North Carolina window tint law: 35% light transmission and the AS1 windshield line

The rule lives in N.C. Gen. Stat. § 20-127(b), which applies to a vehicle operated on a highway or a public vehicular area, so private parking lots and shopping centers are covered as well as public roads. Three numeric limits control every window other than the windshield. Total light transmission must be at least thirty-five percent (35%). Light reflectance must be twenty percent (20%) or less, which rules out mirrored and metallic films. The film must be nonreflective and must not be red, yellow, or amber, so the color restriction is separate from the reflectance figure and applies even to a light film that passes both percentage tests.

The 35% figure carries a tolerance that most states do not write into the statute. G.S. 20-127(b)(1) says a window that measures more than thirty-two percent (32%) on a light meter approved by the Commissioner of Motor Vehicles is conclusively presumed to meet the restriction. That is a three point cushion for meter error and for the light lost through the factory glass itself, and the word conclusively means the presumption cannot be argued around once the meter reading is taken.

The windshield is treated differently and no exemption reaches it. G.S. 20-127(c) opens by saying the restrictions apply without exception to the windshield. Tint on the windshield is confined to a strip along the top, and it may not extend more than five inches below the top of the windshield or below the AS1 line, whichever measurement is longer. The AS1 line is the mark the glass manufacturer etches into the windshield, and on many vehicles it sits lower than five inches, which is why the statute takes whichever of the two is longer. Separately, the subsection expressly permits an untinted clear film that does not obstruct vision but reduces or eliminates ultraviolet radiation to be applied to the windshield, so a clear UV or ceramic film with no shading is lawful across the whole glass.

North Carolina's exemption list is written by vehicle type, not by occupation, and it has shrunk rather than grown. The nine live exemptions in G.S. 20-127(c) release only the transmission and reflectance limits, never the color rule and never the windshield. They cover an excursion passenger vehicle, a motor home, an ambulance, the rear window of a property hauling vehicle, a limousine, a law enforcement vehicle, any window behind the driver of a multipurpose vehicle, a window on a vehicle registered in another state that meets that state's requirements, and a window on a vehicle holding a DMV medical exception permit. The multipurpose vehicle definition does most of the work for ordinary drivers: it is a passenger vehicle designed to carry ten or fewer passengers that is either built on a truck chassis or has special features for occasional off road operation, and the statute names minivans and pickup trucks as examples. Subdivisions (c)(2) and (c)(3), which had exempted for hire passenger vehicles and common carriers of passengers, were struck by S.L. 2012-78, s. 8 effective December 1, 2012, so North Carolina taxis and buses now sit under the same 35% rule as a sedan.

Commercial trucks answer to a different standard. G.S. 20-127(b1) says that notwithstanding subsection (b), a window on a vehicle subject to Part 393 of Title 49 of the Code of Federal Regulations must comply with that Part, which imposes its own 70% transmission floor on the windshield and front side windows of a commercial motor vehicle.

The medical route is administered by the Drivers Medical Evaluation Program rather than by a court. A person whose medical condition makes them photosensitive to visible light applies in writing and has a doctor complete the Division's medical evaluation form. A permit lasts five years unless the Program directs a shorter term, renewal requires medical recertification that the condition continues, and S.L. 2025-47, s. 21 raised the number of permits one person may hold at any one time from two to four, which matters for a household running more than one vehicle. The permit names the vehicle it applies to, the windows that may be tinted and the permitted levels of tinting, and it must be carried in that vehicle when it is driven on a highway. The Division also supplies a sticker for the lower left hand corner of the rear window, placed between the glass and the film, so a future buyer is on notice that the vehicle does not meet G.S. 20-127(b).

The biggest recent change is procedural. S.L. 2025-47, s. 22, effective December 1, 2025, rewrote the safety inspection scope at G.S. 20-183.3(a)(5) so that it now reads simply "Windshield wipers, as required by G.S. 20-127(a)." The light meter procedure and the automotive film check card step were deleted, the ten dollar after factory tint inspection fee came out of G.S. 20-183.7(a), and two inspection station sanctions tied to tint at G.S. 20-183.7B were repealed. Tint in North Carolina is now a roadside matter only. The same act added G.S. 20-127(g), which requires the driver of a vehicle with tinted windows to roll down the driver side window when a law enforcement officer approaches, or the passenger window if the officer comes up that side.

S. 20-127(d) makes two things a Class 3 misdemeanor: applying tint to a window of a vehicle subject to a North Carolina safety inspection so that the resulting window fails the restrictions, and driving on a highway or public vehicular area with a window that fails them. A Class 3 misdemeanor is the lowest grade of crime in North Carolina and a first offender is punished by a fine rather than active time, but the offense reaches the installer as well as the driver. S.

20-127(e) supplies a cure defense that is worth knowing before court: if the tinting was removed within 15 days after the charge and the window now complies, that is a defense, but only if the person charged produces in court, or submits to the prosecuting attorney before trial, a certificate from the Division of Motor Vehicles or the Highway Patrol showing that the window complies. A receipt from the shop that stripped the film is not the certificate the statute names. 00) fine. S. 3(a)(5) now reaches only windshield wipers, so registration renewal is not the pressure point it was for the previous decade. S. 20-127(g) obliges the driver to lower the window as the officer walks up.