What Changes on January 1, 2027?

California’s child passenger safety law has worked the same way for years: children under 8 ride in a car seat or booster in the back seat, and children 8 and older may use a regular seat belt. The problem was the word “may.” Nothing in the old law said what a properly fitting belt actually looks like on a child’s body — so an 8-year-old with a belt across the neck and a lap belt riding up on the stomach was, legally speaking, buckled up.

Assembly Bill 435 (AB 435), signed by Governor Gavin Newsom on October 7, 2025, and chaptered as Chapter 434, Statutes of 2025, fixes that gap. From January 1, 2027, the law defines “properly restrained by a safety belt” with a five-step fit test written directly into the Vehicle Code (§27360.5). A belt only counts as proper restraint if the child passes all five steps. If the child fails even one, the belt alone does not count — the child must ride in an appropriate child passenger restraint system.

The change is narrower than the headlines suggest, and that matters. The original version of AB 435, introduced in February 2025, would have raised the booster-seat age to 10 or 13, banned younger children from the front seat, and added new age and height rules. Those provisions were removed before the bill passed. The signed law keeps the existing age and height rules exactly where they are and adds one thing: a fit test. If you have read that California is “making all 13-year-olds ride in booster seats,” that is wrong — the law requires the belt to fit, with or without a booster, and a booster is only needed when the belt does not fit on its own.

One more date to keep straight: the law was signed in October 2025 and is effective (on the books) from January 1, 2026, but the new sections only become operative — meaning enforceable — on January 1, 2027. The old versions of the amended sections are repealed on the same day. For parents, only one date matters: January 1, 2027.

The 5-Step Test: The Exact Wording

Here is the test exactly as the Legislature wrote it into Vehicle Code §27360.5(c). The wording matters because this is now the legal definition of a properly fitting belt — not a recommendation, and not a DMV handout. There is no DMV test for this: nobody at the DMV will test your child. It is a check you do yourself, in your own car, before every trip that matters.

Step	What the law says	What it means in plain English	What failing looks like
1	The child is sitting all the way back against the auto seat.	Your child’s whole back — shoulders to hips — is flat against the seatback, with no gap and no perching on the edge.	The child sits forward on the seat cushion to make the belt reach, or leans away from the seatback.
2	The knees of the child bend over the edge of the auto seat.	With their back flat against the seat, the child’s knees bend naturally at the front edge of the cushion, and the feet rest flat.	The legs stick straight out because the seat is too deep, or the child has to scoot forward so the knees can bend.
3	The shoulder belt snugly crosses the center of the child’s chest and shoulder, not the child’s neck.	The belt lies flat across the middle of the collarbone and chest. It touches the shoulder, not the neck or the face, and not the edge of the arm.	The belt cuts into the neck, crosses the face, slips off the shoulder, or the child tucks it behind an arm or under the armpit to stop it chafing.
4	The lap belt is as low as possible and is touching the child’s thighs.	The lap belt sits low and snug across the tops of the thighs and the hip bones — the strong parts of the body — not the stomach.	The belt rides up on the belly, or the child has to hold it down. In a crash, a belt on the stomach can cause serious internal injuries.
5	The child can stay seated like this for the whole trip.	The child can hold the correct position — back against the seat, belt in place — for the entire journey, not just for a minute in the driveway.	The child slouches, slides down, curls up against the door, or moves the belt after ten minutes. If the belt only fits while your child is thinking about it, it does not fit.

Statutory wording: Vehicle Code §27360.5(c)(1)–(5), as added by Stats. 2025, Ch. 434, Sec. 2 (AB 435), operative January 1, 2027.

All five must pass. The law does not give partial credit. If your child passes four steps and fails one, the belt alone does not count, and the child must ride in an appropriate restraint system. For a child who has outgrown a harnessed car seat, that means a belt-positioning booster — a seat whose whole job is to lift the child so the adult belt lands in the right places. A booster is not a punishment for being small; it is the tool that makes the belt fit.

Step 5 is the one that catches families off guard. Plenty of children pass the first four steps sitting up straight in the driveway, then slide down, tuck the shoulder belt behind an arm, or fold up against the door halfway through a long drive. The law is written the way it is for exactly that reason: a belt that only fits while your child is concentrating does not protect them in a crash, because nobody holds perfect posture when they fall asleep in the car.

