AMERICAN CENTURY MUNICIPAL TRUST
N-30D, 1999-01-29
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[front cover]                                                 NOVEMBER 30, 1998

SEMIANNUAL REPORT
- ----------------
AMERICAN CENTURY

                               [graphic of stairs]

BENHAM GROUP
- ------------------------------------
ARIZONA INTERMEDIATE-TERM MUNICIPAL

                                                 [american century logo(reg.sm)]
                                                                        American
                                                                         Century
[inside front cover]


AMERICAN CENTURY BROKERAGE
- --------------------------------------------------------------------------------

     We're pleased to introduce American Century's new brokerage service,  which
offers a wide range of investment options and features:

     *  FundChoice  Service--Invest  in over 8,000 no-load and load mutual funds
        from hundreds of different fund companies, many with no transaction fees

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     *  24-hour  Internet and  automated  phone trades are just $24.95 for up to
        1,000 shares of stock, and 2 cents per share thereafter

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         *  Get news, quotes and charts

         *  Check free Standard & Poor's stock reports

         *  Access Wall Street on Demand(tm),  a research service with more than
            500,000 reports on industry trends,  corporate earnings,  and mutual
            fund analysis

     *  Track your brokerage account on one easy-to-read statement

     *  Unlimited  check writing and a Gold  MasterCard(reg.tm)  ATM/debit  card
        with an American Century Brokerage Access AccountSM (minimum $10,000)

To talk with a Brokerage Associate, call 1-888-345-2071.

WHAT'S NEW . . .

    AMERICAN  CENTURY CATALOG OF TOOLS & SERVICES lists all the free educational
materials available to investors.

    We now have FOUR-PAGE  PROFILES of many of our funds.  The profiles follow a
standard SEC format and are intended to allow investors to compare funds easily.
You can request a profile or the full prospectus. Full prospectuses contain more
detailed fund information and you will continue to receive one after investing.

    In 1999, we will provide  SIMPLIFIED  PROSPECTUSES that highlight  important
information  about our funds,  including  fees and expenses.  More detailed data
will be in the Statement of Additional Information.

    To order any of these materials, please call 1-800-345-2021.

[left margin]

BENHAM GROUP
ARIZONA INTERMEDIATE-TERM MUNICIPAL
(BEAMX)
- ----------------------------------


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     The six months  ended  November  30, 1998,  were  eventful  ones for global
financial markets.  Weakening economic and financial  conditions,  brought on by
problems in Asia,  Russia,  and Latin America,  led to significant  stock market
volatility and a dramatic  decline in interest rates.  Volatility was so rampant
that the U.S. central bank, the Federal Reserve,  cut short-term  interest rates
three times to help stabilize markets worldwide.

     The  third  quarter  of  1998  served  as a good  example  of the  markets'
extremes.  Several major U.S. stock indices hit record highs in mid-July  before
plunging 20% in the following six weeks. In the bond market, high demand for the
safety of Treasury  bonds pushed  yields down to their lowest  levels ever,  but
demand for  corporate  bonds  thinned  to the point  where  trading  was all but
impossible.

     This  type  of  investment  environment  illustrates  the  importance  of a
well-diversified  investment portfolio.  As we saw in the third quarter of 1998,
allocating your assets among stocks, bonds, and money market funds can help your
portfolio weather dramatic changes in the economic or investment climate.

     Municipal bond  performance fit between the extremes  provided by Treasurys
and corporates.  Munis posted positive returns as interest rates fell, but their
performance  was not as strong as that of Treasurys.  Arizona  Intermediate-Term
Municipal  continued  to  outperform  its peer  group  and its  benchmark  while
providing more federal tax-free income than the average  municipal debt fund. We
achieved these returns while maintaining our high credit  standards.  Our credit
research  team  closely  monitored  the health of the  Arizona  economy  and the
issuers of Arizona  municipal  debt,  helping  fund  managers  maintain  Arizona
Intermediate-Term Municipal's credit strength and integrity.

     Another situation we've been watching closely is preparation of the world's
computer  systems  for the  year  2000.  At  American  Century,  we're  devoting
substantial  resources to this endeavor.  Throughout  1999, our technology  team
will be  extensively  testing our systems,  including  those  involved with fund
performance and dividend payments.

     Thank you for your continued investment with American Century.

Sincerely,

/s/James E. Stowers, Jr.                 /s/James E. Stowers III
James E. Stowers, Jr.                    James E. Stowers III
Chairman of the Board and Founder        Chief Executive Officer


[right margin]

                Table of Contents
   Report Highlights ..............    2
   Market Perspective .............    3
Arizona Intermediate-Term Municipal
   Performance Information ........    4
   Management Q&A .................    5
   Yields .........................    5
   Portfolio at a Glance ..........    5
   Top Five Sectors ...............    6
   Portfolio Composition
   by Credit Rating ...............    7
   Schedule of Investments ........    8
Financial Statements
   Statement of Assets and
   Liabilities ....................   10
   Statement of Operations ........   11
   Statements of Changes
   in Net Assets ..................   12
   Notes to Financial
   Statements .....................   13
   Financial Highlights ...........   15
Other Information
   Background Information
      Investment Philosophy
      and Policies ................   16
      Comparative Indices .........   16
      Lipper Rankings .............   16
      Credit Rating
      Guidelines ..................   16
      Investment Team
   Leaders ........................   16
   Glossary .......................   17


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   A sharp decline in interest rates helped  municipal bonds post solid returns
    for the six months ended November 30, 1998.

*   Rates fell because a series of economic crises around the globe threatened
    to slow the U.S. economy, and because inflation remained low.

*   In an  attempt  to boost  the  economy  and  restore  confidence  to  global
    financial  markets,  the Federal Reserve lowered  short-term  interest rates
    three times between September and November.

*   Despite their gains,  municipal  bonds lagged  Treasury  securities.  That's
    because  the bond  market  rally was  driven by  demand  from  international
    investors, who don't benefit from municipals' tax advantages.

*   Meanwhile,  municipal  bond supply surged as many issuers  sought to lock in
    lower borrowing costs by refinancing older, higher rate bonds.

MANAGEMENT Q&A

*   Arizona Intermediate-Term Municipal outperformed its benchmark and its peers
    for the six-month period,  while providing investors with significantly more
    federal tax-free income. (See Total Returns on page 4.)

*   Arizona Intermediate-Term Municipal's one-year return placed the fund in the
    top 10% of the 77 "Other States  Intermediate  Municipal Debt Funds" tracked
    by Lipper Inc.

*   Under the guidance of our experienced  research team, we enhanced returns by
    adding undervalued securities to the portfolio.

*   Effective duration  management--controlling  the fund's price sensitivity to
    changes in interest  rates--was  another  important  contributor  to Arizona
    Intermediate-Term Municipal's solid performance. We kept duration around 5.6
    years.

*   As we  anticipated,  the Students FIRST Act of 1998 has had little impact on
    the market so far; however,  the longer-term effects are much more difficult
    to predict.

*   Despite this uncertainty, we think the next six months will be fairly upbeat
    for Arizona municipal investors.

*   Part of this  optimism  is driven by how  attractive  municipal  yields were
    relative to comparable-maturity Treasury yields.

*   Going  forward,  we plan to maintain a slightly long duration  compared with
    the average  intermediate  municipal fund,  while  continuing to monitor the
    impact of Students FIRST.


[left margin]

"ARIZONA INTERMEDIATE-TERM MUNICIPAL'S ONE-YEAR RETURN PLACED THE FUND IN THE
TOP 10% OF THE 77 'OTHER STATES INTERMEDIATE MUNICIPAL DEBT FUNDS' TRACKED BY
LIPPER INC."

                  ARIZONA
        INTERMEDIATE-TERM MUNICIPAL
                   (BEAMX)
TOTAL RETURNS:             AS OF 11/30/98
    6 Months                       3.70%*
    1 Year                          6.83%
NET ASSETS:                 $44.0 million
30-DAY SEC YIELD:                   3.68%
INCEPTION DATE:                   4/11/94

* Not annualized.

See Total Returns on page 4.
Investment terms are defined in the Glossary on page 17.


2      1-800-345-2021


Market Perspective from Randall W. Merk
- --------------------------------------------------------------------------------
/photo of Randall W. Merk/
Randall W. Merk, director of fixed-income investing at American Century

MODERATE MUNICIPAL RETURNS

     Municipal  securities posted gains during the six months ended November 30,
1998.  Municipal bond prices rose as interest rates declined;  however, too much
supply and too little demand limited returns.  Long-term  municipal bonds, which
are most  sensitive to changes in interest  rates,  performed  best. For the six
months,  the Lehman  Brothers  Long-Term  Municipal Bond Index  returned  4.10%.
Intermediate-term  securities,  as  represented  by the Lehman  Brothers  5-Year
General Obligation Index,  returned 3.43%, while the short-term Merrill Lynch 0-
to 3-Year Municipal Index posted a 2.77% return.

RATES FELL

     Declines  in  interest  rates were  sparked by a series of global  economic
crises that threatened to slow the U.S.  economy.  In addition,  an abundance of
inexpensive imported products and falling commodity prices helped keep inflation
low.  The  government's  consumer  price  index rose just 1.5% for the 12 months
ended November 30, 1998. That's the slowest pace in a dozen years.

     In an attempt to boost the  economy  and restore  confidence  in  financial
markets,  the U.S.  Federal  Reserve cut  short-term  interest rates three times
between September and November, its first rate reductions since January 1996.

MUNICIPALS LAGGED TREASURYS

     Plummeting stock markets,  currency devaluations,  and debt defaults caused
investors  around the world to demand the safety and  liquidity  of U.S Treasury
bonds.  That  surge in demand  led to record  low bond  yields and huge gains by
Treasury securities.  Because international investors don't benefit from the tax
advantages of municipal bonds, demand for municipals lagged.

     Furthermore,  the  supply of  municipals  surged.  Motivated  by  declining
interest  rates,  municipal  issuers sought to lock in lower  borrowing costs by
issuing  new debt  and/or  refinancing  older  debt.  For the six  months  ended
November 30, 1998,  new issue volume was up about a third compared with the same
six-month  period  a year  earlier.  These  supply  and  demand  factors  caused
municipal bonds to underperform Treasury securities for the six months.

STEEPER YIELD CURVE

     Reflecting the Fed's interest rate cuts,  short-term interest rates dropped
dramatically.  For the six months,  the yield on one-year  municipal  securities
fell roughly 62 basis points  (0.62%--a  basis point  equals  0.01%),  while the
yield on 30-year municipal bonds fell only about 15 basis points.  This resulted
in the steeper yield curve shown in the accompanying graph. The yield difference
between a one-year  note and a 30-year bond rose to 176 basis points on November
30, 1998, compared with 128 basis points just six months earlier.

[right margin]

"DECLINES IN INTEREST RATES WERE SPARKED BY A SERIES OF GLOBAL ECONOMIC CRISES
THAT THREATENED TO SLOW THE U.S. ECONOMY."

[line chart - data below]

STEEPENING MUNICIPAL YIELD CURVE

Years to Maturity        11/30/98           5/31/98
1                         3.060%             3.690%
2                         3.360%             3.850%
3                         3.510%             3.950%
4                         3.630%             4.040%
5                         3.730%             4.090%
6                         3.825%             4.160%
7                         3.920%             4.230%
8                         4.000%             4.300%
9                         4.080%             4.370%
10                        4.160%             4.440%
11                        4.248%             4.514%
12                        4.336%             4.588%
13                        4.424%             4.662%
14                        4.512%             4.736%
15                        4.600%             4.810%
16                        4.636%             4.836%
17                        4.672%             4.862%
18                        4.708%             4.888%
19                        4.744%             4.914%
20                        4.780%             4.940%
21                        4.784%             4.942%
22                        4.788%             4.944%
23                        4.792%             4.946%
24                        4.796%             4.948%
25                        4.800%             4.950%
26                        4.804%             4.954%
27                        4.808%             4.958%
28                        4.812%             4.962%
29                        4.816%             4.966%
30                        4.820%             4.970%

Source: Bloomberg Financial Markets

"FOR THE SIX MONTHS, THE YIELD ON ONE-YEAR MUNICIPAL  SECURITIES FELL ROUGHLY 62
BASIS POINTS  (0.62%--A  BASIS POINT EQUALS  0.01%),  WHILE THE YIELD ON 30-YEAR
MUNICIPAL BONDS FELL ONLY ABOUT 15 BASIS POINTS."


                                                  www.americancentury.com      3


Arizona Intermediate-Term--Performance
- --------------------------------------------------------------------------------
TOTAL RETURNS AS OF NOVEMBER 30, 1998

<TABLE>
<CAPTION>
                                INCEPTION 4/11/94
                        ARIZONA
                      INTERM.-TERM   LEHMAN 5-YEAR   OTHER STATES INTERM. MUNI. DEBT FUNDS(2)
                        MUNICIPAL      GO INDEX      AVERAGE RETURN        FUND'S RANKING
- ------------------------------------------------------------------------------------------
<S>                        <C>               <C>           <C>              <C>                        
6 MONTHS(1) ............  3.70%         3.43%            3.07%                    --
1 YEAR .................  6.83%         6.32%            6.11%               7 OUT OF 77
- ------------------------------------------------------------------------------------------
AVERAGE ANNUAL RETURNS
3 YEARS(3) .............  5.58%         5.68%            5.19%              11 OUT OF 60
LIFE OF FUND(3) ........  6.67%         6.26%(4)         5.94%(4)            1 OUT OF 45(4)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Returns and rankings  would have been lower if management  fees had not been
    waived.

(4) Since 4/30/94,  the date nearest the fund's  inception for which return data
    are available.

See pages 16-17 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain chart - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 11/30/98
Arizona Intermediate-Term Municipal      $13,351
Lehman 5-Year GO Index                   $12,808

                    Arizona
               Intermediate-Term      Lehman 5-Year
                   Municipal            GO Index
DATE                 VALUE               VALUE
4/30/94*            $10,000             $10,000
6/30/94             $10,064              $9,996
9/30/94             $10,202             $10,077
12/31/94            $10,098             $10,044
3/31/95             $10,562             $10,450
6/30/95             $10,855             $10,717
9/30/95             $11,131             $11,010
12/31/95            $11,431             $11,211
3/31/96             $11,371             $11,246
6/30/96             $11,433             $11,295
9/30/96             $11,619             $11,479
12/31/96            $11,859             $11,730
3/31/97             $11,816             $11,711
6/30/97             $12,130             $12,002
9/30/97             $12,414             $12,264
12/31/97            $12,676             $12,490
3/31/98             $12,764             $12,636
6/30/98             $12,914             $12,764
9/30/98             $13,170             $12,983
11/30/98            $13,351             $12,808

$10,000 investment made 4/30/94

The chart at left shows the growth of a $10,000  investment over the life of the
fund,  while the chart  below  shows the fund's  year-by-year  performance.  The
Lehman  5-Year  GO Index is  provided  for  comparison  in each  chart.  Arizona
Intermediate-Term  Municipal's  returns  include  operating  expenses  (such  as
transaction costs and management fees) that reduce returns, while the returns of
the index do not. Past performance does not guarantee future results. Investment
return and principal value will fluctuate,  and redemption  value may be more or
less than original cost.

[bar chart - data below]

ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDED NOVEMBER 30)

                    Arizona
               Intermediate-Term     Lehman 5-Year
                    Municipal          GO Index
DATE                 RETURN             RETURN
11/30/94*            -0.27%             -0.07%
11/30/95             13.73%             11.99%
11/30/96              4.91%              5.36%
11/30/97              5.02%              5.38%
11/30/98              6.83%              6.32%

* From 4/30/94 (the date nearest the fund's  inception  for which index data are
  available).


4      1-800-345-2021


Arizona Intermediate-Term--Q&A
- --------------------------------------------------------------------------------
/photo of Ken Salinger/

     An  interview  with  Ken  Salinger,  a  portfolio  manager  on the  Arizona
Intermediate-Term Municipal investment team.

HOW DID THE FUND PERFORM FOR THE SIX MONTHS ENDED NOVEMBER 30, 1998?

     Arizona  Intermediate-Term  Municipal  provided a solid return. For the six
months ended November 30, 1998, the fund returned 3.70%, outperforming the 3.07%
return of the 78 "Other States  Intermediate  Municipal  Debt Funds"  tracked by
Lipper Inc.  Arizona  Intermediate-Term  Municipal's  return also  surpassed the
3.43% return of its benchmark, the Lehman 5-Year GO Index.

     In addition,  Arizona  Intermediate-Term  Municipal's  one- and  three-year
returns  placed it in the top 20% of its  Lipper  category,  while  life-of-fund
returns were higher than any of its peers. (See Total Returns on page 4 for fund
performance comparisons.)

HOW DID ARIZONA INTERMEDIATE-TERM MUNICIPAL'S YIELD STACK UP?

     The fund offered investors  significantly more federal tax-free income than
the average  intermediate  municipal debt fund. The most common way of gauging a
fund's income is by looking at its 30-day SEC yield.  This yield  represents net
investment  income  earned over a 30-day  period and is  expressed  as an annual
percentage rate based on the fund's share price at the end of the 30 days.

     As of November 30, Arizona  Intermediate-Term  Municipal's 30-day SEC yield
was 3.68%, compared with the 3.34% average yield of other intermediate municipal
debt funds.

WHAT FUELED THE FUND'S PERFORMANCE?

     Effective   duration    management--controlling   the   portfolio's   price
sensitivity  to  changes  in  interest   rates--continued  to  be  an  important
contributor.  We kept the portfolio's  duration slightly longer than that of the
average  intermediate  municipal  debt fund  throughout  the  six-month  period.
(Remember,  the longer the fund's duration,  the more its share price rises when
rates fall;  however,  a longer  duration  also causes the fund's share price to
fall more when rates rise.) We chose this position because we strongly  believed
that global  pressures  and benign  inflation  would lead to lower rates,  which
proved to be the case.

     But we certainly can't predict the short-term  direction of interest rates.
Therefore,  even when we feel  strongly  about the  direction in which rates are
headed, we manage Arizona Intermediate-Term Municipal's duration conservatively.
This prevents returns from fluctuating wildly from period to period.

     Generally  speaking,  we keep  duration in a narrow band around the average
duration of other  intermediate  municipal  debt  funds.  For  example,  we kept
duration around 5.6 years for most of the six-month period, only slightly longer
than the average duration of the fund's peers.

[right margin]

"THE FUND OFFERED INVESTORS SIGNIFICANTLY MORE FEDERAL TAX-FREE INCOME THAN THE
AVERAGE INTERMEDIATE MUNICIPAL DEBT FUND."

YIELDS AS OF NOVEMBER 30, 1998
  30-DAY SEC YIELD
                                  3.68%
  30-DAY TAX-EQUIVALENT YIELDS
    31.02% TAX BRACKET            5.33%
    33.90% TAX BRACKET            5.57%
    34.59% TAX BRACKET            5.63%
    39.33% TAX BRACKET            6.07%

PORTFOLIO AT A GLANCE
                                11/30/98          5/31/98
NUMBER OF SECURITIES               50                42
WEIGHTED AVERAGE
  MATURITY                       9.3 YRS           8.3 YRS
AVERAGE DURATION                 5.5 YRS           5.3 YRS
EXPENSE RATIO                    0.52%*             0.54%

* Annualized.

Investment terms are defined in the Glossary on page 17.


                                                  www.americancentury.com      5


Arizona Intermediate-Term--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

IF NOT THROUGH AGGRESSIVE DURATION MANAGEMENT, THEN HOW DO YOU ENHANCE RETURNS?

     Simply  put,  we stay on top of the market and search  diligently  for good
values.  Finding  securities  that we believe are undervalued is a top priority.
Adding undervalued securities to the portfolio can significantly enhance returns
while often adding little or no risk. That was primarily how we enhanced returns
during the six-month period.

     Take advantage of opportunities when we find them, we keep a portion of the
portfolio in very liquid  municipals--ones  we can sell quickly to generate cash
to buy new, undervalued securities.  Typically,  these sales generate very small
capital  gains or losses  for the fund,  which  helps  prevent  excess  year-end
distributions.

HOW DO YOU FIND THESE UNDERVALUED SECURITIES?

     Our experienced research team plays a pivotal role by helping us stay close
to Arizona municipal credit trends. Arizona is a complex,  dynamic state, making
thorough  research  and analysis of its  municipalities  a vital  ingredient  to
Arizona Intermediate-Term Municipal's success.

     After we find what we  believe  is an  attractively  valued  security,  our
research team provides input on the credit quality of the issuer.  If the credit
story passes our rigorous standards,  we add the security to the portfolio.  Our
credit  team can also  instigate  the  process--the  team  often  uncovers  such
securities while watching the market.

     These  securities often appreciate in value as a result of credit upgrades.
The whole  process  helps us stay in front of what we call the  "upgrade  curve"
(the chance for  securities  to  appreciate  in value  relative to their current
prices as a result of a credit upgrade).

THE STUDENTS FIRST ACT OF 1998 PASSED ON JULY 9, 1998. HOW HAS THIS LEGISLATION
AFFECTED THE ARIZONA MUNICIPAL MARKET?

     The Students FIRST Act (for more information  please read the fund's annual
report for the period  ended May 31,  1998)  affects how school  districts  will
issue  debt in the  future  but  does not  directly  impact  existing  municipal
securities.  Within the next few years,  the  legislation may sizably reduce the
number of general obligation bonds issued by school districts.

     As  we  predicted,  the  act  has  had  little  impact  on  the  market  so
far--municipal   issuance   remained  high,   providing  plenty  of  outstanding
municipals from which to choose.  However,  the longer-term  effects of Students
FIRST are much more difficult to predict. To minimize the impact on the fund, we
will continue to carefully monitor  developments and remain poised to respond to
any changes.

[left margin]

"AS WE PREDICTED, THE STUDENTS FIRST ACT HAS HAD LITTLE IMPACT ON THE MARKET
SO FAR. . ."

TOP FIVE SECTORS (AS OF 11/30/98)
                           % OF FUND INVESTMENTS
GO                                   54%
HOSPITAL REVENUE                      7%
COPS/LEASES                           7%
SPECIAL TAX REVENUE                   6%
WATER AND SEWER REVENUE               5%

TOP FIVE SECTORS (AS OF 5/31/98)
                           % OF FUND INVESTMENTS
GO                                   52%
TRANSPORTATION REVENUE               12%
COPS/LEASES                           9%
SPECIAL TAX REVENUE                   7%
HOSPITAL REVENUE                      4%


6      1-800-345-2021


Arizona Intermediate-Term--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

LOOKING AHEAD TO THE NEXT SIX MONTHS, WHAT'S IN STORE FOR THE MUNICIPAL MARKET?

     We think the next six months will be fairly  upbeat for  Arizona  municipal
investors.  On the inflation  front,  all is  quiet--for  the first 11 months of
1998,  overall  consumer  prices  crawled ahead at an  annualized  rate of 1.6%.
Global crises drove interest rates lower and led to short-term  rate  reductions
by the Federal Reserve (see page 3).

     Another  important  factor  working in favor of municipal  investors is the
relative  performance  of municipal  and Treasury  securities.  Global  economic
turmoil,  equity-market  volatility,  presidential impeachment proceedings,  and
problems in the Persian Gulf caused demand for U.S.  Treasury  securities to far
outstrip  demand  for  municipals  during the past six  months.  This has driven
municipal yields to historically  high ratios compared with  comparable-maturity
Treasury yields.

     For  example,  longer-term  municipal  yields  were nearly 100% of Treasury
yields by the end of November. Historically speaking, that ratio has been closer
to 83%. The value  disparity  means that even  investors in a relatively low tax
bracket will generally  receive more after-tax income from municipal bonds right
now than from comparable-maturity Treasurys.

     When demand for Treasurys  eventually  tapers off, we expect  municipals to
outperform  Treasurys as their yield  relationship  returns to more historically
normal ratios.

GIVEN THAT OUTLOOK, WHAT ARE YOUR PLANS FOR ARIZONA INTERMEDIATE-TERM MUNICIPAL

     For now, we plan to maintain a slightly  long  duration  compared  with the
average  intermediate  municipal fund. If interest rates continue to fall, or if
demand for municipal  securities  rises, the portfolio's  longer duration should
boost  returns.  In addition,  we will  continue to keep an eye on  developments
surrounding the Students FIRST Act of 1998.

[right margin]

"ANOTHER IMPORTANT FACTOR WORKING IN FAVOR OF MUNICIPAL INVESTORS IS THE
RELATIVE PERFORMANCE OF MUNICIPAL AND TREASURY SECURITIES."

PORTFOLIO COMPOSITION BY CREDIT RATING
             % OF FUND INVESTMENTS
            AS OF             AS OF
          11/30/98           5/31/98
AAA          60%               58%
AA           26%               25%
A             9%                9%
BBB           5%                8%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 16
for more information.

". . .WE WILL CONTINUE TO KEEP AN EYE ON DEVELOPMENTS SURROUNDING THE STUDENTS
FIRST ACT OF 1998."


                                                  www.americancentury.com      7


Arizona Intermediate-Term--Sch. of Investments
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--96.9%
ARIZONA -- 91.9%
               $1,000,000  Arizona Transportation Board
                              Highway Rev., Series 1993 A,
                              6.00%, 7/1/08                       $  1,138,680
                  900,000  Coconino & Yavapai Counties
                              Joint Unified School District
                              No. 9, Series 1994 C, (Sedona
                              Project of 1992), 5.60%,
                              7/1/06 (FGIC)                            957,609
                1,000,000  East Valley Institute of Technology
                              No. 401 GO, 5.00%, 7/1/03
                              (AMBAC)                                1,050,680
                  545,000  Gilbert County GO, Series 1994 C,
                              6.00%, 7/1/02 (MBIA)                     586,240
                1,200,000  Glendale Industrial Development
                              Auth. Rev., Series 1998 A,
                              (Midwestern University), 5.375%,
                              5/15/28                                1,200,984
                  875,000  Goodyear GO, 4.60%, 7/1/11
                              (FGIC)                                   884,643
                1,370,000  Maricopa County COP, 5.625%,
                              6/1/00                                 1,393,345
                  500,000  Maricopa County GO, 6.25%,
                              7/1/03 (FGIC)                            550,760
                1,000,000  Maricopa County Hospital Rev.,
                              (Sun Health Corp.), 5.75%,
                              4/1/07                                 1,078,450
                1,000,000  Maricopa County Industrial
                              Development Auth. Hospital
                              Facilities Rev., (Mayo Clinic
                              Hospital), 5.25%, 11/15/37             1,008,980
                  500,000  Maricopa County Industrial
                              Development Auth. Hospital
                              Facilities Rev., (Samaritan
                              Health Services), 7.15%,
                              12/1/04 (MBIA)                           580,280
                1,000,000  Maricopa County Unified School
                              District No. 1 GO, (Phoenix
                              Elementary), 5.50%, 7/1/09
                              (MBIA)                                 1,094,180
                1,000,000  Maricopa County Unified School
                              District No. 201 GO, Series
                              1992 E, (Phoenix), 7.10%,
                              7/1/04                                 1,158,860
                  800,000  Maricopa County Unified School
                              District No. 40 GO, Series
                              1995 C, 7.75%, 7/1/06 (FGIC)             988,568
                  500,000  Maricopa County Unified School
                              District No. 11 GO, Series
                              1998 C, (Peoria University),
                              4.50%, 7/1/10 (FGIC)                     506,525
                1,000,000  Maricopa County Unified School
                              District No. 41 GO, Series
                              1988 F, (Gilbert), 6.20%,
                              7/1/02, Prerefunded at 100%
                              of Par (FGIC)(1)                       1,083,380

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
              $   180,000  Maricopa County Unified School
                              District No. 69 GO, Series
                              1998 F, (Paradise Valley School
                              Improvement Project 94), 4.00%,
                              7/1/04 (FSA)                         $   181,296
                1,000,000  Maricopa County Unified School
                              District No. 48 GO, (Scottsdale),
                              6.60%, 7/1/12                          1,214,530
                1,000,000  Maricopa County Unified School
                              District No. 6 GO, Series
                              1997 B, (Washington
                              Elementary), 4.75%, 7/1/11
                              (FGIC)                                 1,018,680
                  500,000  Maricopa County Unified School
                              District No. 80 GO, (Chandler),
                              5.20%, 7/1/13 (MBIA)                     531,875
                1,000,000  Maricopa County Unified School
                              District No. 80 GO, Series
                              1998 E, (Chandler), 4.75%,
                              7/1/11 (FGIC)                          1,024,610
                1,000,000  Maricopa County Unified School
                              District No. 90 GO, (Ruth Fisher
                              Elementary), 5.375%, 7/1/00            1,026,550
                1,000,000  Maricopa County Unified School
                              District No. 97 GO, (Deer Valley),
                              Series 1996 A, 6.25%, 7/1/06
                              (MBIA)                                 1,141,370
                  500,000  Mesa Industrial Development Auth.
                              Rev., Series A-1, (Lutheran
                              Health Systems), 4.00%,
                              1/1/00 (MBIA)                            503,345
                  300,000  Phoenix Airport Rev., Series
                              1994 C, 5.50%, 7/1/01 (MBIA)             313,077
                1,000,000  Phoenix Civic Improvement Corp.
                              Rev., (Senior Lien), 5.00%,
                              7/1/03                                 1,044,260
                1,000,000  Phoenix Civic Improvement Corp.
                              Wastewater System Lease Rev.,
                              4.85%, 7/1/07 (MBIA)                   1,048,770
                  550,000  Phoenix GO, 6.00%, 7/1/01                   582,367
                1,000,000  Phoenix GO, Series 1995 B,
                              5.00%, 7/1/09                          1,059,720
                1,100,000  Phoenix Industrial Development
                              Auth. Single Family Mortgage
                              Rev., Series 1998 A, 6.60%,
                              12/1/29
                              (GNMA/FNMA/FHLMC)                      1,205,996
                  500,000  Phoenix Street and Highway Rev.,
                              5.95%, 7/1/00                            519,770
                1,000,000  Pima County Sewer Rev., 6.20%,
                              7/1/00 (FGIC)                          1,043,080
                1,000,000  Pima County Unified School
                              District No. 10 GO,
                              (Amphitheater), 4.25%, 7/1/06
                              (MBIA)                                 1,015,210
                1,000,000  Pima County Unified School
                              District No. 10 GO,
                              (Amphitheater), 5.75%, 7/1/04,
                              (FGIC)                                 1,093,330

                                              See Notes to Financial Statements


8      1-800-345-2021


Arizona Intermediate-Term--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
               $1,000,000  Pima County Unified School
                              District No. 10 GO,
                              (Amphitheater), 7.00%, 7/1/05
                              (MBIA)                              $  1,171,200
                1,000,000  Pima County Unified School
                              District No. 12 GO, (Sunnyside),
                              5.50%, 7/1/09 (MBIA)                   1,077,200
                1,200,000  Pima County Unified School
                              District No. 16 GO, (Catalina
                              Foothills), 5.75%, 7/1/06
                              (MBIA)                                 1,333,296
                1,000,000  Salt River Project Agricultural
                              Improvement and Power District
                              Rev., Series 1993 B, 6.50%,
                              1/1/04                                 1,119,100
                  480,000  Scottsdale GO, 7.50%, 7/1/02                540,024
                1,000,000  Scottsdale Water & Sewer Rev.,
                              Series 1998 E, 4.50%, 7/1/23             939,760
                1,250,000  Sedona Wastewater Municipal
                              Property Corporate Excise Tax
                              Rev., 5.12%, 7/1/20 (MBIA)(2)            425,950
                1,275,000  Tempe GO, 6.25%, 7/1/05                   1,441,579
                  525,000  Tucson COP, 5.70%, 7/1/02                   529,914
                1,000,000  Tucson Street and Highway Rev.,
                              5.70%, 7/1/01                          1,052,010
                  500,000  Yavapai County Unified School
                              District No. 28 GO, (Camp
                              Verde), 6.10%, 7/1/04 (FGIC)             554,585
                                                                  -------------
                                                                    41,014,618
                                                                  -------------
PUERTO RICO--3.8%
                1,000,000  Puerto Rico Commonwealth GO,
                              5.75%, 7/1/11 (MBIA)                   1,134,030

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
              $   500,000  Puerto Rico Commonwealth
                              Infrastructure Financing Auth.
                              Special Tax Rev., Series 1998 A,
                              5.50%, 7/1/08 (AMBAC)                $   554,800
                                                                  -------------
                                                                     1,688,830
                                                                  -------------
VIRGIN ISLANDS--1.2%
                  500,000  Virgin Islands Water & Power
                              Auth. Electric System Rev.,
                              5.125%, 7/1/04                           520,980
                                                                  -------------
TOTAL MUNICIPAL SECURITIES                                          43,224,428
                                                                  -------------
   (Cost $41,571,315)

SHORT-TERM MUNICIPAL SECURITIES--3.1%
ARIZONA
                1,000,000  Maricopa County Pollution Control
                              Rev., Series 1994 E, (Arizona
                              Public Service Company), VRDN,
                              3.35%, 12/1/98 (LOC: Bank
                              of America N.T. & S.A.)                1,000,000
                  400,000  Pinal County Industrial
                              Development Auth. Pollution
                              Control Rev., (Newmont), VRDN,
                              3.15%, 12/1/98 (LOC:
                              National Westminster Bank PLC)           400,000
                                                                  -------------
TOTAL SHORT-TERM MUNICIPAL SECURITIES                                1,400,000
                                                                  -------------
   (Cost $1,400,000)

TOTAL INVESTMENT SECURITIES-100.0%                                 $44,624,428
                                                                  =============
   (Cost $42,971,315)

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

COP = Certificates of Participation

FGIC = Financial Guaranty Insurance Co.

FHLMC = Federal Home Loan Mortgage Corp.

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GNMA = Government National Mortgage Association

GO = General Obligation

LOC = Letter of Credit

MBIA = MBIA Insurance Corp.

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
     calculating  the  weighted  average  portfolio  maturity.   Rate  shown  is
     effective November 30, 1998.

(1)  Escrowed to maturity in U.S. government securities.

(2)  Security is a zero-coupon municipal bond. The yield to maturity at purchase
     is indicated. Zero-coupn bonds are purchased at a substantial discount from
     their value at maturity.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the percent and dollar breakdown of each investment category

See Notes to Financial Statements


                                                  www.americancentury.com      9


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

ASSETS
Investment securities, at value
  (identified cost of $42,971,315)
  (Note 3) ................................................          $44,624,428
Cash ......................................................                5,676
Receivable for investments sold ...........................            1,000,000
Interest receivable .......................................              861,594
                                                                     -----------
                                                                      46,491,698
                                                                     -----------

LIABILITIES
Disbursements in excess of
  demand deposit cash .....................................            1,537,056
Payable for investments purchased .........................              928,215
Payable for capital shares redeemed .......................               10,988
Dividends payable .........................................               15,326
Accrued management fees
  (Note 2) ................................................               18,045
Payable for Trustees' fees
  and expenses ............................................                  163
                                                                     -----------
                                                                       2,509,793
                                                                     -----------
Net Assets ................................................          $43,981,905
                                                                     ===========

CAPITAL SHARES
Outstanding (unlimited number
  of shares authorized) ...................................            4,061,658
                                                                     ===========
Net Asset Value Per Share .................................          $     10.83
                                                                     ===========

NET ASSETS CONSIST OF:
Capital paid in ...........................................          $42,060,764
Accumulated undistributed net
  realized gain on investment
  transactions ............................................              268,028
Net unrealized appreciation
  on investments (Note 3) .................................            1,653,113
                                                                     -----------
                                                                     $43,981,905
                                                                     ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of shares  outstanding  gives you the price of an individual  share,  or the net
asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
gains  earned on  investment  activity but not yet paid to  shareholders  or net
losses on investment activity (known as realized gains or losses);  and gains or
losses on securities  still owned by the fund (known as unrealized  appreciation
or  depreciation).  This  breakdown  tells you the value of net assets  that are
performance-related,  such as investment  gains or losses,  and the value of net
assets that are not related to performance,  such as shareholder investments and
redemptions.

                                              See Notes to Financial Statements


10      1-800-345-2021


Statement of Operations
- --------------------------------------------------------------------------------

FOR THE SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED)

INVESTMENT INCOME
Income:
Interest ..................................................           $  986,300
                                                                      ----------
Expenses (Note 2):
Management fees ...........................................              103,873
Trustees' fees and expenses ...............................                2,239
                                                                      ----------
                                                                         106,112
                                                                      ----------
Net investment income .....................................              880,188
                                                                      ----------

REALIZED AND UNREALIZED
GAIN ON INVESTMENTS (NOTE 3)
Net realized gain on investments ..........................              184,418
Change in net unrealized
  appreciation on investments .............................              420,549
                                                                      ----------
Net realized and unrealized
  gain on investments .....................................              604,967
                                                                      ----------
Net Increase in Net Assets
  Resulting from Operations ...............................           $1,485,155
                                                                      ==========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized appreciation or
  depreciation)

See Notes to Financial Statements


                                                 www.americancentury.com      11


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED) AND  YEAR ENDED MAY 31, 1998

                                                    NOVEMBER 30,      MAY 31,
                                                      1998             1998
Increase in Net Assets

OPERATIONS
Net investment income ....................      $    880,188       $  1,553,800
Net realized gain on investments .........           184,418            247,543
Change in net unrealized
  appreciation on investments ............           420,549            622,539
                                                ------------       ------------
Net increase in net assets
  resulting from operations ..............         1,485,155          2,423,882
                                                ------------       ------------

DISTRIBUTIONS TO
SHAREHOLDERS
From net investment income ...............          (880,188)        (1,553,800)
From net realized gains on
  investment transactions ................              --             (163,355)
                                                ------------       ------------
Decrease in net assets
  from distributions .....................          (880,188)        (1,717,155)
                                                ------------       ------------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ................         8,601,476         18,049,886
Proceeds from reinvestment
  of distributions .......................           647,056          1,285,629
Payments for shares redeemed .............        (5,918,930)       (10,549,469)
                                                ------------       ------------
Net increase in net assets from
  capital share transactions .............         3,329,602          8,786,046
                                                ------------       ------------
Net increase in net assets ...............         3,934,569          9,492,773


NET ASSETS
Beginning of period ......................        40,047,336         30,554,563
                                                ------------       ------------
End of period ............................      $ 43,981,905       $ 40,047,336
                                                ============       ============

TRANSACTIONS IN
SHARES OF THE FUND
Sold .....................................           798,417          1,695,769
Issued in reinvestment
  of distributions .......................            60,113            120,777
Redeemed .................................          (550,466)          (989,926)
                                                ------------       ------------
Net increase .............................           308,064            826,620
                                                ============       ============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
  redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital share  transactions  results in net
assets at the end of the period.

                                              See Notes to Financial Statements


12      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     ORGANIZATION--American  Century  Municipal  Trust (the Trust) is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company. American Century - Benham Arizona Intermediate-Term Municipal Fund (the
Fund) is one of the eight funds issued by the Trust. The Fund is non-diversified
under  the 1940  Act.  The  objective  of the Fund is to seek as high a level of
current  income exempt from federal  income taxes as is consistent  with prudent
investment  management  and  conservation  of  shareholders'  capital.  The Fund
invests primarily in Arizona intermediate-term  municipal obligations.  The Fund
concentrates  its  investments  in a single  state and  therefore  may have more
exposure  to credit  risk  related  to the state of  Arizona  than a fund with a
broader  geographical  diversification.  The  following  significant  accounting
policies are in accordance with generally accepted accounting principles.

     SECURITY  VALUATIONS--Securities  are valued  through a commercial  pricing
service or at the mean of the most recent bid and asked prices.  When valuations
are not readily available,  securities are valued at fair value as determined in
accordance with procedures adopted by the Board of Trustees.

     SECURITY  TRANSACTIONS--Security  transactions  are accounted for as of the
trade date. Net realized gains and losses are determined on the identified  cost
basis, which is also used for federal income tax purposes.

     INVESTMENT  INCOME--Interest  income is recorded  on the accrual  basis and
includes accretion of discounts and amortization of premiums.

     INCOME TAX STATUS--It is the Fund's policy to distribute all net investment
income and net realized  gains to  shareholders  and to  otherwise  qualify as a
regulated  investment company under the provisions of the Internal Revenue Code.
Accordingly, no provision has been made for federal or state income taxes.

     DISTRIBUTIONS TO SHAREHOLDERS--Distributions from net investment income are
declared daily and distributed  monthly.  Distributions  from net realized gains
are declared and paid annually.

     On December 11, 1998,  the Fund declared and paid a dividend of $0.0648 per
share from  short-term  net realized gains on  investments  to  shareholders  of
record on that date.

     The  character of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes.  These differences  reflect the differing character
of certain income items and net capital gains and losses for financial statement
and tax  purposes  and may  result in  reclassification  among  certain  capital
accounts.

     FUTURES  CONTRACTS--The  Fund  may  buy  and  sell  interest  rate  futures
contracts  relating to debt  securities  and write and buy put and call  options
relating  to  interest  rate  futures  contracts.  The Fund may use  futures and
options  transactions  to maintain cash reserves while remaining fully invested,
to  facilitate  trading,  to  reduce  transaction  costs,  or to  pursue  higher
investment  returns when a futures contract is priced more attractively than its
underlying  security  or  index.  One of the  risks  of  entering  into  futures
contracts may include the possibility  that the changes in value of the contract
may not correlate with the changes in value of the underlying  securities.  Upon
entering into a futures contract, the Fund is required to deposit either cash or
securities  in an amount equal to a certain  percentage  of the  contract  value
(initial margin).  Subsequent  payments  (variation margin) are made or received
daily,  in cash, by the Fund. The variation  margin is equal to the daily change
in the contract  value and is recorded as an unrealized  gain or loss.  The Fund
recognizes a realized gain or loss when the contract is closed or expires. There
were no open futures contracts at November 30, 1998.

     ADDITIONAL  INFORMATION--Funds  Distributor,  Inc.  (FDI)  is  the  Trust's
distributor. Certain officers of FDI are also officers of the Trust.


                                                 www.americancentury.com      13


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

     The Trust has entered into a Management  Agreement  with ACIM that provides
the Fund with  investment  advisory  and  management  services in exchange for a
single,  unified  management  fee.  Expenses  excluded  from the  agreement  are
brokerage,  taxes,  portfolio  insurance,  interest,  fees and expenses of those
Trustees  who  are  not  considered  "interested  persons"  as  defined  in  the
Investment  Company  Act of 1940  (including  counsel  fees)  and  extraordinary
expenses. The annual rate at which this fee is assessed is determined monthly in
a two-step  process:  First, a fee rate schedule is applied to the net assets of
all of the funds in the Fund's  investment  category  which are  managed by ACIM
(the "Investment  Category Fee"). The overall investment  objective of each Fund
determines its Investment  Category.  The three  investment  categories are: the
Money  Market  Fund  Category,  the Bond  Fund  Category,  and the  Equity  Fund
Category. The Fund is included in the Bond Fund Category. Second, a separate fee
rate  schedule is applied to the net assets of all of the funds  managed by ACIM
(the "Complex  Fee").  The Investment  Category Fee and the Complex Fee are then
added to determine the unified  management  fee rate. The management fee is paid
monthly by the Fund based on its average  daily  closing  net assets  during the
previous month multiplied by the monthly management fee rate.


     The annualized Investment Category Fee schedule for the Fund is as follows

     0.2800% of the first $1 billion 
     0.2280% of the next $1 billion 
     0.1980% of the next $3 billion 
     0.1780% of the next $5 billion 
     0.1650% of the next $15 billion 
     0.1630% of the next $25 billion
     0.1625% of the average daily net assets over $50 billion

     The annualized Complex Fee schedule is as follows:

     0.3100% of the first $2.5 billion 
     0.3000% of the next $7.5 billion 
     0.2985% of the next $15 billion 
     0.2970% of the next $25 billion 
     0.2960% of the next $50 billion 
     0.2950% of the next $100 billion 
     0.2940% of the next $100 billion 
     0.2930% of the next $200 billion 
     0.2920% of the next $250 billion
     0.2910% of the next $500 billion
     0.2900% of the average daily net assets over $1,250 billion

     Certain  officers  and  trustees  of the  Trust  are also  officers  and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the Trust's  investment  manager,  ACIM, and the
Trust's transfer agent, American Century Services Corporation.

- --------------------------------------------------------------------------------
3. INVESTMENT TRANSACTIONS

     Purchases and sales of municipal  debt  obligations,  excluding  short-term
investments, totaled $18,006,694 and $14,601,757, respectively.

     As of November  30,  1998,  accumulated  net  unrealized  appreciation  was
$1,653,113,  which  consisted of  unrealized  appreciation  of  $1,677,506,  and
unrealized  depreciation  of $24,393.  The  aggregate  cost of  investments  for
federal  income tax  purposes was the same as the cost for  financial  reporting
purposes.

- --------------------------------------------------------------------------------
4. BANK LOANS

     Effective  December 18,  1998,  the Fund,  along with  certain  other funds
managed by ACIM,  entered  into an  unsecured  $570,000,000  bank line of credit
agreement with Chase Manhattan.  Borrowings under the agreement bear interest at
the Federal Funds rate plus 0.40%.


14      1-800-345-2021


Arizona Intermediate-Term--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
    FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31 (EXCEPT AS NOTED)

                                    1998(1)            1998           1997           1996           1995          1994(2)
PER-SHARE DATA
Net Asset Value,
<S>                              <C>               <C>            <C>            <C>            <C>            <C>       
Beginning of Period ..........   $    10.67        $    10.44     $    10.31     $    10.35     $    10.13     $    10.00
                                 ----------        ----------     ----------     ----------     ----------     ----------
Income From Investment
Operations
  Net Investment Income ......         0.23              0.46           0.45           0.51           0.51           0.07
  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ...............         0.16              0.28           0.13          (0.03)          0.22           0.13
                                 ----------        ----------     ----------     ----------     ----------     ----------
  Total From
  Investment Operations ......         0.39              0.74           0.58           0.48           0.73           0.20
                                 ----------        ----------     ----------     ----------     ----------     ----------
Distributions
  From Net Investment Income .        (0.23)            (0.46)         (0.45)         (0.51)         (0.51)         (0.07)
  From Net Realized Gains on
  Investment Transactions ....         --               (0.05)          --            (0.01)          --             --
                                 ----------        ----------     ----------     ----------     ----------     ----------
  Total Distributions ........        (0.23)            (0.51)         (0.45)         (0.52)         (0.51)         (0.07)
                                 ----------        ----------     ----------     ----------     ----------     ----------
Net Asset Value,
End of Period ................   $    10.83        $    10.67     $    10.44     $    10.31     $    10.35     $    10.13
                                 ==========        ==========     ==========     ==========     ==========     ==========
  Total Return(3) ............         3.70%             7.19%          5.77%          4.65%          7.52%          1.99%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
  to Average Net Assets ......         0.52%(4)          0.54%          0.66%          0.14%          --             --
Ratio of Operating Expenses
  to Average Net Assets
  (Before Expense Waiver) ....         0.52%(4)          0.60%          0.79%          0.82%          1.01%          2.33%(4)
Ratio of Net Investment
  Income to Average Net Assets         4.29%(4)          4.33%          4.35%          4.85%          5.16%          5.08%(4)
Ratio of Net Investment
  Income to Average Net Assets
  (Before Expense Waiver) ....         4.29%(4)          4.27%          4.22%          4.17%          4.15%          2.75%(4)
Portfolio Turnover Rate ......           36%               39%            81%            36%            33%            18%
Net Assets, End
of Period (in thousands) .....   $   43,982        $   40,047     $   30,555     $   25,789     $   19,778     $    7,187
</TABLE>

(1) Six months ended November 30, 1998 (unaudited).

(2) April 11, 1994 (inception) through May 31, 1994.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  statement itemizes current period
activity and  statistics and provides  comparison  data for the last five fiscal
years (or less, if the fund is not five years old).

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming
  reinvestment of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced

See Notes to Financial Statements


                                                 www.americancentury.com      15


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     The Benham Group offers 38  fixed-income  funds,  ranging from money market
funds to long-term bond funds and including  both taxable and tax-exempt  funds.
Each fund is  managed  to  provide  a "pure  play" on a  specific  sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's  portfolio  is tied to a specific  market  index.  Fund  managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

     In addition to these principles, each fund has its own investment policies:

     Arizona Intermediate-Term Municipal seeks to provide interest income exempt
from both  Arizona and federal  income  taxes.  The fund  invests  primarily  in
intermediate-term  Arizona municipal  securities with maturities of four or more
years and maintains a weighted average maturity of 5-10 years.

     Depending  on your tax  status,  investment  income  may be  subject to the
federal  alternative  minimum  tax.  Capital  gains are not exempt from  federal
income tax.

COMPARATIVE INDICES

     The following index is used in the report as a fund performance comparison.
It is not an investment product available for purchase.

     The Lehman 5-Year  Municipal  General  Obligation Index is a municipal bond
index  composed of more than 11,000 bonds with  maturities of four to six years.
The bonds are rated BBB or higher by Standard & Poor's,  with an average  rating
of AA. The average maturity of the index is five years.

