Setareh Law
June 1, 2026
Most people know that skipping a seat belt is against the law in California — but fewer realize it can also directly reduce how much compensation they recover after a crash that was entirely someone else’s fault. California’s “seat belt defense” is a legal tool insurance companies and defense attorneys use to limit payouts to injured victims who were not buckled up at the time of a collision. Understanding how this works before a claim is filed can make a meaningful difference in its outcome.
At Setareh Law, our attorneys have recovered over $250 million for injured Californians, including victims who faced arguments about their own conduct at the time of a crash. With more than 60 years of combined experience handling California auto accident claims, we know how to push back against tactics designed to minimize what injured people are owed.
What the Seat Belt Defense Is
California Vehicle Code § 27315 — the Motor Vehicle Safety Act — requires all vehicle occupants 16 years of age and older to wear a seat belt while the vehicle is in motion. When someone who was not wearing a seat belt is injured in an accident, the opposing party may invoke the seat belt defense to argue the victim’s injuries were worsened by their own failure to buckle up.
The key distinction in California is that the seat belt defense does not affect fault for causing the accident. It only affects the damages portion of a claim. The at-fault driver who caused the crash is still responsible for the collision — but the injured person may recover less if it can be shown their injuries were made worse by not wearing a belt.
How California’s Comparative Fault System Applies
California follows a pure comparative negligence system, which means damages can be reduced based on each party’s percentage of fault. How California’s pure comparative negligence rule affects a car accident case matters greatly here — because the seat belt defense operates within this framework to assign a portion of responsibility to the injured party.
How reduction works in practice
Here is what this looks like concretely. Suppose an injured person sustains $100,000 in damages after being rear-ended by a negligent driver. If the defense can show their injuries would have been 20% less severe had they been wearing a seat belt, a jury could reduce the award by $20,000 — leaving the injured party with $80,000. The reduction applies only to the damages that the non-use of a seat belt actually made worse, not the entire claim.
This is an important limitation on the defense. It cannot be used to reduce compensation for injuries the injured party would have suffered regardless of whether they were buckled. For example, if a broken arm resulted from the impact itself and would have occurred even with proper restraint, the seat belt defense cannot be applied to that portion of the damages. Personal injury claims involving partial fault often turn on exactly these kinds of factual distinctions, and they require careful analysis.
What Insurance Companies Will Try to Do
Insurers are well-practiced at using the seat belt defense aggressively to drive down settlement offers. They may overstate the portion of injuries attributable to non-use, apply the defense broadly to injuries it does not legally cover, or use it as leverage to push injured people toward a lower early settlement. Understanding what elements are considered when determining the value of a car accident claim helps injured people recognize when an insurer is applying this argument fairly versus using it as an inflated negotiating tactic.
Seat belt non-use is just one of several vehicle-related factors that can influence a claim. How car safety features affect a personal injury claim extends to airbag deployment, vehicle safety ratings, and more — all of which can be raised by insurers during negotiations. Knowing why accepting the first settlement offer from an insurance company is often a mistake is especially relevant in cases where the seat belt defense is in play, as initial offers frequently undervalue the claim.
Contact Setareh Law to Protect the Full Value of Your Claim
Not wearing a seat belt does not mean forfeiting the right to fair compensation after a crash caused by someone else’s negligence. The law limits how this defense can be applied, and an experienced attorney can challenge overreaching arguments, retain medical evidence to isolate which injuries were actually affected, and fight for every dollar the facts support. Setareh Law handles every case on a contingency fee basis — there is no cost unless we recover for you — and with eight office locations throughout California and home visits available, getting started is simple.
If a car accident has left you injured and an insurer is using your seat belt status against you, do not let that argument go unchallenged. Contact Setareh Law today for a free consultation with our team.
