDATE

[VANDENBERG PHOTO]

RICHARD VANDENBERG JOINED SCUDDER KEMPER INVESTMENTS, INC. IN MARCH 1996 AND IS
A MANAGING DIRECTOR. HE IS ALSO A PORTFOLIO MANAGER OF KEMPER U.S. MORTGAGE
FUND. VANDENBERG HAS 25 YEARS OF FIXED-INCOME PORTFOLIO MANAGEMENT EXPERIENCE.
THE VIEWS EXPRESSED IN THIS REPORT REFLECT THOSE OF THE PORTFOLIO MANAGER ONLY
THROUGH THE END OF THE PERIOD OF THE REPORT, AS STATED ON THE COVER. THE
MANAGER'S VIEWS ARE SUBJECT TO CHANGE AT ANY TIME, BASED ON MARKET AND OTHER
CONDITIONS.

DURING THE LAST SIX MONTHS, THE U.S. GOVERNMENT BOND MARKET EXPERIENCED A
TRANSITION AS INVESTORS ALTERED THE "FLIGHT-TO-QUALITY" MENTALITY THAT HAD
PUSHED BOND YIELDS DOWN TO HISTORICALLY LOW LEVELS. IN THIS REPORT, RICHARD
VANDENBERG DISCUSSES HOW THIS CHANGE IMPACTED THE MARKET AND HOW THE FUND WAS
POSITIONED TO RESPOND.

Q     HOW DID THE GOVERNMENT BOND MARKET PERFORM DURING THE FIRST SIX MONTHS OF
THE FISCAL YEAR?

A     The period from October 1998 to March 1999 can probably best be described
as a return to normalcy in the market, albeit a bumpy one. The returns investors
received varied substantially by instrument and by maturity. Mortgages tended to
outperform Treasuries, and the long end of the market was fairly volatile.

  If you recall, 30-year Treasury bond yields in October were at or near
all-time lows. The reason was a "flight-to-quality" as investors worldwide,
anxious about the health of foreign economies, rushed to the safe haven of U.S.
Treasuries. Demand pushed yields dramatically lower on longer-maturity
instruments. Essentially, this was a culmination of an 18-month long
preoccupation with global economies that overshadowed the usual emphasis on
economic conditions at home.

  As the fiscal year began in October, that mentality changed. To show America's
commitment to supporting economies worldwide, the Federal Reserve cut interest
rates twice in October. While this helped support global markets, investors
began to wonder if the cuts might spur strong growth and renewed inflation in
the U.S. long-term government bond yields responded with a sharp jump in
October, rising nearly 50 basis points from October 5 (4.72 percent) to October
23 (5.18 percent). From that point through February, the market was caught in a
tug-of-war as investors tried to determine the extent of weakness in global
economies and strength in the American economy, and how each would affect the
other. This uncertainty culminated in early March, when 30-Year Treasury yields
hit 5.70 percent, almost a 100 basis point move from their October low.

  In March, we finally started to get answers to some of those nagging
questions. Asia began showing signs of recovery, and the Japanese appeared
serious about stimulating their economy. Potential problems in Latin America,
especially Brazil, now look as if they are under control and won't hurt the U.S.
economy as much as some people feared. And in America, the economy is rolling
along with 4.50 percent-5.00 percent GDP growth in the first quarter with no
signs of a substantive increase in inflation. So, after the outsized moves of
the last 18 months, we're returning to a more normal atmosphere, with yields
fluctuating in a narrow range.

Q     HOW DID YOU POSITION THE FUND DURING THIS UNCERTAIN PERIOD?

A     Even though the market was volatile and there was a lot of anxiety among
investors, in October we were reasonably certain of one thing: that rates
wouldn't go much lower. Therefore, for most of the six-month period we kept the
duration of the fund neutral and worked




                                                                               5
<PAGE>   6
PERFORMANCE UPDATE


to add performance by maintaining an overweight in mortgage-backed securities.
In part, we bought mortgages because, in an environment of steady or rising
interest rates, mortgages generally outperform Treasuries due to the yield
advantage they offer. Also, after the substantial rally in Treasuries that took
place last summer, mortgages offered excellent value. This strategy worked well
since mortgages outperformed Treasuries for the majority of the six-month
period.
  We also adjusted the coupons of the mortgages we bought as market conditions
changed. The goal was to keep the fund concentrated in mortgages that offered
the best trade-off of risk and return given the market's psychology. Because the
market has been so volatile, we were somewhat defensive by moving down in
coupons. While this meant giving up a little bit in income, it also meant we
were able to provide a relatively attractive total return in a fast-changing
environment.
  For example, the fund remains in the top 25 percent for the 1-year period of
U.S. Mortgage Funds tracked by Lipper Analytical Services. For the 1-year period
ended March 31, 1999 for Class A shares, the fund ranked #16 of 67 funds. (See
page one for more information.)
  For various reasons, we don't think rates will rise much from here. Therefore,
we continue to maintain a higher than normal allocation to mortgages,
particularly GNMAs. We also lengthened our duration slightly versus our peer
group, which should enhance the fund's total return if we're correct in our
interest rate expectations.

