Tint Laws & UV Protection

Arizona

Arizona rules & medical exemptions

MVD issues the exemption. A physician’s certification supports the application. Purchasing a medical evaluation or obtaining a physician letter is not MVD approval. The medical exemption covers qualifying side and rear windows, not full-windshield tint.

Windshield strips

The ordinary transparent strip belongs at the topmost windshield portion. Its lower edge must be at least 29 inches above the undepressed driver’s seat, measured from a point five inches ahead of the bottom of the backrest, with the seat fully rearward and lowered and the vehicle level. The strip cannot be red or amber.

ADOT’s medical application says the exemption does not apply below the AS-1 line; the statute uses the seat-based measurement above. Have the installer verify the permitted boundary. Do not assume a universal four-inch or five-inch rule. Nearly clear UV film is not automatically lawful across the full windshield.

From medical evaluation to installation

1. Medical evaluation
2. Required documentation
3. Submit to MVD
4. Receive approval
5. Install within the approval’s scope

Use current ADOT Form 40-1511 and its certification requirements. The form calls for a personal examination and inadequate protection from eye-protective devices alone. ADOT’s FAQ also requests a physician letter and vehicle registration copy. Follow the current agency instructions.

Approval is not guaranteed. The exemption may cover a vehicle you own or one in which you are a habitual passenger. Keep the certificate in the vehicle and follow its actual window, VLT, expiration, and other conditions; the statute does not set a universal exempt VLT or three-year term.

Arizona statutes, application & instructions

California

Three distinct California provisions

California medical documentation does not authorize arbitrary dark permanent tint on the windshield or front side windows.

These provisions rely on carried documentation rather than an Arizona-style DMV-issued tint permit. The document must match the applicable route.

Rear windows & windshield strips

Rear side windows have no minimum VLT under §26708(b)(4). The rear window has no minimum VLT when both outside mirrors provide at least a 200-foot rear view.

The ordinary topmost windshield strip uses the 29-inch seat-based measurement: measure from a point five inches ahead of the bottom of the backrest, with the seat fully rearward and lowered, the vehicle level, and the seat undepressed. It cannot be red or amber, contain opaque lettering, distort vision or primary colors, or create more reflected glare than untreated glass. This is not a universal four-inch or five-inch strip rule.

California statutory sources

Medical Documentation for Qualifying Sun Protection

Medical necessity & HSA funds

Can I use HSA funds for medically necessary window film?

Medically necessary window film may qualify for payment or reimbursement using HSA funds, depending on the individual circumstances and applicable IRS requirements. Published benefits guidance includes medically recommended automotive window tint as a potentially qualifying expense. However, IRS Publication 502 does not specifically list window tint as an approved expense.

A Letter of Medical Necessity can document the condition being addressed and explain why UV filtration, visible-light reduction, or both are medically recommended. General comfort, appearance, privacy, or cosmetic preferences alone do not establish medical necessity.

Before claiming the expense, consult your tax adviser. Retain your medical documentation, the film specifications, and an itemized installation receipt. A physician’s recommendation or state medical tint exemption does not guarantee eligibility.

Sources: IRS Publication 502 · IRS Publication 969 · Kushner & Company HSA/FSA expense guide (PDF). The Kushner guide is an example of published benefits guidance, not IRS authority or a guarantee of current eligibility.

HSA documentation questions