EATON VANCE INVESTMENT TRUST
N-30D, 1998-05-26
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<PAGE>
 
                        Investing
   [LOGO OF EATON       for the                        [PICTURE OF EDUCATION
 VANCE APPEARS HERE]    21st                           SIGN ON STONE WALL 
                        Century                        APPEARS HERE]






            Annual Report March 31, 1998






[PICTURE OF BLURRED                   EV
CARS ON HIGHWAY                    MARATHON
APPEARS HERE]                      NATIONAL   
                               LIMITED MATURITY 
                                MUNICIPALS FUND


                                 Eaton Vance 
                     Global Management-Global Distribution





[PICTURE OF TOP ARCH OF
  BRIDGE APPEARS HERE]


                                                                        Marathon
<PAGE>
 
EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998
Letter to Shareholders


[PHOTO APPEARS HERE]


EV Marathon National Limited Maturity Municipals Fund, Classes I and II, had
total returns of 9.5% and 10.5%, respectively, for the year ended March 31,
1998./1/ Those returns were the result of a rise in net asset value per share
for each class from $10.07 on March 31, 1997 to $10.58 on March 31, 1998, and
the reinvestment of $0.431 in dividends for Class I and $0.504 for Class II./2/
By comparison, the average return of the 140 funds in the Intermediate Municipal
Debt category, as compiled by Lipper Analytical Services, Inc. -- a nationally
recognized monitor of mutual fund performance -- was 8.2% for the same
period./3/

Amid volatile global markets,

more investors were drawn

to municipal bonds...

The past year has been very good for municipal bonds. Against a backdrop of
moderate economic growth and low inflation, investors again focused on the
unique features of municipals, which are among the last remaining tax-advantaged
vehicles. In addition, the municipal market attracted an increasing number of
crossover investors from other markets. Many investors bought municipals in a
flight to quality as the domestic equity market reached overvalued levels and
emerging markets were caught up in the turmoil of the Asian currency crisis.

A sound economy has resulted in 

improving municipal credits...

The upbeat economic climate of recent years has provided strong support for the
municipal market. Steady job growth has generated increased tax revenues for
state and local issuers. As a result, many areas hard-hit in the recessions of
the 1970s and 1980s have made a significant economic comeback, a fact reflected
in the value of their bonds. We expect to see many more such stories emerge in
the coming year.

The municipal market continues to 

offer opportunities for

tax-conscious investors...

At present, there is little sign of inflation on the horizon and the federal
budget situation has improved dramatically. Naturally, those conditions are
subject to change over time, and we will continue to closely monitor economic
progress. As for the tax-exempt market, we believe that municipals will continue
to serve their traditional function of financing vital public works, while
offering good opportunities for tax-conscious investors.

                Sincerely,
                
                /s/ Thomas J. Fetter
                
                Thomas J. Fetter
                President
                May 8, 1998


- --------------------------------------------------------------------------------
Fund Information
as of March 31, 1998



Performance/4/
- -------------------------------------------------------------------
Average Annual Total Returns (at net asset value)
- -------------------------------------------------------------------
                                                Class I   Class II
                                                -------   --------
One Year                                          9.5%      10.5%

Five Years                                        4.7        5.0

Life of Fund (5/22/92)                            5.6        5.8
                                               
SEC Average Annual Total Returns               
(including applicable CDSC)                    
- -------------------------------------------------------------------
                                                Class I   Class II
                                                -------   --------
One Year                                          6.5%      10.5%

Five Years                                        4.7        5.0

Life of Fund (5/22/92)                            5.6        5.8
 

Five Largest Sector Weightings/5/
- -------------------------------------------------------------------

Industrial Development Bonds            18.1%

General Obligations             11.7%

Nursing Homes                   11.7%

Escrowed/Prerefunded            10.7%

Hospitals                       10.0%


/1/ This return does not include the applicable contingent deferred sales charge
(CDSC) for the Fund's Class I shares. /2/ Aportion of the Fund's income may be
subject to federal income and/or alternative minimum tax and state income tax.
/3/ It is not possible to invest directly in an Average or Index. /4/ Returns
are calculated by determining the percentage change in net asset value with all
distributions reinvested. SEC returns for the Fund's Class I shares reflect
applicable CDSC based on the following schedule: 3%-1st year; 2.5%-2nd year; 2%-
3rd year; 1%-4th year. /5/ Five largest sector weightings account for 62.2% of
the portfolio's investments, determined by dividing the total market value of
the holdings by the total investments of the portfolio. Holdings are subject to
change.

Past performance is no guarantee of future results. Investment return and
principal value will fluctuate so that shares, when redeemed, may be worth more
or less than their original cost.

                                       2
<PAGE>
 
EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998
Management Discussion

[PHOTO OF WILLIAM A. AHERN
APPEARS HERE]

William H. Ahern,
Portfolio Manager

An interview with
William H. Ahern,
portfolio manager of
National Limited Maturity Portfolio.

Q: Bill, how would you characterize the intermediate-term municipal bond market
   in the past year?

A: The intermediate-term market registered a good showing. As a measure of that
   performance, the Lehman Brothers 7-year Municipal Bond Index rose 9.0% in the
   year ended March 31./1/ Continued low inflation and manageable economic
   growth provided a favorable backdrop for bonds in general. The municipal
   market did slightly underperform the Treasury market due to a rise in
   municipal supply. According to the Bond Market Association, municipal
   issuance rose to more than $220 billion in 1997 alone, up from around $190
   billion the previous year.

   Because intermediate-term maturities tend to be less volatile than longer-
   term maturities, the sector predictably lagged the longer-term end of the
   market. But, more importantly, intermediate bonds performed according to
   expectations. Overall, the intermediate market fared very well.

Q: The Fund finished its fiscal year near the top of its competitive universe,
   according to Lipper Analytical Services, Inc., a nationally recognized
   monitor of mutual fund performance./2/ What accounted for the Fund's
   excellent performance?

A: The Fund was helped by several factors. First, given our positive market view
   and favorable outlook on inflation, the Fund maintained a slightly longer
   average maturity. That helped the Fund participate fully in the market rally.

   Second, several bonds purchased in previous periods were escrowed during the
   fiscal year. Escrowed bonds are those that have been advance-refunded by
   their issuers and are backed by Treasury bonds, making them the highest
   quality. When a bond is escrowed, its credit quality is inevitably enhanced.
   The market subsequently places a higher value on these bonds because they no
   longer have credit risk.

   Finally, the Fund benefited from its investments in non-rated bonds. With the
   ongoing compression of quality spreads in recent years, non-rated bonds have
   performed very well. The Portfolio has increased its efforts to find value in
   that segment of the market.

- --------------------------------------------------------------------------------
Portfolio Quality Ratings/3/
- ----------------------------------------

[PIE CHART APPEARS HERE]


Non-Rated         42.3%
Baa               22.8%
A                 12.7%
Aaa               11.7%
Aa                 6.2%
Ba                 4.3%


Portfolio Overview/3/
- ----------------------------------------

Number of Issues                    76
Average Rating                      A-
Average Coupon                   6.45%
Average Effective Maturity  8.69 years
Average Maturity           12 73 years
Average Duration            5.79 years


/1/ It is not possible to invest directly in an Index or Average.

/2/ Lipper rankings are based on total return and do not take sales charges into
consideration. In Lipper's Intermediate Municipal Debt category as of 3/31/98,
EV Marathon National Limited Maturity Fund, Class I and Class II, ranked #14 and
#5, respectively, out of 140 funds for 1 year.

/3/ Because the Portfolio is actively managed, Quality Ratings and Portfolio
Overview are subject to change.

- --------------------------------------------------------------------------------
Mutual fund shares are not insured by the FDIC and are not deposits or other
obligations of, or guaranteed by, any depository institution. Shares are subject
to investment risks, including possible loss of principal invested.
- --------------------------------------------------------------------------------

                                       3
<PAGE>
 
EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998

MANAGEMENT DISCUSSION CONT'D

Q: Where did you concentrate the Portfolio's largest investments?

A: The Portfolio was well-diversified across the municipal bond spectrum.
   Industrial development bonds (IDB) constituted the largest sector weighting.
   A robust economy provided strong support for the projects underlying most IDB
   bonds. Elsewhere, nursing homes represented another large focus. As part of a
   broader, continuing care sector, many non-rated nursing home bonds have fared
   well as quality spreads have narrowed and the sector has taken on increasing
   importance within the overall health care system. Finally, general
   obligations also provided good performance. As the economy has generated
   higher tax revenues, the finances of state and local issuers have improved
   dramatically. The performance of general obligations have reflected that
   improvement.

Q: In what kind of industrial development projects did the Portfolio invest?

A: Typically, IDB projects are tied to commercial activity, and involve the
   construction of facilities for resource recovery, solid waste disposal,
   energy cogeneration, transportation, or port facilities. The Portfolio's IDB
   investments ranged from paper companies such as International Paper Co.,
   industrial manufacturers like Owens-Corning Fiberglass, and transportation
   companies like Holt Hauling.

   The bonds are attractive to investors because they often provide above-
   average income while developing commercial interests that will generate
   further tax revenues for communities. In addition, the bonds often finance
   projects that contribute to cleaner water or air, and thus benefit these
   communities environmentally.

Q: You indicated that nursing homes and life care facilities have played a
   larger part in the Portfolio. Why have you found them attractive investments?

A: From a total health care standpoint, these facilities are playing an
   increasingly critical role. That is especially important in a rapidly aging
   population. Continuing care facilities have been shown to be cost-effective
   and more desirable alternatives for older patients, providing a wide range of
   medical services while giving senior citizens a large measure of
   independence.

   From an investment standpoint, we have devoted a good deal of our municipal
   resources at Eaton Vance toward this sector. The projects are typically
   financed by non-rated bonds, which, because of their higher coupons and the
   potential for credit improvement, provide unusual opportunities for the
   Portfolio.


Your Investment at Work
- -------------------------------------------------------------------------------
 Pennsylvania EDA                                       [GRAPHIC APPEARS HERE]
 Resource Recovery
 Culver Project

 .    These bonds were issued to finance the development of a 102-megawatt,
     waste-coal-fired, power production facility.

 .    The project will generate electricity through the use of 552,000 tons per
     year of bituminous coal refuse left over from decades of coal mining in the
     region. The project is popular because it uses waste products to provide
     energy for the surrounding populations.

