Indiana window tint laws require a minimum of 30% VLT on the windshield, side wing, front door side windows, and the rear back window. Reflectivity on these windows cannot exceed 25% as measured from the outside. Windshield tint is only allowed above the manufacturer’s AS-1 line. This guide covers VLT requirements, reflectivity limits, penalties, and the state’s medical exemption process. The controlling law is Indiana Code Section 9-19-19-4, administered under Indiana’s motor vehicle code.
Key Terms Defined
Visible Light Transmission, commonly called VLT, measures the percentage of light that passes through a window and any tint applied to it. A higher VLT number means more light gets through, so the tint looks lighter. A lower VLT number means less light passes through, producing a darker appearance. Indiana’s law uses this percentage to set the minimum darkness allowed on regulated vehicle windows.
Reflectivity refers to how much light a tinted window bounces back toward the outside, measured from the nonfilm side of the glass. Metallic or mirrored tint film increases reflectivity, which can create glare for other drivers and pedestrians. Indiana caps this reflectivity at 25% on the same windows covered by the VLT rule, which keeps tint from becoming a highway safety hazard.
The AS-1 line is a marking placed on a vehicle’s windshield by the manufacturer, typically a few inches down from the top edge. Indiana law allows non-reflective tint only above this line, leaving the main viewing area of the windshield untinted. A Class A infraction is a civil violation category under Indiana law, not a crime, though it can still carry a meaningful financial judgment.
What the Law Says
Indiana Code Section 9-19-19-4 on tinting, glazing, and sunscreening vehicle windows sets the statewide standard for vehicle window tinting. The statute names four specific window positions it regulates: the windshield, the side wing, a side window that is part of a front door, and the rear back window. Each of these must meet a light transmittance of at least 30% and a total solar reflectance of not more than 25% as measured on the nonfilm side of the glass.
The reflectivity limit exists to prevent tint that behaves like a mirror on the road. A window with reflectance above 25% can throw glare back at oncoming drivers or pedestrians, particularly in direct sunlight. Indiana’s 25% cap applies to the same four window positions covered by the VLT rule, so a film that passes the VLT test can still be illegal if it is too reflective.
Windshield tint in Indiana is treated differently from side and rear windows. The statute allows non-reflective treatment only on the uppermost part of the windshield, above the manufacturer’s AS-1 line. This means the main driving field of view through the windshield must remain untinted, while a narrow strip near the top can carry a non-reflective film or factory-applied shading.
Who It Applies To
Indiana Code Section 9-19-19-4 applies to any person who drives a motor vehicle with a windshield, side wing, front door side window, or rear back window that has been covered or treated with sunscreening material or tint in a way that keeps occupants from being easily recognized from outside the vehicle. This is confirmed by the official Indiana state guidance on tinted window law, which names these same four window positions.
A vehicle may be stopped by law enforcement to determine whether its tint complies with this statute. The law is specific that a stop made for this purpose alone does not by itself authorize officers to inspect, search, or detain the vehicle, its contents, the driver, or any passenger beyond confirming tint compliance. This limits how far a routine tint check can extend without independent cause.
Requirements or Elements
Compliance under Indiana law depends on the combined VLT reading, not the VLT rating printed on the tint film alone. Combined VLT is the light transmittance measured after the film has been applied over the factory glass, which is lower than the film’s standalone rating because factory glass itself blocks some light. A film advertised at 40% VLT applied over glass with a lower factory rating can combine to a reading below Indiana’s 30% floor.
Because officers measure the combined reading at the window itself, choosing a film based on its printed percentage without accounting for the factory glass underneath it can result in a vehicle that reads as illegal even though the film alone would have passed. Confirming the expected combined VLT before installation, rather than relying on the film’s label, is the more reliable way to stay within the statutory 30% minimum.
Indiana Code Section 9-19-19-4 does not apply to a manufacturer’s tinting or glazing of vehicle windows or windshields when that factory glazing is otherwise compliant with or permitted by Federal Motor Vehicle Safety Standard 205, codified at 49 CFR 571.205. Proof from the manufacturer, supplier, or installer showing that the tinting or glazing meets this federal standard must be carried in the vehicle to rely on this exception.
This federal standard exception means factory-installed tinted glass is evaluated under a separate federal framework rather than Indiana’s own VLT and reflectivity figures. It applies specifically to manufacturer glazing, and the statute requires documentation proving the federal compliance in order for a driver to invoke it if the tint level would otherwise raise a question under state law.
Penalties or Consequences
Indiana Code Section 9-19-19-8 on the Class A infraction classification classifies a violation of the tinting provisions in Section 4 subsection d of this chapter as a Class A infraction. This is a civil violation category, meaning it does not carry potential jail time the way a criminal offense would, but it can still result in a meaningful financial judgment entered against the driver.
Indiana Code Section 34-28-5-4 on infraction judgment amounts sets the framework for infraction judgment amounts generally, and it allows a judgment of up to $10,000 for a violation constituting a Class A infraction. This figure represents the statutory ceiling under this judgment statute rather than a fixed or typical amount, and actual judgments entered for a tint violation are generally well below this maximum in practice.
Exceptions and Limitations
Indiana Code Section 9-19-19-4 allows an exception to its standard tint rules for a driver whose vehicle is owned by an individual who, for medical reasons, must be shielded from direct sun rays, or for a driver whose vehicle habitually carries such an individual as a passenger. This medical reason must be attested to by a physician or optometrist licensed to practice in Indiana.
The physician’s or optometrist’s certification of the medical condition must be carried in the vehicle at all times to support reliance on this exception. Indiana’s statute further requires that this certificate be renewed annually, meaning a one-time medical letter does not provide an indefinite exemption and must be periodically reconfirmed by the certifying physician or optometrist.
This exception also extends to the person who performs the tint installation. It is not a violation of the tinting chapter for an installer to apply tint that would otherwise exceed the standard limits if the vehicle owner or habitual passenger has submitted the required physician’s or optometrist’s statement to the installer before the work is performed. The documentation requirement therefore applies to both the driver and the installer.
Common Misconceptions
A widely repeated claim online is that Indiana allows unlimited darkness on rear side windows and rear windows for SUVs and vans, similar to rules seen in some other states. The verified text of Indiana Code Section 9-19-19-4 does not draw this vehicle-type distinction. It applies the same 30% VLT and 25% reflectivity standard to the rear back window regardless of vehicle type, based on the four window positions the statute names.
The statute’s list of regulated positions includes the windshield, the side wing, a side window that is part of a front door, and the rear back window. Rear side windows located behind the front doors are not separately named among these four positions in the operative text. This means the statute does not clearly extend its VLT and reflectivity standard to those specific rear side windows, which is a narrower and more precise statement than claiming they are affirmatively unrestricted.
Another common misconception involves how tint darkness is judged. Some drivers assume the percentage printed on a roll of tint film is what determines legality. Indiana law and law enforcement measure the combined VLT after the film is applied to the factory glass, not the film’s standalone rating, so a film that seems compliant on paper can still produce an illegal combined reading once installed.
Laws and enforcement practices can change over time, and this article reflects the statutory text as currently verified. Checking official Indiana state sources before installing tint or relying on a medical exemption remains the most reliable way to confirm current requirements. For general information about how Lawwalls covers legal topics and the limits of this content, see the Disclaimer.
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.