Car insurance guide
At-Fault vs. No-Fault Car Insurance: How Each System Works and Which States Use Them
Who pays after a car accident depends on where it happens. Most states, including Arizona, use an at-fault system, where the driver who caused the crash pays for the damage. Twelve states use a no-fault system, where your own insurance pays your medical costs first, no matter who caused the crash.
This guide compares the two systems, explains how shared fault works, and shows what it means for your coverage.
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How at-fault states work
In an at-fault (tort) state, the driver who caused the crash is responsible for the other people’s injuries and property damage, usually through bodily injury and property damage liability coverage. You can file a claim with the other driver’s insurer, file with your own insurer under your collision or medical coverage, or sue the at-fault driver. Most states use this system.
How no-fault states work
In a no-fault state, your own personal injury protection (PIP) pays your medical bills and part of your lost income after a crash, no matter who caused it. You can sue the other driver for injuries only if your case meets a threshold. No-fault applies to injuries; in most no-fault states, damage to cars and property is still paid by the at-fault driver’s liability coverage (Compare.com). Michigan has its own rules for vehicle and property damage.
The 12 no-fault states are Florida, Hawaii, Kansas, Kentucky, Massachusetts, Michigan, Minnesota, New Jersey, New York, North Dakota, Pennsylvania, and Utah. In Kentucky, New Jersey, and Pennsylvania, drivers can choose whether to keep the right to sue (Compare.com).
Thresholds to sue in no-fault states
No-fault states limit lawsuits in two ways:
- Verbal thresholds require a serious injury, such as a significant disfigurement or permanent injury, as defined by state law.
- Monetary thresholds require medical bills above a set dollar amount.
In choice states, a “limited tort” option usually costs less but restricts your right to sue for pain and suffering, while “full tort” keeps it.
Shared fault: comparative and contributory negligence
At-fault states also differ in how they handle crashes where both drivers share blame.
| Rule | What it means | Example: $20,000 damages, you’re 40% at fault |
|---|---|---|
| Pure comparative (e.g., Arizona, California, New York) | You recover damages reduced by your share of fault, even if you were mostly at fault. | You recover $12,000 |
| Modified comparative, 51% bar (e.g., Texas) | You recover reduced damages only if you’re 50% at fault or less. | You recover $12,000 |
| Modified comparative, 50% bar (e.g., Georgia) | You recover only if you’re less than 50% at fault. | You recover $12,000 |
| Contributory (e.g., Alabama, North Carolina, Virginia) | Any share of fault can bar you from recovering. | You may recover $0 |
Check: $20,000 × (1 − 0.40) = $12,000. At 60% fault, you’d recover $8,000 under pure comparative rules but nothing under a 51% bar. Rules can change and courts apply them case by case.
Worked example: the same crash in two states
Illustrative only. Another driver runs a red light and hits you. You have $8,000 in medical bills and $6,000 in car damage.
- In Arizona (at-fault): the other driver’s liability coverage pays your medical bills and car damage, up to their limits. You can also use your own collision or medical payments coverage and let your insurer recover the money.
- In Florida (no-fault): your $10,000 PIP pays 80% of reasonable medical bills, or $6,400, regardless of fault. The other driver’s property damage liability pays for your car. You could sue for the rest only if your injury meets Florida’s threshold.
Check: $8,000 × 0.80 = $6,400. PIP limits and percentages vary by state.
What it means for your policy
- In at-fault states: carry liability limits high enough to protect your savings, and consider uninsured motorist coverage and medical payments coverage.
- In no-fault states: you must carry PIP, and you may be able to choose higher PIP limits or coordinate it with health insurance.
- Everywhere: liability coverage still matters for damage you cause to other cars and property, and collision covers your own car.
Driving in another state
Your policy generally adjusts to meet the minimum rules of a state you’re driving in, but the crash is handled under the rules where it happened. If you move, update your policy right away; a policy written for an at-fault state may not include PIP required in a no-fault state.
PIP vs. medical payments coverage
PIP and medical payments (MedPay) coverage both pay your medical bills after a crash regardless of fault. PIP is required in no-fault states and usually also pays part of your lost income and other expenses, such as replacement services. MedPay is optional in most at-fault states, including Arizona, and generally covers only medical and funeral costs. Either can help cover health insurance deductibles and passengers in your car.
Checklist
- Find out whether your state is at-fault, no-fault, or choice no-fault.
- Check your liability limits against your assets.
- In no-fault states, review your PIP limit and tort option.
- Add uninsured motorist coverage if you don’t have it.
- Update your policy promptly if you move.
At-fault vs. no-fault FAQs
Is Arizona an at-fault or no-fault state?
Arizona is an at-fault state that uses pure comparative negligence.
Which states are no-fault?
Florida, Hawaii, Kansas, Kentucky, Massachusetts, Michigan, Minnesota, New Jersey, New York, North Dakota, Pennsylvania, and Utah.
Does no-fault insurance cover damage to my car?
No. No-fault covers injuries through PIP. Car damage is generally paid by the at-fault driver’s liability coverage or your own collision coverage, though Michigan has its own rules.
Can I sue in a no-fault state?
Yes, if your injury meets the state’s verbal or monetary threshold.
What is choice no-fault?
In Kentucky, New Jersey, and Pennsylvania, drivers can choose between keeping full rights to sue or a limited option that usually costs less.
Will an accident raise my rates in a no-fault state?
It can. Insurers still determine who caused the crash for rating purposes.
What is pure comparative negligence?
A rule that lets you recover damages reduced by your share of fault, even if you were mostly to blame.
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Not legal advice. Traffic, fault, and insurance rules summarized here are general information as of November 2026 and can change. Check current law, your court, or the Arizona MVD, or talk with an attorney about your situation.
Availability. Coverage, prices, discounts, and eligibility vary by insurer, state, and applicant, and are subject to underwriting. The issued policy controls.
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