Vehicle Law · Window Tint
Window Tint Laws in Massachusetts
The exact legal darkness allowed on every window of your vehicle in Massachusetts, plus reflection limits, the medical exemption, and what a ticket costs.
How dark you can legally go
Visible-light transmission (VLT) allowed for each window.
Common tint shades, and whether they're legal here
What the shop sells, mapped to the Massachusetts limit.
| Film shade | Front side | Back & rear |
|---|---|---|
| 70% (light) | Legal | Legal |
| 50% | Legal | Legal |
| 35% (factory look) | Legal | Legal |
| 20% | Too dark | Too dark |
| 5% (limo) | Too dark | Too dark |
Massachusetts regulates all five pieces of glass at 35% and adds no vehicle-class exception; a tinted rear window also requires two outside mirrors.
Film is sold by its own VLT, but police measure the installed darkness: the film combined with your factory glass. Ask the shop for the net, as-installed VLT before you buy.
The full rules, with the statute
Every limit and where it comes from in the code.
| Rule / window | Legal limit in Massachusetts | Statute |
|---|---|---|
| Windshield | Tint or reflective material may not extend lower than 6 inches from the top of the windshield, or below the AS-1 markings on the left or right side, whichever applies | 540 CMR 4.04(8)(g) |
| Front side | At least 35% light transmittance on the driver and passenger front side windows | §9D; 540 CMR 4.04(8)(g) |
| Back side | At least 35% on the side windows behind the driver and passenger; no darker allowance for any vehicle class | §9D; 540 CMR 4.04(8)(g) |
| Rear window | At least 35% on the rear window, and the vehicle must have two outside rear-view mirrors when the rear window carries aftermarket tint | §9D; 540 CMR 4.04(8)(g) |
| SUV / van rear | No SUV or van exception; the 35% floor applies to the same five pieces of glass on every vehicle, so the rear windows are never allowed to go darker | §9D; 540 CMR 4.04(8)(g) |
| Reflection | Total visible light reflectance may not exceed 35% on the regulated windows | §9D |
| Banned colors | Not specified in the statute; §9D and 540 CMR 4.04(8)(g) set VLT and reflectance limits but name no prohibited colors | §9D |
| Medical exemption | AllowedAvailable (details in the medical exemption section below). | §9D; 540 CMR 4.04(8)(g) |
| Meter tolerance | Not specified in statute; the inspection rule fails a reading under 35% without a stated meter tolerance | 540 CMR 4.04(8)(g) |
Penalties & how it's enforced
What happens if your tint is too dark.
M.G.L. c.90 §9D (no pending amendment): No recent change to the tint limits. The 35% VLT floor, the 35% reflectance cap, and the 6-inch/AS-1 windshield rule remain as set by M.G.L. c.90 §9D and the RMV inspection standard.
The medical exemption: how to qualify
For drivers with a documented light-sensitivity condition.
What Massachusetts drivers get wrong
Massachusetts keeps it uniform: every window that matters, the two front doors, the two windows behind them, and the rear windshield, has to allow at least 35% of light, with no SUV or van loophole for darker rear glass. Reflectance is capped at 35% too, so mirror-look film is out. The windshield takes tint only in the top 6 inches or above the AS-1 mark, a tinted rear window means the car needs two outside mirrors, and the whole thing is checked at the annual safety inspection.
Common questions
What is the legal tint percentage in Massachusetts?
At least 35% VLT on all five regulated pieces of glass: both front side windows, both windows behind them, and the rear windshield (M.G.L. c.90 §9D; 540 CMR 4.04(8)(g)). Reflectance may not top 35% either.
Can SUVs and vans have darker rear windows in Massachusetts?
No. Unlike many states, Massachusetts gives no vehicle-class exception. The 35% floor applies to the same five pieces of glass on every vehicle, so rear side and rear windows can never go darker than 35%.
What is the fine for illegal tint in Massachusetts?
Up to $250 per violation. On a third or subsequent conviction, the Registrar suspends the operator’s license for up to 90 days (M.G.L. c.90 §9D). Illegal tint also fails the annual safety inspection.
Is there a medical exemption for tint in Massachusetts?
Yes. MassDOT/RMV issues a Tinted Glass Medical Waiver when a physician certifies the operator as photophobic or photosensitive (RMV form 21858), which exempts the vehicle from the standard limits.
Not legal advicePlainStatute provides plain-language summaries of public law for general information only. This is not legal advice. Statutes change; always confirm current requirements with the official source linked above before acting.