Indiana Alcohol Limit: BAC Thresholds, OWI Penalties, and Refusals

The Indiana alcohol limit for driving is a blood alcohol concentration of 0.08% for drivers aged 21 and older. Drivers under 21 are held to 0.02%, and commercial drivers to 0.04%. Indiana calls the offense operating while intoxicated, or OWI, and a first violation is a Class C misdemeanor that can carry up to 60 days in jail and a $500 fine.¹

BAC Limits by Driver Category

Indiana enforces three separate thresholds, and which one applies depends on your age and the vehicle you’re driving.

Drivers 21 and older: 0.08% or higher in a non-commercial vehicle is a per se OWI. Prosecutors don’t need any additional proof of impairment beyond the test result.¹
Drivers under 21: 0.02% or higher is illegal, even without any visible signs of impairment. The near-zero cutoff still leaves room for trace alcohol from medications while catching any real drinking.²
Commercial drivers: 0.04% triggers disqualification from operating a commercial vehicle, whether the driver was on duty or not.³

An underage driver between 0.02% and 0.08% faces a Class C infraction, which means a fine but no jail time.² Hit 0.08%, and the underage driver is charged as an adult. A commercial driver convicted of an alcohol-related offense in a commercial vehicle loses the CDL for at least one year on a first offense and for life on a second. Hazmat drivers face a three-year minimum disqualification even the first time.

You Can Still Be Charged Below 0.08%

Indiana does not require a specific BAC number to bring an OWI charge. A separate statute makes it a Class C misdemeanor to operate a vehicle “while intoxicated,” and the charge rises to a Class A misdemeanor if the driving endangered another person.⁴ An officer who sees erratic driving, smells alcohol, or watches you fail field sobriety tests can pursue charges even if the breath test reads under 0.08%. This provision commonly applies to drivers impaired by a mix of alcohol and drugs, or to people who react to alcohol differently than the norm.

Implied Consent and Refusing a Test

Driving on an Indiana road counts as consent to a chemical test when an officer with probable cause asks for one. That covers breath, blood, and urine tests.⁵ Probable cause usually comes from something like swerving, the smell of alcohol, or physical signs of intoxication.

Refusing is a Class C infraction on its own, or a Class A infraction if you have a prior OWI conviction. Refusal also triggers a mandatory license suspension of one year for a first refusal, or two years if you have a previous OWI.⁶ That suspension is court-ordered and separate from any criminal OWI penalty. Refusing also disqualifies you from specialized driving privileges, and the refusal can be used against you at trial.

Penalties for a First OWI

For a first offense with no prior record, the penalty depends on how high the BAC reading went:

A Class A misdemeanor also applies when a driver at any BAC operates while intoxicated in a way that endangers another person.⁴ Courts can layer on probation, alcohol education, and community service alongside the jail time and fines.

When an OWI Becomes a Felony

Several situations push an OWI charge from misdemeanor to felony, and the numbers change quickly.

Repeat Offenses

A second OWI conviction within seven years of the prior arrest is a Level 6 felony, with six months to two and a half years in prison and up to $10,000 in fines.⁸⁹ The seven-year window runs from the date of the prior arrest to the date of the new violation. On a third or later conviction, prosecutors can seek a habitual vehicular substance offender enhancement, which adds one to eight more years on top of the underlying sentence.

OWI With a Child Passenger

Driving with a passenger under 18 while at 0.15% or higher, or while intoxicated in a way that endangers someone, is automatically a Level 6 felony for drivers 21 and older, even on a first offense.⁸

Serious Injury or Death

Causing serious bodily injury while impaired is a Level 5 felony, punishable by one to six years in prison. With a prior OWI in the past five years, the charge rises to a Level 4 felony carrying two to twelve years. Each injured person counts as a separate offense. Causing another person’s death or catastrophic injury while at 0.08% or above, with a Schedule I or II controlled substance in your blood, or while intoxicated is a Level 4 felony, with two to twelve years in prison.¹⁰

License Suspensions

Suspensions come from both the courts and the Indiana Bureau of Motor Vehicles, and they can stack. A first-offense OWI conviction with a breath test at 0.08% or higher brings an administrative suspension of at least 30 days. A second offense brings at least 180 days and up to two years. A third means at least a year and up to ten years.¹¹

Test-refusal suspensions run on their own timeline: one year for a first refusal, two with a prior OWI.⁶ Those cannot be plea-bargained away.

Some suspended drivers can petition the court for specialized driving privileges, which allow driving to specific places at specific times for work, school, medical care, or court obligations. Drivers who refused a chemical test are not eligible, and specialized privileges usually require an ignition interlock device that keeps the vehicle from starting if it detects alcohol.

Insurance and Other Financial Consequences

The court fine is often the smallest bill. After an OWI conviction, Indiana requires you to file an SR-22 certificate showing you carry the state’s minimum insurance. According to the Indiana BMV, the SR-22 requirement for insurance-related suspensions runs at least 180 consecutive days, and any lapse restarts the clock.¹²

The filing itself is cheap. The premium behind it is not. Being labeled a high-risk driver typically doubles auto insurance rates, and those higher rates can last several years. Add in interlock device costs, court fees, potential attorney fees, and lost wages from jail or license suspension, and a first-offense OWI easily runs into the thousands beyond the fine.

The Limit Applies on the Water, Too

Indiana’s 0.08% threshold also applies to boat operators, and boaters under 21 face restrictions on any measurable alcohol. Implied consent applies on the water, so operating a watercraft counts as consent to chemical testing if law enforcement suspects impairment.¹³

1
Indiana General Assembly. Indiana Code 9-30-5-1 – Class C Misdemeanor; Defense
2
Indiana General Assembly. Indiana Code 9-30-5-8.5 – Class C Infraction; Person Less Than 21 Years of Age Driving Under the Influence
3
Federal Motor Carrier Safety Administration. Disqualification of Drivers for Driving a CMV While Off-Duty With a Blood Alcohol Concentration Over 0.04 Percent
4
Indiana General Assembly. Indiana Code 9-30-5-2 – Class A Misdemeanor
5
Justia. Indiana Code Title 9, Article 30, Chapter 6 – Implied Consent; Administrative and Evidentiary Matters
6
Indiana General Assembly. Indiana Code 9-30-7-5 – Refusal to Submit; Penalties; Suspension; Proof of Future Financial Responsibility
7
Hamilton County. Hamilton Superior Court – Misdemeanor and Level 6 Felony Advisement Form
8
Indiana General Assembly. Indiana Code 9-30-5-3 – Penalties; Prior Offenses; Passenger Less Than 18 Years of Age
9
Indiana Department of Correction. Indiana Code 35-50-2 Chapter 2 – Death Sentence and Sentences for Felonies
10
Indiana General Assembly. Indiana Code 9-30-5-5 – Penalties; Death or Catastrophic Injury
11
Indiana Criminal Justice Institute. Impaired Driving
12
Indiana Bureau of Motor Vehicles. BMV: Proof of Financial Responsibility
13
U.S. Coast Guard. Blood Alcohol Content – State Boating Laws