EATON VANCE INVESTMENT TRUST
N-30D, 1998-12-09
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<PAGE>
 
[EATON VANCE LOGO]

Mutual Funds                        [PHOTO OF STONE WALL WITH "EDUCATION" SIGN]
for People
Who Pay 
Taxes


Semiannual Report September 30, 1998




[PHOTO OF NIGHT TIME TRAFFIC ON EXPRESSWAY]


                                  EATON VANCE
                                   NATIONAL 
                               LIMITED MATURITY
                                MUNICIPALS FUND


[PHOTO OF SUSPENSION BRIDGE]
<PAGE>
 
Eaton Vance National Limited Maturity Municipals Fund as of September 30, 1998

LETTER TO SHAREHOLDERS


[PHOTO OF          Investment Environment
W. AHERN]          ------------------------------------------------------------
                   The Economy

                   .   In response to a weak Asian economy, the U.S. economy
                       lost some momentum in 1998. Gross domestic product growth
                       slowed to 1.8% in the second quarter before rebounding
William H. Ahern,      somewhat to 3.3% in the third quarter. Unemployment,
Portfolio Manager      which had fallen to a 24-year low of 4.3% in July, edged
                       up to 4.6% by September.

 .   With inflation under control and signs of a slowing economy, the Federal
    Reserve elected to ease monetary policy. By late October, the Fed had
    lowered its Federal Funds target rate - a key short-term interest rate
    barometer - to 5.0%.

 .   The municipal market lagged the Treasury market throughout the year. In a
    period of economic uncertainty and market chaos abroad, Treasuries
    outperformed as investors sought the refuge of quality.


The Fund
- --------------------------------------------------------------------------------
 .   During the six months ended September 30, 1998, the Fund's Class A, Class B,
    and Class C shares had total returns of 3.0%, 2.8%, and 2.8%, 
    respectively./1/ For Class A and Class B, this return resulted from a rise
    in net asset value (NAV) per share to $10.66 on September 30, 1998 from
    $10.58 on March 31, 1998, and the reinvestment of $0.232 and $0.212 per
    share, respectively, in tax-free income./2/ And for Class C, from a rise in
    NAV to $9.98 from $9.92, and the reinvestment of $0.209 per share in tax-
    free income./2/

 .   Based on the Fund's most recent dividends and NAVs on September 30, 1998 of
    $10.66 per share for Class A and Class B, and $9.98 for Class C, the Fund's
    distribution rates were 4.74%, 3.98%, and 3.98%, respectively./3/

 .   The SEC 30-day yields for Class A, B and C shares at September 30 were
    4.12%, 3.50%, and 3.33%, respectively./4/


Management Update
- --------------------------------------------------------------------------------
 .   Industrial development bonds constituted the Portolio's largest sector
    weighting. These bonds support projects for a wide range of companies,
    including paper manufacturers, steelmakers, power suppliers, and
    transportation companies.

 .   Management pursued a barbell approach, balancing higher quality bonds for
    liquidity and performance with non-rated bonds that provided attractive
    yields.

 .   Nursing homes and life care facilities represented good opportunities among
    non-rated bonds. In addition to providing attractive tax-free income, these
    issues finance facilities that address the growing needs of our older
    citizens.


Your Investment at Work
- --------------------------------------------------------------------------------

    Eastern Connecticut
    Resource Recovery Authority
    Wheelabrator Lisbon

 .   These bonds were issued in 1993 to finance the design and construction of a
    500-ton-per-day solid waste disposal project in Lisbon to be operated by a
    subsidiary of Wheelabrator Technologies, Inc.

 .   The energy that is produced by the processing of waste at the facility but
    not consumed by the operation is sold to Connecticut Light and Power.

 .   The bonds have a coupon of 5.50%. They are a good example of the Portfolio's
    efforts to find value in the non-rated and lower-investment-grade segment of
    the market.
- --------------------------------------------------------------------------------
/1/ These returns do not include the 2.25% maximum sales charge for Class A
    shares or the applicable contingent deferred sales charges (CDSC) for Class
    B and C shares. /2/ A portion of the Fund's income could be subject to
    federal income tax and/or alternative minimum tax and state income tax. 
    /3/ The Fund's distribution rate represents actual distributions paid to
    shareholders and is calculated by dividing the last distribution per share
    (annualized) by the net asset value. /4/ The Fund's SEC yield is calculated
    by dividing the net investment income per share for the 30-day period by the
    offering price at the end of the period and annualizing the result. 
    /5/ Returns are historical and are calculated by determining the percentage
    change in net asset value (NAV) with all distributions reinvested. SEC
    returns for Class A reflect the maximum 2.25% sales charge. SEC returns for
    Class B reflect applicable CDSC based on the following schedule: 3% - 1st
    year; 2.5% - 2nd year; 2% - 3rd year; 1% - 4th year. SEC 1-Year return for
    Class C reflects 1% CDSC. /6/ Sector weightings and Portfolio Overview are
    as of 9/30/98 only and may not be representative of the Portfolio's current
    or future investments.

    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.



- --------------------------------------------------------------------------------
Fund Information
as of September 30, 1998

<TABLE>
<CAPTION>
Performance/5/                                      Class A   Class B   Class C
- -------------------------------------------------------------------------------
<S>                                                 <C>       <C>       <C>
Average Annual Total Returns (at net asset value)
- -------------------------------------------------------------------------------
One Year                                              8.2%      7.4%      7.0%
Five Years                                            N.A.      4.3       N.A.
Life of Fund/+/                                       5.8       5.6       4.1
</TABLE> 

<TABLE> 
<CAPTION> 
SEC Average Annual Total Returns (including sales charge or applicable CDSC)
- -------------------------------------------------------------------------------
<S>                                                 <C>       <C>       <C>
One Year                                              5.7%      4.4%      6.0%
Five Years                                            N.A.      4.3       N.A.
Life of Fund/+/                                       5.5       5.6       4.1
</TABLE> 
/+/Inception Dates - Class A: 6/27/96; Class B: 5/22/92; Class C:12/8/93

<TABLE>
<CAPTION>
5 Largest Sectors/6/                      Portfolio Overview/6/
- --------------------------------------    --------------------------------------
<S>                            <C>        <S>                     <C> 
By total investments                                            
                                          Number of Issues              77
Industrial Development Revenue 18.4%                            
                                          Duration                5.8 Yrs.
Escrowed/Prerefunded           14.4%                                 
                                          Effective Maturity      7.9 Yrs.
General Obligations            12.0%                                      
                                          Average Rating               BBB
Nursing Home                   10.0%                                           
                                          Average Call            7.3 Yrs.
Hospital                        6.9%      
                                          Average Dollar Price     $105.25
</TABLE> 

- -------------------------------------------------------------------------------
 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.
- ------------------------------------------------------------------------------- 

                                       2
<PAGE>
 
Eaton Vance National Limited Maturity Municipals Fund as of September 30, 1998
FINANCIAL STATEMENTS (Unaudited)
Statement of Assets and Liabilities                       

