Wisconsin requires nonreflective added film with at least 50% transmission beside the driver and 35% on rear glass. The rules distinguish added film from original factory tint.
Read the official sources ↓Rules by window
| Window | Requirement |
|---|---|
| Windshield | Added film only outside the critical viewing area and above the horizontal boundary marked by the manufacturer’s A marking. Without that mark, no added windshield film. Trans 305.34(6)(c). |
| Front side | At least 50% combined glass-and-film transmission; nonreflective film. Trans 305.32(4). |
| Rear side | At least 35% combined transmission for added film; nonreflective. Original manufacturer tint is addressed separately. Trans 305.32(6). |
| Rear window | At least 35% combined transmission for added film; nonreflective. Both outside mirrors are required if transmission is below 60%. Trans 305.32(5). |
Factory tint and testing
Trans 305.32 distinguishes factory-installed tint from applied film and specifies a 3% testing tolerance. Do not subtract that tolerance when choosing film or assume a vehicle’s SUV label exempts added rear film.
Medical documentation
Trans 305.32(4)(b)3 permits nonreflective front-side film down to 35% with a recommendation from a physician or Christian Science practitioner treating the owner or an immediate family member. Carry a statement identifying the patient, condition, temporary/permanent status and vehicle make, model, year and VIN. Remove the film if the vehicle is sold, the patient leaves the owner’s household or the temporary condition expires.
Before you rely on this guide
This is general information, not legal advice, a vehicle inspection, or permission to install a particular film. Exceptions and enforcement procedures can depend on your circumstances.
- No separate prohibited-color list or ordinary film-certification-label requirement was established in the tint rules reviewed. Safety-glass identification is a separate equipment requirement.
- Trans 305.32 and 305.34 also apply to heavy trucks through Trans 305.485. Historical, homemade, reconstructed, replica and street-modified vehicles need a separate applicability check under Trans 305.02; an all-years assumption is unsafe.
The research date shows when the sources were checked. It is not the date the law took effect, and it does not mean this page is monitored continuously. This research preview still awaits human editorial review; we do not claim attorney review.
Official sources
- Wisconsin administrative rule Trans 305.32 ↗
Current legislative text retrieved directly: combined transmission, nonreflectivity, medical conditions, factory tint, mirrors and 3% tolerance.
- Wisconsin administrative rule Trans 305.34 ↗
Current legislative text retrieved directly: windshield critical area and manufacturer-mark boundary.
- Wisconsin DOT enforcement FAQ ↗
Current agency summary corroborates front-side 50% and rear 35% light transmission.
- Wisconsin Trans 305: vehicle applicability ↗
Trans 305.02, 305.07 and 305.485: historical categories and heavy-truck cross-reference.