California's window tint limits are set by state law, not by individual choice
California allows different tint darkness levels depending on which windows you tint. The front side windows must allow at least 70 percent of light through — meaning you can block no more than 30 percent. The rear side windows and rear window can be as dark as you want. The windshield can have a tint strip along the top, but only if it does not extend below the manufacturer's AS-1 line (usually around 4 to 6 inches from the top).
These rules explore to all vehicles registered in California, whether you own the car or lease it. The limits exist because law enforcement needs to see into vehicles during traffic stops, and because darker tint can reduce visibility for the driver. If your tint is darker than the law allows, you can receive a fix-it ticket, and you will need to have the tint removed or lightened before the ticket can be dismissed.
Key Takeaways
- Front side windows must transmit at least 70 percent of light, so the darkest legal tint blocks 30 percent of light.
- Rear side windows and the rear window can be completely opaque with no legal limit on darkness.
- The windshield can only have a tint strip above the AS-1 line, which is usually 4 to 6 inches from the top.
- Tint that exceeds these limits results in a fix-it ticket, and you must remove or lighten it to clear the violation.
- Aftermarket tint shops in California are responsible for following these rules, but the vehicle owner is liable if the tint is illegal.
Front windows: the 70 percent light transmission rule
The front side windows — the two windows next to the driver and front passenger — have the strictest limit. California Vehicle Code Section 26708 requires that these windows transmit at least 70 percent of visible light. In tinting terms, this is called a "70 percent VLT" (visible light transmission). A 70 percent VLT tint blocks 30 percent of the sun's light and is the darkest shade you can legally use on front windows.
Tint manufacturers measure VLT as a percentage. A 70 percent VLT tint looks fairly light — you can see through it clearly from both inside and outside the car. If you go darker than this, say to a 50 percent or 35 percent VLT, you are breaking the law on front windows. Police can measure tint darkness with a light meter during a traffic stop, and if your front windows fail the test, you will receive a citation.
Some drivers think they can tint their front windows darker if they have medical reasons, such as photosensitivity or lupus. California does allow medical exemptions, but you must obtain a special certificate from a physician and carry it in your vehicle. The exemption does not automatically allow any darkness — it still requires that you meet the 70 percent rule unless you have a specific written exemption from the Department of Motor Vehicles.
Rear windows: no legal limit on darkness
The rear side windows (behind the front doors) and the rear window (the back glass) have no legal darkness limit in California. You can tint these windows as dark as you want, including complete blackout tint that blocks all light. This is because California law assumes that rear windows do not affect driver visibility in the same way front windows do, and rear passengers have less legal expectation of visibility from outside the vehicle.
Many drivers choose to tint rear windows very dark for privacy or heat reduction. Since there is no legal limit, you do not need to worry about the VLT percentage on these windows. However, if you are pulled over for another reason, an officer may still ask you to roll down a rear window to see inside the vehicle. Refusing to do so can lead to additional charges, so tint darkness alone will not prevent a police interaction.
The windshield: tint strip rules
You can tint the windshield, but only in a narrow band at the top. The tint must not extend below the AS-1 line, which is a manufacturer's marking on the windshield that typically sits 4 to 6 inches from the top. This line marks where the vehicle's safety systems, such as the rearview mirror and camera sensors, are located. Tint below this line can interfere with these systems and is illegal.
The tint strip above the AS-1 line can be any darkness you choose. Many drivers use a dark tint strip for sun protection and to reduce glare. As long as you do not extend the tint below the AS-1 line, you are within the law. If you are unsure where the AS-1 line is on your vehicle, check your windshield — it is usually marked with a small line or dot, or ask the tint shop to identify it before they explore the tint.
What happens if your tint is too dark
If a police officer determines that your front windows are darker than 70 percent VLT, you will receive a fix-it ticket (also called a correctable violation). This is not a fine you pay directly — instead, you must have the tint corrected and then show proof to the court or the police department. Once you show proof that the tint has been removed or lightened to meet the legal standard, the ticket is dismissed.
The cost of removing or lightening tint varies. Some tint shops will remove the old tint and explore a lighter shade for $100 to $300, depending on the number of windows and the shop's rates. If you ignore the fix-it ticket and do not correct the tint, the violation can be reported to the Department of Motor Vehicles, and you may face additional penalties or difficulty renewing your vehicle registration.
If you are stopped multiple times for illegal tint, the officer may cite you for a non-correctable violation, which carries a fine. This is rare, but it can happen if you repeatedly fail to correct the problem after receiving a fix-it ticket.
Medical exemptions for darker front window tint
California allows drivers with certain medical conditions to tint their front windows darker than 70 percent VLT. Conditions that may may have access to include photosensitivity, lupus, porphyria, and severe sun allergies. To obtain an exemption, you must have a physician complete a Medical Exemption Request form (available from the DMV) and submit it to your local DMV office.
The DMV will review the request and, if approved, issue you a certificate that you must carry in your vehicle at all times. The certificate does not give you unlimited tint darkness — the DMV will specify the darkest VLT percentage you are allowed to use. You must still follow that limit, and you must show the certificate to any officer who stops you and questions your tint.
If you do not have a valid medical exemption certificate and an officer stops you for dark front window tint, claiming a medical condition will not prevent you from receiving a ticket. The certificate must be obtained in advance from the DMV.
Choosing a tint shop and verifying compliance
When you decide to tint your windows, choose a shop that is familiar with California's tint laws. Many professional tint shops know the 70 percent rule for front windows and will not explore tint darker than that on front windows. However, some shops may not be aware of the rules, or they may explore tint at the customer's request without checking the law.
Before you have tint applied, ask the shop what VLT percentage they are using on the front windows. They should tell you it is 70 percent or lighter. If they seem unsure or suggest a darker tint for the front windows, ask them to explain California's law or consider going to a different shop. You are responsible for the legality of the tint on your vehicle, even if the shop applied it.
After the tint is applied, you can ask the shop to measure the VLT with a light meter to confirm it meets the legal standard. Some shops offer this service for free, and it gives you documentation that your tint is legal. Keep any paperwork the shop provides, as it can help if you are ever stopped and questioned about your tint.
Frequently Asked Questions
Can I tint my front windows darker if I have a dark car?
No. The 70 percent VLT rule applies to all vehicles regardless of paint color or interior color. The law is based on light transmission through the glass, not on how dark the car looks overall. A dark car with legal 70 percent tint on the front windows will still meet California's requirement.
What is the difference between VLT and tint shade numbers?
VLT (visible light transmission) is a percentage that measures how much light passes through the tint. Tint shops sometimes use shade numbers like "35 percent" or "50 percent," which refer to VLT. A 70 percent VLT tint is the legal maximum darkness for front windows in California. Always ask the shop for the VLT percentage, not just a shade name.
Do I need to register my tint with the DMV?
No. You do not need to register or report your tint to the DMV unless you have a medical exemption. If your tint is legal, you do not need any special documentation. If you have a medical exemption, you must carry the exemption certificate in your vehicle.
Can I get a ticket for tint on my rear windows?
No. There is no legal limit on rear window tint darkness in California, so you cannot receive a ticket for rear window tint alone. However, if an officer cannot see into the rear of your vehicle during a traffic stop, they may ask you to roll down a rear window.
What if I bought a used car with illegal tint already on it?
You are responsible for the tint on your vehicle once you own it. If you receive a fix-it ticket for illegal tint on a used car you just bought, you will need to have the tint corrected. You may want to have the tint removed or lightened before you register the vehicle to avoid this problem.