Assumption of Loan Requirement Letter for disaster loan servicing action request packages. About this document and download.Proof of ongoing insurance on the collateral with the SBA named as mortgagee must be provided. SBA loans are fully assumable with SBA approval. Getting this approval, however, can be very complex. An assumable mortgage involves one borrower taking over, or assuming, another borrower's existing home loan. Find out how it works. In this article, we will discuss pros, cons, who qualifies, and how to fill out SBA Form 413 to get an SBA loan. Please complete the attached application and provide the following information so we can properly evaluate your loan request. I. Business items required.