 .    This bond, rated BBB- by S&P, represents the efforts of the Portfolio to
     add value through lower-rated, investment-grade bonds that may have further
     upgrade potential.

                                       4
<PAGE>
 
EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998

MANAGEMENT DISCUSSION CONT'D


Q:   You suggested that the intermediate range of the municipal market performed
according to expectations during the past fiscal year. Why is that important to
investors?

A:   Investors are drawn to intermediate-term municipal bonds because they tend
to provide a good percentage of the yield of long-term bonds while limiting
volatility. Conservative, tax-conscious investors characteristically have among
their investment goals the relative stability of principal. Therefore, it's
comforting that, even as they slightly trailed the longer end of the market,
intermediate-term bonds performed as expected.

Q:   What is your outlook for the intermediate-term municipal market in the
coming year?

A:   While there has been virtually no sign of inflation, the Federal Reserve
nonetheless announced a bias toward higher interest rates at its last open
market meeting. Most economists have anticipated that the weakness in the Asian
economies would reduce U.S. growth rates slightly in 1998. However, the economy
continues to expand and, while we are a long way from dangerous inflation, the
growth rate bears watching.

If the Fed deems it necessary to raise interest rates at some point, the bond
market will, naturally, come under pressure. In that event, intermediate-term
municipals will continue to demonstrate the limited volatility that has made
them a favorite of conservative investors. In the meantime, municipal bonds
continue to provide good after-tax income in a high-tax era. In my view,
municipals should be a part of everyone's overall investment program.

           Comparison of Change in Value of a $10,000 Investment in 
          EV Marathon National Limited Maturity Municipals Fund vs. 
                the Lehman Brothers 7-Year Municipal Bond Index

                      May 31, 1992 through March 31, 1998

                           [LINE GRAPH APPEARS HERE]

                                                                Lehman 7-Yr.
                                                                  Municipal 
         Date         Fund-Class I        Fund-Class II          Bond Index  
         ----         ------------        -------------          ----------
        5/31/92         $10,000              $10,000              $10,000
        6/30/92         $10,120              $10,120              $10,159
        7/31/92         $10,459              $10,459              $10,462
        8/31/92         $10,327              $10,327              $10,354
        9/30/92         $10,391              $10,391              $10,438
       10/31/92         $10,274              $10,274              $10,368
       11/30/92         $10,517              $10,517              $10,522
       12/31/92         $10,613              $10,613              $10,608
        1/31/92         $10,722              $10,722              $10,763
        2/28/93         $11,041              $11,041              $11,093
        3/31/93         $10,905              $10,905              $10,947
        4/30/93         $10,983              $10,983              $11,015
        5/31/93         $11,031              $11,031              $11,048
        6/30/93         $11,157              $11,157              $11,250
        7/31/93         $11,180              $11,180              $11,252
        8/31/93         $11,344              $11,344              $11,451
        9/30/93         $11,441              $11,441              $11,577
       10/31/93         $11,464              $11,464              $11,607
       11/30/93         $11,391              $11,391              $11,505
       12/31/93         $11,549              $11,549              $11,716
        1/31/94         $11,652              $11,652              $11,840
        2/28/94         $11,465              $11,465              $11,583
        3/31/94         $11,134              $11,134              $11,274
        4/30/94         $11,193              $11,193              $11,356
        5/31/94         $11,258              $11,258              $11,413
        6/30/94         $11,224              $11,224              $11,392
        7/31/94         $11,357              $11,357              $11,553
        8/31/94         $11,381              $11,381              $11,613
        9/30/94         $11,281              $11,281              $11,502
       10/31/94         $11,171              $11,171              $11,387
       11/30/94         $11,023              $11,023              $11,221
       12/31/94         $11,180              $11,180              $11,391
        1/31/95         $11,369              $11,369              $11,604
        2/28/95         $11,556              $11,556              $11,866
        3/31/95         $11,627              $11,627              $11,989
        4/30/95         $11,635              $11,635              $12,021
        5/31/95         $11,821              $11,821              $12,341
        6/30/95         $11,780              $11,780              $12,330
        7/31/95         $11,880              $11,880              $12,487
        8/31/95         $11,965              $11,965              $12,634
        9/30/95         $12,029              $12,029              $12,683
       10/31/95         $12,117              $12,117              $12,793
       11/30/95         $12,227              $12,227              $12,934
       12/31/95         $12,279              $12,279              $13,003
        1/31/96         $12,368              $12,368              $13,129
        2/28/96         $12,302              $12,302              $13,084
        3/31/96         $12,151              $12,151              $12,956
        4/30/96         $12,133              $12,133              $12,932
        5/31/96         $12,113              $12,113              $12,913
        6/30/96         $12,148              $12,148              $13,012
        7/31/96         $12,201              $12,192              $13,120
        8/31/96         $12,232              $12,232              $13,127
        9/30/96         $12,351              $12,358              $13,246
       10/31/96         $12,442              $12,456              $13,388
       11/30/96         $12,647              $12,656              $13,612
       12/31/96         $12,569              $12,598              $13,570
        1/31/97         $12,538              $12,575              $13,619
        2/28/97         $12,662              $12,708              $13,732
        3/31/97         $12,553              $12,604              $13,554
        4/30/97         $12,658              $12,717              $13,624
        5/31/97         $12,803              $12,870              $13,795
        6/30/97         $12,900              $12,976              $13,927
        7/31/97         $13,133              $13,218              $14,249
        8/31/97         $13,053              $13,145              $14,149
        9/30/97         $13,163              $13,264              $14,298
       10/31/97         $13,221              $13,330              $14,383
       11/30/97         $13,296              $13,415              $14,434
       12/31/97         $13,493              $13,620              $14,610
        1/31/98         $13,669              $13,806              $14,763
        2/28/98         $13,706              $13,852              $14,777
        3/31/98         $13,747              $13,928              $14,777


<TABLE>
<CAPTION>
Performance+
- -----------------------------------------------------------------------------------
Average Annual Total Returns (at net asset value)
- -----------------------------------------------------------------------------------
                                                            Class I   Class II
                                                           ---------  ---------
<S>                                                        <C>        <C>
One Year                                                        9.5%      10.5%
Five Years                                                      4.7        5.0
Life of Fund (5/22/92)                                          5.6        5.8

SEC Average Annual Total Returns (including applicable CDSC)
- -----------------------------------------------------------------------------------
                                                              Class I   Class II
                                                              -------   --------
One Year                                                        6.5%      10.5%
Five Years                                                      4.7        5.0
Life of Fund (5/22/92)                                          5.6        5.8
 
</TABLE>
*   Source: Towers Data Systems, Bethesda, MD.

  The chart compares the Fund's total return with that of the Lehman Brothers 7-
  year Municipal Bond Index, a broad-based, unmanaged market index of
  intermediate-maturity municipal bonds. Returns are calculated by determining
  the percentage change in net asset value (NAV) with all distributions
  reinvested. The lines on the chart represent the total returns of $10,000
  hypothetical investments in the Fund and the Index. The Index's total return
  does not reflect commissions or expenses that would have been incurred if an
  investor individually purchased or sold the securities represented in the
  Index. It is not possible to invest directly in an Index.

  + Returns are calculated by determining the percentage change in net asset
  value (NAV) with all distributions reinvested. SEC returns for Class I shares
  reflect applicable CDSC based on the following schedule: 3%-1st year; 2.5%-2nd
  year; 2%-3rd year; 1%-4th year.

  Past performance is no guarantee of future results. Investment return and
  principal value will fluctuate so that shares, when redeemed, may be worth
  more or less their original cost.

  Federal income tax information on distributions. For Federal income tax
  purposes, 99.76% of the total dividends paid by the Fund from net investment
  income during the year ended March 31, 1998 is designated as an exempt-
  interest dividend.

                                       5
<PAGE>

EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998

- --------------------------------------------------------------------------------
FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------

Statement of Assets and Liabilities                        


As of March 31, 1998
Assets
- --------------------------------------------------------------------------------
Investment in National Limited Maturity Municipals Portfolio,
     at value (Note 1A) (identified cost, $67,801,856)              $72,460,515
Receivable for Fund shares sold                                         457,700
- --------------------------------------------------------------------------------
Total assets                                                        $72,918,215
- --------------------------------------------------------------------------------


Liabilities
- --------------------------------------------------------------------------------
Payable for Fund shares redeemed                                    $ 1,242,177
Dividends payable                                                        87,644
Payable to affiliate for Trustees' fees (Note 4)                            474
Accrued expenses                                                         58,472
- --------------------------------------------------------------------------------
Total liabilities                                                   $ 1,388,767
- --------------------------------------------------------------------------------
Net Assets                                                          $71,529,448
- --------------------------------------------------------------------------------


Sources of Net Assets
- --------------------------------------------------------------------------------
Paid-in capital                                                     $69,905,147
Accumulated net realized loss on investments from
     Portfolio (computed on the basis of identified cost)            (3,174,803)
- --------------------------------------------------------------------------------
Accumulated undistributed net investment income                         140,445
- --------------------------------------------------------------------------------
Net unrealized appreciation of investments from Portfolio
     (computed on the basis of identified cost)                       4,658,659
- --------------------------------------------------------------------------------
Total                                                               $71,529,448
- --------------------------------------------------------------------------------


Net Asset Value, Offering and Redemption
Price Per Share (Note 6)
- --------------------------------------------------------------------------------
Class I Shares
     Net Asset Value per share
     ($11,537,729 / 1,090,562 shares of beneficial
     interest outstanding)                                          $     10.58
- --------------------------------------------------------------------------------
Class II Shares
     Net Asset Value per share
     ($59,991,719 / 5,668,368 shares of beneficial
     interest outstanding)                                          $     10.58
- --------------------------------------------------------------------------------


Statement of Operations


For the Year Ended
March 31, 1998
Investment Income (Note 1B)
- --------------------------------------------------------------------------------
Interest income allocated from Portfolio                            $ 4,825,124
Expenses allocated from Portfolio                                      (466,786)
- --------------------------------------------------------------------------------
Net investment income from Portfolio                                $ 4,358,338
- --------------------------------------------------------------------------------