How to Do the Driveway Check Tonight

You do not need to wait until January 2027. The test takes about two minutes, and doing it now tells you whether your child will need a booster when the law takes effect.

• Park on level ground and use the seat your child actually rides in. Belt geometry is different in every seating position — a child can pass in the middle row and fail in the third row of the same car. Test each seat your child uses.
• Have your child sit all the way back, without a thick jacket. Bulky winter coats create a false fit: the belt looks snug over the coat, but the coat compresses in a crash and the belt goes slack. Test with the coat off, and put the coat on over the belt if it is cold.
• Buckle the belt and check steps 1 to 4 in order. Back flat, knees bending at the edge, shoulder belt across the middle of the chest, lap belt low on the thighs. Adjust the seat position if the car allows it — moving the seat forward or changing the belt anchor height can fix a borderline fit.
• Then check step 5 honestly. Ask your child to sit the way they actually sit on a long drive — not the way they sit when they know they are being tested. If they cannot hold the position, the answer is a booster, not a lecture.
• If any step fails, keep or buy a booster. A belt-positioning booster lifts the child so the lap belt sits on the hips and the shoulder belt crosses the chest. Check the booster’s own height and weight limits, and check that it fits in your car — not every booster fits every seat.
• Repeat the check every few months. Children grow in spurts. A child who fails the test in November may pass it by spring — and a child who passes it today may fail it in a different car. Recheck after growth spurts, and recheck in every car the child rides in, including grandparents’ cars.

If the test is borderline, the safe answer is the booster. The law agrees with the safety experts here: the California Highway Patrol and the Office of Traffic Safety recommend keeping children in a booster until they are at least 4 feet 9 inches tall, even after age 8, because adult belts are designed for a 165-pound adult body. The National Highway Traffic Safety Administration (NHTSA) recommends the same approach — keep the booster until the belt fits properly, with no age cutoff — and recommends that children ride in the back seat through age 12.

Who the Test Applies To

The test is not only for 8- to 15-year-olds. AB 435 writes the same five-step definition of a properly fitting belt into several parts of the Vehicle Code, so it reaches further than most coverage suggests.

Children 8 to 15 — the core rule. Vehicle Code §27360.5(a) covers a child “eight years of age or older, but less than 16 years of age.” A parent, legal guardian, or driver must not transport such a child on a highway without properly securing them in an appropriate child passenger restraint system or a safety belt meeting federal standards — and from January 1, 2027, “properly restrained by a safety belt” means passing all five steps. Note the age band carefully: it ends the day before the child’s 16th birthday, not at 16. A 15-year-old is covered; a 16-year-old is covered by the general seat-belt law instead.

The parent-present exception. The rule does not apply to a driver if the child’s parent or legal guardian is also present in the vehicle and is not the driver (§27360.5(b)). In that situation, responsibility sits with the parent or guardian who is present — not with the driver. So if grandma is driving and mom is riding along in the back with the child, mom is the one responsible for the child’s restraint, not grandma. This is the detail that matters most for carpools and family driving.

Everyone 16 and older — including the driver. The same five-step definition applies to seat-belt use by the driver and every passenger 16 and older (§27315). This is not a booster rule for teenagers. It means that a seat belt only counts as “proper” when it fits per the five steps — and that is true for everyone in the car. A small adult whose belt cuts across the neck is, strictly speaking, not properly restrained either, though the child-restraint fines do not apply to adults.

Children under 8 who are already 4 feet 9 inches or taller. A child under 8 who has reached 4 feet 9 inches may use a safety belt instead of a restraint system (§27363(d)) — and from January 1, 2027, that belt must also pass the five-step test. The height exit still exists; the test now governs whether the belt counts.

Buses. Passengers 16 and older on a bus must be belted, and passengers under 16 must be properly restrained (§27318). For children under 8 and under 4 feet 9 inches who cannot be belted for size, a restraint system must be used — or the child must be held if under 2. The old separate definition of an “acceptably restrained” bus passenger is gone. If your child rides a bus, check the operator’s rules: this is the least-covered corner of the new law, and bus companies apply it differently.

