Yes, you need a bill of sale. State the terms and odometer reading on the BOS.A car (vehicle) purchase deposit receipt is written proof that a potential buyer of a car has supplied the seller with a deposit. Carefully examine all documents before you pay for the vehicle. A bill of sale is a legal document that outlines the terms of the deal and serves as proof that the vehicle was sold. The property and improvements which the Seller is agreeing to sell and which the Purchaser is agreeing to purchase is known as. Edit, sign, and share vehicle purchase agreement with deposit online. No need to install software, just go to DocHub, and sign up instantly and for free.