California Window Tint Law: Limits, Exemptions, and Penalties

Under California window tint law, the windshield and front side windows are heavily restricted while the rear side windows and back window can be tinted as dark as you want. Vehicle Code Section 26708 sets the rules: no darkening film on the front side windows (only clear, colorless film that passes at least 88 percent of visible light), only a narrow tint strip along the top of the windshield, and no color or mirror-finish material where the driver’s view matters. Violations usually start as a fix-it ticket with a $25 dismissal fee, but an ignored citation can run about $197 and repeat every time you drive.

Windshield Rules

California does not use the “AS-1 line” or a fixed four-inch measurement that other states rely on. Section 26708(c) instead measures from the driver’s seated position: the bottom edge of any windshield tint strip must sit at least 29 inches above the undepressed driver’s seat, measured from a point five inches in front of the bottom of the backrest with the seat in its rearmost and lowest position on a level surface.¹ On most vehicles that leaves a narrow band across the top of the glass.

The strip itself has limits. It cannot be red or amber, cannot carry opaque lettering, and cannot reflect sunlight or headlight glare into other drivers’ eyes any more than bare glass would.² Mirror-finish and heavily metallic strips fail that reflectivity test.

Front Side Windows

This is where drivers get caught. Standard dark tint film is not legal on the windows next to the driver and front passenger. Section 26708(d) only permits material that is clear, colorless, and transparent. The film must pass at least 88 percent of visible light on its own, and once applied to the factory glass the combined assembly must still meet the federal minimum of 70 percent visible light transmittance under Federal Motor Vehicle Safety Standard No. 205.¹

The film also has to be designed to block ultraviolet A rays, and it must not tear, bubble, or wear down to the point of reducing clear vision.² Any noticeable darkening of the front side windows is illegal without a medical exemption. Legal UV-blocking films are nearly invisible to the naked eye.

Rear Side Windows and Back Window

Behind the front seats, the rules loosen sharply. Side windows to the rear of the front seat are exempt from Section 26708’s general prohibition on window coverings, so there is no minimum VLT for them.¹ Limo-dark film is fine on those windows.

The back window is the same, with one condition: the vehicle must have outside mirrors on both the left and right sides that give the driver a view of the highway for at least 200 feet behind the vehicle.² Most modern cars already have dual side mirrors. If yours doesn’t, tinting the back window creates a separate violation.

Color and Reflectivity

Red and amber tint are banned on the windshield outright. The front side window provision goes further and requires any film to be colorless. Section 26708.5 broadly prohibits material that “alters the color” of any window unless another provision specifically allows it.³ Rear windows have more flexibility, but colors that could be mistaken for emergency vehicle lighting are a poor choice.

Reflectivity is judged against bare glass rather than a fixed percentage: if the film throws more glare than an untinted window would, it fails.

Medical Exemptions

California has two separate medical pathways, and they do different things.

Sun Screening Devices on Front Side Windows

Section 26708(b)(10) lets a driver or front-seat passenger with a medical or visual condition requiring sun protection install a sun screening device on the front side windows. You need a signed letter from a licensed physician and surgeon certifying medical need, or from a licensed optometrist certifying visual need, and you must keep it in the vehicle.¹ Section 26708.2 limits these devices to green, gray, or neutral smoke colors with a minimum of 35 percent light transmittance. They cannot be used during darkness.

Clear UV-Blocking Film Under a Dermatologist’s Certificate

Section 26708(e) covers people who should not be exposed to ultraviolet rays. It permits clear, colorless, transparent UV-blocking film on the windshield, side windows, or rear windows, but the film must still pass at least 88 percent visible light and meet the 70 percent combined federal standard. You need a certificate signed by a licensed dermatologist stating the medical necessity.² Because the film has to be clear and colorless, this exemption does not let you install dark tint on the windshield or front side windows. It only expands where clear UV film can go.

For either pathway, keep the paperwork in the vehicle. An officer who sees unusual window treatment will ask, and a missing letter turns a valid exemption into a citation.

Certificate You Must Keep in the Vehicle

Any clear UV-blocking film installed under Section 26708(d) or (e) requires an in-vehicle certificate. Professionally installed film needs a certificate signed by the installing company that identifies both the installer and the film manufacturer by full name and street address. For self-installed film, the manufacturer’s own certificate does the same job.¹ Without it, the officer has no way to confirm the film meets the standard, and you have no quick defense at the roadside.

Penalties for Illegal Tint

Illegal window tint is treated as a mechanical defect under Vehicle Code Section 40610, so the officer usually writes a fix-it ticket rather than a straight fine. The notice gives you a reasonable time (generally up to 30 days) to remove or replace the film.⁴

Once the tint is off, take the vehicle to a local law enforcement officer and have them sign the Certificate of Correction on the back of the ticket. Then send the signed ticket to the court with a $25 dismissal fee per fix-it ticket.⁵ That is the cheapest outcome.

Ignore the ticket and the numbers change. An uncorrected tint citation can run around $197, and you can be cited again every time you drive the vehicle with the illegal film still on it. An unresolved ticket can also trigger a failure-to-appear charge with its own penalties and effects on your driving record. Section 40610 also lets an officer skip the correction notice entirely and issue a standard citation from the start if there is evidence of fraud, persistent neglect, or an immediate safety hazard.⁴

Choosing a Legal Film

For the rear windows, where darkness isn’t capped, the choice is about comfort and durability rather than legality. Dyed films are the cheapest and fade over time. Carbon films don’t fade and contain no metal, so they won’t interfere with phone signals or GPS. Ceramic films resist fading, block up to 99 percent of UV rays, and are non-metallic. Professional installation for a standard sedan ranges from around $100 for basic dyed film to $1,500 or more for premium ceramic.

For the front side windows, your only legal option without a medical exemption is a clear, colorless UV-blocking film that meets the 88 percent VLT threshold. If you already have illegal tint and need it stripped to correct a fix-it ticket, professional removal generally runs $25 to $140.

1
California Legislative Information. California Code VEH – Section 26708
2
California Legislative Information. California Vehicle Code 26708 – Windshields and Mirrors
3
California Legislative Information. California Code VEH – Section 26708.5
4
California Legislative Information. California Code, Vehicle Code VEH 40610 – Notice to Correct Violation
5
California Courts | Self Help Guide. What to do if you got a fix-it ticket