LIPPER RANKINGS

     LIPPER INC. is an independent mutual fund ranking service. Rankings are
based on average annual total returns for each fund in a given category for the
periods indicated. Rankings are not included for periods less than one year.

     The funds in  Lipper's  OTHER  STATES  INTERMEDIATE  MUNICIPAL  DEBT  FUNDS
category invest in municipal debt issues with dollar-weighted average maturities
of 5-10 years and which are exempt from  taxation  on a specified  city or state
basis.

CREDIT RATING GUIDELINES

     Credit  ratings  are  issued  by  independent  research  companies  such as
Standard  & Poor's  and  Moody's.  Ratings  are based on an  issuer's  financial
strength and ability to pay interest and principal in a timely manner.

     It's important to note that credit ratings are  subjective,  reflecting the
opinions of the rating agencies; they are not absolute standards of quality.

     Securities  rated  AAA,  AA, A or BBB are  considered  "investment  grade,"
meaning they're relatively safe from default.

[left margin]

INVESTMENT TEAM LEADERS
  PORTFOLIO MANAGERS
     KEN SALINGER
     COLLEEN DENZLER
  MUNICIPAL CREDIT RESEARCH DIRECTOR
     STEVEN PERMUT


16      1-800-345-2021


Glossary
- --------------------------------------------------------------------------------

RETURNS

* TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on page 15.

YIELDS

* 30-DAY SEC YIELD  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annual percentage rate based on the fund's share
price at the end of the 30-day  period.  The SEC yield  should be regarded as an
estimate of the fund's investment income, and it may not equal the fund's actual
income  distribution  rate, the income paid to a shareholder's  account,  or the
income reported in the fund's financial statements.

*  TAX-EQUIVALENT  YIELDS show the taxable  yields that  investors in a combined
federal and Arizona  state income tax bracket would have to earn before taxes to
equal the fund's tax-free yield.

INVESTMENT TERMS

* BASIS POINT--a basis point equals one  one-hundredth of a percentage point (or
0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

* YIELD CURVE--a graphic representation of the relationship between maturity and
yield  for  fixed-income   securities.   Yield  curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

PORTFOLIO STATISTICS

* NUMBER OF SECURITIES--the  number of different  securities issuances held by a
fund on a given date.

*  WEIGHTED  AVERAGE  MATURITY  (WAM)--a  measurement  of the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio mature, weighted by dollar amount.

*  AVERAGE  DURATION--another  measure  of  the  sensitivity  of a  fixed-income
portfolio to interest rate changes.  Duration is a time-weighted  average of the
interest and principal payments of the securities in a portfolio.

* EXPENSE RATIO--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder's  account.  (See Note 2 in
the Notes to Financial Statements.)

TYPES OF MUNICIPAL SECURITIES

*  COPS/LEASES--securities  issued to finance public property improvements (such
as city halls and police  stations) and  equipment  purchases.  Certificates  of
participation  represent long-term debt obligations,  while leases have a higher
risk profile than GOs because they require annual appropriation.

*    GO BONDS--general obligation securities backed by the taxing power of the
issuer.

*  LAND-SECURED  BONDS--securities  such as Mello-Roos  bonds and 1915-Act bonds
that are issued to finance real estate development projects.

* PREREFUNDED BONDS/ETM BONDS--securities  refinanced or escrowed to maturity by
the issuer because of their premium coupons (higher-than-market interest rates).
These  bonds  tend to have  higher  credit  ratings  because  they are backed by
Treasury securities.

*  REVENUE  BONDS--securities  backed by  revenues  from  sales  taxes or from a
specific project, system, or facility (such as a hospital,  electric utility, or
water system).


                                                 www.americancentury.com      17


Notes
- --------------------------------------------------------------------------------


18      1-800-345-2021


Notes
- --------------------------------------------------------------------------------


                                                 www.americancentury.com      19


Notes
- --------------------------------------------------------------------------------


20      1-800-345-2021


[inside back cover]

AMERICAN CENTURY FUNDS
- -------------------------------------------------------------------------------

BENHAM GROUP(reg.sm)
TAXABLE BOND FUNDS
U.S. TREASURY & GOVERNMENT
   Short-Term Treasury
   Short-Term Government
   GNMA
   Intermediate-Term Treasury
   Long-Term Treasury
   Inflation-Adjusted Treasury
   Target Maturities Trust: 2000
   Target Maturities Trust: 2005
   Target Maturities Trust: 2010
   Target Maturities Trust: 2015
   Target Maturities Trust: 2020
   Target Maturities Trust: 2025
CORPORATE & DIVERSIFIED
   Limited-Term Bond
   Intermediate-Term Bond
   Bond
   Premium Bond
   High-Yield Bond
INTERNATIONAL
   International Bond

TAX-FREE & MUNICIPAL BOND FUNDS
MULTIPLE-STATE
   Limited-Term Tax-Free
   Intermediate-Term Tax-Free
   Long-Term Tax-Free
   High-Yield Municipal
SINGLE-STATE
   Arizona Intermediate-Term Municipal
   California High-Yield Municipal
   California Insured Tax-Free
   California Intermediate-Term Tax-Free
   California Limited-Term Tax-Free
   California Long-Term Tax-Free
   Florida Intermediate-Term Municipal

MONEY MARKET FUNDS
TAXABLE
   Capital Preservation
   Government Agency Money Market
   Premium Capital Reserve
   Premium Government Reserve
   Prime Money Market
TAX-FREE & MUNICIPAL
   California Municipal Money Market
   California Tax-Free Money Market
   Florida Municipal Money Market
   Tax-Free Money Market

AMERICAN CENTURY(reg.sm) GROUP
ASSET ALLOCATION
   Strategic Allocation: Conservative
   Strategic Allocation: Moderate
   Strategic Allocation: Aggressive
BALANCED
   Balanced
CONSERVATIVE EQUITY
   Income and Growth
   Equity Income
   Value
   Equity Growth
SPECIALTY
   Utilities
   Real Estate
   Global Natural Resources
   Global Gold
SMALL CAP
   Small Cap Quantitative
   Small Cap Value

TWENTIETH CENTURY GROUP
GROWTH
   Select
   Heritage Growth
   Ultra
AGGRESSIVE GROWTH
   Vista
   Giftrust
   New Opportunities
INTERNATIONAL GROWTH
   International Growth
   International Discovery
   Emerging Markets
GLOBAL
   Global Growth

Please call for a prospectus  or profile on any  American  Century  fund.  These
documents contain important information including charges and expenses,  and you
should read them carefully before you invest or send money.


[right margin]

[american century logo(reg.sm)]
American
Century

P.O. BOX 419200
KANSAS CITY, MISSOURI
64141-6200

INVESTOR SERVICES:
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE:
1-800-345-8765

TELECOMMUNICATIONS DEVICE FOR THE DEAF:
1-800-634-4113 OR 816-444-3485

FAX: 816-340-7962

INTERNET: WWW.AMERICANCENTURY.COM


AMERICAN CENTURY MUNICIPAL TRUST


INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI


THIS REPORT AND THE STATEMENTS IT CONTAINS  ARE SUBMITTED FOR THE GENERAL
INFORMATION  OF OUR SHAREHOLDERS. THE REPORT IS NOT  AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED  BY AN EFFECTIVE
PROSPECTUS.

FUNDS DISTRIBUTOR, INC.
(c) 1998 AMERICAN CENTURY SERVICES CORPORATION


[recycled logo]
Recycled


[back cover]


American Century Investments                                     BULK RATE
P.O. Box 419200                                              U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                   AMERICAN CENTURY
www.americancentury.com                                          COMPANIES



9901                                                    Funds Distributor, Inc.
SH-BKT-15066                      (c)1998 American Century Services Corporation
<PAGE>

[front cover]                                                 NOVEMBER 30, 1998

SEMIANNUAL REPORT
- ----------------
AMERICAN CENTURY

                              [graphic of stairs]

BENHAM GROUP
- ------------------------------------
FLORIDA MUNICIPAL MONEY MARKET

                                                 [american century logo(reg.sm)]
                                                                        American
                                                                         Century
[inside front cover]


AMERICAN CENTURY BROKERAGE
- --------------------------------------------------------------------------------

     We're pleased to introduce American Century's new brokerage service,  which
offers a wide range of investment options and features:

     *  FundChoice  Service--Invest  in over 8,000 no-load and load mutual funds
        from hundreds of different fund companies, many with no transaction fees

     *  Buy individual stocks and bonds

     *  24-hour  Internet and  automated  phone trades are just $24.95 for up to
        1,000 shares of stock, and 2 cents per share thereafter

     *  Strong research capability 

        *   Build and track model portfolios

        *   Get news, quotes and charts

        *   Check free Standard & Poor's stock reports

        *   Access Wall Street on Demand(tm),  a research service with more than
            500,000 reports on industry trends,  corporate earnings,  and mutual
            fund analysis

     *  Track your brokerage account on one easy-to-read statement

     *  Unlimited  check writing and a Gold  MasterCard(reg.tm)  ATM/debit  card
        with an American Century Brokerage Access AccountSM (minimum $10,000)

To talk with a Brokerage Associate, call 1-888-345-2071.

WHAT'S NEW . . .

    AMERICAN  CENTURY CATALOG OF TOOLS & SERVICES lists all the free educational
materials available to investors.

    We now have FOUR-PAGE  PROFILES of many of our funds.  The profiles follow a
standard SEC format and are intended to allow investors to compare funds easily.
You can request a profile or the full prospectus. Full prospectuses contain more
detailed fund information and you will continue to receive one after investing.

    In 1999, we will provide  SIMPLIFIED  PROSPECTUSES that highlight  important
information  about our funds,  including  fees and expenses.  More detailed data
will be in the Statement of Additional Information.

    To order any of these materials, please call 1-800-345-2021.

[left margin]

BENHAM GROUP
FLORIDA MUNICIPAL MONEY MARKET
(BEFXX)
- ----------------------------------


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     Money market funds such as Florida  Municipal Money Market reaffirmed their
value during the six months ended  November 30, 1998, a period of extreme market
turbulence.  Weakening economic and financial conditions, brought on by problems
in Asia, Russia,  and Latin America,  led to significant stock market volatility
and a dramatic decline in interest rates.

     Volatility was so rampant that the U.S.  central bank, the Federal Reserve,
cut short-term  interest rates three times to help stabilize markets  worldwide.
Money  market  yields fell in  anticipation  of the rate cuts,  but money market
values remained stable amid the ups and downs in bond and stock prices.

     The  third  quarter  of  1998  served  as a good  example  of the  markets'
extremes.  Several major U.S. stock indices hit record highs in mid-July  before
plunging 20% in the following six weeks. In the bond market, high demand for the
safety of Treasury  bonds pushed  yields down to their lowest  levels ever,  but
demand for  corporate  bonds  thinned  to the point  where  trading  was all but
impossible.

     This  type  of  investment  environment  illustrates  the  importance  of a
well-diversified  investment  portfolio.  Allocating  your assets among  stocks,
bonds,  and money market funds can help your portfolio  weather dramatic changes
in the economic or investment climate.

     Florida Municipal Money Market continued to provide more federal tax-exempt
income  than most of its  peers.  We  accomplished  this by  keeping  management
expenses low and  strategically  adding short-term  municipal  securities to the
portfolio  when  supply  and  demand   fluctuations   created  favorable  buying
opportunities.  Our credit  research  team also closely  monitored the financial
health of the banks that back  municipal  securities,  helping the fund managers
maintain Florida Municipal Money Market's high credit quality.

     Another situation we've been watching closely is preparation of the world's
computer  systems  for the  year  2000.  At  American  Century,  we're  devoting
substantial  resources to this endeavor.  Throughout  1999, our technology  team
will be  extensively  testing our systems,  including  those  involved with fund
performance and dividend payments.

     Thank you for your continued investment with American Century.

Sincerely,

/s/James E. Stowers, Jr.                 /s/James E. Stowers III
James E. Stowers, Jr.                    James E. Stowers III
Chairman of the Board and Founder        Chief Executive Officer


[right margin]

               Table of Contents
   Report Highlights ..........    2
   Services Update ............    3
Florida Municipal  Money Market
   Performance Information ....    4
   Management Q&A .............    5
   Schedule of Investments ....    7
Financial Statements
   Statement of Assets and
   Liabilities ................   10
   Statement of Operations ....   11
   Statements of Changes
   in Net Assets ..............   12
   Notes to Financial
   Statements .................   13
   Financial Highlights .......   15
Other Information
   Background Information
      Investment Philosophy
      and Policies ............   16
      Lipper Rankings .........   16
      Credit Rating
      Guidelines ..............   16
      Investment and Credit
      Research Teams ..........   16
   Glossary ...................   17


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

FUND HIGHLIGHTS

*   Florida  Municipal  Money  Market  continued  to  provide a higher  level of
    federal  tax-exempt  income than the average  state-specific  tax-free money
    market fund.

*   The fund's good relative  performance  could be attributed  primarily to low
    management expenses and a value approach to investing that helped maintain a
    competitive yield.

*   The  seven-day  current  yield fell  because of market  factors  that caused
    interest rates in general to decline.

*  We continue to manage the fund's credit quality conservatively. We don't take
   on inappropriate credit risk to boost the fund's yield.

MARKET HIGHLIGHTS

*   U.S. interest rates in general declined because of weakening global economic
    conditions following a series of financial crises in Asia, Russia, and
    Latin America.

*   The Federal Reserve cut short-term interest rates three times from September
    through November to stabilize the global markets and stimulate the U.S.
    economy.

*   Money market  yields  declined in  anticipation  of the Fed's  interest rate
    cuts.

*   After  successfully  stabilizing  global financial markets with its interest
    rate cuts, we expect the Fed to take a  "wait-and-see"  approach to interest
    rate policy. We won't be surprised if the Fed is done cutting interest rates
    for a while.

[left margin]

"THE FUND'S GOOD RELATIVE PERFORMANCE COULD BE ATTRIBUTED PRIMARILY TO LOW
MANAGEMENT EXPENSES AND A VALUE APPROACH TO INVESTING THAT HELPED MAINTAIN A
COMPETITIVE YIELD."

      FLORIDA MUNICIPAL MONEY MARKET
                (BEFXX)
TOTAL RETURNS:            AS OF 11/30/98
    6 Months                      1.52%*
    1 Year                         3.17%
NET ASSETS:                $94.4 million
7-DAY CURRENT YIELD:               2.95%
INCEPTION DATE:                  4/11/94

* Not annualized.

See Total Returns on page 4.
Investment terms are defined in the Glossary on page 17.


2      1-800-345-2021


Services Update
- --------------------------------------------------------------------------------

     We get many questions from money market investors about our services.  Here
are answers to several frequently asked questions.

CAN I MAKE DIRECT DEPOSITS INTO MY MONEY MARKET FUND?

     Yes. Give us a call, and we can send you the information you need to set up
direct deposit of your paycheck, Social Security check, Treasury Direct interest
payment, military allotment, or payments from other government agencies.

WHAT IS THE HOLDING PERIOD ON NEW DEPOSITS INTO MY ACCOUNT?

     Generally there is an eight-business-day holding period for deposited funds
(initial investments in a new account are held for 15 calendar days). There is a
one-day holding period for U.S.  Treasury checks,  money orders,  and travelers'
checks.

IS THERE AN EASY WAY TO MOVE MONEY FROM MY MONEY  MARKET  ACCOUNT  INTO MY STOCK
AND BOND FUND ACCOUNTS ON A REGULAR BASIS, FOR DOLLAR-COST-AVERAGING PURPOSES?

     Yes. Our "Automatic  Exchange" plan allows  regularly  scheduled  automatic
transfers  from  your  American  Century  money  market  fund  into  any of your
variable-price  American  Century stock or bond funds.  You can arrange for this
service with a phone call.

IS THERE A LIMIT TO THE NUMBER OF  EXCHANGES  I CAN MAKE OUT OF MY MONEY  MARKET
FUND?

     If you are  exchanging  from your money market fund into your bond or stock
fund, there is no limit. However, there is a limit of six exchanges per calendar
year out of your bond and stock funds.

     Exchanges can be made by:

     * calling an Investor Services Representative at 1-800-345-2021

     * calling our Automated Information Line at 1-800-345-8765*

     * writing us a letter

     * visiting our Web site at
       www.americancentury.com*

IS THERE A FEE FOR WRITING CHECKS AGAINST MY MONEY MARKET FUND?

     No. You can write as many checks as you like at no charge, as long as each
check is for $100 or more.

IF  YOU  HAVE  ANY  QUESTIONS   ABOUT  OUR  SERVICES,   CALL  US  TOLL  FREE  AT
1-800-345-2021 OR E-MAIL US AT OUR WEB SITE (WWW.AMERICANCENTURY.COM).

[right margin]

ACCESSING YOUR MONEY. . .
WE CAN SEND A CHECK  DIRECTLY TO YOU AT YOUR ADDRESS OF RECORD.  ALL YOU NEED TO
DO IS GIVE US A CALL OR WRITE US A LETTER REQUESTING THE CHECK. WE CAN ALSO MAKE
AUTOMATIC DEPOSITS FROM YOUR MONEY MARKET FUND TO YOUR BANK ACCOUNT.

* Requires shareholder authorization.


                                                  www.americancentury.com      3


Florida Muni. Money Mkt.--Performance
- --------------------------------------------------------------------------------
TOTAL RETURNS AS OF NOVEMBER 30, 1998

<TABLE>
                                        INCEPTION 4/11/94
                  FLORIDA MUNICIPAL   OTHER STATES TAX-EXEMPT MONEY MARKET FUNDS(2)
                     MONEY MARKET        AVERAGE RETURN       FUND'S RANKING
- --------------------------------------------------------------------------------
<S>                 <C>             <C>                  <C>                      
6 MONTHS(1) .......     1.52%                1.47%                  --
1 YEAR ............     3.17%                3.06%             13 OUT OF 33
- --------------------------------------------------------------------------------
AVERAGE ANNUAL RETURNS
3 YEARS(3) ........     3.42%                3.14%              4 OUT OF 30
LIFE OF FUND(3) ...     3.53%                3.20%(4)           1 OUT OF 17(4)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Returns and rankings  would have been lower if management  fees had not been
    waived from 4/11/94 to 12/31/96.

(4) Since 4/30/94,  the date nearest the fund's  inception for which return data
    are available.

See pages 16-17 for more information about returns and Lipper fund rankings.

PORTFOLIO AT A GLANCE
                          11/30/98           5/31/98
NUMBER OF SECURITIES         43                45
WEIGHTED AVERAGE
  MATURITY                 33 DAYS           54 DAYS
EXPENSE RATIO              0.50%(1)          0.51%(2)

(1)  Annualized.

(2)  On August  1,  1997,  a new  management  agreement  with  American  Century
     Investment  Management,  Inc.  went  into  effect.  The  agreement  reduced
     management fees to approximately 0.50%.

YIELDS AS OF NOVEMBER 30, 1998

  7-DAY CURRENT YIELD
                                2.95%
  7-DAY EFFECTIVE YIELD
                                2.99%
  7-DAY TAX-EQUIVALENT YIELDS
    28.0% TAX BRACKET           4.10%
    31.0% TAX BRACKET           4.28%
    36.0% TAX BRACKET           4.61%
    39.6% TAX BRACKET           4.88%

Past performance does not guarantee future results.

Money market funds are neither  insured nor  guaranteed by the FDIC or any other
government agency.

Yields will fluctuate, and although the fund seeks to preserve the value of your
investment  at $1 per share,  it is possible to lose money by  investing  in the
fund. The 7-day yield more closely reflects  earnings of the fund than the total
return.


4      1-800-345-2021


Florida Municipal Money Market--Q&A
- --------------------------------------------------------------------------------
/photo of Bryan Karcher/

     An  interview  with Bryan  Karcher,  a  portfolio  manager  on the  Florida
Municipal Money Market investment team.

HOW DID FLORIDA  MUNICIPAL  MONEY  MARKET  PERFORM  DURING THE SIX MONTHS  ENDED
NOVEMBER 30, 1998?

     Florida  Municipal  Money  Market  continued  to provide a higher  level of
federal tax-exempt income than the average state-specific  tax-free money market
fund. The fund's total return was 1.52%,  compared with the 1.47% average return
of the 34 "Other States  Tax-Exempt  Money Market Funds"  tracked by Lipper Inc.
(formerly Lipper Analytical Services).  In addition,  the fund's 12-month return
was 3.17%,  compared with 3.06% for the Lipper  average.  (See the Total Returns
table on the previous page for other fund performance comparisons.)

WHY DID FLORIDA  MUNICIPAL  MONEY  MARKET BEAT THE AVERAGE  RETURN OF ITS LIPPER
PEER GROUP?

     One reason is low  management  fees--just 50 basis points  (0.50%--a  basis
point equals 0.01%).  Lower management  expenses  directly benefit  shareholders
because we're  delivering  returns at a reduced cost.  Other things being equal,
lower expenses mean higher returns and yields for our shareholders.

     We also  work  hard to  maximize  the  fund's  yield.  We do this by adding
securities at times of the year when yields are relatively  high due to seasonal
supply and demand  factors,  and by structuring the maturity of the portfolio so
we avoid  replacing  maturing  securities  when  yields are  relatively  low. In
addition,  we closely monitor several  different types of municipal money market
paper,  including  variable-rate  demand notes (VRDNs), put bonds, and municipal
notes of different maturities.  We typically buy what offers the most attractive
yield as a result of supply and demand factors.

RELATIVE PERFORMANCE WAS STRONG, BUT FLORIDA MUNICIPAL MONEY MARKET'S YIELD
DECLINED. WHY?

     The current yield declined from 3.26% on May 31 to 2.95% on November 30 due
primarily to an overall decline in interest  rates.  Interest rates tend to fall
when the economy  weakens--lower  interest rates help stimulate growth.  When it
appeared the U.S.  economy was heading for recession as a result of economic and
financial  turmoil  overseas,  the Federal  Reserve (the Fed), the U.S.  central
bank,  cut  short-term  interest  rates three times  between late  September and
mid-November.  The yields on money market securities declined in anticipation of
the Fed's actions.

HOW DID THE FED'S ACTIONS INFLUENCE YOUR MANAGEMENT OF THE FUND?

     The Fed's rate cuts caused us to extend  Florida  Municipal  Money Market's
weighted average maturity (WAM) in September.  When the Fed starts cutting rates
and more cuts are  anticipated,  we want to lock in the highest  possible yields
for the longest period of time. To accomplish this, we

[right margin]

"FLORIDA MUNICIPAL MONEY MARKET CONTINUED TO PROVIDE A HIGHER LEVEL OF
TAX-EXEMPT INCOME THAN THE AVERAGE STATE-SPECIFIC TAX-FREE MONEY MARKET FUND."

[pie charts - data below]

PORTFOLIO COMPOSITION BY SECURITY TYPE

AS OF NOVEMBER 30, 1998
VRDNs               81%
Put Bonds            9%
Bonds
 less than 1 Year    7%
Commercial Paper     3%

AS OF MAY 31, 1998
VRDNs               70%
Other                3%
Bonds 
 less than 1 Year   24%
Commercial Paper     3%

Security types are defined on page 17.


                                                  www.americancentury.com      5


Florida Municipal Money Market--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

typically buy longer-term securities. Fortunately, longer-term muni money market
securities were priced  attractively in September,  due in part to corporate tax
payments on September 15, which increased supply and reduced demand.

     We  determine  the  relative  value of  one-year  munis by looking at their
yields in relation to Treasury yields. During September, one-year muni yields as
a  percentage  of one-year  Treasury  yields  climbed  from about 67% to 75%. We
consider  anything  above 70%  attractive.  With  one-year muni yields at such a
relatively  high level,  we bought one-year munis and extended the fund's WAM in
October.

FLORIDA  MUNICIPAL  MONEY MARKET'S WAM FELL FROM 54 DAYS ON MAY 31 TO 33 DAYS ON
NOVEMBER 30 EVEN THOUGH YOU EXTENDED THE WAM DURING SEPTEMBER. WHY?

     Focusing on the WAM's decline during that period is a little misleading. We
often  increase our holdings of  longer-term  securities in April and May, which
significantly  boosts the WAM on May 31. Late spring is when one-year  munis are
competitively  priced--shareholders are withdrawing money from muni money market
funds to pay their income taxes,  which  reduces  demand (and prices) and boosts
supply (and yields).

     After tax season, we didn't make significant additional long-term purchases
until early fall. If we don't purchase notes for a while, the portfolio's  notes
steadily decline in maturity ("roll down"), and the WAM declines.

WHAT  STEPS  HAVE YOU TAKEN TO KEEP  FLORIDA  MUNICIPAL  MONEY  MARKET'S  CREDIT
QUALITY HIGH?

     We continue to be very conservative, more so than the SEC requires in terms
of the credit  quality of the fund's  holdings.  We are very careful to purchase
securities that are backed by strong  financial  institutions.  As a result,  we
haven't owned Japanese bank-backed paper since February 1998.  Furthermore,  our
credit analysis team is now carefully  evaluating  European banks, many of which
may not be prepared for the year 2000 computer problem.

WHAT IS YOUR OUTLOOK FOR SHORT-TERM INTEREST RATES AND FUND STRATEGY?

     The U.S. economy remains  vulnerable to financial  events overseas,  but it
also was bolstered by the Fed's  interest  rate cuts.  Consumer  confidence  and
spending  remain  strong,  but they're being offset by weakness in the corporate
and manufacturing sectors. The Fed may need time to evaluate these mixed signals
and the results of its rate cuts in 1998. Therefore, we expect the Fed to take a
"wait-and-see"  approach to interest rate policy,  with no  additional  interest
rate cuts for a while.  This argues for greater interest rate stability in early
1999, barring any cataclysmic events.

     We'll continue to emphasize  conservative  credit  standards.  In addition,
we'll attempt to maintain a competitive yield by monitoring supply and demand in
the  marketplace and the yield  relationships  between VRDNs,  six-month  munis,
one-year munis, and comparable-maturity Treasurys.

[left margin]

"WE ARE VERY CAREFUL TO PURCHASE SECURITIES THAT ARE BACKED BY STRONG FINANCIAL
INSTITUTIONS."

PORTFOLIO COMPOSITION BY CREDIT RATING
              % OF FUND INVESTMENTS
             AS OF             AS OF
           11/30/98           5/31/98
SP1+          88%               90%
SP1           12%               10%

SP1+ and SP1 are  Standard  &  Poor's  highest  credit  ratings  for  short-term
municipal  securities.  See  Credit  Rating  Guidelines  on  page  16  for  more
information.


6      1-800-345-2021


Florida Muni. Money Market--Sch. of Investments
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
SHORT-TERM MUNICIPAL SECURITIES
               $  500,000  Broward County Housing Finance
                              Auth. Multifamily Housing Rev.,
                              Series 1990 A,
                              (Palm Aire-Oxford), VRDN,
                              3.25%, 12/2/98 (Guaranteed:
                              Continental Casualty Co.)             $  500,000
                2,270,000  Broward County Industrial
                              Development Rev., (Fast Real
                              Estate Partners), VRDN, 3.30%,
                              12/2/98 (LOC: Suntrust Bank
                              South Florida, N.A.)                   2,270,000
                2,500,000  Broward County Industrial
                              Development Rev., (HEICO
                              Aerospace Corp.), VRDN,
                              3.30%, 12/2/98 (LOC:
                              Suntrust Bank South Florida,
                              N.A.)                                  2,500,000
                2,230,000  Broward County Industrial
                              Development Rev., (MDR
                              Fitness Corp.), VRDN, 3.30%,
                              12/2/98 (LOC: Suntrust Bank,
                              Miami, N.A.)                           2,230,000
                1,800,000  Broward County Industrial
                              Development Rev., (W.R. Bonsal
                              Co.), VRDN, 3.35%, 12/3/98
                              (LOC: NationsBank, N.A.)
                              (Acquired 3/18/98, Cost
                              $1,800,000)(1)                         1,800,000
                3,460,000  Coral Springs Industrial
                              Development Rev., (Royal
                              Plastics Group), VRDN, 3.30%,
                              12/2/98 (LOC: Suntrust Bank
                              South Florida, N.A.)                   3,460,000
                2,500,000  Dade County Aviation Rev., Series
                              1997 A, (Miami International
                              Airport), 4.60%, 10/1/99
                              (FSA)                                  2,529,886
                1,000,000  Dade County Industrial
                              Development Auth. Rev., Series
                              1989 B, (Stephen M. Green),
                              VRDN, 3.25%, 12/2/98 (LOC:
                              Suntrust Bank, Miami, N.A.)            1,000,000
                4,000,000  Dade County Special Obligation
                              Trust Receipts, Series 1998 C-2,
                              VRDN, 3.65%, 12/2/98 (LOC:
                              Bank of America N.T. & S.A.)
                              (Acquired 11/24/98, Cost
                              $4,000,000)(1)                         4,000,000
                7,320,000  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., VRDN, 3.35%,
                              12/3/98 (Liquidity: Merrill
                              Lynch & Co., Inc.) (Acquired
                              4/9/98-5/20/98, Cost
                              $7,320,000)(1)                         7,320,000

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
               $1,710,000  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., VRDN, 3.35%,
                              12/3/98 (SBBPA: Merrill
                              Lynch & Co., Inc.) (Acquired
                              12/3/96, Cost $1,710,000)(1)         $ 1,710,000
                4,000,000  Florida Housing Finance Agency
                              Rev., Series 1990 B,
                              (Beville-Oxford), VRDN, 3.25%,
                              12/2/98 (SBBPA: Continental
                              Casualty Co.)                          4,000,000
                3,300,000  Florida Housing Finance Agency 
                              Rev., (Country
                              Club), VRDN, 3.20%, 12/1/98 (LOC:
                              Northern Trust Company)                3,300,000
                4,650,000  Florida Housing Finance Agency
                              Rev., Series 1989 J, (Ashley
                              Lake II), VRDN, 3.25%,
                              12/2/98 (LOC: Morgan
                              Guaranty Trust Co. of New York)        4,650,000
                4,500,000  Florida Housing Finance Agency
                              Rev., Series 1996 F, (Caribbean
                              Key), VRDN, 3.25%, 12/2/98
                              (LOC: KeyBank, N.A.)                   4,500,000
                2,000,000  Florida Housing Finance Agency
                              Rev., Series 1996 P, (Tiffany
                              Club), VRDN, 3.25%, 12/2/98
                              (LOC: NationsBank, N.A.)               2,000,000
                2,500,000  Florida Housing Finance Agency
                              Rev., Series 1996 U, (Heron
                              Park), VRDN, 3.25%, 12/2/98
                              (LOC: NationsBank, N.A.)               2,500,000
                4,345,000  Florida Housing Finance Agency
                              Trust Receipts, VRDN, 3.55%,
                              12/2/98 (MBIA) (SBBPA:
                              Bank of New York) (Acquired
                              2/12/98, Cost $4,345,000)(1)           4,345,000
                4,000,000  Florida Housing Finance Corp.
                              Rev.,  Series  1998 E, 
                              (Club at Vero  Apartments),
                              VRDN, 3.25%, 12/2/98 (LOC:
                              NationsBank, N.A.)                     4,000,000
                3,000,000  Florida Housing Finance Corp.
                              Rev., Series 1998-6,
                              (Homeowner Mortgage),
                              3.80%, 6/15/99 (GIC: FGIC
                              Capital Markets)                       3,000,000
                  500,000  Florida State Division Board of
                              Finance Department General
                              Services Rev., Series 1991 A,
                              (Preservation 2000), 6.20%,
                              7/1/99 (AMBAC)                           508,438
                1,740,000  Florida State GO, (Department of
                              Transportation), 6.875%,
                              7/1/99                                 1,776,608
                  500,000  Florida State GO, Series 1997 B,
                              (Department of Transportation),
                              5.00%, 7/1/99                            504,853

See Notes to Financial Statements


                                                  www.americancentury.com      7


Florida Municipal Money Market--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
               $1,815,000  Gulf Breeze Rev., Series 1985 B, 
                              (Local Government
                              Loan Program), VRDN, 3.10%, 
                              12/3/98 (FGIC) (SBBPA:
                              Credit Locale de France)             $ 1,815,000
                2,000,000  Indian River County Hospital
                              District Rev., (Sunhealth
                              Network), Commercial Paper,
                              3.25%, 2/12/99 (LOC: KBC
                              Bank and Insurance Holding)            2,000,000
                  900,000  Indian River County Industrial
                              Development Rev., (Florida
                              Convention Centers), VRDN,
                              3.55%, 12/1/98 (LOC:
                              Toronto-Dominion Bank)                   900,000
                1,000,000  Lake County Sales Tax Rev.,
                              5.125%, 12/1/98 (FGIC)                   999,999
                1,000,000  Marion County Housing Finance
                              Auth. Multifamily Rev., Series
                              1985 F, (Paddock Place),
                              VRDN, 3.15%, 12/3/98 (LOC:
                              Suntrust Bank, Atlanta, GA)            1,000,000
                  780,000  Martin County Industrial
                              Development Auth. Rev.,
                              (Florida R.F. Labs Inc.), VRDN,
                              3.30%, 12/2/98 (LOC:
                              Suntrust Bank Central Florida,
                              N.A.)                                    780,000
                  300,000  Martin County Industrial
                              Development Auth. Rev., (Tampa
                              Farm Service Inc.), VRDN,
                              3.30%, 12/2/98 (LOC:
                              Suntrust Bank Central Florida,
                              N.A.) (Acquired 6/13/96,
                              Cost $300,000)(1)                        300,000
                1,000,000  Martin County Pollution Control
                              Rev., (Florida Power & Light
                              Co.), VRDN, 3.35%, 12/1/98             1,000,000
                1,800,000  Miami-Dade County Industrial
                              Development Auth. Rev.,
                              (Dutton Press Inc.), VRDN,
                              3.30%, 12/2/98 (LOC:
                              Suntrust Bank, Miami, N.A.)
                              (Acquired 2/27/98, Cost
                              $1,800,000)(1)                         1,800,000
                  200,000  Ocean Highway & Port Auth. Rev.,
                              VRDN, 3.15%, 12/2/98 (LOC:
                              ABN Amro Bank N.V.)                      200,000
                1,700,000  Ocean Highway & Port Auth. Rev.,
                              VRDN, 3.15%, 12/2/98 (LOC:
                              ABN Amro Bank N.V.)                    1,700,000

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
               $1,000,000  Orange County Health Facilities
                              Auth. Rev., (Adventist Health
                              Systems/Sunbelt), VRDN,
                              3.15%, 12/3/98 (LOC:
                              Rabobank Nederland)                  $ 1,000,000
                2,500,000  Orange County Health Facilities
                              Auth. Rev., (Presbyterian
                              Retirement), VRDN, 3.25%,
                              12/3/98 (LOC: NationsBank,
                              N.A.) (Acquired 11/19/98,
                              Cost $2,500,000)(1)                    2,500,000
                1,150,000  Orange County Housing Finance
                              Auth. Multifamily Guaranteed
                              Mortgage Rev., Series 1989 A,
                              (Sundown Association II), VRDN,
                              3.50%, 12/2/98 (LOC: Fleet
                              Bank, N.A.)                            1,150,000
                2,200,000  Pinellas County Industrial Council
                              Development Rev., (Better 
                              Business Forms Inc.),
                              VRDN, 3.30%, 12/2/98 (LOC:
                              Suntrust Bank, Tampa Bay)              2,200,000
                2,100,000  Pinellas County Industrial Council
                              Development Rev., (Hunter
                              Douglas Inc.), VRDN, 3.30%,
                              12/2/98 (LOC: ABN Amro
                              Bank N.V.) (Acquired 3/17/97,
                              Cost $2,100,000)(1)                    2,100,000
                3,300,000  Pinnellas County Housing Finance
                              Auth. Single Family Rev., Series
                              1998, 3.70%, 2/1/99                    3,300,000
                1,910,000  Putnam County Development Auth.
                              Pollution Control Rev., (Seminole
                              Electric), 3.30%, 3/15/99
                              (SBBPA: National Rural Utilities
                              Cooperative Finance Corp.)             1,910,000
                1,100,000  Volusia County Housing Finance
                              Auth. Multifamily Rev., Series
                              1985 H, (Sun Pointe
                              Apartments), VRDN, 3.10%,
                              12/1/98 (LOC: KeyBank, N.A.)           1,100,000
                1,670,000  Volusia County Industrial
                              Development Auth. Rev.,
                              (Daytona Plastix Inc.), VRDN,
                              3.30%, 12/2/98 (LOC:
                              Suntrust Bank Central Florida,
                              N.A.) (Acquired 7/17/96-
                              12/19/97, Cost $1,670,000)(1)          1,670,000
                                                                  -------------
TOTAL INVESTMENT SECURITIES--100.0%                                $93,829,784
                                                                  =============

                                              See Notes to Financial Statements


8      1-800-345-2021


Florida Muni. Money Market--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)

NOVEMBER 30, 1998 (UNAUDITED)

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

FGIC = Financial Guaranty Insurance Co.

FSA = Financial Security Assurance Inc.

GIC = Guaranteed Investment Contract

GO = General Obligation

LOC = Letter of Credit

MBIA = MBIA Insurance Corp.

SBBPA = Standby Bond Purchase Agreement

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
   calculating the weighted average portfolio maturity.  Rate shown is effective
   November 30, 1998.

(1)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement,  and unless registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate  value  of  restricted   securities  at  November  30,  1998  was
     $27,545,000,   which  represented  29.2%  of  net  assets.  None  of  these
     securities are considered to be illiquid.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the percent and dollar breakdown of each investment category

See Notes to Financial Statements


                                                  www.americancentury.com      9


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

ASSETS
Investment securities, at value
  (amortized cost and cost for
  federal income tax purposes)
  (Note 1) ................................................          $93,829,784
Cash ......................................................            1,886,221
Interest receivable .......................................              511,342
                                                                     -----------
                                                                      96,227,347
                                                                     -----------
LIABILITIES
Disbursements in excess of
  demand deposit cash .....................................                7,873
Payable for investments purchased .........................            1,815,000
Payable for capital shares redeemed .......................               11,677
Dividends payable .........................................                1,491
Accrued management fees (Note 2) ..........................               38,157
Accrued trustees' fees and expenses .......................                  354
                                                                     -----------
                                                                       1,874,552
                                                                     -----------
Net Assets ................................................          $94,352,795
                                                                     ===========
CAPITAL SHARES
Outstanding (unlimited number
  of shares authorized) ...................................           94,352,795
                                                                     ===========
Net Asset Value Per Share .................................          $      1.00
                                                                     ===========
NET ASSETS CONSIST OF:
Capital paid in ...........................................          $94,352,795
                                                                     ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of shares  outstanding  gives you the price of an individual  share,  or the net
asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); and
net gains earned on investment  activity but not yet paid to shareholders or net
losses on investment  activity (known as realized gains or losses), if any. This
breakdown tells you the value of net assets that are  performance-related,  such
as investment gains or losses,  and the value of net assets that are not related
to performance, such as shareholder investments and redemptions.

                                              See Notes to Financial Statements


10      1-800-345-2021


Statement of Operations
- --------------------------------------------------------------------------------

FOR THE SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED)

INVESTMENT INCOME
Income:
Interest ................................................             $1,757,915
                                                                      ----------
Expenses (Note 2):
Management fees .........................................                246,778
Trustees' fees and expenses .............................                  2,740
                                                                      ----------
                                                                         249,518
                                                                      ----------
Net investment income ...................................             $1,508,397
                                                                      ==========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

See Notes to Financial Statements


                                                 www.americancentury.com      11


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED)  AND YEAR ENDED MAY 31, 1998

                                                NOVEMBER 30,          MAY 31,
Decrease in Net Assets                              1998               1998

OPERATIONS
Net investment income ..................      $   1,508,397       $   3,755,691
                                              -------------       -------------

DISTRIBUTIONS TO
SHAREHOLDERS
From net investment income .............         (1,508,397)         (3,755,691)
                                              -------------       -------------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ..............         30,076,631         282,351,887
Proceeds from reinvestment
  of distributions .....................          1,289,231           3,240,863
Payments for shares redeemed ...........        (46,697,388)       (288,037,630)
                                              -------------       -------------
Net decrease in net assets from
  capital share transactions ...........        (15,331,526)         (2,444,880)
                                              -------------       -------------
Net decrease in net assets .............        (15,331,526)         (2,444,880)

NET ASSETS
Beginning of period ....................        109,684,321         112,129,201
                                              -------------       -------------
End of period ..........................      $  94,352,795       $ 109,684,321
                                              =============       =============

TRANSACTIONS IN
SHARES OF THE FUND
Sold ...................................         30,076,631         282,351,887
Issued in reinvestment
  of distributions .....................          1,289,231           3,240,863
Redeemed ...............................        (46,697,388)       (288,037,630)
                                              -------------       -------------
Net decrease ...........................        (15,331,526)         (2,444,880)
                                              =============       =============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
  redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital share  transactions  results in net
assets at the end of the period.

                                              See Notes to Financial Statements


12      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     ORGANIZATION--American  Century  Municipal  Trust (the Trust) is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company.  American  Century - Benham  Florida  Municipal  Money Market Fund (the
Fund) is one of the eight Funds issued by the Trust. The Fund is non-diversified
under  the 1940  Act.  Its  investment  objective  is to seek as high a level of
current  income exempt from federal  income taxes as is consistent  with prudent
investment  management and  conservation of  shareholders'  capital by investing
primarily  in  short-term  municipal  obligations.  The  Fund  concentrates  its
investments  in a single state and  therefore  may have more  exposure to credit
risk  related  to the state of Florida  than a fund with a broader  geographical
diversification. The following significant accounting policies are in accordance
with generally accepted accounting principles.

     SECURITY  VALUATIONS--Portfolio  securities  held by the Fund are valued at
amortized cost, which approximates current market value. When valuations are not
readily  available,  securities  are  valued  at fair  value  as  determined  in
accordance with procedures adopted by the Board of Trustees.

     SECURITY  TRANSACTIONS--Security  transactions  are accounted for as of the
trade date. Net realized gains and losses are determined on the identified  cost
basis, which is also used for federal income tax purposes.

     INVESTMENT  INCOME--Interest  income is recorded  on the accrual  basis and
includes accretion of discounts and amortization of premiums.

     INCOME TAX STATUS--It is the Fund's policy to distribute all net investment
income and net realized capital gains to shareholders  and to otherwise  qualify
as a regulated  investment  company under the provisions of the Internal Revenue
Code. Accordingly, no provision has been made for federal or state income taxes

     DISTRIBUTIONS TO SHAREHOLDERS--Distributions from net investment income are
declared and credited daily and distributed monthly. The Fund does not expect to
realize any long-term capital gains, and accordingly, does not expect to pay any
capital gain distributions.

     ADDITIONAL  INFORMATION--Funds  Distributor,  Inc.  (FDI)  is  the  Trust's
distributor. Certain officers of FDI are also officers of the Trust.


                                                 www.americancentury.com      13


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

     The Trust has entered into a Management  Agreement  with  American  Century
Investment  Management,  Inc.  (ACIM) that  provides  each Fund with  investment
advisory and management  services in exchange for a single,  unified  management
fee.  Expenses  excluded  from the  agreement are  brokerage,  taxes,  portfolio
insurance, interest, fees and expenses of those Trustees' who are not considered
"interested persons" as defined in the Investment Company Act of 1940 (including
counsel fees) and extraordinary  expenses.  The annual rate at which this fee is
assessed is determined monthly in a two-step process: First, a fee rate schedule
is  applied  to the net  assets  of all of the  funds in the  Fund's  investment
category which are managed by ACIM (the "Investment  Category Fee"). The overall
investment objective of each Fund determines its Investment Category.  The three
investment  categories  are:  the  Money  Market  Fund  Category,  the Bond Fund
Category, and the Equity Fund Category. The Fund is included in the Money Market
Fund Category. Second, a separate fee rate schedule is applied to the net assets
of all of the funds managed by ACIM (the "Complex Fee"). The Investment Category
Fee and the Complex Fee are then added to determine the unified  management  fee
rate.  The  management  fee is paid  monthly by the Fund based on its  aggregate
average  daily net assets  during the previous  month  multiplied by the monthly
management fee rate.


     The annualized Investment Category Fee schedule is as follows:

     0.2700% of the first $1 billion 
     0.2270% of the next $1 billion 
     0.1860% of the next $3 billion 
     0.1690% of the next $5 billion 
     0.1580% of the next $15 billion 
     0.1575% of the next $25 billion
     0.1570% of the average daily net assets over $50 billion

     The annualized Complex Fee schedule is as follows:

     0.3100% of the first $2.5 billion 
     0.3000% of the next $7.5 billion 
     0.2985% of the next $15 billion 
     0.2970% of the next $25 billion 
     0.2960% of the next $50 billion 
     0.2950% of the next $100 billion 
     0.2940% of the next $100 billion 
     0.2930% of the next $200 billion 
     0.2920% of the next $250 billion
     0.2910% of the next $500 billion
     0.2900% of the average daily net assets over $1,250 billion

     Certain  officers  and  trustees  of the  Trust  are also  officers  and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the Trust's  investment  manager,  ACIM, and the
Trust's transfer agent, American Century Services Corporation.


14      1-800-345-2021


Florida Muni. Money Mkt.--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
    FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31 (EXCEPT AS NOTED)

                                     1998(1)           1998            1997           1996            1995          1994(2)
PER-SHARE DATA
Net Asset Value,
<S>                              <C>               <C>             <C>             <C>            <C>            <C>        
Beginning of Period ..........   $      1.00       $      1.00     $      1.00     $      1.00    $      1.00    $      1.00
                                 -----------       -----------     -----------     -----------    -----------    -----------
Income From Investment
Operations
  Net Investment Income ......          0.02              0.03            0.03            0.04           0.04           --
                                 -----------       -----------     -----------     -----------    -----------    -----------
Distributions
  From Net Investment Income .         (0.02)            (0.03)          (0.03)          (0.04)         (0.04)          --
                                 -----------       -----------     -----------     -----------    -----------    -----------
Net Asset Value, End of Period   $      1.00       $      1.00     $      1.00     $      1.00    $      1.00    $      1.00
                                 ===========       ===========     ===========     ===========    ===========    ===========
  Total Return(3) ............          1.52%             3.31%           3.55%           3.86%          3.71%          0.40%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
  to Average Net Assets ......          0.50%(4)          0.51%           0.12%           0.01%          --             --
Ratio of Operating Expenses
  to Average Net Assets
  (Before Expense Waiver) ....          0.50%(4)          0.53%           0.66%           0.71%          0.88%          1.58%(4)
Ratio of Net Investment
  Income to Average Net Assets          3.02%(4)          3.25%           3.48%           3.75%          3.93%          2.99%(4)
Ratio of Net Investment Income
  to Average Net Assets
  (Before Expense Waiver) ....          3.02%(4)          3.23%           2.94%           3.05%          3.05%          1.41%(4)
Net Assets, End of Period
(in thousands) ...............   $    94,353       $   109,684     $   112,129     $    99,993    $    45,147    $     5,565
</TABLE>

(1) Six months ended November 30, 1998 (unaudited).

(2) April 11, 1994 (inception) through May 31, 1994.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  statement itemizes current period
activity and  statistics and provides  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming
  reinvestment of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

See Notes to Financial Statements


                                                 www.americancentury.com      15


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     The Benham Group offers 38  fixed-income  funds,  ranging from money market
funds to long-term bond funds and including  both taxable and tax-exempt  funds.
Each fund is  managed  to  provide  a "pure  play" on a  specific  sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's portfolio is tied to a specific  benchmark  index.  Fund managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

     In addition to these principles, each fund has its own investment policies

     FLORIDA  MUNICIPAL MONEY MARKET seeks interest income exempt from state and
federal  income  taxes,  as well as the Florida  intangibles  tax, by  investing
primarily in high-quality, short-term Florida municipal securities.

     Investments  in Florida  Municipal  Money  Market are  neither  insured nor
guaranteed by the FDIC or any other  government  agency.  Yields will fluctuate,
and although the fund seeks to preserve the value of your  investment  at $1 per
share, it is possible to lose money by investing in the fund.

LIPPER RANKINGS

     LIPPER INC. is an independent mutual fund ranking service. Rankings are
based on average annual returns for each fund in a given category for the
periods indicated. Rankings are not included for periods less than one year.

     The Lipper category for the Florida Municipal Money Market fund is:

     OTHER  STATES   TAX-EXEMPT  MONEY  MARKET   FUNDS--funds   that  invest  in
high-quality  municipal  obligations with dollar-weighted  average maturities of
less than 90 days.

CREDIT RATING GUIDELINES

     Credit  quality (the  issuer's  financial  strength and the  likelihood  of
timely  payment of  interest  and  principal)  is a key  factor in  fixed-income
investment  analysis.  Credit ratings issued by independent  rating and research
companies such as Standard & Poor's help quantify credit  quality--the  stronger
the issuer,  the higher the credit rating.  In turn,  credit quality and ratings
greatly influence the prices and yields of fixed-income securities--high ratings
mean higher prices and less current income (yield) as compensation for risk.

