What pure comparative fault means
If a jury decides your damages are $100,000 and that you were 30% responsible, you recover $70,000. If they decide you were 80% responsible, you recover $20,000. California adopted this “pure” form of comparative negligence in Li v. Yellow Cab Co. (1975) 13 Cal.3d 804.
This is more generous than many states, where being 50% or 51% at fault can bar recovery entirely. In California there is no cut-off — the reduction is simply proportional all the way up.
A related rule applies when more than one defendant is at fault: for non-economic damages such as pain and suffering, each defendant pays only its own percentage share (Civil Code § 1431.2, enacted by Proposition 51).
Who decides the percentage
Ultimately a jury (or a judge or arbitrator, depending on how the case is decided), if the case goes that far. In practice, an adjuster's initial assessment of fault can set the tone for the negotiation, and that assessment is an opening position rather than a finding.
Early fault assessments are often based on very little: a police report narrative, a recorded statement taken while you were still shaken, and the other driver's account. All three are challengeable.
Where fault percentages come from in practice
Physical evidence, independent witnesses, and any contemporaneous record. This is why photographs taken at the scene are worth more than any argument made months later, and why our timeline worksheet asks for detail that seems irrelevant at the time.
Do not concede fault to be polite
Saying “I'm sorry, I didn't see you” at the scene is a human reflex and it can be quoted back to you. California law keeps pure expressions of sympathy out of evidence as an admission, but not statements of fault (Evidence Code § 1160). Check on people, exchange details, and leave the analysis of who did what to the investigation.
Photograph the scene if it is safe to do so
Ideally before vehicles are moved: position, damage, road conditions, signage, sightlines. Photos taken at the scene are hard to recreate later.
Get independent witness details
Not the other party's passengers. Names and phone numbers — statements can be taken later.
Decline to give a recorded statement immediately
You are not obliged to give one to the other side's insurer, and doing so before you have the police report often does not help you.
Write your own account within 48 hours
Memory for sequence degrades quickly and specifically.
Common questions
Can the other side's insurer just declare me 50% at fault?
Does a traffic citation decide fault?
Official sources
- primary (full-text mirror): Li v. Yellow Cab Co. (1975) 13 Cal.3d 804
- Civ. Code § 1431.2 (Prop 51)
- Evid. Code § 1160
- Veh. Code § 40834
About this guide
Last reviewed September 2026 by the LA Law Hub editorial team against the official sources listed above. Laws, court rules, fees and local ordinances change, and how they apply depends on facts this guide cannot know. LA Law Hub is not a law firm. This guide is general information, not legal advice, and reading it does not create an attorney-client relationship. For advice about your own situation, speak with a lawyer licensed in California.
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