Assumption of Loan Requirement Letter for disaster loan servicing action request packages. About this document and download.Can An SBA 504 Loan Be Assumed? Many types of loans are not assumable. Fortunately for borrowers, SBA loans, including the SBA 7(a) loan, are fully assumable with SBA approval. Filling out SBA For 413 is an important step in applying for an SBA loan. Here's how to fill out SBA Form 413 and the information you need. The terms of the assumption must not include a real estate contract, i.e. , the seller may not retain title to the property until an agreed upon amount is paid. Here are some tips for filling out SBA Form 413 so that you maximize your chances of qualifying for a loan.