A 10day payoff refers to the time it takes for your new lender to pay off your old loans during a refinance. 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 payoff letter provides instructions on how to pay off a loan with a lump sum before the loan term ends. Learn how payoff letters work. In this comprehensive guide, we'll explore the ins and outs of payoff letters, their purpose, and how to write one properly. Auto Loan Payoff Payments. Standard US Mail. ×. The mortgage payoff statement is a document that provides a comprehensive breakdown of the remaining balance on a mortgage. Depending on your lender, you may have to sign in to an online account, call a helpline, or send a formal letter to start the request process.