Q     YOU'VE SAID YOU DON'T EXPECT RATES TO GO UP MUCH FROM HERE. WHY?

A     There are several reasons. First, there's been a lot of talk about the
strength of the economy and the big first quarter GDP number, but we feel a
large part of that was the traditional first quarter spending of tax refunds.
The average refund was far more than last year and we think the consumer has put
that to work already. We believe it's unlikely that this pace of growth will
continue into the summer.

  Longer term, the U.S. government's fiscal surplus is starting to be felt. The
supply of new Treasury offerings will be relatively light, which should help
raise prices and lower yields.

  And finally, the market is now starting to stabilize and appears to offer good
value. Inflation has been very tame. An increase in oil prices caused some
concern at the end of March, but the market was able to absorb it. With
investors able to reap about 6 percent on intermediate-maturity AAA-rated
mortgages and inflation lodged near 3 percent, fixed income investors are
getting a nice return on their investment and we would expect the stability to
continue.




6
<PAGE>   7
PORTFOLIO STATISTICS

PORTFOLIO COMPOSITION*

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                    ON 3/31/99              ON 9/30/98
- --------------------------------------------------------------------------------
<S>                                     <C>                     <C>
MORTGAGED-BACKED
 GNMA                                   72%                     81%
- --------------------------------------------------------------------------------
 OTHER                                  17                      10
- --------------------------------------------------------------------------------
LONG-TERM GOVERNMENT SECURITIES          9                       7
- --------------------------------------------------------------------------------
INTERMEDIATE-TERM GOVERNMENT
SECURITIES                               2                       2
- --------------------------------------------------------------------------------
                                       100%                    100%
</TABLE>

                                    [PIE CHART]              [PIE CHART]
                                    ON 3/31/99               ON 9/30/98
YEARS TO MATURITY

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                    ON 3/31/99               ON 9/30/98
- --------------------------------------------------------------------------------
<S>                                   <C>                       <C>
LESS THAN 5                            24%                       59%
- --------------------------------------------------------------------------------
5-10 YEARS                             64                        35
- --------------------------------------------------------------------------------
11-20 YEARS                            12                         1
- --------------------------------------------------------------------------------
21 + YEARS                             --                         5
- --------------------------------------------------------------------------------
                                      100%                      100%
</TABLE>

                                    [PIE CHART]              [PIE CHART]
                                    ON 3/31/99               ON 9/30/98

AVERAGE MATURITY

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                    ON 3/31/99               ON 9/30/98
- --------------------------------------------------------------------------------
<S>                                 <C>                      <C>
AVERAGE MATURITY                    6.8 years                5.2 years
- --------------------------------------------------------------------------------
</TABLE>

*PORTFOLIO COMPOSITION IS SUBJECT TO CHANGE.