<TABLE>
<CAPTION>
As of September 30, 1998
Assets
- --------------------------------------------------------------------------------
<S>                                                                 <C>
Investment in National Limited Maturity Municipals
   Portfolio, at value (identified cost, $86,249,130)               $92,544,630

Receivable for Fund shares sold                                          10,095

Other assets                                                             22,400

Deferred organization expenses                                            5,288
- --------------------------------------------------------------------------------
Total assets                                                        $92,582,413
- --------------------------------------------------------------------------------


Liabilities
- --------------------------------------------------------------------------------
Payable for Fund shares redeemed                                    $   309,677

Dividends payable                                                       165,535

Other accrued expenses                                                   43,438
- --------------------------------------------------------------------------------
Total liabilities                                                   $   518,650
- --------------------------------------------------------------------------------
Net Assets                                                          $92,063,763
- --------------------------------------------------------------------------------


Sources of Net Assets
- --------------------------------------------------------------------------------
Paid-in capital                                                     $89,998,957

Accumulated undistributed net realized loss from Portfolio
   (computed on the basis of identified cost)                        (4,439,824)

Accumulated undistributed net investment income                         209,130

Net unrealized appreciation from Portfolio (computed on the
   basis of identified cost)                                          6,295,500
- --------------------------------------------------------------------------------
Total                                                               $92,063,763
- --------------------------------------------------------------------------------


Class A Shares
- --------------------------------------------------------------------------------
Net Assets                                                          $74,767,464

Shares Outstanding                                                    7,010,602

Net Asset Value and Redemption Price Per Share
   (net assets / shares of beneficial interest outstanding)         $     10.66

Maximum Offering Price Per Share
   (100 / 97.75 of $10.66)                                          $     10.91
- --------------------------------------------------------------------------------


Class B Shares
- --------------------------------------------------------------------------------
Net Assets                                                          $ 6,486,278

Shares Outstanding                                                      608,754

Net Asset Value, Offering and Redemption Price Per Share
   (net assets / shares of beneficial interest outstanding)         $     10.66
- --------------------------------------------------------------------------------


Class C Shares
- --------------------------------------------------------------------------------
Net Assets                                                          $10,810,021

Shares Outstanding                                                    1,082,901

Net Asset Value, Offering and Redemption Price Per Share
   (net assets  /  shares of beneficial interest
   outstanding)                                                     $      9.98
- --------------------------------------------------------------------------------

On sales of $100,000 or more, the offering price of Class A
   shares is reduced.


Statement of Operations

For the Six Months Ended
September 30, 1998

Investment Income
- --------------------------------------------------------------------------------
Interest allocated from Portfolio                                   $ 2,707,045

Expenses allocated from Portfolio                                      (279,705)
- --------------------------------------------------------------------------------
Net investment income from Portfolio                                $ 2,427,340
- --------------------------------------------------------------------------------


Expenses
- --------------------------------------------------------------------------------
Trustees fees and expenses                                          $       940

Distribution and service fees

   Class A                                                               48,379

   Class B                                                               38,971

   Class C                                                               40,105

Transfer and dividend disbursing agent fees                              43,105

Registration fees                                                        24,859

Printing and postage                                                     15,113

Amortization of organization expenses                                     7,585

Custodian fee                                                             5,418

Legal and accounting services                                             1,968

Miscellaneous                                                             6,353
- --------------------------------------------------------------------------------
Total expenses                                                      $   232,796
- --------------------------------------------------------------------------------

Net investment income                                               $ 2,194,544
- --------------------------------------------------------------------------------


Realized and Unrealized
Gain (Loss) from Portfolio
- --------------------------------------------------------------------------------
Net realized gain (loss) --

   Investment transactions (identified cost basis)                  $   231,482

   Financial futures contracts                                         (244,201)
- --------------------------------------------------------------------------------
Net realized loss                                                   $   (12,719)
- --------------------------------------------------------------------------------
Change in unrealized appreciation (depreciation) --

   Investments                                                      $   694,952

   Financial futures contracts                                          (28,833)
- --------------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation)                $   666,119
- --------------------------------------------------------------------------------

Net realized and unrealized gain                                    $   653,400
- --------------------------------------------------------------------------------

Net increase in net assets from operations                          $ 2,847,944
- --------------------------------------------------------------------------------
</TABLE>

                       See notes to financial statements

                                       3

<PAGE>
 
Eaton Vance National Limited Maturity Municipals Fund as of September 30, 1998

FINANCIAL STATEMENTS CONT'D

Statements of Changes in Net Assets

<TABLE>
<CAPTION>

                                         Six Months Ended
Increase (Decrease)                      September 30, 1998      Year Ended
in Net Assets                            (Unaudited)             March 31, 1998
- -------------------------------------------------------------------------------
<S>                                      <C>                     <C>
From operations--
  Net investment income                         $ 2,194,544        $  3,838,067
  Net realized loss                                 (12,719)           (124,047)
  Net change in unrealized
    appreciation (depreciation)                     666,119           3,832,336
- --------------------------------------------------------------------------------
Net increase in net assets
  from operations                               $ 2,847,944        $  7,546,356
- --------------------------------------------------------------------------------
Distributions to shareholders--
  From net investment income
    Class A                                     $(1,764,801)       $ (2,409,865)
    Class B                                        (182,220)         (1,219,304)
    Class C                                        (182,299)                 --
  In excess of net investment income                                  
    Class C                                            (349)                 --
- --------------------------------------------------------------------------------
Total distributions to shareholders             $(2,129,669)       $ (3,629,169)
- --------------------------------------------------------------------------------
Transactions in shares of
  beneficial interest--
  Proceeds from sale of shares
    Class A                                     $ 3,201,299        $         --
    Class B                                         844,434           2,211,837
    Class C                                       6,725,461                  --
  Issued in reorganization of
    EV Traditional and Classic
    National Limited Maturity
    Municipals Funds
    Class A                                      12,949,960                  --
    Class C                                       7,722,266                  --
  Net asset value of shares issued to
    shareholders in payment of
    distributions declared
    Class A                                         545,644             894,751
    Class B                                         111,469             671,538
    Class C                                         122,906                  --
  Cost of shares redeemed
    Class A                                      (6,982,686)        (15,646,244)
    Class B                                      (1,587,764)         (6,283,507)
    Class C                                      (3,836,949)                 --
  Net asset value of shares exchanged
    Class A                                       4,465,867          35,328,625
    Class B                                      (4,465,867)        (35,328,625)
- --------------------------------------------------------------------------------
Net increase (decrease) in net assets
  from Fund share transactions                  $19,816,040        $(18,151,625)
- --------------------------------------------------------------------------------

Net increase (decrease)
   in net assets                                $20,534,315        $(14,234,438)
- --------------------------------------------------------------------------------
At beginning of period                          $71,529,448        $ 85,763,886
- --------------------------------------------------------------------------------
At end of period                                $92,063,763        $ 71,529,448
- --------------------------------------------------------------------------------

