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

                                    FORM 10-K

                   Annual Report Pursuant to Section 13 or 15(d)
                      of the Securities Exchange Act of 1934

                             For the fiscal year ended
                                 December 31, 2006

                   Commission file number: 333-131328-03

                       Impac Secured Assets Trust 2006-4
          (Exact name of issuing entity as specified in its Charter)

                         Impac Secured Assets Corp.
           (Exact name of depositor as specified in its Charter)

                            Impac Funding Corporation
             (Exact name of sponsor as specified in its Charter)

                  California                                33-0715871
           (State or other jurisdiction                  (I.R.S. Employer
           incorporation or organization)              Identification Number)

          19500 Jamboree Road
          Irvine, California                             92612
         (Address of principal executive offices)      (Zip Code)

            Registrant's telephone number, including area code:
                               (949) 475-3600

          Securities registered pursuant to Section 12(b) of the Act:
                                     None.

          Securities registered pursuant to Section 12(g) of the Act:
                                     None.

     Indicate by check mark if the registrant is a well-known seasoned
     issuer, as defined in Rule 405 of the Securities Act.  Yes [ ]  No[X]

     Indicate by check mark if the registrant is not required to file
     reports pursuant to Section 13 or Section 15(d) of the Act.  Yes[ ] No[X]

     Indicate by check mark whether the Registrant (1) has filed all reports
     required to be filed by Section 13 or 15(d) of the Securities Exchange
     Act of 1934 during the preceding 12 months (or for such shorter period
     that the Registrant was required to file such reports), and (2) has been
     subject to such filing requirements for the past 90 days.  Yes [X]  No [ ]

     Indicate by check mark if disclosure of delinquent filers pursuant to
     Item 405 of Regulation S-K is not contained herein, and will not be
     contained, to the best of the Registrant's knowledge, in definitive proxy
     or information statements incorporated by reference in Part III of the
     Form 10-K or any amendment to this Form 10-K.        Not Applicable

     Indicate by check mark whether the registrant is a large accelerated
     filer, an accelerated filer, or a non-accelerated filer.  See definition
     of "accelerated filer" in Rule 12b-2 of the Exchange Act.  (Check One):

      Large accelerated filer [  ]  Accelerated Filer [  ]
      Non-accelerated Filer [X]

     Indicate by check mark whether the registrant is a shell company (as
     defined in rule 12b-2 of the Act).  [  ] Yes  [X ] No

     State the aggregate market value of the voting and non-voting common
     equity held by non-affiliates computed by reference to the price at
     which the common equity was last sold, or the average bid and asked
     price of such common equity, as of the of the last business day of
     the registrant's most recently completed second fiscal quarter

     Not Applicable.

     DOCUMENTS INCORPORATED BY REFERENCE
       List hereunder the following documents if incorporated by reference
     and the Part of the Form 10-K (e.g., Part I, Part II, etc.) into which
     the document is incorporated:  (1) Any annual report to security holders;
     (2) Any proxy or information statement; and (3) Any prospectus filed
     pursuant to Rule 424(b) or (c) under the Securities Act of 1933.  The
     listed documents should be clearly described for identification purposes
     (e.g., annual report to security holders for fiscal year ended
     December 24, 1980).

     Not Applicable.

     PART I

     ITEM 1.  Business.

     Omitted.

     ITEM 1A.  Risk Factors.

     Omitted.

     ITEM 1B.  Unresolved Staff Comments.

     Omitted.

     ITEM 2.  Properties.

     Omitted.

     ITEM 3.  Legal Proceedings.

     None.

     ITEM 4.  Submission of Matters to a Vote of Security Holders.

     Omitted.

     PART II

     ITEM 5.  Market for Registrant's Common Equity, Related Stockholder
     Matters and Issuer Purchases of Equity Securities.

     Omitted.

     ITEM 6.  Selected Financial Data.

     Omitted.

     ITEM 7.  Management's Discussion and Analysis of Financial Condition and
     Results of Operations.

     Omitted.

     ITEM 7A.  Quantitative and Qualitative Disclosures About Market Risk.

     Omitted.

     ITEM 8.  Financial Statements and Supplementary Data.

     Omitted.

     ITEM 9.  Changes in and Disagreements with Accountants on Accounting and
     Financial Disclosure.

     Omitted.

     ITEM 9A.  Controls and Procedures.

     Omitted.

     ITEM 9A(T).  Controls and Procedures.

     Omitted.

     ITEM 9B. Other Information.

     None.

     PART III

     ITEM 10.  Directors, Executive Officers and Corporate Governance.

     Omitted.

     ITEM 11.  Executive Compensation.

     Omitted.

     ITEM 12.  Security Ownership of Certain Beneficial Owners and Management
               and Related Stockholder Matters.

     Omitted.

     ITEM 13.  Certain Relationships and Related Transactions, and
     Director Independence.

     Omitted.

     ITEM 14.  Principal Accounting Fees and Services.

     Omitted.

