Assumption of Loan Requirement Letter for disaster loan servicing action request packages. About this document and download.Complete the Application: Fill out the loan application form with accurate information. An assumable mortgage involves one borrower taking over, or assuming, another borrower's existing home loan. Find out how it works. First, the SBA does NOT lend directly to small businesses. The business has to go through a bank in order to receive funding thru SBA programs. Can An SBA 504 Loan Be Assumed? Many types of loans are not assumable. Beta.Certify.sba.gov enables Women-Owned Small Businesses (WOSBs) and Economically.