Not Wearing a Seat Belt? Your California Injury Claim

Someone else caused the crash, but you were not buckled in, and now the adjuster keeps bringing it up. Maybe you had just pulled out of a parking lot, maybe you were in the back seat of a friend's car, maybe you simply forgot. This post explains whether you can still recover in California, how the "seat belt defense" actually works, and what the insurance company has to prove before it can use it against you.

The short version: not wearing a belt does not erase your claim. It can reduce it, but only if the other side proves the belt would have made a difference to your specific injuries.

Yes, you can still bring a claim

Not being buckled did not cause the other driver to run the red light or rear-end you. The crash is still their fault. What your seat belt use can affect is how badly you were hurt, and so how much of your harm the other driver should pay for.

California's seat belt statute says this directly. Vehicle Code § 27315 requires drivers and passengers 16 and older to be properly restrained, but the same section says a violation "does not establish negligence as a matter of law or negligence per se for comparative fault purposes." In plain English: the ticket-level violation does not automatically cut your recovery.

The Court of Appeal explained the reasoning in Housley v. Godinez (1992). The Legislature wrote that language to prevent the "automatic and invariable reduction of awards," while still letting a jury consider whether a reasonable person would have worn the belt.

What the insurer has to prove

The seat belt defense is an affirmative defense. That means the defense carries the burden, not you. California's civil jury instruction on it, CACI No. 712, lists four things the defendant must prove:

• A working seat belt was available.
• A reasonably careful person in your situation would have used it.
• You failed to wear it.
• Your injuries would have been avoided or less severe if you had used the belt.

The first three are often easy for them. The fourth is where the fight is. It is not enough for the adjuster to say "you weren't wearing a belt, so we are knocking off a third." They have to connect the missing belt to the particular injuries you have.

Why the fourth element usually needs an expert

Whether a belt would have changed an injury is a medical and engineering question, not common sense. Housley approved a jury instruction telling jurors to decide, "with expert testimony," what injuries the plaintiff would have sustained if the belts had been used. The notes to CACI No. 712 say expert testimony will generally be required on that point, while acknowledging it is not always required.

That matters in practice, because the question is injury by injury, not crash by crash. For each injury you claim, the defense has to show how a belt would have changed it. Questions worth pressing:

• What direction did the impact come from, and would a belt have kept you out of the part of the car that hurt you?
• Which specific injuries does the defense say were caused or worsened by not being belted, and which do they concede would have happened anyway?
• Who is the expert saying so, and what did they actually review: the vehicle, the photos, your medical records?

The strength of the defense depends on the answers, not on the bare fact that you were unbuckled.

How it changes the number

California uses pure comparative negligence. If a jury finds you were partly responsible for your own harm, your damages are reduced by your share, and you still recover the rest. There is no cutoff where a partially-at-fault person gets nothing.

Applied to seat belts, the question is not "who caused the crash." It is "how much of this injury would the belt have prevented." If a jury decides some portion of your harm is attributable to not wearing the belt, that portion comes off. The other driver still pays for the rest, including everything the belt would not have prevented.

Insurers tend to skip that nuance in negotiation. Expect an adjuster to float a large, round reduction with no medical support behind it. You do not have to accept their percentage as if it were a finding. Ask what injury they claim the belt would have prevented and what evidence they have. The broader logic of how pain and suffering is valued in California still applies; the belt question only adjusts the result.

Who has to wear a belt, and the edges of the rule

Under § 27315, the driver and every passenger 16 or older must be properly restrained on a highway, with the lap belt across the hips or upper thighs and the shoulder belt, if there is one, across the chest. That includes back-seat passengers.

A few points come up often:

• Children under 16. The directions for CACI No. 712 note that the seat belt statute applies only to people 16 and older, and that no case has addressed comparative fault for younger occupants who were not belted.
• Medical exemptions. The statute exempts people with a physical or medical condition certified by a physician or chiropractor.
• Wearing it wrong. A shoulder belt tucked behind your back is not "properly restrained" under the statute's definition, and the defense may argue it the same way as no belt.
• No working belt. If the belt was broken or missing, the first element of the defense, a working seat belt, is not met.

Most Californians do buckle up. SafeTREC at UC Berkeley reports California's front seat belt use rate was 96.2 percent in 2023, the third highest in the country. That is part of why juries may view not wearing one as unreasonable, and why your claim should not rest on arguing that belts do not matter. It should rest on what the evidence shows about your injuries.

What this means in California

The seat belt issue does not change your deadlines. The general personal injury statute of limitations under CCP § 335.1 is two years from the date of injury. If a city bus, a public employee's vehicle, or a dangerous public road was involved, a formal government claim is usually due within six months, and that deadline is not affected by any fault argument.

Fault itself works the same way here as everywhere else in California: pure comparative negligence. A seat belt argument can reduce what you recover. It cannot, by itself, bar your claim.

What to do now

Be accurate about the belt. If you were not wearing one, do not say you were; other records of the crash may say otherwise, and credibility is worth more than any single fact. At the same time, you do not need to volunteer a guess about whether a belt would have helped. That is a question for doctors and engineers, not something to concede in a recorded statement.

Keep the vehicle, or at least detailed photos of the interior, the belt, and the points of impact, before it is repaired or salvaged. Get treated and follow through, because the medical record is what a belt argument ultimately gets measured against. If you were hit from behind, the fault analysis in rear-ended in California still controls who caused the crash.

If an adjuster is using the seat belt to justify a low offer, a free consultation costs nothing and there is no fee unless there is a recovery.