                                                                               7
<PAGE>   8
PORTFOLIO OF INVESTMENTS

KEMPER U.S. MORTGAGE FUND

Portfolio of Investments at March 31, 1999 (unaudited)
(Dollars in thousands)
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
                                                                            COUPON                PRINCIPAL
    U.S. GOVERNMENT OBLIGATIONS                   TYPE                       RATE    MATURITY     AMOUNT       VALUE
- -----------------------------------------------------------------------------------------------------------------------
    <S>                                           <C>                       <C>      <C>         <C>         <C>
    GOVERNMENT NATIONAL
    MORTGAGE ASSOCIATION - 71.6%
    (Cost: $1,432,135)
                                                  Pass-through
                                                  certificates               6.00%   2023-2029   $ 61,326    $   59,579
                                                                             6.50    2022-2029    481,664       480,107
                                                                             7.00    2012-2029    496,621       504,133
                                                                             7.50    2011-2029    164,894       170,179
                                                                             8.00    2008-2027    157,072       164,135
                                                                             8.50    2017-2027      9,634        10,183
                                                                             9.00    2008-2028     53,166        56,982
                                                                             9.50    2009-2023     22,717        24,477
                                                                            10.00    2016-2021      2,551         2,809
                                                                            10.50    2019-2021      3,445         3,797
                                                                            11.00    2019             139           152
                                                  ---------------------------------------------------------------------
                                                                                                              1,476,533
- -----------------------------------------------------------------------------------------------------------------------
    FEDERAL HOME LOAN
    MORTGAGE CORPORATION - 11.8%
    (Cost: $245,123)
                                                  Pass-through
                                                  certificates               6.00    2028          34,529        33,580
                                                                             6.50    2029          40,000        39,831
                                                                             7.00    2028-2029     33,901        34,404
                                                                             7.50    2012-2029     89,892        92,450
                                                                             8.00    2017             501           522
                                                                             8.50    2016-2028     26,154        27,470
                                                                             9.50    2020          15,221        16,255
                                                  ---------------------------------------------------------------------
                                                                                                                244,512
- -----------------------------------------------------------------------------------------------------------------------
    U.S. TREASURY
    SECURITIES - 11.0%
    (Cost: $228,853)
                                                  Bonds                     10.75    2003          35,270        42,111
                                                                            10.375   2012          40,500        53,422
                                                                            12.50    2014          33,300        50,959
                                                                            11.25    2015          21,355        33,287
                                                                             7.50    2016          33,500        39,337
                                                                             8.125   2021           5,455         6,934
                                                  ---------------------------------------------------------------------
                                                                                                                226,050
- -----------------------------------------------------------------------------------------------------------------------
    FEDERAL NATIONAL
    MORTGAGE ASSOCIATION - 5.6%
    (Cost: $116,155)
                                                  Pass-through
                                                  certificates               5.50    2028-2029     38,341        36,214
                                                                             6.00    2029          35,996        34,973
                                                                             6.50    2026-2029        426           424
                                                                             8.00    2024           3,821         3,972
                                                                             9.00    2016-2025     38,139        40,332
                                                                            11.50    2018             252           276
                                                  ---------------------------------------------------------------------
                                                                                                                116,191
                                                  ---------------------------------------------------------------------
                                                  TOTAL INVESTMENT PORTFOLIO--100%
                                                  (Cost: $2,022,266)                                         $2,063,286
                                                  ---------------------------------------------------------------------
</TABLE>
- --------------------------------------------------------------------------------
 NOTE TO PORTFOLIO OF INVESTMENTS
- --------------------------------------------------------------------------------
Based on the cost of investments of $2,022,266,000 for federal income tax
purposes at March 31, 1999, the gross unrealized appreciation was $48,970,000,
the gross unrealized depreciation was $7,950,000 and the net unrealized
appreciation on investments was $41,020,000.

See accompanying Notes to Financial Statements.

8
<PAGE>   9

FINANCIAL STATEMENTS

STATEMENT OF ASSETS AND LIABILITIES
March 31, 1999 (unaudited)
(IN THOUSANDS)

<TABLE>
<S>                                                             <C>
- --------------------------------------------------------------------------
ASSETS
- --------------------------------------------------------------------------
Investments, at value
(Cost: $2,022,266)                                              $2,063,286
- --------------------------------------------------------------------------
Cash                                                                   497
- --------------------------------------------------------------------------
Receivable for:
  Investments sold                                                  41,246
- --------------------------------------------------------------------------
  Fund shares sold                                                     165
- --------------------------------------------------------------------------
  Interest                                                          14,789
- --------------------------------------------------------------------------
    TOTAL ASSETS                                                 2,119,983
- --------------------------------------------------------------------------
- --------------------------------------------------------------------------
 LIABILITIES AND NET ASSETS
- --------------------------------------------------------------------------
Payable for:
  Investments purchased                                            110,931
- --------------------------------------------------------------------------
  Fund shares redeemed                                               1,098
- --------------------------------------------------------------------------
  Management fee                                                       728
- --------------------------------------------------------------------------
  Distribution services fee                                            141
- --------------------------------------------------------------------------
  Administrative services fee                                          369
- --------------------------------------------------------------------------
  Custodian and transfer agent fees and related expenses               805
- --------------------------------------------------------------------------
  Trustees' fees and others                                            190
- --------------------------------------------------------------------------
    Total liabilities                                              114,262
- --------------------------------------------------------------------------
NET ASSETS                                                      $2,005,721
- --------------------------------------------------------------------------
- --------------------------------------------------------------------------
 ANALYSIS OF NET ASSETS
- --------------------------------------------------------------------------
Paid-in capital                                                 $2,568,374
- --------------------------------------------------------------------------
Accumulated net realized loss on investments                      (603,609)
- --------------------------------------------------------------------------
Net unrealized appreciation on investments                          40,956
- --------------------------------------------------------------------------
NET ASSETS APPLICABLE TO SHARES OUTSTANDING                     $2,005,721
- --------------------------------------------------------------------------
- --------------------------------------------------------------------------
 THE PRICING OF SHARES
- --------------------------------------------------------------------------
CLASS A SHARES
  Net asset value and redemption price per share ($1,764,674
  / 252,974 shares outstanding)                                      $6.98
- --------------------------------------------------------------------------
  Maximum offering price per share (net asset value, plus
  4.71% of net asset value or 4.50% of offering price)               $7.31
- --------------------------------------------------------------------------
CLASS B SHARES
  Net asset value and redemption price (subject to
  contingent deferred sales charge) per share ($237,114 /
  34,009 shares outstanding)                                         $6.97
- --------------------------------------------------------------------------
CLASS C SHARES
  Net asset value and redemption price (subject to
  contingent deferred sales charge) per share ($3,933 / 564
  shares outstanding)                                                $6.98
- --------------------------------------------------------------------------
</TABLE>

