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.What Is a Letter of Explanation? A letter of explanation is a document that the lender may request to learn more about your specific financial situation. Return completed form to: Utah Housing Corporation. 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. This form is a statement of final loan terms and closing costs. 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.