INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
N-30D, 1996-06-20
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<PAGE>   1
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL      Two World Trade Center, New York,
INCOME TRUST                                   New York 10048
LETTER TO THE SHAREHOLDERS April 30, 1996
 
DEAR SHAREHOLDER:
 
During the first six months of InterCapital California Insured Municipal Income
Trust's current fiscal year, interest rates initially declined, but reversed
direction in February and began to move higher. Last year's favorable bond
market environment was created by proposals to achieve a balanced federal budget
within five to seven years and by continued easing of Federal Reserve Board
monetary policy. However, budget negotiations reached a political impasse early
in 1996 and federal offices were partially closed. This had an adverse impact on
bonds. Concerns also developed about an increase in the pace of the economic
recovery, which was marked by unexpectedly strong job growth in March and rising
commodity prices. The bond market reacted to these developments by pushing
yields sharply higher.
 
MUNICIPAL MARKET CONDITIONS
 
Long-term municipal revenue bond yields as tracked by The Bond Buyer Revenue
Bond Index* moved from 6.02 percent in October 1995 to a low of 5.63 percent in
January 1996. Interest rates subsequently began to rise in mid-February on signs
of stronger economic growth and renewed inflationary fears. The Index yield
reached 6.16 percent in April. Yields on one-year municipal notes declined from
3.82 percent to 3.70 percent over the past six months. The yield pickup for
extending maturities from one-to-thirty years was 246 basis points at the end of
April.
 
The risk of flat-tax legislation had caused the ratio of Revenue Bond Index
yields to 30-year U.S. Treasury bond yields to rise from 85 to 94 percent
between March and September 1995. However, as the prospects of a flat tax faded,
the ratio improved to 92 percent by the end of April.
 
- ---------------------
*The Bond Buyer Revenue Bond Index is an arithmetic average of the yields of 25
 selected municipal revenue bonds with 30-year maturities. Credit ratings of
 these bonds range from Aa1 to Baa1 by Moody's Investors Service, Inc., and AA+
 to A- by Standard & Poor's Corp.
<PAGE>   2
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
 
LETTER TO THE SHAREHOLDERS April 30, 1996, continued
 
A declining ratio means that municipal bond prices have outperformed U.S.
Treasury prices. Over the previous eight year period prior to the flat-tax
debate, long-term municipal yields averaged 89 percent of U.S. Treasury yields.
 
Municipal underwriting activity was fueled by the trend of lower interest rates
in 1995. Between November 1995 and April 1996, new issue volume increased 45
percent versus the same period a year ago. Despite a resurgence in underwriting,
dealers have continued to withdraw from the municipal business.
 
PERFORMANCE
 
The Trust's net asset value (NAV) declined from $13.40 to $12.94 per share
during the six-month period ended April 30, 1996. Based on this NAV change plus
reinvestment of tax-free dividends totaling $0.36 per share, the Trust's total
return was -0.47 percent. Over the same period, the Trust's market price on the
New York Stock Exchange declined from $11.75 to $11.50 per share. Based on this
market price change and reinvestment of tax-free dividends, the Trust's total
return was 0.88 percent. The Trust began the period trading at a 12 percent
discount to NAV and closed at a 11 percent discount. Undistributed net
investment income improved to $0.055 per share on April 30, 1996 versus $0.040
per share six months ago.
 
PORTFOLIO STRUCTURE
 
On April 30, 1996, the Trust's $239 million of net assets were diversified among
9 long-term municipal sectors and 38 credits. The five largest sectors
represented 78 percent of net assets. The average maturity and call protection
of the Trust's long-term portfolio were 23 and 7 years, respectively. Each
position in the portfolio was backed by triple "A" rated bond insurers. This is
to insure the timely payment of principal and interest.


<TABLE>
<CAPTION>                                    
FIVE LARGEST SECTORS AS OF APRIL 30, 1996 
(% OF NET ASSETS)                                                       
<S>                  <C>                                                   
WATER & SEWER        22%                                                   
ELECTRIC             17%                                                   
PUBLIC FACILITIES    15%                                                   
TAX ALLOCATION       15%                                                   
TRANSPORTATION        9%
OTHER                22%
</TABLE>

<TABLE>
<CAPTION>
CREDIT ENHANCEMENTS AS OF APRIL 30, 1996                     
(% OF TOTAL LONG-TERM INVESTMENTS)   
<S>          <C>                   
MBIA         53%                   
AMBAC        23%                   
FGIC         20%                   
FSA           4%                   
</TABLE>
<PAGE>   3
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
 