Expenses
- --------------------------------------------------------------------------------
Compensation of Trustees not members of the
     Administrator's organization (Note 4)                          $     1,747
Distribution and service fees (Note 5)
     Class I                                                            262,448
     Class II                                                            73,916
Transfer and dividend disbursing agent fees                              71,414
Registration fees                                                        43,069
Legal and accounting services                                            23,490
Printing and postage                                                     17,167
Custodian fee                                                            14,884
Amortization of organization expenses (Note 1D)                           1,745
Miscellaneous                                                            10,391
- --------------------------------------------------------------------------------
Total expenses                                                      $   520,271
- --------------------------------------------------------------------------------


Net investment income                                               $ 3,838,067
- --------------------------------------------------------------------------------


Realized and Unrealized
Gain (Loss) from Portfolio
- --------------------------------------------------------------------------------
Net realized gain (loss) --
     Investment transactions (identified cost basis)                $   872,800
     Financial futures contracts                                       (996,847)
- --------------------------------------------------------------------------------
Net realized loss on investment transactions                        $  (124,047)
- --------------------------------------------------------------------------------
Change in unrealized appreciation (depreciation) --
     Investments                                                    $ 3,965,622
     Financial futures contracts                                       (133,286)
- --------------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation)
     of investments                                                 $ 3,832,336
- --------------------------------------------------------------------------------


Net realized and unrealized gain on investments                     $ 3,708,289
- --------------------------------------------------------------------------------


Net increase in net assets from operations                          $ 7,546,356
- --------------------------------------------------------------------------------



                       See notes to financial statements

                                       6

<PAGE>
EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998
FINANCIAL STATEMENTS CONT'D
Statements of Changes in Net Assets



Increase (Decrease)                        Year Ended           Year Ended
in Net Assets                              March 31, 1998       March 31, 1997
- --------------------------------------------------------------------------------
From operations --
     Net investment income                 $    3,838,067      $     4,469,825
     Net realized loss on
         investment transactions                 (124,047)            (848,389)
     Net change in unrealized
         appreciation (depreciation)
         of investments                         3,832,336             (243,948)
- --------------------------------------------------------------------------------
Net increase in net assets
      from operations                      $    7,546,356      $     3,377,488
- --------------------------------------------------------------------------------
Distributions to shareholders (Note 2) --
     From net investment income
         Class I                           $   (1,219,304)     $    (3,425,235)
         Class II                              (2,409,865)            (913,947)
- --------------------------------------------------------------------------------
Total distributions to shareholders        $   (3,629,169)     $    (4,339,182)
- --------------------------------------------------------------------------------
Transactions in shares of beneficial
     interest (Note 3) --
     Proceeds from sale of shares
         Class I                           $    2,211,837      $     4,275,736
     Net asset value of shares
         issued to shareholders in
         payment of
         distributions declared
         Class I                                  671,538            1,811,549
         Class II                                 894,751              295,465
     Cost of shares redeemed
         Class I                               (6,283,507)         (24,654,777)
         Class II                             (15,646,244)          (7,029,741)
     Net asset value of shares
         exchanged
         Class I                              (35,328,625)         (43,941,246)
         Class II                              35,328,625           43,941,246
- --------------------------------------------------------------------------------
Net decrease in net assets from Fund
     share transactions                    $  (18,151,625)     $   (25,301,768)
- --------------------------------------------------------------------------------


Net decrease in net assets                 $  (14,234,438)     $   (26,263,462)
- --------------------------------------------------------------------------------


Net Assets
- --------------------------------------------------------------------------------
At beginning of year                       $   85,763,886      $   112,027,348
- --------------------------------------------------------------------------------
At end of year                             $   71,529,448      $    85,763,886
- --------------------------------------------------------------------------------


Accumulated undistributed
(distributions in excess of)
net investment income
included in net assets
- --------------------------------------------------------------------------------
At end of year                             $      140,445      $       (68,453)
- --------------------------------------------------------------------------------

                       See notes to financial statements
                                       7
<PAGE>

EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998

FINANCIAL STATEMENTS CONT'D

Financial Highlights

<TABLE> 
<CAPTION> 
                                                                                   Year Ended March 31,
                                                               ------------------------------------------------------------------
                                                                          1998                             1997                  
                                                               --------------------------       ---------------------------------
                                                                Class I         Class II         Class I         Class II*
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                                            <C>              <C>             <C>              <C> 
Net asset value --  Beginning of year                          $  10.070        $  10.070       $  10.170        $  10.030       
- ---------------------------------------------------------------------------------------------------------------------------------


Income from operations
- ---------------------------------------------------------------------------------------------------------------------------------
Net investment income                                          $   0.454+++     $   0.527       $   0.428        $   0.393       
Net realized and unrealized gain (loss) on investments             0.488            0.488          (0.098)           0.033++     
- ---------------------------------------------------------------------------------------------------------------------------------
Total income from operations                                   $   0.942        $   1.015       $   0.330        $   0.426       
- ---------------------------------------------------------------------------------------------------------------------------------


Less distributions
- ---------------------------------------------------------------------------------------------------------------------------------
From net investment income                                     $  (0.432)       $  (0.505)      $  (0.430)       $  (0.386)      
In excess of net investment income                                   --               --              --               --        
From net realized gain on investments                                --               --              --               --        
- ---------------------------------------------------------------------------------------------------------------------------------
Total distributions                                            $  (0.432)       $  (0.505)      $  (0.430)       $  (0.386)      
- ---------------------------------------------------------------------------------------------------------------------------------


Net asset value -- End of year                                 $  10.580        $  10.580       $  10.070        $  10.070       
- ---------------------------------------------------------------------------------------------------------------------------------


Total Return/(1)/                                                   9.52%           10.50%           3.30%            4.06%      
- ---------------------------------------------------------------------------------------------------------------------------------


Ratios/Supplemental Data
- ---------------------------------------------------------------------------------------------------------------------------------
Net assets, end of year (000's omitted)                        $  11,538        $  59,992       $  48,692        $  37,072       
Ratio of expenses to average daily net assets/(2)(3)/               1.73%            0.99%           1.69%            0.99%+     
Ratio of expenses to average daily net assets after custodian
     fee reduction/(2)/                                             1.72%            0.98%           1.67%            0.97%+     
Ratio of net investment income to average daily net assets          4.42%            5.16%           4.37%            5.14%+     
- ---------------------------------------------------------------------------------------------------------------------------------
<CAPTION> 
                                                                             Year Ended March 31,
                                                               ---------------------------------------------------
                                                                  1996              1995              1994
                                                               ---------------------------------------------------
<S>                                                            <C>               <C>               <C> 
Net asset value --  Beginning of year                          $   10.130        $   10.160        $   10.450
- ------------------------------------------------------------------------------------------------------------------


Income from operations
- ------------------------------------------------------------------------------------------------------------------
Net investment income                                          $    0.413        $    0.400        $    0.406
Net realized and unrealized gain (loss) on investments              0.040             0.033            (0.178)
- ------------------------------------------------------------------------------------------------------------------
Total income from operations                                   $    0.453        $    0.433        $    0.228
- ------------------------------------------------------------------------------------------------------------------


Less distributions
- ------------------------------------------------------------------------------------------------------------------
From net investment income                                     $   (0.413)       $   (0.400)       $   (0.406)
In excess of net investment income                                     --            (0.058)           (0.091)
From net realized gain on investments                                  --            (0.005)           (0.021)
- ------------------------------------------------------------------------------------------------------------------
Total distributions                                            $   (0.413)       $   (0.463)       $   (0.518)
- ------------------------------------------------------------------------------------------------------------------


Net asset value -- End of year                                 $   10.170        $   10.130        $   10.160
- ------------------------------------------------------------------------------------------------------------------


Total Return/(1)/                                                    4.51%             4.43%             2.10%
- ------------------------------------------------------------------------------------------------------------------
                                                                          
                                                                          
Ratios/Supplemental Data                                                  
- ------------------------------------------------------------------------------------------------------------------
Net assets, end of year (000's omitted)                        $  112,027        $  141,289        $  151,787
Ratio of expenses to average daily net assets/(2)(3)/                1.64%             1.57%             1.46%
Ratio of expenses to average daily net assets after custodian
     fee reduction/(2)/                                              1.63%               --                --
Ratio of net investment income to average daily net assets           4.04%             3.99%             3.78%
- ------------------------------------------------------------------------------------------------------------------
</TABLE> 

+    Annualized.
++   The per share amount is not in accord with the net realized and unrealized
     gains and losses for the period because of the timing of sales of Fund
     shares and the amount of the per share realized and unrealized gains and
     losses at such time.
+++  Computed using average shares outstanding.
*    For the period from the start of business, June 27, 1996, to March 31,
     1997.
(1)  Total return is calculated assuming a purchase at the net asset value on
     the first day and a sale at the net asset value on the last day of each
     period reported. Dividends and distributions, if any, are assumed to be
     reinvested at the net asset value on the reinvestment date. Total return is
     not computed on an annualized basis.
(2)  Includes the Fund's share of its corresponding Portfolio's allocated
     expenses.
(3)  The expense ratios for the year ended March 31, 1996 and periods thereafter
     have been adjusted to reflect a change in reporting requirements. The new
     reporting guidelines require the Fund, as well as its corresponding
     Portfolio, to increase its expense ratio by the effect of any expense
     offset arrangements with its service providers. The expense ratios for each
     of the prior periods have not been adjusted to reflect this change.


                       See notes to financial statements

                                       8
<PAGE>
 
EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998

NOTES TO FINANCIAL STATEMENTS


1  Significant Accounting Policies
   -----------------------------------------------------------------------------
   EV Marathon National Limited Maturity Municipals Fund (the Fund) is a
   diversified series of Eaton Vance Investment Trust (the Trust). The Trust is
   an entity of the type commonly known as a Massachusetts business trust and is
   registered under the Investment Company Act of 1940, as amended, as an
   open-end management investment company. The Fund has two classes of shares.
   Class I shares are sold at net asset value and are subject to a contingent
   deferred sales charge (See Note 6). Class I shares held for the longer of (i)
   four years or (ii) the time at which the contingent deferred sales charge
   applicable to such shares expires will automatically convert to Class II
   shares. All classes of shares have equal rights as to assets and voting
   privileges. Realized and unrealized gains or losses and net investment
   income, other than class specific expenses, are allocated daily to each class
   of shares based on the relative net assets of each class to the total net
   assets of the Fund. Each class of shares differs in its distribution plan and
   certain other class specific expenses. The Fund invests all of its investable
   assets in interests in the National Limited Maturity Municipals Portfolio
   (the Portfolio), a New York Trust, having the same investment objective as
   the Fund. The value of the Fund's investment in the Portfolio reflects the
   Fund's proportionate interest in the net assets of the Portfolio (77.8% at
   March 31, 1998). The performance of the Fund is directly affected by the
   performance of the Portfolio. The financial statements of the Portfolio,
   including the portfolio of investments, are included elsewhere in this report
   and should be read in conjunction with the Fund's financial statements. The
   following is a summary of significant accounting policies consistently
   followed by the Fund in the preparation of its financial statements. The
   policies are in conformity with generally accepted accounting principles.

