Customize and Download this "Bill Of Sale With Payment Plan". Vehicle Payment Plan Agreement.A vehicle payment plan agreement is a contract between a buyer and seller of a vehicle that agrees to installment payments. Seal vehicle deals securely. Use our free template to create a bill of sale with a promissory note for automobiles. Im looking to sell my car to a dealer, I just paid off the loan I had on it and I'm waiting for the lien release form from my bank. Once you click the Payment Plans link, a dropdown menu will appear and you can click Enroll in Payment Plan to set up your payment plan for the term.