We've assembled a convenient checklist to help you get all your papers in order and sell your car legally and with a minimum of fuss. The California bill of sale form helps individuals document data on a transaction involving the sale, trade, or gift of personal property.You just fill out the title with their info and then make a copy or photo of it complete for your records. Below, we've outlined the steps and forms required for how to sell a car in the state of California so you can sell your car quickly for the most cash. Learn about bills of sale in California for animals, vehicles, firearms, and more.