Glossary

At-fault state

A state where the driver who caused a crash, through their liability insurance, pays for other people's injuries and property damage.

Also called: tort state, fault state, tort system

An at-fault state, also called a tort state, follows the traditional rule for car crashes: the driver who caused the accident is legally responsible for the harm, and that driver's liability coverage pays the injured people's medical bills, lost wages, pain and suffering and vehicle damage, up to the policy limits. Injured people can claim against the at-fault driver's insurer or sue the driver.

Most states work this way. According to the Insurance Information Institute, 12 states plus Puerto Rico have no-fault insurance laws, under which each driver's own personal injury protection pays first for injuries and lawsuits are restricted. Even in no-fault states, damage to vehicles is generally handled on a fault basis.

In an at-fault state, how fault is divided matters. Most use comparative negligence, which reduces your recovery by your share of the blame; a handful use contributory negligence, which can bar recovery entirely. Because you depend on the other driver's insurance, consider uninsured and underinsured motorist coverage and medical payments coverage to protect yourself when the at-fault driver has too little coverage or none. See no-fault vs at-fault states.

Last reviewed October 4, 2026

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Related terms

No-fault insurance A system in which your own policy pays your injury costs after a crash regardless of who caused it, with limits on suing the other driver. Tort A civil wrong, such as careless driving, that injures someone and gives the injured person the right to sue for money damages. Liability coverage The part of a car insurance policy that pays for injuries and property damage you cause to others, plus your legal defense, up to your limits. Add-on state A state where your policy includes or offers injury benefits like PIP that pay regardless of fault, with no limit on suing the at-fault driver. Comparative negligence A fault rule that reduces an injured person's recovery by their own share of blame for a crash, instead of barring recovery entirely.

Related guides

Liability car insurance explained What auto liability insurance pays for, what it never covers, how a liability claim works, and why your limits matter more than the price. No-fault vs at-fault states How no-fault and at-fault systems differ, which states use each, the lawsuit thresholds in no-fault states, and what it means for your claim.