Missouri window tint law, in plain English.

The short version

Missouri regulates one thing tightly: the two windows next to the driver. Everything behind you is largely your business.

• Front side windows: must let through 35% or more of visible light, with a plus-or-minus 3% tolerance.
• Reflectivity: no more than 35% luminous reflectance, same 3% tolerance — so no mirror finish.
• Windshield: tint is prohibited, except the shaded band across the top that the manufacturer already tints.
• Back side windows and rear glass: not restricted by the tint statute.
• Factory tinted glass: exempt — the privacy glass your vehicle came with is fine.
• Penalty: a violation is a class C misdemeanor.

The law is RSMo 307.173, and it's short enough to read in two minutes.

What "35% VLT" actually means

VLT is Visible Light Transmission — the percentage of visible light that makes it through the window. Lower number, darker window. 35% VLT lets 35% of the light through; 5% ("limo tint") lets almost none.

The number that matters is the combined figure: your film plus the glass it's on. Automotive glass isn't perfectly clear to begin with, so a 35% film on a window that already blocks some light can land you under the limit. A shop that tints to the law measures the finished window with a meter rather than trusting the number on the box.

The parts people get wrong

"The back can be as dark as I want" — basically true

The tint statute doesn't set a limit for back side windows or the rear windshield, which is why you see genuinely dark rear glass on legal vehicles all over Missouri. Two practical notes: you're giving up rearward visibility, so make sure both side mirrors are present and usable, and other states you drive through are not bound by Missouri's rules.

"There's a tolerance, so I can go a bit darker" — careful

The 3% tolerance exists to absorb measurement and manufacturing variance, not to give you a darker legal limit. Treat 35% as the target, not 32%.

"A visor strip on the windshield is fine" — only up top

Sun-screening on the windshield is prohibited apart from the upper portion the manufacturer normally tints. In practice that means a strip along the top, in line with the factory shade band — not a tinted windshield.

"Out-of-state plates don't have to comply" — no

If you're driving in Missouri, Missouri's rules apply to you.

Medical exemptions

Missouri allows darker front-window tint by permit for a serious medical condition when a physician prescribes it. The permit is issued through the Department of Public Safety, and it extends to the titleholder or a relative within the second degree. Conditions people typically apply with include lupus, photosensitivity disorders, and certain skin cancers. If you think this applies to you, start with your physician, then the permit — not with the film.

What this means when you buy tint

Any shop can put dark film on your front windows. The question is whether they'll tell you it's illegal first. We install to the 35% limit on front side windows by default, and if you want the rear glass darker than that, we'll do it — because that part is legal.

Worth knowing: dark and cool are not the same thing. Modern ceramic film rejects a large share of solar heat at a legal 35%, which is exactly why "I need it dark to keep the heat out" is no longer true. See our window tint service, or ask about the wrap + tint bundle if you're also branding the vehicle.

See the shades against the law

Numbers on a page are hard to picture. Our free tint shade viewer lets you drag from 70% down to 5%, see roughly what each looks like from inside, and get an instant read on whether it's legal on your front windows, your rear glass, or nowhere at all.

This guide summarizes Missouri law as of July 2026 and is general information, not legal advice. Statutes change — check RSMo 307.173 for the current text.