Uber, Lyft, and taxis — no exemption. AB 435 creates no rideshare exemption, and none exists in the law. The existing rule already prohibits operating a limousine for hire, an authorized emergency vehicle, or a taxicab unless the operator and front-seat passengers 8 and older are properly belted. For a rideshare trip with a small child, the practical answer is simple: bring your own seat, or do not take the trip. Do not assume the driver will have one, and do not assume the law looks the other way because it is a rideshare.

The Full Age Ladder: Old Rule vs 2027 Rule

California’s child restraint rules are a ladder: each rung is defined by age and size, and the 2027 change touches only one part of it. Here is the whole ladder in one place, so you can see what moved and what did not.

Age / size	Rule today (before Jan 1, 2027)	Rule from Jan 1, 2027
Under 2	Rear-facing car seat, in the back seat. Exception: 40+ lbs or 40+ inches tall may face forward.	No change. Rear-facing, same exceptions.
Ages 2 to 7	Car seat or booster seat, in the back seat.	No change. Car seat or booster, back seat.
Under 8 and 4′9″ or taller	May use a safety belt instead of a booster.	May use a safety belt — but the belt must now pass the 5-step test.
Ages 8 to 15	May use a safety belt (the old definition: lap belt across hips, shoulder belt across chest).	May use a safety belt ONLY if the child passes all five steps. Fail one step, and a restraint system is required.
Age 16 and older	Seat belt required (§27315).	Seat belt required — and “properly restrained” now means the same five steps for everyone.

Sources: Vehicle Code §§27360, 27360.5, 27363, 27315 (as amended by AB 435, Stats. 2025, Ch. 434, operative January 1, 2027). Under-2 and under-8 rules are unchanged by AB 435.

Two details in the table deserve emphasis. First, the under-8 back-seat rule did not move: a 7-year-old still belongs in a car seat or booster in the back seat, and the front seat is still restricted to the six exceptions listed below. Second, the 4-foot-9-inch mark is the single most important number for parents deciding whether a child still needs a booster — but from 2027, height alone is not the whole answer for an 8- to 15-year-old. A tall 9-year-old can still fail the test if the belt geometry in your car is wrong, and a shorter 14-year-old can pass it if the belt fits. Test the fit; do not guess from the birthday.

Front Seat Rules

One of the most repeated claims about AB 435 is that it bans children from the front seat. It does not. The front-seat rules for young children are unchanged — and they are stricter than most parents realize.

Children under 8 in the front seat — six exceptions only. A child under 8 in a restraint system may ride in the front seat only in one of these six circumstances (Vehicle Code §27363(e)): (1) there is no rear seat; (2) the rear seats are side-facing jump seats; (3) the rear seats are rear-facing seats; (4) the restraint system cannot be installed properly in the rear seat; (5) all rear seats are already occupied by children 7 or under; or (6) medical reasons require the child not to ride in the rear seat. Outside those six cases, an under-8 belongs in the back.

Rear-facing seats and airbags — never together. A child must not ride in a rear-facing child passenger restraint system in a front seat equipped with an active frontal passenger airbag (§27363(f)). If your truck has a passenger-airbag shutoff switch, use it when a rear-facing seat must ride in front — and check that the airbag is actually off, not just that the switch exists.

The recommendation goes further than the law. NHTSA recommends that children ride in the back seat through age 12, because front-seat airbags deploy with enough force to seriously injure a small body. That is a recommendation, not a law — but it is the reason safety experts say the back seat is the default for children well past the age the law requires it. Children under 13 sitting in front of an active passenger airbag face roughly double the risk of serious injury in a crash compared with the back seat.

Special Situations

No back seat — pickup trucks and two-seaters. This is exactly what the first front-seat exception (§27363(e)(1)) is for: if there is no rear seat, an under-8 child in a proper restraint system may ride in the front. The airbag rule still applies — never put a rear-facing seat in front of an active frontal passenger airbag. For 8- to 15-year-olds in a truck’s front seat, the five-step test applies exactly as it does anywhere else.

All the rear seats are already full. If every rear seat is occupied by a child 7 or under, an under-8 child in a restraint system may ride in the front (§27363(e)(5)). Note the age limit in the exception: the children occupying the rear seats must be 7 or under. If the rear seats are full of teenagers, the exception does not apply — the youngest child does not move to the front; someone else’s seating has to change, or you need a bigger vehicle for that trip.

