Assumption of Loan Requirement Letter for disaster loan servicing action request packages. About this document and download.What Is Required to Assume an SBA 504 Loan? 2) The buyer must be able to afford the monthly mortgage payments. SBA financing can offer buyers attractive loan terms and interest rates while eliminating or reducing the need for the seller to carry a note. 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. Buyer's Assumption Obligation in Asset Sales. Our office provides help with SBA services including funding programs, counseling, federal contracting certifications, and disaster recovery. This low down payment allows you to leverage your money, maximize your return on investment.