Assumption of Loan Requirement Letter for disaster loan servicing action request packages. About this document and download.What Is Required to Assume an SBA 504 Loan? An assumable mortgage involves one borrower taking over, or assuming, another borrower's existing home loan. Find out how it works. Loan assumption is when you take over full responsibility of the mortgage loan. Complete the assumption agreement: Fill out and sign the loan assumption agreement, which legally transfers the mortgage responsibility to you. The records must clearly indicate Minnesota Housing's ownership of each Mortgage Loan and contain the complete Minnesota Housing loan number. This guide will explore what a mortgage assumption involves, particularly in the context of a divorce, and how it can impact both parties involved. The SBA considers all credit factors before making a decision. Repayment.