LETTER TO THE SHAREHOLDERS April 30, 1996, continued
 
THE IMPACT OF LEVERAGING
 
As discussed in previous reports, the total income available for distribution to
common shareholders includes incremental income provided by the Trust's
outstanding Auction Rate Preferred Shares (ARPS). ARPS dividends reflect
prevailing short-term interest rates on maturities normally ranging from one
week to one year. Incremental income to common shares depends on two factors:
first, the spread between interest earned on the long-term bonds in the
established portfolio of investments and the ARPS auction rate plus ARPS
expenses; second, the amount of ARPS outstanding. The greater the amount of ARPS
outstanding, the greater the amount of incremental income available for
distribution to common shareholders.
 
ARPS yields ranged between 3.37 and 4.19 percent during the six months ended
April 30, 1996. Over the same period, ARPS leverage contributed $0.03 per share
to common share earnings. As of April 30, 1996, $65 million in ARPS were
outstanding, which represented 27 percent of net assets.
 
LOOKING AHEAD
 
Tax-reduction proposals may receive additional publicity. However, the balance
between the supply of new issues and demand created by maturities and calls for
redemption should remain positive for the municipal market. Long-term municipal
securities currently yield 90 percent of the yield on U.S. Treasury securities
and may be expected to move in tandem with the Treasury market.
 
The Trust's procedure for reinvestment of all dividends and distributions on
common shares is through purchases in the open market. This method helps to
support the market value of the Trust's shares. In addition, we would like to
remind you that the Trustees have approved a procedure whereby the Trust, when
appropriate, may purchase shares in the open market or in privately negotiated
transactions at a price not above market value or net asset value, whichever is
lower at the time of purchase. During the six-month period ended April 30, 1996,
the Trust purchased and retired 285,900 shares of common stock at a weighted
average market discount of 12.79 percent. The Trust may also utilize procedures
to reduce or eliminate the amount of outstanding ARPS, including their purchase
in the open market or in privately negotiated transactions.
<PAGE>   4
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
 
LETTER TO THE SHAREHOLDERS April 30, 1996, continued
 
We appreciate your ongoing support of InterCapital California Insured Municipal
Income Trust and look forward to continuing to serve your investment needs.
 
Very truly yours,
 
/s/ CHARLES A. FIUMEFREDDO
- --------------------------
CHARLES A. FIUMEFREDDO
Chairman of the Board
<PAGE>   5
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
PORTFOLIO OF INVESTMENTS April 30, 1996 (unaudited)
 
<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                                                                 COUPON      MATURITY
THOUSANDS                                                                                  RATE         DATE           VALUE
- --------------------------------------------------------------------------------------------------------------------------------
<C>           <S>                                                                         <C>         <C>           <C>
              CALIFORNIA EXEMPT MUNICIPAL BONDS (98.0%)
              General Obligation (6.7%)
$  9,000      California, Various Purpose 04/01/93 (FSA)..............................      5.50 %     04/01/19     $  8,411,130
              Industry,
   3,000      Refg Issue of 1993 (MBIA)...............................................      5.50       07/01/13        2,924,970
   4,900      Refg Issue of 1993 (MBIA)...............................................      5.50       07/01/16        4,604,236
- --------                                                                                                              ----------
  16,900                                                                                                              15,940,336
- --------                                                                                                              ----------
              Electric Revenue (17.0%)
   5,000      Los Angeles Department of Water & Power, Refg Issue of 1993
               (Secondary MBIA).......................................................      5.875      09/01/30        4,894,800
   8,000      M-S-R Public Power Agency, San Juan Refg Ser F (AMBAC)..................      6.00       07/01/20        7,999,200
   7,000      Northern California Transmission Agency, California - Oregon
               Transmission
              Refg Ser 1993 A (MBIA)..................................................      5.25       05/01/20        6,287,610
              Sacramento Municipal Utility District,
   3,000      Refg 1993 Ser D (FGIC)..................................................      5.25       11/15/12        2,832,000
   8,000      Refg 1993 Ser D (MBIA)..................................................      5.625      11/15/15        7,666,240
  12,000      Southern California Public Power Authority, Power 1993 Sub Refg Ser A
               (FGIC).................................................................      5.45       07/01/17       11,065,440
- --------                                                                                                              ----------
  43,000                                                                                                              40,745,290
- --------                                                                                                              ----------
              Hospital Revenue (7.5%)
   4,150      Bakersfield, Adventist Health West Ser 1993 (MBIA)......................      5.50       03/01/19        3,864,231
   3,000      California Health Facilities Financing Authority, Children's
               Hospital - San Diego
               Ser 1993 (MBIA)........................................................      5.75       07/01/23        2,876,550
              California Statewide Communities Development Authority,
   5,000       Motion Picture & Television Fund COPs (AMBAC)..........................      5.375      01/01/20        4,542,800
   5,000       UniHealth America 1993 Ser A COPs (AMBAC)..............................      5.50       10/01/14        4,733,950
   2,000      Marysville, Fremont - Rideout Health Group Refg Ser 1993-A (AMBAC)......      5.55       01/01/13        1,960,660
- --------                                                                                                              ----------
  19,150                                                                                                              17,978,191
- --------                                                                                                              ----------
              Mortgage Revenue - Single Family (1.3%)
   3,000      California Housing Finance Agency, Home 1996 Ser E (AMT) (MBIA).........      6.05       08/01/15        2,969,400
- --------                                                                                                              ----------
              Public Facilities Revenue (15.1%)
  10,000      Alameda County, Santa Rita Jail 1993 Refg COPs (MBIA)...................      5.70       12/01/14        9,706,300
  14,000      Beverly Hills Public Financing Authority, 1993 Refg Ser A (MBIA)........      5.65       06/01/15       13,264,440
   9,000      California Public Works Board, Corrections Refg 1993 Ser B (MBIA).......      5.50       12/01/12        8,826,930
   5,000      Modesto, Community Center Refg 1993 Ser A COPs (AMBAC)..................      5.00       11/01/23        4,397,550
- --------                                                                                                              ----------
  38,000                                                                                                              36,195,220
- --------                                                                                                              ----------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>   6
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
PORTFOLIO OF INVESTMENTS April 30, 1996 (unaudited) continued
 
