A payoff letter provides instructions on how to pay off a loan with a lump sum before the loan term ends. Learn how payoff letters work.• The payment letter must disclose all monthly payments included in the mortgage payment. 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. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. Please contact one of our agents at 1(800) 255-5897 for more information. Why do I need a Payoff Letter? 5. I need to speak with a mortgage representative, why can't I come into the office like other government agencies?