1. Read the agreement carefully to understand the obligations. Get to grips with assumption agreements.This simple guide explains their purpose, key elements, and how they affect your business dealings. THIS MORTGAGE ASSUMPTION AGREEMENT (hereinafter referred to as the. "Agreement") made and entered into as of this ______(1)______ day of ______(2). Use this lease assumption agreement template to create a document that allows you to transfer your lease to someone else legally and easily. Thinking of taking on a mortgage from a family member? Then you'll likely look into a mortgage assumption agreement. A loan assumption agreement allows them to understand what is expected from them and ensures that they are aware of their rights and legal responsibilities.