<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                                                                 COUPON      MATURITY
THOUSANDS                                                                                  RATE         DATE           VALUE
- --------------------------------------------------------------------------------------------------------------------------------
<C>           <S>                                                                         <C>         <C>           <C>
              Tax Allocation (14.8%)
$  7,000      Long Beach Financing Authority, Ser 1992 (AMBAC)........................      5.50 %     11/01/22     $  6,494,740
   5,000      Orange Redevelopment Agency, Southwest Refg Issue of 1993 A (AMBAC).....      5.70       10/01/23        4,766,900
   7,500      Port Hueneme Redevelopment Agency, Central Community 1993 Refg
               (AMBAC)................................................................      5.50       05/01/23        6,992,175
   6,000      Poway Redevelopment Agency, Paguay Sub Refg Ser 1993 (FGIC).............      5.50       12/15/23        5,620,200
   3,000      Riverside Redevelopment Agency, Merged Refg 1993 Ser A (MBIA)...........      5.625      08/01/23        2,822,850
   5,000      Santa Clara Redevelopment Agency, Bayshore North 1992 Refg (AMBAC)......      5.75       07/01/14        4,878,550
   4,000      Simi Valley Public Financing Authority, 1993 Refg (MBIA)................      5.50       09/01/15        3,794,480
- --------                                                                                                              ----------
  37,500                                                                                                              35,369,895
- --------                                                                                                              ----------
              Transportation Facilities Revenue (9.3%)
   8,000      Los Angeles County Metropolitan Transportation Authority, Sales Tax Refg
               Ser 1993-A (MBIA)......................................................      5.625      07/01/18        7,643,520
   7,000      Los Angeles County Transportation Commission, Second Sr Ser 1992 A
               (MBIA).................................................................      6.00       07/01/23        6,971,440
   5,000      San Francisco Airports Commission, San Francisco Int'l Airport
               Second Ser Refg Issue 2 (MBIA).........................................      6.75       05/01/20        5,394,250
   2,300      San Francisco Bay Area Rapid Transit District, Sales Tax Ser 1995
               (FGIC).................................................................      5.50       07/01/20        2,176,444
- --------                                                                                                              ----------
  22,300                                                                                                              22,185,654
- --------                                                                                                              ----------
              Water & Sewer Revenue (21.9%)
  10,000      California Department of Water Resources, Central Valley Ser L
               (Secondary MBIA).......................................................      5.75       12/01/19        9,673,800
   7,000      Eastern Municipal Water District, Ser 1993-A COPs (FGIC)................      5.25       07/01/23        6,214,600
  10,000      Los Angeles, Wastewater Refg Ser 1993-A (MBIA)..........................      5.80       06/01/21        9,779,700
   3,000      Oceanside, Water 1993 Refg COPs (AMBAC).................................      5.70       08/01/14        2,891,010
   3,500      Redding Joint Powers Financing Authority, Wastewater Refg 1992 Ser A
               (FGIC).................................................................      6.00       12/01/11        3,594,185
   2,500      San Elijo Joint Powers Authority, 1993 Refg (FGIC)......................      5.00       03/01/20        2,184,950
   5,000      Santa Maria, Local Water & Refg Ser 1993 COPs (FGIC)....................      5.50       08/01/21        4,615,500
   9,000      South County Regional Wastewater Authority, Morgan Hill Ser 1992 B
               (FGIC).................................................................      5.50       08/01/22        8,352,000
   5,000      West & Central Basin Financing Authority, Water Ser 1992 (AMBAC)........      6.125      08/01/22        5,039,650
- --------                                                                                                              ----------
  55,000                                                                                                              52,345,395
- --------                                                                                                              ----------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>   7
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
PORTFOLIO OF INVESTMENTS April 30, 1996 (unaudited) continued
 
