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? We will discuss what lenders (banks) look for when considering a loan and what you, the business owner, should prepare for and consider. Are SBA 7(a) Loans Assumable? Fortunately for borrowers, SBA loans, including the SBA 7(a) loan , are fully assumable with SBA approval. Crunch your own numbers with our mortgage calculators for refinance or a purchase loan, and run as many different scenarios as you'd like.