As filed with the Securities and Exchange Commission on December 1, 2005
                                     Investment Company Act file number 811-8312


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                   FORM N-CSR
                         CERTIFIED SHAREHOLDER REPORT OF
                   REGISTERED MANAGEMENT INVESTMENT COMPANIES


                         INSTITUTIONAL DAILY INCOME FUND
               (Exact name of registrant as specified in charter)


                                600 FIFTH AVENUE
                               NEW YORK, NY 10020
               (Address of principal executive offices) (Zip code)


                                 ROSANNE HOLTZER
                     C/O REICH & TANG ASSET MANAGEMENT, LLC
                                600 FIFTH AVENUE
                            NEW YORK, NEW YORK 10020
                     (Name and address of agent for service)


Registrant's telephone number, including area code: 212-830-5200

Date of fiscal year end:   March 31

Date of reporting period:  September 30, 2005


ITEM 1: REPORT TO STOCKHOLDERS

- --------------------------------------------------------------------------------
INSTITUTIONAL                               600 FIFTH AVENUE, NEW YORK, NY 10020
DAILY INCOME FUND                                                 (212) 830-5200

================================================================================


Dear Shareholder:

We are pleased to present the semi-annual  report of Institutional  Daily Income
Fund (the "Fund") for the period ended April 1, 2005 through September 30, 2005.

The  Fund's  Money  Market  Portfolio  had 915  shareholders  and net  assets of
$676,583,292  as of September  30, 2005.  The U.S.  Treasury  Portfolio  had 183
shareholders and net assets of $795,730,827 as of September 30, 2005.

We thank you for your support and look forward to continuing to serve your cash
management needs.



Sincerely,
/s/ signature




Steven W. Duff
President














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

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
EXPENSE CHART
FOR THE SIX MONTHS ENDED SEPTEMBER 30, 2005
(UNAUDITED)
================================================================================
As a shareholder of the Fund, you incur the following ongoing costs:  management
fees and other Fund  expenses.  You may also incur  distribution  and/or service
(12b-1) fees. This example is intended to help you understand your ongoing costs
(in  dollars)  of  investing  in the Fund and to  compare  these  costs with the
ongoing costs of investing in other mutual funds.

The Example is based on an investment of $1,000 invested at the beginning of the
period and held for the entire period April 1, 2005 through September 30, 2005.

ACTUAL EXPENSES

The first line of the table below  provides  information  about  actual  account
values and actual expenses.  You may use information in this line, together with
the amount you invested, to estimate the expenses that you paid over the period.
Simply divide your account value by $1,000 (for example, an $8,600 account value
divided by $1,000 = 8.6),  then  multiply  the result by the number in the first
line under the heading  entitled  "Expenses  Paid During the Period" to estimate
the expenses you paid on your account during this period.

HYPOTHETICAL EXAMPLE FOR COMPARISON PURPOSES

The second  line of the table  below  provides  information  about  hypothetical
account  values and  hypothetical  expenses  based on the Fund's actual  expense
ratio and an assumed rate of return of 5% per year before expenses, which is not
the Fund's actual return.  The hypothetical  account values and expenses may not
be used to estimate the actual ending  account  balance or expenses you paid for
the  period.  You may use this  information  to  compare  the  ongoing  costs of
investing in the Fund and other funds.  To do so,  compare this 5%  hypothetical
example with the 5% hypothetical examples that appear in the shareholder reports
of the other funds.

Please note that the  expenses  shown in the table are meant to  highlight  your
ongoing  costs only and do not reflect any  transactional  costs,  such as sales
charges  (loads),  redemption fees, or exchange fees that you may incur in other
mutual  funds.  Therefore,  the second line of the table is useful in  comparing
ongoing costs only,  and will not help you determine the relative total costs of
owning different funds.












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



================================================================================



- ----------------------------------------------------------------------------------------------------------------------
       Money Market Portfolio
- ----------------------------------------------------------------------------------------------------------------------
                                                                                  
                                     Beginning Account Value     Ending Account Value      Expenses Paid During the
               Class A                       04/1/05                   09/30/05                    Period*
- ----------------------------------------------------------------------------------------------------------------------
  Actual                                    $1,000.00                 $1,014.00                     $2.37
- ----------------------------------------------------------------------------------------------------------------------
  Hypothetical (5% return before            $1,000.00                 $1,022.71                     $2.38
  expenses)
- ----------------------------------------------------------------------------------------------------------------------

- ----------------------------------------------------------------------------------------------------------------------
                                     Beginning Account Value     Ending Account Value      Expenses Paid During the
      Class B & Pinnacle Shares              04/1/05                   09/30/05                    Period*
- ----------------------------------------------------------------------------------------------------------------------
  Actual                                    $1,000.00                 $1,015.30                     $1.01
- ----------------------------------------------------------------------------------------------------------------------
  Hypothetical (5% return before            $1,000.00                 $1,024.07                     $1.01
  expenses)
- ----------------------------------------------------------------------------------------------------------------------

- ----------------------------------------------------------------------------------------------------------------------
       U.S. Treasury Portfolio
- ----------------------------------------------------------------------------------------------------------------------
                                     Beginning Account Value     Ending Account Value      Expenses Paid During the
               Class A                       04/1/05                   09/30/05                    Period*
- ----------------------------------------------------------------------------------------------------------------------
  Actual                                    $1,000.00                 $1,013.50                    $2.27
- ----------------------------------------------------------------------------------------------------------------------
  Hypothetical (5% return before            $1,000.00                 $1,022.81                    $2.28
  expenses)
- ----------------------------------------------------------------------------------------------------------------------

- ----------------------------------------------------------------------------------------------------------------------
                                     Beginning Account Value     Ending Account Value      Expenses Paid During the
      Class B & Pinnacle Shares              04/1/05                   09/30/05                    Period*
- ----------------------------------------------------------------------------------------------------------------------
  Actual                                    $1,000.00                 $1,014.80                    $1.01
- ----------------------------------------------------------------------------------------------------------------------
  Hypothetical (5% return before            $1,000.00                 $1,024.07                    $1.01
  expenses)
- ----------------------------------------------------------------------------------------------------------------------

<FN>
*    Expenses are equal to the Fund's annualized expense ratios of 0.47%, 0.20%,
     and 0.20%,  for the Money Market  Portfolio  Class A, Class B, and Pinnacle
     shares,  respectively  and 0.45%,  0.20%,  and 0.20% for the U.S.  Treasury
     Portfolio Class A, Class B, and Pinnacle shares,  respectively,  multiplied
     by the  average  account  value  over the  period  (April 1,  2005  through
     September  30,  2005),  multiplied  by 183/365  (to reflect the most recent
     fiscal half-year).
</FN>





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

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS
SEPTEMBER 30, 2005
(UNAUDITED)
================================================================================


    Face                                                                        Maturity                    Value
    Amount                                                                        Date        Yield        (Note 1)
    ------                                                                        ----        -----         ------
Asset Back Commercial Paper (30.98%)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                           
$  20,000,000   Charta LLC                                                      10/18/05      3.68%    $  19,965,433
   10,000,000   Charta LLC                                                      11/09/05      3.83         9,958,725
   25,000,000   Clipper Receivables Corporation                                 10/03/05      3.85        24,994,653
   15,000,000   Galaxy Funding Incorporated                                     10/14/05      3.55        14,980,933
   20,000,000   Govco Incorporated                                              10/14/05      3.63        19,973,928
   10,000,000   Greyhawk Funding                                                10/24/05      3.76         9,976,042
   10,000,000   Greyhawk Funding                                                10/28/05      3.77         9,971,800
   15,000,000   Lexington Parker Capital                                        10/17/05      3.76        14,975,000
   15,000,000   Lexington Parker Capital                                        10/18/05      3.55        14,975,067
   15,000,000   Lockhart Funding LLC                                            10/28/05      3.80        14,957,362
   25,000,000   Market Street Funding                                           10/20/05      3.71        24,951,180
   10,000,000   Scaldis Capital LLC                                             10/12/05      3.51         9,989,367
   20,000,000   Windmill Funding Corporation                                    10/19/05      3.73        19,962,800
- -------------                                                                                          -------------
  210,000,000   Total Asset Back Commercial Paper                                                        209,632,290
- -------------                                                                                          -------------

