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? Are SBA 7(a) Loans Assumable? Fortunately for borrowers, SBA loans, including the SBA 7(a) loan , are fully assumable with SBA approval. The home shall be the primary residence of the home buyer or home owner who assumes the AHC grant enforcement note and mortgage. Assumptions are a credit qualifying transaction, so if you were denied they should be sending you a notice of denial with the reason. An assumable mortgage involves one borrower taking over, or assuming, another borrower's existing home loan. Find out how it works. You should approach a mortgage assumption in a similar fashion as buying a house with traditional financing.