Pure Comparative Fault in California.

Overview

Every personal injury case in California happens against a backdrop of shared responsibility. The plaintiff may have been distracted. A third party may have contributed. Multiple defendants may have played different roles. California's answer to all of this is pure comparative fault: a system that reduces each party's recovery by their percentage of fault but never eliminates recovery entirely.

This is one of the most plaintiff-friendly rules in the country. It is also one of the most misunderstood, especially by insurance adjusters who love to tell injured Californians that "you were partly at fault, so you have no case." That claim is almost always wrong.

From Contributory Negligence to Comparative Fault

Before 1975, California followed the common-law rule of contributory negligence: any fault by the plaintiff, no matter how small, completely barred recovery. A plaintiff found 1% at fault lost 100% of the case.

The California Supreme Court swept that away in Li v. Yellow Cab Co. (1975) 13 Cal.3d 804, adopting pure comparative fault. Three years later, American Motorcycle Assn. v. Superior Court (1978) 20 Cal.3d 578 worked out how the new system handled multiple defendants, preserving joint and several liability and creating the modern equitable indemnity framework. Proposition 51 (1986) then modified joint and several liability for non-economic damages only.

How Comparative Fault Works

The math is straightforward. The jury first determines total damages. Then it apportions fault as percentages that must add to 100%. The plaintiff's recovery is reduced by the plaintiff's percentage of fault.

• Total damages: $1,000,000
• Plaintiff found 20% at fault
• Defendants found 80% at fault collectively
• Plaintiff's net recovery: $800,000

Pure comparative fault means the reduction applies at every level, not just below 50%. A plaintiff found 70% at fault still recovers 30% of the total damages. This is where California diverges from most states, many of which bar recovery if the plaintiff is 50% or 51% at fault or more.

CACI Jury Instructions on Comparative Fault

California's standard jury instructions govern apportionment at trial. The primary instructions are:

• CACI 405 — Comparative Fault of Plaintiff. Tells the jury to determine whether the plaintiff's negligence contributed to the harm and to assign a percentage.
• CACI 406 — Apportionment of Responsibility. Directs the jury to assign percentages to every person or entity whose conduct contributed to the injury, whether or not they are defendants.
• CACI 407 — Assumption of Risk. Rarely case-dispositive in modern California but still appears in recreational and sports cases.
• CACI 463 — Affirmative Defense: Comparative Fault of Minors. Younger plaintiffs are held to a child-appropriate standard of care.

Joint and Several Liability and Proposition 51

When multiple defendants are at fault, California applies a hybrid rule:

Damage Type	Rule	Effect
Economic damages (medicals, lost earnings)	Joint and several	Any single defendant can be made to pay 100% of these damages. That defendant can then seek equitable indemnity from others.
Non-economic damages (pain and suffering)	Several only (Civil Code § 1431.2 / Prop 51)	Each defendant pays only their percentage share of non-economic damages.

Strategically, this rule preserves the plaintiff's ability to collect full economic damages from the most solvent defendant while limiting non-economic exposure per defendant.

Apportionment Among Multiple Defendants

The jury apportions fault to every person whose conduct caused the injury, whether or not that person is named as a defendant. This is the DaFonte v. Up-Right rule: empty-chair apportionment to absent tortfeasors is permitted.

For the plaintiff, the lesson is to identify and name every viable defendant before trial. Absent defendants are routinely assigned large fault shares by juries because there is no counsel present to push back.

Settlement Credits: CCP § 877

When one defendant settles before trial, the non-settling defendants are entitled to a credit against the judgment. Under CCP § 877, the credit equals the settlement amount, not the settling defendant's percentage of fault. This is sometimes called the "dollar-for-dollar" rule.

Practical consequence: when a less-culpable defendant settles early for a generous amount, the non-settling defendant's exposure shrinks by the full settlement dollars even if the jury later finds the settling defendant barely at fault.

Good Faith Settlement: CCP § 877.6

Settlements must be approved as made in "good faith" to cut off claims for indemnity and contribution by non-settling defendants. The Tech-Bilt, Inc. v. Woodward-Clyde & Assocs. (1985) 38 Cal.3d 488 framework guides the analysis: the settlement should be within the "ballpark" of the settling defendant's proportional share of liability, considering financial condition, insurance, and collusion concerns.

Good-faith approval is often routine but strategically important. A badly negotiated settlement that fails the good-faith test can leave the settling defendant still exposed to cross-claims.

Comparative Fault in Specific Contexts

Intentional torts

Some jurisdictions exclude intentional torts from comparative fault allocation. California generally allows apportionment, but intentional conduct is often weighted heavily against the intentional actor.

Strict liability (products, dog bites)

In strict-liability actions, California still applies comparative fault to reduce the plaintiff's recovery. Products liability follows Daly v. General Motors (1978) 20 Cal.3d 725.

Employer negligence in work-related accidents

Workers' compensation is generally the exclusive remedy against the employer, but third-party tort claims against non-employers proceed under standard comparative fault — subject to Privette v. Superior Court (1993) 5 Cal.4th 689 and its progeny, which limit liability to contractors' employees.

Multiple-impact auto collisions

In chain-reaction crashes, apportionment often turns on biomechanical and accident-reconstruction experts. Preserve evidence (EDR data, dashcam, scene photos) to control the fault narrative.

Defending Against Comparative Fault Attacks

The defense will always argue comparative fault. Prepare for it:

• Distraction arguments — counter with context (retail environments designed to draw attention, foreseeable smartphone use, etc.)
• Inappropriate footwear — counter with preserved shoes and a tread expert
• "Should have seen it" — counter with lighting, angles, scene photography, and a human-factors expert
• Failure to mitigate (medical) — counter with documented insurance denial, caregiving obligations, or access issues
• Empty-chair apportionment — identify the absent tortfeasor, depose anyone with knowledge, ask the court to prevent late additions that cannot be tested at trial

Comparative Fault Checklist for Case Evaluation

1. Identify every person or entity whose conduct may have contributed to the injury.
2. Determine whether each is a viable defendant (solvent, jurisdiction, within SOL).
3. Estimate a realistic fault split, in ranges, with a best case and worst case.
4. Evaluate Prop 51 exposure: which defendants are solvent for economic damages?
5. Plan for settlement-credit math: what early settlements would meaningfully reduce non-settling defendants' exposure?
6. Develop the narrative that minimizes the plaintiff's fault share: why did they act the way they did, and what did the defendants cause them to do?
7. Identify absent tortfeasors the defense may point at; decide whether to name them.

Cross-References

• Premises Liability — the framework most comparative-fault cases arise under
• Economic Damages — subject to joint-and-several rules
• Non-Economic Damages — apportioned per Prop 51
• Statute of Limitations — the SOL clock, which comparative fault does not affect
• Slip and Fall — common comparative-fault context
• Dog Bites — strict liability with provocation defense

Common Questions

Sources & Legal Citations

1. Li v. Yellow Cab Co. (1975) 13 Cal.3d 804. Abolished contributory negligence; adopted pure comparative fault in California.
2. California Civil Code § 1431.2 (Proposition 51). Non-economic damages are several (not joint) by fault share.
3. California Code of Civil Procedure § 877. Settlement credit: reduces non-settling defendants' liability by settlement amount.
4. California Code of Civil Procedure § 877.6. Good-faith settlement hearings and effect on indemnity.
5. CACI 405 — Comparative Fault of Plaintiff. Model jury instruction on apportionment of fault.
6. American Motorcycle Assn. v. Superior Court (1978) 20 Cal.3d 578. Post-Li framework for joint and several liability and equitable indemnity.