See accompanying Notes to Financial Statements.

                                                                               9
<PAGE>   10
FINANCIAL STATEMENTS

STATEMENT OF OPERATIONS
Six months ended March 31, 1999 (unaudited)
(IN THOUSANDS)

<TABLE>
<S>                                                             <C>
- ------------------------------------------------------------------------
NET INVESTMENT INCOME
- ------------------------------------------------------------------------
Interest income                                                 $ 71,864
- ------------------------------------------------------------------------
Expenses:
  Management fee                                                   5,218
- ------------------------------------------------------------------------
  Distribution services fee                                        1,105
- ------------------------------------------------------------------------
  Administrative services fee                                      2,459
- ------------------------------------------------------------------------
  Custodian and transfer agent fees and related expenses           2,357
- ------------------------------------------------------------------------
  Professional fees                                                   43
- ------------------------------------------------------------------------
  Reports to shareholders                                            217
- ------------------------------------------------------------------------
  Trustees' fees and other                                            56
- ------------------------------------------------------------------------
    Total expenses                                                11,455
- ------------------------------------------------------------------------
NET INVESTMENT INCOME                                             60,409
- ------------------------------------------------------------------------
- ------------------------------------------------------------------------
 NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS
- ------------------------------------------------------------------------
  Net realized gain on sales of investments                        5,848
- ------------------------------------------------------------------------
  Net realized gain from futures transactions                      5,353
- ------------------------------------------------------------------------
    Net realized gain                                             11,201
- ------------------------------------------------------------------------
  Change in net unrealized appreciation on investments           (57,178)
- ------------------------------------------------------------------------
Net loss on investments                                          (45,977)
- ------------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS            $ 14,432
- ------------------------------------------------------------------------
</TABLE>

STATEMENT OF CHANGES IN NET ASSETS

For the six months ended March 31, 1999 (unaudited) and for the year
ended September 30, 1998

(IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                   1999                 1998
<S>                                                             <C>                   <C>
- -----------------------------------------------------------------------------------------------
OPERATIONS, DIVIDENDS AND CAPITAL SHARE ACTIVITY
- -----------------------------------------------------------------------------------------------
  Net investment income                                         $   60,409              144,491
- -----------------------------------------------------------------------------------------------
  Net realized gain                                                 11,201               53,220
- -----------------------------------------------------------------------------------------------
  Change in net unrealized appreciation                            (57,178)              (5,231)
- -----------------------------------------------------------------------------------------------
Net increase in net assets resulting from operations                14,432              192,480
- -----------------------------------------------------------------------------------------------
Distribution from net investment income                            (65,075)            (148,396)
- -----------------------------------------------------------------------------------------------
Net decrease from capital share transactions                      (127,811)            (357,734)
- -----------------------------------------------------------------------------------------------
TOTAL DECREASE IN NET ASSETS                                      (178,454)            (313,650)
- -----------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------
 NET ASSETS
- -----------------------------------------------------------------------------------------------
Beginning of period                                              2,184,175            2,497,825
- -----------------------------------------------------------------------------------------------
END OF PERIOD                                                   $2,005,721            2,184,175
- -----------------------------------------------------------------------------------------------
</TABLE>

10
<PAGE>   11

NOTES TO FINANCIAL STATEMENTS

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

1    DESCRIPTION OF THE
     FUND                    Kemper U.S. Mortgage Fund (the fund) is a separate
                             series of Kemper Portfolios, 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 March 31, 1999)
                             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. Investments are stated at
                             value. 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
                             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. 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.

                             The fund may purchase securities with delivery or
                             payment to occur at a later date beyond the normal
                             settlement period. At the time the fund enters into
                             a commitment to purchase a security, the
                             transaction is recorded and the value of the
                             security is reflected in the net asset value. The
                             value of the security may vary with market
                             fluctuations. No interest accrues to the fund until
                             payment takes place. At the time the fund enters
                             into this type of transaction it is required to

                                                                              11
<PAGE>   12
NOTES TO FINANCIAL STATEMENTS

                             segregate cash or other liquid assets equal to the
                             value of the securities purchased.

