Say you have a mortgage and want to know exactly how much you'd need to pay to satisfy the loan. A mortgage payoff letter will tell you that magic number.This is an example of a payoff letter used in a syndicated loan transaction. This payoff letter (including the defined terms such as Lenders,. A 10 day payoff is crucial to getting your old loans paid off during a refinance. Learn how it works from start to finish. 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. One form tells borrowers the remaining principal amount and interest they have to pay to close out the loan. If you want to know what it will take to pay off a loan, you'll need to access a payoff statement (sometimes called a payoff letter).