Illinois doesn't require notarization for a bill of sale. However, it should include both the new owner and previous owner's, and the seller's report should be accurate for the document to be considered valid.
Illinois Car (Vehicle) Bill of Sale The seller's name and contact information. The buyer's name and contact information. The vehicle make, model, year, color, VIN, and odometer reading.
It is important to make sure all the requirements for the respected state law are included in the bill of sale. As, with any legal written document a bill of sale can be handwritten.