     But credit ratings are subjective.  They reflect the opinions of the rating
agencies that issue them and are not absolute standards of quality. Furthermore,
high credit ratings do not guarantee good  investment  performance.  They do not
reflect the price  stability  of a municipal  security  when  economic or market
conditions change.

INVESTMENT TEAM LEADERS
  PORTFOLIO MANAGER
     BRYAN KARCHER

MUNICIPAL CREDIT RESEARCH TEAM
  MANAGER
     STEVEN PERMUT
  MUNICIPAL CREDIT ANALYSTS
     DAVID MOORE
     ROBERT MILLER
     BILL MCCLINTOCK
     TIM BENHAM
     BRAD BODE


16      1-800-345-2021


Glossary
- --------------------------------------------------------------------------------

RETURNS

* TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on page 15.

YIELDS

* 7-DAY  CURRENT  YIELD  is  calculated  based  on the  income  generated  by an
investment  in the fund over a seven-day  period and is  expressed  as an annual
percentage rate.

* 7-DAY  EFFECTIVE  YIELD is  calculated  similarly,  although  this  figure  is
slightly  higher than the fund's 7-Day  Current  Yield because of the effects of
compounding.  The 7-Day  Effective  Yield  assumes  that income  earned from the
fund's investments is reinvested and generating additional income.

*  TAX-EQUIVALENT  YIELDS show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

INVESTMENT TERMS

* BASIS POINT--a basis point equals one  one-hundredth of a percentage point (or
0.01%). Therefore, 100 basis points equal one percentage point (or 1%).

PORTFOLIO STATISTICS

* NUMBER OF SECURITIES--the  number of different  securities held by a fund on a
given date.

*  WEIGHTED  AVERAGE  MATURITY  (WAM)--a  measurement  of the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio mature, weighted by dollar amount.

* EXPENSE RATIO--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

TYPES OF MUNICIPAL SECURITIES

* MUNICIPAL COMMERCIAL PAPER (CP)--high-grade  short-term securities backed by a
line of credit from a bank.

* MUNICIPAL NOTES--securities with maturities of two years or less.

* PUT  BONDS--long-term  securities  that can be "put back" (i.e.,  sold at face
value) to a specified buyer at a prearranged date.

*  VARIABLE-RATE  DEMAND NOTES  (VRDNS)--securities  that track market  interest
rates and  stabilize  their  market  values  using  periodic  (daily or  weekly)
interest rate adjustments.


                                                 www.americancentury.com      17


Notes
- --------------------------------------------------------------------------------


18      1-800-345-2021


Notes
- --------------------------------------------------------------------------------


                                                 www.americancentury.com      19


Notes
- --------------------------------------------------------------------------------


20      1-800-345-2021


[inside back cover]

AMERICAN CENTURY FUNDS
- -------------------------------------------------------------------------------

BENHAM GROUP(reg.sm)
TAXABLE BOND FUNDS
U.S. TREASURY & GOVERNMENT
   Short-Term Treasury
   Short-Term Government
   GNMA
   Intermediate-Term Treasury
   Long-Term Treasury
   Inflation-Adjusted Treasury
   Target Maturities Trust: 2000
   Target Maturities Trust: 2005
   Target Maturities Trust: 2010
   Target Maturities Trust: 2015
   Target Maturities Trust: 2020
   Target Maturities Trust: 2025
CORPORATE & DIVERSIFIED
   Limited-Term Bond
   Intermediate-Term Bond
   Bond
   Premium Bond
   High-Yield Bond
INTERNATIONAL
   International Bond

TAX-FREE & MUNICIPAL BOND FUNDS
MULTIPLE-STATE
   Limited-Term Tax-Free
   Intermediate-Term Tax-Free
   Long-Term Tax-Free
   High-Yield Municipal
SINGLE-STATE
   Arizona Intermediate-Term Municipal
   California High-Yield Municipal
   California Insured Tax-Free
   California Intermediate-Term Tax-Free
   California Limited-Term Tax-Free
   California Long-Term Tax-Free
   Florida Intermediate-Term Municipal

MONEY MARKET FUNDS
TAXABLE
   Capital Preservation
   Government Agency Money Market
   Premium Capital Reserve
   Premium Government Reserve
   Prime Money Market
TAX-FREE & MUNICIPAL
   California Municipal Money Market
   California Tax-Free Money Market
   Florida Municipal Money Market
   Tax-Free Money Market

AMERICAN CENTURY(reg.sm) GROUP
ASSET ALLOCATION
   Strategic Allocation: Conservative
   Strategic Allocation: Moderate
   Strategic Allocation: Aggressive
BALANCED
   Balanced
CONSERVATIVE EQUITY
   Income and Growth
   Equity Income
   Value
   Equity Growth
SPECIALTY
   Utilities
   Real Estate
   Global Natural Resources
   Global Gold
SMALL CAP
   Small Cap Quantitative
   Small Cap Value

TWENTIETH CENTURY GROUP
GROWTH
   Select
   Heritage Growth
   Ultra
AGGRESSIVE GROWTH
   Vista
   Giftrust
   New Opportunities
INTERNATIONAL GROWTH
   International Growth
   International Discovery
   Emerging Markets
GLOBAL
   Global Growth

Please call for a prospectus  or profile on any  American  Century  fund.  These
documents contain important information including charges and expenses,  and you
should read them carefully before you invest or send money.


[right margin]

[american century logo(reg.sm)]
American
Century

P.O. BOX 419200
KANSAS CITY, MISSOURI
64141-6200

INVESTOR SERVICES:
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE:
1-800-345-8765

TELECOMMUNICATIONS DEVICE FOR THE DEAF:
1-800-634-4113 OR 816-444-3485

FAX: 816-340-7962

INTERNET: WWW.AMERICANCENTURY.COM


AMERICAN CENTURY MUNICIPAL TRUST


INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI


THIS REPORT AND THE STATEMENTS IT CONTAINS  ARE SUBMITTED FOR THE GENERAL
INFORMATION  OF OUR SHAREHOLDERS. THE REPORT IS NOT  AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED  BY AN EFFECTIVE
PROSPECTUS.

FUNDS DISTRIBUTOR, INC.
(c) 1998 AMERICAN CENTURY SERVICES CORPORATION


[recycled logo]
Recycled


[back cover]


American Century Investments                                     BULK RATE
P.O. Box 419200                                              U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                   AMERICAN CENTURY
www.americancentury.com                                          COMPANIES



9901                                                    Funds Distributor, Inc.
SH-BKT-15063                      (c)1998 American Century Services Corporation
<PAGE>

[front cover]                                                 NOVEMBER 30, 1998

SEMIANNUAL REPORT
- ----------------
AMERICAN CENTURY

                              [graphic of stairs]

BENHAM GROUP
- ------------------------------------
FLORIDA INTERMEDIATE-TERM MUNICIPAL

                                                 [american century logo(reg.sm)]
                                                                        American
                                                                         Century

[inside front cover]


AMERICAN CENTURY BROKERAGE
- --------------------------------------------------------------------------------

     We're pleased to introduce American Century's new brokerage service,  which
offers a wide range of investment options and features:

     *  FundChoice  Service--Invest  in over 8,000 no-load and load mutual funds
        from hundreds of different fund companies, many with no transaction fees

     *  Buy individual stocks and bonds

     *  24-hour  Internet and  automated  phone trades are just $24.95 for up to
        1,000 shares of stock, and 2 cents per share thereafter

     *  Strong research capability 

        *   Build and track model portfolios

        *   Get news, quotes and charts

        *   Check free Standard & Poor's stock reports

        *   Access Wall Street on Demand(tm),  a research service with more than
            500,000 reports on industry trends,  corporate earnings,  and mutual
            fund analysis

     *  Track your brokerage account on one easy-to-read statement

     *  Unlimited  check writing and a Gold  MasterCard(reg.tm)  ATM/debit  card
        with an American Century Brokerage Access AccountSM (minimum $10,000)

To talk with a Brokerage Associate, call 1-888-345-2071.

WHAT'S NEW . . .

    AMERICAN  CENTURY CATALOG OF TOOLS & SERVICES lists all the free educational
materials available to investors.

    We now have FOUR-PAGE  PROFILES of many of our funds.  The profiles follow a
standard SEC format and are intended to allow investors to compare funds easily.
You can request a profile or the full prospectus. Full prospectuses contain more
detailed fund information and you will continue to receive one after investing.

    In 1999, we will provide  SIMPLIFIED  PROSPECTUSES that highlight  important
information  about our funds,  including  fees and expenses.  More detailed data
will be in the Statement of Additional Information.

    To order any of these materials, please call 1-800-345-2021.

[left margin]

BENHAM GROUP
FLORIDA INTERMEDIATE-TERM MUNICIPAL
(ACBFX)
- ----------------------------------


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     The six months  ended  November  30, 1998,  were  eventful  ones for global
financial markets.  Weakening economic and financial  conditions,  brought on by
problems in Asia,  Russia,  and Latin America,  led to significant  stock market
volatility and a dramatic  decline in interest rates.  Volatility was so rampant
that the U.S. central bank, the Federal Reserve,  cut short-term  interest rates
three times to help stabilize markets worldwide.

     The  third  quarter  of  1998  served  as a good  example  of the  markets'
extremes.  Several major U.S. stock indices hit record highs in mid-July  before
plunging 20% in the following six weeks. In the bond market, high demand for the
safety of Treasury  bonds pushed  yields down to their lowest  levels ever,  but
demand for  corporate  bonds  thinned  to the point  where  trading  was all but
impossible.

     This  type  of  investment  environment  illustrates  the  importance  of a
well-diversified  investment portfolio.  As we saw in the third quarter of 1998,
allocating your assets among stocks, bonds, and money market funds can help your
portfolio weather dramatic changes in the economic or investment climate.

     Municipal bond  performance fit between the extremes  provided by Treasurys
and corporates.  Munis posted positive returns as interest rates fell, but their
performance  was not as strong as that of Treasurys.  Florida  Intermediate-Term
Municipal  continued  to  outperform  its peer  group  and its  benchmark  while
providing more federal tax-free income than the average  municipal debt fund. We
achieved these returns while maintaining our high credit  standards.  Our credit
research  team  closely  monitored  the health of the  Florida  economy  and the
issuers of Florida  municipal  debt,  helping  fund  managers  maintain  Florida
Intermediate-Term Municipal's credit strength and integrity.

     Another situation we've been watching closely is preparation of the world's
computer  systems  for the  year  2000.  At  American  Century,  we're  devoting
substantial  resources to this endeavor.  Throughout  1999, our technology  team
will be  extensively  testing our systems,  including  those  involved with fund
performance and dividend payments.

     Thank you for your continued investment with American Century.

Sincerely,

/s/James E. Stowers, Jr.                 /s/James E. Stowers III
James E. Stowers, Jr.                    James E. Stowers III
Chairman of the Board and Founder        Chief Executive Officer


[right margin]

               Table of Contents
   Report Highlights ..............    2
   Market Perspective .............    3
Florida Intermediate-Term Municipal
   Performance Information ........    4
   Management Q&A .................    5
   Yields .........................    5
   Portfolio at a Glance ..........    5
   Top Five Sectors ...............    6
   Portfolio Composition
   by Credit Rating ...............    7
   Schedule of Investments ........    8
Financial Statements
   Statement of Assets and
   Liabilities ....................   11
   Statement of Operations ........   12
   Statements of Changes
   in Net Assets ..................   13
   Notes to Financial
   Statements .....................   14
   Financial Highlights ...........   16
Other Information
   Background Information
      Investment Philosophy
      and Policies ................   17
      Comparative Indices .........   17
      Lipper Rankings .............   17
      Credit Rating
      Guidelines ..................   17
      Investment Team
      Leaders .....................   17
   Glossary .......................   18


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   A sharp decline in interest rates helped  municipal bonds post solid returns
    for the six months ended November 30, 1998.

*   Rates fell because a series of economic crises around the globe threatened
    to slow the U.S. economy, and because inflation remained low.

*   In an  attempt  to boost  the  economy  and  restore  confidence  to  global
    financial  markets,  the Federal Reserve lowered  short-term  interest rates
    three times between September and November.

*   Despite their gains,  municipal  bonds lagged  Treasury  securities.  That's
    because  the bond  market  rally was  driven by  demand  from  international
    investors, who don't benefit from municipals' tax advantages.

*   Meanwhile,  municipal  bond supply surged as many issuers  sought to lock in
    lower borrowing costs by refinancing older, higher rate bonds.

MANAGEMENT Q&A

*   Florida Intermediate-Term Municipal outperformed its benchmark and its peers
    for the six-month period,  while providing investors with significantly more
    federal tax-free income. (See Total Returns on page 4.)

*   In addition, Lipper Inc. ranked Florida Intermediate-Term Municipal first
    among 15 "Florida Intermediate Municipal Debt Funds" for the twelve months
    ended November 30.

*   Under the guidance of our experienced  research team, we enhanced returns by
    adding undervalued securities to the portfolio.

*   Effective duration  management--controlling  the fund's price sensitivity to
    changes in interest  rates--was  another  important  contributor  to Florida
    Intermediate-Term Municipal's solid performance. We kept duration around 5.6
    years.

*   We think the next six months  will be fairly  upbeat for  Florida  municipal
    investors.

*   Part of this  optimism  is driven by how  attractive  municipal  yields were
    relative to comparable-maturity Treasury yields.

*   Going  forward,  we plan to maintain a slightly long duration  compared with
    the average Florida  intermediate  municipal fund; however, we will reassess
    that position if the economic outlook changes.

[left margin]

"LIPPER INC. RANKED FLORIDA INTERMEDIATE-TERM MUNICIPAL FIRST AMONG 15 'FLORIDA
INTERMEDIATE MUNICIPAL DEBT FUNDS' FOR THE TWELVE MONTHS ENDED NOVEMBER 30."

        FLORIDA INTERMEDIATE-TERM
                MUNICIPAL
                 (ACBFX)
TOTAL RETURNS:             AS OF 11/30/98
    6 Months                       3.95%*
    1 Year                          7.39%
NET ASSETS:                 $34.5 million
30-DAY SEC YIELD:                   3.71%
INCEPTION DATE:                   4/11/94

* Not annualized.

See Total Returns on page 4.
Investment terms are defined in the Glossary on page 18.


2      1-800-345-2021


Market Perspective from Randall W. Merk
- --------------------------------------------------------------------------------
/photo of Randall W. Merk/
Randall W. Merk, director of fixed-income investing at American Century

MODERATE MUNICIPAL RETURNS

     Municipal  securities posted gains during the six months ended November 30,
1998.  Municipal bond prices rose as interest rates declined;  however, too much
supply and too little demand limited returns.  Long-term  municipal bonds, which
are most  sensitive to changes in interest  rates,  performed  best. For the six
months,  the Lehman  Brothers  Long-Term  Municipal Bond Index  returned  4.10%.
Intermediate-term  securities,  as  represented  by the Lehman  Brothers  5-Year
General Obligation Index,  returned 3.43%, while the short-term Merrill Lynch 0-
to 3-Year Municipal Index posted a 2.77% return.

RATES FELL

     Declines  in  interest  rates were  sparked by a series of global  economic
crises that threatened to slow the U.S.  economy.  In addition,  an abundance of
inexpensive imported products and falling commodity prices helped keep inflation
low.  The  government's  consumer  price  index rose just 1.5% for the 12 months
ended November 30, 1998. That's the slowest pace in a dozen years.

     In an attempt to boost the  economy  and restore  confidence  in  financial
markets,  the U.S.  Federal  Reserve cut  short-term  interest rates three times
between September and November, its first rate reductions since January 1996.

MUNICIPALS LAGGED TREASURYS

     Plummeting stock markets,  currency devaluations,  and debt defaults caused
investors  around the world to demand the safety and  liquidity  of U.S Treasury
bonds.  That  surge in demand  led to record  low bond  yields and huge gains by
Treasury securities.  Because international investors don't benefit from the tax
advantages of municipal bonds, demand for municipals lagged.

     Furthermore,  the  supply of  municipals  surged.  Motivated  by  declining
interest  rates,  municipal  issuers sought to lock in lower  borrowing costs by
issuing  new debt  and/or  refinancing  older  debt.  For the six  months  ended
November 30, 1998,  new issue volume was up about a third compared with the same
six-month  period  a year  earlier.  These  supply  and  demand  factors  caused
municipal bonds to underperform Treasury securities for the six months.

STEEPER YIELD CURVE

     Reflecting the Fed's interest rate cuts,  short-term interest rates dropped
dramatically.  For the six months,  the yield on one-year  municipal  securities
fell roughly 62 basis points  (0.62%--a  basis point  equals  0.01%),  while the
yield on 30-year municipal bonds fell only about 15 basis points.  This resulted
in the steeper yield curve shown in the accompanying graph. The yield difference
between a one-year  note and a 30-year bond rose to 176 basis points on November
30, 1998, compared with 128 basis points just six months earlier.

[right margin]

"MUNICIPAL BOND PRICES ROSE AS INTEREST RATES DECLINED; HOWEVER, TOO MUCH SUPPLY
AND TOO LITTLE DEMAND LIMITED RETURNS."

[line chart - data below]

STEEPENING MUNICIPAL YIELD CURVE

Years to Maturity        11/30/98           5/31/98
1                         3.060%             3.690%
2                         3.360%             3.850%
3                         3.510%             3.950%
4                         3.630%             4.040%
5                         3.730%             4.090%
6                         3.825%             4.160%
7                         3.920%             4.230%
8                         4.000%             4.300%
9                         4.080%             4.370%
10                        4.160%             4.440%
11                        4.248%             4.514%
12                        4.336%             4.588%
13                        4.424%             4.662%
14                        4.512%             4.736%
15                        4.600%             4.810%
16                        4.636%             4.836%
17                        4.672%             4.862%
18                        4.708%             4.888%
19                        4.744%             4.914%
20                        4.780%             4.940%
21                        4.784%             4.942%
22                        4.788%             4.944%
23                        4.792%             4.946%
24                        4.796%             4.948%
25                        4.800%             4.950%
26                        4.804%             4.954%
27                        4.808%             4.958%
28                        4.812%             4.962%
29                        4.816%             4.966%
30                        4.820%             4.970%

Source: Bloomberg Financial Markets

"FOR THE SIX MONTHS, THE YIELD ON ONE-YEAR MUNICIPAL  SECURITIES FELL ROUGHLY 62
BASIS POINTS  (0.62%--A  BASIS POINT EQUALS  0.01%),  WHILE THE YIELD ON 30-YEAR
MUNICIPAL BONDS FELL ONLY ABOUT 15 BASIS POINTS."


                                                  www.americancentury.com      3


Florida Intermediate-Term--Performance
- --------------------------------------------------------------------------------
TOTAL RETURNS AS OF NOVEMBER 30, 1998
<TABLE>
                                INCEPTION 4/11/94
                       FLORIDA
                     INTERM.-TERM   LEHMAN 5-YEAR   FLORIDA INTERM. MUNICIPAL DEBT FUNDS(2)
                      MUNICIPAL        GO INDEX       AVERAGE RETURN    FUND'S RANKING
- ----------------------------------------------------------------------------------------
<S>                 <C>             <C>             <C>               <C>                  
6 MONTHS(1) .........   3.95%           3.43%             3.05%              --
1 YEAR ..............   7.39%           6.32%             6.12%          1 OUT OF 15
- ----------------------------------------------------------------------------------------
AVERAGE ANNUAL RETURNS
3 YEARS(3) ..........   6.25%           5.68%             5.09%          1 OUT OF 11
LIFE OF FUND(3) .....   6.97%           6.26%(4)          5.85%(4)       1 OUT OF 10(4)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Returns and rankings  would have been lower if management  fees had not been
    waived.

(4) Since 4/30/94,  the date nearest the fund's  inception for which return data
    are available.

See pages 17-18 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain chart - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 11/30/98
Florida Intermediate-Term Municipal       $13,551
Lehman 5-Year GO Index                    $12,808

                   Florida
                 Intermediate-       Lehman 5-Year
                Term Municipal          GO Index
DATE                 VALUE               VALUE
4/30/94*            $10,000             $10,000
6/30/94             $10,054             $9,996
9/30/94             $10,173             $10,077
12/31/94            $10,031             $10,044
3/31/95             $10,539             $10,450
6/30/95             $10,811             $10,717
9/30/95             $11,068             $11,010
12/31/95            $11,396             $11,211
3/31/96             $11,338             $11,246
6/30/96             $11,361             $11,295
9/30/96             $11,561             $11,479
12/31/96            $11,812             $11,730
3/31/97             $11,830             $11,711
6/30/97             $12,205             $12,002
9/30/97             $12,514             $12,264
12/31/97            $12,784             $12,490
3/31/98             $12,918             $12,636
6/30/98             $13,094             $12,764
9/30/98             $13,315             $12,983
11/30/98            $13,551             $12,808

$10,000 investment made 4/30/94

The chart at left shows the growth of a $10,000  investment over the life of the
fund,  while the chart  below  shows the fund's  year-by-year  performance.  The
Lehman  5-Year  GO Index is  provided  for  comparison  in each  chart.  Florida
Intermediate-Term  Municipal's  returns  include  operating  expenses  (such  as
transaction costs and management fees) that reduce returns, while the returns of
the index do not. Past performance does not guarantee future results. Investment
return and principal value will fluctuate,  and redemption  value may be more or
less than original cost.

[bar chart - data below]

ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDED NOVEMBER 30)

                     Florida
                Intermediate-Term    Lehman 5-Year
                    Municipal          GO Index
DATE                 RETURN             RETURN
11/30/94*            -1.24%             -0.07%
11/30/95             14.39%             11.99%
11/30/96              4.61%              5.36
11/30/97              6.78%              5.38
11/30/98              7.39%              6.32

* From 4/30/94 (the date nearest the fund's  inception  for which index data are
  available).


4      1-800-345-2021


Florida Intermediate-Term--Q&A
- --------------------------------------------------------------------------------
/photo of Ken Salinger/

     An  interview  with  Ken  Salinger,  a  portfolio  manager  on the  Florida
Intermediate-Term Municipal investment team.

HOW DID THE FUND PERFORM FOR THE SIX MONTHS ENDED NOVEMBER 30, 1998?

     Florida   Intermediate-Term   Municipal  continued  to  provide  noteworthy
returns.  For the six-months  ended November 30, 1998, the fund returned  3.95%,
solidly outperforming the 3.05% return of the 15 "Florida Intermediate Municipal
Funds" tracked by Lipper Inc. Florida Intermediate-Term Municipal's returns also
surpassed the 3.43% return of its benchmark, the Lehman 5-Year GO Index.

     In addition,  Florida Intermediate-Term  Municipal's one-year,  three-year,
and  life-of-fund  returns  earned the fund a  number-one  ranking in its Lipper
category and also  outpaced the fund's  benchmark.  (See Total Returns on page 4
for fund performance comparisons.)

     The fund also recently received Morningstar's much-coveted five-star rating
for three-year and overall performance.  Morningstar proprietary ratings reflect
risk-adjusted performance as of December 31, 1998. The overall rating, which may
change monthly,  is calculated from the fund's three-,  five-, and 10-year (when
available)  average total returns in excess of 90-day Treasury bill returns with
appropriate  fee  adjustments  and a risk factor that reflects fund  performance
below 90-day Treasury bill returns.

     The top ten percent of funds in an investment  category receive five stars,
the next 22.5% receive four stars,  the next 35% receive  three stars,  the next
22.5% receive two stars, and the bottom ten percent receive one star.

HOW DID FLORIDA INTERMEDIATE-TERM MUNICIPAL'S YIELD STACK UP?

     The fund offered investors  significantly more federal tax-free income than
its peers.  The most common way of gauging a fund's  income is by looking at its
30-day SEC yield.  This yield  represents  net  investment  income earned over a
30-day period and is expressed as an annual  percentage rate based on the fund's
share price at the end of the 30 days.

     As of November 30, Florida  Intermediate-Term  Municipal's 30-day SEC yield
was  3.71%,  compared  with the  3.35%  average  yield of  Florida  intermediate
municipal funds.

WHAT FUELED THE FUND'S PERFORMANCE?

     Effective   duration    management--controlling   the   portfolio's   price
sensitivity  to  changes  in  interest   rates--continued  to  be  an  important
contributor.  We kept the portfolio's  duration slightly longer than that of the
average Florida  intermediate  municipal fund  throughout the six-month  period.
(Remember,  the longer the fund's duration,  the more its share price rises when
rates fall;  however,  a longer  duration  also causes the fund's share price to
fall more when rates rise.) We chose this position because we strongly  believed
that global  pressures  and benign  inflation  would lead to lower rates,  which
proved to be the case.

[right margin]

"FLORIDA INTERMEDIATE-TERM MUNICIPAL CONTINUED TO PROVIDE NOTEWORTHY RETURNS."

YIELDS AS OF NOVEMBER 30, 1998
  30-DAY SEC YIELD
                                   3.71%
  30-DAY TAX-EQUIVALENT YIELDS
    28.0% TAX BRACKET              5.15%
    31.0% TAX BRACKET              5.38%
    36.0% TAX BRACKET              5.80%
    39.6% TAX BRACKET              6.14%

PORTFOLIO AT A GLANCE
                                 11/30/98           5/31/98
NUMBER OF SECURITIES                52                45
WEIGHTED AVERAGE
  MATURITY                        8.9 YRS           8.5 YRS
AVERAGE DURATION                  5.6 YRS           5.6 YRS
EXPENSE RATIO                     0.51%*             0.54%

* Annualized.

Investment terms are defined in the Glossary on page 18.


                                                  www.americancentury.com      5


Florida Intermediate-Term--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

     But we certainly can't predict the short-term  direction of interest rates.
Therefore,  even when we feel  strongly  about the  direction in which rates are
headed, we manage Florida Intermediate-Term Municipal's duration conservatively.
This prevents returns from fluctuating wildly from period to period.

     Generally  speaking,  we keep  duration in a narrow band around the average
duration of other Florida  intermediate  municipal funds.  For example,  we kept
duration around 5.6 years for most of the six-month period, only slightly longer
than the average duration of the fund's peers.

IF NOT THROUGH AGGRESSIVE DURATION MANAGEMENT, THEN HOW DO YOU ENHANCE RETURNS?

     Simply  put,  we stay on top of the market and search  diligently  for good
values.  Finding  securities  that we believe are undervalued is a top priority.
Adding undervalued securities to the portfolio can significantly enhance returns
while often adding little or no risk. That was primarily how we enhanced returns
during the six-month period.

     To take advantage of opportunities  when we find them, we keep a portion of
the  portfolio in very liquid  municipals--ones  we can sell quickly to generate
cash to buy new, undervalued  securities.  Typically,  these sales generate very
small capital gains or losses for the fund,  which helps prevent excess year-end
distributions.

HOW DO YOU FIND THESE UNDERVALUED SECURITIES?

     Our experienced research team plays a pivotal role by helping us stay close
to Florida municipal credit trends. Florida is a complex,  dynamic state, making
thorough  research  and analysis of its  municipalities  a vital  ingredient  to
Florida Intermediate-Term Municipal's success.

     After we find what we  believe  is an  attractively  valued  security,  our
research team provides input on the credit quality of the issuer.  If the credit
story passes our rigorous standards,  we add the security to the portfolio.  Our
credit  team can also  instigate  the  process--the  team  often  uncovers  such
securities while watching the market.

     These undervalued  securities can appreciate in value as a result of credit
upgrades.  This  process  helps us stay in  front  of what we call the  "upgrade
curve" (the chance for securities to appreciate in value as a result of a credit
upgrade).

CAN YOU CITE SOME SECURITIES YOU FOUND THROUGH THIS PROCESS?

     In July,  we added some  municipal  notes  issued by Barry  University,  an
international  university  founded in 1940 and  located in Miami  Shores.  These
municipals were rated BBB and  attractively  priced with relatively high yields.
However,   because   the   securities   were  on  the  lower   end  of   Florida
Intermediate-Term Municipal's rating limitations, our credit team was especially
careful in its research. Once the team

[left margin]

"ADDING UNDERVALUED SECURITIES TO THE PORTFOLIO CAN SIGNIFICANTLY ENHANCE
RETURNS WHILE OFTEN ADDING LITTLE OR NO RISK. . ."

TOP FIVE SECTORS (AS OF 11/30/98)
                            % OF FUND INVESTMENTS
TRANSPORTATION REVENUE                30%
SALES TAX REVENUE                     10%
HOUSING REVENUE                        9%
GO                                     8%
ELECTRIC REVENUE                       7%

TOP FIVE SECTORS (AS OF 5/31/98)
                            % OF FUND INVESTMENTS
TRANSPORTATION REVENUE                28%
GO                                    14%
HOUSING REVENUE                       14%
SPECIAL TAX REVENUE                   13%
SALES TAX REVENUE                     10%


6      1-800-345-2021


Florida Intermediate-Term--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

decided  it was  very  comfortable  with  the  credit  of the  Barry  University
securities, we added several bonds--which ranged in maturity from three to eight
years--to the portfolio.

     This increased the portfolio's  holdings of BBB securities to slightly over
3% of assets (see the table on page 7),  which was  comfortably  balanced by the
roughly 7% position in AAA-rated holdings we added during the six months.

LOOKING AHEAD TO THE NEXT SIX MONTHS, WHAT'S IN STORE FOR THE MUNICIPAL MARKET?

     We think the next six months will be fairly  upbeat for  Florida  municipal
investors.  On the inflation  front,  all is  quiet--for  the first 11 months of
1998,  overall  consumer  prices  crawled ahead at an  annualized  rate of 1.6%.
Global crises drove interest rates lower and led to short-term  rate  reductions
by the Federal Reserve (see page 3).

     Another  important  factor  working in favor of municipal  investors is the
relative  performance  of municipal  and Treasury  securities.  Global  economic
turmoil,  equity-market  volatility,  presidential impeachment proceedings,  and
problems in the Persian Gulf caused demand for U.S.  Treasury  securities to far
outstrip  demand  for  municipals  during the past six  months.  This has driven
municipal  yields to historically  high ratios  relative to  comparable-maturity
Treasury yields.

     For  example,  longer-term  municipal  yields  were nearly 100% of Treasury
yields by the end of November. Historically speaking, that ratio has been closer
to 83%. The value  disparity  means that even  investors in a relatively low tax
bracket will generally  receive more after-tax income from municipal bonds right
now than from comparable-maturity Treasurys.

     When demand for Treasurys  eventually  tapers off, we expect  municipals to
outperform  Treasurys as their yield  relationship  returns to more historically
normal ratios.

GIVEN THAT OUTLOOK, WHAT ARE YOUR PLANS FOR FLORIDA INTERMEDIATE-TERM MUNICIPAL

     For now, we plan to maintain a slightly  long  duration  compared  with the
average Florida intermediate municipal fund. If interest rates continue to fall,
or if demand for municipal  securities  rises,  the portfolio's  longer duration
should boost returns.

[right margin]

"ANOTHER IMPORTANT FACTOR WORKING IN FAVOR OF MUNICIPAL INVESTORS IS THE
RELATIVE PERFORMANCE OF MUNICIPAL AND TREASURY SECURITIES."

PORTFOLIO COMPOSITION BY CREDIT RATING
            % OF FUND INVESTMENTS
              AS OF        AS OF
            11/30/98      5/31/98
AAA            81%          71%
AA             13%          20%
A              3%           9%
BBB            3%           --

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 17
for more information.


                                                  www.americancentury.com      7


Florida Intermediate-Term--Sch. of Investments
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--94.5%
FLORIDA--93.1%
               $  300,000  Boca Raton Water and Sewer
                              Rev., 6.40%, 10/1/02                 $   306,750
                  300,000  Broward County School District
                              GO, 6.75%, 2/15/00                       308,022
                  500,000  Dade County Aviation Rev.,
                              Series 1995 E, 5.50%,
                              10/1/10 (AMBAC)                          543,435
                1,000,000  Dade County Aviation Rev.,
                              Series 1997 A, (Miami
                              International Airport), 5.50%,
                              10/1/02 (FSA)                          1,059,180
                  500,000  Duval County School District GO,
                              6.25%, 8/1/05 (AMBAC)                    540,760
                  500,000  East County Water Control District
                              Rev., 5.375%, 11/1/01
                              (Asset Guaranty)                         523,310
                  270,000  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., 6.00%, 4/1/02
                              (GNMA/FNMA)                              281,591
                  220,000  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., Series 1998 A,
                              4.80%, 4/1/06 (GNMA/FNMA)                224,030
                  350,000  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., Series 1998 A,
                              4.85%, 4/1/07 (GNMA/FNMA)                356,346
                1,810,000  Florida Board of Education
                              Capital Outlay GO,
                              Series 1998 C, 4.50%, 6/1/22 (FSA)     1,701,183
                1,000,000  Florida Department of Children &
                              Families COP, (South Florida
                              State Hospital), 4.30%, 7/1/08
                              (AMBAC)(1)                             1,007,710
                1,000,000  Florida Gas Utility Rev., (Gas
                              Project No. 1), 4.00%,
                              12/1/04 (FSA)                          1,007,170
                  350,000  Florida Housing Finance Agency
                              Rev., 5.35%, 6/1/00 (GTEED)              352,275
                  450,000  Florida Housing Finance Agency
                              Rev., (Williamsburg Village
                              Apartments), 5.60%, 12/1/07
                              (AMBAC)                                  485,478
                  500,000  Florida Housing Finance Agency
                              Rev., (Windwood), 5.65%,
                              12/1/07 (AXA Insurance)                  533,900
                1,955,000  Florida Turnpike Auth. Rev.,
                              (Department of Transportation),
                              Series 1993 A, 5.00%,
                              7/1/13 (FGIC)                          1,995,019
                  350,000  Gainesville Utilities System Rev.,
                              Series 1996 A, 5.75%,
                              10/1/09                                  396,001

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
               $1,000,000  Gulf Breeze Rev., Series 1997 B,
                              (Capital Funding), 4.50%,
                              10/1/27 (MBIA)                       $   930,500
                  400,000  Hillsborough County Port District
                              Special Rev., 6.50%, 6/1/04
                              (FSA)                                    447,596
                  750,000  Indian Trace Community
                              Development District Water
                              Management Special Benefit
                              Assessment, 5.00%, 5/1/10
                              (MBIA)                                   789,525
                  400,000  Indian Trace Community
                              Development District Water
                              Special Benefit Assessment,
                              Series 1995 A, 5.25%,
                              5/1/03 (MBIA)                            423,464
                  500,000  Jacksonville Electric Auth. Rev.,
                              Series 1995 6-C, (St. John's
                              River Power), 6.50%, 10/1/01             532,025
                1,250,000  Jacksonville Excise Tax Rev.,
                              5.20%, 10/1/04 (FGIC)                  1,300,088
                  865,000  Lee County Passenger Facility
                              Charge Rev., 4.50%, 10/1/05
                              (AMBAC)                                  886,703
                1,000,000  Lee County Rev., Series 1997 A,
                              5.75%, 10/1/11 (MBIA)                  1,129,680
                  650,000  Miami Parking Facilities Rev.,
                              5.25%, 10/1/15 (MBIA)                    687,726
                1,000,000  Miami-Dade County Aviation Rev.,
                              Series 1998 A, 5.00%,
                              10/1/06 (FGIC)                         1,053,920
                1,000,000  Miami-Dade County Aviation Rev.,
                              Series 1998 A, 5.25%,
                              10/1/07 (FGIC)                         1,071,060
                1,015,000  Northern Palm Beach County
                              Improvement District Special
                              Assessment, (Unit
                              Development 18), 4.90%,
                              8/1/13 (MBIA)                          1,048,810
                  550,000  Orange County Health Facilities
                              Auth. Rev., Series 1996 A,
                              6.00%, 10/1/04 (MBIA)                    606,568
                1,000,000  Orlando and Orange County
                              Expressway Auth. Rev., 5.10%,
                              7/1/04 (FGIC)                          1,054,840
                  450,000  Orlando and Orange County
                              Expressway Auth. Rev., 6.50%,
                              7/1/11 (FGIC)                            539,838
                  500,000  Orlando Utility Commission Water
                              and Electric Rev., 5.70%,
                              10/1/04                                  548,320
                1,500,000  Palm Beach County Criminal
                              Justice Facilities Rev., 5.375%,
                              6/1/07 (FGIC)                          1,643,460
                  500,000  Pensacola Airport Rev.,
                              Series 1997 B, 5.40%,
                              10/1/07 (MBIA)                           542,920

                                              See Notes to Financial Statements


8      1-800-345-2021


Florida Intermediate-Term--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
              $   300,000  Pensacola Airport Rev.,
                              Series 1998 A, 6.00%,
                              10/1/01 (MBIA)                       $   318,273
                  360,000  Pinellas County Educational
                              Facilities Auth. Rev., (Barry
                              University), 4.45%, 10/1/01              364,284
                  450,000  Pinellas County Educational
                              Facilities Auth. Rev., (Barry
                              University), 4.85%, 10/1/06              458,492
                  430,000  Pinnellas County Educational
                              Facilities Auth. Rev., (Barry
                              University), 4.75%, 10/1/05              437,254
                  300,000  Plantation Health Facilities Auth.
                              Rev., (Covenant Village of
                              Florida Inc.), 4.45%, 12/1/04            303,864
                  300,000  Plantation Health Facilities Auth.
                              Rev., (Covenant Village of
                              Florida Inc.), 4.55%, 12/1/05            304,584
                  300,000  Plantation Health Facilities Auth.
                              Rev., (Covenant Village of
                              Florida Inc.), 4.70%, 12/1/07            304,956
                1,000,000  Polk County Housing Finance
                              Auth. Multi-Family Housing Rev.,
                              Series 1997 A, (Winter Oaks
                              Apartments), 5.25%, 7/1/07
                              (FNMA)(2)                              1,052,960
                  200,000  Reedy Creek Improvement
                              District Utility Rev., Series
                              1991-1, 6.25%, 10/1/01,
                              Prerefunded at 101% of Par
                              (MBIA)(3)                                216,132
                  400,000  St. Cloud Utility Rev., 6.40%,
                              8/1/06 (MBIA)                            433,780
                1,000,000  Tampa Rev., Series 1998 A1,
                              (Catholic Health), 5.25%,
                              11/15/05 (MBIA)                        1,073,058

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
               $  175,000  Tampa Palms Community
                              Development Special
                              Assessment Rev., 4.90%,
                              5/1/99 (MBIA)                        $   176,339
                1,000,000  Tampa Sports Auth. Rev., 4.50%,
                              1/1/99 (MBIA)                          1,001,270
                  500,000  Volusia County School District GO,
                              6.20%, 8/1/03 (FGIC)                     539,705
                                                                  -------------
                                                                    33,844,154
                                                                  -------------
VIRGIN ISLANDS--1.4%
                  500,000  Virgin Islands Water & Power Auth.
                              Electric System Rev., 5.125%,
                              7/1/04                                   520,980
                                                                  -------------
TOTAL MUNICIPAL SECURITIES                                          34,365,134
                                                                  -------------
   (Cost $33,320,378)

SHORT-TERM MUNICIPAL SECURITIES--5.5%
                1,000,000  Dade County Industrial
                              Development Auth. Exempt
                              Facilities Rev., (Florida Power &
                              Light Co.), VRDN, 3.30%,
                              12/2/98                                1,000,000
                1,000,000  Florida Board of Education Capital
                              Outlay GO Trust Receipts, VRDN,
                              3.45%, 12/3/98 (SBBPA:
                              Societe Generale) (Acquired
                              11/6/98, Cost $1,000,000)(4)           1,000,000
                                                                  -------------
TOTAL SHORT-TERM MUNICIPAL SECURITIES                                2,000,000
                                                                  -------------
   (Cost $2,000,000)

TOTAL INVESTMENT SECURITIES--100.0%                                $36,365,134
                                                                  =============
   (Cost $35,320,378)

See Notes to Financial Statements


                                                  www.americancentury.com      9


Florida Intermediate-Term--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

COP = Certificates of Participation

FGIC = Financial Guaranty Insurance Co.

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GNMA = Government National Mortgage Association

GO = General Obligation

GTEED = Connecticut General Life Guaranty Agreement

MBIA = MBIA Insurance Corp.

SBBPA = Standby Bond Purchase Agreement

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
   calculating the weighted average portfolio maturity.  Rate shown is effective
   November 30, 1998.

(1)  When-issued security.

(2)  Security,  or a portion thereof,  has been segregated at the custodian bank
     for when-issued securities.

(3)  Escrowed  to  maturity  in U.S.  government  or state and local  government
     securities.

(4)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement,  and unless registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate  value of these  securities at November 30, 1998,  was $1,000,000
     which represented 2.9% of net assets.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


10      1-800-345-2021


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

ASSETS
Investment securities, at value
  (identified cost of $35,320,378)
  (Note 3) ................................................          $36,365,134
Investment in affiliated money
  market fund (Note 2) ....................................              310,629
Interest receivable .......................................              445,496
                                                                     -----------
                                                                      37,121,259
                                                                     -----------
LIABILITIES
Disbursements in excess
  of demand deposit cash ..................................            1,491,559
Payable for investments purchased .........................            1,051,688
Payable for capital shares redeemed .......................                6,829
Dividends payable .........................................               12,558
Accrued management fees
  (Note 2) ................................................               14,189
Payable for trustees' fees
  and expenses ............................................                  128
                                                                     -----------
                                                                       2,576,951
                                                                     -----------
Net Assets ................................................          $34,544,308
                                                                     ===========
CAPITAL SHARES
Outstanding (unlimited number
  of shares authorized) ...................................            3,212,692
                                                                     ===========
Net Asset Value Per Share .................................          $     10.75
                                                                     ===========
NET ASSETS CONSIST OF:
Capital paid in ...........................................          $33,110,068
Accumulated undistributed net
  realized gain on investments ............................              389,484
Net unrealized appreciation
  on investments (Note 3) .................................            1,044,756
                                                                     -----------
                                                                     $34,544,308
                                                                     ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of fund shares  outstanding  gives you the price of an individual  share, or the
net asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
gains  earned on  investment  activity but not yet paid to  shareholders  or net
losses on investment activity (known as realized gains or losses);  and gains or
losses on securities  still owned by the fund (known as unrealized  appreciation
or  depreciation).  This  breakdown  tells you the value of net assets  that are
performance-related,  such as investment  gains or losses,  and the value of net
assets that are not related to performance,  such as shareholder investments and
redemptions.

See Notes to Financial Statements


                                                 www.americancentury.com      11


Statement of Operations
- --------------------------------------------------------------------------------

FOR THE SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED)

INVESTMENT INCOME
Income:
Interest ...................................................          $  747,321
                                                                      ----------
Expenses (Note 2):
Management fees ............................................              79,758
Trustees' fees and expenses ................................               2,153
                                                                      ----------
                                                                          81,911
                                                                      ----------
Net investment income ......................................             665,410
                                                                      ----------
REALIZED AND UNREALIZED
GAIN ON INVESTMENTS (NOTE 3)
Net realized gain on investments ...........................             257,208
Change in net unrealized appreciation
  on investments ...........................................             297,965
                                                                      ----------
Net realized and unrealized
  gain on investments ......................................             555,173
                                                                      ----------
Net Increase in Net Assets
  Resulting from Operations ................................          $1,220,583
                                                                      ==========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized appreciation or
  depreciation)

                                              See Notes to Financial Statements


12      1-800-345-2021


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED) AND YEAR ENDED MAY 31, 1998

Increase in Net Assets
                                                   NOVEMBER 30,       MAY 31,
                                                      1998             1998
OPERATIONS
Net investment income ....................      $    665,410       $  1,042,897
Net realized gain on investments .........           257,208            397,759
Change in net unrealized
  appreciation on investments ............           297,965            439,483
                                                ------------       ------------
Net increase in net assets
  resulting from operations ..............         1,220,583          1,880,139
                                                ------------       ------------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income ...............          (665,410)        (1,042,897)
From net realized gains on
  investment transactions ................              --             (316,935)
                                                ------------       ------------
Decrease in net assets
  from distributions .....................          (665,410)        (1,359,832)
                                                ------------       ------------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ................         8,149,497         28,435,575
Proceeds from reinvestment
  of distributions .......................           389,269            976,870
Payments for shares redeemed .............        (4,154,843)       (16,840,155)
                                                ------------       ------------
Net increase in net assets
  from capital share transactions ........         4,383,923         12,572,290
                                                ------------       ------------
Net increase in net assets ...............         4,939,096         13,092,597

NET ASSETS
Beginning of period ......................        29,605,212         16,512,615
                                                ------------       ------------
End of period ............................      $ 34,544,308       $ 29,605,212
                                                ============       ============

TRANSACTIONS IN
SHARES OF THE FUND
Sold .....................................           761,666          2,709,826
Issued in reinvestment
  of distributions .......................            36,518             92,680
Redeemed .................................          (389,384)        (1,596,282)
                                                ------------       ------------
Net increase .............................           408,800          1,206,224
                                                ============       ============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
  redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital share  transactions  results in net
assets at the end of the period.

See Notes to Financial Statements


                                                 www.americancentury.com      13


Notes to Financial Statements
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     ORGANIZATION--American  Century  Municipal  Trust (the Trust) is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company. American Century - Benham Florida Intermediate-Term Municipal Fund (the
Fund) is one of the eight Funds issued by the Trust. The Fund is non-diversified
under  the 1940  Act.  Its  investment  objective  is to seek as high a level of
current  income exempt from federal  income taxes as is consistent  with prudent
investment  management  and  conservation  of  shareholders'  capital.  The Fund
invests  primarily in Florida municipal  obligations.  The Fund concentrates its
investments  in a single state and  therefore  may have more  exposure to credit
risk  related  to the state of Florida  than a fund with a broader  geographical
diversification. The following significant accounting policies are in accordance
with generally accepted accounting principles.

     SECURITY  VALUATIONS--Portfolio  securities  held by the  Fund  are  valued
through a commercial  pricing  service or at the mean of the most recent bid and
asked prices.  When valuations are not readily available,  securities are valued
at fair value as determined in accordance with  procedures  adopted by the Board
of Trustees.

     SECURITY  TRANSACTIONS--Security  transactions  are accounted for as of the
trade date. Net realized gains and losses are determined on the identified  cost
basis, which is also used for federal income tax purposes.

     INVESTMENT  INCOME--Interest  income is recorded  on the accrual  basis and
includes accretion of discounts and amortization of premiums.

     INCOME TAX STATUS--It is the Fund's policy to distribute all net investment
income and net realized  gains to  shareholders  and to  otherwise  qualify as a
regulated  investment company under the provisions of the Internal Revenue Code.
Accordingly, no provision has been made for federal or state income taxes.

     DISTRIBUTIONS TO SHAREHOLDERS--Distributions from net investment income are
declared daily and distributed monthly.  Distributions from net realized capital
gains are declared and paid annually.

     On December 11, 1998, the Fund declared and paid a distribution  of $0.1121
per share from net realized gains on investments  to  shareholders  of record on
that date.

     The  character of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes.  These differences  reflect the differing character
of certain income items and net capital gains and losses for financial statement
and tax  purposes  and may  result in  reclassification  among  certain  capital
accounts.

     FUTURES  CONTRACTS--The  Fund  may  buy  and  sell  interest  rate  futures
contracts  relating to debt  securities  and write and buy put and call  options
relating  to  interest  rate  futures  contracts.  The Fund may use  futures and
options  transactions  to maintain cash reserves while remaining fully invested,
to  facilitate  trading,  to  reduce  transaction  costs,  or to  pursue  higher
investment  returns when a futures contract is priced more attractively than its
underlying  security  or  index.  One of the  risks  of  entering  into  futures
contracts may include the possibility  that the changes in value of the contract
may not correlate with the changes in value of the underlying  securities.  Upon
entering into a futures contract, the Fund is required to deposit either cash or
securities  in an amount equal to a certain  percentage  of the  contract  value
(initial margin).  Subsequent  payments  (variation margin) are made or received
daily,  in cash, by the Fund. The variation  margin is equal to the daily change
in the contract  value and is recorded as an unrealized  gain or loss.  The Fund
recognizes a realized gain or loss when the contract is closed or expires. There
were no open futures contracts at November 30, 1998.

     ADDITIONAL  INFORMATION--Funds  Distributor,  Inc.  (FDI)  is  the  Trust's
distributor. Certain officers of FDI are also officers of the Trust.


14      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

     The Trust has entered into a Management  Agreement  with ACIM that provides
the Fund with  investment  advisory  and  management  services in exchange for a
single,  unified  management  fee.  Expenses  excluded  from the  agreement  are
brokerage,  taxes,  portfolio  insurance,  interest,  fees and expenses of those
Trustees  who  are  not  considered  "interested  persons"  as  defined  in  the
Investment  Company  Act of 1940  (including  counsel  fees)  and  extraordinary
expenses. The annual rate at which this fee is assessed is determined monthly in
a two-step  process:  First, a fee rate schedule is applied to the net assets of
all of the funds in the Fund's  investment  category  which are  managed by ACIM
(the "Investment  Category Fee"). The overall investment  objective of each Fund
determines its Investment  Category.  The three  investment  categories are: the
Money  Market  Fund  Category,  the Bond  Fund  Category,  and the  Equity  Fund
Category. The Fund is included in the Bond Fund Category. Second, a separate fee
rate  schedule is applied to the net assets of all of the funds  managed by ACIM
(the "Complex  Fee").  The Investment  Category Fee and the Complex Fee are then
added to determine the unified  management  fee rate. The management fee is paid
monthly by the Fund based on its average  daily  closing  net assets  during the
previous month multiplied by the monthly management fee rate.