<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                                                                 COUPON      MATURITY
THOUSANDS                                                                                  RATE         DATE           VALUE
- --------------------------------------------------------------------------------------------------------------------------------
<C>           <S>                                                                         <C>         <C>           <C>
              Other Revenue (4.4%)
$  1,250      Sacramento Area Flood Control Agency, Capital Assessment District #2
               Ser 1995 (FGIC)........................................................      5.375%     10/01/25     $  1,155,538
  10,000      Puerto Rico Telephone Authority, Refg Ser M (MBIA)......................      5.45       01/16/15        9,481,400
- --------                                                                                                            ------------
  11,250                                                                                                              10,636,938
- --------                                                                                                            ------------
 246,100      TOTAL CALIFORNIA EXEMPT MUNICIPAL BONDS (Identified Cost $242,711,616)...........................      234,366,319
- --------                                                                                                            ------------
                                                                                                                    
              CALIFORNIA EXEMPT SHORT-TERM MUNICIPAL OBLIGATION (0.1%)
     300      California Health Facilities Financing Authority, St Joseph Health 1991
- --------       Ser B
               (Demand 05/01/96) (Identified Cost $300,000)...........................      3.45*      07/01/09          300,000
                                                                                                                    ------------
$246,400      TOTAL INVESTMENTS (Identified Cost $243,011,616) (a)....................................     98.1%     234,666,319
========
              CASH AND OTHER ASSETS IN EXCESS OF LIABILITIES............................................    1.9        4,493,313
                                                                                                         ------     ------------
              NET ASSETS...............................................................................   100.0%    $239,159,632
                                                                                                         ======     ============
</TABLE>
 
- ---------------------
 
   AMT        Alternative Minimum Tax.
   COPs       Certificates of Participation.
    *         Current coupon of variable rate security.
   (a)        The aggregate cost for federal income tax purposes approximates
              identified cost. The aggregate gross unrealized appreciation was
              $106,941 and the aggregate gross unrealized depreciation was
              $8,452,238, resulting in net unrealized depreciation of
              $8,345,297.

Bond Insurance:
  AMBAC       AMBAC Indemnity Corporation.
   FGIC       Financial Guaranty Insurance Company.
   FSA        Financial Security Assurance Inc.
   MBIA       Municipal Bond Investors Assurance Corporation.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>   8
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
FINANCIAL STATEMENTS
 
<TABLE>
<S>                                                                       <C>
STATEMENT OF ASSETS AND LIABILITIES
April 30, 1996 (unaudited)
ASSETS:
Investments in securities, at value
 (identified cost $243,011,616).......................................    $234,666,319
Cash..................................................................          68,405
Interest receivable...................................................       4,523,755
Deferred organizational expenses......................................          13,144
Prepaid expenses......................................................          39,673
                                                                          ------------
    TOTAL ASSETS......................................................     239,311,296
                                                                          ------------
LIABILITIES:
Investment management fee payable.....................................          73,831
Accrued expenses......................................................          77,833
                                                                          ------------
    TOTAL LIABILITIES.................................................         151,664
                                                                          ------------
NET ASSETS:
Preferred shares of beneficial interest (1,000,000 shares authorized
 of non-participating $.01 par value, 1,300 shares outstanding).......      65,000,000
                                                                          ------------
Common shares of beneficial interest (unlimited shares authorized of
 $.01 par value, 13,464,113 shares outstanding).......................     188,664,616
Net unrealized depreciation...........................................      (8,345,297)
Accumulated undistributed net investment income.......................         742,183
Accumulated net realized loss.........................................      (6,901,870)
                                                                          ------------
    NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS......................     174,159,632
                                                                          ------------
    TOTAL NET ASSETS..................................................    $239,159,632
                                                                          ============
NET ASSET VALUE PER COMMON SHARE
 ($174,159,632 divided by 13,464,113 common shares outstanding).......          $12.94
                                                                                ======
</TABLE>
 
        SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>   9
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
FINANCIAL STATEMENTS, continued
 
<TABLE>
<S>                                                                        <C>
STATEMENT OF OPERATIONS
For the six months ended April 30, 1996 (unaudited)
NET INVESTMENT INCOME:
INTEREST INCOME........................................................    $ 6,949,452
                                                                           -----------
EXPENSES
Investment management fee..............................................        435,871
Auction commission fees................................................         81,119
Professional fees......................................................         56,216
Transfer agent fees and expenses.......................................         33,125
Auction agent fees.....................................................         18,140
Trustees' fees and expenses............................................         16,158
Shareholder reports and notices........................................         14,669
Registration fees......................................................         11,513
Custodian fees.........................................................          6,393
Organizational expenses................................................          3,589
Other..................................................................         18,003
                                                                           -----------
    TOTAL EXPENSES BEFORE EXPENSE OFFSET...............................        694,796
    LESS: EXPENSE OFFSET...............................................         (6,297)
                                                                           -----------
    TOTAL EXPENSES AFTER EXPENSE OFFSET................................        688,499
                                                                           -----------
    NET INVESTMENT INCOME..............................................      6,260,953
                                                                           -----------
NET REALIZED AND UNREALIZED LOSS:
Net realized loss......................................................       (169,242)
Net change in unrealized depreciation..................................     (6,704,129)
                                                                           -----------
    NET LOSS...........................................................     (6,873,371)
                                                                           -----------
NET DECREASE...........................................................    $  (612,418)
                                                                           ===========
</TABLE>
 
        SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>   10
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
FINANCIAL STATEMENTS, continued
 
<TABLE>
<CAPTION>
STATEMENT OF CHANGES IN NET ASSETS
<S>                                                  <C>                   <C>
                                                                           FOR THE YEAR
                                                        FOR THE SIX            ENDED
                                                       MONTHS ENDED         OCTOBER 31,
                                                      APRIL 30, 1996           1995
- ---------------------------------------------------------------------------------------
                                                        (unaudited)
INCREASE (DECREASE) IN NET ASSETS:
OPERATIONS:
Net investment income............................      $   6,260,953       $ 12,794,955
Net realized loss................................           (169,242)        (1,937,406)
Net change in unrealized depreciation............         (6,704,129)        31,391,341
                                                        ------------       ------------
    NET INCREASE (DECREASE)......................           (612,418)        42,248,890
                                                        ------------       ------------
DIVIDENDS FROM NET INVESTMENT INCOME:                                                  
Preferred........................................         (1,174,897)        (2,483,266)
Common...........................................         (4,898,854)       (10,726,273)
                                                        ------------       ------------
    TOTAL........................................         (6,073,751)       (13,209,539)
                                                        ------------       ------------
TRANSACTIONS IN SHARES OF BENEFICIAL INTEREST:                                         
Preferred........................................          --               (19,750,000)
Common...........................................         (3,386,642)        (3,733,282)
                                                        ------------       ------------
    TOTAL........................................         (3,386,642)       (23,483,282)
                                                        ------------       ------------
    TOTAL INCREASE (DECREASE)....................        (10,072,811)         5,556,069
NET ASSETS:
Beginning of period..............................        249,232,443        243,676,374
                                                        ------------       ------------
    END OF PERIOD
    (Including undistributed net investment
    income of $742,183 and $554,981,
    respectively)................................      $ 239,159,632       $249,232,443
                                                        ============       ============
</TABLE>
 
        SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>   11
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
NOTES TO FINANCIAL STATEMENTS April 30, 1996 (unaudited)
 
1. ORGANIZATION AND ACCOUNTING POLICIES
 
InterCapital California Insured Municipal Income Trust (the "Trust") is
registered under the Investment Company Act of 1940, as amended, as a
non-diversified, closed-end management investment company. The Trust was
organized as a Massachusetts business trust on November 2, 1992 and commenced
operations on February 26, 1993.
 
