Indiana Booster Seat Law: Age, Seating, and Penalties

The Indiana booster seat law requires every child under eight to ride in a child restraint system used according to the manufacturer’s height and weight instructions, and every child from eight through fifteen to be secured in either a child restraint or a seat belt.¹² A violation is a Class D infraction carrying a maximum $25 fine plus court costs, and a first-time offender who buys a compliant seat before the court date pays nothing.

What the Law Requires by Age

Indiana’s statute does not name a specific seat type for a specific age. For children under eight, the law requires a child restraint system installed and used according to the manufacturer’s instructions for that child’s height and weight.¹ That makes the label on your seat the legal standard. If you put a five-year-old in a booster rated to 40 pounds and your child weighs 45, you are technically out of compliance even though the child is well under eight.

The law doesn’t tell you to switch to a booster at four or to a harness at any particular milestone. It tells you to read the seat and follow it. A child might be ready for a booster earlier than you’d expect, or need to stay in a harnessed forward-facing seat longer. The seat’s own limits control.

Once a child turns eight, the requirement shifts. From eight through fifteen, Indiana law requires a child restraint system or a properly worn seat belt.² An unbuckled child in this range is the same Class D infraction as a violation involving a younger child.

When a Child Can Safely Stop Using a Booster

Age eight is the legal threshold for using a seat belt alone, but a belt designed for adults doesn’t always fit an eight-year-old. A belt that rides up on the stomach or crosses the neck can cause its own injuries in a crash. Many safety organizations recommend keeping a child in a booster until they’re about 4 feet 9 inches tall, regardless of what the law technically allows.

A practical fit check uses five conditions. The child sits all the way back in the vehicle seat. Their knees bend naturally at the seat edge. Their feet rest flat on the floor. The lap belt sits low across the upper thighs rather than the stomach. The shoulder belt crosses the collarbone, not the neck or face. And the child can hold that position for the whole ride without slouching. A child may pass in one vehicle and fail in another, so check each car they regularly ride in.

Where the Child Has to Sit

Children under eight ride in the back seat when the vehicle has one. Front-seat airbags deploy with force that can seriously injure a small child, and a rear-facing seat placed in front of an active passenger airbag puts the back of the car seat inches from the airbag at the moment it fires.

If a vehicle genuinely has no rear seat, the front is allowed as long as the passenger-side airbag is deactivated. Some vehicles have a cutoff switch; others require a dealer to disable it. For older children in boosters, the back seat remains the safer choice even though the airbag risk is lower than for infants.

Vehicles and Medical Situations the Law Doesn’t Cover

Indiana’s child restraint chapter does not apply to school buses, public transit buses, taxicabs, ambulances, motorcycles, other emergency vehicles, or antique motor vehicles. The antique exemption covers cars built before federal law required seat belts.

Rideshare vehicles like Uber and Lyft sit in a gap. The law names taxicabs but was written before rideshare existed and has not been updated to address it. Whether the taxi exemption reaches app-based rides is unsettled under Indiana law. The practical answer is to bring your own car seat, because the driver almost certainly will not have one. Lyft offers a car seat mode in a handful of cities, but not in Indiana.

A medical exemption is available if a child’s physical condition makes a restraint impractical. The certification has to come from a physician, physician assistant, or advanced practice registered nurse, and it must explain why a restraint won’t work for that child.¹ Keep the certificate in the vehicle. Without it on hand during a stop, the driver faces the standard violation regardless of the child’s condition.

Penalties for a Violation

A child restraint violation is a Class D infraction in Indiana.¹ The maximum fine is $25.³ Court costs push the actual bill much higher. Hamilton County lists $25 as the base fine for a child restraint violation, with standard traffic court costs running around $140.⁴ The penalty applies per child, so two unrestrained kids means two infractions. The same Class D infraction covers the eight-through-fifteen age group.²

The First-Time Compliance Waiver

Indiana gives first-time offenders a real break. If you receive a citation and then buy a compliant child restraint system before your court date, the court enters a judgment but waives both the fine and the court costs in full, as long as you have no prior child restraint violations.⁵ The statute says the person “is not liable for any costs or monetary judgment.” This is a complete waiver, not a reduced fine. Bring proof of purchase. For a repeat offender, the full fine and court costs apply with no waiver.

Replacing a Car Seat After a Crash

A car seat that has been through a moderate or severe crash should not be used again. Internal damage can be invisible and still compromise the seat in a future collision. NHTSA treats a crash as minor only when every one of these is true: the vehicle could be driven away, the door nearest the car seat was undamaged, no passengers were injured, no airbags deployed, and the car seat shows no visible damage.⁶ If even one of those fails, replace the seat. Auto insurance typically covers the replacement, either through the at-fault driver’s property damage liability or your own collision coverage.

Recalls and Free Installation Checks

Register your car seat so the manufacturer can reach you directly if it gets recalled. Every new seat ships with a registration card, and you can also register through the manufacturer’s website or NHTSA. To check whether a seat you already own has an open recall, search by brand and model on NHTSA’s recall lookup.⁷

If you aren’t sure your seat is installed correctly, certified Child Passenger Safety Technicians give free hands-on inspections across Indiana. They check installation, harness fit, and whether the child is in the right seat for their size. Fire stations, hospitals, and police departments across the state host regular car seat check events.

1
Indiana General Assembly. Indiana Code 9-19-11-2 – Child Less Than Eight Years of Age
2
Indiana General Assembly. Indiana Code 9-19-11-3.6 – Safety Belt Standards Child Between Eight and 16 Years of Age Child Restraint System or Safety Belt
3
Indiana General Assembly. Indiana Code Title 34 Civil Law and Procedure 34-28-5-4
4
Hamilton County, IN. Passenger Vehicle Fines and Costs
5
Indiana General Assembly. Indiana Code 9-19-11-5 – Enforcement Proceedings Acquisition by Defendant of Child Restraint System
6
National Highway Traffic Safety Administration. Car Seat Use After a Crash
7
National Highway Traffic Safety Administration. Check for Recalls Vehicle Car Seat Tire Equipment