A different kind of stakes than an all-or-nothing state
Because California's pure comparative fault rule never eliminates a claim entirely over the claimant's own fault, an adjuster here isn't trying to find just enough fault to kill the claim outright the way one might in a contributory negligence state. Instead, every additional percentage point of fault the adjuster can attribute to the claimant translates directly into a smaller payout, dollar for dollar. The incentive to argue fault upward doesn't disappear in a pure comparative state — it just changes shape.
Where this argument typically comes from
A few recurring sources show up again and again in how a fault argument actually gets built in a California claim: the narrative portion of the police report and any fault indicators it contains, a recorded statement taken from the claimant early on, witness accounts, photos or video of the scene and vehicle positions, and any gaps or inconsistencies in the claimant's own medical treatment that could be framed as affecting the extent of the injury.
Why a recorded statement still deserves caution
Even in a state where fault can never end a claim outright, an early, informal recorded statement still carries real risk. A phrase like "I might have been going a little fast" or "I didn't see them until the last second" can become the basis for arguing a higher fault percentage against the claimant, directly shrinking the eventual recovery even though it can't eliminate it. This is exactly the kind of detail many people choose to discuss with an attorney before giving a recorded statement, even in a pure comparative fault state like California.
Who ultimately decides the percentage
If a case goes to trial, the trier of fact — typically a jury — assigns a specific percentage of fault to every party involved, including the claimant. Before trial, in the much more common scenario of a negotiated settlement, the fault percentage is effectively negotiated between the parties based on the available evidence, with each side arguing for a number that favors their position.
Seeing the actual financial impact
See our California comparative negligence calculator for how a specific fault percentage translates directly into a recovery amount, so the stakes of a particular fault argument are concrete rather than abstract.