Legal Window Tint in MD: Limits, Exemptions, and Penalties

Legal window tint in Maryland must allow at least 35% of visible light to pass through, but which windows that minimum covers depends on what you drive. Passenger cars have to hit 35% on every window. Trucks, SUVs, vans, and other multipurpose vehicles only have to meet 35% on the front side windows and can go as dark as you want behind the driver. On top of the darkness rule, every vehicle faces separate restrictions on the windshield, on film color, and on reflectivity.

How Dark You Can Go By Vehicle Type

Maryland measures tint using Visible Light Transmission, or VLT, which is the percentage of outside light that passes through the glass and film combined. Higher number, lighter window.

For passenger cars and station wagons registered as Class A vehicles, the rule is simple: every window must allow at least 35% light transmission after tint.¹ That includes the rear windshield and the back seat glass. There is no legal way to go darker on the back of a sedan or coupe.

Multipurpose vehicles, light trucks, SUVs, and vans get more latitude. The front side windows next to the driver still have to meet the 35% floor. Windows behind the driver have no VLT minimum under the statute, so they can be tinted as dark as you like.¹ That is why near-opaque rear glass is common on SUVs and work vans. The same film on a four-door sedan would fail inspection.

Windshield Rules

Aftermarket tint on the windshield is prohibited below the AS-1 line or below five inches from the top of the glass, whichever measurement is smaller.² The AS-1 line is a factory marking near the top of the windshield, usually a row of small dots or the letters “AS1.” A tinted strip is allowed above it. Everything below has to stay clear.

This applies to all vehicles, including SUVs and trucks, and no medical exemption overrides it.³ Limousines face a tighter version of the rule: no aftermarket tint at all on the windshield or on the side windows next to the driver.² School vehicles cannot have aftermarket tint on any window.

Banned Colors and Reflective Films

Three film types are illegal on every vehicle, regardless of how light or dark the VLT reading is:

Mirrored, one-way, chrome, metallic, or sparkling finishes that reflect light back at other drivers.
Red, yellow, or amber film, which can distort the appearance of brake lights and traffic signals.
Color-shifting film that turns red, yellow, or amber under different lighting, even if it looks neutral when you buy it.

All three prohibitions are set by COMAR 11.14.02.14, and an inspection station must reject a vehicle displaying any of them.² A medical exemption does not override color or reflectivity restrictions.³

Medical Exemption for Darker Tint

If you or a regular passenger have a medical condition that requires extra sun protection, Maryland allows tint darker than 35% VLT through a formal exemption. The certification must come from a physician licensed to practice medicine in Maryland and must follow the format required by the Automotive Safety Enforcement Division (ASED) of the Department of State Police.³ A letter from an optometrist does not satisfy the statute. Qualifying conditions commonly include severe photosensitivity and lupus. The original signed certification has to be in the vehicle whenever it is on the road; if you cannot produce it at a stop, you can be cited as if the tint were fully illegal.

As of October 1, 2025, Maryland eliminated the old two-year expiration on these certifications. The physician now sets the validity period based on the condition, and if the condition is permanent, the certification is valid indefinitely.³ Before that change, every exempt driver had to return to a doctor every two years regardless of whether the condition was chronic.

The waiver only relaxes the VLT percentage on side and rear windows. It does not let you tint the windshield below the AS-1 line, and it does not override the ban on mirrored, red, yellow, or amber films.³

What Happens If Your Tint Is Too Dark

When an officer sees tint that looks illegal, the usual enforcement step is a safety equipment repair order. You get 10 days to have the tint corrected at a shop of your choice.⁴

Ignoring the order gets expensive. If you fail to comply within 30 days, the state suspends your vehicle’s registration.⁴ A suspended registration means you cannot legally drive the vehicle or renew the plates. You have to return the plates to the MVA within 10 days, or an officer can confiscate them on the spot.⁵ To get the registration back, you need proof the tint has been corrected.

Removing the film yourself does not close out a repair order. The correction must be certified at a licensed inspection station.⁵ A much heavier penalty applies if you re-tint or alter the glass after your vehicle has already been inspected and certified as compliant. Under Maryland Transportation Code § 23-109(j), that can bring a fine of up to $500, up to six months in jail, or both.⁶

How Tint Gets Measured

Inspection mechanics and officers verify VLT using handheld electronic tint meters that shine light through the glass and film together and read how much passes through. The result is recorded for each regulated window on a standardized form.⁶

The meters are accurate to plus or minus two percentage points. A reading of 34% could reflect a true VLT between 32% and 36%, and the margin runs both directions. Aiming for exactly 35% is risky for that reason. A careful installer targets a few points above the minimum so that dirt, aging film, or factory-tinted glass does not push you under.

If You Drive a Commercial Vehicle

Commercial motor vehicles are governed by a stricter federal rule that overrides the state 35% figure on the front windows. Under 49 CFR § 393.60, the windshield and the side windows next to the driver must allow at least 70% light transmission.⁷ That leaves almost no room for aftermarket tint on the front of a commercial truck or bus. Windows behind the driver are not restricted by the federal rule.

Before You Pick a Shade

Factory glass usually carries a slight tint from the manufacturer that blocks somewhere between 15% and 25% of light before any film is added. The final VLT is the combined reading. If your factory glass transmits 80% and you add a 45% VLT film, the combined measurement will land around 36%, barely legal. Ask the installer to measure the factory glass first and calculate the combined VLT before you commit to a film shade.

Film type matters for electronics. Metallic-based films can interfere with GPS, cellular, and radio signals because the metal particles block electromagnetic waves. Ceramic films use non-metallic particles and provide similar heat rejection without that interference. If you rely on navigation or have a toll transponder on the windshield, ceramic is worth the extra cost.

Insurance can also come into play. If your tint is illegally dark and you are in a collision, your insurer may refuse to cover damage to the non-compliant windows. A tint citation on your driving record can affect your rates the same way other equipment violations do.

1
Justia. Maryland Code Transportation 22-406 – Safety Glass
2
Library of Maryland Regulations. COMAR 11.14.02.14 – Vehicle Glazing
3
Maryland General Assembly. Maryland Code Transportation 22-406 – Medical Exemption for Enhanced Tinted Windows
4
Maryland General Assembly. Maryland Transportation Code 23-105 – Safety Equipment Repair Orders
5
Maryland Department of State Police. Complying With a Safety Equipment Repair Order
6
Maryland Department of State Police. Window Tint Inspection Report
7
eCFR. 49 CFR 393.60 – Glazing in Specified Openings