   On June 23, 1997, the Board of Trustees of the Trust adopted a multiple class
   plan for the Fund which permits the Fund to issue more than one class of
   shares. Initially, the Fund will offer three classes of shares and, effective
   April 1, 1998 the existing Class I and Class II shares of the Fund will be
   designated Class B and Class A shares, respectively. On June 23, 1997, the
   Board of Trustees also approved a Plan of Reorganization (the "Plan") for the
   Trust. Under the terms of the Plan, the Fund will acquire substantially all
   of the assets and liabilities of EV Traditional National Limited Maturity
   Municipals Fund (the "Traditional Fund") and EV Classic National Limited
   Maturity Municipals Fund (the "Classic Fund"). The transaction will be
   structured for tax purposes to qualify as a tax-free reorganization under the
   Internal Revenue Code.

   As a result of the reorganization, shareholders of the Traditional Fund will
   receive Class A shares and shareholders of the Classic Fund will receive
   Class C shares of the Fund. The reorganization will occur after the close of
   business, March 31, 1998.

   A Investment Valuation -- Valuation of securities by the Portfolio is
   discussed in Note 1A of the Portfolio's Notes to Financial Statements which
   are included elsewhere in this report.

   B Income -- The Fund's net investment income consists of the Fund's pro rata
   share of the net investment income of the Portfolio, less all actual and
   accrued expenses of the Fund determined in accordance with generally accepted
   accounting principles.

   C Federal Taxes -- The Fund's policy is to comply with the provisions of the
   Internal Revenue Code applicable to regulated investment companies and to
   distribute to shareholders each year all of its taxable and tax-exempt
   income, including any net realized gain on investments. Accordingly, no
   provision for federal income or excise tax is necessary. At March 31, 1998,
   the Fund, for federal income tax purposes, had a capital loss carryover of
   $3,444,118 which will reduce the taxable income arising from future net
   realized gain on investments, if any, to the extent permitted by the Internal
   Revenue Code and thus will reduce the amount of distributions to shareholders
   which would otherwise be necessary to relieve the Fund of any liability for
   federal income tax. Such capital loss carryover will expire on March 31, 2003
   ($1,638,170), March 31, 2004 ($769,552), March 31, 2005 ($773,836), and 
   March 31, 2006 ($262,560). Dividends paid by the Fund from net interest on
   tax-exempt municipal bonds allocated from the Portfolio are not includable by
   shareholders as gross income for federal income tax purposes because the Fund
   and Portfolio intend to meet certain requirements of the Internal Revenue
   Code applicable to regulated investment companies which will enable the Fund
   to pay exempt-interest dividends. The portion of such interest, if any,
   earned on private activity bonds issued after August 7, 1986, may be
   considered a tax preference item to shareholders.

   D Deferred Organization Expenses -- Costs incurred by the Fund in connection
   with its organization are being amortized on the straight-line basis over
   five years.

   E Use of Estimates -- The preparation of financial statements in conformity
   with generally accepted accounting principles requires management to make

                                       9
<PAGE>
 
EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998

NOTES TO FINANCIAL STATEMENTS CONT'D


   estimates and assumptions that affect the reported amounts of assets and
   liabilities at the date of the financial statements and the reported amounts
   of revenue and expense during the reporting period. Actual results could
   differ from those estimates.

   F Expense Reduction -- Investors Bank & Trust Company (IBT) serves as
   custodian to the Fund and the Portfolio. Pursuant to the respective custodian
   agreements, IBT receives a fee reduced by credits which are determined based
   on the average daily cash balances the Fund or the Portfolio maintains with
   IBT. All significant credit balances used to reduce the Fund's custodian fees
   are reported as a reduction of operating expenses on the Statement of
   Operations.

   G Other -- Investment transactions are accounted for on a trade date basis.


2  Distributions to Shareholders
   ----------------------------------------------------------------------------
   The net income of the Fund is determined daily and substantially all of the
   net income so determined is declared as a dividend to shareholders of record
   at the time of declaration. Dividends are declared separately for each class
   of shares. Distributions are paid monthly. Distributions of allocated
   realized capital gains, if any, are made at least annually. Shareholders may
   reinvest capital gain distributions in additional shares of the same class of
   the Fund at the net asset value as of the reinvestment date. Distributions
   are paid in the form of additional shares of the same class or, at the
   election of the shareholder, in cash. The Fund distinguishes between
   distributions on a tax basis and a financial reporting basis. Generally
   accepted accounting principles require that only distributions in excess of
   tax basis earnings and profits be reported in the financial statements as a
   return of capital. Differences in the recognition or classification of income
   between the financial statements and tax earnings and profits which result in
   over distributions for financial statement purposes only are classified as
   distributions in excess of net investment income or accumulated net realized
   gains. Permanent differences between book and tax accounting relating to
   distributions are reclassified to paid-in capital.


3  Shares of Beneficial Interest
   -----------------------------------------------------------------------------
   The Declaration of Trust permits the Trustees to issue an unlimited number of
   full and fractional shares of beneficial interest (without par value). Such
   shares may be issued in a number of different classes. Transactions in Class
   I and II shares were as follows:




                                                      Year Ended March 31,
                                               ---------------------------------
   Class I                                               1998         1997
   -----------------------------------------------------------------------------
     Sales                                              212,978      422,835

     Issued to shareholders electing to
       receive payments of distributions in
       Fund shares                                       65,151      179,046

     Redemptions                                       (609,705)  (2,435,330)

     Exchange to Class II shares                     (3,411,349)  (4,344,898)
   -----------------------------------------------------------------------------

     Net decrease                                    (3,742,925)  (6,178,347)
   -----------------------------------------------------------------------------


                                                      Year Ended March 31,
                                               ---------------------------------
   Class II                                              1998         1997
   -----------------------------------------------------------------------------
     Sales                                                   --           --

     Issued to shareholders electing to
       receive payments of distributions in
       Fund shares                                       86,113       29,088

     Redemptions                                     (1,509,686)    (693,394)

     Exchange from Class I shares                     3,411,349    4,344,898
   -----------------------------------------------------------------------------

     Net increase                                     1,987,776    3,680,592
   -----------------------------------------------------------------------------


4  Transactions with Affiliates
   -----------------------------------------------------------------------------
   Eaton Vance Management (EVM) serves as the administrator of the Fund, but
   receives no compensation. The Portfolio has engaged Boston Management and
   Research (BMR), a subsidiary of EVM, to render investment advisory services.
   See Note 2 of the Portfolio's Notes to Financial Statements which are
   included elsewhere in this report. Certain of the officers and Trustees of
   the Fund and the Portfolio are officers and directors/trustees of the above
   organizations. Except as to Trustees of the Fund and the Portfolio who are
   not members of EVM's organization, officers and Trustees receive remuneration
   for their services to the Fund out of such investment adviser fee.

                                       10
<PAGE>
 
EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998

NOTES TO FINANCIAL STATEMENTS CONT'D


5  Distribution Plan
   -----------------------------------------------------------------------------
   The Fund has adopted a distribution plan (the Plan) pursuant to Rule 12b-1
   under the Investment Company Act of 1940. The Plan requires the Fund to pay
   the Principal Underwriter, Eaton Vance Distributors, Inc. (EVD) amounts equal
   to 1/365 of 0.75% of the Fund's Class I daily net assets, for providing
   ongoing distribution services and facilities to the Fund. The Fund will
   automatically discontinue payments to EVD during any period in which there
   are no outstanding Uncovered Distribution Charges, which are equivalent to
   the sum of (i) 3% of the aggregate amount received by the Fund for Class I
   shares sold plus, (ii) distribution fees calculated by applying the rate of
   1% over the prevailing prime rate to the outstanding balance of Uncovered
   Distribution Charges of EVD reduced by the aggregate amount of contingent
   deferred sales charges (see Note 6) and daily amounts theretofore paid to
   EVD. The Fund paid or accrued $219,847 as payable to EVD for the year ended
   March 31, 1998, representing 0.75% of average daily net assets attributable
   to Class I shares. At March 31, 1998, the amount of Uncovered Distribution
   Charges EVD calculated under the Plan was approximately $352,000.

   In addition, the Plan authorizes the Fund to make payments of service fees to
   the Principal Underwriter, Authorized Firms and other persons in amounts not
   exceeding 0.25% of the Fund's average daily net assets for each fiscal year.
   The Trustees have initially implemented the Plan by authorizing the Fund to
   make quarterly payments of service fees to the Principal Underwriter and
   Authorized Firms in amounts not expected to exceed 0.15% per annum of the
   Fund's average daily net assets attributable to both Class I and Class II
   shares based on the value of Fund shares sold by such persons and remaining
   outstanding for at least one year. Service fee payments will be made for
   personal services and/or the maintenance of shareholder accounts. Service
   fees are separate and distinct from the sales commissions and distribution
   fees payable by the Fund to EVD, and, as such are not subject to automatic
   discontinuance where there are no outstanding Uncovered Distribution Charges
   of EVD. Service fee payments for the year ended March 31, 1998 amounted to
   $42,601 for Class I shares and $73,916 for Class II shares.

   Certain officers and Trustees of the Fund are officers or directors of EVD.


6  Contingent Deferred Sales Charge
   -----------------------------------------------------------------------------
   A contingent deferred sales charge (CDSC) is imposed on any redemption of
   Class I shares made within four years of purchase. Generally, the CDSC is
   based upon the lower of the net asset value at date of redemption or date of
   purchase. No charge is levied on Class I shares acquired by reinvestment of
   dividends or capital gains distributions. The CDSC is imposed at declining
   rates that begin at 3% in the case of redemptions in the first year of
   purchase. No CDSC is levied on shares which have been sold to EVM or its
   affiliates or to their respective employees. CDSC charges are paid to EVD to
   reduce the amount of Uncovered Distribution Charges calculated under the
   Fund's Distribution Plan (See Note 5). CDSC charges received when no
   Uncovered Distribution Charges exist will be credited to the Fund. EVD
   received approximately $60,000 of CDSC paid by shareholders of Class I shares
   for the year ended March 31, 1998.


