All lenders and CDCs should be cognizant of the loan program requirements for the assumption, assignment, and sale of SBA loans. Another option to sell a business with an SBA loan is for the buyer to assume the loan.SBA loans are fully assumable with SBA approval. The specifics of how payments will be handled and when they will begin is often handled in a separate assumption agreement between buyer and seller. Assumption of Loan Requirement Letter for disaster loan servicing action request packages. About this document and download. 41-3 Redline 11.2022. What Is Required to Assume an SBA 504 Loan? An assumable mortgage involves one borrower taking over, or assuming, another borrower's existing home loan. Find out how it works.