Accumulated
undistributed net
investment income
included in net assets
- --------------------------------------------------------------------------------
At end of period                                $   209,130        $    144,255
- --------------------------------------------------------------------------------
</TABLE>

                       See notes to financial statements

                                       4

<PAGE>
 
Eaton Vance National Limited Maturity Municipals Fund  as of September 30, 1998
FINANCIAL STATEMENTS CONT'D
Financial Highlights

<TABLE>
<CAPTION>

                                 Six Months Ended                                     Year Ended March 31,                        
                                 September 30, 1998           --------------------------------------------------------------------
                                 (Unaudited)                        1998                  1997          1996     1995     1994
                                ---------------------------   --------------------------------------------------------------------
                                Class A   Class B   Class C   Class A  Class B   Class A(2)   Class B  Class B   Class B   Class B
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>       <C>       <C>       <C>      <C>       <C>          <C>      <C>       <C>       <C>
Net asset value--Beginning of
  period                        $10.580   $10.580   $ 9.920   $10.070  $10.070     $10.030    $10.170  $ 10.130  $ 10.160  $ 10.450
- ------------------------------------------------------------------------------------------------------------------------------------

Income from operations
- ------------------------------------------------------------------------------------------------------------------------------------
Net investment income           $ 0.263(1)$ 0.224(1)$ 0.204(1)$ 0.527  $ 0.454(1)  $ 0.393    $ 0.428  $  0.413  $  0.400  $  0.406
Net realized and unrealized
  gain (loss)                     0.070     0.068     0.065     0.488    0.488       0.033(3)  (0.098)    0.040     0.033    (0.178)
- ------------------------------------------------------------------------------------------------------------------------------------
Total income from operations    $ 0.333   $ 0.292   $ 0.269   $ 1.015  $ 0.942     $ 0.426    $ 0.330  $  0.453  $  0.433  $  0.228
- ------------------------------------------------------------------------------------------------------------------------------------

Less distributions
- ------------------------------------------------------------------------------------------------------------------------------------
From net investment income      $(0.253)  $(0.212)  $(0.209)  $(0.505) $(0.432)    $(0.386)   $(0.430) $ (0.413) $ (0.400) $ (0.406)
In excess of net investment
   income                            --        --        --(4)     --       --          --         --        --    (0.058)   (0.091)
From net realized gain               --        --        --        --       --          --         --        --    (0.005)   (0.021)
- ------------------------------------------------------------------------------------------------------------------------------------
Total distributions             $(0.253)  $(0.212)  $(0.209)  $(0.505) $(0.432)    $(0.386)   $(0.430) $ (0.413) $ (0.463) $ (0.518)
- ------------------------------------------------------------------------------------------------------------------------------------

Net asset value--End of period  $10.660   $10.660   $ 9.980   $10.580  $10.580     $10.070    $10.070  $ 10.170  $ 10.130  $ 10.160
- ------------------------------------------------------------------------------------------------------------------------------------

Total Return (5)                   2.99%     2.80%     2.75%    10.50%    9.52%       4.06%      3.30%     4.51%     4.43%     2.10%
- ------------------------------------------------------------------------------------------------------------------------------------

Ratios/Supplemental Data
- ------------------------------------------------------------------------------------------------------------------------------------
Net assets, end of period
  (000's omitted)               $74,767   $ 6,486   $10,810   $59,992  $11,538     $37,072    $48,692  $112,027  $141,289  $151,787
Ratios (As a percentage of 
  average daily net assets):
  Expenses (6)(7)                  0.99%(8)  1.74%(8)  1.77%(8)  0.99%    1.73%       0.99%(8)   1.69%     1.64%     1.57%     1.46%
  Expenses after custodian fee
    reduction (6)                  0.98%(8)  1.73%(8)  1.76%(8)  0.98%    1.72%       0.97%(8)   1.67%     1.63%       --        --
  Net investment income            4.96%(8)  4.23%(8)  4.09%(8)  5.16%    4.42%       5.14%(8)   4.37%     4.04%     3.99%     3.78%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Net investment income per share was computed using average shares
    outstanding.
(2) For the period from the start of business, June 27, 1996, to March 31, 1997.
(3) The per share amount is not in accord with the net realized and unrealized
    gain (loss) on investments 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.
(4) Distributions in excess of net investment income are less than $0.001 per
    share.
(5) 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 reinvested at the
    net asset value on the reinvestment date. Total return is not computed on an
    annualized basis.
(6) Includes the Fund's share of its Portfolio's allocated expenses.
(7) 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.
(8) Annualized.

                       See notes to financial statements

                                       5

<PAGE>
 
Eaton Vance National Limited Maturity Municipals Fund as of September 30, 1998
NOTES TO FINANCIAL STATEMENTS (Unaudited)


1 Significant Accounting Policies

- --------------------------------------------------------------------------------
   Eaton Vance 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 offers three classes of
   shares: Class A (formerly Class II), Class B (formerly Class I) and Class C
   shares. Class A shares are sold subject to a sales charge imposed at the time
   of purchase. Class B and Class C shares are sold at net asset value and are
   subject to a contingent deferred sales charge (see Note 6). Class B shares
   held longer than (i) four years or (ii) the time at which the contingent
   deferred sales charge applicable to such shares expires will automatically
   convert to Class A 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 (100.0% at September 30, 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.

   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
   $4,446,913 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, 2002
   ($1,059), March 31, 2003 ($1,920,274), March 31, 2004 ($1,214,155), March 31,
   2005 ($990,979), and March 31, 2006 ($320,446). 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
   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.

                                       6
<PAGE>
 
Eaton Vance National Limited Maturity Municipals Fund as of September 30, 1998
NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D



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

   H Interim Financial Statements -- The interim financial statements relating
   to September 30, 1998, and for the six months then ended have not been
   audited by independent certified public accountants, but in the opinion of
   the Fund's management, reflect all adjustments, consisting only of normal
   recurring adjustments, necessary for the fair presentation of the financial
   statements.

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 income and 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. The tax treatment of
   distributions for the calendar year will be reported to shareholders prior to
   February 1, 1999, and will be based on tax accounting methods which may
   differ from amounts determined for financial statement purposes.