7  Investment Transactions
   -----------------------------------------------------------------------------
   Increases and decreases in the Fund's investment in the Portfolio for the
   year ended March 31, 1998, aggregated $37,237,738 and $58,900,104,
   respectively.


8  Subsequent Event
   -----------------------------------------------------------------------------
   Effective April 1, 1998, the Fund will change its name to Eaton Vance
   National Limited Maturity Municipals Fund. Class I shares of the Fund will be
   designated as Class B shares and Class II shares will be designated as Class
   A shares. One additional class of shares is also offered.

                                       11
<PAGE>
EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998
INDEPENDENT AUDITORS' REPORT



To the Trustees and Shareholders
of Eaton Vance Investment Trust:

- -------------------------------------------------------------------------------
We have audited the accompanying statement of assets and liabilities of EV
Marathon National Limited Maturity Municipals Fund (one of the series
constituting the Eaton Vance Investment Trust) as of March 31, 1998, the related
statement of operations for the year then ended, the statements of changes in
net assets for the years ended March 31, 1998 and 1997 and the financial
highlights for each of the years in the five-year period ended March 31, 1998.
These financial statements and financial highlights are the responsibility of
the Trust's management. Our responsibility is to express an opinion on these
financial statements and financial highlights based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion. 

In our opinion, such financial statements and financial highlights present
fairly, in all material respects, the financial position of EV Marathon National
Limited Maturity Municipals Fund at March 31, 1998, the results of its
operations, the changes in its net assets and its financial highlights for the
respective stated periods in conformity with generally accepted accounting
principles.

                                                           DELOITTE & TOUCHE LLP
                                                           Boston, Massachusetts
                                                           May 1, 1998

                                      12
<PAGE>

National Limited Maturity Municipals Portfolio as of March 31, 1998

PORTFOLIO OF INVESTMENTS


Tax-Exempt Investments -- 100.0%

                        
Ratings (Unaudited)                                                   
- --------------------    Principal 
                        Amount    
            Standard    (000's
Moody's     & Poor's    omitted)     Security                         Value
- --------------------------------------------------------------------------------

Assisted Living -- 1.2%
- --------------------------------------------------------------------------------
 NR          NR         $ 1,000      New Jersey Economic 
                                     Development Authority, 
                                     (Chelsea at East Brunswick), 
                                     (AMT), 8.00%, 10/1/07        $   1,107,710
- --------------------------------------------------------------------------------
                                                                  $   1,107,710
- --------------------------------------------------------------------------------

Cogeneration -- 4.3%
- --------------------------------------------------------------------------------
 NR          BBB        $   650      Eastern Connecticut Resource
                                     Recovery Authority, 
                                     (Wheelabrator Lisbon), 
                                     (AMT), 5.50%, 1/1/20         $     643,435

 NR          BBB-         1,120      New Jersey EDA, (Trigen-
                                     Trenton), (AMT), 6.10%, 
                                     12/1/05                          1,207,102

 NR          BB+          1,250      New Jersey EDA, (Vineland 
                                     Cogeneration) (AMT), 
                                     7.875%, 6/1/19                   1,376,313

 NR          NR             500      Palm Beach County, FL, 
                                     Okeelanta Power Project, 
                                     (AMT), 6.85%, 2/15/21              400,000

 NR          NR             500      Palm Beach County, FL, 
                                     Osceola Power Project, 
                                     (AMT), 6.95%, 1/1/22               395,000
- --------------------------------------------------------------------------------
                                                                  $   4,021,850
- --------------------------------------------------------------------------------

Colleges and Universities -- 1.2%
- --------------------------------------------------------------------------------
 Aa          AA-        $ 1,700      University of Illinois, 
                                     0.00%,  4/1/15               $     707,948 

 Aa          AA-          1,000      University of Illinois, 
                                     0.00%, 4/1/16                      394,140 
- --------------------------------------------------------------------------------
                                                                  $   1,102,088
- --------------------------------------------------------------------------------

Economic Development Revenue -- 1.0%
- --------------------------------------------------------------------------------
 NR          BB-        $   950      Michigan State Strategic 
                                     Fund, 6.25%, 8/1/12          $     981,065
- --------------------------------------------------------------------------------
                                                                  $     981,065
- --------------------------------------------------------------------------------

Education -- 1.2%
- --------------------------------------------------------------------------------
 Ba1         NR         $ 1,000      New Hampshire Higher 
                                     Education and Health 
                                     Facilities Authority
                                     (Colby-Sawyer College), 
                                     7.20%, 6/1/12                $   1,086,240 
- --------------------------------------------------------------------------------
                                                                  $   1,086,240
- --------------------------------------------------------------------------------
Escrowed / Prerefunded -- 10.7%
- --------------------------------------------------------------------------------
 Aaa         AAA        $ 1,500      Grand Ledge, MI, Public 
                                     School District, (MBIA), 
                                     Prerefunded to 5/1/04, 
                                     7.875%, 5/1/11               $   1,809,690

 NR          NR           3,500      Maricopa County, AZ, IDA,
                                     Multifamily, 6.45%, 1/1/17       3,954,964

 NR          NR             990      Maricopa County, AZ, IDA,
                                     Multifamily, 7.876%, 1/1/11      1,194,683

 Aaa         NR           3,000      Massachusetts Turnpike 
                                     Authority, 5.00%, 
                                     1/1/20/(1)/                      2,990,759
- --------------------------------------------------------------------------------

                                                                  $   9,950,096
- --------------------------------------------------------------------------------

General Obligations -- 11.7%
- --------------------------------------------------------------------------------
 Baa2        BBB+       $ 4,000      Detroit, MI, 6.50%, 
                                     4/1/02/(2)/                  $   4,306,559

 Aa1         AA+            750      Ohio State, 0.00%, 8/1/08          468,068

 NR          NR           1,800      Pennsylvania Economic 
                                     Development Financing 
                                     Authority, (Resource 
                                     Recovery for Northampton), 
                                     6.75%, 1/1/07                    1,966,824

 Baa1        A            1,500      Puerto Rico Aqueduct and 
                                     Sewer Authority, 5.00%, 
                                     7/1/15                           1,474,365

 NR          NR           2,540      Youngstown, OH, County 
                                     School District, 6.40%, 
                                     7/1/00                           2,633,802
- --------------------------------------------------------------------------------
                                                                  $  10,849,618
- --------------------------------------------------------------------------------

Hospitals -- 10.0%
- --------------------------------------------------------------------------------
 NR          NR         $ 1,900      Colorado Health Facilities
                                     Authority, (Steamboat 
                                     Springs Health), 5.00%, 
                                     9/15/03                      $   1,914,839 

 NR          NR             500      Colorado Health Facilities
                                     Authority, (Steamboat 
                                     Springs Health), 5.30%, 
                                     9/15/09                            500,625
                                     
 Baa3        NR           1,340      Massachusetts Health and
                                     Educational Facilities 
                                     Authority, (Milford-
                                     Whitinsville Hospital),
                                     Series B, 7.125%, 7/15/02        1,427,328

 NR          BBB            500      Michigan State Hospital 
                                     (Gratiot Community Hospital),
                                     6.10%, 10/1/07                     539,310

 NR          BB-            500      New Hampshire Higher 
                                     Educational And Health 
                                     Facilities Authority, 
                                     (Littleton Hospital 
                                     Association), 5.45%, 5/1/08        502,865


                       See notes to financial statements

                                       13
<PAGE>
 
National Limited Maturity Municipals Portfolio as of March 31, 1998 

PORTFOLIO OF INVESTMENTS CONT'D


Ratings (Unaudited) 
- --------------------    Principal                                               
                        Amount
            Standard    (000's
Moody's     & Poor's    omitted)     Security                         Value
- --------------------------------------------------------------------------------

Hospitals (continued)
- --------------------------------------------------------------------------------
 NR          BBB-       $ 1,390      New Hampshire Higher 
                                     Educational And Health 
                                     Facilities Authority,
                                     (Monadnock Community 
                                     Hospital), 5.60%, 10/1/12    $   1,412,991

 Baa         BBB-         1,830      Richardson, TX, Hospital
                                     Authority, (Richardson 
                                     Medical Center),                       
                                     6.50%, 12/1/12                   1,969,867

 NR          BBB            500      Valley, AL, Special Tax 
                                     Care Facilities Financing 
                                     Authority, (Lanier Memorial 
                                     Hospital), 5.45%, 11/1/11          502,320

 NR          BBB            530      Valley, AL, Special Tax
                                     Care Facilities Financing 
                                     Authority, (Lanier Memorial 
                                     Hospital), 5.50%, 11/1/07          546,902
- --------------------------------------------------------------------------------
                                                                  $   9,317,047
- --------------------------------------------------------------------------------

Housing -- 5.8%
- --------------------------------------------------------------------------------
 A2          NR         $ 1,005      Illinois Development Finance
                                     Authority, Elderly Housing,
                                     (Mattoon Tower), (Section     
                                     8), 6.35%, 7/1/10            $   1,045,059
                                     
 Baa3        NR           1,035      Illinois Development Finance
                                     Authority, Elderly Housing, 
                                     (Rome Meadows), 6.40%, 
                                     2/1/03                           1,065,129

 Baa3        NR           1,145      Illinois Development Finance
                                     Authority, Elderly Housing, 
                                     (Rome Meadows), 6.65%, 2/1/06    1,187,239

 Aa2         AA           2,000      Wisconsin Housing and 
                                     Economic Development Auth-
                                     ority, (Home Ownership), 
                                     (AMT), 6.45%, 9/1/27             2,137,560
- --------------------------------------------------------------------------------
                                                                  $   5,434,987
- --------------------------------------------------------------------------------

Industrial Development Revenue/
Pollution Control Revenue -- 18.1%
- --------------------------------------------------------------------------------
 NR          NR         $   690      Austin, TX (Cargoport 
                                     Development LLC) (AMT), 
                                     7.50%, 10/1/07               $     735,071

 NR          NR             455      Austin, TX (Cargoport 
                                     Development LLC) (AMT), 
                                     8.30%, 10/1/21                     506,602