     The annualized Investment Category Fee schedule for the Fund is as follows

     0.2800% of the first $1 billion 
     0.2280% of the next $1 billion 
     0.1980% of the next $3 billion 
     0.1780% of the next $5 billion 
     0.1650% of the next $15 billion 
     0.1630% of the next $25 billion
     0.1625% of the average daily net assets over $50 billion

     The annualized Complex Fee schedule is as follows:

     0.3100% of the first $2.5 billion 
     0.3000% of the next $7.5 billion 
     0.2985% of the next $15 billion 
     0.2970% of the next $25 billion 
     0.2960% of the next $50 billion 
     0.2950% of the next $100 billion 
     0.2940% of the next $100 billion 
     0.2930% of the next $200 billion 
     0.2920% of the next $250 billion
     0.2910% of the next $500 billion
     0.2900% of the average daily net assets over $1,250 billion

     Certain  officers  and  trustees  of the  Trust  are also  officers  and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the Trust's  investment  manager,  ACIM, and the
Trust's transfer agent, American Century Services Corporation.

     As of  November  30,  1998,  the Fund had  invested  $310,629  in shares of
American  Century - Benham  Florida  Municipal  Money Market Fund (Money  Market
Fund).  The terms of the  transaction  were identical to those with  non-related
entities except that, to avoid duplicative management fees, the Fund did not pay
ACIM management fees with respect to assets invested in the Money Market Fund.

- --------------------------------------------------------------------------------
3. INVESTMENT TRANSACTIONS

     Purchases and sales of municipal  debt  obligations,  excluding  short-term
investments, totaled $30,242,753 and $26,037,068, respectively.

     As of November 30, 1998,  accumulated net unrealized  appreciation  for the
Fund was $1,044,756,  which  consisted of unrealized  appreciation of $1,059,784
and unrealized  depreciation  of $15,028.  The aggregate cost of investments for
federal  income tax  purposes was the same as the cost for  financial  reporting
purposes.

- --------------------------------------------------------------------------------
4. BANK LOANS

     Effective  December 18,  1998,  the Fund,  along with  certain  other funds
managed by ACIM,  entered  into an  unsecured  $570,000,000  bank line of credit
agreement with Chase Manhattan.  Borrowings under the agreement bear interest at
the Federal Funds rate plus 0.40%.


                                                 www.americancentury.com      15


Florida Intermediate-Term--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
    FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31 (EXCEPT AS NOTED)

                                        1998(1)            1998            1997           1996          1995        1994(2)
PER-SHARE DATA
Net Asset Value,
<S>                                  <C>               <C>            <C>            <C>            <C>           <C>       
Beginning of Period .................$    10.56        $    10.34     $    10.18     $    10.30     $    10.11    $    10.00
                                     ----------        ----------     ----------     ----------     ----------    ----------
Income From Investment
Operations
  Net Investment Income .............      0.22              0.45           0.46           0.52           0.52          0.07
  Net Realized and Unrealized
  Gain (Loss)
  on Investment Transactions ........      0.19              0.38           0.20          (0.08)          0.19          0.11
                                     ----------        ----------     ----------     ----------     ----------    ----------
  Total From Investment Operations ..      0.41              0.83           0.66           0.44           0.71          0.18
                                     ----------        ----------     ----------     ----------     ----------    ----------
Distributions
  From Net Investment Income ........     (0.22)            (0.45)         (0.46)         (0.52)         (0.52)        (0.07)
  From Net Realized Capital Gains ...      --               (0.16)         (0.04)         (0.04)          --            --
                                     ----------        ----------     ----------     ----------     ----------    ----------
  Total Distributions ...............     (0.22)            (0.61)         (0.50)         (0.56)         (0.52)        (0.07)
                                     ----------        ----------     ----------     ----------     ----------    ----------
Net Asset Value, End of Period ......$    10.75        $    10.56     $    10.34     $    10.18     $    10.30    $    10.11
                                     ==========        ==========     ==========     ==========     ==========    ==========
  Total Return(3) ...................      3.95%             8.20%          6.63%          4.34%          7.31%         1.79%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
  to Average Net Assets .............      0.51%(4)          0.54%          0.65%          0.13%          --            --
Ratio of Operating Expenses
  to Average Net Assets
  (Before Expense Waiver) ...........      0.51%(4)          0.58%          0.86%          0.88%          1.09%         1.92%(4)
Ratio of Net Investment Income
  to Average Net Assets .............      4.12%(4)          4.28%          4.42%          5.05%          5.23%         5.02%(4)
Ratio of Net Investment Income
  to Average Net Assets
  (Before Expense Waiver) ...........      4.12%(4)          4.24%          4.21%          4.30%          4.14%         3.10%(4)
Portfolio Turnover Rate .............        82%              154%            82%            66%            37%            6%
Net Assets, End of Period
(in thousands) ......................$   34,544        $   29,605     $   16,513     $   10,319     $    9,532    $    5,892
</TABLE>

(1) Six months ended November 30, 1998 (unaudited).

(2) April 11, 1994 (inception) through May 31, 1994.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  statement itemizes current period
activity and  statistics and provides  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

                                              See Notes to Financial Statements


16      1-800-345-2021


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     The Benham Group offers 38  fixed-income  funds,  ranging from money market
funds to long-term bond funds and including  both taxable and tax-exempt  funds.
Each fund is  managed  to  provide  a "pure  play" on a  specific  sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's  portfolio  is tied to a specific  market  index.  Fund  managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

     In addition to these principles, the fund has its own investment policies:

     FLORIDA  INTERMEDIATE-TERM  MUNICIPAL  is a  variable-price  bond fund that
invests  primarily  in  intermediate-term   Florida  municipal  securities  with
maturities of four or more years. The fund maintains a weighted average maturity
of 5-10 years.

     Depending  on your tax  status,  investment  income  may be  subject to the
federal  alternative  minimum  tax.  Capital  gains are not exempt from  federal
income tax.

     Fund shares are intended to be exempt from the Florida intangibles tax.

COMPARATIVE INDICES

     The following index is used in the report as a fund performance comparison.
It is not an investment product available for purchase.

     The LEHMAN 5-YEAR  MUNICIPAL  GENERAL  OBLIGATION INDEX is a municipal bond
index  composed of more than 11,000 bonds with  maturities of four to six years.
The bonds are rated BBB or higher by Standard & Poor's,  with an average  rating
of AA. The average maturity of the index is five years.

LIPPER RANKINGS

     LIPPER INC. is an  independent  mutual fund ranking  service.  Rankings are
based on  average  annual  returns  for each  fund in a given  category  for the
periods indicated. Rankings are not included for periods less than one year.

     The funds in Lipper's  FLORIDA  INTERMEDIATE  MUNICIPAL DEBT FUNDS category
invest at least 65% of their  assets in  municipal  debt  issues that are exempt
from taxation in Florida, with dollar-weighted average maturities of 5-10 years

CREDIT RATING GUIDELINES

     Credit  ratings  are  issued  by  independent  research  companies  such as
Standard  & Poor's  and  Moody's.  Ratings  are based on an  issuer's  financial
strength and ability to pay interest and principal in a timely manner.

     It's important to note that credit ratings are  subjective,  reflecting the
opinions of the rating agencies; they are not absolute standards of quality.

     Securities  rated  AAA,  AA, A or BBB are  considered  "investment  grade,"
meaning they're relatively safe from default.

[right margin]

INVESTMENT TEAM LEADERS
  PORTFOLIO MANAGERS
     KEN SALINGER
     DAVE MACEWEN
  MUNICIPAL CREDIT RESEARCH DIRECTOR
     STEVEN PERMUT


                                                 www.americancentury.com      17


Glossary
- --------------------------------------------------------------------------------

RETURNS

* TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on page 16.

YIELDS

* 30-DAY SEC YIELD  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annualized  percentage  rate based on the fund's
share price at the end of the 30-day period. The SEC yield should be regarded as
an estimate  of the fund's  investment  income,  and it may not equal the fund's
actual income distribution rate, the income paid to a shareholder's  account, or
the income reported in the fund's financial statements.

*  TAX-EQUIVALENT  YIELDS show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

INVESTMENT TERMS

* BASIS POINT--a basis point equals one  one-hundredth of a percentage point (or
0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

* YIELD CURVE--a graphic representation of the relationship between maturity and
yield  for  fixed-income   securities.   Yield  curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

PORTFOLIO STATISTICS

* NUMBER OF SECURITIES--the  number of different  securities held by a fund on a
given date.

*  WEIGHTED  AVERAGE  MATURITY  (WAM)--a  measurement  of the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio mature, weighted by dollar amount.

*  AVERAGE  DURATION--another  measure  of  the  sensitivity  of a  fixed-income
portfolio to interest rate changes.  Duration is a time-weighted  average of the
interest and principal payments of the securities in a portfolio.

* EXPENSE RATIO--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

TYPES OF MUNICIPAL SECURITIES

*  COPS/LEASES--securities  issued to finance public property improvements (such
as city halls and police  stations) and  equipment  purchases.  Certificates  of
participation  represent long-term debt obligations,  while leases have a higher
risk profile than GOs because they require annual appropriation.

* GO  BONDS--general  obligation  securities  backed by the taxing  power of the
issuer.

*  LAND-SECURED  BONDS--securities  such as Mello-Roos  bonds and 1915-Act bonds
that are issued to finance real estate development projects.

* PREREFUNDED BONDS/ETM BONDS--securities  refinanced or escrowed to maturity by
the issuer because of their premium coupons (higher-than-market interest rates).
These  bonds  tend to have  higher  credit  ratings  because  they are backed by
Treasury securities.

*  REVENUE  BONDS--securities  backed by  revenues  from  sales  taxes or from a
specific project, system, or facility (such as a hospital,  electric utility, or
water system).


18      1-800-345-2021


Notes
- --------------------------------------------------------------------------------


                                                 www.americancentury.com      19


Notes
- --------------------------------------------------------------------------------


20      1-800-345-2021


[inside back cover]

AMERICAN CENTURY FUNDS
- -------------------------------------------------------------------------------

BENHAM GROUP(reg.sm)
TAXABLE BOND FUNDS
U.S. TREASURY & GOVERNMENT
   Short-Term Treasury
   Short-Term Government
   GNMA
   Intermediate-Term Treasury
   Long-Term Treasury
   Inflation-Adjusted Treasury
   Target Maturities Trust: 2000
   Target Maturities Trust: 2005
   Target Maturities Trust: 2010
   Target Maturities Trust: 2015
   Target Maturities Trust: 2020
   Target Maturities Trust: 2025
CORPORATE & DIVERSIFIED
   Limited-Term Bond
   Intermediate-Term Bond
   Bond
   Premium Bond
   High-Yield Bond
INTERNATIONAL
   International Bond

TAX-FREE & MUNICIPAL BOND FUNDS
MULTIPLE-STATE
   Limited-Term Tax-Free
   Intermediate-Term Tax-Free
   Long-Term Tax-Free
   High-Yield Municipal
SINGLE-STATE
   Arizona Intermediate-Term Municipal
   California High-Yield Municipal
   California Insured Tax-Free
   California Intermediate-Term Tax-Free
   California Limited-Term Tax-Free
   California Long-Term Tax-Free
   Florida Intermediate-Term Municipal

MONEY MARKET FUNDS
TAXABLE
   Capital Preservation
   Government Agency Money Market
   Premium Capital Reserve
   Premium Government Reserve
   Prime Money Market
TAX-FREE & MUNICIPAL
   California Municipal Money Market
   California Tax-Free Money Market
   Florida Municipal Money Market
   Tax-Free Money Market

AMERICAN CENTURY(reg.sm) GROUP
ASSET ALLOCATION
   Strategic Allocation: Conservative
   Strategic Allocation: Moderate
   Strategic Allocation: Aggressive
BALANCED
   Balanced
CONSERVATIVE EQUITY
   Income and Growth
   Equity Income
   Value
   Equity Growth
SPECIALTY
   Utilities
   Real Estate
   Global Natural Resources
   Global Gold
SMALL CAP
   Small Cap Quantitative
   Small Cap Value

TWENTIETH CENTURY GROUP
GROWTH
   Select
   Heritage Growth
   Ultra
AGGRESSIVE GROWTH
   Vista
   Giftrust
   New Opportunities
INTERNATIONAL GROWTH
   International Growth
   International Discovery
   Emerging Markets
GLOBAL
   Global Growth

Please call for a prospectus  or profile on any  American  Century  fund.  These
documents contain important information including charges and expenses,  and you
should read them carefully before you invest or send money.


[right margin]

[american century logo(reg.sm)]
American
Century

P.O. BOX 419200
KANSAS CITY, MISSOURI
64141-6200

INVESTOR SERVICES:
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE:
1-800-345-8765

TELECOMMUNICATIONS DEVICE FOR THE DEAF:
1-800-634-4113 OR 816-444-3485

FAX: 816-340-7962

INTERNET: WWW.AMERICANCENTURY.COM


AMERICAN CENTURY MUNICIPAL TRUST


INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI


THIS REPORT AND THE STATEMENTS IT CONTAINS  ARE SUBMITTED FOR THE GENERAL
INFORMATION  OF OUR SHAREHOLDERS. THE REPORT IS NOT  AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED  BY AN EFFECTIVE
PROSPECTUS.

FUNDS DISTRIBUTOR, INC.
(c) 1998 AMERICAN CENTURY SERVICES CORPORATION


[recycled logo]
Recycled


[back cover]


American Century Investments                                     BULK RATE
P.O. Box 419200                                              U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                   AMERICAN CENTURY
www.americancentury.com                                          COMPANIES



9901                                                    Funds Distributor, Inc.
SH-BKT-15065                      (c)1998 American Century Services Corporation
<PAGE>

[front cover]                                                 NOVEMBER 30, 1998

SEMIANNUAL REPORT
- ----------------
AMERICAN CENTURY

                              [graphic of stairs]

BENHAM GROUP
- ------------------------------------
TAX-FREE MONEY MARKET

                                                 [american century logo(reg.sm)]
                                                                        American
                                                                         Century

[inside front cover]


AMERICAN CENTURY BROKERAGE
- --------------------------------------------------------------------------------

     We're pleased to introduce American Century's new brokerage service,  which
offers a wide range of investment options and features:

     *  FundChoice  Service--Invest  in over 8,000 no-load and load mutual funds
        from hundreds of different fund companies, many with no transaction fees

     *  Buy individual stocks and bonds

     *  24-hour  Internet and  automated  phone trades are just $24.95 for up to
        1,000 shares of stock, and 2 cents per share thereafter

     *  Strong research capability 

        *   Build and track model portfolios

        *   Get news, quotes and charts

        *   Check free Standard & Poor's stock reports

        *   Access Wall Street on Demand(tm),  a research service with more than
            500,000 reports on industry trends,  corporate earnings,  and mutual
            fund analysis

     *  Track your brokerage account on one easy-to-read statement

     *  Unlimited  check writing and a Gold  MasterCard(reg.tm)  ATM/debit  card
        with an American Century Brokerage Access AccountSM (minimum $10,000)

To talk with a Brokerage Associate, call 1-888-345-2071.

WHAT'S NEW . . .

    AMERICAN  CENTURY CATALOG OF TOOLS & SERVICES lists all the free educational
materials available to investors.

    We now have FOUR-PAGE  PROFILES of many of our funds.  The profiles follow a
standard SEC format and are intended to allow investors to compare funds easily.
You can request a profile or the full prospectus. Full prospectuses contain more
detailed fund information and you will continue to receive one after investing.

    In 1999, we will provide  SIMPLIFIED  PROSPECTUSES that highlight  important
information  about our funds,  including  fees and expenses.  More detailed data
will be in the Statement of Additional Information.

    To order any of these materials, please call 1-800-345-2021.

[left margin]

BENHAM GROUP
TAX-FREE MONEY MARKET
(BNTXX)
- ----------------------------------


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     Money market funds such as Tax-Free  Money  Market  reaffirmed  their value
during  the six months  ended  November  30,  1998,  a period of extreme  market
turbulence.  Weakening economic and financial conditions, brought on by problems
in Asia, Russia,  and Latin America,  led to significant stock market volatility
and a dramatic decline in interest rates.

     Volatility was so rampant that the U.S.  central bank, the Federal Reserve,
cut short-term  interest rates three times to help stabilize markets  worldwide.
Money  market  yields fell in  anticipation  of the rate cuts,  but money market
values remained stable amid the ups and downs in bond and stock prices.

     The  third  quarter  of  1998  served  as a good  example  of the  markets'
extremes.  Several major U.S. stock indices hit record highs in mid-July  before
plunging 20% in the following six weeks. In the bond market, high demand for the
safety of Treasury  bonds pushed  yields down to their lowest  levels ever,  but
demand for  corporate  bonds  thinned  to the point  where  trading  was all but
impossible.

     This  type  of  investment  environment  illustrates  the  importance  of a
well-diversified  investment  portfolio.  Allocating  your assets among  stocks,
bonds,  and money  market funds can help  weatherproof  your  portfolio  against
dramatic changes in the economic or investment climate.

     Tax-Free Money Market continued to provide more federal  tax-exempt  income
than most of its peers. We accomplished this by waiving management  expenses for
part  of the  period  and  by  adding  short-term  municipal  securities  to the
portfolio  when  supply  and  demand   fluctuations   created  favorable  buying
opportunities.  Our credit  research  team also closely  monitored the financial
health of the banks that back  municipal  securities,  helping the fund managers
maintain Tax-Free Money Market's high credit quality.

     Another situation we've been watching closely is preparation of the world's
computer  systems  for the  year  2000.  At  American  Century,  we're  devoting
substantial  resources to this endeavor.  Throughout  1999, our technology  team
will  be  extensively  testing  our  systems,   including  those  involved  with
performance and dividend payments.

     Thank you for your continued investment with American Century.

Sincerely,

/s/James E. Stowers, Jr.                 /s/James E. Stowers III
James E. Stowers, Jr.                    James E. Stowers III
Chairman of the Board and Founder        Chief Executive Officer


[right margin]

               Table of Contents
   Report Highlights ......    2
   Services Update ........    3
TAX-FREE MONEY MARKET
   Performance Information     4
   Management Q&A .........    5
   Portfolio Composition
   by Security Type .......    5
   Portfolio Composition
   by Credit Rating .......    6
   Schedule of Investments     7
FINANCIAL STATEMENTS
   Statement of Assets and
   Liabilities ............   13
   Statement of Operations    14
   Statements of Changes
   in Net Assets ..........   15
   Notes to Financial
   Statements .............   16
   Financial Highlights ...   18
OTHER INFORMATION
   Background Information
      Investment Philosophy
      and Policies ........   19
      Lipper Rankings .....   19
      Credit Rating
      Guidelines ..........   19
      Investment and Credit
      Research Teams ......   19
   Glossary ...............   20


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

FUND HIGHLIGHTS

*   Tax-Free  Money  Market  continued  to  provide  a higher  level of  federal
    tax-exempt income than the average tax-free money market fund.

*   Lipper Inc. ranked Tax-Free Money Market number one among 133 "Tax-Exempt
    Money Market Funds" for the 12 months ended November 30.

*   Tax-Free  Money  Market's  exceptional  performance  is  due  in  part  to a
    promotional program in which we waived management expenses.

*   The full  expense  waiver  expired in August,  and we  gradually  reinstated
    management fees until December.

*   The  seven-day  current  yield  declined  because  of the  reinstatement  of
    expenses and market factors that caused interest rates to decline.

*   Even at full expenses,  Tax-Free Money  Market's  management  fees are lower
    than  approximately  75% of tax-free money market funds according to Lipper,
    which should help keep the fund's yield competitive.

*   We continue to manage the  portfolio's  credit  quality  conservatively.  We
    don't take on inappropriate credit risk to boost the fund's yield.

MARKET HIGHLIGHTS

*   U.S. interest rates in general declined because of weakening global economic
    conditions in the wake of a series of financial crises in Asia,  Russia, and
    Latin America.

*   The Federal Reserve cut short-term interest rates three times from September
    through November to stabilize global markets and stimulate the U.S.
    economy.

*   Money market  yields  declined in  anticipation  of the Fed's  interest rate
    cuts.

*   After  successfully  stabilizing  global financial markets with its interest
    rate cuts, we expect the Fed to take a  "wait-and-see"  approach to interest
    rate policy. We won't be surprised if the Fed is done cutting interest rates
    for a while.


[left margin]

"LIPPER INC. RANKED TAX-FREE MONEY MARKET NUMBER ONE AMONG 133 'TAX-EXEMPT
MONEY MARKET FUNDS' FOR THE 12 MONTHS ENDED NOVEMBER 30."

           TAX-FREE MONEY MARKET
                  (BNTXX)
TOTAL RETURNS:              AS OF 11/30/98
    6 Months                      1.68%(1)
    1 Year                           3.56%
NET ASSETS:                 $432.9 million
7-DAY CURRENT YIELD:              2.97%(2)
INCEPTION DATE:                    7/31/84

(1)  Not annualized.
(2)  Without the fee waiver, the fund's yield would have been 2.87%

See Total Returns on page 4.
Investment terms are defined in the Glossary on page 20.


2      1-800-345-2021


Services Update
- --------------------------------------------------------------------------------

     We get many questions from money market investors about our services.  Here
are answers to several frequently asked questions.

CAN I MAKE DIRECT DEPOSITS INTO MY MONEY MARKET FUND?

     Yes. Give us a call, and we can send you the information you need to set up
direct deposit of your paycheck, Social Security check, Treasury Direct interest
payment, military allotment, or payments from other government agencies.

WHAT IS THE HOLDING PERIOD ON NEW DEPOSITS INTO MY ACCOUNT?

     Generally there is an eight-business-day holding period for deposited funds
(initial investments in a new account are held for 15 calendar days). There is a
one-day holding period for U.S.  Treasury checks,  money orders,  and travelers'
checks.

IS THERE AN EASY WAY TO MOVE MONEY FROM MY MONEY  MARKET  ACCOUNT  INTO MY STOCK
AND BOND FUND ACCOUNTS ON A REGULAR BASIS, FOR DOLLAR-COST-AVERAGING PURPOSES?

     Yes. Our "Automatic  Exchange" plan allows  regularly  scheduled  automatic
transfers  from  your  American  Century  money  market  fund  into  any of your
variable-price  American  Century stock or bond funds.  You can arrange for this
service with a phone call.

IS THERE A LIMIT TO THE NUMBER OF  EXCHANGES  I CAN MAKE OUT OF MY MONEY  MARKET
FUND?

     If you are  exchanging  from your money market fund into your bond or stock
fund, there is no limit. However, there is a limit of six exchanges per calendar
year out of your bond and stock funds.

     Exchanges can be made by:

     * calling an Investor Services Representative at 1-800-345-2021

     * calling our Automated Information Line at 1-800-345-8765*

     * writing us a letter

     * visiting our Web site at
       www.americancentury.com*

IS THERE A FEE FOR WRITING CHECKS AGAINST MY MONEY MARKET FUND?

     No. You can write as many checks as you like at no charge, as long as each
check is for $100 or more.

IF  YOU  HAVE  ANY  QUESTIONS   ABOUT  OUR  SERVICES,   CALL  US  TOLL  FREE  AT
1-800-345-2021 OR E-MAIL US AT OUR WEB SITE (WWW.AMERICANCENTURY.COM).

* Requires shareholder authorization.

[right margin]

Accessing your money. . .
WE CAN SEND A CHECK  DIRECTLY TO YOU AT YOUR ADDRESS OF RECORD.  ALL YOU NEED TO
DO IS GIVE US A CALL OR WRITE US A LETTER REQUESTING THE CHECK. WE CAN ALSO MAKE
AUTOMATIC DEPOSITS FROM YOUR MONEY MARKET FUND TO YOUR BANK ACCOUNT.


                                                  www.americancentury.com      3


Tax-Free Money Market--Performance
- --------------------------------------------------------------------------------
TOTAL RETURNS AS OF NOVEMBER 30, 1998
                                       INCEPTION 7/31/84
                          TAX-FREE       TAX-EXEMPT MONEY MARKET FUNDS(2)
                        MONEY MARKET    AVERAGE RETURN     FUND'S RANKING
- ------------------------------------------------------------------------
6 MONTHS(1) ..............  1.68%           1.43%                --
1 YEAR ...................  3.56%           2.96%           1 OUT OF 133
- ------------------------------------------------------------------------
AVERAGE ANNUAL RETURNS
3 YEARS ..................  3.30%           3.01%           8 OUT OF 124
5 YEARS ..................  3.09%           2.92%           15 OUT OF 105
10 YEARS .................  3.59%           3.50%           14 OUT OF 70

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

See pages 19-20 for more information about returns and Lipper fund rankings.

Returns  and  rankings  would  have been lower if  management  fees had not been
waived.

PORTFOLIO AT A GLANCE
                            11/30/98          5/31/98
NUMBER OF SECURITIES          103               103
WEIGHTED AVERAGE
  MATURITY                  34 DAYS           55 DAYS
EXPENSE RATIO               0.17%*            0.04%*

* American Century Investment Management, Inc. voluntarily waived its management
  fee from August 1, 1997,  through July 31, 1998. In absence of the waiver, the
  fund's  expense ratio would have been 0.50% for the six months ended  November
  30, 1998 and 0.52% for the year ended May 31, 1998.

YIELDS AS OF NOVEMBER 30, 1998

7-DAY CURRENT YIELD
                              2.97%
7-DAY EFFECTIVE YIELD
                              3.01%
7-DAY TAX-EQUIVALENT YIELDS
  28.0% TAX BRACKET           4.13%
  31.0% TAX BRACKET           4.30%
  36.0% TAX BRACKET           4.64%
  39.6% TAX BRACKET           4.92%

Yields  would  have  been  2.87%,   2.91%,   4.03%,  4.20%,  4.54%,  and  4.82%,
respectively, if management fees had not been waived.

Past performance does not guarantee future results.

Money market funds are neither  insured nor  guaranteed by the FDIC or any other
government agency.

Yields will fluctuate, and although the fund seeks to preserve the value of your
investment  at $1 per share,  it is possible to lose money by  investing  in the
fund. The 7-day yield more closely reflects  earnings of the fund than the total
return.


4      1-800-345-2021


Tax-Free Money Market--Q&A
- --------------------------------------------------------------------------------
/photo of Bryan Karcher/

     An interview with Bryan Karcher,  a portfolio manager on the Tax-Free Money
Market investment team.

HOW DID TAX-FREE  MONEY MARKET  PERFORM DURING THE SIX MONTHS ENDED NOVEMBER 30,
1998?

     Tax-Free  Money  Market  continued  to  provide a higher  level of  federal
tax-exempt  income than the average tax-free money market fund. The fund's total
return was 1.68%,  compared with the 1.43% average return of the 133 "Tax-Exempt
Money  Market  Funds"  tracked  by  Lipper  Inc.   (formerly  Lipper  Analytical
Services). This performance put Tax-Free Money Market in the top 2% of the funds
in its Lipper  category.  In addition,  Lipper ranked the fund number one out of
the 133 funds in its category for the 12 months ended  November 30.  During that
period,  Tax-Free Money Market's total return was 3.56%, compared with 2.96% for
the Lipper average.  (See the Total Returns table on the previous page for other
fund performance comparisons.)

WHY DID TAX-FREE MONEY MARKET PERFORM SO WELL?

     A major  reason was a  promotional  program in which we  completely  waived
management  expenses from August 1, 1997, to July 31, 1998, and partially waived
expenses  from August 1, 1998,  to November  30,  1998.  We started  reinstating
expenses  in August  1998 at a rate of 10 basis  points  (0.10% --a basis  point
equals 0.01%) per month. By December, the fund reached its full expense ratio of
50 basis points.

HOW DOES THE FUND'S FULL EXPENSE RATIO COMPARE WITH THE EXPENSE  RATIOS OF OTHER
TAX-FREE MONEY MARKET FUNDS?

     Very favorably.  Even without the expense  waiver,  Tax-Free Money Market's
expenses  are lower than  approximately  75% of  tax-free  money  market  funds,
according to Lipper.

YOUR RELATIVE PERFORMANCE WAS STRONG, BUT THE FUND'S YIELD DECLINED. WHY?

     The current  yield  declined  from 3.90% on May 31 to 2.97% on November 30,
due partly to the reinstatement of expenses,  but also due to an overall decline
in interest rates.  Interest rates tend to fall when the economy weakens --lower
interest  rates help  stimulate  growth.  When it appeared the U.S.  economy was
heading for  recession as a result of economic and financial  turmoil  overseas,
the Federal  Reserve (the Fed), the U.S.  central bank, cut short-term  interest
rates three times between late September and  mid-November.  The yields on money
market securities declined in anticipation of the Fed's actions.

HOW DID THE FED'S ACTIONS INFLUENCE YOUR MANAGEMENT OF THE FUND?

     The Fed's rate cuts caused us to extend  Tax-Free Money  Market's  weighted
average maturity (WAM) in September.  When the Fed starts cutting rates and more
cuts are  anticipated,  we want to lock in the highest  possible  yields for the
longest period of time. To do this, we typically buy longer-term

[right margin]

"TAX-FREE MONEY MARKET CONTINUED TO PROVIDE A HIGHER LEVEL OF FEDERAL
TAX-EXEMPT INCOME THAN THE AVERAGE TAX-FREE MONEY MARKET FUND."

PORTFOLIO COMPOSITION BY SECURITY TYPE

AS OF NOVEMBER 30, 1998
VRDNs                 82%
Put Bonds              9%
Bonds 
 less than 1 Year      7%
Municipal Notes        2%

AS OF MAY 31, 1998
VRDNs                 82%
Other                  3%
Bonds 
 less than 1 Year     12%
Municipal Notes        2%
Commercial Paper       1%

Security types are defined on page 20.


                                                  www.americancentury.com      5


Tax-Free Money Market--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

securities.  Fortunately,  longer-term muni money market  securities were priced
attractively  in September.  That's  because many  corporations  sold  municipal
securities to make corporate tax payments on September 15, increasing supply and
reducing demand.

     We determine the relative  attractiveness  of one-year  munis by looking at
their yields in relation to Treasury  yields.  During  September,  one-year muni
yields as a percentage  of one-year  Treasury  yields  climbed from about 67% to
75%. We consider  anything  above 70%  attractive.  With one-year muni yields at
such a relatively  high level,  we bought one-year munis and extended the fund's
WAM by about 10 days at the end of September.

TAX-FREE  MONEY  MARKET'S WAM FELL FROM 55 DAYS ON MAY 31 TO 34 DAYS ON NOVEMBER
30 EVEN THOUGH YOU EXTENDED THE WAM DURING SEPTEMBER. WHY?

     Focusing on the WAM's decline during that period is a little misleading. We
often  increase our holdings of  longer-term  securities in April and May, which
significantly   boosts  the  May  31  WAM.   That's  when  one-year   munis  are
competitively  priced--shareholders are withdrawing money from muni money market
funds to pay their income taxes,  which  reduces  demand (and prices) and boosts
supply (and yields).

     After tax season, we didn't make significant additional long-term purchases
until early fall. If we don't purchase notes for a while, the portfolio's  notes
steadily decline in maturity ("roll down"), and the WAM declines.

WHAT STEPS HAVE YOU TAKEN TO KEEP TAX-FREE MONEY MARKET'S CREDIT QUALITY HIGH?

     We continue to be very conservative, more so than the SEC requires in terms
of the credit  quality of the fund's  holdings.  We are very careful to purchase
securities that are backed by strong  financial  institutions.  As a result,  we
haven't owned Japanese bank-backed paper since December 1997.  Furthermore,  our
credit analysis team is now carefully  evaluating  European banks, many of which
may not be prepared for the year 2000 computer problem.

WHAT IS YOUR OUTLOOK FOR SHORT-TERM INTEREST RATES AND FUND STRATEGY?

     The U.S. economy remains  vulnerable to financial  events overseas,  but it
also was bolstered by the Fed's  interest  rate cuts.  Consumer  confidence  and
spending  remain  strong,  but they're being offset by weakness in the corporate
and manufacturing sectors. The Fed may need time to evaluate these mixed signals
and the results of its rate cuts in 1998. Therefore, we expect the Fed to take a
"wait-and-see"  approach to interest rate policy,  with no  additional  interest
rate cuts for a while.  This argues for greater interest rate stability in early
1999, barring any cataclysmic events.

     We'll continue to emphasize  conservative  credit  standards.  In addition,
we'll attempt to maintain a competitive yield by monitoring supply and demand in
the marketplace and the yield relationships  between  variable-rate demand notes
(VRDNs), six-month munis, one-year munis, and comparable-maturity Treasurys.

[left margin]

"WE ARE VERY CAREFUL TO PURCHASE SECURITIES THAT ARE BACKED BY STRONG FINANCIAL
INSTITUTIONS."

PORTFOLIO COMPOSITION BY CREDIT RATING
                % OF FUND INVESTMENTS
               AS OF             AS OF
             11/30/98           5/31/98
SP1+            82%               86%
SP1             18%               11%
SP2             --                3%

SP1+ and SP1 are  Standard  &  Poor's  highest  credit  ratings  for  short-term
municipal  securities.  See  Credit  Rating  Guidelines  on  page  19  for  more
information.


6      1-800-345-2021


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
SHORT-TERM MUNICIPAL SECURITIES
ALASKA--1.4%
             $  1,345,000  Anchorage GO, Series 1997 A,
                              4.50%, 12/1/98 (FGIC)                $  1,344,998
                4,350,000  North Slope Boro, Series 1994 B,
                              6.10%, 6/30/99 (FSA)                    4,422,578
                                                                   -------------
                                                                      5,767,576
                                                                   -------------
ARKANSAS--1.0%
                4,100,000  Pine Bluff Industrial Development
                              Rev., (Camden Wire Co., Inc.),
                              VRDN, 3.15%, 12/3/98 (LOC:
                              Chase Manhattan Bank)
                              (Acquired 7/31/97-9/2/98,
                              Cost $4,100,000)(1)                     4,100,000
                                                                   -------------
CALIFORNIA--2.3%
                5,500,000  California Higher Education Loan
                              Auth. Student Loan Rev.,
                              Series 1995 E-5, VRDN,
                              3.80%, 6/1/99 (LOC: Student
                              Loan Marketing)                         5,500,000
                4,000,000  Rialto Public Financing Auth. Tax
                              Allocation, Series 1998 A, 
                              (Agua Mansa & Industrial), VRDN, 
                              3.70%, 12/3/98 (LOC:
                              Union Bank of California, N.A.)         4,000,000
                                                                   -------------
                                                                      9,500,000
                                                                   -------------
COLORADO--3.8%
                2,000,000  Arapahoe County Industrial
                              Development Rev., (Denver
                              Jetcenter), VRDN, 3.40%,
                              12/1/98 (LOC: U.S. Bank,
                              N.A.)                                   2,000,000
                3,500,000  Denver Multifamily Housing Rev.,
                              Series 1989 A, (Cottonwood
                              Creek), VRDN, 3.45%,
                              12/1/98 (LOC: General
                              Electric Capital Corp.)                 3,500,000
                5,000,000  Jefferson County School District
                              No. R-001 Tax Anticipation
                              Notes, 4.00%, 6/30/99                   5,024,063
                4,000,000  Lowry Economic Redevelopment
                              Auth. Rev., Series 1998 B,
                              VRDN, 3.15%, 12/2/98 (LOC:
                              Canadian Imperial Bank of
                              Commerce)                               4,000,000
                1,555,000  SBC Metropolitan GO, 3.65%,
                              12/1/98 (LOC: U.S. Bank,
                              N.A.)(2)                                1,555,000
                                                                   -------------
                                                                     16,079,063
                                                                   -------------

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
FLORIDA--24.1%
             $  1,000,000  Broward County Housing Finance
                              Auth. Multifamily Housing Rev.,
                              (Margate Investments), VRDN,
                              3.15%, 12/2/98 (LOC: Bank
                              One, Texas, N.A.)                    $  1,000,000
                2,500,000  Broward County Housing Finance
                              Auth. Multifamily Housing Rev.,
                              (Welleby Apartments), VRDN,
                              3.10%, 12/2/98 (LOC: Bank
                              of America N.T. & S.A.)                 2,500,000
                7,960,000  Broward County Housing Finance
                              Auth. Multifamily Housing Rev.,
                              Series 1990 A, (Palm
                              Aire-Oxford), VRDN, 3.25%,
                              12/2/98 (Guaranteed:
                              Continental Casualty Co.)               7,960,000
                4,010,000  Dade County Special Obligation
                              Trust Receipts, Series
                              1998 C-2, VRDN, 3.65%,
                              12/2/98 (LOC: Bank of
                              America N.T. & S.A.) (Acquired
                              7/9/98, Cost $4,010,000)(1)             4,010,000
                3,000,000  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., VRDN, 3.35%,
                              12/3/98 (Liquidity: Merrill
                              Lynch & Co., Inc.) (Acquired
                              5/19/98, Cost $3,000,000)(1)            3,000,000
                3,600,000  Eustis Multipurpose Rev.,
                              Series 1997 A, (Installment),
                              VRDN, 3.20%, 12/2/98 (LOC:
                              Suntrust Bank Central Florida,
                              N.A.) (Acquired 3/26/98,
                              Cost $3,600,000)(1)                     3,600,000
                3,000,000  Florida Housing Finance Agency
                              Rev., (Carlton Arms), VRDN,
                              3.20%, 12/2/98 (LOC: KBC
                              Bank and Insurance Holding)             3,000,000
                3,500,000  Florida Housing Finance Agency
                              Rev., (Country Club), VRDN, 
                              3.20%, 12/1/98 (LOC:
                              Northern Trust Company)                 3,500,000
                8,000,000  Florida Housing Finance Agency
                              Rev., (Woodlands), VRDN, 
                              3.50%, 12/2/98 (LOC:
                              Northern Trust Company)                 8,000,000
                5,190,000  Florida Housing Finance Agency
                              Rev., Series 1989 E, VRDN, 
                              3.25%, 12/2/98 (LOC:
                              Comerica Bank)                          5,190,000
                3,965,000  Florida Housing Finance Agency
                              Rev., Series 1990 B,
                              (Beville-Oxford), VRDN, 3.25%,
                              12/2/98 (SBBPA: Continental
                              Casualty Co.)                           3,965,000
                2,900,000  Florida Housing Finance Corp.
                              Rev.,  Series  1998 E, 
                              (Club at Vero  Apartments),
                              VRDN, 3.25%, 12/2/98 (LOC:
                              Nationsbank, N.A.)                      2,900,000

See Notes to Financial Statements


                                                  www.americancentury.com      7


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
            $  7,000,000   Florida Housing Finance Corp.
                              Rev., Series 1998-6,
                              (Homeowner Mortgage), 3.80%,
                              6/15/99 (GIC: FGIC Capital
                              Markets)                             $  7,000,000
                4,900,000  Highlands County Health Facilities
                              Auth. Rev., Series 1997 A,
                              (Adventist Health System),
                              VRDN, 3.20%, 12/3/98 (LOC:
                              Suntrust Bank Central Florida,
                              N.A.)                                   4,900,000
                1,000,000  Jacksonville Electric Auth. Rev.,
                              VRDN, 3.23%, 12/2/98
                              (SBBPA: Societe Generale)
                              (Acquired 4/24/98, Cost
                              $1,000,000)(1)                          1,000,000
                2,995,000  Jacksonville Electric Auth. Rev.,
                              VRDN, 3.30%, 12/3/98
                              (Liquidity: Merrill Lynch & Co.,
                              Inc.) (Acquired 4/24/98, Cost
                              $2,995,000)(1)                          2,995,000
                  700,000  Marion County Housing Finance
                              Auth. Multifamily Rev.,
                              Series 1985 D, (Summer Trace
                              Apartments), VRDN, 3.15%,
                              12/3/98 (LOC: Suntrust Bank,
                              Atlanta, GA)                              700,000
                  500,000  Martin County Pollution Control
                              Rev., (Florida Power & Light
                              Co.), VRDN, 3.35%, 12/1/98                500,000
                5,000,000  Orange County Educational
                              Facilities Auth. Rev., (Rollins
                              College), VRDN, 3.20%,
                              12/2/98 (LOC: NationsBank,
                              N.A.)                                   5,000,000
                7,200,000  Orange County Housing Finance 
                              Auth. Multifamily
                              Rev., Series 1992 A, 
                              (Smokewood/Sun), VRDN, 3.10%,
                              12/3/98 (LOC:
                              Citibank, N.A.)                         7,200,000
                7,200,000  Palm Beach County Educational
                              Facilities Auth. Rev., (Atlantic
                              College), VRDN, 3.25%,
                              12/3/98 (LOC: Nationsbank,
                              N.A.) (Acquired
                              3/18/98-6/11/98, Cost
                              $7,200,000)(1)                          7,200,000
                3,500,000  Palm Beach County Educational
                              Facilities Auth. Rev., (Lynn
                              University), VRDN, 3.40%,
                              12/2/98 (LOC: First Union
                              National Bank, Charlotte, NC)           3,500,000
                2,000,000  Pasco County School Board
                              COP, VRDN, 3.15%, 12/3/98
                              (AMBAC) (SBBPA: Landesbank
                              Hessen-Thuringen Girozentrale)          2,000,000
                1,600,000  Port St. Lucie Utility Rev., VRDN,
                              3.30%, 12/3/98 (MBIA)
                              (Liquidity: Merrill Lynch & Co.,
                              Inc.) (Acquired 5/21/98, Cost
                              $1,600,000)(1)                          1,600,000

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
             $  4,430,000  Seminole County School Board
                              COP, VRDN, 3.30%, 12/3/98
                              (AMBAC) (SBBPA: Merrill
                              Lynch & Co., Inc.) (Acquired
                              4/9/98, Cost $4,430,000)(1)          $  4,430,000
                4,690,000  Tallahassee-Leon County Civic
                              Center Auth. Capital
                              Improvement Rev.,
                              Series 1998 A, VRDN, 3.20%,
                              12/2/98 (LOC: Suntrust Bank
                              Central Florida N.A.)                   4,690,000
                                                                   -------------
                                                                    101,340,000
                                                                   -------------
GEORGIA--4.6%
                7,750,000  Clayton County Hospital Auth.
                              Rev. Anticipation Certificates,
                              Series 1998 B, (Southern
                              Regional Medical Center),
                              VRDN, 3.20%, 12/2/98 (LOC:
                              Suntrust Bank, Atlanta, GA)             7,750,000
                1,800,000  Cobb County Multifamily Housing
                              Rev., (Terrell Mill), VRDN, 3.40%,
                              12/2/98 (LOC: General
                              Electric Capital Corp.) (Acquired
                              5/1/96, Cost $1,800,000)(1)             1,800,000
                1,000,000  Forsyth County Industrial
                              Development Auth. Rev., (World
                              Access Inc.), VRDN, 3.35%,
                              12/3/98 (LOC:  Bank Austria
                              AG) (Acquired 9/2/98, Cost
                              $1,000,000)(1)                          1,000,000
                3,500,000  Fulton County Development Auth.
                              Rev., (Holy Innocents School),
                              VRDN, 3.20%, 12/2/98 (LOC:
                              Suntrust Bank, Atlanta, GA)
                              (Acquired 2/9/98-2/25/98,
                              Cost $3,500,000)(1)                     3,500,000
                5,300,000  Thomasville Hospital Auth. Rev.,
                              (Antic Certificates-J.D. Archbold),
                              VRDN, 3.20%, 12/2/98 (LOC:
                              Suntrust Bank, Atlanta, GA)
                              (Acquired 12/11/97-3/6/98,
                              Cost $5,300,000)(1)(3)                  5,300,000
                                                                   -------------
                                                                     19,350,000
                                                                   -------------
HAWAII--0.9%
                3,800,000  Hawaii Housing Finance and
                              Development Corp. Rev.,
                              Series 1993 A, (Affordable
                              Rental Housing), VRDN, 3.15%,
                              12/2/98 (LOC: Banque
                              Nationale de Paris S.A.)                3,800,000
                                                                   -------------
ILLINOIS--6.6%
                1,625,000  Bartlett Multifamily Housing Rev.,
                              Series 1995 A, (Bartlett Square
                              Apartments), VRDN, 3.20%,
                              12/3/98 (LOC: LaSalle
                              National Bank)                          1,625,000

                                              See Notes to Financial Statements


8      1-800-345-2021


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
             $  3,750,000  Illinois Development Financing
                              Auth. Rev., Series 1998 A,
                              (Provena Health), 4.50%,
                              5/15/99 (MBIA)                       $  3,759,485
                2,000,000  Illinois Health Facilities Auth. Rev.,
                              Series 1996 B, (Franciscan
                              Eldercare), VRDN, 3.20%,
                              12/2/98 (LOC: LaSalle
                              National Bank)                          2,000,000
                9,900,000  Illinois Health Facilities Auth. Rev.,
                              Series 1998 A, (Swedish  
                              Covenant), VRDN, 3.20%,
                              12/2/98 (AMBAC) (SBBPA:
                              First National Bank of Chicago)         9,900,000
                5,295,000  Illinois Industrial Development
                              Financing Auth. Rev.,
                              (Continental/Midland), VRDN,
                              3.35%, 12/3/98 (LOC: LaSalle
                              National Bank) (Acquired
                              5/8/98-6/25/98, Cost
                              $5,295,000)(1)                          5,295,000
                2,000,000  McCook Rev., Series 1996 B, (St.
                              Andrew Society), VRDN, 3.25%,
                              12/3/98 (LOC: Northern Trust
                              Company)                                2,000,000
                3,000,000  Schaumburg Multifamily Housing
                              Rev., (Windsong Apartments),  
                              VRDN, 3.28%, 12/3/98 (LOC:
                              LaSalle National Bank)                  3,000,000
                                                                   -------------
                                                                     27,579,485
                                                                   -------------
INDIANA--0.6%
                  580,000  Delphi Community Multibuilding
                              Corp. Rev., (First Mortgage),
                              3.60%, 1/5/99 (AMBAC)                     580,000
                1,000,000  Gary Industrial Development Rev.,
                              (Tinplate Partners International,
                              Inc.), VRDN, 3.35%, 12/3/98
                              (LOC: LaSalle National Bank)            1,000,000
                  960,000  Vincennes University Rev.,
                              Series 1997 E, (Student Fee),
                              3.95%, 12/1/98 (AMBAC)                    960,000
                                                                   -------------
                                                                      2,540,000
                                                                   -------------
IOWA--3.2%
               10,000,000  Iowa Finance Auth.  Rev.,  
                              Series 1998 A, (Wheaton
                              Franciscan), VRDN, 3.20%, 
                              12/2/98 (MBIA) (SBBPA:
                              Toronto-Dominion Bank)                 10,000,000
                3,300,000  Iowa School Cash Anticipation
                              Program Warrants,
                              Series 1998 B, (Corp. Warrants
                              Certificates), 4.25%, 1/28/99
                              (FSA)                                   3,303,543
                                                                   -------------
                                                                     13,303,543
                                                                   -------------

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
KENTUCKY--8.3%
             $  2,200,000  Kenton County Airport Board Rev.,
                              VRDN, 3.40%, 12/3/98
                              (Liquidity: Merrill Lynch & Co.,
                              Inc.) (MBIA) (Acquired 2/5/98,
                              Cost $2,200,000)(1)                  $  2,200,000
               17,000,000  Kentucky Economic Development
                              Finance Auth. Rev., (Pooled
                              Hospital Loan Program), VRDN,
                              3.35%, 12/2/98 (Capital
                              Reinsurance Company) (SBBPA:
                              Chase Manhattan Bank)                  17,000,000
               13,400,000  Kentucky Turnpike Auth. Resource
                              Recovery Road Floating Rate
                              Trust Receipts, Series 1997-17,
                              3.45%, 12/2/98 (FSA)
                              (SBBPA: Commerzbank A.G.)
                              (Acquired 10/8/97-1/15/98,
                              Cost $13,400,000)(1)                   13,400,000
                2,400,000  Mayfield Multi-City Lease Rev.,
                              VRDN, 3.25%, 12/2/98
                              (LOC: PNC Bank)                         2,400,000
                                                                   -------------
                                                                     35,000,000
                                                                   -------------
LOUISIANA--2.5%
                1,500,000  Jefferson Parish Home Mortgage
                              Rev., Series 1998 C-2,
                              (Mortgage-Backed Securities),
                              3.625%, 9/1/99                          1,500,000
                9,000,000  South Louisiana Port 
                              Commission  Rev.,  (Holnam
                              Inc.), VRDN, 3.25%, 12/2/98 (LOC:
                              Wachovia Bank, N.A.)                    9,000,000
                                                                   -------------
                                                                     10,500,000
                                                                   -------------
MARYLAND--1.0%
                3,000,000  Maryland Health and Higher
                              Educational Facilities Auth. Rev.,
                              Series 1998 A, (Charlestown
                              Community), VRDN, 3.25%,
                              12/2/98 (LOC: First Union
                              National Bank, Charlotte, NC)           3,000,000
                1,345,000  Prince Georges County COP,
                              Series 1998 A, (Equipment
                              Acquisition Program), 3.50%,
                              11/1/99 (MBIA)                          1,348,007
                                                                   -------------
                                                                      4,348,007
                                                                   -------------
MASSACHUSETTS--0.6%
                2,400,000  Lynn Water and Sewer
                              Commission General Rev.,
                              VRDN, 3.25%, 12/3/98 (FSA)
                              (Liquidity: Merrill Lynch & Co.,
                              Inc.) (Acquired 12/4/97, Cost
                              $2,400,000)(1)                          2,400,000
                                                                   -------------

