Window Tint Laws by State: How to Read VLT Limits Before You Buy

VLT, visible light transmission, is the percentage of light that passes through the glass and film combined, not the film alone. A car's factory glass already blocks some light, so a "35 percent" film on factory glass often tests a few points darker than 35 percent VLT overall. States write their laws around the combined reading, which is also how a police VLT meter checks compliance.

Lower VLT numbers mean darker glass. A 70 percent VLT law is strict because it only allows a light tint; a 20 percent VLT law is lenient because it allows a much darker film.

This is a sample across the range. Every state also sets separate rules for rear windows, reflectivity and color that do not show up in a front-window number alone, so check your specific state before booking. The full chart for all 50 states, updated for 2026 limits, is at /tools/window-tint-laws.

Almost every state follows the same basic windshield rule: a non-reflective strip is allowed above the factory AS-1 line, or within the top 4 to 6 inches if there is no AS-1 line, and that strip usually needs to meet a 70 to 88 percent VLT standard of its own depending on the state. California, for example, requires the glazing material itself to carry at least 88 percent VLT for UV-protective film placed above that line.

Reflectivity caps and color bans are nearly universal. Most states cap front window reflectivity at 20 to 35 percent and prohibit red, amber, gold or mirrored finishes outright, regardless of how light the VLT percentage is. A legally dark-enough film can still fail inspection for being too reflective or the wrong color.

Most states, including California under Vehicle Code 26708, let a driver or regular passenger use darker front window tint than the general law allows if they carry a signed letter from a licensed physician certifying a medical need to be shielded from direct sun, such as lupus or a photosensitivity condition. A dermatologist's certification can also qualify for UV-protective film exemptions in some states.

The exemption usually has conditions: the letter has to be carried in the vehicle, some states require pre-approval or a sticker, and most explicitly state that the exemption does not apply to driving after dark, since the point is sun protection, not general privacy.

Confirm your state's front, rear and windshield VLT limits, and whether your state checks the glass-plus-film reading or the film's labeled percentage alone. Texas, for instance, writes its 25 percent minimum under Transportation Code 547.613 as a combined light transmission and reflectance standard, not just a film rating.

Use /tools/window-tint-laws to pull the limit for your exact state, then use /tools/tint-percentage-simulator to see what a legal percentage actually looks like on your vehicle before you commit to a film. A reputable installer will also know the local limit, but the final ticket risk is on the driver, not the shop.

Keep a copy of your receipt or installer invoice listing the film's labeled VLT percentage. If an officer's meter reads a point or two different from the labeled percentage due to normal measurement variance, documentation showing you installed a compliant film can help resolve the stop faster.