How to fill out the Payoff Request Letter Templates? Put the property address and loan number on the payoff check or cover letter.Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. This is a standard form of payoff letter. What is a Payoff Agreement? A payoff agreement is an informal contract in which a creditor agrees to accept the balance of a debt owed as full payment. Always ask your lender for a final mortgage statement first. This is a standard form of payoff letter. You must request a mortgage payoff letter from your lender.