This glossary entry provides general legal information for educational purposes only. It is not legal advice and does not create an attorney-client relationship. Legal terms are applied differently depending on the facts of each case and the jurisdiction. Consult a licensed California attorney for guidance specific to your situation.
Comparative fault (also comparative negligence) is a tort doctrine that apportions liability among parties based on their proportionate share of fault for an injury. Under California's pure comparative fault rule, a plaintiff's recovery is reduced in direct proportion to the plaintiff's own percentage of fault, with no threshold that bars recovery. See Li v. Yellow Cab Co. (1975) 13 Cal.3d 804; Cal. Civ. Code § 1714.
California's system for dividing accident blame among parties — reduces but doesn't eliminate recovery based on your share of fault.
Comparative Fault in Personal Injury Cases
Comparative fault is one of the most practically significant doctrines in California personal injury law — it governs how damages are divided any time more than one party contributed to an accident.
California adopted pure comparative fault in Li v. Yellow Cab Co. (1975), replacing the old contributory negligence rule that completely barred recovery if the plaintiff was even 1% at fault. Under the current system, fault is allocated by percentage among all parties — defendants, the plaintiff, and potentially absent third parties.
How juries apply it. At trial, the jury is asked to assign a fault percentage to each party. If the plaintiff is found 30% at fault and the defendant 70% at fault in a $100,000 case, the plaintiff recovers $70,000. If there are multiple defendants, each pays their proportionate share (subject to joint and several liability rules under Prop 51 / Civ. Code § 1431.2).
Proposition 51 and joint and several liability. Under California Civil Code section 1431.2, defendants are jointly and severally liable for economic damages (meaning any one defendant can be required to pay the full amount of economic damages) but are only severally liable for non-economic damages (each defendant pays only their percentage share). This matters significantly when one defendant is insolvent.
Insurance adjuster tactics. Insurance companies frequently argue comparative fault to reduce their payout. Common examples: arguing the pedestrian was jaywalking, the motorcyclist was speeding, the slip-and-fall plaintiff wasn't watching where they were walking. These arguments directly reduce the insurer's liability by the assigned fault percentage.
Settlement context. Comparative fault affects settlement negotiations as well as verdicts. Attorneys evaluate both parties' potential fault exposure when advising on settlement value.
In any action for personal injury, property damage, or wrongful death, based upon principles of comparative fault, the liability of each defendant for non-economic damages shall be several only and shall not be joint. Each defendant shall be liable only for the amount of non-economic damages allocated to that defendant in direct proportion to that defendant's percentage of fault.
How Comparative Fault Works in Practice
A useful illustration: A driver (Driver A) runs a yellow light and collides with Driver B, who was speeding. The jury finds Driver A 60% at fault and Driver B 40% at fault. Driver B's total damages are $200,000.
Under pure comparative fault, Driver B recovers $120,000 (60% of $200,000) from Driver A. Driver A may also assert a cross-claim against Driver B for any injuries Driver A sustained, reduced by Driver A's 60% share of fault.
In practice, this means neither side wins automatically based on the other's fault. Investigators reconstruct accidents, examine speed data, review dashcam footage, and retain accident reconstruction experts specifically to argue about fault percentages — because every percentage point is worth thousands of dollars in a significant case.
Self-represented claimants often accept low settlement offers without fully understanding that a partial fault finding still allows substantial recovery. Understanding comparative fault helps claimants evaluate whether an offer appropriately accounts for their situation.
State-by-State Variations
California's pure comparative fault rule is more plaintiff-friendly than the majority of states. The key distinction is what happens when the plaintiff's fault exceeds 50%:
In pure comparative fault states (California, New York, Florida, Louisiana, Alaska, Arizona, Kentucky, Mississippi, Missouri, New Mexico, Rhode Island, Washington), a 99%-at-fault plaintiff can still recover 1% of damages. This is rarely litigated but shows the full scope of the doctrine.
In modified comparative fault states (the majority of states), recovery is barred when the plaintiff's fault reaches a threshold — either 50% (so plaintiff must be less than 50% at fault) or 51% (plaintiff must be 50% or less at fault). Most states fall into this category.
A handful of states historically applied contributory negligence — any plaintiff fault bars recovery entirely. Maryland and Virginia still retain this doctrine for general negligence, making those states highly unfavorable for plaintiffs with any shared responsibility.
The practical impact: a claimant who is 45% at fault in California recovers 55% of damages. The same claimant in a modified comparative fault state might recover nothing if the threshold is 50%.
Related Legal Terms
Negligence
The underlying tort claim whose damages are allocated through comparative fault analysis.
Economic Damages
The category of damages subject to joint and several liability under Proposition 51.
Non-Economic Damages
The category of damages for which each defendant pays only their proportionate share.