3  Shares of Beneficial Interest

- --------------------------------------------------------------------------------
   The Fund's 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 Fund shares were as follows:

<TABLE> 
<CAPTION> 

                                 Six Months Ended                
                                 September 30, 1998          Year Ended 
   Class A                       (Unaudited)                 March 31, 1998
   --------------------------------------------------------------------------
   <S>                           <C>                         <C> 
   Sales                                    302,621                      --

   Issued to shareholders
    electing to receive 
    payments of distributions           
    in Fund shares                           51,516                  86,113     

   Redemptions                             (658,280)             (1,509,686)

   Exchange to Class A            
    shares                                  421,959               3,411,349   

   Issued to EV Traditional
    National Limited 
    Maturity Municipals            
    Fund Shareholders                     1,224,418                      --
   --------------------------------------------------------------------------

   Net increase                           1,342,234               1,987,776
   --------------------------------------------------------------------------
</TABLE> 

<TABLE> 
<CAPTION> 

                                 Six Months Ended              
                                 September 30, 1998          Year Ended
   Class B                       (Unaudited)                 March 31, 1998 
   --------------------------------------------------------------------------
   <S>                           <C>                         <C>    
   Sales                                     79,633                 212,978

   Issued to shareholders
    electing to receive 
    payments of distributions           
    in Fund shares                           10,528                  65,151

   Redemptions                             (150,010)               (609,705)

   Exchange to Class A           
    shares                                 (421,959)             (3,411,349) 
   --------------------------------------------------------------------------

    Net decrease                           (481,808)             (3,742,925)
   --------------------------------------------------------------------------
</TABLE> 

<TABLE> 
<CAPTION> 
                                 Six Months Ended
                                 September 30, 1998
   Class C                       (Unaudited)
   --------------------------------------------------
   <S>                           <C> 
   Sales                                    679,092

   Issued to shareholders
    electing to receive 
    payments of distributions           
    in Fund shares                           12,398

   Redemptions                             (387,413)

   Issued to EV Classic
    National Limited 
    Maturity Municipals              
    Fund Shareholders                       778,824
   --------------------------------------------------

   Net increase                           1,082,901
   --------------------------------------------------
</TABLE> 
                                       7
<PAGE>
 
Eaton Vance National Limited Maturity Municipals Fund as of September 30, 1998
NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D



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.
  Eaton Vance Distributors, Inc. (EVD), a subsidiary of EVM and the Fund's
  principal underwriter, received $5,317 from the Fund as its portion of the
  sales charge on sales of Class A shares for the six months ended September 30,
  1998.

  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.

5 Distribution and Service Plans

  ------------------------------------------------------------------------------
  The Fund has adopted a distribution plan ("Class B Plan" and "Class C Plan")
  pursuant to Rule 12b-1 under the Investment Company Act of 1940 and a service
  plan ("Class A Plan,") (collectively, "the Plans"). The Plans require the Fund
  to pay the principal underwriter, EVD, amounts equal to 1/365 of 0.75% of the
  Fund's daily net assets attributable to Class B and Class C shares 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 B
  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 of each respective class, reduced by the aggregate
  amount of contingent deferred sales charges (see Note 6) and amounts
  theretofore paid to or payable to EVD. The amount payable to EVD with respect
  to each day is accrued on such day as a liability of the Fund and,
  accordingly, reduces The Fund's net assets. For the six months ended September
  30, 1998, the Fund paid or accrued $32,585 and $32,538 for Class B and Class C
  shares, respectively, to EVD, representing 0.75% of the average daily net
  assets for Class B and Class C shares. At September 30, 1998, the amount of
  Uncovered Distribution Charges of EVD calculated under the Plan was
  approximately $339,000 and $4,187,000 for Class B and Class C shares,
  respectively.

  In addition, the Plans also authorize each class to make payments of service
  fees to EVD, 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 Plans by authorizing the Fund to make quarterly
  service fee payments to EVD and Authorized Firms in amounts not expected to
  exceed 0.15% per annum of the Fund's average daily net assets attributable to
  Class A and Class B shares based on the value of Fund shares sold by such
  persons and remaining outstanding for at least one year. The Class C Plan
  requires the Fund to make monthly payments of service fees in amounts not
  expected to exceed 0.25% of the Fund's average daily net assets attributable
  to Class C shares for any fiscal year. Service fee payments for the six months
  ended September 30, 1998, amounted to $48,379, $6,386, and $7,567 for Class A,
  Class B, and Class C shares, respectively. Service fee payments are 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 when there are no outstanding Uncovered Distribution Charges of
  EVD.

  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 B shares made within four years of purchase. A CDSC is imposed on
  certain Class C shares redeemed within one year 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 B and Class C shares acquired
  by reinvestment of dividends or capital gains distributions. The CDSC for
  Class B shares is imposed at declining rates that begin at 3% in the case of
  redemptions in the first year of purchase. Class C shares are subject to a 1%
  CDSC if redeemed within one year of purchase. No CDSC is levied on shares
  which have been sold to EVM or its affiliates or to their respective employees
  or clients. 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

                                        8
<PAGE>
 
Eaton Vance National Limited Maturity Municipals Fund as of September 30, 1998
NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D




  Distribution Charges exist will be credited to the Fund. EVD received
  approximately $11,000 and $400 of CDSC paid by shareholders for Class B shares
  and Class C shares, respectively, for the six months ended September 30, 1998.

7 Investment Transactions

  ------------------------------------------------------------------------------
  Increases and decreases in the Fund's investment in the Portfolio for the six
  months ended September 30, 1998, aggregated $15,792,312 and $19,455,682,
  respectively.

8 Transfer of Net Assets

  ------------------------------------------------------------------------------
  On April 1, 1998, the existing Class I and Class II shares of EV Marathon
  National Limited Maturity Municipals Fund were designated Class B and Class A
  shares, respectively. In addition, the Fund acquired the net assets of the EV
  Traditional National Limited Maturity Municipals Fund and EV Classic National
  Limited Maturity Municipals Fund pursuant to an Agreement and Plan of
  Reorganization dated June 23, 1997. In accordance with the agreement, EV
  Marathon National Limited Maturity Municipals Fund, at the closing, issued
  1,224,418 Class A shares and 778,824 Class C shares of the Fund having an
  aggregate value of $12,949,960 and $7,722,266, respectively. As a result, the
  Fund issued 0.965 shares of Class A and one share of Class C for each share of
  EV Traditional National Limited Maturity Municipals Fund and EV Classic
  National Limited Maturity Municipals Fund, respectively. The transaction was
  structured for tax purposes to qualify as a tax free reorganization under the
  Internal Revenue Code. The EV Traditional National Limited Maturity Municipals
  Fund's and EV Classic National Limited Maturity Municipals Fund's net assets
  at the date of the transaction were $12,949,960 and $7,722,266, including
  $480,130 and $490,592 of unrealized appreciation, respectively. Directly after
  the merger, the combined net assets of the Eaton Vance National Limited
  Maturity Municipals Fund (formerly "EV Marathon National Limited Maturity
  Municipals Fund") were $92,201,674 with a net asset value of $10.58, $10.58
  and $9.92 for Class A, Class B and Class C, respectively.

9 Name Change

  ------------------------------------------------------------------------------
  Effective April 1, 1998, EV Marathon National Limited Maturity Municipals Fund
  changed its name to Eaton Vance National Limited Maturity Municipals
  Fund.
  
