So now what do I do? Edit, sign, and share 10 day payoff letter sample online.No need to install software, just go to DocHub, and sign up instantly and for free. A vehicle payment plan agreement is a contract between a buyer and seller of a vehicle that agrees to installment payments. If you want to know what it will take to pay off a loan, you'll need to access a payoff statement (sometimes called a payoff letter). Your account number is at the top of your monthly statement and on the payment coupon at the bottom of the statement. Online.