                             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.

                             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 September 30, 1998, the fund had a tax basis net
                             loss carryforward of approximately $612,745,000,
                             which may be applied against any realized net
                             taxable gains of each succeeding year until fully
                             utilized or it will expire during the period 2000
                             through 2005.

                             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
                             from generally accepted accounting principles.

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

3    TRANSACTIONS WITH
     AFFILIATES              MANAGEMENT AGREEMENT. The fund has a management
                             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 $5,218,000 for the six
                             months ended March 31, 1999.

                             UNDERWRITING AND DISTRIBUTION SERVICES AGREEMENT.
                             The fund has an underwriting and distribution
                             services agreement with Kemper Distributors, Inc.
                             (KDI). Underwriting commissions retained by KDI in
                             connection with the distribution of Class A shares
                             for the six months ended March 31, 1999 are
                             $17,000.

                             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 Rule 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 and CDSC received by KDI
                             for the six months ended March 31, 1999 are
                             $1,295,000.

                             ADMINISTRATIVE SERVICES AGREEMENT. The fund has an
                             administrative services agreement with KDI. For
                             providing information and administrative services
                             to 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

12
<PAGE>   13

NOTES TO FINANCIAL STATEMENTS

                             'financial services firms that provide these
                             services and pays these firms based on assets of
                             fund accounts the firms service. Administrative
                             services fees paid by the fund to KDI for the six
                             months ended March 31, 1999 are $2,459,000, of
                             which $15,000 was paid by KDI to affiliates.

                             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
                             $1,561,000 for the six months ended March 31, 1999.

                             OFFICERS AND TRUSTEES. Certain officers or trustees
                             of the fund are also officers or directors of
                             Scudder Kemper. For the six months ended March 31,
                             1999, the fund made no direct payments to its
                             officers and incurred trustees' fees of $20,000 to
                             independent trustees.

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

4    INVESTMENT
     TRANSACTIONS            For the six months ended March 31, 1999, investment
                             transactions (excluding short-term instruments are
                             as follows (in thousands):

                             Purchases                                $1,603,109

                             Proceeds from sales                       1,749,568

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

5    CAPITAL SHARE
     TRANSACTIONS            The following table summarizes the activity in
                             capital shares of the fund (in thousands):

<TABLE>
<CAPTION>
                                                            SIX MONTHS ENDED                 YEAR ENDED
                                                             MARCH 31, 1999              SEPTEMBER 30, 1998
                                                         -----------------------       -----------------------
                                                         SHARES         AMOUNT         SHARES         AMOUNT
                             ---------------------------------------------------------------------------------
                             <S>                         <C>           <C>             <C>           <C>
                             SHARES SOLD
                             ---------------------------------------------------------------------------------
                              Class A                      2,245       $  15,903         4,079       $  25,320
                             ---------------------------------------------------------------------------------
                              Class B                      1,607          11,320         4,837          33,684
                             ---------------------------------------------------------------------------------
                              Class C                         82             581           222           1,553
                             ---------------------------------------------------------------------------------
                             ---------------------------------------------------------------------------------
                              SHARES ISSUED IN REINVESTMENT OF DIVIDENDS
                             ---------------------------------------------------------------------------------
                              Class A                      4,844          34,063         9,729          68,880
                             ---------------------------------------------------------------------------------
                              Class B                        792           5,564         2,592          18,428
                             ---------------------------------------------------------------------------------
                              Class C                         10              69            12             106
                             ---------------------------------------------------------------------------------
                             ---------------------------------------------------------------------------------
                              SHARES REDEEMED
                             ---------------------------------------------------------------------------------
                              Class A                    (21,305)       (150,261)      (53,052)       (374,209)
                             ---------------------------------------------------------------------------------
                              Class B                     (6,330)        (44,603)      (19,074)       (130,852)
                             ---------------------------------------------------------------------------------
                              Class C                        (63)           (447)          (91)           (644)
                             ---------------------------------------------------------------------------------
                             ---------------------------------------------------------------------------------
                              CONVERSION OF SHARES
                             ---------------------------------------------------------------------------------
                              Class A                     13,628          96,033        39,860         281,271
                             ---------------------------------------------------------------------------------
                              Class B                    (13,638)        (96,033)      (39,907)       (281,271)
                             ---------------------------------------------------------------------------------
                              NET DECREASE FROM
                              CAPITAL SHARE TRANSACTIONS               $(127,811)                    $(357,734)
                             ---------------------------------------------------------------------------------
</TABLE>

                                                                              13
<PAGE>   14
NOTES TO FINANCIAL STATEMENTS

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

6    FINANCIAL FUTURES
     CONTRACTS               The fund has entered into exchange traded financial
                             futures contracts in order to take advantage of
                             anticipated market conditions and, as such, bears
                             the risk that arises from owning these contracts.

