A sample annotated bill of sale and assignment agreement. A bill of sale is a document of title and an assignment transfers title to another party.How to fill out the Free Printable Car Sale Contract Form? 1. Gather seller and buyer information. 2. Regardless of how you acquire a vehicle you should: check the vehicle history, transfer ownership and register your new vehicle. A major difference between partnerships and S corporations involves the treatment of distributions of appreciated property. Federal Odometer Statement. 4. Find out what documents you will need to provide proof of sale and ownership if you are buying, selling, or gifting a vehicle.