See Notes to Financial Statements


                                                  www.americancentury.com      9


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
MISSOURI--3.0%
             $    800,000  Clay County Public Building Auth.
                              Leasehold Rev. COP,
                              Series 1998 A, 4.05%,
                              5/15/99 (FSA)                         $   800,000
                  515,000  Clay County Public Building Auth.
                              Leasehold Rev. COP,
                              Series 1998 B, (Jail Expansion
                              and Renovation), 4.05%,
                              5/15/99 (FSA)                             515,000
                2,350,000  Fenton Industrial Development
                              Auth. Rev., (Clayton Corp.),
                              VRDN, 3.50%, 12/3/98 (LOC:
                              Commerce Bank, N.A.)                    2,350,000
                2,090,000  Missouri Development Finance
                              Board Industrial Development
                              Rev., (J & J Enterprises), VRDN,
                              3.70%, 12/2/98 (LOC:
                              Commerce Bank, N.A.)                    2,090,000
                6,000,000  Missouri Health and Educational
                              Facilities Auth. Rev., (Pembroke
                              Hill School), VRDN, 3.30%,
                              12/3/98 (LOC: Commerce
                              Bank, N.A.)                             6,000,000
                1,065,000  Missouri Housing Development 
                              Commission Mortgage
                              Rev., Series 1998 C, 
                              (Single Family), VRDN, 3.90%,
                              4/1/99 (GIC:
                              FGIC Capital Markets)                   1,065,000
                                                                   -------------
                                                                     12,820,000
                                                                   -------------
NEVADA--1.4%
                6,000,000  ABN Amro Munitops Certificates
                              Trust, Series 1998-1, VRDN,
                              3.45%, 12/2/98 (MBIA)
                              (SBBPA: ABN Amro Bank N.V.)
                              (Acquired 6/3/98, Cost
                              $6,000,000)(1)                          6,000,000
                                                                   -------------
NEW JERSEY--0.2%
                1,015,000  Atlantic County Utilities Auth.
                              Sewer Rev., 3.70%, 1/15/99
                              (AMBAC)                                 1,015,000
                                                                   -------------
NEW MEXICO--3.2%
                6,160,600  New Mexico Finance Auth. Rev.,
                              Series 1997 A, (Administrative
                              Fee-Trims), VRDN, 3.25%,
                              12/2/98 (LOC: Canadian
                              Imperial Bank of Commerce)              6,160,600
                7,300,000  Sante Fe Gross Receipts Tax Rev.,
                              Series 1997 B, (Wastewater
                              System), VRDN, 3.25%,
                              12/2/98 (LOC: Canadian
                              Imperial Bank of Commerce)              7,300,000
                                                                   -------------
                                                                     13,460,600
                                                                   -------------

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
NORTH CAROLINA--0.7%
             $  3,000,000  Columbus County Industrial
                              Facilities & Pollution Control
                              Financing Auth. Rev.,
                              (Conflandey), VRDN, 3.35%,
                              12/3/98 (LOC: Banque
                              Nationale de Paris S.A.)
                              (Acquired 8/10/98, Cost
                              $3,000,000)(1)                       $  3,000,000
                                                                   -------------
NORTH DAKOTA--0.4%
                1,655,000  Hebron Industrial Development
                              Rev., (Dacco Inc.), VRDN,
                              3.45%, 12/3/98 (LOC: U.S.
                              Bank, N.A.) (Acquired 2/26/98,
                              Cost $1,655,000)(1)                     1,655,000
                                                                   -------------
OHIO--1.3%
                  700,000  Cleveland Waterworks Rev.,
                              Series 1996 H, (First Mortgage),
                              4.45%, 1/1/99 (MBIA)                      700,311
                4,610,000  Ohio Housing Finance Agency 
                              Mortgage Rev.,  Series
                              1998 A-3, 3.80%, 3/1/99 (GNMA)          4,610,000
                                                                   -------------
                                                                      5,310,311
                                                                   -------------
OREGON--3.4%
               10,400,000  Klamath Falls Electric Rev.,
                              Series 1986 E, (Salt Caves
                              Hydroelectric), 3.80%, 5/3/99(4)       10,400,000
                4,000,000  Oregon Health, Housing,
                              Educational and Cultural
                              Facilities Auth. Rev., (Quatama
                              Crossing), VRDN, 3.10%,
                              12/3/98 (LOC: U.S. Bank, N.A.)          4,000,000
                                                                   -------------
                                                                     14,400,000
                                                                   -------------
PENNSYLVANIA--5.2%
                6,000,000  Dauphin County General Auth.
                              Rev., Series 1997 A, VRDN,
                              3.30%, 12/2/98 (FSA)
                              (SBBPA: Credit Suisse First
                              Boston)                                 6,000,000
                7,495,000  Delaware Valley Regional Finance
                              Auth. Local Government Rev.,
                              VRDN, 3.25%, 12/3/98
                              (AMBAC) (SBBPA:  Merrill
                              Lynch & Co., Inc.) (Acquired
                              2/6/98, Cost $7,495,000)(1)             7,495,000
                3,240,000  Pennsylvania State University Rev.,
                              3.75%, 1/14/99 (LOC:
                              Rabobank Nederland) (Acquired
                              1/29/98, Cost $3,240,000)(1)            3,240,000
                5,305,000  Washington County Auth. Lease
                              Rev., (Higher Education Pooled
                              Equipment Lease), VRDN,
                              3.25%, 12/2/98 (LOC: First
                              Union National Bank, Charlotte,
                              NC)                                     5,305,000
                                                                   -------------
                                                                     22,040,000
                                                                   -------------

                                              See Notes to Financial Statements


10      1-800-345-2021


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
SOUTH CAROLINA--0.5%
               $2,215,000  Clemson University Rev.,
                              Series 1998 A, 4.50%, 5/1/99
                              (AMBAC)                              $  2,226,689
                                                                   -------------
SOUTH DAKOTA--1.1%
                1,500,000  South Dakota Health &
                              Educational Facilities Auth. Rev.,
                              (Avera McKennan Issue), 4.00%,
                              7/1/99 (MBIA)                           1,502,510
                3,000,000  South Dakota Housing
                              Development Auth. Rev.,
                              Series 1998 C,
                              (Homeownership Mortgage),
                              3.75%, 8/5/99                           3,000,000
                                                                   -------------
                                                                      4,502,510
                                                                   -------------
TENNESSEE--5.7%
                2,000,000  Chattanooga Industrial
                              Development Board Rev.,
                              (Market State Limited), VRDN,
                              3.25%, 12/2/98 (LOC: Credit
                              Suisse First Boston, Inc.)              2,000,000
                8,190,000  Clarksville Public Building Auth.
                              Rev., (Tennessee Municipal
                              Bond Fund), VRDN, 3.20%,
                              12/3/98 (LOC: Nationsbank,
                              N.A.) (Acquired 6/25/98, Cost
                              $8,190,000)(1)                          8,190,000
                5,000,000  Dickson County Industrial
                              Development Board Rev.,
                              (Renaissance Learning Center),
                              VRDN, 3.20%, 12/2/98 (LOC:
                              Suntrust Bank, Nashville, N.A.)
                              (Acquired 12/19/97, Cost
                              $5,000,000)(1)                          5,000,000
                4,600,000  Memphis-Shelby County Industrial
                              Development Board Exempt
                              Facilities Rev., (Ponderosa Fibres
                              of America), VRDN, 3.30%,
                              12/3/98 (LOC: Nationsbank,
                              N.A.) (Acquired 2/19/98, Cost
                              $4,600,000)(1)                          4,600,000
                4,000,000  Tullahoma Industrial Development
                              Board Rev., (Rock Tennessee
                              Converting Co.), VRDN, 3.30%,
                              12/2/98 (LOC: Sun Trust Bank,
                              Atlanta, N.A. ) (Acquired 1/5/98,
                              Cost $4,000,000)(1)                     4,000,000
                                                                   -------------
                                                                     23,790,000
                                                                   -------------
TEXAS--5.4%
                1,320,000  El Paso County GO, 5.00%,
                              2/15/99 (FGIC)                          1,323,046
                5,500,000  Gulf Coast Industrial Development
                              Auth. Rev., (Petrounited Term
                              Inc.), VRDN, 3.25%, 12/3/98
                              (LOC: Nationsbank, N.A.)                5,500,000

Principal Amount                                                        Value
- --------------------------------------------------------------------------------
               $4,495,000  Midland County Hospital District
                              Rev., VRDN, 3.30%, 12/3/98
                              (AMBAC) (Liquidity: Merrill
                              Lynch & Co., Inc.) (Acquired
                              11/20/97, Cost $4,495,000)(1)        $  4,495,000
                4,585,000  Nueces River Auth. Water Supply
                              Rev., VRDN, 3.30%, 12/3/98
                              (FSA) (Liquidity: Merrill Lynch &
                              Co., Inc.) (Acquired 12/4/97,
                              Cost $4,585,000)(1)                     4,585,000
                6,750,000  Tarrant County Health Facilities
                              Development Corporate Rev.,
                              (Carter Blood Care), VRDN,
                              3.30%, 12/3/98 (LOC: Chase
                              Manhattan Bank, Texas)                  6,750,000
                                                                   -------------
                                                                     22,653,046
                                                                   -------------
WASHINGTON--3.5%
                1,710,000  Pierce County Economic
                              Development Corporate Rev.,
                              (K & M Holdings II), VRDN,
                              3.55%, 12/2/98 (LOC: Wells
                              Fargo Bank, N.A.) (Acquired
                              11/17/97, Cost $1,710,000)(1)           1,710,000
                2,010,000  Washington Health Care Facilities
                              Auth. Rev., (Multicare Health
                              System), 4.00%, 8/15/99
                              (MBIA)                                  2,014,149
                2,200,000  Washington Public Power Supply
                              System Rev., (Nuclear Project
                              No. 1), 7.50%, 7/1/99,
                              Prerefunded at 102% of Par(4)           2,296,706
                2,075,000  Washington Public Power Supply
                              System Rev., Series 1989 A,
                              (Nuclear Project No. 1), 7.50%,
                              7/1/99, Prerefunded at 102%
                              of Par(4)                               2,166,208
                6,600,000  Washington State Housing
                              Finance Commission Multifamily
                              Mortgage Rev., (Mill Plain
                              Crossing), VRDN, 3.35%,
                              12/1/98 (LOC: Harris Trust &
                              Savings Bank)                           6,600,000
                                                                   -------------
                                                                     14,787,063
                                                                   -------------
WISCONSIN--4.1%
               15,500,000  Ladysmith Solid Waste Disposal
                              Facility Rev., (City Forest Corp.),
                              VRDN, 3.80%, 12/2/98 (LOC:
                              Union Bank of California, N.A.)        15,500,000
                1,700,000  Pleasant Prairie Industrial
                              Development Rev., (Muskie
                              Enterprises Inc.), VRDN, 3.30%,
                              12/3/98 (LOC: Harris Trust &
                              Savings Bank) (Acquired
                              1/9/97, Cost $1,700,000)(1)             1,700,000
                                                                   -------------
                                                                     17,200,000
                                                                   -------------
TOTAL INVESTMENT SECURITIES--100.0%                                $420,467,893
                                                                   =============

See Notes to Financial Statements


                                                 www.americancentury.com      11


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

COP = Certificates of Participation

FGIC = Financial Guaranty Insurance Co.

FSA = Financial Security Assurance Inc.

GIC = Guaranteed Investment Contract

GNMA = Government National Mortgage Association

GO = General Obligation

LOC = Letter of Credit

MBIA = MBIA Insurance Corp.

SBBPA = Standby Bond Purchase Agreement

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted  average  portfolio  maturity.  Rate shown is effective
November 30, 1998.

(1) Security was purchased under Rule 144A of the Securities Act of 1933 or is a
    private  placement  and,  unless  registered  under the Act or exempted from
    registration,  may only be sold to qualified  institutional  investors.  The
    aggregate  value  of  restricted   securities  at  November  30,  1998,  was
    $122,500,000,   which  represented  28.3%  of  net  assets.  None  of  these
    securities are considered to be illiquid.

(2) When-issued security.

(3) Security,  or a portion  thereof,  has been segregated at the custodian bank
    for when-issued securities.

(4) Escrowed  to  maturity  in U.S.  government  securities  or state  and local
    government securities.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the amortized cost of each investment

* the percentage of investments in each state

                                              See Notes to Financial Statements


12      1-800-345-2021


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

ASSETS
Investment securities, at value
  (amortized cost and cost for
  federal  income tax purposes) (Note 1) ..................         $420,467,893
Cash ......................................................           13,574,421
Receivable for investments sold ...........................            1,555,000
Interest receivable .......................................            2,550,417
                                                                    ------------
                                                                     438,147,731
                                                                    ------------
LIABILITIES
Disbursements in excess
  of demand deposit cash ..................................              483,151
Payable for investments purchased .........................            1,555,000
Payable for capital shares redeemed .......................            3,039,378
Accrued management fees (Note 2) ..........................              145,787
                                                                    ------------
                                                                       5,223,316
                                                                    ------------
Net Assets ................................................         $432,924,415
                                                                    ============
CAPITAL SHARES
Outstanding (unlimited number
  of shares authorized) ...................................          432,904,764
                                                                    ============
Net Asset Value Per Share .................................         $       1.00
                                                                    ============
NET ASSETS CONSIST OF:
Capital paid in ...........................................         $432,904,764
Accumulated undistributed net
  realized gain on investments ............................               19,651
                                                                    ------------
                                                                    $432,924,415
                                                                    ============

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of fund shares  outstanding  gives you the price of an individual  share, or the
net asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
investment income not yet paid to shareholders (if any); and net gains earned on
investment activity but not yet paid to shareholders or net losses on investment
activity (known as realized gains or losses). This breakdown tells you the value
of net assets that are performance-related,  such as investment gains or losses,
and the  value  of net  assets  that are not  related  to  performance,  such as
shareholder investments and redemptions.

See Notes to Financial Statements


                                                 www.americancentury.com      13


Statement of Operations
- --------------------------------------------------------------------------------

SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED)

INVESTMENT INCOME
Income:
Interest ...............................................            $ 8,171,871
                                                                    -----------
Expenses (Note 2):
Management fees ........................................              1,156,431
Trustee's fees and expenses ............................                  3,877
                                                                    -----------
Total expenses .........................................              1,160,308
Amount waived ..........................................               (771,286)
                                                                    -----------
  Net expenses .........................................                389,022
                                                                    -----------
Net investment income ..................................            $ 7,782,849
                                                                    ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

                                              See Notes to Financial Statements


14      1-800-345-2021


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED)  AND YEAR ENDED MAY 31, 1998

Increase (Decrease) in Net Assets
                                                  NOVEMBER 30,         MAY 31,
                                                     1998               1998
OPERATIONS
Net investment income ....................     $   7,782,849      $   8,931,358
Net realized gain on investments .........              --               19,651
                                               -------------      -------------
Net increase in net assets
   resulting from operations .............         7,782,849          8,951,009
                                               -------------      -------------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income ...............        (7,782,849)        (8,931,358)
                                               -------------      -------------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ................       349,200,231        786,813,923
Proceeds from reinvestment
  of distributions .......................         7,251,795          8,415,885
Payments for shares redeemed .............      (367,804,482)      (436,702,980)
                                               -------------      -------------
Net increase (decrease) in net
  assets from capital share
  transactions ...........................       (11,352,456)       358,526,828
                                               -------------      -------------
Net increase (decrease)
  in net assets ..........................       (11,352,456)       358,546,479

NET ASSETS
Beginning of period ......................       444,276,871         85,730,392
                                               -------------      -------------
End of period ............................     $ 432,924,415      $ 444,276,871
                                               =============      =============

TRANSACTIONS IN
SHARES OF THE FUND
Sold .....................................       349,200,231        786,813,923
Issued in reinvestment
  of distributions .......................         7,251,795          8,415,885
Redeemed .................................      (367,804,482)      (436,702,980)
                                               -------------      -------------
Net increase (decrease) ..................       (11,352,456)       358,526,828
                                               =============      =============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
  redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

See Notes to Financial Statements


                                                 www.americancentury.com      15


Notes to Financial Statements
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     Organization--American  Century  Municipal Trust (the Trust), is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company. American Century - Benham Tax-Free Money Market Fund (the Fund), is one
of the eight funds issued by the Trust.  The Fund is diversified  under the 1940
Act.  Its  objective  is to seek as high a level of current  income  exempt from
federal  income taxes as is consistent  with prudent  investment  management and
conservation  of  shareholders'  capital by investing  primarily  in  short-term
municipal  obligations.  The Fund may  concentrate  its  investments  in certain
states and  therefore  may have more  exposure to credit  risk  related to those
states than funds that have broader geographical diversification.  The following
significant  accounting  policies  are in  accordance  with  generally  accepted
accounting principles.

     Security  Valuations--Portfolio  securities  are valued at amortized  cost,
which  approximates  current  market  value.  When  valuations  are not  readily
available,  securities are valued at fair value as determined in accordance with
procedures adopted by the Board of Trustees.

     Security  Transactions--Security  transactions  are accounted for as of the
trade date. Net realized gains and losses are determined on the identified  cost
basis, which is also used for federal income tax purposes.

     Investment  Income--Interest  income is recorded  on the accrual  basis and
includes accretion of discounts and amortization of premiums.

     Income  Tax  Status--It  is the  policy of the Fund to  distribute  all net
investment  income  and  net  realized  capital  gains  to  shareholders  and to
otherwise qualify as a regulated  investment company under the provisions of the
Internal  Revenue Code.  Accordingly,  no provision has been made for federal or
state income taxes.

     Distributions to Shareholders--Distributions from net investment income are
declared and credited daily and distributed monthly. The Fund does not expect to
realize any long-term capital gains and accordingly,  does not expect to pay any
capital gain distributions.

     Additional Information--Funds Distributor, Inc. (FDI) is the Trust's
distributor. Certain officers of FDI are also officers of the Trust.


16      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

     The trust has entered into a Management  Agreement  with  American  Century
Investment  Management  Inc.  (ACIM)  that  provides  the Fund  with  investment
advisory and  management  services in exchange for a single  unified  management
fee.  Expenses  excluded  from the  agreement are  brokerage,  taxes,  portfolio
insurance,  interest, fees and expenses of those Trustees who are not considered
"interested persons" as defined in the Investment Company Act of 1940 (including
counsel fees) and extraordinary  expenses.  The annual rate at which this fee is
assessed is determined monthly in a two-step process: First, a fee rate schedule
is  applied  to the net  assets  of all of the  funds in the  Fund's  investment
category which are managed by ACIM (the "Investment  Category Fee"). The overall
investment objective of each Fund determines its Investment Category.  The three
investment  categories  are:  the  Money  Market  Fund  Category,  the Bond Fund
Category, and the Equity Fund Category. The Fund is included in the Money Market
Fund Category. Second, a separate fee rate schedule is applied to the net assets
of al of the funds managed by ACIM (the "Complex Fee"). The Investment  Category
Fee and the Complex Fee are then added to determine the unified  management  fee
rate.  The  management  fee is paid  monthly by the Fund based on its  aggregate
average  daily net assets  during the previous  month  multiplied by the monthly
management fee rate.

     The annualized Investment Category Fee schedule for the Fund is as follows

     0.2700% of the first $1 billion 
     0.2270% of the next $1 billion 
     0.1860% of the next $3 billion 
     0.1690% of the next $5 billion 
     0.1580% of the next $15 billion 
     0.1575% of the next $25 billion
     0.1570% of the average daily net assets over $50 billion

     The annualized Complex Fee schedule is as follows:

     0.3100% of the first $2.5 billion 
     0.3000% of the next $7.5 billion 
     0.2985% of the next $15 billion 
     0.2970% of the next $25 billion 
     0.2960% of the next $50 billion 
     0.2950% of the next $100 billion 
     0.2940% of the next $100 billion 
     0.2930% of the next $200 billion 
     0.2920% of the next $250 billion
     0.2910% of the next $500 billion
     0.2900% of the average daily net assets over $1,250 billion

     ACIM waived all expenses  through July 31, 1998.  Effective August 1, 1998,
ACIM began  decreasing the waiver by 0.10% of the Fund's net assets on a monthly
basis. The gradual expiration of the waiver will continue until December 1998.

     Certain  officers  and  trustees  of the  Trust  are also  officers  and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the Trust's  investment  manager,  ACIM, and the
Trust's transfer agent, American Century Service Corporation.


                                                 www.americancentury.com      17


Tax-Free Money Market--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
    FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31 (EXCEPT AS NOTED)

                                    1998(1)                1998              1997            1996          1995            1994
PER-SHARE DATA
Net Asset Value,
<S>                              <C>                   <C>                <C>            <C>            <C>            <C>        
Beginning of Period ..........   $      1.00           $      1.00        $      1.00    $      1.00    $      1.00    $      1.00
                                 -----------           -----------        -----------    -----------    -----------    -----------
Income From Investment
Operations
  Net Investment Income ......          0.02                  0.04               0.03           0.03           0.03           0.02
                                 -----------           -----------        -----------    -----------    -----------    -----------
Distributions
  From Net Investment Income .         (0.02)                (0.04)             (0.03)         (0.03)         (0.03)         (0.02)
                                 -----------           -----------        -----------    -----------    -----------    -----------
Net Asset Value, End of Period   $      1.00           $      1.00        $      1.00    $      1.00    $      1.00    $      1.00
                                 ===========           ===========        ===========    ===========    ===========    ===========
  Total Return(2) ............          1.68%                 3.70%              2.98%          3.19%          2.95%          1.92%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ........          0.17%(3)(4)           0.04%(4)           0.67%          0.65%          0.66%          0.67%
Ratio of Net Investment Income
to Average Net Assets ........          3.32%(3)(4)           3.68%(4)           2.93%          3.12%          2.88%          1.89%
Net Assets, End
of Period (in thousands) .....   $   432,924           $   444,277        $    85,730    $    91,118    $    92,034    $   109,818
</TABLE>

(1) Six months ended November 30, 1998 (unaudited).

(2) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total retunrs for periods less than one year are not
    annualized.

(3) Annualized

(4) ACIM has  voluntarily  waived its management fee from August 1, 1997 through
    July 31, 1998. In absence of the waiver,  the annualized  ratio of operating
    expenses to average net assets and annualized ratio of net investment income
    to average net assets would have been 0.50% and 3.65%, respectively, for the
    six months ended  November 30, 1998 and 0.52% and 3.20%,  respectively,  for
    the year ended May 31, 1998.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  statement itemizes current period
activity and  statistics and provides  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming
  reinvestment of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

                                              See Notes to Financial Statements


18      1-800-345-2021


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     The Benham Group offers 38  fixed-income  funds,  ranging from money market
funds to long-term bond funds and including  both taxable and tax-exempt  funds.
Each fund is  managed  to  provide  a "pure  play" on a  specific  sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's portfolio is tied to a specific  benchmark  index.  Fund managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

     In addition to these principles, each fund has its own investment policies:

     Tax-Free Money Market is a money market fund that seeks to provide interest
income  exempt from federal  income taxes by investing in  short-term  municipal
securities.

     Investments in Tax-Free Money Market are neither  insured nor guaranteed by
the FDIC or any other government agency. Yields will fluctuate, and although the
fund seeks to  preserve  the value of your  investment  at $1 per  share,  it is
possible to lose money by investing in the fund.

     Investment  income may be subject to  certain  state and local  taxes,  and
depending on your tax status, may be subject to the federal  alternative minimum
tax. Capital gains are not exempt from federal income tax.

LIPPER RANKINGS

     Lipper Inc. is an independent mutual fund ranking service that groups funds
according to their investment  objectives.  Rankings are based on average annual
returns for each fund in a given  category for the periods  indicated.  Rankings
are not included for periods less than one year.

     The Lipper category for the fund is:

     Tax-Exempt Money Market Funds--funds that intend to maintain a constant net
asset   value   and   invest  in   high-quality   municipal   obligations   with
dollar-weighted average maturities of less than 90 days.

CREDIT RATING GUIDELINES

     Credit  quality (the  issuer's  financial  strength and the  likelihood  of
timely  payment of  interest  and  principal)  is a key  factor in  fixed-income
investment  analysis.  Credit ratings issued by independent  rating and research
companies such as Standard & Poor's help quantify credit  quality--the  stronger
the issuer,  the higher the credit rating.  In turn,  credit quality and ratings
greatly influence the prices and yields of fixed-income securities--high ratings
mean higher prices and less current income (yield) as compensation for risk.

     But credit ratings are subjective.  They reflect the opinions of the rating
agencies that issue them and are not absolute standards of quality. Furthermore,
high credit ratings do not guarantee good  investment  performance.  They do not
reflect the price  stability  of a municipal  security  when  economic or market
conditions change.

INVESTMENT TEAM LEADERS
  PORTFOLIO MANAGER
     BRYAN KARCHER

MUNICIPAL CREDIT RESEARCH TEAM
  MANAGER
     STEVEN PERMUT
  MUNICIPAL CREDIT ANALYSTS
     DAVID MOORE
     ROBERT MILLER
     BILL MCCLINTOCK
     TIM BENHAM
     BRAD BODE


                                                 www.americancentury.com      19


Glossary
- --------------------------------------------------------------------------------

RETURNS

* Total  Return  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* Average Annual Returns  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on page 18.

YIELDS

* 7-Day  Current  Yield  is  calculated  based  on the  income  generated  by an
investment  in the fund over a seven-day  period and is  expressed  as an annual
percentage rate.

* 7-Day  Effective  Yield is  calculated  similarly,  although  this  figure  is
slightly  higher than the fund's 7-Day  Current  Yield because of the effects of
compounding.  The 7-Day  Effective  Yield  assumes  that income  earned from the
fund's investments is reinvested and generating additional income.

*  Tax-Equivalent  Yields show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

INVESTMENT TERMS

* Basis Point--a basis point equals one  one-hundredth of a percentage point (or
0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

PORTFOLIO STATISTICS

* Number of Securities--the  number of different  securities held by a fund on a
given date.

*  Weighted  Average  Maturity  (WAM)--a  measurement  of the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio mature, weighted by dollar amount.

* Expense Ratio--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

TYPES OF MUNICIPAL SECURITIES

* Municipal Commercial Paper (CP)--high-grade  short-term securities backed by a
line of credit from a bank.

* Municipal Notes--securities with maturities of two years or less.

* Put  Bonds--long-term  securities  that can be "put back" (i.e.,  sold at face
value) to a specified buyer at a prearranged date.

*  Variable-Rate  Demand Notes  (VRDNs)--securities  that track market  interest
rates and  stabilize  their  market  values  using  periodic  (daily or  weekly)
interest rate adjustments.


20      1-800-345-2021


[inside back cover]

AMERICAN CENTURY FUNDS
- -------------------------------------------------------------------------------

BENHAM GROUP(reg.sm)
TAXABLE BOND FUNDS
U.S. TREASURY & GOVERNMENT
   Short-Term Treasury
   Short-Term Government
   GNMA
   Intermediate-Term Treasury
   Long-Term Treasury
   Inflation-Adjusted Treasury
   Target Maturities Trust: 2000
   Target Maturities Trust: 2005
   Target Maturities Trust: 2010
   Target Maturities Trust: 2015
   Target Maturities Trust: 2020
   Target Maturities Trust: 2025
CORPORATE & DIVERSIFIED
   Limited-Term Bond
   Intermediate-Term Bond
   Bond
   Premium Bond
   High-Yield Bond
INTERNATIONAL
   International Bond

TAX-FREE & MUNICIPAL BOND FUNDS
MULTIPLE-STATE
   Limited-Term Tax-Free
   Intermediate-Term Tax-Free
   Long-Term Tax-Free
   High-Yield Municipal
SINGLE-STATE
   Arizona Intermediate-Term Municipal
   California High-Yield Municipal
   California Insured Tax-Free
   California Intermediate-Term Tax-Free
   California Limited-Term Tax-Free
   California Long-Term Tax-Free
   Florida Intermediate-Term Municipal

MONEY MARKET FUNDS
TAXABLE
   Capital Preservation
   Government Agency Money Market
   Premium Capital Reserve
   Premium Government Reserve
   Prime Money Market
TAX-FREE & MUNICIPAL
   California Municipal Money Market
   California Tax-Free Money Market
   Florida Municipal Money Market
   Tax-Free Money Market

AMERICAN CENTURY(reg.sm) GROUP
ASSET ALLOCATION
   Strategic Allocation: Conservative
   Strategic Allocation: Moderate
   Strategic Allocation: Aggressive
BALANCED
   Balanced
CONSERVATIVE EQUITY
   Income and Growth
   Equity Income
   Value
   Equity Growth
SPECIALTY
   Utilities
   Real Estate
   Global Natural Resources
   Global Gold
SMALL CAP
   Small Cap Quantitative
   Small Cap Value

TWENTIETH CENTURY GROUP
GROWTH
   Select
   Heritage Growth
   Ultra
AGGRESSIVE GROWTH
   Vista
   Giftrust
   New Opportunities
INTERNATIONAL GROWTH
   International Growth
   International Discovery
   Emerging Markets
GLOBAL
   Global Growth

Please call for a prospectus  or profile on any  American  Century  fund.  These
documents contain important information including charges and expenses,  and you
should read them carefully before you invest or send money.


[right margin]

[american century logo(reg.sm)]
American
Century

P.O. BOX 419200
KANSAS CITY, MISSOURI
64141-6200

INVESTOR SERVICES:
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE:
1-800-345-8765

TELECOMMUNICATIONS DEVICE FOR THE DEAF:
1-800-634-4113 OR 816-444-3485

FAX: 816-340-7962

INTERNET: WWW.AMERICANCENTURY.COM


AMERICAN CENTURY MUNICIPAL TRUST


INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI


THIS REPORT AND THE STATEMENTS IT CONTAINS  ARE SUBMITTED FOR THE GENERAL
INFORMATION  OF OUR SHAREHOLDERS. THE REPORT IS NOT  AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED  BY AN EFFECTIVE
PROSPECTUS.

FUNDS DISTRIBUTOR, INC.
(c) 1998 AMERICAN CENTURY SERVICES CORPORATION


[recycled logo]
Recycled


[back cover]


American Century Investments                                     BULK RATE
P.O. Box 419200                                              U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                   AMERICAN CENTURY
www.americancentury.com                                          COMPANIES



9901                                                    Funds Distributor, Inc.
SH-BKT-15062                      (c)1998 American Century Services Corporation
<PAGE>

[front cover]                                                 NOVEMBER 30, 1998

SEMIANNUAL REPORT
- ----------------
AMERICAN CENTURY

                              [graphic of stairs]

BENHAM GROUP
- ------------------------------------
LIMITED-TERM TAX-FREE
INTERMEDIATE-TERM TAX-FREE
LONG-TERM TAX-FREE
HIGH-YIELD MUNICIPAL

                                                 [american century logo(reg.sm)]
                                                                        American
                                                                         Century
[inside front cover]


AMERICAN CENTURY BROKERAGE
- --------------------------------------------------------------------------------

     We're pleased to introduce American Century's new brokerage service,  which
offers a wide range of investment options and features:

     *  FundChoice  Service--Invest  in over 8,000 no-load and load mutual funds
        from hundreds of different fund companies, many with no transaction fees

     *  Buy individual stocks and bonds

     *  24-hour  Internet and  automated  phone trades are just $24.95 for up to
        1,000 shares of stock, and 2 cents per share thereafter

     *  Strong research capability 

        *   Build and track model portfolios

        *   Get news, quotes and charts

        *   Check free Standard & Poor's stock reports

        *   Access Wall Street on Demand(tm),  a research service with more than
            500,000 reports on industry trends,  corporate earnings,  and mutual
            fund analysis

     *  Track your brokerage account on one easy-to-read statement

     *  Unlimited  check writing and a Gold  MasterCard(reg.tm)  ATM/debit  card
        with an American Century Brokerage Access AccountSM (minimum $10,000)

To talk with a Brokerage Associate, call 1-888-345-2071.

WHAT'S NEW . . .

    AMERICAN  CENTURY CATALOG OF TOOLS & SERVICES lists all the free educational
materials available to investors.

    We now have FOUR-PAGE  PROFILES of many of our funds.  The profiles follow a
standard SEC format and are intended to allow investors to compare funds easily.
You can request a profile or the full prospectus. Full prospectuses contain more
detailed fund information and you will continue to receive one after investing.

    In 1999, we will provide  SIMPLIFIED  PROSPECTUSES that highlight  important
information  about our funds,  including  fees and expenses.  More detailed data
will be in the Statement of Additional Information.

    To order any of these materials, please call 1-800-345-2021.

[left margin]

BENHAM GROUP
LIMITED-TERM TAX-FREE
(TWTSX)
- ----------------------------------
BENHAM GROUP
INTERMEDIATE-TERM TAX-FREE
(TWTIX)
- ----------------------------------
BENHAM GROUP
LONG-TERM TAX-FREE
(TWTLX)
- ----------------------------------
BENHAM GROUP
HIGH-YIELD MUNICIPAL
(ABHYX)


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     The six months  ended  November  30,  1998,  was an eventful  period in the
global financial markets.  Weakening economic and financial conditions,  brought
on by problems in Asia,  Russia,  and Latin America,  led to  significant  stock
market  volatility and a dramatic  decline in interest rates.  Volatility was so
rampant that the Federal Reserve, the U.S. central bank, cut short-term interest
rates three times to help stabilize markets worldwide.

     The  third  quarter  of  1998  served  as a good  example  of the  markets'
extremes.  Several major U.S. stock indices hit record highs in mid-July  before
plunging 20% in the following six weeks. In the bond market, high demand for the
safety of Treasury  bonds pushed  yields down to their lowest  levels ever,  but
demand for  corporate  bonds  thinned  to the point  where  trading  was all but
impossible.

     This type of investment environment particularly  demonstrates the benefits
of a well-diversified  investment  portfolio.  As we saw in the third quarter of
1998,  allocating  your assets among stocks,  bonds,  and money market funds can
help your  portfolio  weather  dramatic  changes in the  economic or  investment
climate.

     Municipal bond  performance fit between the extremes  provided by Treasurys
and  corporates.  Municipals  posted positive  returns,  though not as strong as
Treasurys, as interest rates fell.

     We're proud to report that  investors  who  diversified  with the  American
Century  Benham   Tax-Free  and  Municipal  funds  continued  to  receive  solid
investment  results--the  funds each  produced  better  returns and more federal
tax-free income than their Lipper category averages.

     Looking ahead, we've been watching carefully the preparation of the world's
computer  systems  for the  year  2000.  At  American  Century,  we're  devoting
substantial  resources to this endeavor.  Throughout  1999, our technology  team
will be  extensively  testing our systems,  including  those  involved with fund
performance and dividend payments.

     Thank you for your continued investment with American Century.

Sincerely,

/s/James E. Stowers, Jr.                 /s/James E. Stowers III
James E. Stowers, Jr.                    James E. Stowers III
Chairman of the Board and Founder        Chief Executive Officer


[right margin]

               Table of Contents
   Report Highlights ......    2
   Market Perspective .....    4
Limited-Term Tax-Free
   Performance Information     5
   Management Q&A .........    6
   Schedule of Investments     9
Intermediate-Term Tax-Free
   Performance Information    11
   Management Q&A .........   12
   Schedule of Investments    15
Long-Term Tax-Free
   Performance Information    20
   Management Q&A .........   21
   Schedule of Investments    24
High-Yield Municipal
   Performance Information    28
   Management Q&A .........   29
   Schedule of Investments    32
Financial Statements
   Statements of Assets and
   Liabilities ............   35
   Statements of Operations   36
   Statements of Changes
   in Net Assets ..........   37
   Notes to Financial
   Statements .............   39
   Financial Highlights ...   42
Other Information
   Background Information
      Investment Philosophy
      and Policies ........   46
      Comparative Indices .   46
      Lipper Rankings .....   46
      Credit Rating
      Guidelines ..........   46
      Investment and Credit
      Research Teams ......   46
   Glossary ...............   47


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   A sharp  decline in interest  rates helped  municipal  bonds  produce  solid
    returns for the six months ended November 30, 1998.

*   Rates fell because a series of economic crises around the globe threatened
    to slow the U.S. economy, and because inflation remained low.

*   In an  attempt  to boost  the  economy  and  restore  confidence  to  global
    financial  markets,  the U.S.  Federal Reserve lowered  short-term  interest
    rates three times from September to November.

*   Despite their gains,  municipal  bonds lagged  Treasury  securities.  That's
    because  the bond  market  rally was driven in part by demand  from  foreign
    investors, who don't benefit from municipals' tax advantages.

*   Meanwhile,  municipal  bond supply surged as many issuers  sought to lock in
    lower borrowing costs by refinancing older, higher-rate debt.

*   As a result of the Federal  Reserve's  interest rate cuts,  short-term rates
    fell faster than long-term  rates,  resulting in a steeper  municipal  yield
    curve.

LIMITED-TERM TAX-FREE

*   Limited-Term  Tax-Free  produced  higher  returns and more federal  tax-free
    income than the average  short/intermediate  municipal  fund,  according  to
    Lipper Inc.

*   We increased the portfolio's credit quality, selling some of our lower-rated
    bonds after they'd been upgraded and their prices rose.

*   We  lengthened  duration  slightly  over the last six months,  which  helped
    returns as interest rates declined.

*   The  portfolio's  yield  declined as  interest  rates fell over the last six
    months.

*   Less supply and increased demand improve the outlook for the municipal
    market.

INTERMEDIATE-TERM TAX-FREE

*   The portfolio had higher returns and produced more federal  tax-free  income
    than the average intermediate municipal fund, according to Lipper Inc.

*   We changed the  maturity  structure of the  portfolio  from a "barbell" to a
    "bullet," which enhanced returns as the municipal yield curve steepened over
    the last six  months  (see page 13 for a detailed  discussion  of the fund's
    maturity structure).

*   We've  maintained a slightly  long  duration for about the last year,  which
    helped returns as rates declined overall.

*   Less supply and increased demand improve the outlook for the municipal
    market.

[left margin]

"A SHARP DECLINE IN INTEREST RATES HELPED MUNICIPAL BONDS PRODUCE SOLID RETURNS
FOR THE SIX MONTHS ENDED NOVEMBER 30, 1998."

            LIMITED-TERM TAX-FREE
                   (TWTSX)
TOTAL RETURNS:               AS OF 11/30/98
    6 Months                         2.90%*
    1 Year                            5.51%
NET ASSETS:                   $40.5 million
30-DAY SEC YIELD:                     3.36%
INCEPTION DATE:                      3/1/93

              INTERMEDIATE-TERM
                  TAX-FREE
                   (TWTIX)
TOTAL RETURNS:               AS OF 11/30/98
    6 Months                         3.56%*
    1 Year                            6.77%
NET ASSETS:                  $147.5 million
30-DAY SEC YIELD:                     3.69%
INCEPTION DATE:                      3/2/87

* Not annualized.

See  Total  Returns  on pages 5 and 11.  Investment  terms  are  defined  in the
Glossary on page 47.


2      1-800-345-2021


Report Highlights
- --------------------------------------------------------------------------------
                                                                    (Continued)

LONG-TERM TAX-FREE

*   Long-Term Tax-Free performed very well, continuing to produce higher returns
    and more federal  tax-free income than the average  general  municipal fund,
    according to Lipper Inc.

*   Keys to that solid  performance were our  below-average  management fees and
    ability to structure  the  portfolio to be immune to "calls" (for a complete
    discussion of calls, see pages 21-22).

*   The fund's  longer-term  returns are also quite  strong--over  the past five
    years,  Long-Term  Tax-Free  placed in about the top  quarter  of the Lipper
    "General Municipal Debt Funds" category.  There were 240, 198, and 141 funds
    in the category for the 1-, 3-, and 5-year periods, respectively.

*   The  portfolio's  yield  declined as  interest  rates fell over the last six
    months.

*   Less supply and increased demand improve the outlook for the municipal
    market.

HIGH-YIELD MUNICIPAL

*   Since its inception on March 31, 1998,  the fund has  generated  much better
    returns than the average high-yield municipal fund, according to Lipper Inc.

*   In addition, High-Yield Municipal produced more federal tax-free income than
    its Lipper peer group average.

*   That  solid  performance  reflects  the fact  that  we've  put  together  an
    experienced management team that's been able to invest new money coming into
    the fund quickly.

*   In addition,  we've waived  management  fees through  April 30, 1999,  which
    helped us provide competitive yields and returns right away. Without the fee
    waiver, yields and returns would have been lower.

*   We helped performance by keeping duration  relatively long as interest rates
    declined through early October.

*   Less supply and increased demand improve the outlook for the municipal
    market.

[right margin]

"LESS SUPPLY AND INCREASED DEMAND IMPROVE THE OUTLOOK FOR THE MUNICIPAL MARKET.

              LONG-TERM TAX-FREE
                    (TWTLX)
TOTAL RETURNS:               AS OF 11/30/98
    6 Months                         4.07%*
    1 Year                            7.77%
NET ASSETS:                  $125.2 million
30-DAY SEC YIELD:                     4.10%
INCEPTION DATE:                      3/2/87

             HIGH-YIELD MUNICIPAL
                    (ABHYX)
TOTAL RETURNS:               AS OF 11/30/98
    6 Months                         4.20%*
    Since Inception                  6.08%*
NET ASSETS:                   $39.5 million
30-DAY SEC YIELD:                     5.34%
INCEPTION DATE:                     3/31/98

* Not annualized.

See  Total  Returns  on pages 20 and 28.  Investment  terms are  defined  in the
Glossary on page 47.


                                                  www.americancentury.com      3


Market Perspective from Randall W. Merk
- --------------------------------------------------------------------------------
/photo of Randall W. Merk/
Randall W. Merk, director of fixed-income investing at American Century

MODERATE MUNICIPAL RETURNS

     Municipal securities turned in a positive performance during the six months
ended November 30, 1998.  Municipal bond prices rose as interest rates declined;
however,  too much  supply  and too little  demand  limited  returns.  Long-term
municipal  bonds,  which  are most  sensitive  to  changes  in  interest  rates,
performed best. For the six months, the Lehman Brothers Long-Term Municipal Bond
Index returned 4.10%.  Intermediate-term  securities,  represented by the Lehman
Brothers 5-Year General  Obligation Index,  returned 3.43%, while the short-term
Merrill Lynch 0- to 3-Year Municipal Index posted a 2.77% return.

RATES FELL

     Declines  in  interest  rates were  sparked by a series of global  economic
crises that threatened to slow the U.S.  economy.  In addition,  an abundance of
cheap  imports and falling  commodity  prices  helped keep  inflation  low.  The
government's consumer price index rose just 1.5% for the year ended November 30,
1998. That's the slowest pace in a dozen years.

     In an attempt to boost the  economy  and restore  confidence  to  financial
markets, the U.S. Federal Reserve cut short-term interest rates three times from
September to November, its first rate reductions since January 1996.

MUNICIPALS LAGGED TREASURYS

     Plummeting stock markets,  currency devaluations,  and debt defaults caused
investors  around the world to demand the safety and liquidity of U.S.  Treasury
bonds.  That  surge in demand  led to record  low bond  yields and huge gains by
Treasury  securities.  Because  foreign  investors  don't  benefit  from the tax
advantages of municipal bonds, demand for municipals lagged.

     Furthermore,  the  supply of  municipals  surged.  Motivated  by  declining
interest  rates,  municipal  issuers sought to lock in lower  borrowing costs by
issuing  new debt  and/or  refinancing  older  debt.  For the six  months  ended
November 30, 1998,  new issue volume was up about a third compared with the same
six-month  period a year ago. These supply and demand  factors caused  municipal
bonds to underperform Treasury securities for the six months.

STEEPER YIELD CURVE

     Reflecting  the  Fed's  interest  rate  cuts,   short-term   rates  dropped
dramatically.  For the six months,  the yield on one-year  municipal  securities
fell roughly 62 basis points (a basis point  equals  0.01%),  while the yield on
30-year  municipal  bonds fell only about 15 basis points.  This resulted in the
steeper  yield  curve  shown in the  accompanying  graph.  The yield  difference
between a one-year  note and a 30-year bond rose to 176 basis points on November
30, 1998, compared with 128 basis points just six months earlier.

[left margin]

"MUNICIPAL SECURITIES TURNED IN A POSITIVE PERFORMANCE DURING THE SIX MONTHS
ENDED NOVEMBER 30, 1998."

[line chart - data below]

STEEPER MUNICIPAL YIELD CURVE

Years to Maturity    11/30/98           5/31/98
1                     3.060%             3.690%
2                     3.360%             3.850%
3                     3.510%             3.950%
4                     3.630%             4.040%
5                     3.730%             4.090%
6                     3.825%             4.160%
7                     3.920%             4.230%
8                     4.000%             4.300%
9                     4.080%             4.370%
10                    4.160%             4.440%
11                    4.248%             4.514%
12                    4.336%             4.588%
13                    4.424%             4.662%
14                    4.512%             4.736%
15                    4.600%             4.810%
16                    4.636%             4.836%
17                    4.672%             4.862%
18                    4.708%             4.888%
19                    4.744%             4.914%
20                    4.780%             4.940%
21                    4.784%             4.942%
22                    4.788%             4.944%
23                    4.792%             4.946%
24                    4.796%             4.948%
25                    4.800%             4.950%
26                    4.804%             4.954%
27                    4.808%             4.958%
28                    4.812%             4.962%
29                    4.816%             4.966%
30                    4.820%             4.970%

Source: Bloomberg Financial Markets

"DECLINES IN INTEREST RATES WERE SPARKED BY A SERIES OF GLOBAL ECONOMIC CRISES
THAT THREATENED TO SLOW THE U.S. ECONOMY."


4      1-800-345-2021


Limited-Term Tax-Free--Performance
- --------------------------------------------------------------------------------
TOTAL RETURNS AS OF NOVEMBER 30, 1998
<TABLE>
                                                    INCEPTION 3/1/93
                        LIMITED-TERM    MERRILL LYNCH 0- TO   SHORT/INTERMEDIATE MUNI DEBT FUNDS(2)
                          TAX-FREE       3-YEAR MUNI INDEX      AVERAGE RETURN     FUND'S RANKING
- ------------------------------------------------------------------------------------------------
<S>                      <C>                 <C>                <C>                 <C>                    
6 MONTHS(1) ............    2.90%              2.77%               2.70%                --
1 YEAR .................    5.51%              5.12%               5.03%            5 OUT OF 30
- ------------------------------------------------------------------------------------------------
AVERAGE ANNUAL RETURNS
3 YEARS ................    4.84%              4.56%               4.50%            6 OUT OF 24
5 YEARS ................    4.78%              4.48%               4.37%            2 OUT OF 14
LIFE OF FUND ...........    4.62%              4.35%               4.61%(3)         7 OUT OF 11(3)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Since 3/31/93,  the date nearest the fund's  inception for which return data
    are available.

See pages 46-47 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain chart - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 11/30/98
Limited-Term Tax-Free       $12,965
Merrill-Lynch 0- to
   3-Year Muni Index        $12,775

                    Limited-Term        Merrill-Lynch 0- to
                      Tax-Free           3-Year Muni Index
DATE                    VALUE                  VALUE
3/1/93                 $10,000                $10,000
3/31/93                $10,014                 $9,991
6/30/93                $10,132                $10,110
9/30/93                $10,227                $10,149
12/31/93               $10,337                $10,322
3/31/94                $10,322                $10,319
6/30/94                $10,426                $10,396
9/30/94                $10,524                $10,499
12/31/94               $10,591                $10,458
3/31/95                $10,790                $10,693
6/30/95                $10,964                $10,904
9/30/95                $11,110                $11,064
12/31/95               $11,305                $11,213
3/31/96                $11,364                $11,325
6/30/96                $11,434                $11,403
9/30/96                $11,564                $11,535
12/31/96               $11,721                $11,672
3/31/97                $11,768                $11,728
6/30/97                $12,007                $11,907
9/30/97                $12,204                $12,073
12/31/97               $12,378                $12,222
3/31/98                $12,501                $12,356
6/30/98                $12,627                $12,476
9/30/98                $12,892                $12,680
11/30/98               $12,965                $12,775

$10,000 investment made 3/1/93

The chart at left shows the growth of a $10,000  investment over the life of the
fund,  while the chart  below  shows the fund's  year-by-year  performance.  The
Merrill Lynch 0- to 3-Year  Municipal  Index is provided for  comparison in each
chart.  Limited-Term  Tax-Free's  returns  include  operating  expenses (such as
transaction costs and management fees) that reduce returns, while the returns of
the index do not. Past performance does not guarantee future results. Investment
return and principal value will fluctuate,  and redemption  value may be more or
less than original cost.