                             At the time the fund enters into a futures
                             contract, it is required to make a margin deposit
                             with its custodian. Subsequently, payments are made
                             on a daily basis between the fund and the broker as
                             the market value of the futures contract fluctuates
                             and are recorded for financial reporting purposes
                             as unrealized gains or losses by the fund. At March
                             31, 1999, the market value of assets pledged by the
                             fund to cover margin requirements for open futures
                             positions was $3,866,000. The fund also had liquid
                             securities in its portfolio in excess of the face
                             amount of the following short futures positions
                             open at March 31, 1999 (in thousands):

<TABLE>
<CAPTION>
                                                                                                  UNREALIZED
                                                                FACE           EXPIRATION         GAIN/(LOSS)
                                          TYPE                 AMOUNT            MONTH            AT 3/31/99
                             --------------------------------------------------------------------------------
                             <S>                               <C>             <C>                <C>
                              U.S. Treasury Notes              $68,297          June '99             $  38
                             --------------------------------------------------------------------------------
                              U.S. Treasury Bonds               65,465          June '99              (102)
                             --------------------------------------------------------------------------------
                                 TOTAL                                                               $ (64)
                             --------------------------------------------------------------------------------
</TABLE>





14
<PAGE>   15

FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                           -------------------------------------------------------------
                                                                      CLASS A
                                           -------------------------------------------------------------
                                           SIX MONTHS        YEAR ENDED        TWO MONTHS
                                              ENDED        SEPTEMBER 30,          ENDED       YEAR ENDED
                                            MARCH 31,    ------------------   SEPTEMBER 30,    JULY 31,
                                              1999       1998   1997   1996       1995           1995
- --------------------------------------------------------------------------------------------------------
<S>                                           <C>        <C>    <C>    <C>        <C>            <C>
PER SHARE OPERATING PERFORMANCE
- --------------------------------------------------------------------------------------------------------
Net asset value, beginning of period          $7.15      7.01   6.91   7.13       7.06           6.96
- --------------------------------------------------------------------------------------------------------
Income from investment operations:
  Net investment income                         .21       .44    .52    .49        .08            .53
- --------------------------------------------------------------------------------------------------------
  Net realized and unrealized gain (loss)      (.15)      .17    .10   (.19)       .08            .09
- --------------------------------------------------------------------------------------------------------
Total from investment operations                .06       .61    .62    .30        .16            .62
- --------------------------------------------------------------------------------------------------------
Less distribution from net investment
  income                                        .23       .47    .52    .52        .09            .52
- --------------------------------------------------------------------------------------------------------
Net asset value, end of period                $6.98      7.15   7.01   6.91       7.13           7.06
- --------------------------------------------------------------------------------------------------------
TOTAL RETURN (NOT ANNUALIZED)                   .79%     8.99   9.26   4.28       2.23           9.48
- --------------------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS (ANNUALIZED)
- --------------------------------------------------------------------------------------------------------
Expenses                                        .97%      .97    .96    .97        .94            .89
- --------------------------------------------------------------------------------------------------------
Net investment income                          5.00%     6.46   7.23   6.98       6.87           7.77
- --------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                           -------------------------------------------------------------
                                                                      CLASS B
                                           -------------------------------------------------------------
                                           SIX MONTHS        YEAR ENDED        TWO MONTHS
                                              ENDED        SEPTEMBER 30,          ENDED       YEAR ENDED
                                            MARCH 31,    ------------------   SEPTEMBER 30,    JULY 31,
                                              1999       1998   1997   1996       1995           1995
- --------------------------------------------------------------------------------------------------------
<S>                                           <C>        <C>    <C>    <C>        <C>            <C>
PER SHARE OPERATING PERFORMANCE
- --------------------------------------------------------------------------------------------------------
Net asset value, beginning of period          $7.14      7.00   6.91   7.12       7.05           6.96
- --------------------------------------------------------------------------------------------------------
Income from investment operations Net
  investment income                             .18       .40    .45    .44        .07            .47
- --------------------------------------------------------------------------------------------------------
  Net realized and unrealized gain (loss)      (.16)      .14    .10   (.19)       .08            .09
- --------------------------------------------------------------------------------------------------------
Total from investment operations                .02       .54    .55    .25        .15            .56
- --------------------------------------------------------------------------------------------------------
Less distribution from net investment
  income                                        .19       .40    .46    .46        .08            .47
- --------------------------------------------------------------------------------------------------------
Net asset value, end of period                $6.97      7.14   7.00   6.91       7.12           7.05
- --------------------------------------------------------------------------------------------------------
TOTAL RETURN (NOT ANNUALIZED)                   .31%     8.00   8.17   3.54       2.09           8.44
- --------------------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS (ANNUALIZED)
- --------------------------------------------------------------------------------------------------------
Expenses                                       1.87%     1.19   1.83   1.80       1.79           1.75
- --------------------------------------------------------------------------------------------------------
Net investment income                          4.10%     5.52   6.36   6.15       6.02           6.91
- --------------------------------------------------------------------------------------------------------
</TABLE>

