How to fill out the Payoff Request Letter Templates? 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. A payoff letter shows the remaining balance on your mortgage, including fees, interest, etc. Learn more about what a payoff quote is and how to request one.