[bar chart - data below]

ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDED NOVEMBER 30)
                    Limited-Term        Merrill-Lynch 0- to
                      Tax-Free           3-Year Muni Index
DATE                   RETURN                RETURN
11/30/93*               2.65%                2.54%
11/30/94                2.80%                1.67%
11/30/95                6.62%                7.19%
11/30/96                4.11%                4.15%
11/30/97                4.91%                4.42%
11/30/98                5.51%                5.12%

* From 3/1/93, the fund's inception date.


                                                  www.americancentury.com      5


Limited-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
/photo of Joel Silva/

     An  interview  with Joel  Silva,  a portfolio  manager on the  Limited-Term
Tax-Free fund investment team.

HOW DID  LIMITED-TERM  TAX-FREE PERFORM DURING THE SIX MONTHS ENDED NOVEMBER 30,
1998?

     The  portfolio  continued to perform  well,  producing  better-than-average
returns.  Over the last six months,  the fund returned 2.90%,  compared with the
2.70% average return of the 31 "Short/Intermediate Municipal Debt Funds" tracked
by Lipper Inc.  Limited-Term  Tax-Free's relative performance over the last year
is even better,  with the portfolio  ranking fifth in its Lipper group. (See the
Total  Returns  table on the  previous  page  for  additional  fund  performance
comparisons.)

WHAT CHANGES DID YOU MAKE TO THE PORTFOLIO OVER THE LAST SIX MONTHS?

     Perhaps  the  biggest  change  we made was to  upgrade  the  fund's  credit
quality.  By the end of  November,  more than  three-quarters  of assets were in
bonds rated AAA and AA, compared with about two-thirds of assets just six months
ago.

     We made the  change  because we think  municipal  credit  quality  may have
peaked.  Economic turmoil in Asia and Latin America has reduced demand for goods
produced in the U.S.  While we don't expect a recession,  we do believe we're in
for slower  growth.  That could take a toll on  municipal  tax revenues and drag
down credit quality. In addition, credit quality has been helped in recent years
by easy  access to bond  insurance.  But with the economy  likely to slow,  bond
insurers have slowed their activity.  And because  lower-rated  bonds tend to be
more  sensitive to changes in credit  conditions  and the  economy,  we think it
makes sense to increase the portfolio's quality.

HOW DO CHANGES IN CREDIT QUALITY AFFECT THE BONDS IN THE PORTFOLIO?

     A good way to understand credit risk and how it relates to a municipal bond
or fund is to look at credit  spreads.  The  spread is the  difference  in yield
between  municipal  bonds  rated BBB and AAA.  We've  written  at length in past
reports about how credit  spreads  narrowed in the last few years as a result of
an  improving  economy,  easy  access to bond  insurance,  and heavy  demand for
higher-yielding   bonds.  Narrower  yield  spreads  meant  BBB  bonds  generally
outperformed  higher-rated  debt in recent years.  And as long as credit quality
was  improving,  we were  content  to  hold  lower-rated  bonds  and  boost  our
performance.

     For  example,  let's  look at the  fund's  New  York  holdings.  We  bought
lower-rated  New York bonds at attractive  prices some time ago. We sold some of
those  securities  in the summer  after  they'd  been  upgraded,  yield  spreads
narrowed,  and their  prices  rose.  That move  turned out to be  timely--credit
spreads widened in the late summer and fall, and these bonds  underperformed AAA
securities. Spreads widened because New York's economy and tax revenues are

[left margin]

"THE PORTFOLIO CONTINUED TO PERFORM WELL, PRODUCING BETTER-THAN-AVERAGE
RETURNS."

YIELDS AS OF NOVEMBER 30, 1998
  30-DAY SEC YIELD
                                   3.36%
  30-DAY TAX-EQUIVALENT YIELDS
    28.0% TAX BRACKET              4.67%
    31.0% TAX BRACKET              4.87%
    36.0% TAX BRACKET              5.25%
    39.6% TAX BRACKET              5.56%

PORTFOLIO AT A GLANCE
                          11/30/98          5/31/98
NUMBER OF SECURITIES         38               36
WEIGHTED AVERAGE
  MATURITY                 3.7 YRS          3.6 YRS
AVERAGE DURATION           3.2 YRS          2.9 YRS
EXPENSE RATIO              0.52%*           0.52%*

* Annualized.

Investment terms are defined in the Glossary on page 47.


6      1-800-345-2021


Limited-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

closely  tied to the health of the  finance  sector,  which was very hard hit by
volatility in global financial markets from July to October. In our opinion, the
risk of holding some of these  lower-rated  bonds  outweighed  the advantages of
picking up the small amount of extra yield they offered.  As a result, we locked
in our gains, sacrificing some yield to get the boost in return.

TAKING PROFITS BY SELLING SOME OF THOSE LOWER-RATED BONDS HAS THE POTENTIAL TO
GENERATE CAPITAL GAINS. DO YOU TRY TO LIMIT CAPITAL GAINS AT ALL?

     Yes, we evaluate all our trades on the basis of after-tax total return.  We
always ask ourselves, "Does this trade make sense for a tax-sensitive investor?"
For a trade to meet that criterion,  we have to be convinced that it makes sense
from both a return and a capital gain  perspective.  For  example,  when we sold
those  New York  bonds,  not only did we look at the trade  from a total  return
perspective,  but we also considered what it meant in terms of realized  capital
gains.  Ways we try to limit  capital  gains are by  carrying  over  losses from
previous tax years and by doing tax-loss swaps in the current year when we can.

THE FUND'S YIELD DECLINED OVER THE LAST SIX MONTHS. IS THAT A RESULT OF SELLING
THOSE LOWER-RATED, HIGHER-YIELDING BONDS?

     Not entirely.  The main reason  Limited-Term  Tax-Free has a lower yield is
that interest  rates fell quite a bit over the last six months.  Rates came down
across the  municipal  yield  curve,  but they fell most  sharply for short- and
intermediate-term bonds. According to Bloomberg Financial Services, the yield on
a  three-year  AAA  municipal  bond fell 43 basis  points (a basis point  equals
0.01%,  so 43 basis points  equals  0.43%).  In  addition,  the 30-day SEC yield
depends in part on the fund's share  price--the  higher the price, the lower the
yield.  Because  Limited-Term  Tax-Free's  share  price  rose  between  May  and
November, its yield declined (for a definition of SEC yield, see the Glossary on
page 47).

     However,  it is true that  reducing our exposure to  lower-rated  municipal
bonds did marginally  reduce  Limited-Term  Tax-Free's yield. But we think we've
done a good job of upgrading the fund's quality without throwing in the towel on
yield. For example,  six months ago the portfolio's  yield was 3.67%,  while the
average  yield of our Lipper group was 3.60%.  As of November 30, the  portfolio
had a 3.36% 30-day SEC yield, which was still higher than the 3.28% yield of the
Lipper category average. So we're still giving shareholders  better-than-average
yields,  and we did that while upgrading the fund's credit quality.  However,  a
portion  of income  will be taxable  for  shareholders  subject  to the  federal
alternative minimum tax.

DID YOU MAKE ANY CHANGES TO DURATION?

     Over the last six months,  we lengthened  duration slightly from 2.9 to 3.2
years.  Interest rates declined  during the period,  so having a longer duration
helped returns. (The longer a fund's duration, the more its share price tends to
rise when rates decline and fall when rates  increase.)  That  relatively  small
change is  consistent  with our  policy of making  only  modest  adjustments  to
duration  over time.  Rather  than make big bets on the  direction  of  interest
rates,  we try to  outperform  our peers  through  careful  credit  analysis and
security selection.

[right margin]

"INTEREST RATES DECLINED DURING THE PERIOD, SO HAVING A LONGER DURATION HELPED
RETURNS."

TOP FIVE STATES (AS OF 11/30/98)
                  % OF FUND INVESTMENTS
OHIO                      10.6%
MICHIGAN                   9.7%
NEW YORK                   9.5%
CALIFORNIA                 7.1%
MISSOURI                   6.9%

TOP FIVE STATES (AS OF 5/31/98)
                  % OF FUND INVESTMENTS
NEW YORK                  18.5%
MISSOURI                  11.9%
CALIFORNIA                11.3%
OHIO                      10.6%
ARIZONA                    5.9%


                                                  www.americancentury.com      7


Limited-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

WHAT'S YOUR OUTLOOK FOR THE MUNICIPAL MARKET?

     We like the outlook for municipal bonds for a number of reasons.  Inflation
rose at the slowest annual pace in a dozen years for the year ended November 30,
1998. With inflation so low and the economy facing pressure from global economic
turmoil,  we believe the Federal  Reserve  probably  has room to lower  interest
rates even further.

     Supply and demand  factors also look positive  going  forward.  As interest
rates declined this year, many municipalities refinanced their older debt at the
new lower rate.  All that supply  limited  municipal  bonds' gains in 1998.  But
bonds can only be  refinanced a limited  number of times,  so we should see less
new supply going forward.  Meanwhile, demand for municipal bonds is likely to be
strong because municipals are very attractively valued relative to Treasurys.

GIVEN THAT OUTLOOK,  WHAT ARE YOUR PLANS FOR LIMITED-TERM  TAX-FREE FOR THE NEXT
SIX MONTHS?

     It's a steady-at-the-helm approach--we're going to continue to work to give
investors solid tax-exempt yields and good total return. But as we've discussed,
we won't sacrifice  principal to reach for extra yield.  That means we're likely
to continue to upgrade the fund's  credit  quality when we think we can sell our
lower-rated  bonds at attractive  prices.  Because we think  interest  rates are
likely to head lower, we'll continue to keep duration slightly longer than three
years. Overall, we'll use careful credit analysis and security selection to find
what we think are the best bonds in the market.  That's the same strategy that's
helped the fund to such solid long-term performance.

[left margin]

PORTFOLIO COMPOSITION BY CREDIT RATING
             % OF FUND INVESTMENTS
            AS OF             AS OF
          11/30/98           5/31/98
AAA          57%               51%
AA           21%               17%
A             6%               12%
BBB          16%               20%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 46
for more information.

TOP FIVE SECTORS (AS OF 11/30/98)
                            % OF FUND INVESTMENTS
GO                                    20%
COPS/LEASES                           19%
ELECTRIC REVENUE                      11%
TRANSPORTATION REVENUE                11%
SALES TAX REVENUE                      7%

TOP FIVE SECTORS (AS OF 5/31/98)
                            % OF FUND INVESTMENTS
COPS/LEASES                           27%
GO                                    22%
TRANSPORTATION REVENUE                12%
ELECTRIC REVENUE                       7%
WATER AND SEWER REVENUE                6%

Security types are defined on page 47.


8      1-800-345-2021


Limited-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                         Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--98.4%
ALASKA--4.7%
                   $  850  Alaska Industrial Development &
                              Export Auth. Power Rev.,
                              Series 1998-1, (Snettisham
                              Hydroelectric), 4.50%, 1/1/00         $  859
                    1,000  Alaska Industrial Development &
                              Export Auth. Rev.,
                              Series 1998 A, 4.50%,
                              4/1/01 (MBIA)                          1,015
                                                                  ---------
                                                                     1,874
                                                                  ---------
ARIZONA--6.5%
                    1,500  Arizona Transportation Board
                              Excise Tax Rev., (Maricopa
                              County), 5.60%, 7/1/02
                              (AMBAC)                                1,593
                      515  Maricopa County COP, 5.625%,
                              6/1/00                                   524
                      500  Maricopa County School
                              District No. 11 GO,
                              Series 1998 C, (Peoria
                              University), 4.20%, 7/1/05
                              (FGIC)                                   508
                                                                  ---------
                                                                     2,625
                                                                  ---------
CALIFORNIA--7.1%
                    1,225  Garden Grove Agency Community
                              Development Tax Allocation,
                              (Garden Grove Community),
                              5.20%, 10/1/01                         1,274
                    1,500  Long Beach Harbor Rev.,
                              Series 1998 A, 5.00%,
                              5/15/03 (FGIC)                         1,577
                                                                  ---------
                                                                     2,851
                                                                  ---------
COLORADO--6.6%
                    1,000  Denver Colorado City & County
                              Airport Rev., Series 1996 B,
                              5.25%, 11/15/02 (MBIA)                 1,050
                      500  Denver Health & Hospital Rev.,
                              Series 1998 A, 4.75%,
                              12/1/01                                  508
                    1,000  Highlands Ranch Metropolitan
                              District #2 GO, 6.00%,
                              6/15/02 (FSA)                          1,074
                                                                  ---------
                                                                     2,632
                                                                  ---------
FLORIDA--4.8%
                      210  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., Series 1998 A,
                              (Multi-County Program), 4.70%,
                              10/1/05 (GNMA/FNMA)                      213

Principal Amount           ($ in Thousands)                         Value
- --------------------------------------------------------------------------------
                   $1,550  Jacksonville Electric Auth. Rev.,
                              (St. John's River), 6.00%,
                              10/1/04                              $ 1,714
                                                                  ---------
                                                                     1,927
                                                                  ---------
ILLINOIS--2.6%
                    1,000  Illinois Civic Center Rev., 5.00%,
                              12/15/05 (AMBAC)                       1,055
                                                                  ---------
INDIANA--2.6%
                    1,000  Central High School Building
                              Corp. Rev., 5.25%, 2/1/04
                              (AMBAC)                                1,056
                                                                  ---------
KENTUCKY--2.5%
                    1,000  Carrollton & Henderson Public
                              Energy Auth. Gas Rev.,
                              Series 1998 B, 4.20%,
                              1/1/06 (FSA)                             999
                                                                  ---------
MICHIGAN--9.7%
                    1,000  Detroit Downtown Development
                              Auth. Tax Increment Rev.,
                              Series 1998 C, (Development
                              Area No. 1), 4.10%, 7/1/03
                              (MBIA)                                 1,008
                      880  Detroit GO, Series 1995 A,
                              5.40%, 5/1/00                            901
                      385  Detroit GO, Series 1995 B,
                              5.10%, 4/1/99                            387
                      500  Detriot GO, Series 1995 B,
                              6.50%, 4/1/02                            537
                    1,000  Michigan Municipal Board Auth.
                              Rev., 5.00%, 12/1/05                   1,060
                                                                  ---------
                                                                     3,893
                                                                  ---------
MISSISSIPPI--2.3%
                      935  Mississippi Lease Rev. COP,
                              Series 1997 A, 4.60%,
                              4/15/99 (AMBAC)                          940
                                                                  ---------
MISSOURI--6.9%
                    1,675  North Kansas City School District
                              GO, 5.00%, 3/1/00                      1,709
                    1,000  Springfield State Highway
                              Improvement Corp. Rev., 5.05%,
                              8/1/03 (AMBAC)                         1,051
                                                                  ---------
                                                                     2,760
                                                                  ---------
MONTANA--2.5%
                    1,000  Forsyth Pollution Control Rev.,
                              Series 1998 B, 4.75%, 5/1/03           1,011
                                                                  ---------
NEW JERSEY--5.9%
                      500  New Jersey Educational Facilities
                              Auth. Rev., Series 1998 B,
                              (St. Peters College), 4.60%,
                              7/1/01                                   508

See Notes to Financial Statements


                                                  www.americancentury.com      9


Limited-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                         Value
- --------------------------------------------------------------------------------
                   $1,750  West Windsor Plainsboro GO,
                              5.25%, 12/1/02 (FGIC)                $ 1,850
                                                                  ---------
                                                                     2,358
                                                                  ---------
NEW YORK--9.5%
                    2,145  New York City Municipal
                              Assistance Corp. Rev.,
                              Series 1997 I, 5.25%, 7/1/02           2,250
                      500  New York State Dormitory Auth.
                              Rev., Series 1998 I, (New York
                              Downtown Hospital), 4.80%,
                              2/15/06                                  512
                    1,000  New York State Serial Bonds GO,
                              6.70%, 11/15/99                        1,034
                                                                  ---------
                                                                     3,796
                                                                  ---------
OHIO--10.6%
                    2,070  Ohio Building Auth. Rev.,
                              Series 1997 A, (Highway
                              Safety Building), 5.00%,
                              10/1/03 (AMBAC)                        2,175
                      500  Ohio Public Facilities Commission
                              Rev., Series 1998 A, 4.50%,
                              12/1/04                                  516
                    1,500  Ohio Water Development Auth.
                              Pollution Control Facilities Rev.,
                              5.00%, 6/1/04 (MBIA)                   1,580
                                                                  ---------
                                                                     4,271
                                                                  ---------
RHODE ISLAND--1.5%
                      570  Rhode Island Economic
                              Development Corp. Airport Rev.,
                              Series 1998 A, 5.00%,
                              7/1/03 (FSA)                             595
                                                                  ---------

Principal Amount           ($ in Thousands)                         Value
- --------------------------------------------------------------------------------
SOUTH CAROLINA--4.9%
                   $  855  Piedmont Municipal Power
                              Agency Rev., Series 1991 A,
                              6.00%, 1/1/02 (FGIC)                  $  909
                    1,000  South Carolina Public Service
                              Auth. Rev., Series 1998 A,
                              5.00%, 1/1/02                          1,036
                                                                  ---------
                                                                     1,945
                                                                  ---------
TENNESSEE--2.7%
                    1,050  Jackson Hospital Rev., (Madison
                              County General Hospital),
                              4.50%, 4/1/00 (AMBAC)                  1,064
                                                                  ---------
TEXAS--4.5%
                    1,000  Colorado River Municipal Water
                              District Rev., Series 1991 A,
                              8.50%, 1/1/01, Prerefunded at
                              100% of Par (AMBAC)(1)                 1,098
                      685  Denison Hospital Auth. Rev.,
                              (Texoma Medical Center),
                              5.00%, 8/15/00                           695
                                                                  ---------
                                                                     1,793
                                                                  ---------
TOTAL MUNICIPAL SECURITIES                                          39,445
                                                                  ---------
           (Cost $38,559)

TEMPORARY CASH INVESTMENTS--1.6%
                      656  Units of Participation in Chase
                              Visa Tax-Free Money Market
                              Fund (Institutional Shares)              656
                                                                  ---------
   (Cost $656)

TOTAL INVESTMENT SECURITIES--100.0%                                $40,101
                                                                  =========
   (Cost $39,215)

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

COP = Certificates of Participation

FGIC = Financial Guaranty Insurance Co.

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GNMA = Government National Mortgage Association

GO = General Obligation

MBIA = MBIA Insurance Corp.

(1) Escrowed to maturity in U.S. Government securities.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* principal amount of each investment

* the market value of each investment

* the percentage of investments in each state

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


10      1-800-345-2021


Intermediate-Term Tax-Free--Performance
- --------------------------------------------------------------------------------
TOTAL RETURNS AS OF NOVEMBER 30, 1998
<TABLE>
                                INCEPTION 3/2/87
                  INTERMEDIATE-TERM    LEHMAN 5-YEAR    INTERMEDIATE MUNICIPAL DEBT FUNDS(2)
                       TAX-FREE           GO INDEX        AVERAGE RETURN    FUND'S RANKING
- ------------------------------------------------------------------------------------------
<S>                 <C>              <C>               <C>                 <C>                  
6 MONTHS(1) ......       3.56%             3.43%               3.18%              --
1 YEAR ...........       6.77%             6.32%               6.31%         33 OUT OF 148
- ------------------------------------------------------------------------------------------
AVERAGE ANNUAL RETURNS
3 YEARS ..........       5.80%             5.68%               5.57%         44 OUT OF 121
5 YEARS ..........       5.56%             5.55%               5.50%         31 OUT OF 78
10 YEARS .........       6.59%             6.96%               6.94%         21 OUT OF 27
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

See pages 46-47 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain chart - data below]

GROWTH OF $10,000 OVER 10 YEARS
Value on 11/30/98
Intermdiate-Term Tax-Free       $18,938
Lehman 5-Year GO Index          $19,607

                   Intermediate-Term         Lehman 5-Year
                       Tax-Free                GO Index
DATE                     VALUE                  VALUE
11/30/88                $10,000                $10,000
11/30/89                $10,671                $10,815
11/30/90                $11,370                $11,651
11/30/91                $12,315                $12,724
11/30/92                $13,369                $13,879
11/30/93                $14,449                $14,966
11/30/94                $14,175                $14,831
11/30/95                $15,989                $16,610
11/30/96                $16,787                $17,500
11/30/97                $17,737                $18,442
11/30/98                $18,938                $19,607

$10,000 investment made 11/30/88

The chart at left shows the growth of a $10,000  investment  in the fund over 10
years,  while the chart below  shows the fund's  year-by-year  performance.  The
Lehman   5-Year  GO  Index  is   provided   for   comparison   in  each   chart.
Intermediate-Term   Tax-Free's  returns  include  operating  expenses  (such  as
transaction costs and management fees) that reduce returns, while the returns of
the index do not. Past performance does not guarantee future results. Investment
return and principal value will fluctuate,  and redemption  value may be more or
less than original cost.

[bar chart - data below]

ONE-YEAR RETURNS OVER 10 YEARS (PERIODS ENDED NOVEMBER 30)
                   Intermediate-Term       Lehman 5-Year
                       Tax-Free              GO Index
DATE                    RETURN                RETURN
11/30/89                 6.71%                 8.15%
11/30/90                 6.55%                 7.73%
11/30/91                 8.31%                 9.21%
11/30/92                 8.56%                 9.08%
11/30/93                 8.08%                 7.83%
11/30/94                -1.90%                -0.90%
11/30/95                12.80%                11.99%
11/30/96                 4.99%                 5.36%
11/30/97                 5.66%                 5.38%
11/30/98                 6.77%                 6.32%


                                                 www.americancentury.com      11


Intermediate-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------

     An interview with Joel Silva  (pictured on page 6), a portfolio  manager on
the Intermediate-Term Tax-Free fund investment team.

HOW DID INTERMEDIATE-TERM  TAX-FREE PERFORM DURING THE SIX MONTHS ENDED NOVEMBER
1998?

     The portfolio  performed well. Over the last six months,  the fund returned
3.56%, compared with the 3.18% average return of the 150 "Intermediate Municipal
Debt Funds" tracked by Lipper Inc. Limited-Term  Tax-Free's relative performance
over the last several  years is  similarly  strong.  The fund also  continued to
outperform its benchmark,  the Lehman Brothers  5-Year GO Index.  (See the Total
Returns table on the previous page for detailed performance comparisons.)

HOW DID INTERMEDIATE-TERM TAX-FREE'S YIELD COMPARE?

     The portfolio again produced more federal  tax-free income than the average
intermediate-term  municipal fund. As of November 30, Intermediate-Term Tax-Free
had a 30-day SEC yield of 3.69%,  significantly  higher  than the 3.46% yield of
its Lipper category  average.  (See the Yields table at left for  tax-equivalent
yields.) However,  a portion of income will be taxable for shareholders  subject
to the federal alternative minimum tax.

THE FUND'S YIELD DECLINED OVER THE SIX MONTHS. WHY?

     The primary  reason  Intermediate-Term  Tax-Free  has a lower yield is that
interest rates fell quite a bit over the last six months. Rates came down across
the  municipal  yield  curve,   but  they  fell  most  sharply  for  short-  and
intermediate-term bonds. According to Bloomberg Financial Services, the yield on
a five-year AAA municipal bond fell 36 basis points (a basis point equals 0.01%,
so 36 basis points equals 0.36%). In addition,  the SEC yield depends in part on
the fund's  share  price--the  higher the  price,  the lower the yield.  Because
Intermediate-Term  Tax-Free's  share price rose  between May and  November,  its
yield declined (for a definition of SEC yield, see the Glossary on page 47).

     But we should  also point out that we've  begun to reduce our  exposure  to
lower-rated securities.  BBB bonds have higher yields than AA or AAA securities,
so increasing the portfolio's  credit quality will also likely marginally reduce
the fund's yield.

WHY INCREASE INTERMEDIATE-TERM TAX-FREE'S CREDIT QUALITY?

     We're making the change because we think municipal  credit quality may have
peaked.  Economic turmoil in Asia and Latin America has reduced demand for goods
produced in the U.S.  While we don't expect a recession,  we do believe we're in
for slower  growth.  That could take a toll on  municipal  tax revenues and drag
down credit quality. In addition, credit quality has been helped in recent years
by easy  access to bond  insurance.  But with the economy  likely to slow,  bond
insurers have decreased their activity. And because lower-rated bonds tend to be
more  sensitive to changes in credit  conditions  and the  economy,  we think it
makes sense to begin to increase the portfolio's quality.

[left margin]

"THE PORTFOLIO AGAIN PRODUCED MORE FEDERAL TAX-FREE INCOME THAN THE AVERAGE
INTERMEDIATE-TERM MUNICIPAL FUND."

YIELDS AS OF NOVEMBER 30, 1998
  30-DAY SEC YIELD
                                  3.69%
  30-DAY TAX-EQUIVALENT YIELDS
    28.0% TAX BRACKET             5.13%
    31.0% TAX BRACKET             5.35%
    36.0% TAX BRACKET             5.77%
    39.6% TAX BRACKET             6.11%

PORTFOLIO AT A GLANCE
                           11/30/98          5/31/98
NUMBER OF SECURITIES          112              101
WEIGHTED AVERAGE
  MATURITY                  8.3 YRS          7.9 YRS
AVERAGE DURATION            5.4 YRS          5.4 YRS
EXPENSE RATIO               0.51%*           0.51%*

* Annualized.

Investment terms are defined in the Glossary on page 47.


12      1-800-345-2021


Intermediate-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

WHAT OTHER CHANGES DID YOU MAKE TO THE PORTFOLIO OVER THE LAST SIX MONTHS?

     We changed  the  maturity  structure  from the  "barbell"  we'd  maintained
earlier  in  the  year  to  more  of  a  "bullet"  structure.  A  barbell--which
overweights  bonds  with  short-  and  long-term   maturities  and  underweights
intermediate-term  securities--tends  to  perform  best when the yield  curve is
moving  from  steep to flat.  A bullet,  on the  other  hand,  concentrates  the
portfolio's bond maturities  around an  intermediate-term  maturity and tends to
outperform a barbell when the yield curve steepens.  Several months ago, we felt
the  municipal  yield curve was as flat as it was going to get and would  likely
steepen  going  forward.  As a result,  we locked in some of the gains  from our
barbell structure and moved toward more of a bullet.

TAKING PROFITS FROM THE MATURITY STRUCTURE TRADES YOU'VE DISCUSSED HAVE THE
POTENTIAL TO GENERATE CAPITAL GAINS. DO YOU TRY TO LIMIT CAPITAL GAINS AT ALL?

     Yes, we evaluate all our trades on the basis of after-tax total return.  We
always ask ourselves, "Does this trade make sense for a tax-sensitive investor?"
For a trade to meet that criterion,  we have to be convinced that it makes sense
from both a return and a capital gain  perspective.  In making the change from a
barbell to a bullet,  not only did we take into  account  the shape of the yield
curve and the boost the trade could give to total return, but we also considered
what we would give up in terms of realized  capital gains.  Other ways we try to
limit  capital  gains are by carrying over losses from previous tax years and by
doing tax-loss swaps in the current year when we can.

DID YOU MAKE ANY CHANGES TO DURATION?

     Not  really.  For about the last year we've  maintained  a duration  of 5.4
years,   which  is   slightly   longer   than  the   duration   of  the  average
intermediate-term  municipal fund.  (Duration measures a bond fund's sensitivity
to changes in interest rates. The longer a fund's  duration,  the more its share
price  tends to move when rates  change.)  Interest  rates  declined  during the
period, so having a longer duration helped returns.

     But the fund,  and the  municipal  market in  general,  didn't get as big a
boost as you might  expect out of lower  rates.  That's  because  the decline in
market   rates  was   driven  in  part  by  a  flight  to   quality  by  foreign
investors--investors who don't benefit from municipal bonds' tax advantages.  As
a result,  municipal  bonds  didn't  participate  fully in the  rally  that sent
Treasury prices soaring.

     But a side  effect  of  that  rally  is  that  municipal  bonds  look  very
attractive  relative  to  Treasurys  right now.  In fact,  we think the two most
likely  scenarios  suggest  municipal  bonds could  outperform  Treasurys  going
forward.  We believe either  Treasury bond yields will stay near record lows and
municipal bond yields will also work lower,  or Treasury yields will back up and
municipal  bonds will stay about where they are,  losing less than  Treasurys if
rates rise.

[right margin]

"WE THINK THE TWO MOST LIKELY SCENARIOS SUGGEST MUNICIPAL BONDS COULD
OUTPERFORM TREASURYS GOING FORWARD."

TOP FIVE STATES (AS OF 11/30/98)
                   % OF FUND INVESTMENTS
NEW YORK                    14.6%
TEXAS                       14.2%
WASHINGTON                  13.6%
MASSACHUSETTS                7.6%
CALIFORNIA                   5.9%

TOP FIVE STATES (AS OF 5/31/98)
                   % OF FUND INVESTMENTS
NEW YORK                    16.9%
TEXAS                       13.7%
WASHINGTON                  12.5%
MASSACHUSETTS                9.5%
PENNSYLVANIA                 5.0%


                                                 www.americancentury.com      13


Intermediate-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

ARE THERE OTHER REASONS TO LIKE THE OUTLOOK FOR THE MUNICIPAL MARKET?

     Yes,  we think so.  Inflation  rose at the  slowest  annual pace in a dozen
years for the year  ended  November  30,  1998.  With  inflation  so low and the
economy facing  pressure from global  economic  turmoil,  we believe the Federal
Reserve probably has room to lower interest rates even further.

     Supply and demand  factors also look positive  going  forward.  As interest
rates declined this year, many municipalities refinanced their older debt at the
new lower rate.  All that supply  limited  municipal  bonds' gains in 1998.  But
bonds can only be  refinanced a limited  number of times,  so we should see less
new supply going forward.  Meanwhile, demand for municipal bonds is likely to be
strong because of their attractive values relative to Treasurys.

GIVEN THAT OUTLOOK, WHAT ARE YOUR PLANS FOR  INTERMEDIATE-TERM  TAX-FREE FOR THE
NEXT SIX MONTHS?

     It's a steady-at-the-helm approach--we're going to continue to work to give
investors  solid  tax-exempt  yields  and good  total  return.  We're  likely to
continue  to upgrade  the fund's  credit  quality  when we think we can sell our
lower-rated  bonds at attractive  prices.  Because we think  interest  rates are
likely to head lower,  we'll continue to keep duration a little longer than five
years. Overall, we'll use careful credit analysis and security selection to find
what we think are the best bonds in the market.  That's the same strategy that's
helped the fund to such solid long-term performance.

[left margin]

PORTFOLIO COMPOSITION BY CREDIT RATING
            % OF FUND INVESTMENTS
            AS OF             AS OF
          11/30/98           5/31/98
AAA          73%               71%
AA           12%               13%
A            11%               10%
BBB           4%                6%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 46
for more information.

TOP FIVE SECTORS (AS OF 11/30/98)
                            % OF FUND INVESTMENTS
GO                                    21%
WATER AND SEWER REVENUE               14%
ELECTRIC REVENUE                      13%
HOSPITAL REVENUE                      12%
COPS/LEASES                           11%

TOP FIVE SECTORS (AS OF 5/31/98)
                            % OF FUND INVESTMENTS
COPS/LEASES                           17%
GO                                    16%
ELECTRIC REVENUE                      14%
WATER AND SEWER REVENUE               13%
HOSPITAL REVENUE                      11%

Security types are defined on page 47.


14      1-800-345-2021


Intermediate-Term Tax-Free--Sch. of Investments
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--98.0%
ALASKA--1.1%
                   $1,130  Alaska Industrial Development
&
                              Export Auth. Power Rev.,
                              (Snettisham Hydroelectric),
                              5.25%, 1/1/04 (AMBAC)                $  1,184
                     500   Anchorage Hospital Rev.,
                              (Sisters of Providence), 6.50%,
                              10/1/99                                   514
                                                                  ----------
                                                                      1,698
                                                                  ----------
ARIZONA--1.4%
                     510   Maricopa County COP, 5.625%,
                              6/1/00                                    519
                     500   Maricopa County Unified School
                              District No. 80 GO, (Chandler),
                              5.20%, 7/1/13 (MBIA)                      532
                     600   Pima County Unified School
                              District No. 6 GO, (Marana),
                              4.75%, 7/1/12 (FGIC)                      609
                   1,130   Sedona Wastewater Municipal
                              Property Corp. Excise Tax Rev.,
                              4.85%, 7/1/22 (MBIA)(1)                   346
                                                                  ----------
                                                                      2,006
                                                                  ----------
CALIFORNIA--3.9%
                   1,185   Association of Bay Area
                              Governments Finance Auth. for
                              Nonprofit Corporations COP,
                              (Rhoda Haas Goldman Plaza),
                              5.00%, 5/15/06 (California
                              Mortgage Insurance)                     1,252
                   2,000   California Housing Finance
                              Agency Rev., 5.60%, 8/1/09
                              (MBIA)                                  2,144
                   1,100   California Public Works Board
                              Lease Rev., Series 1994 A,
                              (Various University of California
                              Projects), 6.15%, 11/1/04
                              Prerefunded at 102% of Par(2)           1,258
                   1,100   Sacramento Regional
                              Transportation COP, Series
                              1992 A, 6.20%, 3/1/00                   1,138
                                                                  ----------
                                                                      5,792
                                                                  ----------
COLORADO--0.7%
                   1,000   Denver Sales Tax Rev.,
                              Series 1991 A, (Major League
                              Baseball Stadium District),
                              6.10%, 10/1/01 (FGIC)                   1,065
                                                                  ----------
DISTRICT OF COLUMBIA--1.7%
                   1,000   District of Columbia Hospital Rev.,
                              Series 1993 A, (Medlantic
                              Health Care Group), 5.25%,
                              8/15/02 (MBIA)                          1,045

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
                  $1,275   Metropolitan Washington D.C.
                              Airports Auth. Rev.,
                              Series 1992 A, 6.30%,
                              10/1/03 (MBIA)                       $  1,401
                                                                  ----------
                                                                      2,446
                                                                  ----------
FLORIDA--3.2%
                     700   Broward County School District
                              GO, 6.75%, 2/15/00                        719
                     245   Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., Series 1998 A,
                              (Multi-County Program), 4.85%,
                              10/1/07 (GNMA/FNMA)                       250
                     360   Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., Series 1998 A,
                              (Multi-County Program), 4.90%,
                              4/1/08 (GNMA/FNMA)                        366
                   1,775   Lakeland Electric and Water Rev.,
                              Series 1996 B, 6.00%,
                              10/1/09 (FGIC)                          2,038
                     345   Pinellas County Educational
                              Facilities Auth. Rev., (Barry
                              University), 4.35%, 10/1/00               348
                   1,000   Royal Palm Beach Utility System
                              Rev., 5.125%, 10/1/18 (MBIA)            1,018
                                                                  ----------
                                                                      4,739
                                                                  ----------
GEORGIA--4.1%
                   1,000   Atlanta Airport Facilities Rev.,
                              7.00%, 1/1/01                           1,064
                   1,000   Atlanta Water and Sewer Rev.,
                              (Second Lien), 6.00%, 1/1/05
                              (FGIC)                                  1,107
                   2,495   Fulton County Water and Sewer
                              Rev., 6.25%, 1/1/09 (FGIC)              2,891
                   1,000   Metropolitan Atlanta Rapid Transit
                              Auth. Sales Tax Rev., Series
                              1991 M, 6.05%, 7/1/01                   1,057
                                                                  ----------
                                                                      6,119
                                                                  ----------
HAWAII--1.4%
                   1,000   Hawaii State GO, Series 1990 A,
                              7.00%, 6/1/00 (FGIC)(2)                 1,052
                   1,000   Hawaii State GO, Series
                              1997 CN, 5.25%, 3/1/13
                              (FGIC)                                  1,046
                                                                  ----------
                                                                      2,098
                                                                  ----------
ILLINOIS--1.6%
                   2,250   Illinois GO, 6.00%, 10/1/01                2,388
                      30   Metropolitan Pier and Exposition
                              Auth. Rev., (McCormick Place),
                              5.20%, 6/15/99(2)                          30
                                                                  ----------
                                                                      2,418
                                                                  ----------

See Notes to Financial Statements


                                                 www.americancentury.com      15


Intermediate-Term Tax-Free--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
INDIANA--1.4%
                  $2,000   Indiana Health Facility Financing
                              Auth. Rev., (Holy Cross Health
                              System Corp.), 5.375%,
                              12/1/12 (MBIA)                       $  2,121
                                                                  ----------
MASSACHUSETTS--7.6%
                   2,605   Massachusetts Bay Transportation
                              Auth. Rev., Series 1992 C,
                              5.40%, 3/1/00                           2,670
                   1,000   Massachusetts Educational
                              Financing Auth. Education Loan
                              Rev., Series 1998 A, (Issue G),
                              4.55%, 12/1/06 (MBIA)                   1,012
                   1,000   Massachusetts Health &
                              Educational Facilities Auth. Rev.,
                              Series 1998 A, (Harvard
                              Pilgrim Health), 5.25%, 7/1/12
                              (FSA)                                   1,054
                   3,000   Massachusetts Water Resource
                              Auth. Rev., Series 1998 A,
                              4.75%, 8/1/27 (FSA)                     2,888
                   1,000   Massachusetts Water Resource
                              Auth. Rev., Series 1998 B,
                              4.50%, 8/1/22 (FSA)                       938
                   1,650   Springfield GO, 5.25%,
                              11/15/14 (FSA)(3)                       1,715
                   1,000   Worcester GO, 5.50%, 8/1/04
                              (MBIA)                                  1,079
                                                                  ----------
                                                                     11,356
                                                                  ----------
MICHIGAN--2.5%
                   1,000   Detroit City School District,
                              Series 1998 B, 5.375%,
                              5/1/14 (FGIC)(3)                        1,060
                   1,000   Detroit Downtown Development
                              Auth. Tax Increment Rev.,
                              Series 1998 A, (Development
                              Area No. 1), 5.25%, 7/1/12
                              (MBIA)                                  1,048
                   1,500   Detroit Water Supply System Rev.,
                              Series 1995 A, 5.30%,
                              7/1/09 (MBIA)                           1,609
                                                                  ----------
                                                                      3,717
                                                                  ----------
MISSISSIPPI--0.7%
                   1,000   Harrison County GO, 5.00%,
                              7/1/12 (MBIA)                           1,047
                                                                  ----------
MISSOURI--0.7%
                   1,000   Missouri Board of Public
                              Buildings State Office Buildings
                              Special Obligation Rev., 6.30%,
                              12/1/05                                 1,069
                                                                  ----------
NEVADA--0.7%
                   1,000   Clark County Airport Rev.,
                              Series 1998 A, 5.50%,
                              7/1/07 (MBIA)                           1,096
                                                                  ----------

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
NEW JERSEY--3.8%
                  $1,030   Atlantic City Board of Education
                              GO, 6.00%, 12/1/02,
                              Prerefunded at 102% of Par
                              (AMBAC)(2)                           $  1,135
                   1,410   New Jersey Educational Facility
                              Auth. Rev., Series 1994 A,
                              (New Jersey Institute of
                              Technology), 5.90%, 7/1/08
                              (MBIA)                                  1,565
                   1,000   New Jersey Health Care Facilities
                              Financing Auth. Rev., (Atlantic
                              City Medical Center), 6.15%,
                              7/1/99                                  1,017
                   1,800   New Jersey Health Care Facilities
                              Financing Auth. Rev., (Rahway
                              Hospital Obligation Group),
                              5.00%, 7/1/05 (ACA)                     1,871
                                                                  ----------
                                                                      5,588
                                                                  ----------
NEW YORK--14.6%
                   1,950   City University of New York COP,
                              (John Jay College), 5.00%,
                              8/15/09 (AMBAC)                         2,050
                   2,500   Nassau County GO, Series 1996 T,
                              5.20%, 9/1/05 (FGIC)                    2,667
                   1,000   New York State Dormitory Auth.
                              Rev., (City University System),
                              6.00%, 7/1/03                           1,079
                   1,500   New York State Dormitory Auth.
                              Rev., Series 1995 A, (State
                              University Educational Facilities),
                              6.50%, 5/15/04                          1,673
                   1,000   New York State Dormitory Auth.
                              Rev., Series 1995 A, (State
                              University Educational Facilities),
                              6.50%, 5/15/06                          1,141
                   1,000   New York State Dormitory Auth.
                              Rev., Series 1996 E, (Mental
                              Health Service Facility), 6.00%,
                              8/15/04 (AMBAC)                         1,097
                     635   New York State Dormitory Auth.
                              Rev., Series 1998 I, (New York
                              Downtown Hospital), 4.80%,
                              2/15/06                                   650
                   1,000   New York State Dormitory Auth.
                              Rev., Series 1998-2, (City
                              University-3rd General Reserve),
                              5.00%, 7/1/16                             997
                   1,175   New York State GO, Series
                              1997 D, 5.25%, 8/1/03                   1,233
                   1,000   New York State GO, Series
                              1997 D, 5.25%, 8/1/06 (FGIC)            1,071
                   1,500   New York State Local Government
                              Assistance Corp. Rev., Series
                              1997 B, 5.25%, 4/1/04 (MBIA)            1,593

                                              See Notes to Financial Statements


16      1-800-345-2021


Intermediate-Term Tax-Free--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
                  $  890   New York State Medical Care
                              Facilities Finance Agency Rev.,
                              (Hospital and Nursing Home),
                              5.95%, 8/15/09 (FHA)                  $   940
                   1,000   New York State Thruway Auth.
                              Service Contract Rev., 5.30%,
                              4/1/04                                  1,053
                   1,000   New York State Thruway Auth.
                              Service Contract Rev., 5.50%,
                              4/1/04                                  1,063
                   1,160   New York State Thruway Auth.
                              Service Contract Rev., 5.50%,
                              4/1/06                                  1,244
                   1,000   New York State Urban
                              Development Corp. Rev., Series
                              1996 A, 6.25%, 4/1/05 (MBIA)            1,120
                   1,000   Niagara Falls Bridge Commission
                              Toll Rev., Series 1993 B,
                              5.25%, 10/1/15 (FGIC)                   1,066
                                                                  ----------
                                                                     21,737
                                                                  ----------
NORTH CAROLINA--1.5%
                   2,000   North Carolina Eastern Municipal
                              Power Agency System Rev.,
                              Series 1993 B, 6.00%,
                              1/1/06 (FSA)                            2,228
                                                                  ----------
OHIO--3.4%
                   1,200   Ohio Higher Educational Facility
                              Commission Rev., (University of
                              Dayton), 5.55%, 12/1/07
                              (FGIC)                                  1,310
                   3,320   Ohio Water Development Auth.
                              Pollution Control Facilities Rev.,
                              6.00%, 12/1/05 (MBIA)                   3,721
                                                                  ----------
                                                                      5,031
                                                                  ----------
OKLAHOMA--1.9%
                   2,500   Oklahoma Industrial Auth. Health
                              System Rev., Series 1995 C,
                              7.00%, 8/15/04 (AMBAC)                  2,862
                                                                  ----------
OREGON--1.4%
                   1,805   Lane County School District
                              No. 19 GO, (Springfield),
                              6.375%, 10/15/04,
                              Prerefunded at 101% of Par
                              (MBIA)(2)                               2,054
                                                                  ----------
PENNSYLVANIA--4.6%
                   1,500   Pennsylvania Turnpike
                              Commission Rev., Series
                              1991 L, 6.25%, 6/1/01
                              (AMBAC)                                 1,592
                   2,000   Philadelphia Gas Works Rev.,
                              14th Series, 5.70%, 7/1/00
                              (FSA)                                   2,067

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
                  $1,000   Philadelphia Parking Auth. Rev.,
                              5.50%, 9/1/04 (AMBAC)                $  1,074
                   2,000   Philadelphia Water and
                              Wastewater Rev., 5.15%,
                              6/15/04 (FGIC)                          2,110
                                                                  ----------
                                                                      6,843
                                                                  ----------
TENNESSEE--0.5%
                     760   Kingsport GO, (Sewer), 4.50%,
                              9/1/06 (MBIA)(3)                          780
                                                                  ----------
TEXAS--14.2%
                   1,000   Austin Rev., (Sub-Lien), 5.25%,
                              5/15/12 (MBIA)                          1,072
                   1,000   Austin Utility System Rev.,
                              5.125%, 11/15/16 (FSA)                  1,017
                   1,875   Brownsville Utility System Rev.,
                              6.00%, 9/1/08 (AMBAC)                   2,124
                   1,000   Dallas-Fort Worth Regional
                              Airport Rev., Series 1994 A,
                              5.90%, 11/1/08 (MBIA)                   1,094
                   1,000   Denison Hospital Auth. Rev.,
                              (Texoma Medical Center),
                              5.90%, 8/15/07 (ACA)                    1,106
                   1,500   Harris County Health Facilities
                              Development Corp. Hospital
                              Rev., (Memorial Hospital
                              System), 6.80%, 6/1/01(4)               1,613
                   1,000   North East Independent School
                              District Texas GO, 4.50%,
                              2/1/16 (Permanent School
                              Fund)                                     960
                     500   North Texas Higher Education
                              Student Loan Rev., 6.875%,
                              4/1/02 (AMBAC)                            527
                   1,440   Plano GO, 4.75%, 9/1/18                    1,405
                     500   San Antonio Electric & Gas Rev.,
                              Series 1998 A, 5.25%,
                              2/1/14(3)                                 522
                   1,325   Spring Independent School 
                              District GO, Series 1998
                              A, 4.60%, 8/15/13 (Permanent
                              School Fund)                            1,324
                   1,000   Tarrant County Health Facility
                              Development Corporation Health
                              System Rev., (Harris Methodist
                              Health System), 5.00%, 9/1/07
                              (AMBAC)(2)                              1,062
                   1,000   Texas GO, Series 1995 A, 6.50%,
                              10/1/03                                 1,116
                   2,000   Texas Municipal Power Agency
                              Rev., 5.75%, 9/1/02 (MBIA)              2,138
                   1,000   Texas Municipal Power Agency
                              Rev., 5.25%, 9/1/09 (MBIA)              1,079
                   1,500   Texas Public Finance Auth.
                              Building Rev., (Technical
                              College), 6.25%, 8/1/09
                              (MBIA)                                  1,732

See Notes to Financial Statements


                                                 www.americancentury.com      17


NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
                  $1,240   Upper Trinity Regional Water
                              District Rev., (Treated Water
                              Supply System), 5.25%,
                              8/1/12 (MBIA)                        $  1,284
                                                                  ----------
                                                                     21,175
                                                                  ----------
UTAH--2.2%
                   1,000   Salt Lake County Municipal
                              Building Auth. Lease Rev.,
                              Series 1994 A, 6.00%,
                              10/1/07 (MBIA)                          1,104
                   1,005   Utah Housing Finance Agency
                              Single Family Mortgage Rev.,
                              5.65%, 7/1/06                           1,073
                   1,000   Utah Municipal Finance Co-op
                              Local Government Rev.,
                              (University of Utah/University
                              Hospital), 6.60%, 5/15/00(2)            1,045
                                                                  ----------
                                                                      3,222
                                                                  ----------
WASHINGTON--13.6%
                   1,000   King County GO, Series 1998 B,
                              4.75%, 1/1/15                             994
                   1,000   Pierce County School District
                              No. 3 GO, Series 1992 B,
                              5.80%, 12/1/99                          1,026
                   1,000   Pierce County School District
                              No. 320 GO, 5.75%, 12/1/02              1,070
                   1,000   Port Seattle Passenger Facility
                              Charge Rev., Series 1998 B,
                              5.00%, 12/1/05 (AMBAC)                  1,048
                   2,435   Port Seattle Rev., Series 1997 B,
                              5.10%, 10/1/03 (FGIC)                   2,559
                   1,385   Port Tacoma Rev., 4.70%,
                              12/1/04 (AMBAC)                         1,433
                   2,000   Snohomish County Public Utility
                              District Rev., 5.625%, 1/1/05
                              (FGIC)                                  2,153
                   1,000   Snohomish County School
                              District No. 15 GO, 6.125%,
                              12/1/03                                 1,065
                   1,000   Spokane County School District
                              No. 356 GO, 6.00%, 12/1/06
                              (FGIC)                                  1,130
                   1,730   Tacoma Electric System Rev.,
                              6.00%, 1/1/07 (AMBAC)                   1,949
                   1,000   Tacoma Electric System Rev.,
                              6.10%, 1/1/07 (FGIC)                    1,108
                   1,000   Washington Health Care
                              Facilities Auth. Rev., (Harrison
                              Memorial Hospital), 5.25%,
                              8/15/14 (AMBAC)                         1,035

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
                  $1,000   Washington Public Power Supply
                              System Rev., Series 1990 B,
                              (Nuclear Project No. 1), 7.10%,
                              7/1/01 (FGIC)                        $  1,069
                   1,000   Washington Public Power Supply
                              System Rev., Series 1990 C,
                              (Nuclear Project No. 2), 7.30%,
                              7/1/00                                  1,056
                     500   Washington Public Power Supply
                              System Rev., Series 1990 C,
                              (Nuclear Project No. 2), 7.00%,
                              7/1/01 (FGIC)                             539
                   1,000   Washington Public Power Supply
                              System Rev., Series 1993 A,
                              (Nuclear Project No. 1), 5.50%,
                              7/1/04                                  1,069
                                                                  ----------
                                                                     20,303
                                                                  ----------
WEST VIRGINIA--0.8%
                   1,090   West Virginia GO, Series 1996 D,
                              5.00%, 11/1/10 (FGIC)                   1,143
                                                                  ----------
WISCONSIN--2.8%
                   2,590   Wisconsin Health and
                              Educational Facility Rev.,
                              (Aurora Medical Group), 6.00%,
                              11/15/10 (FSA)(4)                       2,984
                   1,060   Wisconsin Health and
                              Educational Facility Rev.,
                              Series 1991 B, (Wausau
                              Hospital), 6.30%, 8/15/00
                              (AMBAC)                                 1,107
                                                                  ----------
                                                                      4,091
                                                                  ----------
TOTAL MUNICIPAL SECURITIES                                          145,844
                                                                  ----------
   (Cost $138,836)

SHORT-TERM MUNICIPAL SECURITIES--2.0%
CALIFORNIA
                   3,000   San Francisco City and County
                              Airport Commission International
                              Airport Rev., Series 1998 A-48,
                              VRDN, 4.00%, 12/1/98
                              (Acquired 10/9/98-10/13/98,
                              Cost $3,000)(5)                         3,000
                                                                  ----------
   (Cost $3,000)

TOTAL INVESTMENT SECURITIES--100.0%                                $148,844
                                                                  ==========
   (Cost $141,836)

                                              See Notes to Financial Statements


18      1-800-345-2021


Intermediate-Term Tax-Free--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)

NOVEMBER 30, 1998 (UNAUDITED)

NOTES TO SCHEDULE OF INVESTMENTS

ACA = American Capital Access

AMBAC = AMBAC Assurance Corporation

COP = Certificates of Participation

FGIC = Financial Guaranty Insurance Co.

