The seller must complete all applicable information and sign this form. The Bill of Sale or Even-Trade Bill of Sale must be notarized.Learn about bills of sale in California for animals, vehicles, firearms, and more. Visit the California DMV's website and download a bill of sale. Learn about bill of sale requirements for the state of Missouri. Includes free Missouri bill of sale templates for cars, trucks, boats, firearms, and more. A motor vehicle bill of sale is between a buyer and a seller of a car, truck, or motorcycle. It is signed as the last step in the sales process. The bill of sale must include the buyer's and seller's names, addresses, signatures; and the purchase date, purchase price, year, make, and vehicle. The quickest and easiest way to do it might be to just accompany the buyer to the DMV and do the paperwork with them directly there.