The dealer must provide a written document with the price of specified items purchased and their effect on installment payments (California Civil Code §2982). 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.Visit the California DMV's website and download a bill of sale. 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. California Bill of Sale Forms (3). A California bill of sale is an official document used to record the sale of personal property between a buyer and seller. Complete the bill of sale that is on the back of the vehicle's title after receiving all installment payments for the vehicle. Need to write a bill of sale? Click here to follow a step-by-step guide and learn the 15 key elements that must be included in 2023. The California bill of sale form helps individuals document data on a transaction involving the sale, trade, or gift of personal property.