Please read this full page on any inquires about the Illinois Window Tinting Law.

Illinois Window Tint Law

Illinois Window Tint Law Enacted: 2009

HOW DARK CAN WINDOW TINT BE IN ILLINOIS?Darkness of tint is measured by Visible Light Transmission percentage (VLT%). In Illinois, this percentage refers to percentage of visible light allowed in through the combination of film and the window.
Windshield	Non-reflective tint is allowed on the top 6 inches of the windshield.
Front Door Windows	Must allow more than 35% of light in.
Back Door Windows	Must allow more than 35%, 20%, or 5% of light in.
Rear Window	Must allow more than 35%, 20%, or 5% of light in.
HOW REFLECTIVE CAN THE TINT BE IN ILLINOIS?Similar to sunglass lenses, some tinting film contain metallic elements that help in reflecting incoming light and reducing the glare and heat generated by visible light.
Front Side Windows	Must be non-reflective, state law is not specific about what this means.
Back Side Windows	Must be non-reflective, state law is not specific about what this means.
OTHER ILLINOIS RULES AND REGULATIONS
Restricted Colors	No colors of tint are explicitly banned.
Side Mirrors	Dual side mirrors are required if back window is tinted.
Certificate Requirements	Manufacturers of film do NOT need to certify the film they sell in the state.
Sticker Requirements	No sticker to identify legal tinting is required.
Medical Exemption	State allows medical exemptions for special tint. For more details about the specific terms of the exemption, consult your state law.