Window tint darkness is measured as VLT — visible light transmission — the percentage of light that passes through the glass. A 5% film blocks 95% of light. A 70% film barely looks tinted at all. The number on the package tells you the film’s rating in isolation. What actually matters for legal compliance is the combined VLT of the film plus the factory glass it goes on, which is usually around 70–74%.
Every state sets its own limits. Front side windows (driver and passenger) are where the rules are tightest and vary the most — from 24% in Washington to 70% in New York and California. Rear windows and rear side windows are almost universally unrestricted as long as dual side mirrors are present.
Quick answer
The legal minimum VLT for front side windows is 35% in most states, but that number swings significantly depending on where you are. Find your state’s specific limit on the DMV website or check the manufacturer’s label on the bottom corner of the tinted window — shops are required to install a sticker showing the film’s VLT and their certification. The film rating alone is not enough; the combined transmittance through film plus glass must meet the state limit.
How to read a VLT rating
VLT is stated as a percentage. The higher the number, the lighter the tint. 35% VLT means 35% of visible light passes through — the glass blocks the other 65%. Factory glass on most passenger cars sits around 70–74% VLT. When you apply a 50% VLT film to 72% factory glass, the result is roughly 72% × 50% = 36% combined — just above a 35% legal minimum.
The multiplication matters. A film sold as “35%” does not automatically make your window legal in a 35% state. If your factory glass is slightly darker than standard — which happens with some manufacturer privacy glass — the combined result can fall below the threshold even with a light film.
The AS-1 line is the horizontal ceramic print band across the top of most windshields, roughly 5 inches down from the roof. Tinting is only permitted in the strip above this line on windshields, and the film must be non-reflective. Below the AS-1 line, no film is allowed in any state.
Window tint limits by state
Front side window minimums for passenger cars. Rear side and rear window limits are omitted — they are unrestricted or very permissive in every state listed. Verify with your state DMV before purchasing tint.
| State | Front side min VLT | Rear sides / rear |
|---|---|---|
| Arizona | 33% | any |
| California | 70% | any |
| Colorado | 27% | 27% |
| Florida | 28% | 15% |
| Georgia | 32% | 32% |
| Illinois | 35% | any |
| Michigan | 35% | 35% |
| Nevada | 35% | 35% |
| New Jersey | 70% | any |
| New York | 70% | any |
| Ohio | 50% | any |
| Pennsylvania | 70% | 70% |
| Tennessee | 35% | 35% |
| Texas | 25% | 25% |
| Washington | 24% | 24% |
Source: state DMV statutes as of 2025. Limits apply to the combined VLT of film plus factory glass for passenger vehicles. Medical exemptions exist in some states.
What happens if the spec is wrong
A failed inspection is the most common outcome. Most states include window tint as part of the annual safety inspection, and a meter reading below the legal threshold is a hard fail. You pay the reinspection fee, remove or replace the tint, and go back. In states without mandatory inspections, the first notice is usually a fix-it ticket — a moving violation requiring proof of correction within 30 days.
The financial math works against ignoring it. A tint citation runs $25–$150 depending on state and whether it’s a first offense. Repeat offenses in some states escalate to misdemeanor equipment violations. The tint removal itself costs $25–75 per window at a shop, or an afternoon DIY if you want to remove it yourself. Neither outcome is cheaper than checking the spec before installation.
There is also a practical safety argument. Tint darker than 20% on front side windows reduces the driver’s ability to see pedestrians at night in low-contrast situations — crosswalks with poor street lighting being the obvious case. It also reduces the ability of emergency responders to see inside a vehicle after an accident. That’s why the strictest states set their front-window limit at 70%, essentially allowing only clear film.
Sources
NHTSA — Vehicle Glazing Safety Standards
AAMVA — Window Tint Laws by State
