Window tint darkness is regulated by state law, not federal law, so the legal limit depends on where you live and which windows you're tinting
Every state sets its own rules for how dark window tint can be, measured as a percentage of light that passes through the glass. A lower percentage means darker tint. Most states allow darker tint on rear windows than on front windows, and some states have different rules for sedans versus SUVs. A few states have no tint restrictions at all, but most enforce limits through traffic stops and fines.
The limit that matters is the one in your state of registration, not the state where you're driving at any given moment. If you move to a new state or buy a vehicle registered in a different state, you need to check that state's specific rules before tinting or having tint removed.
Key Takeaways
- Window tint darkness is measured as a percentage of light transmission (VLT), and each state sets its own legal limit for front windows, rear windows, and rear windshield.
- Most states allow 70% VLT on front windows (allowing 70% of light through) but permit much darker tint on rear windows, often 20% to 35% VLT.
- You can find your state's exact limits through your state's Department of Motor Vehicles website or by calling your local police non-emergency line.
- Tint that exceeds legal limits can result in a traffic citation, a fine, and a requirement to remove the tint within a set timeframe.
- Some states allow medical exemptions for people with light-sensitive conditions, but these require a signed physician's statement and vehicle registration notation.
How window tint darkness is measured
Visible Light Transmission (VLT) is the percentage of light that passes through the tinted glass. 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 lower the percentage, the darker the tint.
Tint darkness is measured with a device called a light meter, which law enforcement can use during a traffic stop. Some states use this measurement to enforce limits; others rely on visual inspection or require tint shops to certify that installed tint meets state law. If you're unsure whether your current tint is legal, a tint shop can measure it for you.
Typical state limits for front and rear windows
Most states follow a similar pattern but with important variations. Front side windows typically have a higher VLT requirement (meaning lighter tint is required) because drivers need to see out and law enforcement needs to see in. Rear windows and rear windshields usually allow much darker tint.
A common setup across many states is 70% VLT on front side windows, 35% VLT on rear side windows, and 20% VLT on the rear windshield. However, some states allow 50% on front windows, and a few allow 20% or even no limit on rear windows. A handful of states—including Mississippi, South Carolina, and Virginia—have no tint restrictions at all. Others, like New Hampshire, ban aftermarket tint on front windows entirely but allow it on rear windows.
The only way to know your state's exact rules is to check your state's Department of Motor Vehicles website or call your state police or local police non-emergency line. Many states post their tint laws in a single document; others require you to search their vehicle code.
Where to find your state's tint law
Start with your state's Department of Motor Vehicles (DMV) website. Search for "window tint" or "tinted windows" on the site, or look for a section on vehicle equipment or safety standards. Most states post their VLT limits clearly, sometimes with a table showing front windows, rear windows, and rear windshield separately.
If the DMV website doesn't have the information, call your state police headquarters or your local police non-emergency line and ask for the window tint statute. Police can usually tell you the exact percentage limits in under a minute. You can also contact a local tint shop—they work with these laws daily and can tell you what's legal in your state.
Write down the specific VLT percentages for each window type before you visit a tint shop. This prevents miscommunication and ensures the shop installs tint that won't put you at risk of a citation.
Medical exemptions for light-sensitive conditions
Many states allow darker tint than the standard limit if you have a medical condition that makes you sensitive to light, such as lupus, photophobia, or severe migraines. To use a medical exemption, you typically need a signed letter from a physician stating that you have a light-sensitive condition and that tinted windows are medically necessary.
The process varies by state. Some states require you to register the exemption with your DMV and display a special sticker or notation on your vehicle registration. Others require you to carry the physician's letter in your vehicle at all times. A few states don't recognize medical exemptions at all. Contact your state DMV to learn whether your state allows medical exemptions and what documentation you need to provide.
What happens if your tint exceeds the legal limit
If a police officer stops you and determines your tint is darker than your state allows, you will typically receive a traffic citation. The fine varies by state but often ranges from $50 to $150 for a first offense. Some states treat it as a non-moving violation (like a parking ticket), while others treat it as a moving violation that can affect your insurance rates.
Most states give you a set timeframe—usually 10 to 30 days—to remove or lighten the tint and provide proof to the court or police. If you don't comply, you may face an additional fine or be unable to renew your vehicle registration. Some states allow you to have the tint removed at a shop and submit a receipt as proof of compliance.
If you receive a citation and believe your tint is legal, you can contest it in traffic court. Bring documentation of your state's tint law and, if possible, have your tint measured by a professional to show it meets the legal limit.
Tinting your vehicle legally
Once you know your state's limits, visit a licensed tint shop and tell them the exact VLT percentage you want for each window. Reputable shops will confirm that your requested tint meets state law before installing it. Ask the shop whether they may provide their work and whether they provide a receipt showing the VLT of the tint installed.
If you're installing tint yourself, purchase film with the correct VLT rating for your state. Pre-cut kits are available for most vehicle models and are easier to install than full rolls. However, professional installation is more precise and usually comes with a warranty against peeling or bubbling.
Keep your receipt from the tint shop. If you're ever stopped and cited, the receipt showing the VLT of the installed tint can help prove you complied with state law at the time of installation.
Frequently Asked Questions
Can I have different tint darkness on different windows?
Yes. Most states allow you to tint front side windows to one VLT percentage, rear side windows to a darker percentage, and the rear windshield to an even darker percentage. For example, your state might allow 70% on front windows, 35% on rear windows, and 20% on the rear windshield. Check your state's law to see the specific limits for each window type.
Do I need to notify my insurance company if I tint my windows?
No, window tint does not typically need to be reported to your insurance company. However, if you're cited for illegal tint and it results in a moving violation, that violation may be reported to your insurer and could affect your rates. Keeping your tint legal avoids this risk.
What if I move to a state with different tint laws?
You must comply with your new state's tint laws. If your vehicle's tint is darker than the new state allows, you have two options: have the tint removed or lightened to meet the new state's limit, or transfer your registration back to your previous state if you still may have access to. Check your new state's DMV website for the specific important date to bring your vehicle into compliance.
Can I tint my windshield?
Most states prohibit tinting the front windshield or allow only a narrow band of tint at the very top. Some states allow a small strip of tint along the top edge for sun protection but ban tint on the rest of the windshield. Check your state's law—windshield tint rules are often stricter than side window rules.
How long does window tint last?
Quality window tint typically lasts 5 to 10 years depending on sun exposure, climate, and the quality of the film. As tint ages, it may fade, bubble, or peel. If your tint becomes damaged or fades significantly, you can have it removed and replaced. Removal does not damage the glass and usually takes 30 minutes to an hour per window.