Wisconsin window tint laws set front side windows at 50% VLT and back side or rear windows at 35% VLT. Windshield tint may only sit above the AS-1 line marked on the glass. A written physician statement can support a medical exemption for darker film. This guide covers penalties, exemptions, and mirror rules. Wisconsin Administrative Code sets these standards through the Department of Transportation.
What Is VLT and the AS-1 Line
VLT stands for Visible Light Transmission and describes the percentage of visible light that passes through a window. Wisconsin measures VLT through the glass and film combined, not the film rating alone. A lower VLT number means a darker window. The AS-1 line is a factory mark near the windshield top showing where tint may legally sit. Some windshields carry no AS-1 mark, meaning no windshield tint is allowed there.
Front Side Window Tint Limit
Wisconsin requires front side and vent windows to allow at least 50% VLT. This rule comes from Wisconsin Administrative Code Trans 305.32, side and rear window tint standards. The 50% figure applies to windows nearest the driver and front passenger, including any vent window ahead of the front door glass. Measurement covers glass and film together, so factory tint reduces the legal margin left for added film.
Back Side and Rear Window Tint Limit
Back side windows and the rear window must allow at least 35% VLT under the same code section. This limit is darker than the front window standard, a pattern that separates front visibility from rear privacy. The 35% threshold applies whether the vehicle is a sedan, van, or SUV. Trans 305.32 sets this rule alongside the front standard, and both use the same glass and film measurement method.
Windshield Tint Rule
Windshield tint is addressed separately under Wisconsin Administrative Code Trans 305.34, windshield glazing standards. This section permits only non-reflective tint applied above the AS-1 line. No tint below that line is permitted anywhere on the windshield under this code. If a windshield has no AS-1 line marked by the manufacturer, tint placement below an assumed line is not authorized on that glass.
Who These Rules Apply To
These VLT and windshield standards apply to vehicles operated on Wisconsin roads under the Department of Transportation’s administrative code. Wisconsin Statutes section 347.02, vehicle equipment exceptions confirms a separate exception for government vehicles, created through 2023 Wisconsin Act 251. This carve out addresses government vehicle tinting and does not change VLT limits for the public. Personal vehicle owners should rely on the Trans 305.32 and 305.34 figures.
Fine Amounts and Why They Vary
A tint violation in Wisconsin generally results in a citation and a fine, though the exact amount is not fixed statewide in the verified code text. Reported figures differ across sources, ranging from under $100 to near $175. Forfeiture schedules can vary by local court, so the amount owed depends on where the citation is issued. A driver should check the citation for the exact figure owed.
License Points and Repeat Violations
The verified Wisconsin Administrative Code sections covering tint standards do not establish a point schedule tied to a tint citation. Enforcement functions primarily as a forfeiture matter handled through the local court with jurisdiction over the citation. Vehicle owners should not assume a uniform statewide consequence beyond the forfeiture itself. Questions about how a citation was processed can go to the court named on the paperwork.
Medical Exemption
Trans 305.32 allows a medical exemption process for tint darker than the standard VLT limits. The code describes this exemption as supported by a written statement from a treating physician or a Christian Science practitioner. This statement is generally carried in the vehicle rather than submitted through a separate approval process. Some sources describe a formal application and sticker, but the verified code text describes a carried statement instead.
Government Vehicle Exception
Wisconsin Statutes section 347.02 confirms a distinct tint exception applies to government owned vehicles. This exception was created through 2023 Wisconsin Act 251 and is narrow in scope. It does not extend the standard VLT limits available to privately owned vehicles under Trans 305.32 or Trans 305.34. A private vehicle owner cannot rely on this exception to justify darker tint on a personally owned car or truck under any circumstance.
Dual Mirror Requirement
Trans 305.32 also ties a dual side mirror requirement to rear window tint darkness. When rear window VLT falls below 60%, the vehicle generally needs two functioning outside mirrors rather than relying on rear window visibility alone. This threshold sits above the 35% minimum VLT allowed for rear windows under the same code section. A vehicle tinted near the legal 35% minimum falls under this mirror expectation in practice.
Film Percentage vs Measured Glass and Film VLT
A common misconception involves confusing the film manufacturer’s rated percentage with the VLT measured on an installed vehicle. Wisconsin measures VLT through the combined glass and film together, not the film rating printed on a label. Factory glass already blocks some light before film is added, so a film rated near the legal limit can push the reading below the code allowance. Trans 305.32 applies a 3% tolerance during testing.
Whether a Fix It Option Exists
Some drivers assume a tint citation always includes a fix it option similar to certain equipment violations in other states. The verified Wisconsin Administrative Code and statute sections reviewed here do not describe a fix it process tied to tint citations. Handling of a citation, including any correction option, depends on the local court and its own terms. A driver with a pending citation can raise this with that court.
Distinguishing Statutes From Administrative Code
Readers sometimes confuse a Wisconsin Statute with an Administrative Code section, though the two are set by different bodies. The tint rules here come from Trans 305.32 and Trans 305.34, issued through the Department of Transportation. Wisconsin Statutes section 346.88, obstruction of operator’s view governs windshield stickers rather than tint darkness. Confusing these sources causes incorrect citations elsewhere, and readers can review the Disclaimer before relying on legal information online.
Disclaimer
This article is for general informational purposes only. It is not legal advice. Lawwalls publishes informational content only and does not provide legal services or legal advice.
For legal advice about your specific situation contact a licensed attorney in your state. Laws change and vary by jurisdiction. Verify current rules with official government sources or a qualified lawyer.