What Is Required to Assume an SBA 504 Loan? Assumption of Loan Requirement Letter for disaster loan servicing action request packages.About this document and download. An assumable mortgage involves one borrower taking over, or assuming, another borrower's existing home loan. Find out how it works. An assumption transaction may be accomplished with or without consent of the lender. The transaction involves only a title transfer. The loan assumption process is becoming more popular as interest rates are on the rise. Has anyone had any luck with an assumption or transfer of an EIDL? I'm wanting to sell my business and have the buyer assume the loan.