Exhibits 5.1, 8.1, 23.1 ----------------------- March 21, 2000 Impac Secured Assets Corp. 1401 Dove Street Newport Beach, California 92660 Impac Secured Assets Corp. Mortgage Pass-Through Certificates Mortgage-Backed Notes Registration Statement on Form S-3 ---------------------------------- Ladies and Gentlemen: We are counsel to Impac Secured Assets Corp., a Delaware corporation (the "Registrant"), in connection with the registration under the Securities Act of 1933, as amended (the "1933 Act"), of Mortgage Pass-Through Certificates ("Certificates") and Mortgage-Backed Notes ("Notes"; collectively with Certificates, "Securities"), and the related preparation and filing of the Registration Statement on Form S-3 as an Exhibit to which this opinion letter is being filed (the "Registration Statement"). The Certificates are issuable in series under separate pooling and servicing agreements (each such agreement, a "Pooling and Servicing Agreement"), among the Registrant and a master servicer and a trustee, each to be identified in the prospectus supplement for such series of Certificates. The Notes are issuable in series under separate indentures (each such indenture, an "Indenture"), between an indenture trustee and an issuer to be formed, each to be identified in the prospectus supplement for such series of Notes. Each Pooling and Servicing Agreement and Indenture is substantially in the form filed as an Exhibit to the Registration Statement. In rendering this opinion letter, as to relevant factual matters we have examined the documents described above and such other documents as we have deemed necessary including, where we have deemed appropriate, representations or certifications of officers of parties thereto or public officials. In rendering this opinion letter, except for the matters that are specifically Impac Secured Assets Corp. Page 2. March 21, 2000 addressed in the opinions expressed below, we have assumed (i) the authenticity of all documents submitted to us as originals or as copies thereof, and the conformity to the originals of all documents submitted to us as copies, (ii) the necessary entity formation and continuing existence in the jurisdiction of formation, and the necessary licensing and qualification in all jurisdictions, of all parties to all documents, (iii) the necessary authorization, execution, delivery and enforceability of all documents, and the necessary entity power with respect thereto, and (iv) that there is not any other agreement that modifies or supplements the agreements expressed in any document to which this opinion letter relates and that renders any of the opinions expressed below inconsistent with such document as so modified or supplemented. In rendering this opinion letter, we have made no inquiry, have conducted no investigation and assume no responsibility with respect to (a) the accuracy of and compliance by the parties thereto with the representations, warranties and covenants as to factual matters contained in any document or (b) the conformity of the underlying assets and related documents to the requirements of any agreement to which this opinion letter relates. The opinions expressed below with respect to the enforceability of any right or obligation under any agreement are subject to (i) general principles of equity, including concepts of materiality, reasonableness, good faith and fair dealing and the possible unavailability of specific performance and injunctive relief, regardless of whether considered in a proceeding in equity or at law, (ii) the effect of certain laws, regulations and judicial and other decisions upon the availability and enforceability of certain remedies including the remedies of specific performance and self-help and provisions purporting to waive the obligation of good faith, materiality, fair dealing, diligence, reasonableness or objection to venue or forum, to confer subject matter jurisdiction on a federal court located within the State of New York to adjudicate any controversy in any situation in which such court would not have subject matter jurisdiction, to waive the right to jury trial, to impose a penalty or forfeiture, to release, exculpate or exempt a party from, to require indemnification of a party for, liability for its own action or inaction to the extent that the action or inaction includes negligence, recklessness or willful or unlawful conduct, to sever any provision of any agreement, to restrict access to legal or equitable remedies, to establish evidentiary standards, to appoint any person or entity as the attorney-in-fact of any other person or entity, to require that any agreement may only be amended, modified or waived in writing, to provide that all rights or remedies of any party are cumulative and may be enforced in addition to any other right or remedy, to provide that the election of a particular remedy does not preclude recourse to one or more remedies, to provide that the failure to exercise or the delay in exercising rights or remedies will not operate as a waiver of any such rights or remedies, to waive rights or remedies which can not be waived as a matter of law, to provide for set-off unless there is mutuality between the parties or to provide that any agreement is to be governed by or construed in accordance with the laws of