Accidents aren’t always one person’s fault. Maybe you were going a little over the speed limit when someone ran a red light, or you were looking at your phone when you slipped on an unmarked wet floor. Your state’s fault rule decides whether you can still recover, and how much.
First, what is negligence?
Most injury claims are based on negligence: someone failed to act with reasonable care, and that caused your injury. To win, you generally show:
- Duty: the other person owed you a duty of care (drivers must drive safely; store owners must keep floors reasonably safe).
- Breach: they failed to meet that duty.
- Causation: that failure caused your injury.
- Damages: you suffered real losses.
Comparative fault comes in when you’re also partly responsible.
The three systems
Pure comparative fault
You can recover damages even if you were mostly at fault. Your award is reduced by your percentage of fault.
Example: Your damages are $100,000 and you’re 70% at fault. You can recover $30,000.
Modified comparative fault
You can recover only if your fault is below a set threshold, and your award is reduced by your percentage.
- 50% bar: you recover nothing if you’re 50% or more at fault.
- 51% bar: you recover nothing if you’re 51% or more at fault (so you can still recover at exactly 50%).
Example: Damages of $100,000, and you’re 40% at fault. You recover $60,000. At 60% fault, you recover nothing.
Most states use some form of modified comparative fault.
Contributory negligence
The strictest rule. If you’re found even slightly at fault, as little as 1%, you may recover nothing. Only a handful of jurisdictions still use it, and courts sometimes apply exceptions.
Look up your state
Find your state’s rule in our comparative fault rules by state table.
How fault gets decided
Insurers, and juries if a case goes to trial, assign percentages based on evidence: police reports, witness statements, photos, video, traffic laws and expert analysis. Adjusters often argue you were partly at fault to reduce what they pay. Strong evidence matters. See gathering evidence after an accident.
Common partial-fault situations
- Speeding slightly when another driver ran a light
- Not wearing a seatbelt (some states allow this to reduce damages; others don’t)
- A cyclist riding without lights at night
- A pedestrian crossing outside a crosswalk
- Ignoring a visible warning sign in a store
What to do if you might be partly at fault
- Don’t admit fault at the scene or to insurers.
- Don’t guess about speeds or distances.
- Gather evidence and talk to a lawyer, especially in a modified or contributory negligence state where a few percentage points can decide the case.
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Frequently asked questions
Can I recover if I was partly at fault?
In most states, yes, but your award is reduced by your share of fault. In a few contributory negligence jurisdictions, even slight fault can bar recovery.
Who decides the percentages?
In settlement talks, the insurers and lawyers negotiate them. At trial, the judge or jury decides.
Does not wearing a seatbelt reduce my claim?
It depends on the state. Some allow evidence of not wearing a seatbelt to reduce damages; others exclude it.
What's the difference between the 50% and 51% rules?
Under a 50% bar, you can't recover if you're 50% or more at fault. Under a 51% bar, you can recover at 50% but not at 51% or more.
This guide is general information, not legal advice. Laws change and every case is different. Talk to a licensed attorney about your situation.