The following is a summary of significant accounting policies:
 
A. VALUATION OF INVESTMENTS -- Portfolio securities are valued by an outside
independent pricing service approved by the Trustees. The pricing service has
informed the Trust that in valuing the portfolio securities, it uses both a
computerized matrix of tax-exempt securities and evaluations by its staff, in
each case based on information concerning market transactions and quotations
from dealers which reflect the bid side of the market each day. The portfolio
securities are thus valued by reference to a combination of transactions and
quotations for the same or other securities believed to be comparable in
quality, coupon, maturity, type of issue, call provisions, trading
characteristics and other features deemed to be relevant. Short-term debt
securities having a maturity date of more than sixty days at time of purchase
are valued on a mark-to-market basis until sixty days prior to maturity and
thereafter at amortized cost based on their value on the 61st day. Short-term
debt securities having a maturity date of sixty days or less at the time of
purchase are valued at amortized cost.
 
B. ACCOUNTING FOR INVESTMENTS -- Security transactions are accounted for on the
trade date (date the order to buy or sell is executed). Realized gains and
losses on security transactions are determined by the identified cost method.
The Trust amortizes premiums and accretes discounts over the life of the
respective securities. Interest income is accrued daily.
 
C. FEDERAL INCOME TAX STATUS -- It is the Trust's policy to comply with the
requirements of the Internal Revenue Code applicable to regulated investment
companies and to distribute all of its taxable and nontaxable income to its
shareholders. Accordingly, no federal income tax provision is required.
 
D. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Trust records dividends
and distributions to its shareholders on the ex-dividend date. The amount of
dividends and distributions from net investment income and net realized capital
gains are determined in accordance with federal income tax regulations which may
differ from generally accepted accounting principles. These "book/tax"
differences are either considered temporary or permanent in nature. To the
extent these differences are permanent in nature, such amounts are reclassified
within the capital accounts based on their federal tax-basis treatment;
temporary differences do not require reclassification. Dividends and
<PAGE>   12
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
NOTES TO FINANCIAL STATEMENTS April 30, 1996 (unaudited) continued
 
distributions which exceed net investment income and net realized capital gains
for financial reporting purposes but not for tax purposes are reported as
dividends in excess of net investment income or distributions in excess of net
realized capital gains. To the extent they exceed net investment income and net
realized capital gains for tax purposes, they are reported as distributions of
paid-in-capital.
 
E. ORGANIZATIONAL EXPENSES -- Dean Witter InterCapital Inc. (the "Investment
Manager") paid the organizational expenses of the Trust's common shares in the
amount of $36,000 which have been reimbursed for the full amount thereof. Such
expenses have been deferred and are being amortized by the straight-line method
over a period not to exceed five years from the commencement of operations.
 
2. INVESTMENT MANAGEMENT AGREEMENT
 
Pursuant to an Investment Management Agreement, the Trust pays a management fee,
calculated weekly and payable monthly, by applying the annual rate of 0.35% to
the Trust's weekly net assets.
 
Under the terms of the Agreement, in addition to managing the Trust's
investments, the Investment Manager maintains certain of the Trust's books and
records and furnishes, at its own expense, office space, facilities, equipment,
clerical, bookkeeping and certain legal services and pays the salaries of all
personnel, including officers of the Trust who are employees of the Investment
Manager. The Investment Manager also bears the cost of telephone services, heat,
light, power and other utilities provided to the Trust.
 
3. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES
 
The cost of purchases and proceeds from sales of portfolio securities, excluding
short-term investments, for the six months ended April 30, 1996 aggregated
$3,000,000 and $5,822,736, respectively.
 
Dean Witter Trust Company, an affiliate of the Investment Manager, is the
Trust's transfer agent. At April 30, 1996, the Trust had transfer agent fees and
expenses payable of approximately $4,400.
 
