What should you include in your vehicle bill of sale? Yes, you need a bill of sale.State the terms and odometer reading on the BOS. Learn how to create a car bill of sale, including key components, legal protections, and tips for a smooth transaction. Completely normal request but normally you would not sign the bill of sale until money has been exchanged. An absolute bill of sale also details the form of payment. Seal vehicle deals securely. Use our free template to create a bill of sale with a promissory note for automobiles. This is the motor number or serial number required for identification purposes.