Assumption of Loan Requirement Letter for disaster loan servicing action request packages. About this document and download.Assumption of SBA Loan. TurboTenant•936 views. Proof of ongoing insurance on the collateral with the SBA named as mortgagee must be provided. 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. A lender first may request payment on the SBA guaranty for loans made under most SBA loan programs following a 60day uncured delinquency. (2) Process and Underwrite: The documentation required to underwrite an assumption is the same as for a VA purchase transaction. Assuming a 504 only offers partial financing.