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.Create a Loan Payoff Letter online and download it as a PDF or Word document. Customize and print a blank Loan Payoff Letter for free. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. Acceptable forms of payment are cash, check, or money order. In order to be timely, payment of taxes must be postmarked on or before January 31st. Look-Back Period for FHA-Insured Single Family.