Prepare a bill of sale for the buyer. Include the date of sale and the price paid.Although some states require a bill of sale during the transaction, it is entirely optional in Illinois. 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. You are required to submit either payment of tax or proof that no tax is due before your vehicle can be titled. Currency Exchange is the way to go. This form below is designed for use on upon the sale of a motor vehicle or automobile. Sellers should attach proof of tax payment when completing the title transfer document. Create and print a valid bill of sale for automobiles form to transfer the ownership of the sold vehicles.