If you’ve ever wondered whether your favorite dark‑sized windows will survive a police stop, the answer is clear: Wisconsin law permits a maximum of 35 percent visible light transmission (VLT) on the front side windows and 70 percent on the rear side and back windows for 2026. Anything darker than those thresholds is illegal and can result in fines, mandatory tint removal, and points on your driver’s record.
Legal Limits for 2026
Wisconsin statutes (Wis. Stat. § 346.31) set the VLT standards that manufacturers and drivers must follow. For passenger vehicles, the front driver’s and passenger’s windows cannot block more than 35 percent of visible light. The rear side windows and the rear windshield may be tinted up to 70 percent VLT, provided the vehicle has side mirrors that give a clear view of the rear. These limits have remained unchanged since the 2010 amendment, and no new legislation is slated for 2026.
How Tint Is Measured
Law enforcement uses a handheld photometer to gauge VLT. The device shines a calibrated light through the glass and records the percentage that passes through. The reading must be taken at normal driving temperature, because heat can affect tint performance. Certified tint installers are required to provide a compliance certificate showing the exact VLT measured at the time of installation.
Exceptions and Penalties
Medical exemptions (Wis. Stat. § 340.05) allow darker tint for drivers with certain conditions, such as photosensitivity, provided a physician’s statement and an exemption plate are displayed. Failure to meet legal VLT results in a moving violation—typically a $150 fine and a mandatory court appearance. Repeated offenses can add six points to the driver’s license and may lead to vehicle registration suspension.
Anticipated Changes After 2026
Although no bills are pending, national trends show a push toward stricter enforcement and potential reductions in allowable VLT for front windows to improve road safety. Automakers are already offering factory‑installed tints that comply with the current 35 percent limit, signaling that future adjustments, if any, will likely be incremental rather than sweeping.
What happens if I’m stopped with illegal tint?
The officer will issue a citation and may order the tint be removed or replaced within a stipulated period. You can contest the ticket in court, but you must provide proof of compliance or a valid medical exemption.
Can I install a darker tint on the rear windshield?
Yes, up to 70 percent VLT is permissible on the rear windshield, but you must have working side mirrors that give an unobstructed view of the rear.
Do temporary films count toward the VLT limits?
Yes. Any film applied to the glass—temporary or permanent—must meet the legal VLT standards at the time of inspection.
How do I verify my tint’s VLT before installation?
Ask the installer for a compliance certificate measured with a calibrated photometer. Reputable shops will provide this documentation free of charge.
Are there any differences for commercial vehicles?
Commercial trucks and buses follow the same front‑window VLT limits but may have different rear‑window allowances, often more lenient, depending on the vehicle’s design and use. Check the specific provisions in Wis. Stat. § 346.31 for details.