FHA = Federal Housing Authority

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GNMA = Government National Mortgage Association

GO = General Obligation

MBIA = MBIA Insurance Corp.

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted  average  portfolio  maturity.  Rate shown is effective
November 30, 1998.

(1)  Security is a zero-coupon municipal bond. The yield to maturity at purchase
     is  indicated.  Zero-coupon  securities  are  purchased  at  a  substantial
     discount from their value at maturity.

(2)  Escrowed  to  maturity  in U.S.  Government  securities  or state and local
     government securities.

(3) When-issued security.

(4)  Security,  or a portion thereof,  has been segregated at the custodian bank
     for a when-issued security.

(5)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement,  and unless registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate value of these securities at November 30, 1998, was $3,000, which
     represented 2.0% of net assets.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the percentage of investments in each state

* the percent and dollar breakdown of each investment category

See Notes to Financial Statements


                                                 www.americancentury.com      19


Long-Term Tax-Free--Performance
- --------------------------------------------------------------------------------
TOTAL RETURNS AS OF NOVEMBER 30, 1998
<TABLE>
                                INCEPTION 3/2/87
                      LONG-TERM     LEHMAN LONG-TERM     GENERAL MUNICIPAL DEBT FUNDS(2)
                       TAX-FREE   MUNICIPAL BOND INDEX   AVERAGE RETURN   FUND'S RANKING
- --------------------------------------------------------------------------------------
<S>               <C>              <C>            <C>                 <C>                  
6 MONTHS(1) .......      4.07%          4.10%               3.17%              --
1 YEAR ............      7.77%          8.74%               6.82%         22 OUT OF 240
- --------------------------------------------------------------------------------------
AVERAGE ANNUAL RETURNS
3 YEARS ...........      6.71%          8.02%               6.24%         51 OUT OF 198
5 YEARS ...........      6.49%          7.37%               5.82%         22 OUT OF 141
10 YEARS ..........      7.93%          9.33%               7.83%         33 OUT OF 74
</TABLE>
(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

See pages 46-47 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain chart - data below]

GROWTH OF $10,000 OVER 10 YEARS
Value on 11/30/98
Long-Term Tax-Free         $21,457
Lehman Long-Term
   Municipal Bond Index    $24,392

                       Long-Term           Lehman Long-Term
                        Tax-Free         Municipal Bond Index
DATE                     VALUE                  VALUE
11/30/88                $10,000                $10,000
11/30/89                $11,118                $11,307
11/30/90                $11,792                $12,160
11/30/91                $12,903                $13,545
11/30/92                $14,133                $15,087
11/30/93                $15,670                $17,097
11/30/94                $14,794                $15,397
11/30/95                $17,659                $19,353
11/30/96                $18,595                $20,646
11/30/97                $19,910                $22,432
11/30/98                $21,457                $24,392

$10,000 investment made 11/30/88

The chart at left shows the growth of a $10,000  investment  in the fund over 10
years,  while the chart below  shows the fund's  year-by-year  performance.  The
Lehman Long-Term  Municipal Bond Index is provided for comparison in each chart.
Long-Term  Tax-Free's  returns include  operating  expenses (such as transaction
costs and management  fees) that reduce returns,  while the returns of the index
do not. Past performance does not guarantee  future results.  Investment  return
and principal  value will  fluctuate,  and redemption  value may be more or less
than original cost.

[bar chart - data below]

ONE-YEAR RETURNS OVER 10 YEARS (PERIODS ENDED NOVEMBER 30)
                      Long-Term           Lehman Long-Term
                       Tax-Free         Municipal Bond Index
DATE                    RETURN                RETURN
11/30/89                11.18%                13.07%
11/30/90                 6.06%                 7.54%
11/30/91                 9.42%                11.39%
11/30/92                 9.54%                11.39%
11/30/93                10.87%                13.32%
11/30/94                -5.59%                -9.94%
11/30/95                19.37%                25.69%
11/30/96                 5.30%                 6.68%
11/30/97                 7.07%                 8.65%
11/30/98                 7.77%                 8.74%


20      1-800-345-2021


Long-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
/photo of Dave MacEwen/

     An  interview  with Dave  MacEwen,  a  portfolio  manager on the  Long-Term
Tax-Free fund investment team.

HOW DID THE FUND PERFORM DURING THE SIX MONTHS ENDED NOVEMBER 30, 1998?

     Long-Term Tax-Free  performed very well,  posting a 4.07% return,  compared
with the 3.17% average return of the 255 "General  Municipal Debt Funds" tracked
by Lipper Inc. Over the past five years,  the fund's returns placed in about the
top quarter of the peer group. (See the Total Returns table on the previous page
for other fund performance comparisons.)

     Long-Term  Tax-Free also produced  more  tax-free  current  income than the
average general municipal fund. The portfolio's  30-day SEC yield as of November
30 was 4.10%, compared with the 3.78% average yield of the peer group.

WHY DID THE FUND PERFORM SO WELL AGAINST ITS PEERS?

     One reason for the portfolio's strong performance was Long-Term  Tax-Free's
below-average expenses,  which gave us a head start on our competitors.  But the
primary  reason  was that the fund was  structured  to be  relatively  immune to
"calls," which occur when  municipal  issuers  refinance,  or "call away," their
older,  higher-rate debt as interest rates fall.  Calls are undesirable  because
they negatively affect a portfolio's duration.

CAN YOU DEFINE DURATION AND EXPLAIN HOW IT'S AFFECTED BY HOLDING CALLABLE BONDS

     Duration  measures a portfolio's  sensitivity to changes in interest rates.
The longer the  duration,  the more you gain when rates  fall,  and the more you
lose when rates rise.  Conversely,  a shorter  duration means a bond portfolio's
share price fluctuates less when rates change. So, ideally, you want to lengthen
duration  when  interest  rates are falling and shorten  duration when rates are
rising.

     One factor that affects a bond's  duration is whether it's  callable.  Like
homeowners, municipal issuers often refinance their debt when rates fall. In the
same way that home mortgage  refinancing shortens the life of a mortgage, a call
feature  effectively  shortens a bond's duration.  We wanted to protect the fund
from calls  because they have the exact  opposite  effect from what we want when
rates are falling. Having call protection helped us maintain the fund's duration
at around nine years, even as rates declined.

HOW DID YOU GUARD AGAINST CALLS?

     We used two strategies to insulate the fund from untimely calls.  First, we
increased  our  holdings  in  non-callable  bonds.  Non-callable  bonds can't be
redeemed by their issuers before  maturity.  Second,  we held a relatively large
stake in discount  bonds.  Discount  bonds trade below face value (par)  because
their  interest  coupons  are lower than  prevailing  market  rates.  Issuers of
discount bonds don't have much incentive to refinance bonds that carry interest

[right margin]

"OVER THE PAST FIVE YEARS, THE FUND'S RETURNS PLACED IN ABOUT THE TOP QUARTER
OF THE PEER GROUP."

YIELDS AS OF NOVEMBER 30, 1998
  30-DAY SEC YIELD
                                  4.10%
  30-DAY TAX-EQUIVALENT YIELDS
    28.0% TAX BRACKET             5.69%
    31.0% TAX BRACKET             5.94%
    36.0% TAX BRACKET             6.41%
    39.6% TAX BRACKET             6.79%

PORTFOLIO AT A GLANCE
                           11/30/98          5/31/98
NUMBER OF SECURITIES          73               71
WEIGHTED AVERAGE
  MATURITY                 19.0 YRS         18.2 YRS
AVERAGE DURATION            9.0 YRS          9.0 YRS
EXPENSE RATIO               0.51%*           0.51%*

* Annualized.

Investment terms are defined in the Glossary on page 47.


                                                 www.americancentury.com      21


Long-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

rates  lower than  prevailing  rates.  Premium  bonds,  on the other  hand,  pay
interest at a rate higher than  prevailing  rates and are much more likely to be
called.  As interest  rates  declined over the past six months,  discount  bonds
outperformed premium and even par bonds.

YOU MADE A SHIFT TOWARD HIGHER-QUALITY MUNICIPAL BONDS. WHY THE CHANGE?

     In our  opinion,  municipal  bonds  rated BBB didn't  really  offer  enough
additional  yield over  higher-rated  securities to  compensate  for their added
credit  risk (the risk that the issuer  would fail to make timely  interest  and
principal  payments).  At the end of  November,  for  example,  a BBB  municipal
security offered a yield of around 5.20%,  compared with the  highest-rated  AAA
security  with a yield of about  4.80%.  Looking at it  another  way, a AAA bond
offered  investors over 90% of the yield of a BBB bond, but with far less credit
risk.  Furthermore,  our outlook calls for slower economic growth in 1999, which
we believe will be most painful for lower-quality  municipal issuers. Given that
longer-term view, we felt it was prudent to begin to upgrade credit quality now.

WHY WAS THERE SUCH A SMALL YIELD DIFFERENCE BETWEEN BBB AND AAA MUNICIPAL BONDS

     The  reason  lower-rated  bonds  currently  offer  only a small  amount  of
additional yield boils down to a simple case of demand outstripping  supply. The
supply of BBB bonds has  diminished  in part because many issuers have  received
credit  upgrades  during the past couple of years.  In  addition,  more and more
municipal  issuers now obtain  insurance--guaranteeing  the timely  payment of a
bond's  interest  and  principal--and  receive a AAA rating in the  process.  An
increase in the number of insured  municipal bonds has reduced the supply of BBB
bonds. And in a falling interest rate  environment--as  we've seen over the past
couple of  years--higher-yielding,  lower-rated  bonds were in high demand among
investors  searching  for yield.  Stronger  demand and lower supply meant higher
prices and lower yields for BBB securities.

HOW DID LONG-TERM TAX-FREE'S ALLOCATION TO VARIOUS STATES CHANGE DURING THE PAST
SIX MONTHS?

     The changes were a function of where we found the best value for individual
bonds  with the  structural  characteristics  we  wanted,  such as  discount  or
non-callable bonds. During the past six months, we cut our holdings in New York,
in large  part  because  of its  exposure  to the  somewhat  troubled  financial
services industry,  and Massachusetts,  where municipal prices had gotten rather
expensive.  We used the  proceeds  from those sales to purchase  bonds issued in
Texas,  Washington,  and Illinois  when supply was quite heavy and, as a result,
prices were cheap relative to other parts of the nation.

[left margin]

TOP FIVE STATES (AS OF 11/30/98)
                   % OF FUND INVESTMENTS
TEXAS                      14.5%
WASHINGTON                  9.7%
ILLINOIS                    9.4%
FLORIDA                     8.1%
NEW YORK                    8.1%

TOP FIVE STATES (AS OF 5/31/98)
                   % OF FUND INVESTMENTS
CALIFORNIA                 14.0%
ILLINOIS                   12.2%
NEW YORK                    9.7%
MASSACHUSETTS               7.9%
FLORIDA                     7.8%

PORTFOLIO COMPOSITION BY CREDIT RATING
              % OF FUND INVESTMENTS
             AS OF             AS OF
           11/30/98           5/31/98
AAA           64%               54%
AA            28%               32%
A              7%               13%
BBB            1%                1%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 46
for more information.


22      1-800-345-2021


Long-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

WHAT'S YOUR OUTLOOK FOR THE MUNICIPAL BOND MARKET?

     We're  quite  optimistic  about the  prospects  for  municipal  bonds for a
variety of reasons. In our view, the interest rate backdrop will remain positive
over the  next six  months.  Inflation  is  nearly  non-existent,  rising  at an
annualized  rate of just 1.5% for the year ended November 30, 1998. In addition,
prolonged economic  challenges in Asia, Russia, and Latin America --coupled with
a continued absence of inflation here at home--could  prompt the Federal Reserve
to further cut interest rates in order to stimulate the world economy.

     But even if interest  rates remain stable,  we think that  municipal  bonds
could do well. Municipals lagged Treasurys in 1998 because of unfavorable supply
and demand (see the Market Perspective on page 4). We expect the supply of newly
issued municipals to decline substantially over the next year, in stark contrast
to the near-record-breaking supply of municipals issued in 1998. On the opposite
side of the equation,  we believe that demand for  municipal  bonds will grow in
the months ahead.  That's because  municipals are as cheap relative to Treasurys
as they have been in nearly a decade--yields on some longer-term municipal bonds
are equal to or only  slightly  lower than the fully taxable  yields  offered by
Treasurys.

     Because yields and bond prices move in the opposite  direction,  municipals
could gain significant  ground if their yields move from the current 90%-100% of
Treasurys down to their  historical  average of close to 80% of Treasury yields.
In our view,  it's just a matter of when,  not if,  investors  realize the value
municipals currently offer.

WITH THAT OUTLOOK IN MIND,  WHAT ARE YOUR PLANS FOR LONG-TERM  TAX-FREE OVER THE
NEXT SIX MONTHS?

     We're comfortable sticking with the fund's current  positioning.  Unless we
feel that  inflationary  pressures  are  building  and that  interest  rates are
threatening to rise, we're likely to keep the fund's duration  slightly long and
continue to emphasize  discount  bonds.  If, on the other hand,  interest  rates
appear  poised to move higher,  we would  probably  begin to sell some  discount
bonds  in favor of par and  premium  bonds.  And  given  our view  that the U.S.
economy  will  slow,  we're  likely  to  continue  to  emphasize  higher-quality
investments.

[right margin]

"WE'RE QUITE OPTIMISTIC ABOUT THE PROSPECTS FOR MUNICIPAL BONDS FOR A VARIETY
OF REASONS."

TOP FIVE SECTORS (AS OF 11/30/98)
                            % OF FUND INVESTMENTS
ELECTRIC REVENUE                      23%
GO                                    15%
PREREFUNDED/ETM                       15%
WATER AND SEWER REVENUE               13%
HOSPITAL REVENUE                       5%

TOP FIVE SECTORS (AS OF 5/31/98)
                            % OF FUND INVESTMENTS
ELECTRIC REVENUE                      23%
PREREFUNDED/ETM                       17%
WATER AND SEWER REVENUE               13%
HIGHER EDUCATION                       6%
SALES TAX REVENUE                      5%

Security types are defined on page 47.


                                                 www.americancentury.com      23


Long-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                           Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--95.2%
CALIFORNIA--5.8%
                   $1,000  California Public Works Lease
                              Rev., Series 1994 A, (University
                              Project), 6.20%, 10/1/08             $  1,121
                    1,500  Los Angeles Community
                              Redevelopment Agency Tax
                              Allocation, Series 1993 H,
                              (Bunker Hill), 6.50%, 12/1/14
                              (FSA)                                   1,698
                    1,500  Metropolitan Water District of
                              Southern California Waterworks
                              Rev., Series 1993 A, 5.75%,
                              7/1/21                                  1,694
                    1,850  Northern California Power
                              Agency Rev., Series 1992 A,
                              (Hydroelectric Project #1),
                              6.25%, 7/1/12 (MBIA)                    2,031
                    1,000  San Jose Redevelopment Agency
                              Tax Allocation, Series 1993 D,
                              (Merged Area Redevelopment),
                              5.75%, 8/1/24                           1,064
                                                                  ----------
                                                                      7,608
                                                                  ----------
CONNECTICUT--2.5%
                    1,880  Connecticut Development Auth.
                              Rev., Series 1994 A, 6.375%,
                              10/15/24                                2,108
                    1,000  Connecticut GO, Series 1993 E,
                              6.00%, 3/15/12                          1,155
                                                                  ----------
                                                                      3,263
                                                                  ----------
DISTRICT OF COLUMBIA--3.4%
                    1,000  District of Columbia Metropolitan
                              Area Transportation Auth. Rev.,
                              6.00%, 7/1/10 (FGIC)                    1,144
                    3,000  District of Columbia Water and
                              Sewer Auth. Public Utility Rev.,
                              5.50%, 10/1/23 (FSA)                    3,244
                                                                  ----------
                                                                      4,388
                                                                  ----------
FLORIDA--6.4%
                      820  Broward County Resource
                              Recovery Facility Rev., (South),
                              7.95%, 12/1/08                            874
                    1,000  Orlando Utility Commission Water
                              and Electric Rev., Series
                              1989 D, 6.75%, 10/1/17                  1,225
                    1,000  St. Petersburg Health Auth. Rev.,
                              (Allegany Health), 7.00%,
                              12/1/01, Prerefunded at
                              102% of Par (MBIA)(1)                   1,113
                    1,350  Tampa Sports Auth. Sales Tax Rev.,
                              (Tampa Bay Arena), 5.75%,
                              10/1/25 (MBIA)                          1,534

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
                   $3,640  Village Center Community
                              Development District
                              Recreational Rev., Series
                              1998 A, 4.75%, 11/1/22
                              (MBIA)                               $  3,525
                                                                  ----------
                                                                      8,271
                                                                  ----------
GEORGIA--0.9%
                    1,000  Georgia Municipal Electric Auth.
                              Rev., 6.50%, 1/1/12 (MBIA)              1,184
                                                                  ----------
ILLINOIS--9.4%
                    1,000  Chicago Gas Supply Rev., Series
                              1985 B, (Peoples Gas), 7.50%,
                              3/1/15                                  1,063
                    1,000  Cook County GO, 7.00%,
                              11/1/00, Prerefunded at 102%
                              of Par (MBIA)(1)                        1,084
                    2,000  Illinois Dedicated Tax Rev., (Civic
                              Center), 6.25%, 12/15/20
                              (AMBAC)                                 2,345
                    1,500  Illinois Development Finance Auth.
                              Pollution Control Rev., Series
                              1990 A, (Central Illinois Public
                              Service), 7.60%, 3/1/14                 1,590
                    1,000  Illinois Development Finance Auth.
                              Waste Disposal Rev., (Armstrong
                              World Industries), 5.95%,
                              12/1/24                                 1,121
                    1,500  Illinois GO, 6.25%, 10/1/06                1,647
                    1,140  Illinois Health Facilities Auth. Rev.,
                              Series 1992 C, (Evangelical
                              Hospital), 6.75%, 4/15/12               1,360
                      700  Illinois Health Facilities Auth. Rev.,
                              Series 1992 C, (Evangelical
                              Hospital), 6.75%, 4/15/02,
                              Prerefunded at 102% of Par(1)             778
                    1,000  Illinois Regional Transportation
                              Auth. Rev., Series 1990 A,
                              7.20%, 11/1/20 (AMBAC)                  1,313
                                                                  ----------
                                                                     12,301
                                                                  ----------
INDIANA--1.8%
                    1,000  Indiana Municipal Power 
                              Agency Rev., Series 1990
                              A, 7.10%, 1/1/00, Prerefunded at 102%
                              of Par (AMBAC)(1)                       1,060
                    1,000  Indiana Transportation Financing
                              Auth. Highway Rev., Series
                              1990 A, 7.25%, 6/1/15                   1,275
                                                                  ----------
                                                                      2,335
                                                                  ----------
KANSAS--0.9%
                    1,000  Kansas City Utility System Rev.,
                              6.375%, 9/1/23 (FGIC)                   1,129
                                                                  ----------

                                              See Notes to Financial Statements


24      1-800-345-2021


Long-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
KENTUCKY--0.9%
                   $1,000  Carroll County Pollution Control
                              Rev., Series 1992 A, (Kentucky
                              Utilities Company), 7.45%,
                              9/15/16                              $  1,130
                                                                  ----------
MASSACHUSETTS--7.2%
                    1,000  Massachusetts Health and
                              Education Auth. Rev., Series
                              1992 F, 6.25%, 7/1/12
                              (AMBAC)                                 1,155
                    1,690  Massachusetts Housing Finance
                              Agency Rev., Series 1993 H,
                              6.75%, 11/15/12 (FNMA)                  1,830
                    2,800  Massachusetts Water Resource
                              Auth. Rev., Series 1993 C,
                              4.75%, 12/1/23 (MBIA)(2)                2,674
                    4,000  Massachusetts Water Resource
                              Auth. Rev., Series 1998 B,
                              4.50%, 8/1/22 (FSA)                     3,753
                                                                  ----------
                                                                      9,412
                                                                  ----------
MICHIGAN--5.4%
                    2,000  Detroit City School District GO,
                              Series 1998 C, 5.25%, 5/1/25
                              (FGIC)(3)                               2,108
                    2,000  Detroit Downtown Development
                              Auth. Tax Increment Rev., Series
                              1998 A, (Development Area
                              No. 1), 4.75%, 7/1/25 (MBIA)            1,920
                    1,020  Paw Paw Public School District
                              GO, 5.00%, 5/1/25 (FGIC)                1,037
                    2,000  Redford Unified School District
                              GO, 5.00%, 5/1/22
                              (AMBAC)(2)                              2,032
                                                                  ----------
                                                                      7,097
                                                                  ----------
NEW YORK--6.4%
                    2,000  Long Island Power Auth.
                              Electrical System Rev., Series
                              1998 A, 5.75%, 12/1/24                  2,151
                    1,000  Municipal Assistance Corp. Rev.,
                              Series 67, 7.625%, 7/1/99,
                              Prerefunded at 102% of Par(1)           1,046
                    3,000  New York City Transitional Finance
                              Auth. Rev., Series 1998 C,
                              4.75%, 5/1/23                           2,893
                    1,000  New York State Environmental
                              Facilities Corp. Pollution Control
                              Rev., Series 1991 E, 6.30%,
                              6/15/01, Prerefunded at
                              102% of Par(1)                          1,083
                    1,000  New York State Local Government
                              Assistance Corp. Rev., Series
                              1991 D, 6.75%, 4/1/02,
                              Prerefunded at 102% of Par(1)           1,112
                                                                  ----------
                                                                      8,285
                                                                  ----------

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
NORTH CAROLINA--2.3%
                   $2,000  North Carolina Medical Care
                              Community Health Facilities
                              Rev., Series 1998 B, (Duke
                              University Health System),
                              4.75%, 6/1/21                        $  1,911
                    1,000  North Carolina Municipal Power
                              Agency #1 Rev., (Catawba
                              Electric), 6.00%, 1/1/10 (MBIA)         1,138
                                                                  ----------
                                                                      3,049
                                                                  ----------
OHIO--1.4%
                      750  Ohio Higher Educational Facility
                              Rev., Series 1990 B (Case
                              Western Reserve University),
                              6.50%, 10/1/20                            905
                    1,000  Washington County Hospital Rev.,
                              (Marietta Area Health), 4.50%,
                              9/1/23 (FSA)                              925
                                                                  ----------
                                                                      1,830
                                                                  ----------
PENNSYLVANIA--0.8%
                    3,725  Harrisburg GO, Series 1997 F,
                              5.52%, 9/15/22 (AMBAC)(4)               1,104
                                                                  ----------
PUERTO RICO--3.0%
                    3,550  Puerto Rico Commonwealth GO,
                              4.50%, 7/1/23                           3,312
                      500  Puerto Rico Commonwealth GO,
                              6.45%, 7/1/04, Prerefunded at
                              101.5% of Par(1)                          572
                                                                  ----------
                                                                      3,884
                                                                  ----------
RHODE ISLAND--3.9%
                    1,100  Rhode Island Clean Water Safe
                              Drinking Rev., 6.70%, 1/1/15
                              (AMBAC)                                 1,258
                    2,000  Rhode Island Depositors Economic
                              Protection Corp. Special
                              Obligation Rev., Series 1993 A,
                              6.25%, 8/1/16 (MBIA)(2)                 2,336
                    1,300  Rhode Island Depositors Economic
                              Protection Corp. Special
                              Obligation Rev., Series 1993 B,
                              6.00%, 8/1/17 (MBIA)                    1,430
                                                                  ----------
                                                                      5,024
                                                                  ----------
SOUTH CAROLINA--3.8%
                    2,000  Charleston Waterworks & Sewer
                              Rev., (Capital Improvements),
                              4.50%, 1/1/24 (FGIC)                    1,870
                      860  Piedmont Municipal Power Agency
                              Electric Rev., Series 1991 A,
                              6.50%, 1/1/16 (FGIC)                    1,033
                      140  Piedmont Municipal Power Agency
                              Electric Rev., Series 1991 A,
                              6.50%, 1/1/16 (FGIC)                      168

See Notes to Financial Statements


                                                 www.americancentury.com      25


Long-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
                   $1,500  Piedmont Municipal Power Agency
                              Electric Rev., 6.75%, 1/1/19
                              (FGIC)                               $  1,853
                                                                  ----------
                                                                      4,924
                                                                  ----------
TEXAS--14.5%
                    1,000  Alliance Airport Auth. Special
                              Facilities Rev., (American
                              Airlines), 7.00%, 12/1/11
                              (GTEED)                                 1,182
                    1,000  Denton Utility System Rev.,
                              Series 1996 A, 5.95%,
                              12/1/14 (MBIA)                          1,110
                    6,560  Lower Colorado River Auth. Rev.,
                              (Seventh Supply Series), 4.50%,
                              1/1/17 (FSA)                            6,266
                    5,600  San Antonio Electric and Gas Rev.,
                              Series 1988 A, 4.50%,
                              2/1/21(3)                               5,238
                    2,000  San Antonio Electric and Gas
                              System Rev., 7.10%, 2/1/09
                              (FGIC)(1)(4)                            1,278
                    1,000  Tarrant County Health Facility Rev.,
                              6.00%, 5/15/11 (MBIA)                   1,137
                    2,500  Texas Municipal Power Agency
                              Rev., Series 1991 A, 6.75%,
                              9/1/12 (AMBAC)                          2,730
                                                                  ----------
                                                                     18,941
                                                                  ----------
UTAH--1.0%
                    1,000  Salt Lake City Hospital Rev.,
                              Series 1988 A, (Intermountain
                              Health Corporation), 8.125%,
                              5/15/15                                 1,315
                                                                  ----------
VIRGINIA--0.9%
                    1,000  Hampton Industrial Development
                              Auth. Rev., Series 1994 A,
                              (Sentara General Hospital),
                              6.50%, 11/1/12                          1,125
                                                                  ----------
WASHINGTON--9.7%
                    7,000  King County GO, Series 1998 B,
                              5.25%, 1/1/34 (MBIA)(2)                 7,103
                    1,405  Port of Seattle Rev., 7.50%,
                              12/1/00, Prerefunded at
                              102% of Par (AMBAC)(1)                  1,540
                    1,625  Seattle Metropolitan Sewer Rev.,
                              Series 1991 T, 6.875%,
                              1/1/00, Prerefunded at 102%
                              of Par(1)                               1,718

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
                   $1,000  Washington GO, Series 1990 A,
                              6.75%, 2/1/15                        $  1,227
                    1,000  Washington Public Power Supply
                              Rev., Series 1996 A, (Nuclear
                              Project #1), 5.75%, 7/1/12
                              (MBIA)                                  1,091
                                                                  ----------
                                                                     12,679
                                                                  ----------
WISCONSIN--2.9%
                    1,180  Winneconne Community School
                              District GO, 6.75%, 4/1/14
                              Prerefunded at 100% of Par
                              (FGIC)(1)                               1,380
                    1,900  Wisconsin Clean Water Rev.,
                              6.875%, 6/1/11                          2,333
                                                                  ----------
                                                                      3,713
                                                                  ----------
TOTAL MUNICIPAL SECURITIES                                          123,991
                                                                  ----------
   (Cost $115,217)

SHORT-TERM MUNICIPAL SECURITIES--3.4%
FLORIDA--1.7%
                    2,200  Tampa Sports Auth. Rev. Trust
                              Receipts, VRDN, 3.45%,
                              12/1/98 (MBIA) (SBBPA:
                              Societe Generale) (Acquired
                              11/12/98, Cost $2,200)(5)               2,200
                                                                  ----------
NEW YORK--1.7%
                    2,200  New York Energy Research &
                              Development Auth. Pollution
                              Control Rev., Series 1985 A,
                              (Niagara Mohawk Power),
                              VRDN, 3.75%, 12/2/98
                              (LOC: Toronto-Dominion Bank)            2,200
                                                                  ----------
TOTAL SHORT-TERM MUNICIPAL SECURITIES                                 4,400
                                                                  ----------
   (Cost $4,400)

TEMPORARY CASH INVESTMENTS--1.4%
                    1,795  Units of Participation in Chase
                              Vista Tax-Free Money Market
                              Fund (Institutional Shares)             1,795
                                                                  ----------
   (Cost $1,795)

TOTAL INVESTMENT SECURITIES--100.0%                                $130,186
                                                                  ==========
   (Cost $121,412)

                                              See Notes to Financial Statements


26      1-800-345-2021


Long-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)

NOVEMBER 30, 1998 (UNAUDITED)

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Indemnity Corporation

FGIC = Financial Guaranty Insurance Co.

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GO = General Obligation

GTEED = Connecticut General Life Guaranty Agreement

LOC = Letter of Credit

MBIA = MBIA Insurance Corporation

SBBPA = Standby Bond Purchase Agreement

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted  average  portfolio  maturity.  Rate shown is effective
November 30, 1998.

(1)  Escrowed to maturity in U.S. government securities or state and local
     securities.

(2)  Security,  or a portion thereof,  has been segregated at the custodian bank
     for a when-issued security.

(3)  When-issued security.

(4)  Security is a zero coupon municipal bond. The yield to maturity at purchase
     is  indicated.  Zero-coupon  securities  are  purchased  at  a  substantial
     discount from from their value at maturity.

(5)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement and, unless  registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate value of restricted  securities at November 30, 1998, was $2,200,
     which represented 1.8% of net assets.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the percent and dollar breakdown of each investment category

See Notes to Financial Statements


                                                 www.americancentury.com      27


High-Yield Municipal--Performance
- --------------------------------------------------------------------------------
TOTAL RETURNS AS OF NOVEMBER 30, 1998
<TABLE>
                                      INCEPTION 3/31/98
               HIGH-YIELD    LEHMAN LONG-TERM    HIGH CURRENT YIELD MUNICIPAL FUNDS(2)
              MUNICIPAL(3)    MUNI BOND INDEX   AVERAGE RETURN   # OF FUNDS IN CATEGORY
- --------------------------------------------------------------------------------------
RETURNS
<S>               <C>             <C>               <C>                   <C>
6 MONTHS(1)       4.20%           4.10%             2.57%                 56
LIFE OF FUND      6.08%           5.56%             3.61%                 56
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Management fees have been waived through April 30, 1999.  Returns would have
    been lower if fees had not been waived.

See pages 46-47 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain chart - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 11/30/98
High-Yield Municipal        $10,608
Lehman Long-Term
   Municipal Bond Index     $10,557

                     High-Yield          Lehman Long-Term
                      Municipal        Municipal Bond Index
DATE                    VALUE                  VALUE
3/31/98                $10,000                $10,000
4/30/98                 $9,994                 $9,946
5/31/98                $10,181                $10,141
6/30/98                $10,276                $10,187
7/31/98                $10,300                $10,210
8/31/98                $10,469                $10,393
9/30/98                $10,607                $10,537
10/31/98               $10,563                $10,504
11/30/98               $10,608                $10,557

$10,000 investment made 3/31/98

The chart at left shows the growth of a $10,000  investment over the life of the
fund.  The Lehman  Long-Term  Muni Bond Index is provided for  comparison.  Past
performance does not guarantee future results.  Investment  return and principal
value will  fluctuate,  and  redemption  value may be more or less than original
cost.


28      1-800-345-2021


High-Yield Municipal--Q&A
- --------------------------------------------------------------------------------
/photo of Joel Silva and Steven Permut/

     An interview with Joel Silva and Steven Permut,  portfolio  managers on the
High-Yield Municipal fund investment team.

HOW DID THE  HIGH-YIELD  MUNICIPAL  FUND  PERFORM  DURING THE SIX  MONTHS  ENDED
NOVEMBER 30, 1998?

     The fund  performed  very well.  For the six months,  High-Yield  Municipal
returned 4.20%, while the average return of the 56 "High-Yield  Municipal Funds"
tracked by Lipper Inc. was 2.57%.  Since its  inception  on March 31, 1998,  the
portfolio has returned  6.08%,  compared  with the 3.61%  average  return of the
Lipper group.  (See the Total Returns table on the previous page for  additional
performance comparisons.)

HOW DOES THE PORTFOLIO'S YIELD COMPARE WITH THE PEER GROUP?

     High-Yield  Municipal  produced more federal  tax-free income than the peer
group average. As of November 30, the portfolio had a 30-day SEC yield of 5.34%.
By comparison, the average municipal high-yield fund yielded 4.43%, according to
Lipper.

     The  fund's  yield  is  even  more   impressive  on  an  after-tax   basis.
Tax-equivalent  yields  ranged  from 7.42% for an  investor  in the 28%  federal
income tax  bracket  to 8.84% for a taxpayer  in the  highest  bracket  (see the
Yields table at right for additional  tax-equivalent yields). However, a portion
of fund  income  will be taxable  for  shareholders  who file under the  federal
alternative  minimum tax (AMT).  Investors should also keep in mind that capital
gains are not tax exempt.

WHAT'S BEHIND HIGH-YIELD MUNICIPAL'S EXCELLENT PERFORMANCE SO FAR?

     First,  we pulled  together an experienced  team of portfolio  managers and
credit analysts  who've had success in both the high-yield and  investment-grade
portions of the market.  Second, we've waived expenses for the fund's first year
of  existence.  Other  things  being  equal,  lower fees mean higher  yields and
returns for our shareholders.

HOW DOES THE CREDIT TEAM HELP IN MANAGING THE FUND?

     We put together the  portfolio  using a very  credit-intensive  approach to
security selection, trying to provide the best combination of yields and returns
while minimizing risk. To do that, we rely on our team of experienced  municipal
credit  analysts,  who do  extensive  financial  and  demographic  analysis  and
frequently  conduct  site visits to  determine a  security's  value.  The team's
hands-on  approach  helps us sift through the  universe of available  credits to
find what we consider to be diamonds in the rough.

     But our credit  team  doesn't  work solely in a passive,  analytical  role.
Instead,  our analysts roll up their sleeves and work directly with bond issuers
to structure deals to our liking.  That means we're able to have some input on a
bond's  creditworthiness,  its maturity and call provisions,  and its yield. The
key is that  we're  able to get in on some of these  deals  before the bonds are
issued to get more credit protection for our shareholders.

[right margin]

"WE'VE WAIVED MANAGEMENT FEES THROUGH APRIL 30, 1999. OTHER THINGS BEING EQUAL,
LOWER FEES MEAN HIGHER YIELDS  AND RETURNS FOR OUR SHAREHOLDERS."

YIELDS AS OF NOVEMBER 30, 1998
  30-DAY SEC YIELD
                                   5.34%
  30-DAY TAX-EQUIVALENT YIELDS
    28.0% TAX BRACKET              7.42%
    31.0% TAX BRACKET              7.74%
    36.0% TAX BRACKET              8.34%
    39.6% TAX BRACKET              8.84%

Yields would have been 4.70%, 6.53%, 6.81%, 7.34%, and 7.78%,  respectively,  if
management fees had not been waived.

PORTFOLIO AT A GLANCE
                            11/30/98         5/31/98
NUMBER OF SECURITIES          41               35
WEIGHTED AVERAGE
  MATURITY                 17.0 YRS         19.4 YRS
AVERAGE DURATION            7.4 YRS          7.3 YRS
EXPENSE RATIO               0.00%*           0.00%*

* Fund expenses of approximately 0.64% are being waived through April 30, 1999.

Investment terms are defined in the Glossary on page 47.


                                                 www.americancentury.com      29


High-Yield Municipal--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

YOU ALSO MENTIONED THE FEE WAIVER. CAN YOU EXPLAIN A LITTLE ABOUT THAT?

     We've waived  management fees through April 30, 1999. The waiver was a good
way for us to provide  shareholders  competitive yields and returns right out of
the gate. Many of our  competitors  hold bonds purchased in higher interest rate
environments,  so their yields were likely to be higher than yields on new bonds
we can  purchase  today,  when  rates are  relatively  low.  Over  time,  as our
competitors'  higher-yielding  bonds  mature or are  called  away and we have an
opportunity to purchase higher-yielding bonds in the secondary market, any yield
advantage they have should disappear.

     And we should  point  out that  even  without  the fee  waiver,  High-Yield
Municipal's   expense  ratio  of  approximately   0.64%  should  be  well  below
average--according  to Lipper,  the average  high-yield  municipal  fund charged
annual expenses of 1.15% as of November 30, 1998.

HOW DID YOU MANAGE DURATION OVER THE LAST SEVERAL MONTHS?

     We  generally  expect  to keep the  duration--a  measure  of a bond  fund's
sensitivity  to changes in  interest  rates--in  a range  between  six and eight
years.  When  interest  rates were  declining  through about early  October,  we
boosted returns by keeping  duration at the long end of that range. But when the
rally topped out, it seemed like a good idea to shorten duration.  The timing of
that trade was good--we shortened duration to about 7.5 years before rates began
to rise in late October and November.  Those  adjustments to duration helped the
fund's performance relative to the peer group for the last six months.

THERE'S BEEN SOME DISCUSSION IN THE NEWS ABOUT MUNICIPAL CREDIT QUALITY. WHAT'S
YOUR VIEW OF CREDIT QUALITY?

     Credit quality made the headlines in July when Allegheny Health,  Education
and Research Foundation, or AHERF, a municipal high-yield bond issuer, filed for
bankruptcy.  We had no exposure to AHERF  bonds.  It was a credit we'd looked at
but decided not to buy because it failed to meet our strict credit criteria.

     The AHERF  default  aside,  we think  municipal  credit  quality in general
plateaued in 1998.  There's some uncertainty  heading into 1999 because economic
turmoil in Asia and Latin America has reduced foreign demand for U.S. goods. But
we think it's unlikely the U.S. economy will slow  dramatically.  That's because
consumer  spending,  which  accounts for about  two-thirds  of economic  growth,
remains strong.

     But the  default and  worries  about the  economy did cause the spread,  or
difference in yield,  between lower-rated and AAA bonds to increase.  When yield
spreads  widen,   lower-rated   bonds  typically   underperform   higher-quality
securities.  Spread widening was most pronounced among tax-free corporate-backed
bonds,  which tend to be more  sensitive  to changes in credit  quality  and the
economy.  But again,  we held  relatively few of these bonds, so we held up well
when compared with some of our competitors.

[left margin]

". . .EVEN WITHOUT THE FEE WAIVER, HIGH-YIELD MUNICIPAL'S EXPENSE RATIO OF
APPROXIMATELY 0.64% SHOULD BE WELL BELOW AVERAGE."

PORTFOLIO COMPOSITION BY CREDIT RATING
               % OF FUND INVESTMENTS
               AS OF            AS OF
             11/30/98           5/31/98
AAA            19%                8%
AA              3%               11%
A               4%               16%
BBB            22%               26%
BB              6%                9%
UNRATED        46%               30%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 46
for more information.

"WE THINK MUNICIPAL CREDIT QUALITY IN GENERAL PLATEAUED IN 1998."


30      1-800-345-2021


High-Yield Municipal--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

HOW DID YOU MANAGE HIGH-YIELD MUNICIPAL'S CREDIT QUALITY?

     We  typically  expect to keep  around  40-60% of assets in  lower-rated  or
un-rated high-yield  bonds--at the end of November,  we were right in the middle
of that range. In addition, we diversified these holdings so we're not tied to a
single  sector,  economic  trend,  or  geographic  region.  For example,  we own
land-based bonds in Florida, a shopping mall bond in New Jersey, and an aquarium
bond in Oregon--bonds that are impacted by different economic factors and have a
very low correlation.

     Within our  investment-grade  bonds  (securities rated AAA, AA, A, or BBB),
we've  traded  up in  credit  quality,  selling  some of our  more  economically
sensitive issues and lower-rated bonds and buying more AAA debt. Here again, the
timing of that  trade was  pretty  good,  because  yield  spreads  for BBB bonds
widened a little in the late summer and fall.

WHAT'S YOUR OUTLOOK FOR THE MUNICIPAL MARKET FOR THE NEXT SIX MONTHS?

     We like the outlook for municipal bonds in general for a number of reasons.
Inflation  rose at the  slowest  annual pace in a dozen years for the year ended
November 30, 1998.  With inflation so low and the economy  facing  pressure from
global economic  turmoil,  we believe the Federal  Reserve  probably has room to
lower interest rates even further.

     Supply and demand  factors also look positive  going  forward.  As interest
rates declined this year, many municipalities refinanced their older debt at the
new lower rate. All that new supply limited  municipal bonds' gains in 1998. But
bonds can only be  refinanced a limited  number of times,  so we should see less
supply going  forward.  Meanwhile,  demand for  municipal  bonds is likely to be
strong because municipals are very attractively valued relative to Treasurys.

GIVEN THAT OUTLOOK,  WHAT ARE YOUR PLANS FOR  HIGH-YIELD  MUNICIPAL FOR THE NEXT
SIX MONTHS?

     We're going to continue to work to give  investors more  tax-exempt  income
and  potentially  greater  returns  than they could earn with an  investment  in
higher-quality municipal bonds. To do that, we'll stick by our target of keeping
40-60% of assets in what we consider to be attractively valued high-yield bonds.
Central to that approach will be our use of careful credit analysis and security
selection  to find what we think are the best  bonds in the  market.  That's the
same strategy that's helped the fund to such a solid start.

[right margin]

"WE'RE GOING TO CONTINUE TO WORK TO GIVE INVESTORS MORE TAX-EXEMPT INCOME AND
POTENTIALLY GREATER RETURNS THAN THEY COULD EARN WITH AN INVESTMENT IN
HIGHER-QUALITY MUNICIPAL BONDS."

TOP FIVE SECTORS (AS OF 11/30/98)
                             % OF FUND INVESTMENTS
LAND-SECURED                           21%
HOSPITAL REVENUE                       20%
GO                                     11%
TRANSPORTATION REVENUE                  9%
ELECTRIC REVENUE                        7%

Security types are defined on page 47.

TOP FIVE STATES (AS OF 11/30/98)
                             % OF FUND INVESTMENTS
CALIFORNIA                             22%
PENNSYLVANIA                           10%
FLORIDA                                 8%
ALASKA                                  5%
OREGON                                  5%


                                                 www.americancentury.com      31


High-Yield Municipal--Schedule of Investments
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--90.5%
ALASKA--6.0%
                   $  660  Alaska Industrial Development &
                              Export Auth. Power Rev.,
                              (Upper Lynn Canal Regional
                              Power), 5.80%, 1/1/18                  $  664
                    1,800  Alaska Industrial Development &
                              Export Auth. Power Rev.,
                              (Upper Lynn Canal Regional
                              Power), 5.875%, 1/1/32                  1,811
                                                                   ---------
                                                                      2,475
                                                                   ---------
CALIFORNIA--14.5%
                      650  Poway Community Facilities
                              District Special Tax, (No. 88-1,
                              Parkway Business Center),
                              6.75%, 8/15/15                            714
                    1,000  Riverside Unified School District
                              COP, (School Facility Boarding
                              Refunding Program), 3.85%,
                              9/1/01 (FSA)(SBBPA:
                              First Union National Bank)(1)           1,003
                    2,230  Sacramento County Improvement
                              Bond Act 1915 Special
                              Assessment, (Sunrise/Cordova
                              Reassessment), 5.20%, 9/2/08            2,263
                    1,000  Stockton Community Facilities
                              District Special Tax Rev., Series
                              1998 A, (Mello Roos-Weston
                              Ranch), 5.80%, 9/1/14                   1,030
                    1,000  Student Education Loan
                              Marketing Corp. Rev., Series
                              1998 IV-D-1, 5.875%, 1/1/18
                              (Guaranteed: Student Loans)               972
                                                                   ---------
                                                                      5,982
                                                                   ---------
COLORADO--3.1%
                    1,280  Colorado Health Facilities Auth.
                              Rev., Series 1998 A,
                              (Volunteers), 5.00%, 7/1/03             1,278
                                                                   ---------
FLORIDA--6.7%
                      985  Arbor Greene Community
                              Development District Special
                              Assessment Rev., 5.75%,
                              5/1/06                                    996
                    1,500  Heritage Isles Community
                              Development District Special
                              Assessment Rev., Series
                              1998 A, 5.75%, 5/1/05(2)                1,520
                      210  Manatee County Housing Finance
                              Auth. Mortgage Rev., (Single
                              Family), 7.20%, 5/1/28
                              (GNMA/FNMA/FHLMC)                         240
                                                                   ---------
                                                                      2,756
                                                                   ---------

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
IDAHO--1.3%
                   $  495  Idaho Housing Agency Rev.,
                              Series 1995 C-2, (Single Family
                              Mortgage), 6.35%, 7/1/15               $  532
                                                                   ---------
ILLINOIS--2.2%
                      890  Illinois Educational Facilities Auth.
                              Rev., Series 1998 B,
                              (Midwestern University), 5.50%,
                              5/15/28                                   895
                                                                   ---------
INDIANA--4.4%
                      250  Indiana Health Facilities Financing
                              Auth. Hospital Rev., (Jackson
                              County Scheck Memorial),
                              5.125%, 2/15/17                           244
                      500  Indiana Health Facilities Financing
                              Auth. Hospital Rev., (Jackson
                              County Scheck Memorial),
                              5.25%, 2/15/22                            491
                    1,020  Indianapolis Airport Auth. Rev.,
                              Series 1995 A, (United Airlines),
                              6.50%, 11/15/31                         1,097
                                                                   ---------
                                                                      1,832
                                                                   ---------
KENTUCKY--0.4%
                      160  Kentucky Housing Corp. Rev.,
                              Series 1988 C, 7.90%, 1/1/21
                              (FHA/VA Mortgages)                        168
                                                                   ---------
MISSISSIPPI--3.6%
                    1,500  Mississippi Business Finance Corp.
                              Health Facilities Rev., (Medical
                              Foundation Inc.), 5.375%,
                              7/1/15                                  1,482
                                                                   ---------
MISSOURI--1.8%
                      465  Hannibal Industrial Development
                              Auth. Educational Facilities Rev.,
                              (Hannibal-Lagrange College),
                              5.90%, 10/1/18                            475
                      250  Raymore Special Obligation Rev.,
                              5.70%, 3/1/23(2)                          249
                                                                   ---------
                                                                        724
                                                                   ---------
NEW JERSEY--4.8%
                    2,000  New Jersey Economic
                              Development Auth. Rev., Series
                              1998 A, (Kapkowski Road
                              Landfill), 6.375%, 4/1/31               1,977
                                                                   ---------
NEW MEXICO--2.5%
                    1,000  Santa Fe Educational Facilities
                              Rev., (College of Santa Fe),
                              5.875%, 10/1/21                         1,042
                                                                   ---------

                                              See Notes to Financial Statements


32      1-800-345-2021


High-Yield Municipal--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
NORTH CAROLINA--3.8%
                   $  595  North Carolina Medical Care
                              Community Hospital Rev.,
                              (Halifax Regional Medical
                              Center), 5.00%, 8/15/18                $  572
                    1,050  North Carolina Medical Care
                              Community Hospital Rev.,
                              (Halifax Regional Medical
                              Center), 5.00%, 8/15/24                   995
                                                                   ---------
                                                                      1,567
                                                                   ---------
OHIO--1.3%
                      500  Erie County Franciscan Services
                              Corp. Rev., (Providence Hospital
                              Inc.), 6.00%, 1/1/13(2)                   533
                                                                   ---------
OREGON--5.8%
                    1,415  Oregon Health Housing
                              Educational & Cultural Facilities
                              Auth. Rev., 4.50%, 10/1/06              1,403
                    1,000  Oregon Health Housing
                              Educational & Cultural Facilities
                              Auth. Rev., 5.25%, 10/1/16                968
                                                                   ---------
                                                                      2,371
                                                                   ---------
PENNSYLVANIA--8.6%
                    2,500  Dauphin County General Auth.
                              Rev., (Hyatt Regency Hotel &
                              Conference Center), 6.20%,
                              1/1/29                                  2,495
                    1,055  Philadelphia GO, 4.25%,
                              3/15/00 (FSA)(1)                        1,066
                                                                   ---------
                                                                      3,561
                                                                   ---------
TENNESSEE--0.6%
                      230  Tennessee Housing Development
                              Agency Mortgage Finance Rev.,
                              Series 1995 C, 6.45%, 7/1/21              248
                                                                   ---------
UTAH--5.7%
                    2,350  Bountiful Hospital Rev., (South
                              Davis Community Hospital),
                              5.125%, 12/15/05                        2,346
                                                                   ---------
WASHINGTON--6.9%
                      305  Kitsap County Housing Auth. Rev.,
                              Series 1998 A, (Pooled
                              Housing), 5.60%, 12/1/28                  307
                      500  Port Anacortes Rev., Series
                              1998 A, 5.625%, 9/1/16                    507
                    1,000  Spokane Downtown Foundation
                              Parking Rev., (River Park
                              Square), 5.60%, 8/1/19                  1,008
                    1,000  Washington State GO, Series
                              1997 R-98A, 5.00%, 7/1/13               1,022
                                                                   ---------
                                                                      2,844
                                                                   ---------

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
WISCONSIN--2.5%
                    1,000  Wisconsin Transportation Rev.,
                              Series 1998 B, 5.00%,
                              7/1/15 (FGIC)                         $ 1,015
                                                                   ---------
WYOMING--4.0%
                    1,500  Teton County Hospital District
                              Rev., 5.80%, 12/1/17                    1,521
                      130  Wyoming Community
                              Development Auth. Rev.,
                              Series 1990 B, (Single Family
                              Mortgage), 8.125%, 6/1/21
                              (FHA)                                     136
                                                                   ---------
                                                                      1,657
                                                                   ---------
TOTAL MUNICIPAL SECURITIES                                           37,285
                                                                   ---------
   (Cost $36,858)

SHORT-TERM MUNICIPAL SECURITIES--9.5%
CALIFORNIA--7.1%
                    1,900  Los Angeles County Public Works
                              Financing Auth. Lease Rev.
                              Floating Rate Trust Receipts,
                              Series 1998 A47, VRDN,
                              3.95%, 12/1/98 (Acquired
                              10/9/98, Cost $1,900)(3)                1,900
                    1,000  San Francisco City and County
                              Airport Commission International
                              Airport Rev., Series 1998 A-48,
                              VRDN, 4.00%, 12/1/98
                              (FGIC) (SBBPA: National
                              Westminster Bank PLC)
                              (Acquired 11/19/98,
                              Cost $1,000)(3)                         1,000
                                                                   ---------
                                                                      2,900
                                                                   ---------
FLORIDA--2.4%
                    1,000  Florida Board Education Capital
                              Outlay GO Trust Receipts,
                              VRDN, 3.45%, 12/1/98
                              (SBBPA:  Societe Generale)
                              (Acquired 11/6/98,
                              Cost $1,000)(3)                         1,000
                                                                   ---------
TOTAL SHORT-TERM MUNICIPAL SECURITIES                                 3,900
                                                                   ---------
   (Cost $3,900)

TOTAL INVESTMENT SECURITIES--100.0%                                 $41,185
                                                                   =========
   (Cost $40,758)

See Notes to Financial Statements


                                                 www.americancentury.com      33


High-Yield Municipal--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

NOTES TO SCHEDULE OF INVESTMENTS

COP = Certificates of Participation

FGIC = Financial Guaranty Insurance Co.

