California Vehicle Code § 26708 governs window tint on any vehicle driven in California. Material applied to the front side windows must be clear and colorless and must itself transmit at least 88 percent of visible light (§ 26708(d)(1)); the finished window must still transmit at least 70 percent as a combined glass-plus-film system (Federal Motor Vehicle Safety Standard No. 205, incorporated by § 26708(d)(2)); and the driver must carry a certificate from the installing company naming the installer and the film manufacturer (§ 26708(d)(4)). The windshield may carry non-reflective material only above a line measured 29 inches above the undepressed driver's seat (§ 26708(c)(1)). Rear side windows are exempt (§ 26708(b)(4)), and so is the back window when the car has outside mirrors on both sides (§ 26708(b)(8)). Installing non-compliant film is itself prohibited (§ 26708.5(a)).
Below: each window position with the subdivision that controls it, the two medical-exemption provisions and what each actually permits, the current fix-it-ticket schedule, and the specific errors most commonly repeated about this statute. Statute and interpretation are kept visibly separate — the Sources section at the end lists the exact subdivisions used.
Understanding VLT (Visible Light Transmission)
Window tint darkness is measured by Visible Light Transmission (VLT)—the percentage of visible light that passes through the window. A higher VLT percentage means more light passes through (lighter tint), while a lower percentage means less light passes through (darker tint).
Importantly, California's VLT requirements apply to the combined effect of the tint film and the factory glass. Since factory glass typically blocks 15-25% of light already, this affects what film you can legally apply. This is why professional installation matters—shops like ours measure and verify VLT to ensure compliance.
California Window Tint Laws by Window Position
| Window | Legal Requirement | Notes |
|---|---|---|
| Front Windshield | Top strip only: bottom edge ≥29" above the undepressed driver's seat; not red/amber, no opaque lettering, no more reflective than bare glass | CVC 26708(c). Clear ≥88% film below the line only with a dermatologist certificate (26708(e)) |
| Front Side Windows | Clear film ≥88% VLT only; finished window ≥70% VLT; installer certificate in the car | CVC 26708(d) + FMVSS 205 |
| Rear Side Windows | No darkness limit | Exempt under CVC 26708(b)(4) |
| Rear Window | No darkness limit | Exempt if outside mirrors on both sides give a 200-ft rear view (CVC 26708(b)(8)) |
Front Windshield
California permits non-reflective tint on the topmost portion of the windshield. Almost every guide describes that limit as “the AS-1 line” — but that is the industry convention, not the statute. Vehicle Code section 26708(c)(1) sets a measurement instead: the bottom edge of the material must be 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 lowermost position and the vehicle on a level surface.
The AS-1 line is a marking the glass manufacturer etches into the windshield, and on most vehicles it falls close to where the 29-inch rule lands — which is why the shorthand survives. It is not the legal test, and neither is a fixed number of inches from the top. On a vehicle with an unusually high or low seating position the two can diverge, and it is the 29 inches that an officer and a court are measuring against.
The strip must also not be red or amber, carry no opaque lettering, and reflect no more glare than the bare windshield (§ 26708(c)(2)–(4)). Below the 29-inch line the windshield must stay clear: the only exception is clear material of at least 88% VLT with a certificate signed by a licensed dermatologist (§ 26708(e)). Without that certificate, film below the line is not permitted, however clear it is. See California windshield tint law.
Front Side Windows (Driver & Passenger)
California's law is strictest on the front side windows. Only clear, colorless film of at least 88% VLT is allowed, and the finished window must still transmit at least 70 percent of visible light — so no visibly tinted film is permitted.
Two numbers govern the front side windows, and conflating them is the most common error in guides on this subject. The 70 percent figure is the combined transmittance of glass plus film and comes from Federal Motor Vehicle Safety Standard No. 205, which California incorporates through § 26708(d)(2). Section 26708(d)(1) separately governs the film itself: material applied to a front side window must have a minimum visible light transmittance of 88 percent. Both are correct; they measure different things. Section 26708(d)(4) adds a paperwork rule most guides skip: the driver must carry a certificate signed by the installing company, identifying the installer and the film manufacturer by full name and street address. For a complete breakdown of how dark tint can be in California by window position, see our dedicated guide.
Factory glass on a modern vehicle typically transmits around 80 percent of visible light before any film is applied, so a “70 percent film” stacked on top of it lands well below the combined 70 percent floor. The film has to be nearly clear — 88 percent or better — for the finished window to stay compliant. Any shop offering a visibly darker front-window film is offering a fix-it ticket.
None of the tinted films we stock (our Avery Dennison Encore range tops out at 55% VLT) is legal on the front side windows. Where the heat and UV work happens in a California-legal install is behind the front seats, where any shade is allowed.