                                       9
<PAGE>
 
National Limited Maturity Municipals Portfolio as of September 30, 1998
PORTFOLIO OF INVESTMENTS (Unaudited)



Tax-Exempt Investments -- 100.0%  

<TABLE>
<CAPTION>
                       Amount
           Standard    (000's
Moody's    & Poor's    omitted)    Security                                    Value
- ------------------------------------------------------------------------------------------
<S>        <C>         <C>         <C>                                         <C>
Assisted Living -- 1.2%
- ------------------------------------------------------------------------------------------
NR         NR          $1,000      New Jersey EDA, (Chelsea at
                                   East Brunswick), (AMT),
                                   8.00%, 10/1/07                              $ 1,121,300
- ------------------------------------------------------------------------------------------
                                                                               $ 1,121,300
- ------------------------------------------------------------------------------------------

Cogeneration -- 4.2%
- ------------------------------------------------------------------------------------------
NR         BBB         $  470      Eastern Connecticut
                                   Resource Recovery
                                   Authority, (Wheelabrator Lisbon),
                                   (AMT), 5.50%, 1/1/20                        $   472,425
 
NR         BBB-         1,120      New Jersey EDA,
                                   (Trigen-Trenton), (AMT), 6.10%, 12/1/05       1,215,838

NR         BB+          1,250      New Jersey EDA, (Vineland
                                   Cogeneration) (AMT),
                                   7.875%, 6/1/19                                1,374,575

NR         NR             500      Palm Beach County, FL,
                                   (Okeelanta Power), (AMT),
                                   6.85%, 2/15/21/(1)/                             400,000

NR         NR             500      Palm Beach County, FL, (Osceola
                                   Power), (AMT), 6.95%, 1/1/22/(1)/               395,000
- ------------------------------------------------------------------------------------------
                                                                               $ 3,857,838
- ------------------------------------------------------------------------------------------

Economic Development Revenue -- 1.0%
- ------------------------------------------------------------------------------------------
NR         BB-         $  950      Michigan State Strategic Fund,
                                   (Crown Paper), 6.25%, 8/1/12                $   897,019
- ------------------------------------------------------------------------------------------
                                                                               $   897,019
- ------------------------------------------------------------------------------------------

Education -- 3.0%
- ------------------------------------------------------------------------------------------
Ba1        NR          $1,000      New Hampshire HEFA, (Colby-Sawyer
                                   College), 7.20%, 6/1/12                     $ 1,099,910

NR         BBB            500      New Hampshire HEFA, (Rivier
                                   College), 5.55%, 1/1/18                         511,940

Aa         AA-          1,700      University of Illinois, 0.00%, 4/1/15           778,379
                               
Aa         AA-          1,000      University of Illinois, 0.00%, 4/1/16           432,250
- ------------------------------------------------------------------------------------------
                                                                               $ 2,822,479
- ------------------------------------------------------------------------------------------

Escrowed / Prerefunded -- 14.4%
- ------------------------------------------------------------------------------------------
Aaa        AAA         $1,500      Grand Ledge, MI, Public School
                                   District, (MBIA), Prerefunded to
                                   5/1/04, 7.875%, 5/1/11                      $ 1,822,920
                                
NR         NR           3,500      Maricopa County, AZ, IDA,
                                   Multifamily, Escrowed to
                                   Maturity, 6.45%, 1/1/17                       3,968,369
</TABLE>

<TABLE>
<CAPTION>
                       Amount
           Standard    (000's
Moody's    & Poor's    omitted)    Security                                    Value
- ------------------------------------------------------------------------------------------
<S>        <C>         <C>         <C>                                         <C>

Escrowed / Prerefunded (continued)
- ------------------------------------------------------------------------------------------
NR         NR          $  990      Maricopa County, AZ, IDA, Multifamily,
                                   Escrowed to Maturity,                     
                                   7.876%, 1/1/11                              $ 1,197,623

Baa3       NR           1,340      Massachusetts HEFA, (Milford-
                                   Whitinsville Hospital), Escrowed to          
                                   Maturity, 7.125%, 7/15/02                     1,421,003

Aaa        NR           3,000      Massachusetts Turnpike Authority,
                                   Escrowed to Maturity,                       
                                   5.00%, 1/1/20/(2)/                            3,109,679

NR         NR           1,550      Saint Tammany Public Trust Finance
                                   Authority, LA (Christwood), Escrowed 
                                   to Maturity, 8.75%, 11/15/05                  1,824,986
- ------------------------------------------------------------------------------------------
                                                                               $13,344,580
- ------------------------------------------------------------------------------------------

General Obligations -- 12.0%
- ------------------------------------------------------------------------------------------
Baa2       BBB+        $4,000      Detroit, MI, 6.50%, 4/1/02/(3)/             $ 4,322,479
                               
A3         A-             750      New York City, NY, 0.00%, 8/1/07                512,325
                               
Aa1        AA+            750      Ohio State, 0.00%, 8/1/08                       496,875

NR         NR           1,800      Pennsylvania EDA, (Resource Recovery
                                   for Northampton), 6.75%, 1/1/07               1,982,304
                               
Baa1       A            1,500      Puerto Rico Aqueduct and Sewer
                                   Authority, 5.00%, 7/1/15                      1,522,455

NR         NR             500      San Juan, NM, Pueblo Development
                                   Authority, 7.00%, 10/15/06                      500,005
                               
NR         NR           1,755      Youngstown, OH, County School
                                   District, 6.40%, 7/1/00                       1,808,212
- ------------------------------------------------------------------------------------------
                                                                               $11,144,655
- ------------------------------------------------------------------------------------------

Hospital -- 6.9%
- ------------------------------------------------------------------------------------------
NR         NR          $1,900      Colorado Health Facilities Authority,
                                   (Steamboat Springs Health),              
                                   5.00%, 9/15/03                              $ 1,951,528

NR         NR             500      Colorado Health Facilities Authority,
                                   (Steamboat Springs Health),                  
                                   5.30%, 9/15/09                                  513,630

Baa        BBB-           450      Illinois Health Facilities Authority,
                                   (Proctor Community Hospital),              
                                   7.375%, 1/1/23                                  480,758

NR         BBB            500      Michigan Hospital Finance Authority,
                                   (Gratiot Community Hospital),              
                                   6.10%, 10/1/07                                  544,660

NR         BB-            500      New Hampshire HEFA, (Littleton
                                   Hospital Association),                     
                                   5.45%, 5/1/08                                   517,330
</TABLE>

                       See notes to financial statements

                                       10

<PAGE>
 
National Limited Maturity Municipals Portfolio as of September 30, 1998
PORTFOLIO OF INVESTMENTS (Unaudited) CONT'D

<TABLE>
<CAPTION>
                   Amount                                              
          Standard (000's                                                  
Moody's   & Poor's omitted)   Security                      Value         
- ---------------------------------------------------------------------------
Hospital (continued)
- ---------------------------------------------------------------------------
<S>       <C>      <C>        <C>                           <C>    
Baa       BBB-     $1,830     Richardson, TX, Hospital
                              Authority, (Richardson
                              Medical Center),                
                              6.50%, 12/1/12                $ 1,977,974
NR        NR          465     San Gorgonio, CA, Memorial
                              Health Care District,         
                              5.60%, 5/1/11                     472,105 
- ---------------------------------------------------------------------------
                                                            $ 6,457,985
- ---------------------------------------------------------------------------

