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. Instructions for completing this form: This form is divided into two sections. In this article, we will discuss pros, cons, who qualifies, and how to fill out SBA Form 413 to get an SBA loan. SBA Disaster Assistance Customer Service Center: 1-800-659-2955. Frequently Asked Questions - Post Funding. When applying for an SBA 7(a) loan, you must complete SBA Form 1919.