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 provides instructions on how to pay off a loan with a lump sum before the loan term ends. Learn how payoff letters work. 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. Infull letter is mailed 7 business days after the loan payoff is posted to the account. Log into Online Banking, select the mortgage account you want to request the payoff quote for. Mail the funds to the address listed in the payoff letter. Wire the funds with the wiring instructions.