Commercial Paper (4.43%)
- ------------------------------------------------------------------------------------------------------------------------------------
$  30,000,000   Canadian Imperial Holdings Inc.                                 10/12/05      3.65%    $  29,966,633
- -------------                                                                                          -------------
   30,000,000   Total Commercial Paper                                                                    29,966,633
- -------------                                                                                          -------------

Domestic Certificate of Deposit (4.43%)
- ------------------------------------------------------------------------------------------------------------------------------------
$  15,000,000   Harris Trust & Savings Bank                                     02/02/06      3.81%    $  15,000,638
   15,000,000   Wilmington Trust                                                11/03/05      3.72        15,000,132
- -------------                                                                                          -------------
   30,000,000   Total Domestic Certificate of Deposit                                                     30,000,770
- -------------                                                                                          -------------

Floating Rate Securities (3.70%)
- ------------------------------------------------------------------------------------------------------------------------------------
$  10,000,000   Bank of America Prime Floater (a)                               12/15/05      3.81%    $  10,000,000
    5,000,000   Caterpillar Financial Services Corporation (b)                  07/10/06      3.67         5,000,000
   10,000,000   Merrill Lynch Extendible Monthly Securities (c)                 11/15/06      3.75        10,000,000
- -------------                                                                                          -------------
   25,000,000   Total Floating Rate Securities                                                            25,000,000
- -------------                                                                                          -------------

Foreign Commercial Paper (8.84%)
- ------------------------------------------------------------------------------------------------------------------------------------
$   5,000,000   Alliance & Leicester PLC                                        10/07/05      3.51%    $   4,997,104
   20,000,000   Northern Rock PLC                                               10/12/05      3.50        19,978,795
   10,000,000   Societe Generale North America                                  12/19/05      3.86         9,916,063



- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

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




================================================================================


    Face                                                                        Maturity                    Value
    Amount                                                                        Date        Yield        (Note 1)
    ------                                                                        ----        -----         ------
Foreign Commercial Paper (Continued)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                           
$  25,000,000   Yorkshire Building Society                                      11/07/05      3.71%    $  24,905,187
- -------------                                                                                          -------------
   60,000,000   Total Foreign Commercial Paper                                                            59,797,149
- -------------                                                                                          -------------

Letter of Credit Commercial Paper (1.18%)
- ------------------------------------------------------------------------------------------------------------------------------------
$   8,000,000   Dean Health System Inc.
                LOC Marshall & Ilsley                                           10/03/05      3.60%    $   7,998,409
- -------------                                                                                          -------------
    8,000,000   Total Letter of Credit Commercial Paper                                                    7,998,409
- -------------                                                                                          -------------

Loan Participation (2.96%)
- ------------------------------------------------------------------------------------------------------------------------------------
$  15,000,000   AXA Equitable Life Insurance Company
                with J.P. Morgan Chase (d)                                      03/21/06      3.83%    $   15,000,000
    5,000,000   Mt. Vernon Phenol (General Electrics Co.) with
                J.P. Morgan Chase (d)                                           05/19/06      3.81          5,000,000
- -------------                                                                                          --------------
   20,000,000   Total Loan Participation                                                                   20,000,000
- -------------                                                                                          --------------

Other Notes (0.52%)
- ------------------------------------------------------------------------------------------------------------------------------------
$   3,508,500   Ulster County, NY BAN - Series 2004B                            11/18/05      3.25%    $    3,509,620
- -------------                                                                                          --------------
    3,508,500   Total Other Notes                                                                           3,509,620
- -------------                                                                                          --------------

Repurchase Agreement (13.45%)
- ------------------------------------------------------------------------------------------------------------------------------------
$  91,000,000   JP Morgan Securities Inc., purchased on 09/30/05, repurchase
                proceeds at maturity $91,027,679 (Collateralized by
                $138,611,923, GNMA, 4.125% to 7.500%, due 01/15/07 to 01/15/47,
                value $92,822,010)                                              10/03/05      3.65%    $   91,000,000
- -------------                                                                                          --------------
   91,000,000   Total Repurchase Agreement                                                                 91,000,000
- -------------                                                                                          --------------

Variable Rate Demand Instruments (e) (10.62%)
- ------------------------------------------------------------------------------------------------------------------------------------
$   1,435,000   American Micro Products
                LOC U.S. Bank, N.A.                                             10/01/08      3.91%    $    1,435,000
    2,325,000   Atlas Metal Investment Corporation
                LOC Fifth Third Bank                                            10/01/20      3.84          2,325,000
      635,000   Automated Packaging Systems
                LOC National City Bank of Michigan/Illinois                     10/01/08      3.93            635,000
      970,000   Big Brothers Big Sisters
                LOC Fifth Third Bank                                            12/01/20      3.84            970,000
    2,820,000   Briarwood Investments, LLC
                Collateralized by Federal Home Loan Bank of Cincinnati          04/01/23      3.88           2,820,000
    5,600,000   CFM International Inc. Guaranteed Notes - Series 1999A (f)
                LOC General Electric Company                                    01/01/10      3.84           5,600,000


- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS (CONTINUED)
SEPTEMBER 30, 2005
(UNAUDITED)
================================================================================


    Face                                                                        Maturity                    Value
    Amount                                                                        Date        Yield        (Note 1)
    ------                                                                        ----        -----         ------
Variable Rate Demand Instruments (e) (Continued)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                           
$   1,400,000   CJ Krehbiel Co.
                LOC Fifth Third Bank                                            10/01/10      3.84%    $    1,400,000
      250,000   Colorado Springs, CO Adjustable Rate Taxable/Convertible Bonds
                (Goodwill Industries Project) - Series 1997B
                LOC Bank One                                                    02/01/07      3.89            250,000
    2,325,000   D.E.D.E. Realty
                LOC Fifth Third Bank                                            12/01/11      3.84          2,325,000
    2,105,000   Delta Capital LLC - Series 1996B
                LOC Bank One                                                    10/01/26      3.94          2,105,000
      980,000   Dickenson Press, Inc. - Series 1997
                LOC Huntington National Bank                                    01/01/27      3.94            980,000
    2,370,000   Erie County, NY IDA RB (Niagara-Maryland LLC Project)
                - Series 2003 LOC Manufacturers and Traders Trust Co.           06/01/23      3.92          2,370,000
    2,885,000   Ewing Enterprise
                LOC US Bank, N.A.                                               06/01/25      3.86          2,885,000
    2,750,000   Fiore Capital LLC
                LOC Marshall & Ilsley                                           08/01/45      3.84          2,750,000
    1,105,000   First Metropolitan Title Company
                LOC LaSalle National Bank subsidiary of ABN Amro Bank, N.A.     05/01/24      3.94          1,105,000
    1,580,000   Frank J. Catanzaro Sons and Daughters
                LOC U.S. Bank, N.A.                                             01/01/15      3.86          1,580,000
    2,780,000   Governor's Village LLC
                LOC Fifth Third Bank                                            03/01/20      3.84          2,780,000
    1,365,000   Joe Holland Chevrolet
                LOC Fifth Third Bank                                            07/01/24      3.84          1,365,000
      210,000   JRB Corporation
                LOC Old Kent Bank & Trust Co.                                   07/01/26      3.94            210,000
    1,300,000   Kissel Holdings LLC
                LOC U.S. Bank, N.A.                                             12/01/20      3.86          1,300,000
    4,800,000   Lake Mary Bay Limited Partnership
                LOC Amsouth Bank, N.A.                                          03/01/25      3.94          4,800,000
    3,100,000   Landmark Church of Christ
                LOC Columbus Bank & Trust Company                               04/01/20      3.88          3,100,000



- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

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



================================================================================


    Face                                                                        Maturity                    Value
    Amount                                                                        Date        Yield        (Note 1)
    ------                                                                        ----        -----         ------
Variable Rate Demand Instruments (e) (Continued)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                           
$   2,075,000   Lee County, FL HFA
                Guaranteed by Federal National Mortgage Association             05/15/35      3.84%    $    2,075,000
    1,900,000   Lauren Company, LLC - Series 2003
                LOC Wells Fargo Bank, N.A.                                      07/01/33      3.88          1,900,000
      490,000   LRV Enterprises, LLC
                LOC National City Bank                                          09/01/21      4.00            490,000
    1,200,000   Mayfair Village Retirement Center, Inc., KY
                (Variable Rate Term Notes) - Series 1995
                LOC PNC Bank, N.A.                                              05/15/09      3.84          1,200,000
    3,650,000   Mississippi Business Finance Corporation IDRB
                (ABT Co., Inc. Project) - Series 1997B
                LOC Wachovia Bank, N.A.                                         04/01/22      3.91          3,650,000
      730,000   Mississippi Business Finance Corporation IDRB
                (Howard Industries Inc. Project)
                LOC Amsouth Bank, N.A.                                          06/01/10      3.88            730,000
    2,400,000   Mt. Carmel West Medical Office Building
                LOC National City Bank                                          08/01/19      3.90          2,400,000
    5,000,000   St. Johns County IDA
                LOC Allied Irish Bank                                           08/01/34      3.84          5,000,000
    1,600,000   Trendway Corporation
                LOC Michigan National Bank                                      12/01/26      3.94          1,600,000
    4,072,000   Washington State HFC Non-Profit Housing RB
                (Rockwood Program) - Series B (g)
                LOC Wells Fargo Bank, N.A.                                      01/01/30      3.87          4,072,000
    2,010,000   Wholesome Group
                LOC Fifth Third Bank                                            10/01/20      3.84          2,010,000
    1,650,000   Wisconsin Housing Preservation Corporation
                LOC Marshall & Ilsley                                           05/01/35      3.84          1,650,000
- -------------                                                                                          --------------
   71,867,000   Total Variable Rate Demand Instruments                                                     71,867,000
- -------------                                                                                          --------------

Yankee Certificate of Deposit (19.21%)
- ------------------------------------------------------------------------------------------------------------------------------------
$  20,000,000   Banco Bilbao de Vizcaya                                         10/17/05      3.63%    $   20,000,044
   10,000,000   Barclays Bank                                                   11/08/05      3.70         10,000,000
   20,000,000   Calyon                                                          10/17/05      3.62         20,000,044
   25,000,000   Credit Suisse First Boston                                      11/14/05      3.74         25,000,152


- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS (CONTINUED)
SEPTEMBER 30, 2005
(UNAUDITED)
================================================================================


    Face                                                                        Maturity                    Value
    Amount                                                                        Date        Yield        (Note 1)
    ------                                                                        ----        -----         ------
Yankee Certificate of Deposit (Continued)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                           
$  25,000,000   HSH Nordbank AG                                                 10/27/05      3.80%    $   25,000,090
   20,000,000   Societe Generale                                                11/28/05      3.80         20,000,000
   10,000,000   Svenska Handelsbanken                                           10/12/05      3.61         10,000,015
- -------------                                                                                          --------------
  130,000,000   Total Yankee Certificate of Deposit                                                       130,000,345
- -------------                                                                                          --------------
                Total Investments (100.32%) (cost $678,772,216+)                                          678,772,216
                Liabilities in excess of cash and other assets, (-0.32%)                                   (2,188,924)
                                                                                                       --------------
                Net Assets (100.00%)                                                                   $  676,583,292
                                                                                                       ==============

<FN>
                + Aggregate cost for federal income tax purposes is identical.
</FN>


FOOTNOTES:

(a) The interest rate is adjusted daily based upon Prime minus 2.935%.
(b) The interest rate is adjusted quarterly based upon three month LIBOR plus
    0.12%.
(c) The interest is adjusted monthly based upon one month LIBOR minus 0.02%.
(d) Loan participation agreement with the interest rate adjusted monthly based
    upon one month LIBOR plus 0.02%.
(e) Securities payable on demand at par including accrued interest (with seven
    days' notice). Interest rate is adjusted weekly.
(f) The interest rate is adjusted weekly based upon average of prior week one
    month LIBOR plus 0.05%; weekly put at par.
(g) Securities payable on demand at par including accrued interest (with one day
    notice). Interest rate is adjusted daily.



KEY:

                                                         
   BAN     =   Bond Anticipation Note                       IDA     =   Industrial Development Authority
   GNMA    =   Government National Mortgage Association     IDRB    =   Industrial Development Revenue Bond
   GO      =   General Obligation                           LOC     =   Letter of Credit
   HFA     =   Housing Finance Authority                    RB      =   Revenue Bond
   HFC     =   Housing Finance Commission






- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
MONEY MARKET PORTFOLIO
BREAKDOWN OF PORTFOLIO HOLDINGS
SEPTEMBER 30, 2005
(UNAUDITED)
================================================================================

BREAKDOWN OF PORTFOLIO HOLDINGS BY MATURITY


- ----------------------------------------------------------------------------------
    Securities Maturing in               Value                % of Portfolio
- ----------------------------------------------------------------------------------
                                                             
  Less than 31 Days                 $  555,482,338                 81.84%
  31 through 60 Days                   108,373,815                 15.96
  61 through 90 Days                    14,916,063                  2.20
  91 through 120 Days                           --                  0.00
  121 through 180 Days                          --                  0.00
  Over 180 Days                                 --                  0.00
- ----------------------------------------------------------------------------------
  Total                             $  678,772,216                100.00%
- ----------------------------------------------------------------------------------
























- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
U.S. TREASURY PORTFOLIO
SCHEDULE OF INVESTMENTS
SEPTEMBER 30, 2005
(UNAUDITED)
================================================================================


    Face                                                                        Maturity                    Value
    Amount                                                                        Date        Yield        (Note 1)
    ------                                                                        ----        -----         ------
Repurchase Agreements (49.26%)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                           
$  83,000,000   Bank of America, purchased on 09/30/05, repurchase proceeds at
                maturity $83,022,479 (Collateralized by $82,902,000,
                U.S. Treasury Note, 4.625%, due 05/15/06, value $84,660,662)    10/03/05      3.25%    $   83,000,000
  150,000,000   Bear, Stearns & Co., purchased on 09/30/05, repurchase proceeds at
                maturity $150,047,250 (Collateralized by $243,138,020, GNMA 4.000%
                to 8.500%, due 03/15/18 to 07/20/34, value $153,000,842)        10/03/05      3.78        150,000,000
   84,000,000   JP Morgan Securities, Inc., purchased on 09/30/05, repurchase
                proceeds at maturity $84,022,400 (Collateralized by $85,550,000,
                U.S. Treasury Note, 4.000%, due 11/15/12, value $85,680,039)    10/03/05      3.20         84,000,000
   75,000,000   UBS Paine Webber, purchased on 09/30/05, repurchase proceeds at
                maturity $75,020,938 (Collateralized by $196,184,000,TPRX,
                6.500% to 7.500%, due 11/15/24 to 11/15/26, value $76,501,825)  10/03/05      3.35         75,000,000
- -------------                                                                                          --------------
  392,000,000   Total Repurchase Agreements                                                               392,000,000
- -------------                                                                                          --------------

