An Illinois motor vehicle bill of sale documents the purchase and sale of a motor vehicle between a private seller and buyer in the State of Illinois. Motor Vehicle Bill of Sale – Use to sell, purchase and change ownership of an automobile.The Illinois bill of sale form approves the exchange of a financial consideration for an item of property into a text register. Motor Vehicle Bill of Sale Drafted upon the sale of a used vehicle to provide evidence of the transfer of ownership. Download: PDF, Word (. Basic bill of sale form in Illinois to be used as general BOS document and customize the sale contract as per your transactions and requirement. 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. If you are moving from out-of-state and registering your vehicle in Illinois, you must submit a complete Tax Form RUT-25. 2. Illinois Car (Vehicle) Bill of Sale. If you are planning to purchase or sell a vehicle in Illinois, consider using an Illinois motor vehicle bill of sale to record the transaction.