A vehicle payment plan agreement is a contract between a buyer and seller of a vehicle that agrees to installment payments. How to fill out the Payoff Request Letter Templates?Use the payment calculator to estimate monthly payments. Check out the Chase Auto Education Center to get car guidance from a trusted source. Use our free payment plan agreement form to spell out all the terms and conditions of a loan if you need to establish a payment schedule with someone. 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. 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 loan servicer is the entity that handles all billing and accepts loan payments. Set up automatic payments. With automatic payments, your payment is debited monthly from your checking or savings account.