California's window tint limits are measured in visible light transmission, and the law sets different limits for different windows
California law allows window tinting, but only up to a certain darkness level on each window of your car. The state measures tint darkness using visible light transmission (VLT), which is the percentage of light that passes through the tinted glass. The darker the tint, the lower the VLT percentage. California's limits depend on which windows you are tinting.
For the windshield, you can tint only the top 4 inches, and that strip must allow at least 70% of light through. For the front side windows (the windows next to the driver and front passenger), you must allow at least 70% of light through. For the rear side windows and rear windshield, you can go darker — you must allow at least 20% of light through. This means your back windows can be much darker than your front windows.
California also requires that any tint you use be non-reflective. Reflective or mirrored tints are not permitted, even if they meet the darkness requirements. The goal is to keep drivers and law enforcement able to see into the vehicle for safety reasons.
Key Takeaways
- The windshield can only be tinted on the top 4 inches and must allow at least 70% of light through.
- Front side windows must allow at least 70% of light through, the same as the windshield strip.
- Rear side windows and the rear windshield can be much darker, requiring only 20% light transmission.
- All tint must be non-reflective; mirrored or shiny tints are illegal regardless of how dark they are.
- Violations can result in a fix-it ticket, meaning you have time to remove or adjust the tint before facing a fine.
How the VLT percentage works in practice
VLT is not something you measure yourself — it is a technical specification that comes with the tint film you buy. When you purchase window tint from a shop, the product is labeled with its VLT percentage. A 70% VLT tint lets 70% of light through and blocks 30%. A 20% VLT tint lets only 20% of light through and blocks 80%, making it much darker.
The reason California uses VLT instead of a vague term like "dark" or "light" is that it is measurable and consistent. A police officer with a light meter can check whether your tint meets the law. If you buy tint labeled as 70% VLT for your front windows or 20% VLT for your rear windows, you are within the law. If you buy something darker — say, 50% VLT for a front window — you are breaking the law, even if it does not look that dark to your eye.
What happens if your tint is too dark
If a police officer stops you and measures your tint with a light meter, they can issue you a citation. In California, an illegal window tint violation is typically a non-moving violation, which means it does not add points to your driving record. However, you will usually receive a fix-it ticket, formally called a "notice to correct a violation."
A fix-it ticket gives you a set amount of time — usually 10 days to a few weeks, depending on the officer and the county — to remove or adjust the tint and then show proof to the court or a police station that you have corrected it. If you fix the problem within that window and provide proof, the ticket is dismissed and you pay no fine. If you do not fix it or do not provide proof, you face a fine that can range from $25 to $100 or more, depending on your county.
The key point is that you have a chance to fix the problem before a fine becomes final. This is different from a moving violation, which stays on your record. That said, it is still better to get the tint right from the start rather than risk a stop and a ticket.
Exceptions and special cases
California law includes a few exceptions to the standard tint rules. If you have a medical condition that makes you sensitive to sunlight, you may be able to get a medical exemption that allows darker tint on your front side windows. To do this, you need a written statement from a licensed physician explaining the medical need. You then explore for a medical exemption certificate from the California Department of Motor Vehicles (DMV). With this certificate in your vehicle, you can legally use darker tint on your front windows.
Additionally, some vehicles come from the factory with tinted rear windows. Factory tint is legal regardless of how dark it is, because the manufacturer must comply with federal safety standards. You cannot be cited for factory tint, even if it is darker than the legal limit for aftermarket tint. The law applies only to tint you add yourself or have added by a shop.
Where to get legal tint installed
Many car window tinting shops in California know the state law and will install tint that meets the legal limits. When you go to a shop, tell them you want tint that complies with California law, and specify which windows you want tinted. A reputable shop will use film labeled with the correct VLT percentage for each window and will not install anything darker than the law allows.
If you are buying tint film to install yourself, check the product label for the VLT percentage and match it to California's limits: 70% for the windshield strip and front side windows, 20% for rear windows. Some online retailers and auto parts stores sell tint that is too dark for California, so always verify the VLT before you buy.
Keep your receipt or documentation showing the VLT of the tint you installed. If you are ever stopped and cited, this documentation can help prove that you installed legal tint, in case there is a dispute about the measurement.
Other states have different rules
If you drive across state lines, keep in mind that every state has its own window tint law, and they are not all the same. Nevada, Arizona, and other neighboring states have different VLT limits than California. Some states are more permissive; others are stricter. If you have tint that is legal in California but you drive to another state, you could be cited there. Before a road trip, check the tint laws of any state you plan to visit.
Similarly, if you move to California from another state and your vehicle already has tint that was legal where you came from, it may not be legal here. You would need to have the tint adjusted or removed to comply with California law.
Frequently Asked Questions
Can I tint my windshield all the way across, or just the top?
Only the top 4 inches of the windshield can be tinted in California. The rest of the windshield must remain clear. This rule exists so that drivers can see the road and other vehicles clearly.
Is 35% VLT legal for my front windows in California?
No. Front side windows must allow at least 70% of light through, so 35% VLT is too dark and illegal. You would need to use 70% VLT or lighter for front windows. Rear windows can be 20% VLT or lighter.
What if I have a medical reason for darker tint?
You can request a medical exemption from the California DMV with a letter from a licensed physician explaining your condition. Once approved, you receive a certificate to keep in your vehicle that allows you to use darker tint on your front side windows legally.
Do I need to remove tint if I buy a used car with illegal tint?
Yes. Once you own the vehicle, you are responsible for its compliance with California law. If the tint is too dark, you should have it removed or adjusted. If you are stopped by police, the fact that the tint was already on the car when you bought it is not a legal defense.
Can I get a ticket for factory tint that is darker than the legal limit?
No. Factory tint installed by the manufacturer is always legal in California, even if it is darker than the limits for aftermarket tint. The law only restricts tint you add after purchase.