Exhibit 8.1 January 29, 1999 The Addressees Listed on Annex A Re: NovaStar Mortgage Funding Trust, Series 1999-1 Ladies and Gentlemen: We have acted as special tax counsel to NovaStar Mortgage, Inc. as to certain matters in connection with the issuance and delivery of certain asset-backed bonds denominated NovaStar Home Equity Loan Asset-Backed Bonds, Series 1999-1 Class A Bonds, Class B Bonds and Class IO Bonds (collectively, the "Bonds") pursuant to an indenture dated as of January 1, 1999 among NovaStar Mortgage Funding Trust, Series 1999-1, a Delaware business trust, as issuer (the "Issuer"), First Union National Bank, a national banking association, as bond administrator (the "Bond Administrator") and The Chase Manhattan Bank, as indenture trustee (the "Indenture Trustee"), and the Certificates pursuant to an amended and restated trust agreement (which amends the trust agreement dated [ ] between Residential Asset Funding Corporation, as depositor (the "Depositor") and Wilmington Trust Company, a Delaware banking corporation, as owner trustee (the "Owner Trustee")) dated as of January 1, 1999 (as amended from time to time, the "Trust Agreement"), among NovaStar Mortgage Funding Corporation II as the transferor (the "Transferor"), the Depositor and the Owner Trustee. As special tax counsel, we have examined such documents as we have deemed appropriate for the purposes of rendering the opinions set forth below including the following: (a) a Prospectus dated November 10, 1998 and a Prospectus Supplement dated January 27, 1999 (together the "Prospectus") with respect to the Class A Bonds, (b) an executed copy of the Indenture and the exhibits attached thereto, (c) an executed copy of the Trust Agreement and the exhibits attached thereto, and (d) other documents and matters of fact and law as we deem necessary for the purposes of the opinions expressed below. Terms capitalized herein and not otherwise defined herein shall have their respective meanings as set forth in the Indenture. In our examination we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as certified or photostatic copies and the authenticity of the originals of such latter documents. To the Parties Listed on the Attached Annex A; January 29, 1999; Page 2 Our analysis is based on the provisions of the Internal Revenue Code of 1986, as amended, and the Treasury Regulations promulgated thereunder as in effect on the date hereof and on existing judicial and administrative interpretations thereof. These authorities are subject to change and to differing interpretations, which could apply retroactively. The opinion of the special tax counsel is not binding on the courts or the Internal Revenue Service (the "IRS"). Based on the foregoing, and such investigations as we have deemed appropriate, we are of the opinion that for federal income tax purposes: 1. Assuming that (a) the Issuer created under the Trust Agreement elects, as it has covenanted to do in the Trust Agreement, to be treated as a "real estate mortgage investment conduit" ("REMIC"), as such term is defined in the Internal Revenue Code of 1986, as amended (the "Code") and (b) the parties to the Trust Agreement and the Indenture comply with the terms thereof, the Issuer will be treated as a REMIC. Subject to the above, the Bonds issued pursuant to the Indenture will be treated as "regular interests" in the REMIC and the Certificates issued pursuant to the Trust Agreement will be treated as the sole "residual interest" in the REMIC. 2. The statements under the caption "FEDERAL INCOME TAX CONSEQUENCES" in the Prospectus Supplement are accurate and complete in all material respects. 3. As a consequence of the qualification of the Issuer as a REMIC, the Bonds will be treated as "regular . . . interest(s) in a REMIC" under Section 7701(a)(19)(C) of the Code and "real estate assets" under Section 856(c) of the Code in the same proportion that the assets of the Issuer consist of qualifying assets under such sections. In addition, as a consequence of the qualification of the Issuer as a REMIC, interest on the Bonds will be treated as "interest on obligations secured by mortgages on real property" under Section 856(c) of the Code to the extent that the Bonds are treated as "real estate assets" under Section 856(c) of the Code. Our opinions contained herein are rendered only as of the date hereof, and we undertake no obligation to update this letter or the opinions contained herein after the date hereof. 2 To the Parties Listed on the Attached Annex A; January 29, 1999; Page 3 We express no opinion on any matter not discussed in this letter. This opinion is rendered as of the Closing Date, for the sole benefit of each addressee, and no other person or entity is entitled to rely hereon without our prior written consent. Copies of this opinion letter may not be furnished to any other person or entity, nor may any portion of this opinion letter be quoted, circulated or referred to in any other document, without our prior written consent. Very truly yours, /s/ Dewey Ballantine LLP 3 ANNEX A Wheat First Securities, Inc. Financial Security Assurance, Inc. acting through 350 Park Avenue First Union Capital Markets, a division of New York, New York 10022 Wheat First Securities, Inc. 301 South College Street, TW-06 Charlotte, North Carolina 28288-0610 Standard & Poor's Ratings Services The Chase Manhattan Bank 25 Broadway 450 West 33rd St. New York, New York 10004 15th Floor New York, New York 10001 NovaStar Financial Inc. Moody's Investors Service, Inc. 1901 West 47th Place, Suite 105 99 Church Street Westwood, Kansas 66205 New York, New York 10007 NovaStar Capital, Inc. NovaStar Mortgage Funding Corporation II 1901 West 47th Place, Suite 105 1901 West 47th Place, Suite 105 Westwood, Kansas 66205 Westwood, Kansas 66205 NovaStar Mortgage Inc. NovaStar Mortgage Funding Trust 1999-1 1901 West 47th Place, Suite 105 c/o Wilmington Trust Company Westwood, Kansas 66205 Rodney Square North 1100 North Market Street Wilmington, Delaware 19890-0001 Wilmington Trust Company Rodney Square North 1100 North Market Street Wilmington, Delaware 19890-0001