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? 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. Are SBA 7(a) Loans Assumable? Fortunately for borrowers, SBA loans, including the SBA 7(a) loan , are fully assumable with SBA approval. A "subject to" transaction is an agreement between the seller and the buyer. Lender permission is typically required for a loan assumption. This is exciting news to me and I'm surprised I hadn't heard it before since my husband is a veteran.