U.S. Government Obligations (50.69%)
- ------------------------------------------------------------------------------------------------------------------------------------
$ 284,025,000   U.S. Treasury Bill                                              10/06/05      2.50%    $  283,926,380
   30,000,000   U.S. Treasury Bill                                              10/13/05      3.11         29,969,400
   30,000,000   U.S. Treasury Bill                                              11/03/05      3.13         29,915,025
   20,000,000   U.S. Treasury Note, 1.625%                                      02/28/06      3.03         19,887,030
   40,000,000   U.S. Treasury Note, 1.625%                                      02/28/06      3.77         39,651,324
- -------------                                                                                          --------------
  404,025,000   Total U.S. Government Obligations                                                         403,349,159
- -------------                                                                                          --------------
                Total Investments (99.95%) (cost $795,349,159+)                                           795,349,159
                Cash and other assets, net of liabilities (0.05%)                                             381,668
                                                                                                       --------------
                Net Assets (100.00%)                                                                   $  795,730,827
                                                                                                       ==============
<FN>
                + Aggregate cost for federal income tax purposes is identical.
</FN>




KEY:
                                                                 
      GNMA     =   Government National Mortgage Association        TPRX     =   U.S. Treasury Principal Strip








- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
U.S TREASURY PORTFOLIO
BREAKDOWN OF PORTFOLIO HOLDINGS
SEPTEMBER 30, 2005
(UNAUDITED)
================================================================================



BREAKDOWN OF PORTFOLIO HOLDINGS BY MATURITY

- ----------------------------------------------------------------------------------
    Securities Maturing in               Value               % of Portfolio
- ----------------------------------------------------------------------------------
                                                            
  Less than 31 Days                  $  705,895,780               88.75%
  31 through 60 Days                     29,915,025                3.76
  61 through 90 Days                             --                0.00
  91 through 120 Days                            --                0.00
  121 through 180 Days                   59,538,354                7.49
  Over 180 Days                                  --                0.00
- ----------------------------------------------------------------------------------
  Total                              $   759,349,159              100.00%
- ----------------------------------------------------------------------------------
























- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
STATEMENT OF ASSETS AND LIABILITIES
SEPTEMBER 30, 2005
(UNAUDITED)
================================================================================


                                                                          Money Market           U.S. Treasury
                                                                            Portfolio               Portfolio
ASSETS
                                                                                          
   Investments in securities, at amortized cost (Note 1)........        $   587,772,216         $   403,349,159
   Repurchase agreements........................................             91,000,000             392,000,000
   Cash ........................................................                 -0-                  1,277,509
   Accrued interest receivable..................................                986,375                 121,183
   Prepaid expenses.............................................                 19,893                  34,462
   Other receivables............................................                  5,181                   3,089
                                                                        ---------------         ---------------
          Total assets..........................................            679,783,665             796,785,402
                                                                        ---------------         ---------------
LIABILITIES
   Payable to affiliates*.......................................                  2,953                  17,655
   Due to custodian.............................................              2,641,771                   -0-
   Accrued expenses.............................................                206,456                  56,602
   Dividends payable............................................                349,193                 980,318
                                                                        ---------------         ---------------
         Total liabilities......................................              3,200,373               1,054,575
                                                                        ---------------         ---------------
   Net assets...................................................        $   676,583,292         $   795,730,827
                                                                        ===============         ===============
SOURCE OF NET ASSETS
   Net capital paid in on shares of capital stock (Note 3)......        $   676,583,509         $   795,731,034
   Accumulated net realized loss................................                   (217)                   (207)
                                                                        ---------------         ---------------
   Net assets...................................................        $   676,583,292         $   795,730,827
                                                                        ===============         ===============
   Net asset value, per share (Note 3):

   Money Market Portfolio:
     Class A shares, ($187,977,141 applicable to 187,977,201 shares outstanding)                     $     1.00
                                                                                                     ==========
     Class B shares, ($379,498,081 applicable to 379,498,203 shares outstanding)                     $     1.00
                                                                                                     ==========
     Pinnacle shares, ($109,108,070 applicable to 109,108,105 shares outstanding)                    $     1.00
                                                                                                     ==========
   U.S. Government Portfolio:
     Class A shares, ($246,774,901 applicable to 246,774,965 shares outstanding)                     $     1.00
                                                                                                     ==========
     Class B shares, ($514,627,654 applicable to 514,627,788 shares outstanding)                     $     1.00
                                                                                                     ==========
     Pinnacle shares, ($34,328,272 applicable to 34,328,281 shares outstanding)                      $     1.00
                                                                                                     ==========
<FN>
     * Includes fees payable to Reich & Tang Asset Management, LLC, Reich & Tang
       Distributors, Inc. and Reich & Tang Services, Inc.
</FN>


- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
STATEMENTS OF OPERATIONS
SIX MONTHS ENDED SEPTEMBER 30, 2005
(UNAUDITED)
================================================================================


                                                                          Money Market           U.S. Treasury
                                                                            Portfolio               Portfolio
INVESTMENT INCOME
                                                                                          
Income:
   Interest...................................................          $     8,813,704         $    12,248,632
                                                                        ---------------         ---------------
Expenses: (Note 2)
   Investment management fee..................................                  322,755                 470,148
   Administration fee.........................................                  134,481                 195,895
   Shareholder servicing fee (Class A shares).................                  182,065                 345,511
   Custodian expenses.........................................                   17,482                  18,870
   Shareholder servicing and related shareholder expenses+....                  105,665                  94,598
   Legal, compliance and filing fees..........................                  148,885                  88,970
   Audit and accounting.......................................                   79,847                  58,853
   Trustees' fees and expenses................................                    9,020                   7,519
   Other......................................................                   12,082                  18,229
                                                                        ---------------          --------------
      Total expenses..........................................                1,012,282               1,298,593
      Less:  Fees waived (Note 2).............................                 (268,829)               (156,716)
             Expense paid indirectly (Note 2).................                   (8,897)                (12,786)
                                                                        ---------------          --------------
       Net expenses............................................                 734,556               1,129,091
                                                                        ---------------          --------------
Net investment income..........................................               8,079,148              11,119,541

REALIZED GAIN (LOSS) ON INVESTMENTS
Net realized loss on investments...............................                  -0-                        914
                                                                        ---------------          --------------
Increase in net assets from operations.........................         $     8,079,148          $   11,120,455
                                                                        ===============          ==============

<FN>
+  Includes class specific transfer agency expenses of $14,565 for Money Market
   Portfolio Class A and $27,641, $46,971 and $3,746 for U.S. Treasury Portfolio
   Class A, Class B and Pinnacle Shares, respectively.
</FN>




- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
STATEMENTS OF CHANGES IN NET ASSETS

================================================================================


                                                    Money Market Portfolio               U.S. Treasury Portfolio
                                              ----------------------------------     ---------------------------------
                                               Six Months Ended       Year            Six Months Ended       Year
                                              September 30, 2005      Ended          September 30, 2005      Ended
                                                  (Unaudited)     March 31, 2005         (Unaudited)    March 31, 2005
                                                   ---------      --------------          ---------     --------------
INCREASE (DECREASE)
  IN NET ASSETS