The Trust has an unfunded noncontributory defined benefit pension plan covering
all independent Trustees of the Trust who will have served as independent
Trustees for at least five years at the time of retirement. Benefits under this
plan are based on years of service and compensation during the last five years
of service. Aggregate pension costs for the six months ended April 30, 1996
included in Trustees' fees and expenses in the Statement of Operations amounted
to $7,921. At April 30, 1996, the Trust had an accrued pension liability of
$24,463 which is included in accrued expenses in the Statement of Assets and
Liabilities.
<PAGE>   13
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
NOTES TO FINANCIAL STATEMENTS April 30, 1996 (unaudited) continued
 
4. PREFERRED SHARES OF BENEFICIAL INTEREST
 
The Trust is authorized to issue up to 1,000,000 non-participating preferred
shares of beneficial interest having a par value of $.01 per share, in one or
more series, with rights as determined by the Trustees, without approval of the
common shareholders. On April 15, 1993, the Trust issued 2,000 shares of Auction
Rate Preferred Shares ("Preferred Shares") consisting of 500 shares each of
Series 1 through 4 for gross total proceeds of $100,000,000. The preferred
shares have a liquidation value of $50,000 per share plus the redemption
premium, if any, plus accumulated but unpaid dividends, whether or not declared,
thereon to the date of distribution. The Trust may redeem such shares, in whole
or in part, at the original purchase price of $50,000 per share plus accumulated
but unpaid dividends, whether or not declared, thereon to the date of
redemption.
 
Dividends, which are cumulative, are reset through auction procedures.
 
<TABLE>
<CAPTION>
                                   RESET          RANGE OF
SHARES*     SERIES     RATE*       DATE       DIVIDEND RATES**
- --------    ------     -----     ---------    ----------------
<S>         <C>        <C>       <C>          <C>
  200         1        3.375%    05/03/96     2.50% - 3.982%
  400         2        3.40      05/03/96     3.19  - 5.00
  500         3        3.375     05/03/96     3.14  - 5.00
  200         4        3.375     05/03/96     2.20  - 5.00
</TABLE>
 
- ---------------------
 *  As of April 30, 1996.
** For the six months ended April 30, 1996.
 
Subsequent to April 30, 1996 and up through June 5, 1996, the Trust paid
dividends to Series 1 through 4 at rates ranging from 3.00% to 3.75%,
respectively, in the aggregate amount of $213,625.
 
The Trust is subject to certain restrictions relating to the preferred shares.
Failure to comply with these restrictions could preclude the Trust from
declaring any distributions to common shareholders or purchasing common shares
and/or could trigger the mandatory redemption of preferred shares at liquidation
value.
 
The preferred shares, which are entitled to one vote per share, generally vote
with the common shares but vote separately as a class to elect two Trustees and
on any matters affecting the rights of the preferred shares.
<PAGE>   14
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
NOTES TO FINANCIAL STATEMENTS April 30, 1996 (unaudited) continued
 
5. COMMON SHARES OF BENEFICIAL INTEREST
 
Transactions in common shares of beneficial interest were as follows:
 
<TABLE>
<CAPTION>
                                                                                                                   CAPITAL
                                                                                                                   PAID IN
                                                                                                                  EXCESS OF
                                                                                     SHARES       PAR VALUE       PAR VALUE
                                                                                   ----------     ----------     ------------
<S>                                                                                <C>            <C>            <C>
Balance, October 31, 1994......................................................    14,082,613      $140,826      $195,643,714
Treasury shares purchased and retired (weighted average discount 8.92%)*.......      (332,600)       (3,326)       (3,729,956)
                                                                                   ----------      --------      ------------
Balance, October 31, 1995......................................................    13,750,013       137,500       191,913,758
Treasury shares purchased and retired (weighted average discount 12.79%)*......      (285,900)       (2,859)       (3,383,783)
                                                                                   ----------      --------      ------------
Balance, April 30, 1996........................................................    13,464,113      $134,641      $188,529,975
                                                                                   ==========      ========      ============
</TABLE>
 
- ---------------------
* The Trustees have voted to retire the shares purchased.
 
6. FEDERAL INCOME TAX STATUS
 
At October 31, 1995, the Trust had a net capital loss carryover of approximately
$6,733,000 of which $4,795,000 will be available through October 31, 2002 and
$1,938,000 will be available through October 31, 2003 to offset future capital
gains to the extent provided by regulations.
 
7. DIVIDENDS TO COMMON SHAREHOLDERS
 
The Trust declared the following dividends from net investment income:
 
<TABLE>
<CAPTION>
  DECLARATION       AMOUNT          RECORD           PAYABLE
     DATE          PER SHARE         DATE              DATE
- ---------------    ---------     -------------    --------------
<S>                <C>           <C>              <C>
April 23, 1996       $0.06       May 3, 1996      May 17, 1996
May 28, 1996         $0.06       June 7, 1996     June 21, 1996
</TABLE>
<PAGE>   15
 
INTERCAPITAL CALIFORNIA INSURED MUNICIPAL INCOME TRUST
FINANCIAL HIGHLIGHTS
 
Selected ratios and per share data for a common share of beneficial interest
outstanding throughout each period:
 