                                                                              15
<PAGE>   16

FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                           -------------------------------------------------------------------------
                                                                      CLASS C
                                           -------------------------------------------------------------------------
                                           SIX MONTHS        YEAR ENDED        TWO MONTHS
                                              ENDED        SEPTEMBER 30,          ENDED       YEAR ENDED
                                            MARCH 31,    ------------------   SEPTEMBER 30,    JULY 31,
                                              1999       1998   1997   1996       1995           1995
- --------------------------------------------------------------------------------------------------------------------
<S>                                           <C>        <C>    <C>    <C>        <C>            <C>
PER SHARE OPERATING PERFORMANCE
- --------------------------------------------------------------------------------------------------------------------
Net asset value, beginning of period          $7.15      7.00   6.90   7.12       7.05           6.95
- --------------------------------------------------------------------------------------------------------------------
Income from investment operations: Net
  investment income                             .18       .40    .46    .43        .07            .48
- --------------------------------------------------------------------------------------------------------------------
  Net realized and unrealized gain (loss)      (.15)      .16    .10   (.19)       .08            .09
- --------------------------------------------------------------------------------------------------------------------
Total from investment operations                .03       .56    .56    .24        .15            .57
- --------------------------------------------------------------------------------------------------------------------
Less distribution from net investment
  income                                        .20       .41    .46    .46        .08            .47
- --------------------------------------------------------------------------------------------------------------------
Net asset value, end of period                $6.98      7.15   7.00   6.90       7.12           7.05
- --------------------------------------------------------------------------------------------------------------------
TOTAL RETURN (NOT ANNUALIZED)                   .41%     8.30   8.45   3.47       2.10           8.65
- --------------------------------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS (ANNUALIZED)
- --------------------------------------------------------------------------------------------------------------------
Expenses                                       1.67%     1.73   1.71   1.72       1.69           1.71
- --------------------------------------------------------------------------------------------------------------------
Net investment income                          4.30%     5.70   6.48   6.23       6.12           6.95
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
- --------------------------------------------------------------------------------------------------------------------
 SUPPLEMENTAL DATA FOR ALL CLASSES
- --------------------------------------------------------------------------------------------------------------------
                                         SIX MONTHS                                        TWO MONTHS
                                           ENDED          YEAR ENDED SEPTEMBER 30,            ENDED       YEAR ENDED
                                         MARCH 31,    ---------------------------------   SEPTEMBER 30,    JULY 31,
                                            1999        1998        1997        1996          1995           1995
- --------------------------------------------------------------------------------------------------------------------
<S>                                      <C>          <C>         <C>         <C>         <C>             <C>
Net assets at end of period (in
thousands)                               $2,005,721   2,184,175   2,497,825   2,960,135     3,493,052     3,528,329
- --------------------------------------------------------------------------------------------------------------------
Portfolio of turnover rate (annualized)        146%         172         235         391           249           573
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

NOTE: Total return does not reflect the effect of any sales charges. Per share
data was determined based on average shares outstanding during the year ended
September 30, 1998. Data for the period ended March 31, 1999 is unaudited.

 16
<PAGE>   17
SHAREHOLDERS' MEETING

SPECIAL SHAREHOLDERS' MEETING

On December 17, 1998, a special shareholders' meeting was held. Kemper U.S.
Mortgage Fund shareholders were asked to vote on two separate issues: approval
of the new Investment Management Agreement between the fund and Scudder Kemper
Investments, Inc., and to modify or eliminate certain policies and to eliminate
the shareholder approval requirement as to certain other matters. The following
are the results.

1) Approval of the new Investment Management Agreement between the fund and
   Scudder Kemper Investments, Inc. This item was approved.

<TABLE>
<CAPTION>
          For       Against     Abstain
      <S>          <C>         <C>
      174,957,304  3,553,218   8,886,971
</TABLE>

2) To modify or eliminate certain policies and to eliminate the shareholder
   approval requirements as to certain other matters. These items were approved.