                                                                                            
Operations:
Net investment income.......................     $   8,079,148    $    5,815,811      $  11,119,541     $  10,218,410
Net realized gain (loss) on investments.....           -0-                   (59)               914            (1,121)
                                                 -------------    --------------      -------------     -------------
Increase in net assets from operations......         8,079,148         5,815,752         11,120,455        10,217,289
Dividends to shareholders from net investment income:
   Class A shares...........................        (2,034,530)         (987,750)        (3,693,259)       (2,785,634)
   Class B shares...........................        (4,296,320)       (2,915,564)        (6,880,833)       (6,873,383)
   Pinnacle shares..........................        (1,748,298)       (1,912,497)          (545,449)         (559,393)
Capital share transactions (Note 3):
   Class A shares...........................        67,988,601        66,615,672         10,153,545       (25,309,323)
   Class B shares...........................       164,184,121        51,484,724         31,193,056        17,393,717
   Pinnacle shares..........................        (5,684,352)       (8,046,389)        (5,481,264)       10,557,265
                                                 -------------    --------------      -------------     -------------
   Total  increase(decrease)................       226,488,370       110,053,948         35,866,251         2,640,538
Net assets:
   Beginning of period......................       450,094,922       340,040,974        759,864,576       757,224,038
                                                 -------------    --------------      -------------     -------------
   End of period............................     $ 676,583,292    $  450,094,922      $ 795,730,827     $ 759,864,576
                                                 =============    ==============      =============     =============
Undistributed net investment income.........     $     -0-        $      -0-           $    -0-         $     -0-
                                                 =============    ==============      =============     =============











- --------------------------------------------------------------------------------
   The accompanying notes are an integral part of these financial statements.

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
NOTES TO FINANCIAL STATEMENTS
(UNAUDITED)

================================================================================

1. Summary of Accounting Policies
Institutional Daily Income Fund (the "Fund") is a no-load, diversified, open-end
management  investment  company  registered under the Investment  Company Act of
1940. The Fund has authorized the creation of three managed  portfolios of money
market  instruments:   U.S.  Treasury  Portfolio,  Money  Market  Portfolio  and
Municipal Portfolio. Presently only the Money Market Portfolio and U.S. Treasury
Portfolio have been  activated.  The Money Market and U.S.  Treasury  Portfolios
each have three  classes  of stock  authorized,  Class A,  Class B and  Pinnacle
shares.  The Class A shares  of each  Portfolio  are  subject  to a service  fee
pursuant to each  Portfolio's  distribution  and service  plan.  The Class B and
Pinnacle shares are not subject to a service fee.  Additionally,  each Portfolio
may allocate  among its classes  certain  expenses,  to the extent  allowable to
specific classes,  including transfer agent fees, government  registration fees,
certain printing and postage costs, and administrative and legal expenses. Class
specific  expenses of the Fund were limited to  shareholder  servicing  fees and
transfer agent expenses. Income, expenses (other than expenses attributable to a
specific class), and realized and unrealized gains and losses on investments are
allocated to each class of shares based on its relative net assets. In all other
respects, all share classes represent the same interest in the income and assets
of each respective  Portfolio.  The Fund's financial  statements are prepared in
accordance with accounting principles generally accepted in the United States of
America for investment companies as follows:

     a) Valuation  of  Securities -
     Investments are valued at amortized cost.  Under this valuation  method,  a
     portfolio  instrument  is valued at cost and any  discount  or  premium  is
     amortized  on a  constant  basis to the  maturity  of the  instrument.  The
     maturity of variable rate demand  instruments is deemed to be the longer of
     the period  required  before the Fund is entitled to receive payment of the
     principal  amount or the  period  remaining  until the next  interest  rate
     adjustment.

     b) Repurchase  Agreements -
     In connection with transactions in repurchase agreements,  it is the Fund's
     policy that its  custodian  take  possession of the  underlying  collateral
     securities,  the fair value of which  exceeds the  principal  amount of the
     repurchase  transaction,  including accrued interest,  at all times. If the
     seller  defaults,  and the fair market  value of the  collateral  declines,
     realization of the collateral by the Fund may be delayed or limited.

     c) Federal Income Taxes -
     It is the policy of each Portfolio to comply with the  requirements  of the
     Internal Revenue Code applicable to regulated  investment  companies and to
     distribute all of its taxable  income to its  shareholders.  Therefore,  no
     provision for federal income tax is required.

     d)  Dividends  and   Distributions  -
     Dividends from investment income (including net realized short-term capital
     gains) are declared  daily,  paid  monthly and taxable as ordinary  income.
     Capital gains  distributions  if any, will be made at least annually and in
     no event later than sixty days after the end of the Fund's fiscal year.

     e) Use of Estimates -
     The  preparation  of financial  statements  in conformity  with  accounting
     principles  generally  accepted  in the United  States of America  requires
     management  to make  estimates  and  assumptions  that affect the  reported
     amounts of assets and liabilities  and disclosure of contingent  assets and
     liabilities  at the  date of the  financial  statements  and  the  reported
     amounts of increases and decreases in net assets from operations during the
     reporting period. Actual results could differ from those estimates.

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



- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)

================================================================================
1. Summary of Accounting Policies (Continued)
     f) General -
     Securities  transactions  are  recorded  on a trade  date  basis.  Interest
     income,  including  accretion of discount and  amortization of premium,  is
     accrued as earned.  Realized gains and losses from securities  transactions
     are recorded on the identified cost basis.

2. Investment Management Fees and Other Transactions with Affiliates

Under the Investment Management Contract, each Portfolio pays an investment
management fee to Reich & Tang Asset Management, LLC (the "Manager") at the
annual rate of .12% of the Portfolio's average daily net assets.

Pursuant to an  Administrative  Services  Contract  each  Portfolio  pays to the
Manager  an annual  fee of .05% of the  Portfolio's  average  daily net  assets.

Pursuant to a  Distribution  and  Service  Plan  adopted  under  Securities  and
Exchange  Commission Rule 12b-1,  the Fund and Reich & Tang  Distributors,  Inc.
(the  "Distributor"),   an  affiliate  of  the  Manager,  have  entered  into  a
Distribution  Agreement and a Shareholder  Servicing  Agreement (with respect to
the Class A shares of the Fund only).  For its  services  under the  Shareholder
Servicing Agreement,  the Distributor receives from each Portfolio a service fee
equal to .25% per  annum of each  Portfolio's  average  daily  net  assets  with
respect only to the Class A shares.

For the period ended September 30, 2005, the following fees were voluntarily
waived by the Manager and shareholder servicing agent:



                                             Money Market Portfolio      U.S. Treasury Portfolio
                                             ----------------------      -----------------------
                                                                       
Investment management fees                       $    107,585                $     -0-
Administration fees                                   107,585                      156,716
Transfer agency fees  - Class A                        14,527                      -0-
Transfer agency fees  - Class B                        39,132                      -0-
                                                 ------------                --------------
     Total                                       $    268,829                $      156,716
                                                 ============                ==============


The Manager and shareholder servicing agent have no right to recoup prior fee
waivers.

Fees are paid to Trustees who are unaffiliated  with the Manager on the basis of
$5,000 per annum plus  $1,200 per  meeting  attended  (there are five  scheduled
Board Meetings each year). In addition, the Audit Committee Chairman receives an
aggregate payment of $1,000 per quarter allocated among the funds of the Reich &
Tang  Complex on whose  Audit  Committee  he serves and each member of the Audit
Committee will receive an aggregate  payment of $750 per Audit Committee meeting
attended allocated among the funds of the Reich & Tang Complex.

