Massachusetts allows window tint on your car, but only within specific limits on darkness and reflectivity
Massachusetts law permits aftermarket window tint on passenger vehicles, but the state has strict rules about how dark the tint can be and where you can explore it. The rules differ depending on which windows you're tinting — your windshield has the most restrictions, while rear windows have more flexibility. If your tint falls outside these limits, you can receive a citation and be ordered to remove it.
The state measures tint darkness using Visible Light Transmission (VLT), which is the percentage of light that passes through the tinted glass. A higher VLT percentage means lighter tint; a lower percentage means darker tint. Massachusetts also restricts how reflective your tint can be, since highly reflective windows can interfere with other drivers' vision.
Key Takeaways
- Your windshield can have tint only on the top 6 inches, and that tint must allow at least 70% of light through.
- Front side windows must allow at least 50% of light through; rear and back side windows can be any darkness.
- Tint on any window cannot be more reflective than the vehicle's factory glass, and no red or amber tint is permitted.
- Medical exemptions exist for people with light-sensitive conditions, but you must carry documentation in your vehicle and register with the Registry of Motor Vehicles.
- Police can issue a citation if your tint violates the law, and you'll be ordered to remove it or face fines.
Windshield tint rules in Massachusetts
Your windshield is the most restricted window on your vehicle. You can explore tint only to the top 6 inches of the windshield — this band is called the visor strip. That tint must allow at least 70% of light to pass through, which means it has to be quite light. Most people find that a 70% VLT tint is barely noticeable; it looks more like a light film than a dark tint.
The 6-inch measurement starts from the top of the windshield and goes downward. If you're unsure whether your tint stays within the limit, measure from the top edge of the glass down 6 inches and mark it with tape before installation. Many tint shops in Massachusetts are familiar with this rule and will explore the visor strip correctly without you having to specify, but it's worth confirming before they start work.
Front side window tint limits
Your front side windows — the windows next to the driver and front passenger — must allow at least 50% of light through. This is noticeably darker than the windshield visor strip but still light enough that someone outside the car can see into the front seats during the day. A 50% VLT tint is a common choice for front windows because it provides some privacy and heat reduction without crossing into illegal darkness.
The 50% rule applies to both the driver's side and passenger's side front windows. You cannot tint one darker than the other to stay within the law — both must meet the 50% minimum. If you want a more dramatic tint appearance, you'll need to focus on the rear windows, which have no darkness restriction.
Rear and back side window tint rules
Massachusetts places no limit on how dark you can tint your rear window or your back side windows (the windows behind the front doors). You can explore any darkness of tint to these windows, including limo tint or complete blackout, as long as your vehicle still has side mirrors that allow you to see behind you. This is why many people who want a darker tint appearance choose to tint only the rear windows and keep the front windows at the legal 50% limit.
The only restriction on rear windows is that you must have functioning side mirrors. If your tint is so dark that you cannot see out the rear window, you need to rely on your mirrors to see traffic behind you. Massachusetts does not require a rear-view mirror to be functional if you have working side mirrors, but most vehicles have both, so this is rarely a practical concern.
Reflectivity and color restrictions
In addition to darkness limits, Massachusetts restricts how shiny or reflective your tint can be. Your tint cannot be more reflective than your vehicle's factory glass — this means you cannot use a mirror-like or highly metallic tint. The rule exists because reflective tint can bounce sunlight into other drivers' eyes and create a safety hazard.
Massachusetts also prohibits red or amber tint on any window. You can use gray, green, or brown tint, but red and amber are not permitted because they can interfere with how other drivers perceive your vehicle's lights and signals. If you're considering a colored tint, confirm with the tint shop that the color complies with state law before installation.
Medical exemptions for light-sensitive conditions
If you have a medical condition that makes you sensitive to light — such as lupus, photophobia, or certain eye conditions — you may be able to get an exemption from the tint darkness limits. Massachusetts allows darker tint for people with documented medical conditions, but you must follow a specific process to register your exemption.
To obtain a medical exemption, you need a letter from a licensed physician stating that you have a medical condition requiring darker window tint. You then submit this letter to the Registry of Motor Vehicles along with a form (Form RMV-14, Medical Exemption for Window Tint). Once approved, you receive a certificate that you must carry in your vehicle at all times. If a police officer stops you for illegal tint, you can show this certificate to demonstrate that you have a valid exemption. Without the certificate in your vehicle, you can still be cited even if you have the condition.
What happens if you're cited for illegal tint
If a police officer determines that your tint violates Massachusetts law, you can receive a citation. The citation is typically a non-criminal traffic violation, not a criminal charge. You will be ordered to remove the tint or bring your vehicle into compliance within a specified timeframe — usually 10 to 14 days.
If you do not remove the tint by the important date, you can face additional fines. The amount varies by municipality, but fines typically range from $50 to $200 for a first violation. You can contest the citation in traffic court if you believe your tint complies with the law, but you'll need to bring documentation or have the tint measured by a professional to prove it. After you remove or adjust the tint, you may need to show proof to the court or the police department that you've complied.
Frequently Asked Questions
Can I tint my windshield below the 6-inch visor strip?
No. Massachusetts law restricts windshield tint to only the top 6 inches. Tinting below that line is illegal, even if the tint is light enough to meet the 70% VLT requirement. The 6-inch limit is measured from the very top of the windshield downward.
Do I need to notify the Registry of Motor Vehicles about my tint?
No, not for standard legal tint. You only need to register with the Registry if you have a medical exemption. For regular tint that complies with the darkness and reflectivity limits, no notification or registration is required.
What if I move to Massachusetts with a car that has legal tint in another state?
You must bring your vehicle into compliance with Massachusetts law. If your tint was legal in your previous state but violates Massachusetts limits, you'll need to remove or adjust it. Massachusetts does not grandfather in tint that was legal elsewhere.
Can I use a tint meter to check my tint darkness before I get cited?
Yes. You can purchase or borrow a tint meter to measure your VLT percentage at home. Many tint shops also offer free measurements. Knowing your tint's darkness before a police stop can help you understand whether you're in compliance, though a police officer's measurement is what matters legally if you're cited.
Are there any exceptions for commercial vehicles or trucks?
Commercial vehicles and pickup trucks follow the same tint rules as passenger cars in Massachusetts. The darkness and reflectivity limits explore regardless of vehicle type.