Mortgage lenders ask for a letter of explanation to better understand your finances when determining whether to approve you for a loan. 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 note that some mortgage lenders require a 7-10 day processing time to generate your final payoff letter. What is a Payoff Agreement? A payoff agreement is an informal contract in which a creditor agrees to accept the balance of a debt owed as full payment. To get a payoff letter, ask your mortgage lender for an official payoff statement and let them know what the projected closing date is. 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.