Where California's comparative negligence rule comes from
Two separate legal ideas combine here, and it helps to keep them distinct.
The first is the underlying duty of care. California Civil Code §1714(a) states the basic principle that everyone is responsible for injury caused to another by their want of ordinary care or skill. That statute is the foundation of an ordinary negligence claim — it is why a driver who fails to use reasonable care and causes harm can be held liable.
The second is how fault is apportioned when more than one person was careless. That rule does not come from §1714. It comes from case law: in Li v. Yellow Cab Co. (1975) 13 Cal.3d 804, the California Supreme Court replaced the old "contributory negligence" rule — which barred recovery entirely if the injured person was even slightly at fault — with pure comparative negligence. Under that doctrine, damages are divided according to each party's share of the fault.
So §1714 supplies the duty; Li v. Yellow Cab supplies the way fault is shared. Explaining comparative negligence as if it were simply "Civil Code §1714" is a common shorthand, but the apportionment rule is judicial, not statutory.
What "pure comparative negligence" means in plain English
"Pure" is the key word. In a pure comparative-negligence state like California, an injured person can recover damages reduced by their own percentage of fault, no matter how high that percentage is.
A simple illustration: suppose a jury decides a collision caused $100,000 in damages, and that the injured driver was 30% at fault and the other driver 70%. The injured driver's recovery is reduced by 30%, to $70,000. If the injured driver had been found 90% at fault, they could still recover the remaining 10% — $10,000. Many other states use "modified" comparative negligence, which cuts off recovery once a person passes 50% or 51% fault. California does not have that cutoff.
These figures are illustrative, not a prediction about any real case.
How comparative negligence applies to a California car accident
Fault is rarely all-or-nothing. Comparative negligence is the framework insurers, attorneys, and juries use to divide it. Common situations where it comes up include:
- A driver is rear-ended but had a brake light out, and the other side argues that contributed to the crash;
- Two drivers each enter an intersection on a stale or disputed signal;
- A pedestrian crosses outside a crosswalk and is struck by a speeding driver — both may bear some share.
In each case, the question is not only "who caused it" but "what percentage does each person bear." That percentage directly changes how much an injured person can recover.
How fault percentages are decided
There is no formula that automatically assigns percentages. In practice they are established through evidence and negotiation, and if a case goes to trial, by a jury. Evidence that commonly influences the split includes:
- The police report and any citations;
- Photographs of the scene, vehicle damage, and skid marks;
- Independent witness accounts;
- Traffic-camera, dashcam, or surveillance footage; and
- Expert accident reconstruction in disputed cases.
Because insurers have an incentive to argue that an injured person's share of fault is higher (which lowers what they pay), the percentage is often contested. Our overview of what to do after a hit-and-run and our city guides describe the kind of documentation that helps establish the facts.
Related California laws
Comparative negligence connects to several other parts of California accident law:
- Civil Code §1714 — the general negligence duty that underlies the claim itself.
- Code of Civil Procedure §335.1 — the two-year deadline for filing most personal-injury lawsuits, explained in our guide on the California statute of limitations.
- Vehicle Code violations — a driver's breach of a specific rule of the road (speeding, failure to yield, and similar) is often used as evidence of negligence in the fault analysis.
How comparative negligence differs from contributory negligence
The distinction is historical but still causes confusion. Under the old contributory negligence rule, an injured person who was even 1% at fault recovered nothing. California abandoned that in 1975. Under pure comparative negligence, that same person recovers 99% of their damages. A handful of states still use contributory negligence or a modified version with a 50%/51% bar; California uses the pure form with no bar.
Frequently asked questions
If I was partly at fault, can I still recover anything in California?Generally yes. Under pure comparative negligence, you can recover damages reduced by your percentage of fault, even if you were more than half at fault. The recovery is lowered, not eliminated.
Who decides my percentage of fault?It is established through the claim process — insurer evaluations and negotiation — and, if the case is litigated and goes to trial, ultimately by a jury. It is not a fixed number set by statute.
Does an insurer's fault percentage bind me?No. An insurer's assessment is that company's position, not a legal ruling. It can be disputed with evidence, and if the parties cannot agree, the question can be decided in litigation.
When consulting a California attorney may be appropriate
Because comparative negligence directly reduces recovery, the percentage assigned to each side is often where the real dispute lies — and where insurers push hardest. When fault is contested, or when the injuries and losses are significant, it is generally worth speaking with a licensed California attorney who can evaluate the specific facts before you accept an insurer's fault determination. You can browse California attorneys by city and practice area in our directory.
Official sources
California Civil Code §1714 and Code of Civil Procedure §335.1 are published by the state at the California Legislative Information website (leginfo.legislature.ca.gov). Li v. Yellow Cab Co. (1975) 13 Cal.3d 804 is a published decision of the California Supreme Court. This page explains these authorities for general educational purposes and is not a substitute for reading them.
_This article is general information about California law, current as of 2026, and is not legal advice. It does not create an attorney-client relationship. For advice about a specific situation, consult a licensed California attorney._