What is comparative negligence, and which rule does my state use?

Updated October 6, 2026 · General information, not professional advice

What is comparative negligence?

What is comparative negligence? It's the rule courts and insurers use when an injured person was partly to blame. Your total damages are reduced by your percentage of fault. If your damages are $100,000 and you were 20% at fault, you recover $80,000.

States differ on what happens when your share of fault is large. There are four main systems.

Comparative negligence applies in most injury cases: car crashes, falls, bike and pedestrian accidents, and many others. The idea is that each person pays for their own share of carelessness. The jury or judge, or the insurer during negotiations, assigns each person a percentage, and those percentages add up to 100%.

The four fault systems, with the states that use each

• Pure comparative negligence: you can recover even if you were 99% at fault, reduced by your share. States: Alaska, Arizona, California, Kentucky, Mississippi, Missouri, New Mexico, New York, Rhode Island and Washington.
• Modified comparative, 51% bar: you recover only if your fault is not greater than the other side's, so you're barred at 51% or more. States: Connecticut, Delaware, Florida, Hawaii, Illinois, Indiana, Iowa, Louisiana, Massachusetts, Michigan, Minnesota, Montana, Nevada, New Hampshire, New Jersey, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, Texas, Vermont, West Virginia, Wisconsin and Wyoming.
• Modified comparative, 50% bar: you recover only if your fault is less than the other side's, so you're barred at 50% or more. States: Arkansas, Colorado, Georgia, Idaho, Kansas, Maine, Nebraska, North Dakota, Tennessee and Utah.
• Pure contributory negligence: any fault on your part, even 1%, can bar recovery. Jurisdictions: Alabama, Maryland, North Carolina, Virginia and Washington, D.C.

South Dakota uses its own "slight vs. gross" rule: you can recover only if your negligence was slight compared with the other party's.

Recent changes to state fault rules

• Louisiana switched from pure comparative fault to a 51% bar for accidents on or after January 1, 2026.
• Florida moved from pure comparative to a 51% bar in March 2023; medical negligence cases are excluded.

Which rule applies usually depends on when the accident happened, not when you file. Some states also have special twists; Michigan, for example, limits non-economic damages for a plaintiff who is more than 50% at fault.

Examples: the same crash in different states

Say a jury finds your damages are $50,000 and you were 50% at fault:

• Pure comparative state: you recover $25,000.
• 51% bar state: you recover $25,000, because 50% is not greater than the other side's 50%.
• 50% bar state: you recover nothing.
• Contributory negligence state: you recover nothing.

With multiple defendants, states also differ on whether your fault is compared to each defendant or to all of them combined.

How fault is decided in practice

Fault percentages come from the evidence: police reports, traffic laws, witness statements, photos, video, vehicle data and expert analysis. A police report's conclusion is important but not final; insurers and juries can disagree with it.

Common arguments that shift fault onto the injured person include speeding, distraction, not wearing a seat belt (allowed as evidence in some states but not others), ignoring warning signs, and failing to avoid an obvious hazard. Gathering your own evidence early, especially witness names and video, is the best way to push back against an unfair fault estimate.

Why your fault percentage matters in negotiations

Insurers use these rules in settlement talks. An adjuster who says you were "30% at fault" is proposing a 30% cut, and in a 50% or 51% bar state may push the number higher to deny the claim. Fault percentages are opinions until a jury decides, and evidence such as photos, witness statements and video can change them. In a contributory negligence state, even a minor fault argument can be decisive.

An injury lawyer in your state can explain how fault is likely to be argued in your case; injurylawyers.si can list injury law firms near your ZIP code. This page is general information, not legal advice.