     PART IV

     Additional Items Required by General Instruction J (2)

     Item 1112(b) of Regulation AB, Significant Obligor Financial Information.

     None.

     Item 1114(b)(2) and Item 1115(b) of Regulation AB , Significant
     Enhancement Provider Information.

     None.

     Item 1117 of Regulation AB, Legal Proceedings.

     No applicable updates.

     Item 1119 of Regulation AB, Affiliations and Certain Relationships and
     Related Transactions.

     No applicable updates.

     Item 1122 of Regulation AB, Compliance with Applicable Servicing Criteria

     See Item 15.

     Item 1123 of Regulation AB, Servicer Compliance Statement

     See Item 15.

     ITEM 15. Exhibits, Financial Statement Schedules.

     (a) List the following documents filed as a part of the report:

         (1) Not Applicable.

         (2) Not Applicable.

         (3) Exhibits

             Exhibit 1.1 Underwriting Agreement, dated November 3, 2006 among
             Impac Funding Corporation, Impac Secured Assets Corp., Impac
             Mortgage Holdings Inc., Bear, Stearns & Co. Inc. and Countrywide
             Securities Corporation, originally filed on Form 8-K on December
             1, 2006 and incorporated by refernece herein.

             Exhibit 4.1 Pooling and Servicing Agreement, dated as of November
             1, 2006 among Impac Secured Assets Corp., as depositor, Impac
             Funding Corporation, as master servicer and Deutsche Bank National
             Trust Company, as trustee,originally filed on Form 8-K on
             December 1, 2006 and incorporated by refernece herein.

             Exhibit 31 Section 302 Certification.

             Exhibit 33.1 Impac Funding Corporation's Annual Report on
             Assessment of Compliance for Year End December 31, 2006.

             Exhibit 33.2 Countrywide Home Loans Servicing LP's Annual
             Report on Assessment of Compliance for Year End
             December 31, 2006.

             Exhibit 33.3 Trustee's Annual Report on Assessment of
             Compliance for Year End December 31, 2006.

             Exhibit 34.1 Impac Funding Corporation's Annual Attestation
             Report on Assessment of Compliance with Servicing Criteria for
             Year End December 31, 2006.

             Exhibit 34.2 Countrywide Home Loans Servicing LP's Annual
             Attestation Report on Assessment of Compliance with Servicing
             Criteria for Year End December 31, 2006.

             Exhibit 34.3 Trustee's Annual Attestation Report on
             Assessment of Compliance with Servicing Criteria for Year
             End December 31, 2006.

             Exhibit 35.1 Impac Funding Corporation's Annual Statement of
             Compliance for Year End December 31, 2006.

             Exhibit 35.2 Countrywide Home Loans Servicing LP's Annual
             Statement of Compliance for Year End December 31, 2006.

     (b) See (a) above.

     (c) Not Applicable.




                                      SIGNATURE

          Pursuant to the requirements of Section 13 or 15(d) of the
          Securities Exchange Act of 1934, the Registrant has duly caused
          this report to be signed on its behalf by the undersigned,
          thereunto duly authorized.


                             By: Impac Funding Corporation,
                             as Master Servicer on behalf of the Registrant

                                      By:  /s/: Mario Fegan
                                           Mario Fegan
                                           Vice President


     Date: March 29, 2007

     EXHIBIT INDEX

     Exhibit Document

      1.1 Underwriting Agreement, dated November 3, 2006 among Impac Funding
          Corporation, Impac Secured Assets Corp., Impac Mortgage Holdings
          Inc., Bear, Stearns & Co. Inc. and Countrywide Securities
          Corporation, originally filed on Form 8-K on December 1, 2006 and
          incorporated by refernece herein.

      4.1 Pooling and Servicing Agreement, dated as of November 1, 2006
          among Impac Secured Assets Corp., as depositor, Impac Funding
          Corporation, as master servicer and Deutsche Bank National Trust
          Company, as trustee,originally filed on Form 8-K on December 1, 2006
          and incorporated by refernece herein.

      31   Section 302 Certification.

      33.1 Impac Funding Corporation's Annual Report on Assessment of
           Compliance for Year End December 31, 2006.

      33.2 Countrywide Home Loans Servicing LP's Annual Report on Assessment
           of Compliance for Year End December 31, 2006.

      33.3 Trustee's Annual Report on Assessment of Compliance for Year End
           December 31, 2006.

      34.1 Impac Funding Corporation's Annual Attestation Report on
           Assessment of Compliance with Servicing Criteria for Year End
           December 31, 2006.

      34.2 Countrywide Home Loans Servicing LP's Annual Attestation Report
           on Assessment of Compliance with Servicing Criteria for Year End
           December 31, 2006.

      34.3 Trustee's Annual Attestation Report on Assessment of Compliance
           with Servicing Criteria for Year End December 31, 2006.

      35.1 Impac Funding Corporation's Annual Statement of Compliance for
           Year End December 31, 2006.

      35.2 Countrywide Home Loans Servicing LP's Annual Statement of
           Compliance for Year End December 31, 2006.