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                 UNITED STATES                           OMB APPROVAL
      SECURITIES AND EXCHANGE COMMISSION         ----------------------------
            WASHINGTON, D.C. 20549               OMB Number:        3235-0058
                                                 Expires:      March 31, 2006
                                                 Estimated average
                 FORM 12B-25                     burden hours per
                                                 response............... 2.50
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           NOTIFICATION OF LATE FILING                  SEC FILE NUMBER
                                                         333-85310-03
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                                                         CUSIP NUMBER
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(CHECK ONE):   [X] Form 10-K   [  ] Form 20-F   [  ] Form 10-Q   [  ] Form N-SAR

              For Period Ended:  DECEMBER 31, 2004
              [  ] Transition Report on Form 10-K
              [  ] Transition Report on Form 20-F
              [  ] Transition Report on Form 11-K
              [  ] Transition Report on Form 10-Q
              [  ] Transition Report on Form N-SAR

              For the Transition Period Ended:_____________________________

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  READ INSTRUCTION (ON BACK PAGE) BEFORE PREPARING FORM. PLEASE PRINT OR TYPE.
NOTHING IN THIS FORM SHALL BE CONSTRUED TO IMPLY THE COMMISSION HAS VERIFIED ANY
                          INFORMATION CONTAINED HEREIN.
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If the notification relates to a portion of the filing checked above, identify
the Item(s) to which the notification relates:
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PART I - REGISTRANT INFORMATION

    IMPAC SECURED ASSETS CORP MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 2004-1
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Full Name of Registrant


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Former Name if Applicable


    1401 DOVE STREET
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Address of Principal Executive Office (STREET AND NUMBER)


    NEWPORT BEACH, CA 92660
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City, State and Zip Code

PART II - RULES 12B-25(B) AND (C)

If the subject report could not be filed without unreasonable effort or expense
and the registrant seeks relief pursuant to Rule 12b-25(b), the following should
be completed. (Check box if appropriate)

         (a)      The reason described in reasonable detail in Part III of this
                  form could not be eliminated without unreasonable effort or
                  expense
[X]      (b)      The subject annual report, semi-annual report, transition
                  report on Form 10-K, Form 20-F, Form 11-K or Form NSAR, or
                  portion thereof, will be filed on or before the fifteenth
                  calendar day following the prescribed due date; or the subject
                  quarterly report or transition report on Form 10-Q, or portion
                  thereof will be filed on or before the fifth calendar day
                  following the prescribed due date; and
         (c)      The accountant's statement or other exhibit required by Rule
                  12b-25(c) has been attached if applicable.

PART III - NARRATIVE

State below in reasonable detail why forms 10-K, 20-F, 11-K, 10-Q, N-SAR, or the
transition report or portion thereof, could not be filed within the prescribed
time period.

Impac Funding Corporation is not able to file on behalf of the registrant on or
before March 31, 2005 the annual report on Form 10-K of the registrant without
unreasonable effort or expense.



Despite the best efforts of Impac, Impac was not able to obtain the
documentation from an unaffiliated third party necessary to conduct the annual
review required by the Servicing Agreement until shortly before the filing date
prescribed by the Commission for the annual report. Completion of the annual
review is necessary to identify any deficiencies which must be disclosed in the
Form 10-K annual report and for an Impac officer to make the required
corresponding certification. Therefore, Impac cannot complete the annual review
and prepare the annual report in the short amount of time available without
unreasonable effort or expense. Impac intends to file on behalf of the
registrant on or before April 15, 2005 a complete annual report on Form 10-K.

(Attach extra Sheets if Needed)

                   Persons who are to respond to the collection of information
SEC 1344 (11-02)   contained In this form are not required to respond unless the
                   form displays acurrently valid OMB control number.




PART IV - OTHER INFORMATION

(1)      Name and telephone number of person to contact in regard to this
         notification

         EDWARD J. SOUTHGATE            (212)                912-7559
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               (Name)                (Area Code)         (Telephone Number)

(2)      Have all other periodic reports required under Section 13 or l5(d) of
         the Securities Exchange Act of 1934 or Section 30 of the Investment
         Company Act of 1940 during the preceding 12 months or for such shorter
         period that the registrant was required to file such report(s) been
         filed ? If answer is no, identify report(s).        Yes [X] No [  ]

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(3)      Is it anticipated that any significant change in results of operations
         from the corresponding period for the last fiscal year will be
         reflected by the earnings statements to be included in the subject
         report or portion thereof?
                                                      Yes [  ] No [  ]
         If so, attach an explanation of the anticipated change, both
         narratively and quantitatively, and, if appropriate, state the reasons
         why a reasonable estimate of the results cannot be made.

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           IMPAC SECURED ASSETS CORP MORTGAGE PASS THR CERT SER 2004-1
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                  (Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned
hereunto duly authorized.

Date  MARCH 31, 2005                        By /s/ Richard J. Johnson
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                                                   Richard J. Johnson, EVP, CFO

INSTRUCTION: The form may be signed by an executive officer of the registrant or
by any other duly authorized representative. The name and title of the person
signing the form shall be typed or printed beneath the signature. If the
statement is signed on behalf of the registrant by an authorized representative
(other than an executive officer), evidence of the representative's authority to
sign on behalf of the registrant shall be filed with the form.

                                    ATTENTION

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   INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE FEDERAL CRIMINAL
                        VIOLATIONS (SEE 18 U.S.C. 1001).
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                              GENERAL INSTRUCTIONS

1.   This form is required by Rule l2b-25 (17 CFR 240.12b-25) of the General
     Rules and Regulations under the Securities Exchange Act of 1934.

2.   One signed original and four conformed copies of this form and amendments
     thereto must be completed and filed with the Securities and Exchange
     Commission, Washington, D.C. 20549, in accordance with Rule 0-3 of the
     General Rules and Regulations under the Act. The information contained in
     or filed with the form will be made a matter of public record in the
     Commission files.

3.   A manually signed copy of the form and amendments thereto shall be filed
     with each national securities exchange on which any class of securities of
     the registrant is registered.

4.   Amendments to the notifications must also be filed on Form 12b-25 but need
     not restate information that has been correctly furnished. The form shall
     be clearly identified as an amended notification.

5.   ELECTRONIC FILERS: This form shall not be used by electronic filers unable
     to timely file a report solely due to electronic difficulties. Filers
     unable to submit reports within the time period prescribed due to
     difficulties in electronic filing should comply with either Rule 201 or
     Rule 202 of Regulation S-T (ss.232.201 or ss.232.202 of this chapter) or
     apply for an adjustment in filing date pursuant to Rule 13(b) of Regulation
     S-T (ss.232.13(b) of this chapter).