Included  in  the  Statements  of  Operations  under  the  caption  "Shareholder
servicing  and  related  shareholder  expenses"  are fees of $78,153 for the U.S
Treasury  Portfolio  paid to Reich & Tang  Services,  Inc.,  an affiliate of the
Manager,  as shareholder  servicing agent for the Fund. Pursuant to the Transfer
Agency  Agreement,  the Transfer  Agent receives a fee of $17.40 per account per
year or a minimum of 0.02% of the monthly  average net assets of the Class A and
B shares of the Fund.  For the  period  ended  September  30,  2005  these  fees
amounted  to an annual  rate of 0.02% of the  monthly  average net assets of the
Class A and B shares of the Fund.

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

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



================================================================================
2. Investment Management Fees and Other Transactions with Affiliates (continued)

For the period ended September 30, 2005, the breakdown of expenses paid
indirectly by the Fund were as follows:


                                            Money Market Portfolio        U.S. Treasury Portfolio
                                                                         
Custodian expenses                                $     8,598                  $     12,526
Shareholder servicing
    and related shareholder expenses                      299                           260
                                                  -----------                  ------------
    Total                                         $     8,897                  $     12,786
                                                  ===========                  ============



3. Transactions in Shares of Beneficial Interest

At September 30, 2005, an unlimited number of shares of beneficial interest
($0.001 par value) were authorized. Transactions, all at $1.00 per share, were
as follows:



                                                    Money Market Portfolio                U.S. Treasury Portfolio
                                              ----------------------------------     ---------------------------------
                                               Six Months Ended       Year            Six Months Ended       Year
                                              September 30, 2005      Ended          September 30, 2005      Ended
                                                  (Unaudited)     March 31, 2005         (Unaudited)    March 31, 2005
                                                   ---------      --------------          ---------     --------------
Class A shares
- --------------
                                                                                               
Sold......................................         906,702,849       911,145,861         514,099,574       938,506,250
Issued on reinvestment of dividends.                 1,901,646           916,026           1,721,452           913,366
Redeemed..................................        (840,615,894)     (845,446,215)       (505,667,481)     (964,728,939)
                                                --------------    --------------      --------------    --------------
Net increase (decrease)...................          67,988,601        66,615,672          10,153,545       (25,309,323)
                                                ==============    ==============      ==============    ==============
Class B shares
- --------------
Sold......................................       1,040,734,409     1,297,610,795       1,013,717,065     1,489,030,576
Issued on reinvestment of dividends.......           4,190,140         2,764,393           1,213,809           981,169
Redeemed..................................        (880,740,428)   (1,248,890,464)       (983,737,818)   (1,472,618,028)
                                                --------------    --------------      --------------    --------------
Net increase (decrease)...................         164,184,121        51,484,724          31,193,056        17,393,717
                                                ==============    ==============      ==============    ==============
Pinnacle shares
- ---------------
Sold......................................          94,176,259        94,179,403          20,604,900        62,221,333
Issued on reinvestment of dividends.......           1,769,366         1,912,377             550,859           559,350
Redeemed..................................        (101,629,977)     (104,138,169)        (26,637,023)      (52,223,418)
                                                --------------    --------------      --------------    --------------
Net increase (decrease)...................          (5,684,352)       (8,046,389)         (5,481,264)       10,557,265
                                                ==============    ==============      ==============    ==============




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

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)

================================================================================

4. Tax Information
The tax character of all  distributions  paid by the Portfolios during the years
ended March 31, 2005 and 2004 was ordinary income.

At March 31 2005,  the Money  Market  Portfolio  had unused  capital  loss carry
forwards  of $151,  available  for  Federal  income tax  purposes  to be applied
against future gains,  if any. If not applied  against future gains,  the entire
amount will expire in the year 2012.

During  the year ended  March 31,  2005,  the Money  Market  Portfolio  utilized
capital loss carryforwards of $7.

During the year ended March 31, 2005,  as  permitted  under  Federal  income tax
regulation,  the Money Market Portfolio elected to defer $66 of post-October net
capital losses to the next taxable year.

At  March  31,  2005,  the U.S.  Treasury  Portfolio  had  unused  capital  loss
carryforwards of $1,121, available for Federal income tax purposes to be applied
against future gains, if any. If not applied  against future gains,  $1,121 will
expire in the year 2013.

At March 31,  2005,  there were no  distributable  earnings for the Money Market
Portfolio and U.S. Treasury Portfolio.



















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

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



================================================================================
5. Financial Highlights


                                                                             Money Market Portfolio
                                               -------------------------------------------------------------------------------
                                                Six Months Ended
Class A shares                                 September 30, 2005                  For the Year Ended March 31,
- --------------                                    (Unaudited)   --------------------------------------------------------------
                                                   ---------       2005         2004         2003         2002         2001
                                                                ----------   ----------   ----------   ----------   ----------
                                                                                                  
Per Share Operating Performance:
(for a share outstanding throughout the period)
Net asset value, beginning of period........       $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Income from investment operations:
  Net investment income.....................          0.014        0.013        0.007        0.013        0.028        0.060
  Net realized and unrealized gain(loss)
    on investments..........................           --          0.000        0.000        0.000        0.000        0.000
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total from investment operations..........          0.014        0.013        0.007        0.013        0.028        0.060
Less distributions from:
  Dividends from net investment income......         (0.014)      (0.013)      (0.007)      (0.013)      (0.028)      (0.060)
  Net realized gain on investments..........           --         (0.000)      (0.000)      (0.000)      (0.000)      (0.000)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total Distributions.......................         (0.014)      (0.013)      (0.007)      (0.013)      (0.028)      (0.060)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Net asset value, end of period..............       $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   =========    ==========   ==========   ==========   ==========   ==========
Total Return................................          1.40%(a)     1.34%        0.73%        1.33%        2.85%        6.16%
Ratios/Supplemental Data
Net assets, end of period (000's)...........       $ 187,977    $ 119,989    $  53,373    $ 114,337    $  67,459    $1,101,858
Ratios to average net assets:
  Expenses (net of fees waived) (b).........          0.47%(c)     0.47%        0.47%        0.47%        0.45%        0.45%
  Net investment income.....................          2.79%(c)     1.49%        0.73%        1.32%        3.39%        5.96%
  Management and administration fees waived.          0.08%(c)     0.08%        0.06%        0.06%        0.02%        0.02%
  Shareholder servicing fees waived.........          0.02%(c)     0.02%        0.02%        0.00%        0.00%        0.00%
  Expenses paid indirectly..................          0.00%(c)     0.00%        0.00%        0.00%        0.00%        0.00%

(a) Not annualized
(b) Includes expenses paid indirectly
(c) Annualized




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

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)

================================================================================
5. Financial Highlights (Continued)


                                                                             Money Market Portfolio
                                               -------------------------------------------------------------------------------
                                                Six Months Ended
Class B shares                                 September 30, 2005                  For the Year Ended March 31,
- --------------                                    (Unaudited)   --------------------------------------------------------------
                                                   ---------       2005         2004         2003         2002         2001
                                                                ----------   ----------   ----------   ----------   ----------
                                                                                                  