Housing -- 5.8%
- ---------------------------------------------------------------------------
A2        NR       $1,005     Illinois Development
                              Finance Authority, Elderly
                              Housing, (Mattoon Tower),     
                              (Section 8), 6.35%, 7/1/10    $ 1,056,587
Baa3      NR          945     Illinois Development
                              Finance Authority, Elderly
                              Housing, (Rome Meadows),      
                              6.40%, 2/1/03                     981,014
Baa3      NR        1,145     Illinois Development
                              Finance Authority, Elderly
                              Housing, (Rome Meadows),      
                              6.65%, 2/1/06                   1,205,857
Aa2       AA        2,000     Wisconsin Housing and
                              Economic Development
                              Authority, (Home              
                              Ownership), (AMT), 6.45%,
                              9/1/27                          2,169,440
- ---------------------------------------------------------------------------
                                                            $ 5,412,898
- ---------------------------------------------------------------------------

Industrial Development Revenue -- 18.4%
- ---------------------------------------------------------------------------
NR        NR       $  690     Austin, TX, (Cargoport
                              Development LLC), (AMT),      
                              7.50%, 10/1/07                $   743,289
NR        NR          455     Austin, TX, (Cargoport
                              Development LLC), (AMT),      
                              8.30%, 10/1/21                    514,332
NR        BBB-      1,000     Clark County, NV, (Nevada
                              Power Co.), (AMT), 5.90%,     
                              10/1/30                         1,025,400
A3        A-        1,000     Columbus, NC (International
                              Paper Co.), 5.80%, 12/1/16      1,070,850
NR        NR        1,100     Eagle County, CO, Airport
                              Terminal Corp. (American
                              Airlines), (AMT), 6.75%,      
                              5/1/06                          1,186,328
NR        NR          900     Iowa Finance Authority,
                              (Southbridge Mall), 6.375%,   
                              12/1/13                           925,398
NR        NR        3,435     Jackson, TN, (Owens-Corning
                              Fiberglass), (AMT),
                              6.25%, 3/31/04(3)               3,555,224
A3        BBB+        500     Jones County, MS,
                              (International Paper Co.),    
                              5.80%, 10/1/21                    525,965
NR        NR          500     Kansas City, MO, IDR,
                              (Kingswood Manor), 5.80%,     
                              11/15/17(4)                       495,700
NR        NR          500     Kimball, NE, EDA, (Clean
                              Harbors, Inc.), (AMT),        
                              10.75%, 9/1/26                    554,280
NR        NR          620     Los Angeles, CA, Regional
                              Airport Improvement
                              Corporate Lease,
                              (TransWorld Airlines),        
                              6.125%, 5/15/00                   620,186
NR        NR        1,000     New Jersey EDA, (Holt
                              Hauling), 7.90%, 3/1/27         1,145,920
NR        NR          750     Ohio Solid Waste Revenue,
                              (Republic Engineered
                              Steels, Inc.), (AMT),         
                              9.00%, 6/1/21                     815,318
NR        BBB-      2,000     Pennsylvania EDA,
                              (Resources Recovery),         
                              (AMT), 7.05%, 12/1/10           2,241,260
NR        NR          500     Robbins, IL, Resource
                              Recovery, (AMT), 8.375%,      
                              10/15/10                          400,000  
NR        NR        1,265     Santa Fe, NM (Crow Hobbs),
                              8.25%, 9/1/05                   1,334,512
- ---------------------------------------------------------------------------
                                                            $17,153,962
- ---------------------------------------------------------------------------

Insured-Education -- 0.2%
- ---------------------------------------------------------------------------
Aaa       AAA      $  500     Southern Illinois
                              University, Housing and
                              Auxiliary Facilities,         
                              (MBIA), 0.00%, 4/1/17         $   204,900 
- ---------------------------------------------------------------------------
                                                            $   204,900
- ---------------------------------------------------------------------------

Insured-General Obligations -- 2.3%
- ---------------------------------------------------------------------------
Aaa       AAA      $1,000     Kalamazoo, MI, (MBIA),
                              5.40%, 5/1/14                 $ 1,093,530
Aaa       AAA       1,000     New York State Local
                              Government Assistance
                              Corp., (MBIA),                
                              5.00%, 4/1/21                   1,003,910 
- ---------------------------------------------------------------------------
                                                            $ 2,097,440
- ---------------------------------------------------------------------------

Insured-Hospital -- 2.6%
- ---------------------------------------------------------------------------
Aaa       AAA      $2,000     El Paso County, TX,
                              Hospital District, (MBIA),    
                              0.00%, 8/15/06                $ 1,447,280 
Aaa       AAA       1,000     Massachusetts HEFA,
                              (Caregroup), (MBIA), 5.00%,   
                               7/1/18                           998,750 
- --------------------------------------------------------------------------
                                                            $ 2,446,030
- --------------------------------------------------------------------------
 
Insured-Housing -- 2.5%
- --------------------------------------------------------------------------
Aaa       AAA      $2,115     Massachusetts HFA,
                              (Harborpoint Development),
                              (AMBAC), (AMT), 6.20%,        
                              12/1/10                       $ 2,318,040 
- --------------------------------------------------------------------------
                                                            $ 2,318,040
- --------------------------------------------------------------------------

Insured-Lease Revenue /
Certificates of Participation -- 1.1%
- --------------------------------------------------------------------------
Aaa       AAA      $1,000     West Valley City, UT,
                              (AMBAC), 4.45%, 4/15/10       $   995,530
- --------------------------------------------------------------------------
                                                            $   995,530
- --------------------------------------------------------------------------
</TABLE>
                       See notes to financial statements

                                      11
<PAGE>
 
National Limited Maturity Municipals Portfolio as of September 30, 1998
PORTFOLIO OF INVESTMENTS (Unaudited) CONT'D

<TABLE>
<CAPTION>
                     Amount
          Standard   (000's
Moody's   & Poor's   omitted)   Security                               Value
- ----------------------------------------------------------------------------------
<C>       <C>        <C>        <S>                                    <C>
Insured-Special Tax Revenue -- 0.6%
- ----------------------------------------------------------------------------------
Aaa       AAA        $  500     George L. Smith, (Georgia World 
                                Congress Center-Domed Stadium),
                                (MBIA), (AMT), 6.00%, 7/1/06(4)        $   533,315
- ----------------------------------------------------------------------------------
                                                                       $   533,315
- ----------------------------------------------------------------------------------

Miscellaneous -- 1.2%
- ----------------------------------------------------------------------------------
Baa3      NR         $  500     Mashantucket, CT, (Western Pequot
                                Tribe), 5.55%, 9/1/08                  $   536,650

NR        NR            600     Tax Revenue Exempt Securities       
                                Trust, Community Health Provider,
                                (Pooled Loan Program Various States       
                                Trust Certificates), 6.00%, 12/1/36        627,924
- ----------------------------------------------------------------------------------
                                                                       $ 1,164,574
- ----------------------------------------------------------------------------------

