Quick answer: Four systems decide what happens when an injured person shares the fault. Pure comparative negligence reduces your damages by your share of fault and never bars you. Modified comparative negligence does the same but bars you at 50% or 51% fault, depending on the state. Contributory negligence bars you if you were even 1% at fault. Which one applies depends on your state.
On this page:
- Why your share of fault matters
- Pure comparative negligence
- Modified comparative negligence
- Contributory negligence
- The four systems side by side
- Rules change, so check your state
- Next steps
Why your share of fault matters
Accidents are often not one person's fault alone. Comparative negligence is the tort principle courts use to reduce the damages a plaintiff can recover according to the degree of negligence each party contributed. If a court assigns 60% of the fault to the defendant and 40% to the plaintiff, the plaintiff may recover only 60% of the damages. How much that matters, and whether you recover anything at all, depends on which system your state follows. The guide on what happens if you are partially at fault covers the practical side.
Pure comparative negligence
Under pure comparative negligence, the state lets the plaintiff claim damages for the share they are not at fault for, even when they are 99% at fault. The Legal Information Institute says almost one-third of states follow this rule. Two statutes show the wording. In Washington, any contributory fault chargeable to the claimant diminishes proportionately the amount awarded as compensatory damages, but does not bar recovery (RCW 4.22.005). New York's rule is to the same effect (CPLR 1411).
Modified comparative negligence
Most states use a modified version, which still reduces damages by your share of fault but adds a cutoff. According to the Institute there are two kinds: under the 50 percent bar rule the plaintiff may not recover if found 50% or more at fault, and under the 51 percent bar rule the plaintiff may not recover if assigned 51% or more. Some state examples:
- Texas follows the 51 percent bar: a claimant may not recover damages if his or her percentage of responsibility is greater than 50 percent (Tex. Civ. Prac. & Rem. Code 33.001).
- Florida also bars a party found to be greater than 50 percent at fault for his or her own harm, with an exception for medical negligence actions (Fla. Stat. 768.81(6)).
- North Dakota works like a 50 percent bar: fault as great as the combined fault of the others bars recovery (N.D.C.C. 32-03.2-02). Utah is similar: a claimant may recover only from defendants whose fault exceeds the claimant's own (Utah Code 78B-5-818).
Contributory negligence
Contributory negligence is the old common law rule. A plaintiff who is at all negligent cannot recover, and the degree of fault is irrelevant, so a plaintiff 1% at fault receives nothing from a defendant 99% at fault. Courts developed exceptions over the years; under the last clear chance doctrine, a negligent plaintiff can still recover if the defendant was the only party able to prevent the harm and failed to do so. The Institute lists Alabama, Maryland, North Carolina, Virginia and the District of Columbia as the places that still use the rule.
The four systems side by side
Here is how the same case plays out under each system, using a made-up $100,000 in damages. The figures apply each rule as described above, and your state's rule decides which column applies.
| Your share of fault | Pure comparative | 51 percent bar | 50 percent bar | Contributory |
|---|---|---|---|---|
| 20% | $80,000 | $80,000 | $80,000 | $0 |
| 50% | $50,000 | $50,000 | $0 | $0 |
| 60% | $40,000 | $0 | $0 | $0 |
To run your own numbers with your state's actual rule, use the Comparative/Contributory Negligence Calculator.
Rules change, so check your state
Legislatures revisit these rules. Florida's statute is a recent example: its cutoff for a party more than 50 percent at fault is in subsection (6) of section 768.81, whose history includes a 2023 amendment (chapter 2023-15). Legal references written before that change may still describe Florida as a pure comparative state. Always confirm the rule in force in your state before relying on a general summary like this one.
Next steps
Fault is only one thing that shapes what a claim is worth; see what damages you can recover for the rest. The personal injury calculators cover every state, and our methodology page explains how each figure is verified. For advice on your own case, talk to a licensed attorney in your state.