What Is the Legal Window Tint in Texas? VLT, AS-1 Line, and Penalties

The legal window tint in Texas allows front side windows to transmit at least 25% of visible light through the glass and film combined, limits windshield tint to the strip above the AS-1 line, and places no darkness restriction on rear side windows or the back window as long as the vehicle has a side mirror on each side. The rules sit in Texas Transportation Code Section 547.613 and Texas Administrative Code Rule 21.3, and breaking them is a misdemeanor that can also fail your annual safety inspection.¹

Front Side Windows: The 25% Rule

The windows next to the driver and front passenger are where Texas draws its firmest line. Film applied there must let through at least 25% Visible Light Transmission (VLT), measured on the glass and film together.¹

That combined measurement trips people up. Factory automotive glass already blocks some light before any film goes on, so a film rated 35% on the roll can read below 25% once it’s applied. A good installer measures the finished result, not the box.

Windshield Tint and the AS-1 Line

The windshield gets the strictest treatment because anything blocking the forward view is the clearest safety risk. Tint film can only go above the AS-1 line, the mark etched into the glass by the manufacturer. If the windshield has no visible AS-1 line, the tint cannot drop more than five inches below the top of the glass, whichever is closer to the top.¹

Film inside that upper strip still has to meet the 25% VLT and 25% maximum reflectance limits, and it cannot be red, blue, or amber. One exception matters: clear, untinted UV-blocking film is allowed anywhere on the entire windshield without a medical exemption, because it stops ultraviolet rays without visibly darkening the glass.²

Rear Side Windows and the Back Window

Behind the driver, the rules relax. Side windows behind the front seats have no VLT restriction under state law, so any darkness is fair game, including full blackout film.¹

The back windshield can be tinted to any darkness too, on one condition: the vehicle must have an outside mirror on each side that shows at least 200 feet of roadway behind it. Nearly every passenger vehicle meets that from the factory. If a vehicle is missing one of those mirrors, the rear window has to meet the same 25% VLT and 25% reflectance limits as the front side windows.²

Color and Reflectivity Limits

On the windshield and both front side windows, luminous reflectance cannot exceed 25%. High-metallic films that give a mirror finish can throw dangerous glare at other drivers, especially at low sun angles.¹

Red, blue, and amber tint is banned on every window of the vehicle, including the windshield. Those colors are reserved for emergency vehicle lighting.²

Medical Exemptions for Darker Tint

Drivers with a medical reason to limit sun exposure, such as lupus or severe photosensitivity, can apply film darker than 25% VLT to the front side windows. Qualifying takes a signed statement from a licensed physician or optometrist that identifies the specific driver or vehicle occupant and confirms that darker tint is medically necessary.²

Keep the signed statement in the vehicle and present it at traffic stops and at inspection. The exemption follows the person, not the car, so it does not transfer if you sell the vehicle.

One trap: a passed inspection with a medical exemption does not shield you from a ticket. The DPS states plainly that the inspection pass is not itself proof of the condition, and whether a violation stands is left to law enforcement and the courts.³

Penalties and the Fix-It Dismissal

Driving with illegal tint is a misdemeanor under Section 547.613. For drivers, it is a fine-only offense carrying penalties up to $500 plus court costs. Installers face a separate penalty of up to $1,000 for failing to attach the required compliance label.¹

There’s a way out. Under Texas Transportation Code Section 547.004, a court may dismiss a vehicle equipment charge if you fix the problem before your first court appearance and pay a reimbursement fee of no more than $10. In practice, that means removing or replacing the illegal film, keeping proof, and bringing it to court. The dismissal is not available for commercial motor vehicles.⁴

Failing Your Safety Inspection

You don’t need a traffic stop to get caught. Window tint is checked at the annual state safety inspection, and the vehicle fails if the front side windows read below 25% VLT, regardless of model year. Inspectors use handheld light meters that measure through the glass.²

If you fail, the non-compliant film has to come off or be replaced before the vehicle can pass. If you’re relying on a medical exemption, hand the signed physician’s statement to the inspector at the time of inspection.

Commercial Vehicles Follow a Stricter Federal Rule

Commercial motor vehicles don’t get Texas’s permissive standard on the forward windows. Under 49 CFR Section 393.60, the windshield and the windows to the immediate left and right of the driver must transmit at least 70% of light, which is nearly three times what Texas requires on a passenger car. Other windows on a commercial vehicle are not restricted by the federal rule.⁵

And because the Section 547.004 fix-it dismissal does not apply to commercial vehicles, there is no correcting your way out after the citation. For a commercial vehicle operating in Texas, leaving the windshield and front side windows clear of aftermarket film is the safest route.

1
State of Texas. Texas Transportation Code TRANSP 547.613 – Restrictions on Windows
2
Department of Public Safety. Window Tinting Standards
3
Texas Department of Public Safety. Notice Window Tint Medical Exemption
4
Texas Public Law. Texas Transportation Code 547.004 – General Offenses
5
eCFR. 49 CFR 393.60 – Glazing in Specified Openings