Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started.The payoff quote will include any accrued interest and any applicable late fees, and will be valid for 10 days. Loan Account Number or VIN. 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 10 day payoff is crucial to getting your old loans paid off during a refinance. Learn how it works from start to finish. Proof of Payment vi. This amount can be in the form of a gift if the gift is documented with a gift letter provided to the first mortgage lender.