It should detail the amount due, itemizing any penalties or interest, along with any acceptable payment plans. 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. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. A mortgage payoff letter can come in two forms. One form tells borrowers the remaining principal amount and interest they have to pay to close out the loan. Payments are the result of an algebraic formula involving three variables: principal, interest rate, and term (length of the loan). Dear Lending Operations,. And Suffolk Downs to discuss plans for sports wagering.