 A1          NR           1,060      Boise, ID, (Western Trailer 
                                     Co.), (LOC: First Security 
                                     Bank), (AMT), 5.05%, 9/1/06      1,047,439

 NR          BBB-         1,000      Clark County, NV, (Nevada 
                                     Power Co.), (AMT), 5.90%, 
                                     10/1/30                          1,026,170

 A3          A-           1,000      Columbus, NC (International 
                                     Paper Co.), 5.80%, 12/1/16       1,048,340

 A3          A-             750      Essex County, NY, LOC,
                                     (International Paper Co.), 
                                     (AMT), 5.70%, 7/1/16               800,850

 NR          NR             900      Iowa Finance Authority,
                                     Commercial Development 
                                     Revenue, (Southbridge Mall), 
                                     6.375%, 12/1/13                    906,129

 NR          NR           3,445      Jackson, TN, Solid Waste 
                                     Disposal (Owens-Corning 
                                     Fiberglass), (AMT), 6.25%, 
                                     3/31/04/(2)/                     3,564,472

 A3          A-             500      Jones County, (International
                                     Paper Co.), 5.80%, 10/1/21         514,810

 NR          NR             500      Kimball, NE, EDA, (Clean 
                                     Harbors Inc.) (AMT), 10.75%, 
                                     9/1/26                             549,765

 NR          NR           1,000      New Jersey EDA, (Holt 
                                     Hauling), 7.90%, 3/1/27          1,142,860

 NR          NR             750      Ohio Solid Waste Revenue,
                                     (Republic Engineered Steels
                                     Inc.), (AMT), 9.00%, 6/1/21        808,665

 NR          BBB-         2,000      Pennsylvania Economic Devel-
                                     opment Financing Authority, 
                                     (Resources Recovery - Culver 
                                     Project), (AMT), 7.05%, 
                                     12/1/10                          2,227,220

 NR          NR             500      Robbins, IL, Resources 
                                     Recovery, (AMT), 8.375%, 
                                     10/15/10                           523,575

 NR          NR           1,330      Santa Fe, NM (Crow Hobbs),
                                     8.25%, 9/1/05                    1,391,193
- --------------------------------------------------------------------------------
                                                                  $  16,793,161
- --------------------------------------------------------------------------------

Insured-Colleges and Universities -- 0.2%
- --------------------------------------------------------------------------------
 Aaa         AAA        $   500      Southern Illinois 
                                     University, Housing and 
                                     Auxiliary Facilities,
                                     (MBIA), 0.00%, 4/1/17        $     186,100
- --------------------------------------------------------------------------------
                                                                  $     186,100
- --------------------------------------------------------------------------------

Insured-General Obligations -- 1.6%
- --------------------------------------------------------------------------------
 Aaa         AAA        $   500      Kalamazoo, MI, (MBIA),
                                     5.40%, 5/1/14                $     528,720

 Aaa         AAA          1,000      Willow Run, MI, Community 
                                     School District, (AMBAC), 
                                     5.00%, 5/1/16                      984,750
- --------------------------------------------------------------------------------
                                                                  $   1,513,470
- --------------------------------------------------------------------------------

                      See notes to financial statements

                                       14
<PAGE>
 
National Limited Maturity Municipals Portfolio as of March 31, 1998

PORTFOLIO OF INVESTMENTS CONT'D


Ratings (Unaudited)     Principal                                               
- --------------------    Amount
             Standard   (000's
Moody's      & Poor's   omitted)     Security                     Value
- --------------------------------------------------------------------------------

Insured-Housing -- 2.5%
- --------------------------------------------------------------------------------
 Aaa         AAA        $ 2,115      Massachusetts HFA, 
                                     (Harborpoint Development), 
                                     (AMBAC), (AMT),
                                     6.20%, 12/1/10               $   2,290,630
- --------------------------------------------------------------------------------
                                                                  $   2,290,630
- --------------------------------------------------------------------------------

Insured-Industrial Development Revenue -- 0.6%
- --------------------------------------------------------------------------------
 Aaa         AAA        $   260      Arkansas Development 
                                     Finance Authority, 
                                     (ADFA Guaranty Program), 
                                     (AMBAC), (AMT), 
                                     5.40%,  11/1/12              $    261,227
                                                                        
 Aaa         AAA            260      Arkansas Development 
                                     Finance Authority, 
                                     (AEDC Guaranty Program), 
                                     (AMBAC), (AMT), 
                                     5.40%, 11/1/12                    261,227
- --------------------------------------------------------------------------------
                                                                  $    522,454
- --------------------------------------------------------------------------------

Insured-Special Tax Revenue -- 0.6%
- --------------------------------------------------------------------------------
 Aaa         AAA        $   500      George L. Smith, 
                                     (Georgia World Congress 
                                     Center - Domed Stadium
                                     Project), (MBIA), (AMT),
                                     6.00%, 7/1/06/(3)/           $    527,020
- --------------------------------------------------------------------------------
                                                                  $    527,020
- --------------------------------------------------------------------------------

Insured-Transportation -- 1.1%
- --------------------------------------------------------------------------------
 Aaa         AAA        $ 1,000      Chicago, IL (O'Hare 
                                     International Airport), 
                                     (AMBAC), 5.50%, 1/1/16       $  1,020,660
- --------------------------------------------------------------------------------
                                                                  $  1,020,660
- --------------------------------------------------------------------------------

Lease Revenue/
Certificates of Participation -- 0.6%
- --------------------------------------------------------------------------------
 Baa3        NR         $   500      Mashantucket Western 
                                     Pequot Tribe, CT, 
                                     5.55%, 9/1/08                $    525,410
- --------------------------------------------------------------------------------
                                                                  $    525,410
- --------------------------------------------------------------------------------

Life Care -- 4.0%
- --------------------------------------------------------------------------------
 NR          NR         $ 1,065      Florence, KY, Housing 
                                     Facilities,
                                     (Bluegrass Housing),
                                     7.25%, 5/1/07                $  1,134,470

 NR          NR           2,000      Illinois Health Facilities
                                     Authority, (Lutheran Social
                                     Services), 6.125%, 8/15/10      2,090,160

 NR          NR             475      Vermont State Industrial
                                     Development Authority, 
                                     (Wake Robins),                     
                                     8.00%, 4/1/99                $    478,392
- --------------------------------------------------------------------------------
                                                                  $  3,703,022
- --------------------------------------------------------------------------------

Miscellaneous -- 0.6%
- --------------------------------------------------------------------------------
 NR          NR         $   600      Tax Revenue Exempt 
                                     Securities Trust, 
                                     Community Health Provider,
                                     (Pooled Loan Program Various
                                     States Trust Certificates),  
                                     6.00%, 12/1/36               $    605,010 
- --------------------------------------------------------------------------------
                                                                  $    605,010
- --------------------------------------------------------------------------------

Nursing Homes -- 11.7%
- --------------------------------------------------------------------------------
 NR          NR         $ 1,105      Arizona Health Facilities
                                     Authority Assisted Living
                                     Facilities, (Mesa), 
                                     7.625%, 1/1/06               $   1,141,399

 NR          A+           3,500      California Statewide 
                                     Communities Development 
                                     Corporation, (Pacific
                                     Homes), 5.90%, 4/1/09            3,724,559

 NR          NR             650      Citrus County, FL, 
                                     Industrial Development 
                                     Authority, (Beverly 
                                     Enterprises), 5.00%, 
                                     4/1/03/(3)/                        650,572

 NR          NR           1,000      Clovis, NM, Industrial
                                     Development Revenue, 
                                     (Retirement Ranches, Inc.), 
                                     7.75%, 4/1/19                    1,022,420

 NR          NR             850      Fairfield, OH, EDR, 
                                     (Beverly Enterprises), 
                                     8.50%, 1/1/03                      926,798

 NR          NR           1,500      Massachusetts Industrial 
                                     Finance Agency, Health Care 
                                     Facilities, (Age Institute 
                                     of Massachusetts),
                                     7.60%, 11/1/05                   1,605,300

 NR          NR           1,550      Saint Tammany Public Trust
                                     Finance Authority, LA
                                     (Christwood),                   
                                     8.75%, 11/15/05                  1,799,287
- --------------------------------------------------------------------------------
                                                                 $   10,870,335
- --------------------------------------------------------------------------------

Pooled Loans -- 4.6%
- --------------------------------------------------------------------------------
 Aa2         NR         $ 1,900      Arizona Educational Loan
                                     Marketing Corp., (AMT), 
                                     6.25%, 6/1/06               $    2,076,130

 A           NR           1,000      Arizona Student Loan 
                                     Acquisition Authority, 
                                     (AMT), 7.625%, 5/1/10            1,112,750

 A           NR           1,000      Arkansas State Student Loan
                                     Authority, (AMT), 6.25%, 
                                     6/1/10                           1,056,120
- --------------------------------------------------------------------------------
                                                                 $    4,245,000
- --------------------------------------------------------------------------------

                       See notes to financial statements

                                       15
<PAGE>
 
National Limited Maturity Municipals Portfolio as of March 31, 1998

PORTFOLIO OF INVESTMENTS CONT'D



Ratings (Unaudited)     Principal                                               
- --------------------    Amount
            Standard    (000's
Moody's     & Poor's    omitted)     Security                      Value
- ------------------------------------------------------------------------------- 

Transportation -- 6.7%
- ------------------------------------------------------------------------------- 

 Baa1        BBB        $ 2,000      Denver, CO City and County
                                     Airport, (AMT), 7.00%, 
                                     11/15/99                      $  2,094,760

 NR          NR           1,225      Eagle County, CO, Airport
                                     Terminal Corp. (American
                                     Airlines), (AMT), 6.75%, 
                                     5/1/06                           1,309,268

 NR          NR             900      Los Angeles, CA, Regional 
                                     Airport Improvement Corporate 
                                     Lease, (TransWorld Airlines),
                                     6.125%, 5/15/00                    900,117

 NR          NR             260      Memphis-Shelby County, TN 
                                     Airport Authority, 6.125%, 
                                     12/1/16                            266,578

 Baa2        BBB            500      Memphis-Shelby County, TN,
                                     (Federal Express Co.), 5.35%,              
                                     9/1/12                             512,115

 NR          NR           1,000      Northwest Arkansas Regional
                                     Airport Authority, (AMT), 
                                     7.625%, 2/1/27                   1,154,370
- --------------------------------------------------------------------------------
                                                                   $  6,237,208
- --------------------------------------------------------------------------------


Total Tax-Exempt Investments -- 100.0%
     (identified cost $87,240,993)                                 $ 92,890,181
- --------------------------------------------------------------------------------

The Portfolio invests primarily in debt securities issued by municipalities. The
ability of the issuers of the debt securities to meet their obligations may be
affected by economic developments in a specific industry or municipality. In
order to reduce the risk of such economic developments, at March 31, 1998, 8.5%
of the securities in the portfolio of investments are backed by bond insurance
of various financial institutions and financial guaranty assurance agencies. The
aggregate percentage insured by financial institutions ranged from 3.3% to 5.2%
of total investments.

