It serves as proof of a legal change of ownership and reflects details of the sale like the vehicle's age and condition at the time of purchase. Motor Vehicle (DMV) Bill of Sale Form Affirms the information contained in a transaction of a vehicle for a payment amount.Illinois bill of sale forms are documents that provide information about the sale, purchase, or trade of property. Use our Illinois bill of sale forms to legally buy or sell personal property in the state of Illinois, including a car, firearm, or trailer. An Illinois bill of sale details the private sale of valuable items between a buyer and a seller. An Illinois motor vehicle bill of sale legally transfers ownership of a car or other motor vehicle in the state of Illinois. Learn how to complete an Illinois Bill of Sale form with this concise guide, ensuring a legal transfer of ownership and documentation. The BOS for Motor Vehicles in Illinois. Next, access our user-friendly Illinois bill of sale template. Fill in the required fields with the gathered information.