Per Share Operating Performance:
(for a share outstanding throughout the period)
Net asset value, beginning of period........       $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Income from investment operations:
  Net investment income.....................          0.015        0.016        0.010        0.016        0.031        0.062
  Net realized and unrealized gain(loss)
    on investments..........................           --          0.000        0.000        0.000        0.000        0.000
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total from investment operations..........          0.015        0.016        0.010        0.016        0.031        0.062
Less distributions from:
  Dividends from net investment income......         (0.015)      (0.016)      (0.010)      (0.016)      (0.031)      (0.062)
  Net realized gain on investments..........           --         (0.000)      (0.000)      (0.000)      (0.000)      (0.000)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total Distributions.......................         (0.015)      (0.016)      (0.010)      (0.016)      (0.031)      (0.062)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Net asset value, end of period..............       $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   =========    ==========   ==========   ==========   ==========   ==========
Total Return................................          1.54%(a)     1.61%        1.00%        1.61%        3.12%        6.42%
Ratios/Supplemental Data
Net assets, end of period (000's)...........       $ 379,498      $ 215,134   $ 163,829     $132,837     $ 123,267   $ 211,725
Ratios to average net assets:
  Expenses (net of fees waived) (b).........          0.20%(c)     0.20%        0.20%        0.20%        0.20%        0.20%
  Net investment income.....................          3.08%(c)     1.63%        0.99%        1.60%        3.15%        6.20%
  Management and administration fees waived.          0.08%(c)     0.08%        0.06%        0.06%        0.02%        0.02%
  Shareholder servicing fees waived.........          0.02%(c)     0.02%        0.02%        0.02%        0.01%        0.00%
  Expenses paid indirectly..................          0.00%(c)     0.00%        0.00%        0.00%        0.00%        0.00%

(a) Not Annualized
(b) Includes expenses paid indirectly
(c) Annualized




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

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



================================================================================
5. Financial Highlights (Continued)


                                                                             Money Market Portfolio
                                               -------------------------------------------------------------------------------
                                                Six Months Ended
Pinnacle shares                                September 30, 2005                  For the Year Ended March 31,
- --------------                                    (Unaudited)   --------------------------------------------------------------
                                                   ---------       2005         2004         2003         2002         2001
                                                                ----------   ----------   ----------   ----------   ----------
                                                                                                  
Per Share Operating Performance:
(for a share outstanding throughout the period)
Net asset value, beginning of period...........    $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Income from investment operations:
  Net investment income........................       0.015        0.016        0.010        0.016        0.031        0.062
  Net realized and unrealized gain(loss)
    on investments.............................        --          0.000        0.000        0.000        0.000        0.000
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total from investment operations.............       0.015        0.016        0.010        0.016        0.031        0.062
Less distributions from:
  Dividends from net investment income.........      (0.015)      (0.016)      (0.010)      (0.016)      (0.031)      (0.062)
  Net realized gain on investments.............        --           --           --         (0.000)      (0.000)      (0.000)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total Distributions..........................      (0.015)      (0.016)      (0.010)      (0.016)      (0.031)      (0.062)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Net asset value, end of period.................    $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   =========    ==========   ==========   ==========   ==========   ==========
Total Return...................................       1.54%(a)     1.61%        1.00%        1.61%        3.12%        6.42%
Ratios/Supplemental Data
Net assets, end of period (000's)..............    $ 109,108    $ 114,792    $ 122,839    $ 130,135    $ 153,182    $ 128,777
Ratios to average net assets:
  Expenses (net of fees waived) (b)............       0.20%(c)     0.20%        0.20%        0.20%        0.20%       0.20%
  Net investment income........................       3.08%(c)     1.63%        0.99%        1.60%        3.15%       6.20%
  Management and administration fees waived....       0.08%(c)     0.08%        0.06%        0.06%        0.02%       0.02%
  Expenses paid indirectly.....................       0.00%(c)     0.00%        0.00%        0.00%        0.00%       0.00%

(a) Not Annualized
(b) Includes expenses paid indirectly
(c) Annualized




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

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)

================================================================================
5. Financial Highlights (Continued)



                                                                             U.S. Treasury Portfolio
                                               -------------------------------------------------------------------------------
                                                Six Months Ended
Class A shares                                 September 30, 2005                  For the Year Ended March 31,
- --------------                                    (Unaudited)   --------------------------------------------------------------
                                                   ---------       2005         2004         2003         2002         2001
                                                                ----------   ----------   ----------   ----------   ----------
                                                                                                  
Per Share Operating Performance:
(for a share outstanding throughout the period)
Net asset value, beginning of period........       $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Income from investment operations:
  Net investment income.....................          0.013        0.012        0.007        0.013        0.028        0.057
  Net realized and unrealized gain(loss)
    on investments..........................          0.000        0.000        0.000         --           --          0.000
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total from investment operations..........          0.013        0.012        0.007        0.013        0.028        0.057
Less distributions from:
  Dividends from net investment income......         (0.013)      (0.012)      (0.007)      (0.013)      (0.028)      (0.057)
  Net realized gain on investments..........         (0.000)      (0.000)      (0.000)        --           --         (0.000)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total Distributions.......................         (0.013)      (0.012)      (0.007)      (0.013)      (0.028)      (0.057)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Net asset value, end of period..............       $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   =========    ==========   ==========   ==========   ==========   ==========
Total Return................................          1.35%(a)     1.19%        0.66%        1.28%        2.86%        5.88%
Ratios/Supplemental Data
Net assets, end of period (000's)...........       $ 246,775    $ 236,621    $ 261,931    $ 276,174    $ 253,948    $ 579,869
Ratios to average net assets:
  Expenses (net of fees waived) (b).........          0.45%        0.45%        0.45%        0.45%        0.45%        0.46%
  Net investment income.....................          2.67%        1.18%        0.66%        1.28%        3.12%        5.68%
  Management and administration fees waived.          0.04%        0.03%        0.04%        0.03%        0.02%        0.02%
  Expenses paid indirectly..................          0.00%        0.00%        0.00%        0.00%        0.00%        0.01%

(a) Not annualized
(b) Includes expenses paid indirectly
(c) Annualized




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

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



================================================================================
5. Financial Highlights (Continued)


                                                                             U.S. Treasury Portfolio
                                               -------------------------------------------------------------------------------
                                                Six Months Ended
Class B shares                                 September 30, 2005                  For the Year Ended March 31,
- --------------                                    (Unaudited)   --------------------------------------------------------------
                                                   ---------       2005         2004         2003         2002         2001
                                                                ----------   ----------   ----------   ----------   ----------
                                                                                                  
Per Share Operating Performance:
(for a share outstanding throughout the period)
Net asset value, beginning of period........       $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Income from investment operations:
  Net investment income.....................          0.015        0.014        0.009        0.015        0.031        0.060
  Net realized and unrealized gain(loss)
    on investments..........................          0.000        0.000        0.000         --           --          0.000
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total from investment operations..........          0.015        0.014        0.009        0.015        0.031        0.060
Less distributions from:
  Dividends from net investment income......         (0.015)      (0.014)      (0.009)      (0.015)      (0.031)      (0.060)
  Net realized gain on investments..........         (0.000)      (0.000)      (0.000)        --           --         (0.000)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total Distributions.......................         (0.015)      (0.014)      (0.009)      (0.015)      (0.031)      (0.060)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Net asset value, end of period..............       $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   =========    ==========   ==========   ==========   ==========   ==========
Total Return................................          1.48%(a)     1.44%        0.91%        1.53%        3.12%        6.14%
Ratios/Supplemental Data
Net assets, end of period (000's)...........       $ 514,628    $ 484,434    $ 466,041    $ 383,677    $ 348,701    $ 151,356
Ratios to average net assets:
  Expenses (net of fees waived) (b).........          0.20%        0.20%        0.20%        0.20%        0.20%        0.21%
  Net investment income.....................          2.93%        1.45%        0.90%        1.51%        2.66%        5.89%
  Management and administration fees waived.          0.04%        0.03%        0.04%        0.03%        0.02%        0.02%
  Expenses paid indirectly..................          0.00%        0.00%        0.00%        0.00%        0.00%        0.01%