any jurisdiction other than the State of New York, (iii) bankruptcy, insolvency, receivership, reorganization, liquidation, voidable preference, fraudulent conveyance and transfer, moratorium and other similar laws affecting the rights of creditors or secured parties and (iv) public policy considerations underlying the securities laws, to the extent that such public policy considerations limit the enforceability of any provision of any agreement Impac Secured Assets Corp. Page 3. March 21, 2000 which purports or is construed to provide indemnification with respect to securities law violations. We do not express any opinion herein with respect to any law the violation of which would not have any material adverse effect on the ability of any party to perform its obligations under any agreement. However, the non-enforceability of any such provisions will not, taken as a whole, materially interfere with the practical realization of the benefits of the rights and remedies included in any such agreement which is the subject of any opinion expressed below, except for the considerations referred to in foregoing clause (iv) and the consequences of any judicial, administrative, procedural or other delay which may be imposed by, relate to or arise from applicable laws, equitable principles and interpretations thereof. Wherever we indicate that our opinion with respect to the existence or absence of facts is based on our knowledge, our opinion is based solely on the actual present knowledge of the attorneys in this firm who are directly involved in the representation of parties to the transactions described herein in connection therewith. In that regard we have conducted no special or independent investigation of factual matters in connection with this opinion letter. In rendering this opinion letter, we do not express any opinion concerning any law other than the federal laws of the United States including without limitation the Securities Act of 1933, as amended (the "1933 Act") and Sections 860A through 860G (the "REMIC Provisions") of the Internal Revenue Code of 1986 (the "Code") applicable to a real estate mortgage investment conduit ("REMIC") and applicable regulations thereunder and current judicial and administrative authority with respect thereto and the laws of the State of New York. We do not express any opinion herein with respect to any matter not specifically addressed in the opinions expressed below, including without limitation (i) any statute, regulation or provision of law of any county, municipality or other political subdivision or any agency or instrumentality thereof or (ii) the securities or tax laws of any jurisdiction. Based upon and subject to the foregoing, it is our opinion that: 1. Each Indenture, assuming the authorization, execution and delivery thereof by the parties thereto, will be a valid and legally binding agreement under the laws of the State of New York, enforceable thereunder against the parties thereto in accordance with its terms. 2. Each series of Notes, assuming the authorization, execution and authentication thereof in accordance with the Indenture and the delivery thereof and payment therefor as contemplated in the Registration Statement and the prospectus delivered in connection therewith, will be legally and validly issued and outstanding, fully paid and non-assessable and entitled to the benefits of the Indenture. 3. Each Pooling and Servicing Agreement, assuming the authorization, execution and delivery thereof by the parties thereto, will be a valid and legally binding Impac Secured Assets Corp. Page 4. March 21, 2000 agreement under the laws of the State of New York, enforceable thereunder against the parties thereto in accordance with its terms. 4. Each series of Certificates, assuming the authorization, execution and delivery of the related Pooling and Servicing Agreement, the execution and authentication of such Certificates in accordance with that Pooling and Servicing Agreement and the delivery and payment therefor as contemplated in the Registration Statement and the prospectus supplement and the prospectus contained therein delivered in connection therewith, will be legally and validly issued and outstanding, fully paid and non-assessable and entitled to the benefits of that Pooling and Servicing Agreement. 5. The description of federal income tax consequences appearing under the heading "Federal Income Tax Consequences" in the prospectus contained in the Registration Statement, while not purporting to discuss all possible federal income tax consequences of an investment in the Certificates, is accurate with respect to those tax consequences which are discussed, and we hereby adopt and confirm that description as our opinion. We hereby consent to the filing of this opinion letter as an Exhibit to the Registration Statement, and to the use of our name in the prospectus and prospectus supplement included in the Registration Statement under the headings "Federal Income Tax Consequences" and "Legal Matters", without admitting that we are "persons" within the meaning of Section 7(a) or 11(a)(4) of the 1933 Act, or "experts" within the meaning of Section 11 thereof, with respect to any portion of the Registration Statement. Very truly yours, THACHER PROFFITT & WOOD By /s/Thacher Proffitt & Wood