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.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. A 10-day payoff statement is a document from your lender that gives us the payoff amount to purchase your vehicle, including 10 days worth of interest. Hitting a loan payoff goal is one of the best financial feelings in the world. Your bank, however, has a completely different take on it. BMO Harris Bank Auto Loan Payoff Address: Standard Mailing PO Box 6201 Carol Stream IL 60197. Contact BMO Harris Bank for complete details. An auto loan payoff quote, sometimes called a 10day payoff, states how much you need to pay off the loan balance. Carvana is asking for a 10 day payoff with the full account number visible.