Lap-belt-only back seats (older cars). A child weighing more than 40 pounds may ride in the back seat wearing only a lap belt when the back seat has no combination lap-and-shoulder belt (§27363(c)). This exception is about the vehicle’s equipment, not the child’s preference: if the car has a lap-and-shoulder belt in that seating position, the child must use it.

The 40-pound rule. Two different 40s appear in the law, and they are easy to mix up. Forty pounds or 40 inches is the threshold for moving a child under 2 out of a rear-facing seat (§27360). Forty pounds is also the threshold for the lap-belt-only back-seat exception (§27363(c)). Neither one is a booster-seat exit: a 45-pound 6-year-old still needs a car seat or booster in the back seat.

Medical conditions and special needs. A court may exempt a child from the restraint requirements if a restraint system would be impractical because of physical unfitness, medical condition, or size — and the court may require proof and evidence that no appropriate special-needs restraint system is available (§27363(a)). This is a court determination, not a doctor’s note in the glove box. If your child has a medical condition that makes standard restraints unusable, talk to the court before you assume an exemption exists — and look into special-needs restraint systems, which are made for exactly this situation.

Emergencies. In a life-threatening emergency, or when a child is being transported in an authorized emergency vehicle with no restraint system available, the child may be transported without the system — but must still be secured by a seat belt (§27363(b)). An emergency does not mean “we are in a hurry.”

Rental cars and out-of-state visitors. California law applies to anyone driving on a California highway, regardless of where the driver or the child lives. “I live in Nevada” is not a defense. Rental agencies do not reliably provide child seats — bring your own, or rent one with the car and check its fit before you drive away.

Fines, Points, and What Happens After a Ticket

This is the section where most coverage gets the law wrong, so here is the attribution stated plainly, before any number appears: AB 435 itself sets no fine and no point. The fines and the point come from older sections of the Vehicle Code that AB 435 did not change. AB 435 only changed what counts as “properly restrained.” Any article that says “AB 435 fines you $490” is wrong about where the money comes from.

What	Amount / consequence	Where it comes from
First child-restraint conviction	$100 base fine — about $490 once county penalty assessments are added	Vehicle Code §27360.6(a)(1) — pre-existing, unchanged by AB 435
Second or later conviction	$250 fine, no part waivable (except for economic disadvantage)	Vehicle Code §27360.6(b)(1) — pre-existing, unchanged by AB 435
DMV point	1 point on the driving record	Vehicle Code §12810(h) — pre-existing, unchanged by AB 435
General seat-belt violation	$20 or less first offense; $50 or less for a later offense	Vehicle Code §27315(h) and §27318(h) — pre-existing

The “about $490” total is the $100 base fine plus California’s mandatory county penalty assessments (Office of Traffic Safety figure). The all-in total varies by county — one legal guide puts it at $486. The $100 and $250 figures are the statutory base fines; the assessments are what make the ticket expensive.

Who gets the ticket? The driver — except when the child’s parent or legal guardian is present in the vehicle and is not the driver. In that case the driver is not liable under §27360.5(b), and responsibility sits with the present parent or guardian. So the answer to “grandma was driving, who pays?” is: it depends on who was in the car. If mom was riding along, mom is responsible. If grandma was alone with the grandchild, grandma is responsible.

What happens after the ticket. The court reports the conviction to the DMV (Vehicle Code §1803), which is how the 1 point lands on the driving record. For a first offense, the court may reduce or waive the $100 fine if the defendant shows economic disadvantage — and instead refer the defendant to a community education program on the proper installation and use of child restraint systems. If no such program exists within 50 miles of the defendant’s home, the program requirement is waived. The court may also require the defendant to attend an education program and present a compliant restraint system for inspection. For a second offense, the $250 fine cannot be waived except for economic disadvantage. Completing the education program can reduce or waive the fine — but nothing in the statute says it erases the point. Do not promise yourself that a class makes the ticket disappear.

Where the fine money goes. The statute allocates it: 60 percent to local health departments for community education and assistance programs — including low-cost purchase or loaner restraint systems for economically disadvantaged families; 25 percent to the county or city to administer the education program; 15 percent to the city (or county, if the violation happened in an unincorporated area). The fine funds the programs that help low-income families get seats.

