(2) Old supplies of certificates of sale (form MV50) should be used up before new certificates of sale are used. Our free sample car sale agreement outlines the responsibilities of both parties, payment terms and condition of vehicle transfer.1. Enter the names of the Seller and Buyer along with the agreement date. When a dealer sells a warranty, extended warranty, or service contract, the sale is subject to sales tax at the same jurisdictional rate as the tangible. This car purchase agreement template is a standard agreement made completely customizable for your individual needs. Use this free advertising agreement template next time you engage a new agency or freelancer for advertising work. Use our private car sale contract template to create a legally binding contract between the buyer and seller of a vehicle.