Rear Side Windows
California places no restrictions on rear side window tint. You can legally apply any darkness level, from 50% (light) to 5% (limo tint). Most customers choose 20-35% for a balanced look that provides privacy and heat rejection without being too dark for nighttime driving. The exemption is CVC 26708(b)(4), which covers side windows to the rear of the driver. Is 20%, 15% or 5% tint legal? Behind the driver, yes.
Rear Window (Back Glass)
Like rear side windows, the rear window can be tinted to any darkness. The exemption in CVC 26708(b)(8) applies when the vehicle has outside mirrors on both the left and right sides that give the driver a view of the road at least 200 feet to the rear (the general mirror rule is § 26709). Most modern vehicles already have dual side mirrors, so this is rarely an issue.
Penalties for Illegal Window Tint in California
Getting caught with illegal window tint in California is cheap in fines and expensive in film. The figures below come from the Vehicle Code and the Judicial Council of California's Uniform Bail and Penalty Schedule (2025 and 2026 editions), which lists tint under CVC 26708 at a $25 base fine with a point count of 0. Most tint citations are correctable fix-it tickets — but you still pay to remove and replace the film:
Violation Penalties
- Fix-it ticket:Correct the window, have it signed off by a law-enforcement agency (police, CHP, sheriff or marshal — VC 40616(c)), and pay the court a $25 transaction fee per violation (VC 40611).
- Not corrected / non-correctable:$25 base fine, about $192 total with assessments and fees. An officer can refuse the fix-it option for fraud or persistent neglect, an immediate safety hazard, or if you cannot promptly correct it (VC 40610(b)).
- Repeat violations:Still infractions, with maximum fines rising to $100, then $200, then $250 (VC 42001). Willfully failing to deliver proof of correction is a misdemeanor (VC 40616). No DMV point is assessed.
Beyond fines, illegal tint can make you a target for traffic stops and may complicate insurance claims if tint is deemed a factor in an accident. The simplest solution is to work with a professional shop that ensures compliance from the start.
Medical Exemptions for Window Tint
California's medical exemption is two separate provisions, and the widely-repeated summary — “a doctor's note gets you darker front tint” — is wrong about what either one actually permits. Neither authorises a specific darker VLT on film.
CVC § 26708(e) — the dermatologist route
Permits clear, colorless, transparent material with a minimum 88 percent visible light transmittance, applied to glass meeting FMVSS No. 205. That is the same 88 percent the general film rule already requires, so this subdivision authorises no additional darkness — what it authorises is UV-blocking material on glass it would otherwise not be permitted on. The certificate must be signed by a licensed dermatologist. Material must be removed or replaced if it tears, bubbles, or wears enough to obstruct clear vision.
CVC § 26708(b)(10) — the sun-screening-device route
Permits sun screening devices meeting § 26708.2 — not window film — on the side windows beside the front seat. A signed letter is required from a licensed physician and surgeon (for a medical condition requiring shade from the sun) or a licensed optometrist (for a visual condition requiring the same). The devices may not be used during darkness.
A note from a general practitioner is not automatically either signatory, and a roll of darker film is not a sun screening device under § 26708.2. Our California tint medical exemption guide keeps the two provisions separate and names what each one actually permits.
Tips for Staying Legal While Maximizing Benefits
Just because front windows are limited doesn't mean you can't enjoy significant benefits from window tinting. Here's how we help Sacramento drivers maximize protection while staying compliant:
- Leave the front side windows to the law: only clear film of at least 88% VLT is allowed there, with the installer certificate in the car.
- Go darker on rear windows: Since there are no restrictions, we recommend 20-35% VLT for rear windows. This creates a gradual transition that looks intentional while providing privacy and heat rejection where it matters most.
- Consider a windshield strip: a non-reflective strip whose bottom edge sits at least 29 inches above the driver's seat is legal and helps with glare at sunrise and sunset.
- Keep the paperwork: if you put clear film on the front side windows, the law requires a certificate from the installing shop, naming the installer and the film manufacturer, in the car (CVC 26708(d)(4)).
Why Choose Quality Window Tinting for Legal Compliance
At Quality Window Tinting, we've been helping Sacramento drivers navigate California's tinting laws for over 20 years. Our experience means you get:
- • Expert knowledge of current California Vehicle Code requirements
- • VLT measurement and verification for every installation
- • Clear answers on what CVC 26708 allows on each window
- • Guidance on medical exemptions if applicable
- • Premium Avery Dennison Encore films (also SunTek certified) available in compliant VLT levels
- • Lifetime warranty on all installations
Don't risk fines and the hassle of removing illegal tint. Contact us for a free consultation and we'll help you maximize the benefits of window tinting while staying 100% legal.
