Find out what documents you will need to provide proof of sale and ownership if you are buying, selling, or gifting a vehicle. We will be addressing how to fill out a bill of sale form for the sale of a car so let's get started with this guide to filling out a bill of sale form.Learn about New York bills of sale for vehicles, boats, firearms, and more. Get answers to frequently asked questions and download the templates you need. VEHICLE BILL OF SALE dmv.ny.gov. SELLER. A detailed description of the process of writing a bill of sale when transferring ownership of a car to a buyer. Affidavit of Motor Vehicle Gift Transfer. Program information (e.g. In the state of New York, you need a bill of sale when transferring ownership of a boat or motor vehicle. How do I get a refund?