Get Illinois bill of sale forms and learn how to transfer ownership of vehicles, boats, firearms, and other personal property from one party to another. 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.A vehicle bill of sale in Illinois is used to document the purchase and sale of a car between a private seller and a buyer. 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. You must file Form RUT-25 when you bring the vehicle into Illinois. You should attach a copy of the bill of sale or other proof of the purchase price. The Electronic Registration and Title (ERT) System allows you to complete and print an Application for Vehicle Transaction(s) (VSD 190) online.