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Begin by labeling the receipt as "Bill of Sale" and list the date of the transaction. Identify all the pertinent identification for your car so there's no confusion about what's being sold. Write the car make, model, registration number and mileage on the face of the receipt. If there are any other unique or important features about the car, note them here. For example, this is a good place to mention any car damage or missing features, like a spoiler that was removed or an antenna that was ripped off.
Without the correct paperwork, the buyer is going to have a tough time re-registering the car in his name. Allot a space on the receipt to confirm necessary documents have been exchanged. List out the crucial documents -- at a minimum, the completed registration document and vehicle title -- and mark "yes" when you've exchanged the information.
Include a paragraph in the receipt that states you are selling the vehicle and list the agreed-upon sales price. It's important include a "sold as seen, tried and approved without guarantee" clause in this paragraph. This means that the seller isn't promising a vehicle other than what both parties have seen and the seller isn't guaranteeing future performance. However, even with this clause, it's not legal to sell a car known to be unroadworthy.
Buyer and Seller Information
Create two paragraphs at the bottom of the receipt dedicated to the seller and the buyer. Leave a space for each individual to print his name, sign the receipt and write in his address and phone number. Make a copy of the completed receipt for both the buyer and the seller. The buyer will need it to show proof of ownership to the DMV and the seller should retain a copy as evidence for any potential legal disputes.