A payoff agreement is an informal contract in which a creditor agrees to accept the balance of a debt owed as full payment. This is an example of a payoff letter used in a syndicated loan transaction.This payoff letter (including the defined terms such as Lenders,. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. Have the loan number handy, keep in mind that if the mortgage was assigned, it might have a different number to reference. 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. A letter of explanation can clarify your financial situation and get you one step closer to qualifying for a mortgage. A letter of explanation can clarify your financial situation and get you one step closer to qualifying for a mortgage.