BSGBoosterSeatGuide

State law page

Illinois Booster Seat Laws & Requirements (2026)

Illinois requires children under 8 to be properly secured in an appropriate child restraint system.

Start with requirements Try the seat finder
FieldIllinois snapshot
Age requirementUnder 8 must be properly secured in an appropriate child restraint system.
Height requirementIDOT/ILSOS guidance points to booster use until seat belt fit, often close to 4'9".
Weight requirementUnder 2 must be rear-facing unless 40+ lb or 40+ inches; booster use depends on fit and manufacturer limits.
Fine / penaltyChild Passenger Protection Act lists $75 first violation and $200 second or subsequent violation.
Last checked2026-07-23
Verification levelOfficial state source verified
Under 2Rear-facing unless 40+ lb or 40+ inches
Under 8Appropriate child restraint system required
Booster belt ruleBoosters must use lap and shoulder belt
Fine$75 first violation; $200 second or subsequent violation

Sources

Law and source links

Agency source: https://idot.illinois.gov/travel-and-maps/safety/campaigns/buckle-up-illinois/child-passenger-safety.html

Statute/source text: 625 ILCS 25, Child Passenger Protection Act

Safety guidance

Even when Illinois law allows a seat belt, NHTSA, CDC, and AAP guidance may still recommend a booster until the vehicle belt fits properly.

Requirements guide

Understand age, height, weight, and seat belt fit.

Read requirements

Age guide

See when children typically start and stop using boosters.

Read age guide