Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started.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. 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. A Satisfaction of Security Instrument is a document that shows an individual has paid a deed of trust or a mortgage in full. Comments: For payoffs, include mortgage loan number, borrower name(s), and property address.