At March 31, 1998, the concentration of the Portfolio's investments in the
various states, determined as a percentage of total investments is as follows:


     Arizona                                                10%
     Michigan                                               10%
     Others, representing less than 10% individually        80%



AMT - Interest earned from these securities may be considered a tax preference
item for purposes of the Federal Alternative Minimum Tax.



/(1)/  Security (or a portion thereof) has been segregated to cover margin
       requirements on open financial futures contracts.

/(2)/  Security has been segregated to cover when-issued securities.


/(3)/  When-issued security.

                       See notes to financial statements

                                       16
<PAGE>

National Limited Maturity Municipals Portfolio as of March 31, 1998

FINANCIAL STATEMENTS

Statement of Assets and Liabilities                 

As of March 31, 1998

Assets
<TABLE> 
- --------------------------------------------------------------------------------
<S>                                                             <C> 
Investments, at value (Note 1A)
     (identified cost, $87,240,993)                             $   92,890,181
Cash                                                                       459
Receivable for investments sold                                         20,000
Interest receivable                                                  1,720,255
Deferred organization expenses (Note 1D)                                   219
- --------------------------------------------------------------------------------
Total assets                                                    $   94,631,114
- --------------------------------------------------------------------------------


Liabilities
- --------------------------------------------------------------------------------
Payable for when-issued securities (Note 1G)                    $    1,173,564
Demand note payable (Note 3)                                           297,000
Payable for daily variation margin on open                
     financial futures contracts (Notes 1E and 6)                       21,562
Payable to affiliate for Trustees' fees (Note 2)                         1,945
Accrued expenses                                                         9,783
- --------------------------------------------------------------------------------
Total liabilities                                               $    1,503,854
- --------------------------------------------------------------------------------
Net Assets applicable to investors' interest in Portfolio       $   93,127,260
- --------------------------------------------------------------------------------


Sources of Net Assets
- --------------------------------------------------------------------------------
Net proceeds from capital contributions and withdrawals         $   87,497,879
Net unrealized appreciation of investments (computed on 
     the basis of identified cost)                                   5,629,381
- --------------------------------------------------------------------------------
Total                                                           $   93,127,260
- --------------------------------------------------------------------------------
</TABLE> 

Statement of Operations

For the Year Ended
March 31, 1998
Investment Income (Note 1B)
<TABLE> 
- --------------------------------------------------------------------------------
<S>                                                             <C> 
Interest income                                                 $    5,904,500
- --------------------------------------------------------------------------------
Total investment income                                         $    5,904,500
- --------------------------------------------------------------------------------


Expenses
- --------------------------------------------------------------------------------
Investment adviser fee (Note 2)                                 $      466,594
Compensation of Trustees not members of the                
     Investment Adviser's organization (Note 2)                          7,331
Custodian fee (Note 1H)                                                 57,976
Legal and accounting services                                           21,214
Amortization of organization expenses (Note 1D)                          2,468
Miscellaneous                                                           27,479
- --------------------------------------------------------------------------------
Total expenses                                                  $      583,062
- --------------------------------------------------------------------------------
Deduct --
     Reduction of custodian fee (Note 1H)                       $       12,223
- --------------------------------------------------------------------------------
Total expense reductions                                        $       12,223
- --------------------------------------------------------------------------------


Net expenses                                                    $      570,839
- --------------------------------------------------------------------------------


Net investment income                                           $    5,333,661
- --------------------------------------------------------------------------------


Realized and Unrealized
Gain (Loss) on Investments
- --------------------------------------------------------------------------------
Net realized gain (loss) --
     Investment transactions (identified cost basis)            $    1,034,776
     Financial futures contracts                                    (1,196,652)
- --------------------------------------------------------------------------------
Net realized loss on investment transactions                    $     (161,876)
- --------------------------------------------------------------------------------
Change in unrealized appreciation (depreciation) --
     Investments (identified cost basis)                        $    4,827,994
     Financial futures contracts                                      (158,570)
- --------------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation) of         $    4,669,424
     investments
- --------------------------------------------------------------------------------


Net realized and unrealized gain on investments                 $    4,507,548
- --------------------------------------------------------------------------------


Net increase in net assets from operations                      $    9,841,209
- --------------------------------------------------------------------------------
</TABLE> 
                       See notes to financial statements

                                      17
<PAGE>
National Limited Maturity Municipals Portfolio as of March 31, 1998
FINANCIAL STATEMENTS CONT'D

Statements of Changes in Net Assets



Increase (Decrease)                    Year Ended            Year Ended
in Net Assets                          March 31, 1998        March 31, 1997
- -------------------------------------------------------------------------------
From operations --
     Net investment income               $     5,333,661       $     6,518,710
     Net realized loss on
         investment transactions                (161,876)           (1,129,741)
     Net change in unrealized
         appreciation (depreciation)
         of investments                        4,669,424              (150,139)
- -------------------------------------------------------------------------------

Net increase in net assets
     from operations                     $     9,841,209       $     5,238,830
- -------------------------------------------------------------------------------

Capital transactions --
     Contributions                       $    44,850,231       $     8,914,088
     Withdrawals                             (64,067,696)          (46,425,770)
- -------------------------------------------------------------------------------

Net decrease in net assets from
     capital transactions                $   (19,217,465)      $   (37,511,682)
- -------------------------------------------------------------------------------


Net decrease in net assets               $    (9,376,256)      $   (32,272,852)
- -------------------------------------------------------------------------------

Net Assets
- -------------------------------------------------------------------------------
At beginning of year                     $   102,503,516       $   134,776,368
- -------------------------------------------------------------------------------
At end of year                           $    93,127,260       $   102,503,516
- -------------------------------------------------------------------------------

                       See notes to financial statements
                                      18
<PAGE>

National Limited Maturity Municipals Portfolio as of March 31, 1998

FINANCIAL STATEMENTS CONT'D

Supplementary Data

<TABLE> 
<CAPTION> 
                                                                                Year Ended March 31,
                                                   -------------------------------------------------------------------------------
                                                    1998              1997             1996             1995           1994*
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>            <C>              <C>              <C>            <C>    

Ratios to average daily net assets
- ----------------------------------------------------------------------------------------------------------------------------------
Expenses/(1)/                                           0.60%           0.60%            0.57%            0.53%          0.52%+
Expenses after custodian fee reduction                  0.59%           0.58%            0.56%             --             --
Net investment income                                   5.53%           5.45%            5.08%            5.02%          4.74%+
Portfolio Turnover                                        41%             68%              68%              56%            21%
- ----------------------------------------------------------------------------------------------------------------------------------
Net assets, end of year (000's omitted)            $  93,127      $  102,504       $  134,776       $  169,621     $  177,842
- ----------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

+    Annualized.
*    For the period from the start of business, May 3, 1993, to March 31, 1994.
(1)  The expense ratios for the year ended March 31, 1996 and periods thereafter
     have been adjusted to reflect a change in reporting requirements. The new
     reporting guidelines require the Portfolio to increase its expense ratios
     by the effect of any expense offset arrangements with its service
     providers. The expense ratios for each of the prior periods have not been
     adjusted to reflect this change.


                       See notes to financial statements

                                      19
<PAGE>
 
National Limited Maturity Municipals Portfolio as of March 31, 1998 

NOTES TO FINANCIAL STATEMENTS


1  Significant Accounting Policies
   -----------------------------------------------------------------------------
   National Limited Maturity Municipals Portfolio (the Portfolio) seeks to
   provide (1) a high level of income exempt from regular federal income tax and
   (2) limited principal fluctuation. The Portfolio is registered under the
   Investment Company Act of 1940 as a diversified open-end management
   investment company which was organized as a trust under the laws of the State
   of New York on May 1, 1992. The Declaration of Trust permits the Trustees to
   issue interests in the Portfolio. The following is a summary of significant
   accounting policies of the Portfolio. The policies are in conformity with
   generally accepted accounting principles.

   A Investment Valuation -- Municipal bonds are normally valued on the basis of
   valuations furnished by a pricing service. Taxable obligations, if any, for
   which price quotations are readily available are normally valued at the mean
   between the latest bid and asked prices. Futures contracts listed on the
   commodity exchanges are valued at closing settlement prices. Short-term
   obligations, maturing in sixty days or less, are valued at amortized cost,
   which approximates value. Investments for which valuations or market
   quotations are unavailable are valued at fair value using methods determined
   in good faith by or at the direction of the Trustees.

   B Income -- Interest income is determined on the basis of interest accrued,
   adjusted for amortization of premium or discount when required for federal
   income tax purposes.

   C Income Taxes -- The Portfolio is treated as a partnership for federal tax
   purposes. No provision is made by the Portfolio for federal or state taxes on
   any taxable income of the Portfolio because each investor in the Portfolio is
   ultimately responsible for the payment of any taxes. Since some of the
   Portfolio's investors are regulated investment companies that invest all or
   substantially all of their assets in the Portfolio, the Portfolio normally
   must satisfy the applicable source of income and diversification requirements
   (under the Internal Revenue Code) in order for its investors to satisfy them.
   The Portfolio will allocate at least annually among its investors each
   investor's distributive share of the Portfolio's net taxable (if any) and 
   tax-exempt investment income, net realized capital gains, and any other items
   of income, gain, loss, deduction or credit. Interest income received by the
   Portfolio on investments in municipal bonds, which is excludable from gross
   income under the Internal Revenue Code, will retain its status as income
   exempt from federal income tax when allocated to the Portfolio's investors.
   The portion of such interest, if any, earned on private activity bonds issued
   after August 7, 1986 may be considered a tax preference item for investors.

