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.It typically details the principal balance, interest due as of that date, per diem, any late fees, etc. How to Complete a Satisfaction of Mortgage (3 steps). Identify the Parties; Fill and Sign; File and Record the Form. 1. 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. At Ascentra Credit Union, our motto is listening, caring, doing what's right. We're a credit union that cares and is here to help you every step of the way. However, there are some differences.