Illinois tint rules at a glance
- Front side windows
- 35%
- Minimum VLT, film and glass together
- Back side windows
- 35%
- Minimum VLT, film and glass together
- Rear window
- 35%
- Minimum VLT, film and glass together
- Windshield
- Nonreflective tint only on the top 6 inches of the windshield.
- Reflectivity
- All permitted film must be nonreflective; no numeric limit is given.
- Medical exemption
- Yes, with documentation
- Sticker or certificate
- Not required
- Two outside mirrors
- Required when the rear window is tinted
- Penalty
- Petty offense, $50 to $500 for a first violation; later violations are Class C misdemeanors at $100 to $500, and the court orders the windows corrected (625 ILCS 5/12-503(j)).
VLT is the share of light the glass lets through, film and glass together. Source: 625 ILCS 5/12-503, checked Nov 5, 2026. Laws change; confirm with the statute before tinting.
Illinois regulates window tint through 625 ILCS 5/12-503. Below: the minimum visible light transmission (VLT) for each window, the windshield rule, what counts as too reflective, who can get a medical exemption, and how an officer checks a car at the roadside.
Legal tint limits in Illinois
- Front side windows: at least 35% VLT.
- Back side windows: at least 35% VLT.
- Rear window: at least 35% VLT.
VLT is measured through film and glass together. Factory glass already blocks some light, usually landing between 70% and 80% VLT before any film, so a roll sold as "35%" on a window that started at 75% ends up darker than 35% once installed. Officers meter the finished window, not the box the film came in.
Windshield
Nonreflective tint only on the top 6 inches of the windshield.
Federal standard FMVSS 205 sets the baseline for the glass itself: the windshield and front side windows of a new car must transmit at least 70% of visible light. State law decides what film may be added afterwards, which is why the windshield rule is usually a strip above the AS-1 line rather than a percentage.
Reflective and colored film
All permitted film must be nonreflective; no numeric limit is given. No film colors are singled out.
Medical exemptions
Illinois allows darker tint with a medical exemption. An Illinois-licensed physician's certified letter rides in the car, a copy goes to the Secretary of State (form VSD 704), renewal is every 4 years, and the car must display tinted-window plates or a plate sticker.
Stickers, mirrors and enforcement
No sticker or certificate is required for legal tint. If the rear window is tinted, the car must have outside mirrors on both sides. Petty offense, $50 to $500 for a first violation; later violations are Class C misdemeanors at $100 to $500, and the court orders the windows corrected (625 ILCS 5/12-503(j)).
In practice
Illinois ties the front side windows to what is behind the driver: 35% in front when every rear window is at least 35%, or 50% in front when every rear window is at least 30%. Vehicles with factory privacy glass behind the driver may use 50% film in front, the rule many charts call the SUV rule; the statute has no body-type categories. Officers allow a 5-point meter variance. If the front side windows are untreated the statute sets no number for the rear glass, but any treated rear window requires a side mirror on each side. No medical exemption covers conditions sunglasses can manage.
Sources
Checked Nov 5, 2026. Laws change; confirm with the statute before tinting.
Common questions about tint in Illinois
Is 35% tint legal on front windows in Illinois?
Yes. 35% is the darkest Illinois allows on front side windows: the glass and film together must let at least 35% of visible light through. Anything darker fails a meter check.
Can I tint my windshield in Illinois?
Nonreflective tint only on the top 6 inches of the windshield. Film below that line is not permitted for ordinary drivers.
Does Illinois allow darker tint for medical reasons?
Yes, with documentation. An Illinois-licensed physician's certified letter rides in the car, a copy goes to the Secretary of State (form VSD 704), renewal is every 4 years, and the car must display tinted-window plates or a plate sticker.
What happens if my tint is too dark in Illinois?
Petty offense, $50 to $500 for a first violation; later violations are Class C misdemeanors at $100 to $500, and the court orders the windows corrected (625 ILCS 5/12-503(j)).
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