State law page
Indiana requires every child under 8 to ride in a child restraint system used according to the manufacturer's instructions, which can be a belt-positioning booster; ages 8 to 15 need a child restraint or seat belt.
Quick answer
Indiana Code 9-19-11-2 requires a child under 8 to be properly fastened and restrained, according to the child restraint system manufacturer's instructions, in a child restraint system. Indiana State Police and the Criminal Justice Institute both confirm that a belt-positioning booster counts. From age 8 until the 16th birthday, Indiana Code 9-19-11-3.6 requires a child restraint or a seat belt in every seating position.
The statute names one number, age 8. Everything else — when to move from a harness to a booster, when a booster can be backless — comes from the seat label and manual, which the statute folds in through the phrase "manufacturer's instructions."
If your child still needs a booster, a backless model such as the Graco TurboBooster 2.0 Backless Booster Car Seat is the simplest way to meet the rule once they have vehicle head support (a lower-cost backless option works too); younger children often do better in a high-back booster. Not sure which? Use the seat finder, or run the 5-step belt fit test before dropping the booster. Shopping links — see our affiliate disclosure.
Front seat: No statutory front-seat age in Indiana Code 9-19-11. See front seat age by state for all 50 states.
Quick check
Enter age and height to see the usual next stage and the guide to read. This is a navigation aid, not a substitute for the Indiana rule above or the seat label.
Snapshot
The legal minimum first, then the practical belt-fit check families usually need next.
| Question | Indiana answer |
|---|---|
| Under 8 | Child restraint system (car seat or belt-positioning booster) per the manufacturer's instructions |
| Ages 8 through 15 | Child restraint system or seat belt in every seating position |
| Booster belt type | Lap-and-shoulder belt required; lap-only belt use with a booster is prohibited |
| Over 40 lb, no lap-and-shoulder belt free | Lap-only belt without a child restraint is allowed only when every lap-and-shoulder belt is already used by another child (IC 9-19-11-3.7) |
| Fine | Class D infraction, judgment up to $25 plus court costs |
| Source checked | 2026-09-12; Indiana Code 9-19-11-2 and 9-19-11-3.6 and Indiana State Police child passenger safety guidance were checked. |
2026 check
Indiana is upgraded to an official-source page because its rule is simple to state but easy to misread: age 8 is the only number in the statute, and the seat's own label does the rest.
For 2026 checks, the direct answer is: under 8 in a car seat or booster used according to the manufacturer's instructions; ages 8 through 15 in a child restraint or seat belt; boosters must be used with a lap-and-shoulder belt.
Indiana State Police guidance adds that children can move to a booster at 40 lb but are better in a harness until 65 lb, which is a safety recommendation rather than a statutory line.
Age rule
Indiana does not split the years under 8 into car seat and booster bands. A 3-year-old in a forward-facing harness and a 7-year-old in a backless booster are both correctly restrained under 9-19-11-2, provided each seat is used within its own limits. That makes the seat's label part of Indiana law for your child.
Indiana State Police add practical guidance the statute does not: a child should ride rear-facing until outgrowing the rear-facing seat, may move to a booster at 40 pounds, and is better kept in a harness until at least 65 pounds. Those are safety recommendations, not statutory thresholds.
Turning 8 moves the child from 9-19-11-2 to 9-19-11-3.6. The child still has to be restrained; the question becomes whether the seat belt fits without a booster.
Belt type
Indiana State Police state it plainly: belt-positioning boosters must be used with a lap-and-shoulder belt, and use with a lap-only belt is prohibited. A booster routes both parts of the adult belt; without the shoulder portion, the upper body is unrestrained.
If a seating position only has a lap belt, the answer is a different seating position or a harnessed seat rated for lap-belt installation, not a booster.
Exceptions
Indiana Code 9-19-11-3.7 covers full vehicles: if every lap-and-shoulder belt is already being used by another child, a child who weighs more than 40 pounds may ride in a lap-only belt without a child restraint. The condition is specific — all lap-and-shoulder positions occupied by children — so it does not apply to an ordinary trip with a free shoulder-belt seat.
The statute also exempts a driver who carries a certificate from a physician, physician assistant, or advanced practice registered nurse stating that a child restraint is impractical because of a physical condition.
Fines
Indiana Code 9-19-11-2 makes a violation a Class D infraction with a judgment of up to $25, deposited in the child restraint system account. Court costs are added locally.
The $25 cap is one of the lowest in the country, but the judgment is not the whole cost: court costs are added by the county, and the citation is a moving-violation record. Indiana routes the judgments themselves into a fund that buys child restraints for families who cannot afford them.
Adult claims
No. Indiana Code 9-19-11 is a child passenger restraint chapter for children under 16. A viral notice claiming Indiana requires adults under a certain height to use booster seats is not this law; see the adult booster seat law fact check. Searches using the phrase "adult booster seat" usually mean the point when a child can move from a booster to the adult seat belt.
Parent scenarios
Either satisfies the statute if used within the seat's limits. Indiana State Police recommend the harness until at least 65 pounds, because a booster depends on the child sitting correctly for the whole ride.
Legally the under-8 rule no longer applies and a seat belt satisfies 9-19-11-3.6. Safety-wise, only if the lap belt sits on the thighs and the shoulder belt crosses the chest. Many 8-year-olds still need the booster.
Not in the statute. Indiana's rule is age plus manufacturer instructions. The 4'9" figure is the safety benchmark for belt fit, and Indiana guidance uses it that way.
Do not put a booster there. Use a lap-and-shoulder position, or a harnessed seat rated for lap-belt installation. The 40-pound lap-belt exception applies only when every shoulder-belt seat is already taken by a child.
Shopping picks
Shopping links, separate from the law and safety guidance on this page; they do not change what the state requires. See our affiliate disclosure.
Cosco Topside Backless Booster Car Seat — no-frills, rated 40 to 100 lb. Common for a second car or carpool duty.
Graco TurboBooster 2.0 Backless Booster Car Seat — the best-selling backless option, with cup holders, for a child who has vehicle head support.
Graco TurboBooster 2.0 Highback Booster Car Seat — for a child who still needs head and side support, or a vehicle seat with a low head restraint.
Britax Skyline 2-Stage Belt-Positioning Booster Car Seat — converts from high-back to backless as the child approaches the thresholds on this page.
Not sure which type fits your child? Use the seat finder — enter age, height, and weight to see the stage and a matching seat.
Official sources
State safety source: Indiana State Police child passenger safety
Requirement statute: Indiana Code 9-19-11 (IGA)
Traffic safety summary: Indiana Criminal Justice Institute occupant protection for children
National safety guidance: NHTSA car seats and booster seats, CDC child passenger safety prevention, and AAP car safety seats guidance.
This page is a plain-English guide, not legal advice. Recheck Indiana Code 9-19-11-2 and 9-19-11-3.6 and state agency materials before relying on a requirement or a fine amount after a law change.
Next guides
Compare age, height, weight, and state-law requirements across the U.S.
Read requirementsUse the age and stage timeline before moving from a booster to a seat belt.
Read age guideReturn to the 50-state laws hub and compare nearby states before travel.
Open laws hubNearby states
Child passenger rules change at the state line. If you drive out of Indiana, the neighboring state's rule applies while you are there, so check it before a road trip or a regular cross-border commute.
Compare all 50 states · Seen a notice about adults under 5'2" or 5'4"? Read the adult booster seat law fact check.