(a) Not annualized
(b) Includes expenses paid indirectly
(c) Annualized




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

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)

================================================================================

6. Financial Highlights (continued)


                                                                             U.S. Treasury Portfolio
                                               -------------------------------------------------------------------------------
                                                Six Months Ended
Pinnacle shares                                September 30, 2005                  For the Year Ended March 31,
- ---------------                                    (Unaudited)   --------------------------------------------------------------
                                                   ---------       2005         2004         2003         2002         2001
                                                                ----------   ----------   ----------   ----------   ----------
                                                                                                  
Per Share Operating Performance:
(for a share outstanding throughout the period)
Net asset value, beginning of period...........    $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Income from investment operations:
  Net investment income........................       0.015        0.014        0.009        0.015        0.031        0.060
  Net realized and unrealized gain(loss)
    on investments.............................       0.000        0.000        0.000         --           --          0.000
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total from investment operations.............       0.015        0.014        0.009        0.015        0.031        0.060
Less distributions from:
  Dividends from net investment income.........      (0.015)      (0.014)      (0.009)      (0.015)      (0.031)      (0.060)
  Net realized gain on investments.............      (0.000)      (0.000)      (0.000)        --           --         (0.000)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
  Total Distributions..........................      (0.015)      (0.014)      (0.009)      (0.015)      (0.031)      (0.060)
                                                   ---------    ----------   ----------   ----------   ----------   ----------
Net asset value, end of period.................    $  1.00      $  1.00      $  1.00      $  1.00      $  1.00      $  1.00
                                                   =========    ==========   ==========   ==========   ==========   ==========
Total Return...................................       1.48%(a)     1.44%        0.91%        1.53%        3.12%        6.14%
Ratios/Supplemental Data
Net assets, end of period (000's)..............    $  34,328    $  39,809    $  29,252    $  29,526    $  17,871    $  20,724
Ratios to average net assets:
  Expenses (net of fees waived) (b)............       0.20%        0.20%        0.20%        0.20%        0.20%        0.21%
  Net investment income........................       2.93%        1.45%        0.90%        1.51%        2.66%        5.89%
  Management and administration fees waived....       0.04%        0.03%        0.04%        0.03%        0.02%        0.02%
  Expenses paid indirectly.....................       0.00%        0.00%        0.00%        0.00%        0.00%        0.01%

(a) Not annualized
(b) Includes expenses paid indirectly
(c) Annualized




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

- --------------------------------------------------------------------------------
INSTITUTIONAL DAILY INCOME FUND
ADDITIONAL INFORMATION
(UNAUDITED)

================================================================================


ADDITIONAL INFORMATION ABOUT PORTFOLIO HOLDINGS

The Fund is required to file its complete  schedule of portfolio  holdings  with
the  Securities  and Exchange  Commission  ("SEC") on Form N-Q for its first and
third fiscal  quarters.  The Fund's Form N-Q is available  without charge on the
SEC's  website  (http://www.sec.gov)  or by calling  the Fund toll free at (800)
433-1918.  You can also obtain  copies of the Fund's  Form N-Q by  visiting  the
SEC's  Public  Reference  Room in  Washington,  DC (please call the SEC at (800)
732-0330 for information on the operation of the Public Reference Room).

INFORMATION ABOUT PROXY VOTING

Information  regarding  the Fund's proxy  voting  record for the 12 month period
ending  June 30 of each year is filed  with the SEC on Form  N-PX no later  than
August 31 of each year. The Fund's Form N-PX is available  without charge,  upon
request,  by  calling  the  Fund at  (800)  433-1918  and on the  SEC's  website
(http//www.sec.gov). The Fund does not presently invest in voting securities and
has therefore not adopted proxy voting policies and procedures.

























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






- --------------------------------------------------------------------------------
This report is submitted for the general  information of the shareholders of the
Fund. It is not authorized for distribution to prospective investors in the Fund
unless  preceded or  accompanied  by an  effective  prospectus,  which  includes
information  regarding the Fund's  objectives  and  policies,  experience of its
management, marketability of shares, and other information.
- --------------------------------------------------------------------------------


Institutional Daily Income Fund
     600 Fifth Avenue
     New York, New York 10020

Manager
     Reich & Tang Asset Management, LLC
     600 Fifth Avenue
     New York, New York 10020

Custodian
     The Bank of New York
     101 Barclay Street, 13th Floor
     New York, New York 10286

Transfer Agent &
 Dividend Disbursing Agent
     Reich & Tang Services, Inc.
     600 Fifth Avenue
     New York, New York 10020





IDI9/05S




INSTITUTIONAL
DAILY
INCOME FUND












             Semi-Annual Report
             September 30, 2005
                (Unaudited)

ITEM 2:    CODE OF ETHICS

Not Applicable (disclosure required in annual report on N-CSR only).

ITEM 3:    AUDIT COMMITTEE FINANCIAL EXPERT

Not Applicable (disclosure required in annual report on N-CSR only).

ITEM 4:    PRINCIPAL ACCOUNTANT FEES AND SERVICES

Not Applicable (disclosure required in annual report on N-CSR only).

ITEM 5:    AUDIT COMMITTEE OF LISTED REGISTRANTS

Not applicable.

ITEM 6:    SCHEDULE OF INVESTMENTS

Schedule of Investments in securities of unaffiliated issuers is included under
Item 1.

ITEM 7:    DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END
           MANAGEMENT INVESTMENT COMPANIES

Not applicable.

ITEM 8:    PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT
           COMPANY AND AFFILIATED PURCHASERS

Not applicable.

ITEM 9:    SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

There were no material changes to the procedures by which shareholders may
recommend nominees to the registrant's board of directors that were implemented
after the registrant last provided disclosure in response to the requirements of
Item 7(d)(2)(ii)(G) of Schedule 14A, or this Item 9.

ITEM 10:   CONTROLS AND PROCEDURES

(a)      The registrant's Principal Executive Officer and Principal Financial
         Officer have evaluated the design and operation of the registrant's
         disclosure controls and procedures within 90 days of this filing and
         have concluded that the registrant's disclosure controls and procedures
         were effective in ensuring that information required to be disclosed by
         the registrant in this Form N-CSR was recorded, processed, summarized
         and reported on a timely basis.

(b)      There were no changes in the registrant's internal controls over
         financial reporting that occurred during the second fiscal quarter of
         the period covered by this report that have materially affected, or are
         reasonably likely to affect, the registrant's internal controls over
         financial reporting.

ITEM 11:   EXHIBITS

(a)(1) Not applicable (disclosure required in annual report on N-CSR only).

(a)(2) Certifications of Principal Executive Officer and Principal Financial
       Officer, under Rule 30a-2 of the Investment Company Act of 1940.

(a)(3) Not applicable.

(b)    Certifications of Principal Executive Officer and Principal Financial
       Officer, under Section 906 of the Sarbanes-Oxley Act of 2002 and 18
       U.S.C. ss.1350.



                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant) Institutional Daily Income Fund

 By (Signature and Title)*          /s/ Rosanne Holtzer
                                    -------------------
                                    Rosanne Holtzer, Secretary

Date: December 1, 2005

Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, this report has been signed below by the
following persons on behalf of the registrant and in the capacities and on the
dates indicated.

By (Signature and Title)*           /s/ Steven W. Duff
                                    ------------------
                                    Steven W. Duff, President

Date: December 1, 2005

By (Signature and Title)*           /s/ Anthony Pace
                                    ----------------
                                    Anthony Pace, Treasurer

Date: December 1, 2005

* Print the name and title of each signing officer under his or her signature.