<TABLE>
<CAPTION>
                                                                                                
                                                                                    FOR THE YEAR
                                                         FOR THE SIX                   ENDED                    FOR THE PERIOD
                                                         MONTHS ENDED               OCTOBER 31**              FEBRUARY 26, 1993*
                                                          APRIL 30,             --------------------                THROUGH
                                                            1996**            1995                1994        OCTOBER 31, 1993**
- --------------------------------------------------------------------------------------------------------------------------------
                                                         (unaudited)
<S>                                                      <C>              <C>                 <C>             <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period.................        $13.40             $11.29             $ 14.87           $ 14.06
                                                             ------             ------             -------           -------
Net investment income................................          0.46               0.92                1.07              0.62
Net realized and unrealized gain (loss)..............         (0.51)              2.14               (3.57)             0.89
                                                             ------             ------             -------           -------
Total from investment operations.....................         (0.05)              3.06               (2.50)             1.51
                                                             ------             ------             -------           -------
Less dividends and distributions from:
   Net investment income.............................         (0.36)             (0.77)              (0.87)            (0.43)
   Common share equivalent of dividends paid to
    preferred shareholders...........................         (0.09)             (0.18)              (0.20)            (0.11)
   Net realized gain.................................            --                 --               (0.01)               --
                                                             ------             ------             -------           -------
Total dividends and distributions....................         (0.45)             (0.95)              (1.08)            (0.54)
Anti-dilutive effect of acquiring treasury shares....          0.04                 --                  --                --
Offering costs charged against capital...............            --                 --                  --             (0.16)
                                                             ------             ------             -------           -------
Net asset value, end of period.......................        $12.94             $13.40             $ 11.29           $ 14.87
                                                             ======             ======             =======           =======
Market value, end of period..........................        $11.50             $11.75             $11.125           $15.375
                                                             ======             ======             =======           =======
TOTAL INVESTMENT RETURN+.............................          0.88%(1)          12.93%             (22.82)%            5.39%(1)
RATIOS TO AVERAGE NET ASSETS OF COMMON SHAREHOLDERS:
Total expenses before expense offset.................          0.75%(2)(4)        0.81%(3)            0.89%             0.73%(2)
Net investment income before preferred stock
 dividends...........................................          6.80%(2)           7.39%(3)            8.12%             6.39%(2)
Preferred stock dividends............................          1.28%(2)           1.44%               1.54%             1.11%(2)
Net investment income available to common
 shareholders........................................          5.52%(2)           5.95%               6.58%             5.28%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands..............      $239,160           $249,232            $243,676          $309,759
Asset coverage on preferred shares at end of
 period..............................................           368%               383%                287%              309%
Portfolio turnover rate..............................             1%(1)              1%                 12%                2%(1)
</TABLE>
 
- ---------------------
  *  Commencement of operations.
 **  The per share amounts were computed using an average number of shares
     outstanding during the period.
  +  Total investment return is based upon the current market value on the last
     day of each period reported. Dividends and distributions are assumed to be
     reinvested at the prices obtained under the Trust's dividend reinvestment
     plan. Total investment return does not reflect brokerage commissions.
(1)  Not annualized.
(2)  Annualized.
(3)  The above expense and net investment income ratios would have been 0.80%
     and 7.40%, respectively, which reflects 0.01% effect for custody cash
     credits.
(4)  The above annualized expense ratio would have been 0.75% after expense
     offset.
 
                       SEE NOTES TO FINANCIAL STATEMENTS
<PAGE>   16

TRUSTEES        
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Paul Kolton
Michael E. Nugent
Philip J. Purcell
John L. Schroeder

OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive Officer

Sheldon Curtis
Vice President, Secretary and General Counsel

James F. Willison
Vice President

Thomas F. Caloia
Treasurer

TRANSFER AGENT
Dean Witter Trust Company
Harborside Financial Center - Plaza Two
Jersey City, New Jersey 07311

INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York  10036

INVESTMENT MANAGER
Dean Witter InterCapital Inc.
Two World Trade Center
New York, New York  10048



The financial statements included herein have been taken from the records of
the Trust without examination by the independent accountants and accordingly
they do not express an opinion thereon.


INTERCAPITAL  
CALIFORNIA 
INSURED 
MUNICIPAL 
INCOME 
TRUST
        
SEMIANNUAL REPORT
APRIL 30, 1996


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