Will it affect insurance? A 1-point conviction goes on the driving record, and insurers can see it. Whether your premium moves depends on your insurer and your record — the page cannot promise a number. What is certain is that the point is real, it is reported to the DMV, and it counts toward negligent-operator thresholds like any other point. If you want the full picture of how points work, see our guides to the California point system and how to read your California driving record.

What AB 435 Does NOT Do

More has been misreported about this law than almost any California traffic law in recent years. Here is the correction table — if you read any of these claims elsewhere, the claim is wrong.

Claim you may have read	The truth
“California is making all 13-year-olds ride in booster seats.”	Wrong. The law requires the belt to fit, with or without a booster. A booster is needed only when the belt does not fit on its own.
“Children are banned from the front seat until 13 (or 16).”	Wrong. That ban was in an early draft and was removed before passage. The front-seat rules for under-8s are unchanged (six exceptions, see above).
“Children under 10 must use a car seat, no exceptions.”	Wrong. That was a March 2025 draft provision (“under 10 mandatory / 10–16 test”). The signed law is 8 to 15 with the five-step test.
“There is a new height or weight requirement.”	Wrong. AB 435 adds no new height or weight number. The test is about where the belt lands on the body.
“AB 435 fines you $490 and adds a point.”	Wrong attribution. The $100/$250 fines are Vehicle Code §27360.6 and the 1 point is §12810(h) — both pre-existing. AB 435 sets no fine and no point.
“The law was signed October 14, 2025.”	Wrong. Governor Newsom approved AB 435 on October 7, 2025 (Chapter 434, Statutes of 2025).
“Uber and taxis are exempt.”	Wrong. No rideshare exemption exists in the law. Bring your own seat or do not take the trip.
“School buses are exempt.”	Wrong as a blanket claim. Bus passengers have their own rules under §27318; there is no blanket school-bus exemption in AB 435.

Why did so much coverage get this wrong? Because the early drafts of the bill really did contain the age raise and the front-seat ban, and many articles were written from those drafts and never updated when the bill was amended. The signed law is the only version that matters, and it is narrower than the drafts in every way that parents care about.

How to Prepare Now

• Do the driveway test this week. Two minutes per child, per seating position. Write down which children pass and which do not — you will forget by January if you do not.
• Keep the booster until the belt fits. If your child fails any step, the booster stays. Do not retire a booster on a birthday; retire it on a passed test.
• Get a free check. The California Highway Patrol offers free car-seat inspections by certified child passenger safety technicians at local CHP area offices. Call your local CHP office for hours and availability, and bring the seat, the child, and the vehicle manual. NHTSA also lists inspection stations nationwide.
• Check the seat itself. Read the manufacturer’s height and weight limits printed on the seat — those limits always control when to move to the next stage. Check that the seat has not been in a crash and is not expired or recalled (register the seat with the manufacturer to get recall notices).
• Tell every driver. Grandparents, babysitters, carpool drivers, and anyone else who drives your child needs to know the five steps — and needs to know that the parent-present rule makes the parent responsible when they ride along. Print the five steps and keep them in the car.
• Budget for a booster if you need one. A belt-positioning booster is far cheaper than a ticket — and if cost is a barrier, the fine money itself funds low-cost purchase and loaner programs through county health departments. Ask your local health department about them.

Sources

• Assembly Bill 435 (Wilson), Chapter 434, Statutes of 2025 — chaptered text, LegInfo: leginfo.legislature.ca.gov — AB 435
• Vehicle Code §27360.5 (5-step test; operative January 1, 2027), §27360.6 (fines), §27363 (exceptions), §27315 (seat-belt rules), §12810(h) (1 point) — text verified on california.public.law and Justia.
• National Highway Traffic Safety Administration — Car Seats and Booster Seats: nhtsa.gov — car seats and booster seats (back seat through age 12; booster until the belt fits properly).
• California Office of Traffic Safety — Child Passenger Safety: ots.ca.gov — child passenger safety (fine and point figures).
• California Highway Patrol — Child Safety Seats (free inspections by certified technicians at local CHP area offices).
• Butte County, California — California Laws and Guidelines for Child Passenger Safety (county guidance confirming the $490 all-in fine figure and the point).

Related Guides

Last verified against leginfo.legislature.ca.gov: November 2, 2026. Laws change — confirm current rules with the California Highway Patrol or the DMV before your trip.