Nursing Home -- 10.0%
- ----------------------------------------------------------------------------------
NR        NR         $1,105     Arizona Health Facilities Authority
                                Assisted Living Facilities, (Mesa),
                                7.625%, 1/1/06                         $ 1,163,112

NR        A+          3,500     California Statewide Communities
                                Development Corp., (Pacific Homes),
                                5.90%, 4/1/09                            3,814,929

NR        NR            650     Citrus County, FL, IDA, (Beverly
                                Enterprises), 5.00%, 4/1/03                661,525

NR        NR            985     Clovis, NM, IDR, (Retirement
                                Ranches, Inc.), 7.75%, 4/1/19            1,099,999

NR        NR            850     Fairfield, OH, EDA, (Beverly
                                Enterprises), 8.50%, 1/1/03                919,989

NR        NR          1,500     Massachusetts IFA, (Age Institute
                                of Massachusetts), 7.60%, 11/1/05        1,622,400
- ----------------------------------------------------------------------------------
                                                                       $ 9,281,954
- ----------------------------------------------------------------------------------

Pooled Loans -- 4.6%
- ----------------------------------------------------------------------------------
Aa2       NR         $1,900     Arizona Educational Loan Marketing
                                Corp., (AMT), 6.25%, 6/1/06            $ 2,112,211

A         NR          1,000     Arizona Student Loan Acquisition
                                Authority, (AMT), 7.625%, 5/1/10         1,108,580

A         NR          1,000     Arkansas State Student Loan 
                                Authority, (AMT), 6.25%, 6/1/10          1,056,240
- ----------------------------------------------------------------------------------
                                                                       $ 4,277,031
- ----------------------------------------------------------------------------------

Senior Living / Life Care -- 4.2%
- ----------------------------------------------------------------------------------
NR        NR         $1,025     Florence, KY, Housing Facilities,
                                (Bluegrass Housing), 7.25%, 5/1/07     $ 1,097,509

NR        NR          2,000     Illinois Health Facilities 
                                Authority, (Lutheran Social
                                Services), 6.125%, 8/15/10               2,106,840

NR        NR            250     Massachusetts IFA, (Forge Hill),
                                (AMT), 6.75%, 4/1/30                       247,265

NR        NR         $  475     Vermont IDA, (Wake Robins),
                                8.00%, 4/1/99                          $   476,131
- ----------------------------------------------------------------------------------
                                                                       $ 3,927,745
- ----------------------------------------------------------------------------------

Transportation -- 3.8%
- ----------------------------------------------------------------------------------
Baa1      BBB        $2,000     Denver, CO City and County Airport,
                                (AMT), 7.00%, 11/15/99                 $ 2,070,220

NR        NR            260     Memphis-Shelby County, TN, Airport
                                Authority, 6.125%, 12/1/16                 270,824

NR        NR          1,000     Northwest Arkansas Regional Airport
                                Authority, (AMT), 7.625%, 2/1/27         1,160,380
- ----------------------------------------------------------------------------------
                                                                       $ 3,501,424
- ----------------------------------------------------------------------------------

Total Tax-Exempt Investments -- 100.0%
    (identified cost $86,616,559)                                      $92,960,699
- ----------------------------------------------------------------------------------
</TABLE> 

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 September 30, 1998,
11.2% 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
3.6% to 7.6% of total investments.

At September 30, 1998, the concentration of the Portfolio's investments in the
various states, determined as a percentage of total investments is as follows:

          Arizona                                                11%
          Massachusetts                                          12%
          Michigan                                               10%
          Others, representing less than 10% individually        67%

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

(1)  Non-income producing security.

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

(3)  Security (or a portion thereof) has been segregated to cover when-issued
     securities.

(4)  When-issued security.


                       See notes to financial statements


                                      12

<PAGE>
 
National Limited Maturity Municipals Portfolio as of September 30, 1998

FINANCIAL STATEMENTS (Unaudited)

Statement of Assets and Liabilities 

<TABLE>
As of September 30, 1998
Assets
- -------------------------------------------------------------------------
<S>                                                           <C>
Investments, at value (identified cost, $86,616,559)          $92,960,699

Cash                                                            1,955,937

Interest receivable                                             1,677,421

Other assets                                                       19,800
- -------------------------------------------------------------------------
Total assets                                                  $96,613,857 
- -------------------------------------------------------------------------

Liabilities
- -------------------------------------------------------------------------
Payable for investments purchased                             $ 4,026,665

Payable for daily variation margin on open
  financial futures contracts                                      37,067

Other accrued expenses                                              5,485
- -------------------------------------------------------------------------
Total liabilities                                             $ 4,069,217
- -------------------------------------------------------------------------
Net Assets applicable to investors' interest in Portfolio     $92,544,640
- -------------------------------------------------------------------------

Sources of Net Assets
- -------------------------------------------------------------------------
Net proceeds from capital contributions and withdrawals       $86,249,140

Net unrealized appreciation (computed on the basis 
  of identified cost)                                           6,295,500
- -------------------------------------------------------------------------
Total                                                         $92,544,640
- -------------------------------------------------------------------------
</TABLE>


Statement of Operations

<TABLE>
<CAPTION>
For the Six Months Ended
September 30, 1998
Investment Income
- -------------------------------------------------------------------------
<S>                                                           <C>
Interest                                                      $ 2,707,045
- -------------------------------------------------------------------------
Total Investment income                                       $ 2,707,045
- -------------------------------------------------------------------------

Expenses
- -------------------------------------------------------------------------
Investment adviser fee                                        $   217,609

Trustees fees and expenses                                          3,264

Custodian fee                                                      28,311

Legal and accounting services                                      21,874

Amortization of organization expenses                                 219

Miscellaneous                                                      15,018
- -------------------------------------------------------------------------
Total expenses                                                $   286,295
- -------------------------------------------------------------------------
Deduct--
  Reduction of custodian fee                                  $     6,590
- -------------------------------------------------------------------------
Total expense reductions                                      $     6,590
- -------------------------------------------------------------------------

Net expenses                                                  $   279,705
- -------------------------------------------------------------------------

Net investment income                                         $ 2,427,340
- -------------------------------------------------------------------------


Realized and Unrealized Gain (Loss)
- -------------------------------------------------------------------------
Net realized gain (loss)--
  Investment transactions (Identified cost basis)             $   231,482
  Financial futures contracts                                    (244,201)
- -------------------------------------------------------------------------
Net realized loss                                             $   (12,719)
- -------------------------------------------------------------------------
Change in unrealized appreciation (depreciation)--
  Investments (identified cost basis)                         $   694,952
  Financial futures contracts                                     (28,833)
- -------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation)          $   666,119
- -------------------------------------------------------------------------

Net realized and unrealized gain                              $   653,400
- -------------------------------------------------------------------------

Net increase in net assets from operations                    $ 3,080,740
- -------------------------------------------------------------------------
</TABLE>