Which applies to you
| If this is you | What we suggest |
|---|---|
| You want a noticeably darker look on the front windows | Not available legally in California. Front side windows can take only clear film of at least 88% VLT (CVC 26708(d)), with the finished window still at 70% or above, and installing darker film is itself prohibited (26708.5(a)). Neither medical provision allows darker film. Any shop that offers to is handing you a fix-it ticket. |
| Your main problem is heat, not appearance | Heat rejection depends on the film’s infrared performance, not its visible darkness, so a ceramic film on the rear side windows and back glass rejects far more heat than a dark dyed film of the same shade. Front side windows can take only clear 88% film. |
| You want privacy for passengers or cargo | Go as dark as you like. California places no limit on rear side windows or the back glass, so the privacy you are after is fully available behind the front seats. |
| You have a diagnosed light-sensitive condition | The medical exemption does not grant darker film. CVC 26708(e) permits clear 88% UV-blocking material (dermatologist signature); 26708(b)(10) covers sun screening devices rather than film (physician or optometrist signature). See the medical exemption guide for which provision applies and what documentation to carry. |
| You bought the car with tint already on it | The citation is usually written to the driver, but installing non-compliant film is itself prohibited (CVC 26708.5). Have the front windows measured before you are pulled over — a meter reading takes a minute and tells you where you stand. |
Common mistakes
Assuming the 70% figure is the film rating
The law sets two tests. The film itself must be clear and at least 88% VLT (CVC 26708(d)(1)), and the finished window, film plus glass, must still measure 70% or more (FMVSS 205). Factory glass already absorbs roughly 15–25% of visible light, so a "70%" film on top of it lands well below 70% at the window and fails both tests. This is the single most common way a well-intentioned installation ends up illegal.
Believing rear windows have a legal limit
They do not. California regulates the windshield and the front side windows and stops there. Drivers routinely pay for lighter rear film than they actually wanted because they assumed a limit existed. The one related requirement is that a vehicle with a dark rear window must have working side mirrors on both sides — which nearly every modern car already does.
Treating a fix-it ticket as a one-time nuisance
A fix-it ticket is correctable, but the correction has to be signed off by law enforcement, which means paying to remove film you already paid to install. The removal is the expensive part, and willfully failing to deliver proof of correction is a misdemeanor (VC 40616). Getting the front windows right the first time costs nothing extra.
Reading another state’s rules and assuming they apply
Tint law varies widely between states and California is among the strictest on front windows. Figures you find for Arizona, Nevada or Washington are not transferable. If you moved here with a legally tinted car, it may not be legal now.
Bottom line
California gives you almost no latitude on the front windows and almost total latitude behind them. That is the whole law in one sentence. The practical consequence is that if you are tinting for heat, glare or UV — which is most people — the clear-film-only front rule costs you less than it appears to, because those benefits come from the film’s infrared and UV performance rather than from how dark it looks. Choose film on its specifications, go dark in the back, and keep the front side windows clear.
Sources
Every legal statement on this page comes from the California Vehicle Code. The sections used, and what each one governs:
- Vehicle Code § 26708 — the operative section. Subdivision (c)(1) sets the 29-inch windshield measurement; (d)(1) sets the 88 percent minimum transmittance for material applied to front side windows and (d)(4) the installer certificate; (b)(4) and (b)(8) exempt the rear side and back windows; (b)(10) and (e)(4) set out the medical-exemption documentation. Text as amended effective January 1, 2026.
- Vehicle Code § 26708.5 — prohibits installing transparent material that alters colour or reduces light transmittance except as section 26708 permits (so the installer, not only the driver, is covered), and covers factory tinted safety glass.
- FMVSS No. 205 — the federal glazing standard California incorporates through § 26708(d)(2), and the origin of the 70 percent combined figure. This is why 70 and 88 are both correct and are not the same measurement.
- Vehicle Code § 26709 — the general side-mirror requirement; the tint-specific rear-window exemption is § 26708(b)(8).
- Vehicle Code §§ 40610, 40611, 40616 and 42001 — the fix-it (notice to correct) procedure, the $25 transaction fee on proof of correction, law-enforcement sign-off and the misdemeanor for willful failure to correct, and the infraction fine maximums.
- Judicial Council of California, Uniform Bail and Penalty Schedule (2025 and 2026 editions) — CVC 26708(a)(1): $25 base, $192 total, point count 0.
Statute versus interpretation. The section numbers, measurements and percentages above are what the code says. The practical guidance around them — which film to choose, what an officer is likely to measure, what a correction costs — is our reading as installers, not law. Enforcement varies, and this page is general information rather than legal advice. For a specific vehicle or a medical exemption, confirm with CHP (which enforces tint; the DMV does not issue tint exemptions) or an attorney.
Reviewed against the statute: . We re-check this page against the Vehicle Code rather than against other tint sites, because the AS-1 shorthand that circulates almost everywhere is not what § 26708(c)(1) actually says, and the “medical exemption for darker tint” summary that circulates almost everywhere is not what § 26708(e) or § 26708(b)(10) actually permits.