Investment objectives

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,671,102  8,423,624   14,177,965   37,124,802
</TABLE>

Investment policies

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,649,534  8,437,530   14,185,627   37,124,802
</TABLE>

Diversification

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,802,752  8,284,312   14,185,627   37,124,802
</TABLE>

Borrowing

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,593,996  8,498,343   14,180,352   37,124,802
</TABLE>

Senior securities

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,800,323  8,292,016   14,180,352   37,124,802
</TABLE>

Concentration

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,806,227  8,280,837   14,185,627   37,124,802
</TABLE>

Underwriting of securities

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,823,803  8,263,261   14,185,627   37,124,802
</TABLE>

Investment in real estate

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,670,771  8,421,568   14,180,352   37,124,802
</TABLE>

Purchase of commodities

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,535,040  8,552,024   14,185,627   37,124,802
</TABLE>

Lending

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,641,841  8,445,223   14,185,627   37,124,802
</TABLE>

Margin purchases and short sales

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,337,269  8,749,795   14,185,627   37,124,802
</TABLE>

Purchases of securities of related issuers

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,686,248  8,400,816   14,185,627   37,124,802
</TABLE>

Restricted and illiquid securities

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,481,948  8,605,116   14,185,627   37,124,802
</TABLE>

Purchases of securities

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,716,024  8,371,040   14,185,627   37,124,802
</TABLE>

Purchases of options and warrants

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,544,875  8,542,189   14,185,627   37,124,802
</TABLE>

Investment for the purpose of exercising control or management

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,608,020  8,484,318   14,180,352   37,124,802
</TABLE>



                                                                              17
<PAGE>   18
SHAREHOLDERS' MEETING

Investment in mineral exploration

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,256,612  8,835,727   14,180,352   37,124,802
</TABLE>

Investment in issuers with short histories

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,150,639  8,936,425   14,185,627   37,124,802
</TABLE>

Investment in other investment companies

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  127,541,740  8,545,324   14,185,627   37,124,802
</TABLE>

Investment other than in accordance with objectives and policies

<TABLE>
<CAPTION>
                                          Broker
      For       Against     Abstain     Non-Votes
  <S>          <C>         <C>          <C>
  126,959,067  9,127,997   14,185,627   37,124,802
</TABLE>



18
<PAGE>   19

NOTES

                                                                              19
<PAGE>   20
TRUSTEES AND OFFICERS

<TABLE>
<CAPTION>

<S>                               <C>                               <C>
TRUSTEES                          OFFICERS
DANIEL PIERCE                     MARK S. CASADY                    RICHARD L. VANDENBERG
Chairman and Trustee              President                         Vice President
LEWIS A. BURNHAM                  PHILIP J. COLLORA                 MAUREEN E. KANE
Trustee                           Vice President                    Assistant Secretary
                                  and Secretary
DONALD L. DUNAWAY                                                   CAROLINE PEARSON
Trustee                           JOHN R. HEBBLE                    Assistant Secretary
                                  Treasurer
ROBERT B. HOFFMAN                                                   ELIZABETH C. WERTH
Trustee                           ANN M. MCCREARY                   Assistant Secretary
                                  Vice President
DONALD R. JONES                                                     BRENDA LYONS
Trustee                           ROBERT C. PECK, JR.               Assistant Treasurer
                                  Vice President
THOMAS W. LITTAUER
Trustee and Vice President        KATHRYN L. QUIRK
                                  Vice President
SHIRLEY D. PETERSEN
Trustee                           FRANK J. RACHWALSKI, JR.
                                  Vice President
WILLIAM P. SOMMERS
Trustee                           LINDA J. WONDRACK
                                  Vice President
</TABLE>

<TABLE>
<S>                                   <C>
- ----------------------------------------------------------------------------------------------
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                         STATE STREET BANK AND TRUST COMPANY
TRANSFER AGENT                        225 Franklin Street
                                      Boston, MA 02109
                                      INVESTORS FIDUCIARY TRUST COMPANY
                                      801 Pennsylvania Avenue
                                      Kansas City, MO 64105
- ----------------------------------------------------------------------------------------------
PRINCIPAL                             KEMPER DISTRIBUTORS, INC.
UNDERWRITERS                          222 South Riverside Plaza  Chicago, IL 60606
                                      www.kemper.com
</TABLE>


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Long-term investing in a short-term world(SM)

Printed in the U.S.A. on recycled paper.

This report is not to be distributed unless preceded
or accompanied by a Kemper Fixed Income
Fund prospectus.

KUSMF - 3 (5/21/99) 1074040


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