Chapter 1: General Registration Information. 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. Learn about bills of sale in California for animals, vehicles, firearms, and more. A California motor vehicle bill of sale is part of the vehicle registration process. Use a free template to write your own bill of sale. The California bill of sale form helps individuals document data on a transaction involving the sale, trade, or gift of personal property. How do I fill this out? Whether you're buying or selling a vehicle, boat, or personal property, our template makes it easy to set up, fill out, and sign a clear bill of sale. A motor vehicle bill of sale is between a buyer and a seller of a car, truck, or motorcycle.