This document provides a sample payoff request letter that can be used as a guide. 1) Call the mortgage department and request an official principal payoff letter.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. Please include a per diem amount in the statement. This is an example of a payoff letter used in a syndicated loan transaction. This payoff letter (including the defined terms such as Lenders,.