Many bankruptcy practitioners are familiar with the general tenet that an obligation secured only by a mortgage on the Debtor’s principal residence is immune from modification or avoidance by the Debtor. Sections 1123(b)(5) and 1322(b)(2) of the Bankruptcy Code protect residential mortgages from being “stripped-down” to the value of the subject real estate or subjecting the terms of the underlying obligation to modification.

What should be the remedy when a bankruptcy court holds that a security interest is avoidable as a preferential transfer, but the value of the security interest is not readily ascertainable? The Ninth Circuit recently addressed this issue in USAA Federal Savings Bank v. Thacker (In re: Taylors), 2010 U.S. App. LEXIS 5793 (9th Cir. 2010). The Court held that, since the value of the security interest was not readily ascertainable, the only available remedy is for the bankruptcy court to return the security interest itself, not its value, to the bankruptcy estate.