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Every US state has regulations on automotive window tint. The shade/darkness, reflective properties, medical exceptions, and more are regulated by the state in which you reside. Knowing these laws is important to avoid police citations and make sure your vehicle is safety compliant.
It can be difficult to stay compliant with window tint laws in a city like St. Louis, where we sit on the border between 2 states with different tint laws.
Lets dive into the differences between Missouri and Illinois Tint laws.
Missouri Tint Regulations
Missouri Tint laws are fairly straightforward. Both Passenger Cars and Truck/SUVs follow the same window tinting guidelines.

Windshield: The Front Windshield is limited to a windshield brow, which is allowed to come down to the AS-1 line. This applies to both cars and SUVs.

Front Side Windows: The front side windows are limited to 35% darkness, or VLT. This means 35% of the suns light will pass through the window tint. This 35% rule applies to both cars and SUVs.

Rear Side Windows: The rear side windows are allowed to be tinted as dark as possible. This applies to both cars and SUVs.

Rear Windshield: The rear window/windshield can be as dark as possible with no restrictions. This applies to both cars and trucks.

Medical Exceptions: Missouri law states that a driver with medical exemption is allowed to tint their vehicle to any tint darkness. A doctor letter is required for this, and must specifically state that you need tint due to X medical reason. This letter must state the drivers name, birthdate, and medical reason. This letter must be present in the vehicle at all times and be presented to police officers if requested.

Illinois Tint Regulations
Illinois tint laws are much different than Missouri’s. Passenger cars and Truck/SUV’s have different tint laws.

Windshield: The Front Windshield is limited to a 6″ brow. Whether this 6″ strip passes the AS-1 line or not does not matter, Illinois law explicitly states 6″. This applies to both cars and SUVs.

Front Side Windows: The front side windows are limited to 35% darkness on passenger cars, and 50% tint on SUVs.

Rear Side Windows: The rear side windows are limited to 35% on passenger cars, however no limitations to darkness on SUVs.

Rear Windshield: The rear window/windshield is limited to 35% on passenger cars, however no limitation to darkness on SUVs.

Medical Exceptions: Illinois law states that it allows any darkness of window tint for persons with a physician signed medical exception. However, you must apply for a specialty window tint license plate. The specialty license plate ends with the two letters, ” WT”.

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