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.The Vehicle Payoff Sample Letter form is a crucial document for individuals aiming to transfer their vehicle loan to the State Department Federal Credit Union. An auto loan payoff letter is just a way to prove that you have paid in full for a car. If you are selling your vehicle, often the buyer will ask to. A lender's payoff statement or letter will show the amount you need to pay to completely close out the loan. Getting the payoff quote is simple. You can contact your lender via telephone, visit them in person, or go online and request a payoff amount.