Window tint laws are set state-by-state. That means the shade that’s fine in Texas may earn you a fix-it ticket in New York. You can technically tint as dark as you want—but if your tint measures below your state’s minimum visible light transmission (VLT) or violates other rules (windshield placement, reflectivity, labels), you can be stopped and ticketed. Most states measure VLT as the combined (net) light transmission of the glass + film.
A quick note on federal rules: Federal Motor Vehicle Safety Standard No. 205 governs glazing on new vehicles, and businesses can’t legally install aftermarket film that drops glass below the federal glazing threshold; however, federal rules don’t directly police individual owners—states do, through their own tint statutes and inspections. Bottom line: your state law is what’s enforced roadside.
The percentage of visible light that can pass through the window. Example: 70% VLT = very light tint, 20% VLT = dark tint.
A small marking etched into most windshields by the manufacturer. It indicates a horizontal line across the top of the windshield. Tinting “above the AS-1 line” means you can only apply non-reflective film in the upper strip above that line (or, if no mark is visible, the top 5–6 inches). This is often called the sun visor strip.
How much light the tint film reflects. Many states cap reflectivity between 20–35% to prevent mirrored or highly shiny films.
Some states allow darker tint if you have a medical condition requiring reduced sun exposure. These exemptions require paperwork and must usually be carried in the vehicle.
If your back window is tinted very dark, some states require you to have dual side mirrors for safety.
A few states require tint film manufacturers or installers to certify compliance, with a sticker placed between glass and film.
Window tint is one of the best upgrades you can make for comfort, privacy, and UV protection—but every state sets its own rules on how dark you can go. Understanding VLT percentages, the AS-1 line, and mirror/reflectivity requirements will help you avoid tickets and keep your vehicle road-legal.
At Ceramic Pro, we don’t just install tint—we guide you through the process to make sure your film choice balances style, performance, and compliance. Whether you’re after maximum heat rejection with our Ultimate IR films or a more subtle look with our Carbon X series, our installers ensure your tint meets both your needs and your state’s law.
Tiffany Mohasesi is the Web Content Manager at Ceramic Pro, bringing six years of experience in the automotive industry and a lifelong passion for cars. Her expertise is shaped by countless in-depth conversations with industry leaders, installers, and product specialists, giving her a unique ability to translate technical knowledge into clear, engaging content. Tiffany’s work ensures Ceramic Pro’s online presence reflects the brand’s authority, innovation, and commitment to quality in automotive protection.
