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.Customize and Download this "Bill Of Sale With Payment Plan". Selling or transferring ownership of a car, boat or other item of personal property? Easily create, print, and download a Bill of Sale in minutes. Middlesex Water offers a variety of convenient payment options that takes the hassle out of paying your bill: phone, mail or online with My H2O SmartPay. You can pay court-ordered fines and fees through the Probation Client Portal. We offer several ways to pay. You can pay your tuition online, or choose to enroll in one of our payment plans for greater flexibility. New York requires that you complete a bill of sale whenever you buy or sell a car privately.