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State tint law · · 2-minute read

Window Tint Laws in Iowa (2026): Legal VLT Limits and Exemptions

What Iowa allows on each window, the windshield rule, medical exemptions and how roadside checks work, with the statute cited.

By Armor Atlas · Summarized from the statute, linked on this page

Iowa tint rules at a glance

Front side windows
50%
Minimum VLT, film and glass together
Back side windows
Any
Any darkness allowed
Rear window
Any
Any darkness allowed
Windshield
The whole windshield must keep at least 70% light transmittance; the statute grants no separate top-strip allowance.
Medical exemption
No
Sticker or certificate
Not required
Two outside mirrors
Not required
Penalty
$70 scheduled fine plus court costs and surcharge (Iowa Code 805.8A(3)(ai)).

VLT is the share of light the glass lets through, film and glass together. Source: Iowa Code § 321.438(2), as amended by 2026 Iowa Acts ch. 1100 (HF 766), checked Nov 5, 2026. Laws change; confirm with the statute before tinting.

Iowa regulates window tint through Iowa Code § 321.438(2), as amended by 2026 Iowa Acts ch. 1100 (HF 766). Below: the minimum visible light transmission (VLT) for each window, the windshield rule, what counts as too reflective, who can get a medical exemption, and how an officer checks a car at the roadside.

  • Front side windows: at least 50% VLT.
  • Back side windows: any darkness.
  • Rear window: any darkness.

VLT is measured through film and glass together. Factory glass already blocks some light, usually landing between 70% and 80% VLT before any film, so a roll sold as "35%" on a window that started at 75% ends up darker than 35% once installed. Officers meter the finished window, not the box the film came in.

Windshield

The whole windshield must keep at least 70% light transmittance; the statute grants no separate top-strip allowance.

Federal standard FMVSS 205 sets the baseline for the glass itself: the windshield and front side windows of a new car must transmit at least 70% of visible light. State law decides what film may be added afterwards, which is why the windshield rule is usually a strip above the AS-1 line rather than a percentage.

Reflective and colored film

Iowa's statute sets no separate reflectivity limit; the VLT limits above still apply to metallic and mirrored films. No film colors are singled out.

Medical exemptions

Iowa does not provide a medical exemption from its tint limits.

Stickers, mirrors and enforcement

No sticker or certificate is required for legal tint. Tinting the rear window does not trigger a second-mirror requirement. $70 scheduled fine plus court costs and surcharge (Iowa Code 805.8A(3)(ai)).

In practice

House File 766, signed May 15, 2026 and effective July 1, 2026, replaced the DOT's 70% rule for front glass with statutory numbers: front side windows and sidewings at 50% and the windshield at 70%. Windows behind the driver are not regulated beyond the general clear-vision requirement. DOT rule 761 IAC 450.7 still reads 70% for front side windows until it is rewritten, so expect stale figures in older guides and meters set to the old standard. Since November 2023 the DOT no longer suspends registration on a tint report unless the owner has already been cited twice.

Sources

Checked Nov 5, 2026. Laws change; confirm with the statute before tinting.

Common questions about tint in Iowa

Is 50% tint legal on front windows in Iowa?

Yes. 50% is the darkest Iowa allows on front side windows: the glass and film together must let at least 50% of visible light through. Anything darker fails a meter check.

Can I tint my windshield in Iowa?

The whole windshield must keep at least 70% light transmittance; the statute grants no separate top-strip allowance. Film below that line is not permitted for ordinary drivers.

Does Iowa allow darker tint for medical reasons?

No. Iowa's statute does not provide a medical exemption from its tint limits.

What happens if my tint is too dark in Iowa?

$70 scheduled fine plus court costs and surcharge (Iowa Code 805.8A(3)(ai)).

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