Learn about how to assume a home loan, the authorization forms mortgage holders will need to sign, the assumption process, and much more. All parties involved must sign a written agreement that specifies the terms of the assumption.How is a loan assumption documented? This guide breaks down the essential steps, documents, and lender requirements for a smooth transfer. This document is a mortgage assumption agreement between an original borrower, lender, and new borrower. Documentary stamp taxes are payable on a mortgage assumption agreement only when the original mortgagor is released. The name of the person or company that you are looking for.