California's window tint rules are stricter than most states, and the penalties for breaking them are real
California allows tinted windows, but only on specific parts of your car and only if the tint lets through a minimum amount of light. The front windshield cannot be tinted at all except for a small strip at the very top. The front side windows must allow at least 70 percent of outside light to pass through. The rear side windows and rear windshield can be as dark as you want. If your tint is darker than the law allows, you can receive a fix-it ticket, which means you have a set time to remove or lighten the tint and show proof to the court. If you do not fix it, the ticket becomes a moving violation on your record.
The reason for these rules is visibility and safety. Police need to see into vehicles during traffic stops, and other drivers need to see pedestrians and cyclists near your car. California's Vehicle Code Section 26708 sets these standards, and they explore to every vehicle registered in the state, whether you tinted it yourself or bought the car already tinted.
Key Takeaways
- Your front windshield cannot have any tint except a non-reflective strip at the top, and your front side windows must transmit at least 70 percent of light.
- Rear side windows and rear windshield can be tinted as dark as you want under California law.
- A fix-it ticket gives you time to remove or lighten illegal tint and show proof to the court, but ignoring it turns it into a moving violation.
- Medical exemptions for light-sensitive conditions exist but require a signed letter from a licensed physician and a special sticker on your vehicle.
What the light transmission percentage actually means
Light transmission is the percentage of outside light that passes through your window glass and tint combined. A 70 percent transmission requirement means 70 percent of the sun's light must reach the inside of your car. The remaining 30 percent is blocked by the tint, the glass itself, or both.
When you buy tint, the label usually shows the Visible Light Transmission (VLT) percentage. If you are buying aftermarket tint for your front side windows, you need to choose a product rated at 70 percent VLT or higher. Many people misunderstand this and think they can use 30 percent tint (which blocks 70 percent of light) on the front, but that is backwards and illegal in California.
The rear windows have no minimum transmission requirement, so you can use any darkness you want. Some people use 5 percent tint on the rear, which blocks 95 percent of light and creates a nearly opaque appearance.
The windshield and top strip exception
Your front windshield can have a non-reflective tint strip along the top, but only if it does not extend more than four inches below the top of the windshield or to the point where the windshield wipers reach, whichever is shorter. This strip is meant to reduce glare from the sun and does not need to meet a specific light transmission standard as long as it is not reflective.
Many aftermarket tint shops know this rule and will install a top strip as part of a package. If you are having tint installed, ask the shop to confirm they understand California's windshield rules before they start work. Some shops that operate across state lines may default to rules from other states and install illegal windshield tint by mistake.
Medical exemptions and how to get one
If you have a medical condition that makes you sensitive to light—such as lupus, porphyria, or severe photophobia—you may be able to use darker tint on your front windows. To do this, you need a signed letter from a licensed physician stating that you have a condition requiring protection from sunlight. The letter must be on the doctor's letterhead and include their license number.
Once you have the letter, take it to your local California Department of Motor Vehicles (DMV) office along with your vehicle registration and proof of identity. The DMV will issue you a special medical exemption sticker that you place on your vehicle. This sticker tells law enforcement that your darker tint is legal under the exemption. Without the sticker, even with the letter in your car, you can still receive a ticket. The exemption does not let you tint your front windshield—only your front side windows can be darker under a medical exemption.
What happens if you get a ticket for illegal tint
If a police officer stops you and determines your tint is darker than California law allows, they will typically issue a fix-it ticket, also called a correctable violation. The ticket will have a date by which you must correct the problem—usually 10 days to a few weeks depending on the officer's discretion. You then have two options: remove the tint entirely or have it replaced with legal tint that meets the transmission requirements.
After you fix the tint, you must show proof to the court. This usually means taking your vehicle to a certified tint shop or mechanic who can measure the light transmission and provide a written statement, or you can take your car to a police station where an officer can verify the tint is now legal. You then bring this proof to the court by the important date on the ticket. If you do this, the ticket is dismissed and nothing goes on your driving record.
If you ignore the fix-it ticket and do not show proof by the important date, the violation becomes a moving violation. This means a fine (which varies by county but is typically $100 to $250 or more), points on your driving record, and a potential increase in your insurance rates. A moving violation also stays on your record for three years.
How to measure your tint before you buy or install it
If you already have tint on your car and are not sure whether it is legal, you can have it measured by a tint shop or by some police departments. Many shops have a light transmission meter and can tell you the exact percentage. Some police departments also offer this service, though availability varies by jurisdiction.
If you are planning to have new tint installed, ask the shop what VLT percentage they will use for your front side windows. Reputable shops in California will automatically use 70 percent or higher for the front. If a shop offers to install darker tint on your front windows without asking about a medical exemption, that is a sign they may not be following California law. You are responsible for the legality of your vehicle, so it is worth asking questions before you pay.
You can also contact your local police department's non-emergency line and ask whether they can measure your current tint or recommend a shop that does. Some departments have this capability and are willing to help.
Reflective tint and other restrictions
California also bans reflective or mirrored tint on any window. This means your tint cannot have a shiny, mirror-like finish that reflects light outward. The tint must be a solid color that absorbs light rather than bouncing it back. This rule applies to all windows, including the rear, even though the rear can be as dark as you want.
Additionally, your side windows cannot have any aftermarket reflective material or coating that makes them look like a mirror. If your tint has a reflective quality, you can receive a ticket for that alone, separate from any darkness violation. When you buy tint, check the product description to confirm it is non-reflective.
Frequently Asked Questions
Can I tint my rear windshield as dark as I want in California?
Yes. California law does not set a minimum light transmission for rear side windows or the rear windshield, so you can use any darkness you want on those windows. The restrictions only explore to your front windshield and front side windows.
Do I need to remove tint if I move to California from another state?
If your tint was legal in your previous state but is darker than California allows on your front windows, you will need to lighten or remove it once you register your vehicle in California. California law applies to all registered vehicles, regardless of where they were tinted. You have time to fix it before you receive a ticket, but it is best to do it soon after registration.
What if I buy a used car that already has illegal tint?
You become responsible for the tint once you own the car. If you are stopped and the tint is illegal, you will receive a ticket in your name. It is a good idea to have the tint checked or removed before you drive the car regularly, especially if you are unsure about its darkness.
Can a tint shop be held responsible if they install illegal tint?
You are the vehicle owner and are responsible for what is on your car, so you will receive the ticket. However, you can report a shop to the California Department of Consumer Affairs if they knowingly installed illegal tint or misled you about what is legal. Many shops carry liability insurance and may cover the cost of fixing illegal tint they installed.
How do I know if my tint is reflective?
Reflective tint looks shiny or mirror-like when you look at it from outside the car. If your windows look like they have a metallic or chrome finish, the tint is likely reflective and illegal. Non-reflective tint looks matte or solid-colored. If you are unsure, a tint shop can tell you whether your current tint is reflective.