How to fill out the Payoff Request Letter Templates? A 10 day payoff is crucial to getting your old loans paid off during a refinance.Learn how it works from start to finish. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. Filling out this form is straightforward. 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. Fears: – He'll spend all his money. – She could be taken advantage of.