# What is fault determination?

> Fault determination is the evaluation of who was legally responsible for an accident and in what proportion.

Glossary date: July 20, 2026.

## How it works

Insurers consider available evidence and state negligence rules. A traffic citation can matter, but it may not decide the insurance outcome by itself.

## Example

Both drivers change lanes at once. Photos, damage locations, statements, and local traffic law help determine whether they share fault.

## Why it matters

The decision can affect liability payments, deductibles, recovery, and pricing where allowed.

## What to check on your policy

Provide evidence promptly and request the facts and rule used in the decision if you disagree.

Coverage, definitions, limits, and legal requirements vary by policy and state. Your declarations page and policy forms control your coverage.

## Related terms

- [At-fault accident](https://locations.goautoinsurance.com/car-insurance-glossary/at-fault-accident.md)
- [Insurance subrogation](https://locations.goautoinsurance.com/car-insurance-glossary/insurance-subrogation.md)
- [Claims adjuster](https://locations.goautoinsurance.com/car-insurance-glossary/claims-adjuster.md)

- [Car insurance guide](https://locations.goautoinsurance.com/car-insurance-guide.md)
- [Complete glossary](https://locations.goautoinsurance.com/car-insurance-glossary.md)