                       See notes to financial statements

                                      13
<PAGE>
 
National Limited Maturity Municipals Portfolio as of September 30, 1998

FINANCIAL STATEMENTS CONT'D

Statements of Changes in Net Assets


<TABLE>
<CAPTION>
                                    Six Months Ended
Increase (Decrease)                 September 30, 1998        Year Ended
in Net Assets                       (Unaudited)               March 31, 1998
- ----------------------------------------------------------------------------
<S>                                 <C>                       <C>
From operations--
  Net investment income             $  2,427,340              $   5,333,661
  Net realized loss                      (12,719)                  (161,876)
  Net change in unrealized
    appreciation (depreciation)          666,119                  4,669,424
- ----------------------------------------------------------------------------
Net increase in net assets
  from operations                   $  3,080,740              $   9,841,209
- ----------------------------------------------------------------------------
Capital transactions--
  Contributions                     $ 15,792,322              $  44,850,231
  Withdrawals                        (19,455,682)               (64,067,696)
- ----------------------------------------------------------------------------
Net decrease in net assets from
  capital transactions              $ (3,663,360)             $ (19,217,465)
- ----------------------------------------------------------------------------

Net decrease in net assets          $   (582,620)             $  (9,376,256)
- ----------------------------------------------------------------------------

Net Assets
- ----------------------------------------------------------------------------
At beginning of period              $ 93,127,260              $ 102,503,516
- ----------------------------------------------------------------------------
At end of period                    $ 92,544,640              $  93,127,260
- ----------------------------------------------------------------------------
</TABLE>



                       See notes to financial statements

                                      14

<PAGE>
 
National Limited Maturity Municipals Portfolio as of September 30, 1998
FINANCIAL STATEMENTS CONT'D
Supplementary Data

<TABLE>
                                            Six Months Ended                          Year Ended March 31,
                                            September 30, 1998    -----------------------------------------------------------
                                            (Unaudited)             1998       1997        1996        1995        1994(1)
- -----------------------------------------------------------------------------------------------------------------------------
Ratios to average daily net assets
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>                   <C>        <C>         <C>         <C>         <C>
Expenses (2)                                          0.62%(3)       0.60%       0.60%       0.57%       0.53%       0.52%(3)

Expenses after custodian fee reduction                0.61%(3)       0.59%       0.58%       0.56%         --          --

Net investment income                                 5.31%(3)       5.53%       5.45%       5.08%       5.02%       4.74%(3)

Portfolio Turnover                                      11%            41%         68%         68%         56%         21%
- -----------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (000's omitted)          $92,545        $93,127    $102,504    $134,776    $169,621    $177,842
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)  For the period from the start of business, May 3, 1993, to March 31, 1994.

(2)  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 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.

(3)  Annualized.


                       See notes to financial statements


                                      15

<PAGE>
 
National Limited Maturity Municipals Portfolio as of September 30, 1998 

NOTES TO FINANCIAL STATEMENTS (Unaudited)



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.



                                       16
<PAGE>
 
National Limited Maturity Municipals Portfolio as of September 30, 1998 

NOTES TO FINANCIAL STATEMENTS (Unaudited) 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.

  K Interim Financial Statements -- The interim financial statements relating to
  September 30, 1998, and for the six months then ended have not been audited by
  independent certified public accountants, but in the opinion of the Fund's
  management, reflect all adjustments, consisting only of normal recurring
  adjustments, necessary for the fair presentation of the financial statements.

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 six months ended September 30, 1998, the fee was equivalent to 0.48% of
  the Portfolio's average net assets for such period and amounted to $217,609.
  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 six months ended September 30, 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 $10,149,157 and $11,059,312 respectively,
  for the six months ended September 30, 1998.

5 Federal Income Tax Basis of Investments
  ------------------------------------------------------------------------------
  The cost and unrealized appreciation/depreciation in value of the investments
  owned at September 30, 1998, as computed on a federal income tax basis, were
  as follows:
<TABLE> 
<CAPTION> 

  <S>                                                                  
                                                               <C>     
  Aggregate cost                                           $    86,616,559
  ------------------------------------------------------------------------------
  Gross unrealized appreciation                            $     6,518,847
  
  Gross unrealized depreciation                                   (174,707)
  ------------------------------------------------------------------------------

  Net unrealized appreciation                              $     6,344,140
  ------------------------------------------------------------------------------
</TABLE> 
        

                                    17
<PAGE>
 
National Limited Maturity Municipals Portfolio as of September 30, 1998

NOTES TO FINANCIAL STATEMENTS (Unaudited) CONT'D


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 September 30, 1998 were as
  follows:


   Futures
   Contracts                                                    Net Unrealized
   Expiration Date   Contracts                        Position  Depreciation
   ----------------------------------------------------------------------------
   12/98             29 U.S. Treasury Bonds           Short     $  (48,640)
   ----------------------------------------------------------------------------

   At September 30, 1998, the Portfolio had sufficient cash and/or securities
   to cover margin requirements on open futures contracts.

                                       18
<PAGE>
 
Eaton Vance National Limited Maturity Municipals Fund as of September 30, 1998
INVESTMENT MANAGEMENT

Eaton Vance National Limited Maturity Municipals Fund

             Officers                   Independent Trustees            
             Thomas J. Fetter           Donald R. Dwight                
             President                  President, Dwight Partners, Inc.
                                                                                
             James B. Hawkes            Samuel L. Hayes, III            
             Vice President and         Jacob H. Schiff Professor of Investment
             Trustee                    Banking, Harvard University Graduate
                                        School of Business Administration  
             Robert B. MacIntosh                                                
             Vice President             Norton H. Reamer              
                                        Chairman and Chief Executive Officer,
             James L. O'Connor          United Asset Management Corporation 
             Treasurer                                                      
                                        John L. Thorndike                
             Alan R. Dynner             Formerly Director, Fiduciary Company
             Secretary                  Incorporated                     
                                   
                                        Jack L. Treynor                  
                                        Investment Adviser and Consultant


National Limited Maturity Municipals Portfolio

             Officers                   Independent Trustees                  
             Thomas J. Fetter           Donald R. Dwight                      
             President                  President, Dwight Partners, Inc.      
                                        
             James B. Hawkes            Samuel L. Hayes, III                  
             Vice President and         Jacob H. Schiff Professor of Investment
             Trustee                    Banking, Harvard University Graduate  
                                        School of Business Administration     
             William H. Ahern, Jr.      
             Vice President and         Norton H. Reamer                      
             Portfolio Manager          Chairman and Chief Executive Officer, 
                                        United Asset Management Corporation   
             Robert B. MacIntosh        
             Vice President             John L. Thorndike                     
                                        Formerly Director, Fiduciary Company  
             James L. O'Connor          Incorporated                          
             Treasurer                  
                                        Jack L. Treynor                       
             Alan R. Dynner             Investment Adviser and Consultant      
             Secretary               
      


                                      19

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

Adminstrator of 
Eaton Vance 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




Eaton Vance 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, its distribution including plan,
sales charges and expenses. Please read the prospectus carefully before you
invest or send money.
- -----------------------------------------------------------------------------
                                                  LNASRC/11-98



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