   D Deferred Organization Expenses -- Costs incurred by the Portfolio in
   connection with its organization are being amortized on the straight-line
   basis over five years.

   E Financial Futures Contracts -- Upon the entering of a financial futures
   contract, the Portfolio is required to deposit ("initial margin") either in
   cash or securities an amount equal to a certain percentage of the purchase
   price indicated in the financial futures contract. Subsequent payments are
   made or received by the Portfolio ("margin maintenance") each day, dependent
   on the daily fluctuations in the value of the underlying security, and are
   recorded for book purposes as unrealized gains or losses by the Portfolio.
   The Portfolio's investment in financial futures contracts is designed only to
   hedge against anticipated future changes in interest rates. Should interest
   rates move unexpectedly, the Portfolio may not achieve the anticipated
   benefits of the financial futures contracts and may realize a loss.

   F Options on Financial Futures Contracts -- Upon the purchase of a put option
   on a financial futures contract by the Portfolio, the premium paid is
   recorded as an investment, the value of which is marked-to-market daily. When
   a purchased option expires, a Portfolio will realize a loss in the amount of
   the cost of the option. When a Portfolio enters into a closing sales
   transaction, the Portfolio will realize a gain or loss depending on whether
   the sales proceeds from the closing sales transaction is greater or less than
   the cost of the option. When the Portfolio exercises a put option, settlement
   is made in cash. The risk associated with purchasing options is limited to
   the premium originally paid.

   G When-issued and Delayed Delivery Transactions -- The Portfolio may engage
   in when-issued and delayed delivery transactions. The Portfolio records
   when-issued securities on trade date and maintains security positions such
   that sufficient liquid assets will be available to make payments for the
   securities purchased. Securities purchased on a when-issued or delayed
   delivery basis are marked-to-market daily and begin earning interest on
   settlement date.

                                       20
<PAGE>
 
National Limited Maturity Municipals Portfolio as of March 31, 1998 

NOTES TO FINANCIAL STATEMENTS CONT'D


   H Expense Reduction -- Investors Bank & Trust Company (IBT) serves as
   custodian of the Portfolio. Pursuant to the custodian agreement, IBT receives
   a fee reduced by credits which are determined based on the average daily cash
   balances the Portfolio maintains with IBT. All significant credit balances
   used to reduce the Portfolio's custodian fees are reported as a reduction of
   operating expenses on the Statement of Operations.

   I Use of Estimates -- The preparation of the financial statements in
   conformity with generally accepted accounting principles requires management
   to make estimates and assumptions that affect the reported amounts of assets
   and liabilities at the date of the financial statements and the reported
   amounts of revenue and expense during the reporting period. Actual results
   could differ from those estimates.

   J Other -- Investment transactions are accounted for on a trade date basis.


2  Investment Adviser Fee and Other Transactions with Affiliates
   -----------------------------------------------------------------------------
   The investment adviser fee is earned by Boston Management and Research (BMR),
   a wholly-owned subsidiary of Eaton Vance Management (EVM), as compensation
   for management and investment advisory services rendered to the Portfolio.
   The fee is based upon a percentage of average daily net assets plus a
   percentage of gross income (i.e., income other than gains from the sale of
   securities). For the year ended March 31, 1998, the fee was equivalent to
   0.48% of the Portfolio's average net assets for such period and amounted to
   $466,594. Except as to Trustees of the Portfolio who are not members of EVM's
   or BMR's organization, officers and Trustees receive remuneration for their
   services to the Portfolio out of such investment adviser fee. Certain of the
   officers and Trustees of the Portfolio are officers and directors/trustees of
   the above organizations. Trustees of the Portfolio that are not affiliated
   with the Investment Adviser may elect to defer receipt of all or a percentage
   of their annual fees in accordance with the terms of the Trustees Deferred
   Compensation Plan. For the year ended March 31, 1998, no significant amounts
   have been deferred.


3  Line of Credit
   -----------------------------------------------------------------------------
   The Portfolio participates with other portfolios and funds managed by BMR and
   EVM and its affiliates in a $100 million unsecured line of credit agreement
   with a group of banks. The Portfolio may temporarily borrow from the line of
   credit to satisfy redemption requests or settle investment transactions.
   Interest is charged to each portfolio or fund based on its borrowings at an
   amount above either the Eurodollar rate or federal funds rate. In addition, a
   fee computed at an annual rate of 0.10% on the daily unused portion of the
   line of credit is allocated among the participating portfolios and funds at
   the end of each quarter. The Portfolio did not have any significant
   borrowings or allocated fees during the period.


4  Investments
   -----------------------------------------------------------------------------
   Purchases and sales of investments, other than U.S. Government securities and
   short-term obligations, aggregated $39,870,169 and $55,540,077, respectively,
   for the year ended March 31, 1998.


5  Federal Income Tax Basis of Investments
   -----------------------------------------------------------------------------
   The cost and unrealized appreciation/depreciation in value of the investments
   owned at March 31, 1998, as computed on a federal income tax basis, were as
   follows:

     Aggregate cost                                            $   87,240,993
     ---------------------------------------------------------------------------
     Gross unrealized appreciation                             $    5,673,416
     ---------------------------------------------------------------------------
     Gross unrealized depreciation                                    (24,228)
     ---------------------------------------------------------------------------
     Net unrealized appreciation                               $    5,649,188
     ---------------------------------------------------------------------------


6  Financial Instruments
   -----------------------------------------------------------------------------
   The Portfolio regularly trades in financial instruments with off-balance
   sheet risk in the normal course of its investing activities to assist in
   managing exposure to various market risks. These financial instruments
   include written options and futures contracts and may involve, to a varying
   degree, elements of risk in excess of the amounts recognized for financial
   statement purposes. The notional or contractual amounts of these instruments
   represent the investment the Portfolio has in particular classes of financial
   instruments and does not necessarily represent the amounts potentially
   subject to risk. The measurement of the risks associated with these
   instruments is meaningful only when all related and offsetting transactions
   are considered. A summary of obligations under these financial instruments at
   March 31, 1998 were as follows:


      Futures
      Contracts                                              Net
      Expiration                                          Unrealized
      Date         Contracts                  Position   Appreciation
      ---------------------------------------------------------------
      6/98         46 U.S. Treasury Bonds      Short     $   19,807
      ---------------------------------------------------------------

                                       21
<PAGE>

National Limited Maturity Municipals Portfolio as of March 31, 1998

INDEPENDENT AUDITORS' REPORT


To the Trustees and Investors of 
National Limited Maturity Municipals Portfolio:
- -------------------------------------------------------------------------------
We have audited the accompanying statement of assets and liabilities, including
the portfolio of investments, of National Limited Maturity Municipals Portfolio
as of March 31, 1998, the related statement of operations for the year then
ended, the statements of changes in net assets for the years ended March 31,
1998 and 1997 and the supplementary data for each of the years in the four-year
period ended March 31, 1998 and for the period from the start of business, May
3, 1993, to March 31, 1994. These financial statements and supplementary data
are the responsibility of the Trust's management. Our responsibility is to
express an opinion on these financial statements and supplementary data based on
our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements and supplementary
data are free of material misstatement. An audit includes examining, on a test
basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities held as of March
31, 1998 by correspondence with the custodian and brokers; where replies were
not received, alternative procedures were performed. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion. 

In our opinion, such financial statements and supplementary data present fairly,
in all material respects, the financial position of National Limited Maturity
Municipals Portfolio at March 31, 1998, the results of its operations, the
changes in its net assets and its supplementary data for the respective stated
periods in conformity with generally accepted accounting principles.

                                       DELOITTE & TOUCHE LLP
                                       Boston, Massachusetts
                                       May 1, 1998

                                      22
<PAGE>

EV Marathon National Limited Maturity Municipals Fund as of March 31, 1998

INVESTMENT MANAGEMENT


EV Marathon National Limited Maturity Municipals Fund

Officers

Thomas J. Fetter
President

James B. Hawkes
Vice President and Trustee

Robert B. MacIntosh
Vice President

James L. O'Connor
Treasurer

Alan R. Dynner
Secretary


Independent Trustees

Donald R. Dwight
President, Dwight Partners, Inc.

Samuel L. Hayes, III
Jacob H. Schiff Professor of Investment
Banking, Harvard University Graduate School of Business Administration

Norton H. Reamer
President and Director, United Asset
Management Corporation

John L. Thorndike
Formerly Director, Fiduciary Company Incorporated

Jack L. Treynor
Investment Adviser and Consultant


National Limited Maturity Municipals Portfolio

Officers

Thomas J. Fetter
President

James B. Hawkes
Vice President and Trustee

William H. Ahern, Jr.
Vice President and
Portfolio Manager

Robert B. MacIntosh
Vice President

James L. O'Connor
Treasurer

Alan R. Dynner
Secretary


Independent Trustees

Donald R. Dwight
President, Dwight Partners, Inc.

Samuel L. Hayes, III
Jacob H. Schiff Professor of Investment
Banking, Harvard University Graduate School of Business Administration

Norton H. Reamer
President and Director, United Asset
Management Corporation

John L. Thorndike
Formerly Director, Fiduciary Company Incorporated

Jack L. Treynor
Investment Adviser and Consultant

                                      23
<PAGE>
 
Investment Advisor of
National Limited Maturity Municipals Portfolio
Boston Management and Research
24 Federal Street
Boston, MA 02110

Administrator of
EV Marathon National Limited Maturity Municipals Fund
Eaton Vance Management
24 Federal Street
Boston, MA 02110

Principal Underwriter
Eaton Vance Distributors, Inc.
24 Federal Street
Boston, MA 02110
(617)482-8260

Custodian
Investors Bank & Trust Company
200 Clarendon Street
Boston, MA 02116

Transfer Agent
First Data Investor Services Group, Inc.
Attention:  Eaton Vance Funds
P.O. Box 5123
Westborough, MA 01581-5123

Auditors
Deloitte & Touche LLP
125 Summer Street
Boston, MA 02110



EV Marathon National Limited                        
Maturity Municipals Fund
24 Federal Street
Boston, MA 02110


- --------------------------------------------------------------------------------
This report must be preceded or accompanied by a current prospectus which
contains more complete information on the Fund, including its distribution plan,
sales charges and expenses. Please read the prospectus carefully before you
invest or send money.
- --------------------------------------------------------------------------------
                                                                  M-LNASRC-5/98


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