Fault rules · All 50 states + DC
Short answer: if you were partly to blame for an accident, most states reduce your award by your percentage of fault. 36 states use a threshold of 50% or 51%, above which you recover nothing (in New York and Michigan only in some cases). Nine let you recover something at any percentage. Four states and DC still use contributory negligence, where even 1% of fault can bar the claim.
Fault is rarely all or nothing. A driver who ran a red light may sue a driver who was speeding. Each state decides how to split the loss, and the rule can be the difference between a reduced award and no award at all.
The table below shows the rule in every state and DC, with the statute or court decision it comes from. Last checked: October 17, 2026.
The four systems
- Pure contributory negligence. If you were at fault at all, you recover nothing. Only four states and DC still use this old common-law rule.
- Pure comparative negligence. Your award is reduced by your share of fault, whatever it is. At 90% at fault, you can still recover 10% of your damages.
- Modified comparative negligence, 50% bar. Your award is reduced by your share, but you recover nothing if you were 50% or more at fault. A 50/50 crash pays nothing.
- Modified comparative negligence, 51% bar. The same, but you are barred only when your fault is greater than the other side’s, that is, 51% or more. A 50/50 crash pays half.
South Dakota has its own rule. You can recover only if your negligence was “slight” in comparison with the defendant’s, and the award is then reduced.
Same crash, four rules
Take $100,000 in damages and change only your share of the fault:
| Your share of fault | Contributory | Pure comparative | Modified, 50% bar | Modified, 51% bar |
|---|---|---|---|---|
| 0% | $100,000 | $100,000 | $100,000 | $100,000 |
| 10% | $0 | $90,000 | $90,000 | $90,000 |
| 30% | $0 | $70,000 | $70,000 | $70,000 |
| 50% | $0 | $50,000 | $0 | $50,000 |
| 60% | $0 | $40,000 | $0 | $0 |
| 90% | $0 | $10,000 | $0 | $0 |
Two rows matter most. At 10% fault, contributory negligence wipes out a claim that every other system pays at 90%. At exactly 50%, the two modified systems split: one pays half, the other pays nothing.
Comparative or contributory negligence, by state
Recent changes and special cases
- Florida moved from pure comparative to a 51% bar for lawsuits filed after March 24, 2023, except medical negligence claims (Fla. Stat. § 768.81(6)).
- Louisiana moved from pure comparative to a 51% bar effective January 1, 2026: a plaintiff whose fault is 51% or more recovers nothing (Civil Code art. 2323, as amended by Act 15 of 2025). The act does not say whether it reaches accidents that happened before that date, so older claims may be argued either way.
- New York still uses pure comparative negligence in general, but for car crash injury suits covered by its no-fault law and filed on or after May 26, 2026, a plaintiff more at fault than the defendants is barred (new CPLR 1411(b), explained in a DFS circular letter).
- Michigan: in car crash cases, a plaintiff more than 50% at fault cannot recover damages for pain and suffering under the no-fault act. Economic losses beyond no-fault benefits are reduced by the plaintiff’s share of fault rather than barred, and the same applies outside car cases (MCL § 600.2959).
- DC keeps contributory negligence, but pedestrians, cyclists and other vulnerable road users can recover unless their negligence is greater than the total negligence of all the defendants (D.C. Code § 50-2204.52).
Who decides the percentages
In a settlement, the percentages are negotiated. The insurer makes its own estimate, and your lawyer argues against it. At trial, the jury (or the judge, without a jury) decides them, usually on a verdict form that asks for a percentage for each party.
That is why evidence from the scene matters so much: photos, the police report, witnesses, video. A few points of fault can cross a threshold. The after-a-crash checklist covers what to collect.
An insurer that decides you were 20% at fault for a claim has not settled the legal question. In a lawsuit, the jury makes its own finding.
How this table was checked
Each row was checked against the statute on the state’s own legislature site, or a free legal library copy (FindLaw, Justia, public.law) when the official site couldn’t be read; the row links to the copy that was read. Where the rule comes from a court decision rather than a statute, the row names the case and links to a copy of it. An independent second check went row by row, with one instruction: find errors. The rules have exceptions: some states apply different rules to particular claims, and many also have rules on how fault is shared among several defendants. If you spot an outdated row, send the source.
Related guides
- Personal injury statute of limitations by state.
- How contingency fees work.
- What to do after a car accident.
- Motorcycle helmet laws by state: when not wearing a helmet can reduce damages.
- Truck accident liability: claims against several parties at once.
General information, not legal advice. How fault is applied depends on the facts and the claim; ask a licensed attorney in your state about your case.