The primary purpose of a bill of sale is to confirm the terms and provide evidence of the transaction between the seller and buyer. Learn about bills of sale in Massachusetts for cars, boats, firearms, and more.Bill of Sale: A written statement detailing the sale, including the vehicle's make, model, year, VIN, sale price, and date of sale. 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. Learn about bill of sale laws and requirements for the state of Texas. Get templates for buying and selling high-value items like cars, boats, and firearms. You definitely need one if you don't have a title but everyone online seems to say you do not of you have the title. If you know you are buying the car for sure, bring the bill of sale or title to the DMV and bring the plate to the other state. If you've purchased a vehicle from an individual, you will need to apply for registration in order to drive it in Massachusetts legally.