FHA = Federal Housing Authority

FHLMC = Federal Home Loan Mortgage Corporation

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GNMA = Government National Mortgage Corporation

GO = General Obligation

SBBPA = Standby Bond Purchase Agreement

VA = Veteran's Administration

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted  average  portfolio  maturity.  Rate shown is effective
November 30, 1998.

(1)  When-issued security.

(2)  Security,  or a portion thereof,  has been segregated at the custodion bank
     for when-issued securities.

(3)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement and, unless  registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate value of restricted  securities at November 30, 1998, was $3,900,
     which represented 9.9% of net assets.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* principal amount of each investment

* the market value of each investment

* the percentage of investments in each state

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


34      1-800-345-2021


<TABLE>
<CAPTION>
Statements of Assets and Liabilities
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)
                                                     INTERMEDIATE-
                                      LIMITED-TERM       TERM         LONG-TERM      HIGH-YIELD
                                        TAX-FREE       TAX-FREE       TAX-FREE       MUNICIPAL
ASSETS                                (In Thousands Except Per-Share Amounts)
<S>                                           <C>             <C>             <C>              <C>
Investment securities, at value
  (identified cost of $39,215,
  $141,836, $121,412 and $40,758,
  respectively)(Note 3) .........   $      40,101   $     148,844   $     130,186   $      41,185
Cash ............................             166             127             513              17
Investment in affiliated money
  market fund (Note 2) ..........            --                 2               6            --
Receivable for investments sold .            --               589           1,983            --
Interest receivable .............             561           2,327           1,938             615
                                    -------------   -------------   -------------   -------------
                                           40,828         151,889         134,626          41,817
                                    -------------   -------------   -------------   -------------

LIABILITIES
Disbursements in excess
  of demand deposit cash ........             253             123              69             206
Payable for investments
  purchased .....................            --             4,041           9,249           2,069
Payable for capital shares
  redeemed ......................               2              68              37              10
Dividends payable ...............              13              54              48              16
Accrued management fees
  (Note 2) ......................              17              61              51            --
                                    -------------   -------------   -------------   -------------
                                              285           4,347           9,454           2,301
                                    -------------   -------------   -------------   -------------
Net Assets ......................   $      40,543   $     147,542   $     125,172   $      39,516
                                    =============   =============   =============   =============

CAPITAL SHARES
Outstanding (unlimited number
  of shares authorized) .........           3,957          13,854          11,401           3,862
                                    =============   =============   =============   =============
Net Asset Value Per Share .......   $       10.25   $       10.65   $       10.98   $       10.23
                                    =============   =============   =============   =============

NET ASSETS CONSIST OF:
Capital paid-in .................   $      39,482   $     139,467   $     114,398   $      38,954
Undistributed net investment
  income ........................            --              --                24            --
Accumulated undistributed
  net realized gain
  from investment transactions ..             175           1,067           1,975             136
Net unrealized appreciation
  on investments (Note 3) .......             886           7,008           8,775             426
                                    -------------   -------------   -------------   -------------
                                    $      40,543   $     147,542   $     125,172   $      39,516
                                    =============   =============   =============   =============
</TABLE>

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of fund shares  outstanding  gives you the price of an individual  share, or the
net asset value per share.

NET ASSETS are also broken out by capital (money invested by shareholders);  net
investment income not yet paid to shareholders or net investment losses, if any;
net gains earned on investments  but not yet paid to  shareholders or net losses
on investments (known as realized gains or losses); and finally, gains or losses
on  securities  still owned by the fund  (known as  unrealized  appreciation  or
depreciation).  This  breakout  tells  you the  value  of net  assets  that  are
performance-related,  such as investment  gains or losses,  and the value of net
assets that are not related to performance,  such as shareholder investments and
redemptions.

See Notes to Financial Statements


                                                 www.americancentury.com      35


<TABLE>
<CAPTION>
Statements of Operations
- --------------------------------------------------------------------------------

FOR THE SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED)

                                                   INTERMEDIATE-
                                   LIMITED-TERM         TERM          LONG-TERM       HIGH-YIELD
                                     TAX-FREE         TAX-FREE         TAX-FREE        MUNICIPAL
INVESTMENT INCOME                                  (In Thousands)
Income:
<S>                                <C>             <C>             <C>             <C>          
Interest .......................   $         897   $       3,571   $       3,174   $         840
                                   -------------   -------------   -------------   -------------

Expenses (Note 2):
Management fees ................             101             359             299             101
Trustees' fees and expenses ....               2               3               3               1
                                   -------------   -------------   -------------   -------------
  Total expenses ...............             103             362             302             102
Amount waived ..................            --              --              --              (102)
                                   -------------   -------------   -------------   -------------
  Net expenses .................             103             362             302            --
                                   -------------   -------------   -------------   -------------
Net investment income ..........             794           3,209           2,872             840
                                   -------------   -------------   -------------   -------------

REALIZED AND UNREALIZED
GAIN ON INVESTMENTS
(NOTE 3)
Net realized gain on investments             123             416             684             153
Change in net unrealized
  appreciation on investments ..             227           1,216           1,116             264
                                   -------------   -------------   -------------   -------------
Net realized and unrealized
  gain on investments ..........             350           1,632           1,800             417
                                   -------------   -------------   -------------   -------------
Net Increase in Net Assets
  Resulting from Operations ....   $       1,144   $       4,841   $       4,672   $       1,257
                                   =============   =============   =============   =============
</TABLE>

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF  OPERATIONS--This  statement breaks out how each
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized appreciation or
  depreciation)

                                              See Notes to Financial Statements


36      1-800-345-2021


<TABLE>
<CAPTION>
Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED), PERIOD ENDED MAY 31, 1998(1) AND
YEAR ENDED OCTOBER 31, 1997

                                          LIMITED-TERM TAX-FREE           INTERMEDIATE-TERM TAX-FREE
Increase (Decrease)                NOV. 30,     MAY 31,    OCT. 31,    NOV. 30,     MAY 31,    OCT. 31,
in Net Assets                        1998        1998        1997        1998        1998        1997
<S>                                  <C>         <C>         <C>         <C>         <C>         <C> 
OPERATIONS                                                     (In Thousands)
Net investment income ........   $     794    $     878    $   1,796    $   3,209    $   3,630    $   3,978
Net realized gain (loss)
  on investments .............         123           34          283          416          652          758
Change in net unrealized
  appreciation on investments          227          102          164        1,216          400        1,119
                                 ---------    ---------    ---------    ---------    ---------    ---------
Net increase in net assets
  resulting from operations ..       1,144        1,014        2,243        4,841        4,682        5,855
                                 ---------    ---------    ---------    ---------    ---------    ---------

DISTRIBUTIONS TO
SHAREHOLDERS
From net investment income ...        (794)        (878)      (1,796)      (3,209)      (3,630)      (3,978)
From net realized gains
  from investment transactions        --           --           (281)        --           (257)        (686)
                                 ---------    ---------    ---------    ---------    ---------    ---------
Decrease in net assets
  from distributions .........        (794)        (878)      (2,077)      (3,209)      (3,887)      (4,664)
                                 ---------    ---------    ---------    ---------    ---------    ---------

CAPITAL SHARE
TRANSACTIONS
Proceeds from shares sold ....       8,987       12,276       25,373       23,731       22,424       24,839
Proceeds from shares issued
  in connection with
  acquisition (Note 5) .......        --           --           --           --           --         60,519
Proceeds from reinvestment
  of distributions ...........         706          780        1,901        2,616        3,161        3,963
Payments for shares
  redeemed ...................      (7,910)     (11,219)     (40,869)     (18,344)     (20,889)     (38,664)
                                 ---------    ---------    ---------    ---------    ---------    ---------
Net increase (decrease)
  in net assets from capital
  share transactions .........       1,783        1,837      (13,595)       8,003        4,696       50,657
                                 ---------    ---------    ---------    ---------    ---------    ---------
Net increase (decrease)
  in net assets ..............       2,133        1,973      (13,429)       9,635        5,491       51,848

NET ASSETS
Beginning of period ..........      38,410       36,437       49,866      137,907      132,416       80,568
                                 ---------    ---------    ---------    ---------    ---------    ---------
End of period ................   $  40,543    $  38,410    $  36,437    $ 147,542    $ 137,907    $ 132,416
                                 =========    =========    =========    =========    =========    =========

TRANSACTIONS IN SHARES
OF THE FUNDS
Sold .........................         881        1,208        2,515        2,239        2,127        2,387
Shares issued in connection
  with acquisition (Note 5) ..        --           --           --           --           --          5,830
Issued in reinvestment
  of distributions ...........          69           77          189          247          301          381
Redeemed .....................        (775)      (1,106)      (4,050)      (1,735)      (1,986)      (3,725)
                                 ---------    ---------    ---------    ---------    ---------    ---------
Net increase (decrease) ......         175          179       (1,346)         751          442        4,873
                                 =========    =========    =========    =========    =========    =========
</TABLE>

(1)  The fiscal year end was changed from October 31 to May 31 for  Limited-Term
     Tax-Free  and  Intermediate-Term  Tax-Free,  resulting  in  a  seven  month
     reporting period.

See Notes to Financial Statements


                                                 www.americancentury.com      37


<TABLE>
<CAPTION>
Statements of Changes in Net Assets
- --------------------------------------------------------------------------------
                                                                    (Continued)

SIX MONTHS ENDED NOVEMBER 30, 1998 (UNAUDITED), PERIOD ENDED MAY 31, 1998(1) AND
YEAR ENDED OCTOBER 31, 1997

                                           LONG-TERM TAX-FREE            HIGH-YIELD MUNICIPAL
Increase (Decrease)                NOV. 30,      MAY 31,     OCT. 31,     NOV. 30,     MAY 31,
in Net Assets                       1998         1998         1997         1998        1998
<S>                                 <C>          <C>          <C>          <C>         <C> 
OPERATIONS                                      (In Thousands)
Net investment income .......   $   2,872    $   3,216    $   3,377    $     840    $     106
Net realized gain (loss)
  on investments ............         684        1,317        1,546          153          (17)
Change in net unrealized
  appreciation on investments       1,116           93          853          264          162
                                ---------    ---------    ---------    ---------    ---------
Net increase in net assets
  resulting from operations .       4,672        4,626        5,776        1,257          251
                                ---------    ---------    ---------    ---------    ---------

DISTRIBUTIONS TO
SHAREHOLDERS
From net investment income ..      (2,872)      (3,216)      (3,377)        (840)        (106)
From net realized gains from
  iinvestment transactions ..        --           (725)        (823)        --           --
                                ---------    ---------    ---------    ---------    ---------
Decrease in net assets from
  distributions .............      (2,872)      (3,941)      (4,200)        (840)        (106)
                                ---------    ---------    ---------    ---------    ---------

CAPITAL SHARE
TRANSACTIONS
Proceeds from shares sold ...      39,175       36,917       29,116       26,057       19,646
Proceeds from shares issued
  in connection with
  acquisition (Note 5) ......        --           --         52,028         --           --
Proceeds from reinvestment
  of distributions ..........       2,247        3,148        3,588          673           90
Payments for shares redeemed      (34,665)     (33,003)     (38,212)      (6,419)      (1,093)
                                ---------    ---------    ---------    ---------    ---------
Net increase (decrease) in
  net assets from capital
  share transactions ........       6,757        7,062       46,520       20,311       18,643
                                ---------    ---------    ---------    ---------    ---------
Net increase (decrease)
  in net assets .............       8,557        7,747       48,096       20,728       18,788

NET ASSETS
Beginning of period .........     116,615      108,868       60,772       18,788         --
                                ---------    ---------    ---------    ---------    ---------
End of period ...............   $ 125,172    $ 116,615    $ 108,868    $  39,516    $  18,788
                                =========    =========    =========    =========    =========

TRANSACTIONS IN SHARES
OF THE FUNDS
Sold ........................       3,591        3,424        2,730        2,561        1,964
Shares issued in connection
  with acquisition (Note 5) .        --           --          4,905         --           --
Issued in reinvestment
  of distributions ..........         206          292          337           66            9
Redeemed ....................      (3,180)      (3,057)      (3,591)        (629)        (109)
                                ---------    ---------    ---------    ---------    ---------
Net increase (decrease) .....         617          659        4,381        1,998        1,864
                                =========    =========    =========    =========    =========
</TABLE>

(1)  The fiscal year end was  changed  from  October 31 to May 31 for  Long-Term
     Tax-Free,  resulting  in a seven month  reporting  period.  For  High-Yield
     Municipal,  the period shown is March 31, 1998 (commencement of operations)
     through May 31, 1998.

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
each fund's net assets changed over the past three reporting periods. It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
  redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions and capital share transactions  result in net assets at the end of
the period.

                                              See Notes to Financial Statements


38      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------

NOVEMBER 30, 1998 (UNAUDITED)

1.  ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     ORGANIZATION--American  Century  Municipal Trust (the Trust), is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company.  American Century - Benham Limited-Term  Tax-Free Fund  (Limited-Term),
American Century - Benham Intermediate-Term  Tax-Free Fund  (Intermediate-Term),
American  Century - Benham  Long-Term  Tax-Free  Fund  (Long-Term)  and American
Century - Benham High-Yield  Municipal  (High-Yield) (the Funds) are four of the
eight funds issued by the Trust. The Funds,  except High-Yield,  are diversified
under  the 1940  Act.  The  objective  of  Limited-Term,  Intermediate-Term  and
Long-Term  is to seek as high a level of  current  income  exempt  from  federal
income  taxes  as  is  consistent   with  prudent   investment   management  and
conservation of shareholders'  capital.  High-Yield's  objective is to seek high
current  income  exempt from  federal  income  taxes as is  consistent  with its
investment  policies,   which  permit  investment  in  lower-rated  and  unrated
securities.  High-Yield invests primarily in lower-rated debt securities,  which
are  subject  to  greater  credit  risk and  consequently  offer  higher  yield.
Securities  of this  type are  subject  to  substantial  risks  including  price
volatility,  liquidity  risk and default  risk.  The Funds  invest  primarily in
municipal obligations with maturities based on each Fund's investment objective.
The Funds may concentrate  their investments in certain states and therefore may
have more  exposure to credit risk  related to those states than funds that have
broader  geographical  diversification.  The  following  significant  accounting
policies are in accordance with generally accepted accounting principles.

     SECURITY  VALUATIONS--Portfolio  securities  are valued at  current  market
value as provided  by a  commercial  pricing  service or at the mean of the most
recent  bid  and  asked  prices.  When  valuations  are not  readily  available,
securities are valued at fair value as determined in accordance  with procedures
adopted by the Board of Trustees.

     SECURITY  TRANSACTIONS--Security  transactions  are accounted for as of the
trade date. Net realized gains and losses are determined on the identified  cost
basis, which is also used for federal income tax purposes.

     INVESTMENT  INCOME--Interest  income is recorded  on the accrual  basis and
includes accretion of discounts and amortization of premiums.

     INCOME  TAX  STATUS--It  is the policy of the Funds to  distribute  all net
investment  income  and net  realized  gains to  shareholders  and to  otherwise
qualify as a regulated  investment  company under the provisions of the Internal
Revenue  Code.  Accordingly,  no  provision  has been made for  federal or state
income taxes.

     DISTRIBUTIONS TO SHAREHOLDERS--Distributions from net investment income are
declared daily and distributed  monthly.  Distributions  from net realized gains
are declared and paid annually.

     High-Yield has elected to treat $17,496 of net capital  losses  incurred in
the  two-month  period ended May 31, 1998,  as having  incurred in the following
fiscal year.

     The  character of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes.  These differences  reflect the differing character
of certain income items and net capital gains and losses for financial statement
and tax  purposes  and may  result in  reclassification  among  certain  capital
accounts.

     On  December  11,  1998  the  Funds  declared  and paid a  distribution  to
shareholders of record on that date. The  distributions  from net realized gains
on  investments  were $0.0349,  $0.0765,  $0.1772 and $0.0347 for  Limited-Term,
Intermediate-Term, Long-Term and High-Yield respectively.

     FUTURES  CONTRACTS--The  Funds  may  buy and  sell  interest  rate  futures
contracts  relating to debt  securities  and write and buy put and call  options
relating  to  interest  rate  futures  contracts.  The Funds may use futures and
options  transactions  to maintain cash reserves while remaining fully invested,
to  facilitate  trading,  to  reduce  transaction  costs,  or to  pursue  higher
investment  returns when a futures contract is priced more attractively than its
underlying  security  or  index.  One of the  risks  of  entering  into  futures
contracts may include the possibility  that the changes in value of the contract
may not correlate with the changes in value of the underlying  securities.  Upon
entering into a futures contract, the Fund is required to deposit either cash or
securities  in an amount equal to a certain  percentage  of the  contract  value
(initial margin).  Subsequent  payments  (variation margin) are made or received
daily,  in cash, by the Fund. The variation  margin is equal to the daily change
in the contract  value and is recorded as an unrealized  gain or loss.  The Fund
recognizes a realized gain or loss when the contract is closed or expires. There
were no open futures contracts at November 30, 1998.

     ADDITIONAL  INFORMATION--Funds  Distributor,  Inc.  (FDI)  is  the  Trust's
distributor. Certain officers of FDI are also officers of the Trust.


                                                 www.americancentury.com      39


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)
- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

     The Trust has entered into a Management  Agreement  with  American  Century
Investment  Management,  Inc.  (ACIM) that  provides  each Fund with  investment
advisory and management  services in exchange for a single,  unified  management
fee.  Expenses  excluded from this  agreement are  brokerage,  taxes,  portfolio
insurance,  interest,  fees and expenses of the Trustees who are not  considered
"interested persons" as defined in the Investment Company Act of 1940 (including
counsel fees) and extraordinary  expenses.  The annual rate at which this fee is
assessed is determined monthly in a two-step process: First, a fee rate schedule
is  applied  to the net  assets  of all of the  funds in the  Fund's  investment
category which are managed by ACIM (the "Investment  Category Fee"). The overall
investment objective of each Fund determines its Investment Category.  The three
investment  categories  are:  the  Money  Market  Fund  Category,  the Bond Fund
Category and the Equity Fund  Category.  The Funds are included in the Bond Fund
Category.  Second,  a separate fee rate schedule is applied to the net assets of
all of the funds managed by ACIM (the "Complex  Fee").  The Investment  Category
Fee and the Complex Fee are then added to determine the unified  management  fee
rate.  The  management  fee is paid  monthly by each Fund  based on each  Fund's
aggregate  average daily net assets during the previous month  multiplied by the
monthly management fee rate.

     The  annualized   Investment   Category  Fee  schedule  for   Limited-Term,
Intermediate-Term and Long-Term is as follows:

     0.2800% of the first $1 billion 
     0.2280% of the next $1 billion 
     0.1980% of the next $3 billion 
     0.1780% of the next $5 billion 
     0.1650% of the next $15 billion 
     0.1630% of the next $25 billion
     0.1625% of the average daily net assets over $50 billion

      The  annualized  Investment  Category Fee schedule  for  High-Yield  is as
follows:

     0.4100% of the first $1 billion 
     0.3580% of the next $1 billion 
     0.3280% of the next $3 billion 
     0.3080% of the next $5 billion 
     0.2950% of the next $15 billion 
     0.2930% of the next $25 billion
     0.2925% of the average daily net assets over $50 billion

     The annualized Complex Fee schedule (for all Funds) is as follows:

     0.3100% of the first $2.5 billion 
     0.3000% of the next $7.5 billion 
     0.2985% of the next $15 billion 
     0.2970% of the next $25 billion 
     0.2960% of the next $50 billion 
     0.2950% of the next $100 billion 
     0.2940% of the next $100 billion 
     0.2930% of the next $200 billion 
     0.2920% of the next $250 billion
     0.2910% of the next $500 billion
     0.2900% of the average daily net assets over $1,250 billion

     ACIM has agreed to waive all  expenses for  High-Yield  from March 31, 1998
(inception) through April 30, 1999.

     Certain  officers  and  trustees  of the  Trust  are also  officers  and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the Trust's  investment  Manager,  ACIM, and the
Trust's transfer agent, American Century Services, Inc.

     As of  November  30,  1998,  Intermediate-Term  had  invested  $1,817,  and
Long-Term had invested  $5,807 in shares of American  Century - Benham  Tax-Free
Money Market Fund (Tax-Free Money Market).  The terms of such  transactions were
identical to those with  non-related  entities  except that, to avoid  duplicate
management  fees,  Intermediate-Term  and Long-Term did not pay ACIM  management
fees with respect to assets invested in Tax-Free Money Market.


40      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
NOVEMBER 30, 1998 (UNAUDITED)

- --------------------------------------------------------------------------------
3. INVESTMENT TRANSACTIONS

  Investment transactions, excluding short-term investments, were as follows:

<TABLE>
                                     LIMITED-TERM      INTERMEDIATE-TERM      LONG-TERM      HIGH-YIELD
                                       TAX-FREE            TAX-FREE            TAX-FREE       MUNICIPAL
PURCHASES (In Thousands)
<S>                                     <C>                 <C>                 <C>            <C>    
Municipal Debt Obligations ...........  $11,067             $30,552             $41,498        $37,905

PROCEEDS FROM SALES (In Thousands)
Municipal Debt Obligations ...........  $10,660             $22,493             $33,803        $17,142

  On  November  30,  1998,  the  composition  of  unrealized   appreciation  and
depreciation of investment securities based on the aggregate cost of investments
for federal income tax purposes was as follows:

                                     LIMITED-TERM      INTERMEDIATE-TERM      LONG-TERM      HIGH-YIELD
                                       TAX-FREE            TAX-FREE            TAX-FREE       MUNICIPAL
(In Thousands)
Appreciation .........................   $889               $7,060              $8,830           $457
Depreciation .........................    (3)                (52)                (55)            (31)
                                       ---------           ----------          ---------        --------
Net ..................................   $886               $7,008              $8,775           $426
                                       =========           ==========          =========        ========
</TABLE>

  The aggregate cost of investments for federal income tax purposes was the same
as the cost for financial reporting purposes for the Funds.

- --------------------------------------------------------------------------------
4. BANK LOANS

    Effective  December 18,  1998,  the Funds,  along with  certain  other funds
managed by ACIM,  entered  into an  unsecured  $570,000,000  bank line of credit
agreement with Chase Manhattan.  Borrowings under the agreement bear interest at
the Federal Funds rate plus 0.40%.

- --------------------------------------------------------------------------------
5. REORGANIZATION PLAN

    On August 29, 1997, Limited-Term,  Intermediate-Term, and Long-Term acquired
all of the net assets of the American Century - Benham  Limited-Term  Tax-Exempt
Fund  (Limited-Term  Tax-Exempt),  American  Century - Benham  Intermediate-Term
Tax-Exempt Fund  (Intermediate-Term  Tax-Exempt),  and American Century - Benham
Long-Term Tax-Exempt Fund (Long-Term  Tax-Exempt),  respectively,  pursuant to a
plan of reorganization  approved by the acquired funds' shareholders on July 30,
1997.  The  surviving  funds  for the  purposes  of  maintaining  the  financial
statements and performance history in the  post-reorganization  are Limited-Term
Tax-Exempt,  Intermediate-Term Tax-Exempt, and Long-Term Tax-Exempt. These funds
were also reorganized as funds issued by American Century Municipal Trust.

    The  acquisition  was  accomplished  by a  tax-free  exchange  of  shares of
Limited-Term,  Intermediate-Term,  and  Long-Term of 3,729,594,  5,588,194,  and
4,402,660,  respectively,  for  3,729,594,  5,830,457,  and 4,904,754  shares of
Limited-Term Tax-Exempt, Intermediate-Term Tax-Exempt, and Long-Term Tax-Exempt,
respectively,   outstanding   on   August   29,   1997.   The  net   assets   of
Intermediate-Term,  and  Long-Term  immediately  before  the  acquisitions  were
$60,519,330 and $52,028,294,  respectively.  Since  Limited-Term was not a legal
entity prior to the merger,  there were no assets  prior to the  reorganization.
Unrealized  appreciation of $2,290,179 and $3,743,216 for  Intermediate-Term and
Long-Term,  respectively, was combined with that of Intermediate-Term Tax-Exempt
and Long-Term  Tax-Exempt.  Immediately after the acquisition,  the combined net
assets of  Limited-Term,  Intermediate-Term,  and  Long-Term  were  $37,556,857,
$133,562,791, and $106,095,509, respectively.


                                                 www.americancentury.com      41


<TABLE>
<CAPTION>
Limited-Term Tax-Free--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                     1998(1)          1998(2)            1997           1996             1995           1994
PER-SHARE DATA
Net Asset Value,
<S>                              <C>               <C>               <C>            <C>               <C>            <C>       
Beginning of Period ..........   $    10.16        $    10.11        $    10.08     $    10.09        $     9.95     $    10.04
                                 ----------        ----------        ----------     ----------        ----------     ----------
Income From Investment
Operations
  Net Investment Income ......         0.20              0.24              0.41           0.43              0.44           0.36
  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ...............         0.09              0.05              0.10          (0.01)             0.14          (0.09)
                                 ----------        ----------        ----------     ----------        ----------     ----------
  Total From Investment
  Operations .................         0.29              0.29              0.51           0.42              0.58           0.27
                                 ----------        ----------        ----------     ----------        ----------     ----------
Distributions
  From Net Investment Income .        (0.20)            (0.24)            (0.41)         (0.43)            (0.44)         (0.36)
  From Net Realized Gains on
  Investment Transactions ....         --                --               (0.07)          --                --             --
                                 ----------        ----------        ----------     ----------        ----------     ----------
  Total Distributions ........        (0.20)            (0.24)            (0.48)         (0.43)            (0.44)         (0.36)
                                 ----------        ----------        ----------     ----------        ----------     ----------
Net Asset Value, End of Period   $    10.25        $    10.16        $    10.11     $    10.08        $    10.09     $     9.95
                                 ==========        ==========        ==========     ==========        ==========     ==========
  Total Return(3) ............         2.90%             2.87%             5.22%          4.26%             5.95%          2.75%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ........         0.51%(4)          0.52%(4)          0.59%          0.38%(5)         --(5)          --(5)
Ratio of Net Investment Income
to Average Net Assets ........         3.96%(4)          4.04%(4)          4.05%          4.28%             4.38%          3.62%
Portfolio Turnover Rate ......           27%               28%               74%            68%               78%            42%
Net Assets, End of Period
(in thousands) ...............   $   40,543        $   38,410        $   36,437     $   49,866        $   58,837     $   60,857
</TABLE>

(1) Six months ended November 30, 1998 (unaudited).

(2) Seven months ended May 31, 1998. The Fund's fiscal year end was changed from
    October 31 to May 31 resulting in a seven month reporting period.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

(5) ACIM had voluntarily waived its management fee through February 29, 1996. In
    absence of the waiver, the ratio of operating expenses to average net assets
    would have been 0.60%.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

                                              See Notes to Financial Statements


42      1-800-345-2021


<TABLE>
<CAPTION>
Intermediate-Term Tax-Free--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                      1998(1)           1998(2)            1997              1996           1995             1994
PER-SHARE DATA
Net Asset Value,
<S>                              <C>                <C>                <C>               <C>            <C>            <C>        
Beginning of Period ..........   $     10.52        $     10.46        $     10.35       $     10.45    $     10.01    $     10.75
                                 -----------        -----------        -----------       -----------    -----------    -----------
Income From Investment
Operations
  Net Investment Income ......          0.24               0.28               0.49              0.48           0.49           0.48
  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ...............          0.13               0.08               0.21             (0.03)          0.52          (0.61)
                                 -----------        -----------        -----------       -----------    -----------    -----------
  Total From Investment
  Operations .................          0.37               0.36               0.70              0.45           1.01          (0.13)
                                 -----------        -----------        -----------       -----------    -----------    -----------
Distributions
  From Net Investment Income .         (0.24)             (0.28)             (0.49)            (0.48)         (0.49)         (0.48)
  From Net Realized Gains on
  Investment Transactions ....          --                (0.02)             (0.10)            (0.07)         (0.08)         (0.13)
                                 -----------        -----------        -----------       -----------    -----------    -----------
  Total Distributions ........         (0.24)             (0.30)             (0.59)            (0.55)         (0.57)         (0.61)
                                 -----------        -----------        -----------       -----------    -----------    -----------
Net Asset Value, End of Period   $     10.65        $     10.52        $     10.46       $     10.35    $     10.45    $     10.01
                                 ===========        ===========        ===========       ===========    ===========    ===========
  Total Return(3) ............          3.56%              3.50%              6.88%             4.47%         10.41%         (1.25)%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ........          0.51%(4)           0.51%(4)           0.58%             0.60%          0.60%          0.60%
Ratio of Net Investment Income
to Average Net Assets ........          4.53%(4)           4.62%(4)           4.71%             4.66%          4.77%          4.59%
Portfolio Turnover Rate ......            16%                17%                35%(5)            39%            32%            74%
Net Assets, End of Period
(in thousands) ...............   $   147,542        $   137,907        $   132,416       $    80,568    $    80,248    $    81,400
</TABLE>

(1) Six months ended November 30, 1998 (unaudited).

(2) Seven months ended May 31, 1998. The Fund's fiscal year end was changed from
    October 31 to May 31 resulting in a seven month reporting period.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

(5) Purchases,  sales,  and market  value  amounts for Benham  Intermediate-Term
    Tax-Free Fund prior to the merger were excluded from the portfolio  turnover
    calculation.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

See Notes to Financial Statements


                                                 www.americancentury.com      43


<TABLE>
<CAPTION>
Long-Term Tax-Free--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED OCTOBER 31 (EXCEPT AS NOTED)

                                     1998(1)           1998(2)             1997               1996           1995          1994
PER-SHARE DATA
Net Asset Value,
<S>                              <C>                <C>                <C>               <C>            <C>            <C>        
Beginning of Period ..........   $     10.81        $     10.75        $     10.58       $     10.54    $      9.75    $     11.10
                                 -----------        -----------        -----------       -----------    -----------    -----------
Income From Investment
Operations
  Net Investment Income ......          0.26               0.31               0.55              0.53           0.53           0.52
  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ...............          0.17               0.13               0.33              0.04           0.83          (1.01)
                                 -----------        -----------        -----------       -----------    -----------    -----------
  Total From Investment
  Operations .................          0.43               0.44               0.88              0.57           1.36          (0.49)
                                 -----------        -----------        -----------       -----------    -----------    -----------
Distributions
  From Net Investment Income .         (0.26)             (0.31)             (0.55)            (0.53)         (0.53)         (0.52)
  From Net Realized Gains on
  Investment Transactions ....          --                (0.07)             (0.16)             --            (0.04)         (0.34)
                                 -----------        -----------        -----------       -----------    -----------    -----------
  Total Distributions ........         (0.26)             (0.38)             (0.71)            (0.53)         (0.57)         (0.86)
                                 -----------        -----------        -----------       -----------    -----------    -----------
Net Asset Value, End of Period   $     10.98        $     10.81        $     10.75       $     10.58    $     10.54    $      9.75
                                 ===========        ===========        ===========       ===========    ===========    ===========
  Total Return(3) ............          4.07%              4.18%              8.59%             5.60%         14.45%         (4.70)%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ........          0.51%(4)           0.51%(4)           0.58%             0.59%          0.59%          0.60%
Ratio of Net Investment Income
to Average Net Assets ........          4.85%(4)           4.96%(4)           5.16%             5.06%          5.24%          5.00%
Portfolio Turnover Rate ......            29%                47%                65%(5)            60%            61%            66%
Net Assets, End of Period
(in thousands) ...............   $   125,172        $   116,615        $   108,868       $    60,772    $    57,997    $    50,964
</TABLE>

(1) Six months ended November 30, 1998 (unaudited).

(2) Seven months ended May 31, 1998. The Fund's fiscal year end was changed from
    October 31 to May 31 resulting in a seven month reporting period.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized.

(5) Purchases,  sales,  and market value amounts for Benham  Long-Term  Tax-Free
    Fund  prior  to  the  merger  were  excluded  from  the  portfolio  turnover
    calculation.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

                                              See Notes to Financial Statements


44      1-800-345-2021


High-Yield Municipal--Financial Highlights
- --------------------------------------------------------------------------------

                        FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD INDICATED

                                                      1998(1)        1998(2)
PER-SHARE DATA
Net Asset Value, Beginning of Period .........     $    10.08       $     9.99
                                                   ----------       ----------
Income From Investment Operations
  Net Investment Income ......................           0.27             0.09
  Net Realized and Unrealized Gain
  on Investment Transactions .................           0.15             0.09
                                                   ----------       ----------
  Total From Investment Operations ...........           0.42             0.18
                                                   ----------       ----------
Distributions
  From Net Investment Income .................          (0.27)           (0.09)
                                                   ----------       ----------
Net Asset Value, End of Period ...............     $    10.23       $    10.08
                                                   ==========       ==========
  Total Return(3) ............................           4.20%            1.81%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses to
Average Net Assets(4) ........................           --               --
Ratio of Net Investment Income to
Average Net Assets(4) ........................           5.29%            5.38%
Portfolio Turnover Rate ......................             60%              44%
Net Assets, End of Period
(in thousands) ...............................     $   39,516       $   18,788

(1) Six months ended November 30, 1998 (unaudited).

(2) March 31, 1998 (inception) through May 31, 1998.

(3) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(4) Annualized. ACIM has voluntarily agreed to pay all expenses of the Fund from
    March 31, 1998 (inception) through April 30, 1999. In absence of the waiver,
    the annualized ratio of operating  expenses to average net assets would have
    been  0.64% for both  periods  and the  annualized  ratio of net  investment
    income to  average  net assets  would  have been  4.65% and  4.74%,  for the
    periods ending November 30, 1998 and May 31, 1998, respectively.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years (or less, if the class is not five years old).

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

See Notes to Financial Statements


                                                 www.americancentury.com      45


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     The Benham Group offers 38  fixed-income  funds,  ranging from money market
funds to long-term bond funds and including  both taxable and tax-exempt  funds.
Each fund is  managed  to  provide  a "pure  play" on a  specific  sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's  portfolio  is tied to a specific  market  index.  Fund  managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

     In addition to these principles, each fund has its own investment policies

     LIMITED-TERM  TAX-FREE  seeks  interest  income exempt from federal  income
taxes by  investing  in  municipal  securities.  The fund  maintains  a weighted
average maturity of five years or less.

     INTERMEDIATE-TERM TAX-FREE seeks interest income exempt from federal income
taxes by  investing  in  municipal  securities.  The fund  maintains  a weighted
average maturity of 5-10 years.

     LONG-TERM  TAX-FREE seeks interest  income exempt from federal income taxes
by investing  in municipal  securities.  The fund  maintains a weighted  average
maturity of 10 or more years.

     HIGH-YIELD  MUNICIPAL  seeks to  provide a high  level of  interest  income
exempt  from  federal  income  taxes by  investing  in  high-yielding  municipal
securities.  As a secondary objective, the fund seeks capital appreciation.  The
fund invests  primarily in lower-rated  or unrated  municipal  bonds,  which are
subject to greater credit and liquidity  risk. The fund has no average  maturity
restrictions  but is expected  to  maintain  an average  maturity of 10 years or
more.

     Investment income may be subject to state and local taxes and, depending on
your tax status,  the federal  alternative  minimum tax.  Capital  gains are not
exempt from federal income taxes.

COMPARATIVE INDICES

     The  following  indices  are  used  in  the  report  for  fund  performance
comparisons. They are not investment products available for purchase.

     The MERRILL LYNCH 0- TO 3-YEAR  MUNICIPAL INDEX has an average  maturity of
approximately two years. The bonds in the index have an average rating of AA1.

     The LEHMAN BROTHERS  FIVE-YEAR  MUNICIPAL  GENERAL  OBLIGATION INDEX has an
average  maturity of five years. The bonds are rated BBB or higher by Standard &
Poor's, with an average rating of AA.

     The  LEHMAN  BROTHERS  LONG-TERM   MUNICIPAL  BOND  INDEX  is  composed  of
investment-grade municipal bonds with maturities greater than 22 years.

LIPPER RANKINGS

     LIPPER INC. is an independent mutual fund ranking service that groups funds
according to their investment objectives. Rankings are based on average annual
returns for each fund in a given category for the periods indicated. Rankings
are not included for periods less than one year.

     The Lipper categories for the funds are:

     SHORT/INTERMEDIATE MUNICIPAL DEBT FUNDS (Limited-Term Tax-Free)--funds that
invest in municipal debt issues with  dollar-weighted  average maturities of 1-5
years.

     INTERMEDIATE MUNICIPAL DEBT FUNDS (Intermediate-Term  Tax-Free)--funds that
invest in municipal debt issues with dollar-weighted  average maturities of 5-10
years.

     GENERAL  MUNICIPAL DEBT FUNDS  (Long-Term  Tax-Free)--funds  that invest at
least  65% of their  assets in  municipal  debt  issues  in the top four  credit
ratings (AAA, AA, A, and BBB).

     HIGH-YIELD  MUNICIPAL DEBT  FUNDS--funds that invest at least 50% of assets
in lower-rated municipal debt issues.

[left margin]

INVESTMENT TEAM LEADERS
  PORTFOLIO MANAGERS
     DAVE MACEWEN
     STEVEN PERMUT
     JOEL SILVA

MUNICIPAL CREDIT RESEARCH TEAM
  MANAGER
     STEVEN PERMUT
  MUNICIPAL CREDIT ANALYSTS
     DAVID MOORE
     ROBERT MILLER
     BILL MCCLINTOCK
     TIM BENHAM
     BRAD BODE

CREDIT RATING GUIDELINES

   CREDIT RATINGS ARE ISSUED BY INDEPENDENT  RESEARCH COMPANIES SUCH AS STANDARD
& POOR'S AND MOODY'S.  RATINGS ARE BASED ON AN ISSUER'S  FINANCIAL  STRENGTH AND
ABILITY TO PAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.

   IT'S  IMPORTANT TO NOTE THAT CREDIT  RATINGS ARE  SUBJECTIVE,  REFLECTING THE
OPINIONS OF THE RATING AGENCIES; THEY ARE NOT ABSOLUTE STANDARDS OF QUALITY.

*  AAA, AA, A, AND BBB ARE STANDARD & POOR'S HIGHEST LONG-TERM CREDIT
   RATINGS. BONDS IN THESE RATING CATEGORIES ARE CONSIDERED "INVESTMENT
   GRADE," MEANING THEY'RE RELATIVELY SAFE FROM DEFAULT.

*  AAA--EXTREMELY STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

*  AA--VERY STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

*  A--STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

*  BBB--GOOD ABILITY TO MEET FINANCIAL OBLIGATIONS.

*  BB--LESS VULNERABLE TO DEFAULT THAN OTHER LOWER-QUALITY ISSUES BUT DO NOT
   QUITE MEET INVESTMENT-GRADE STANDARDS.


46      1-800-345-2021


Glossary
- --------------------------------------------------------------------------------

RETURNS

* TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on pages 42-45.

YIELDS

* 30-DAY SEC YIELD  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annual percentage rate based on the fund's share
price at the end of the 30-day  period.  The SEC yield  should be regarded as an
estimate of the fund's investment income, and it may not equal the fund's actual
income  distribution  rate, the income paid to a shareholder's  account,  or the
income reported in the fund's financial statements.

*  TAX-EQUIVALENT  YIELDS show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

INVESTMENT TERMS

* BASIS POINT--a basis point equals one  one-hundredth of a percentage point (or
0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

* YIELD CURVE--a graphic representation of the relationship between maturity and
yield  for  fixed-income   securities.   Yield  curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

PORTFOLIO STATISTICS

* NUMBER OF SECURITIES--the  number of different  securities held by a fund on a
given date.

*  WEIGHTED  AVERAGE  MATURITY  (WAM)--a  measurement  of the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio mature, weighted by dollar amount.

*  AVERAGE  DURATION--another  measure  of  the  sensitivity  of a  fixed-income
portfolio to interest rate changes.  Duration is a time-weighted  average of the
interest and principal payments of the securities in a portfolio.

* EXPENSE RATIO--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

TYPES OF MUNICIPAL SECURITIES

* AMT PAPER--instruments  with income subject to the federal alternative minimum
tax.

*  COPS/LEASES--securities  issued to finance public property improvements (such
as city halls and police stations) and equipment purchases.

* GO  BONDS--general  obligation  securities  backed by the taxing  power of the
issuer.

*  LAND-SECURED  BONDS--securities  such as Mello-Roos  bonds and 1915-Act bonds
that are issued to finance real estate development projects.

* PREREFUNDED BONDS/ETM BONDS--securities  refinanced or escrowed to maturity by
the issuer because of their premium coupons (higher-than-market interest rates).
These  bonds  tend to have  higher  credit  ratings  because  they are backed by
Treasury securities.

*  REVENUE  BONDS--securities  backed by  revenues  from  sales  taxes or from a
specific project, system, or facility (such as a hospital,  electric utility, or
water system).


                                                 www.americancentury.com      47


Notes
- --------------------------------------------------------------------------------


48      1-800-345-2021


[inside back cover]

AMERICAN CENTURY FUNDS
- -------------------------------------------------------------------------------

BENHAM GROUP(reg.sm)
TAXABLE BOND FUNDS
U.S. TREASURY & GOVERNMENT
   Short-Term Treasury
   Short-Term Government
   GNMA
   Intermediate-Term Treasury
   Long-Term Treasury
   Inflation-Adjusted Treasury
   Target Maturities Trust: 2000
   Target Maturities Trust: 2005
   Target Maturities Trust: 2010
   Target Maturities Trust: 2015
   Target Maturities Trust: 2020
   Target Maturities Trust: 2025
CORPORATE & DIVERSIFIED
   Limited-Term Bond
   Intermediate-Term Bond
   Bond
   Premium Bond
   High-Yield Bond
INTERNATIONAL
   International Bond

TAX-FREE & MUNICIPAL BOND FUNDS
MULTIPLE-STATE
   Limited-Term Tax-Free
   Intermediate-Term Tax-Free
   Long-Term Tax-Free
   High-Yield Municipal
SINGLE-STATE
   Arizona Intermediate-Term Municipal
   California High-Yield Municipal
   California Insured Tax-Free
   California Intermediate-Term Tax-Free
   California Limited-Term Tax-Free
   California Long-Term Tax-Free
   Florida Intermediate-Term Municipal

MONEY MARKET FUNDS
TAXABLE
   Capital Preservation
   Government Agency Money Market
   Premium Capital Reserve
   Premium Government Reserve
   Prime Money Market
TAX-FREE & MUNICIPAL
   California Municipal Money Market
   California Tax-Free Money Market
   Florida Municipal Money Market
   Tax-Free Money Market

AMERICAN CENTURY(reg.sm) GROUP
ASSET ALLOCATION
   Strategic Allocation: Conservative
   Strategic Allocation: Moderate
   Strategic Allocation: Aggressive
BALANCED
   Balanced
CONSERVATIVE EQUITY
   Income and Growth
   Equity Income
   Value
   Equity Growth
SPECIALTY
   Utilities
   Real Estate
   Global Natural Resources
   Global Gold
SMALL CAP
   Small Cap Quantitative
   Small Cap Value

TWENTIETH CENTURY GROUP
GROWTH
   Select
   Heritage Growth
   Ultra
AGGRESSIVE GROWTH
   Vista
   Giftrust
   New Opportunities
INTERNATIONAL GROWTH
   International Growth
   International Discovery
   Emerging Markets
GLOBAL
   Global Growth

Please call for a prospectus  or profile on any  American  Century  fund.  These
documents contain important information including charges and expenses,  and you
should read them carefully before you invest or send money.


[right margin]

[american century logo(reg.sm)]
American
Century

P.O. BOX 419200
KANSAS CITY, MISSOURI
64141-6200

INVESTOR SERVICES:
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE:
1-800-345-8765

TELECOMMUNICATIONS DEVICE FOR THE DEAF:
1-800-634-4113 OR 816-444-3485

FAX: 816-340-7962

INTERNET: WWW.AMERICANCENTURY.COM


AMERICAN CENTURY MUNICIPAL TRUST


INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI


THIS REPORT AND THE STATEMENTS IT CONTAINS  ARE SUBMITTED FOR THE GENERAL
INFORMATION  OF OUR SHAREHOLDERS. THE REPORT IS NOT  AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED  BY AN EFFECTIVE
PROSPECTUS.

FUNDS DISTRIBUTOR, INC.
(c) 1998 AMERICAN CENTURY SERVICES CORPORATION


[recycled logo]
Recycled


[back cover]


American Century Investments                                     BULK RATE
P.O. Box 419200                                              U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                   AMERICAN CENTURY
www.americancentury.com                                          COMPANIES



9901                                                    Funds Distributor, Inc.
SH-BKT-15064                      (c)1998 American Century Services Corporation


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