Is Arizona a No-Fault State For Car Accidents?

After a car accident, one of the first questions that comes up is whose insurance is responsible for paying for the damage. The answer often depends on whether the state follows a no-fault or at-fault insurance system.

That single fact shapes nearly everything about how car accident claims work here, from how insurance covers the loss, to who pays for medical bills, to whether you can sue the other driver. While Arizona is an at-fault state, if you grew up in or moved from a no-fault state like Florida, Michigan, or New York, the differences are significant and worth understanding before you ever need to file a claim.

This blog walks through what no-fault and at-fault systems actually are, why Arizona made the choice it did, and how the at-fault rules play out in real Arizona accidents. Along the way, we will cover the specific Arizona statutes that govern liability, insurance minimums, and the comparative negligence rule that makes Arizona one of the most plaintiff-friendly states in the country.

The Basic Differences of No-Fault vs. At-Fault

The two systems answer the same fundamental question, “who pays after a crash?” in completely different ways.

No-Fault

No-fault states require every driver to carry personal injury protection (PIP) insurance, and that coverage pays the driver’s own medical bills and certain other losses regardless of who caused the accident. Each driver’s insurance company pays for their own losses, full stop.

The trade-off is a restriction on lawsuits. In a true no-fault state, you generally cannot sue the other driver unless your injuries cross a specific threshold (a “serious injury” standard that varies by state). The system was designed in the 1970s to reduce litigation and speed up payouts on minor accidents.

At-Fault

At-fault states (also called tort states) operate on a more traditional rule. The driver who caused the accident is financially responsible for the damages, and their liability insurance pays for it. If the at-fault driver does not have enough insurance, they can be personally sued for the difference.

Lawsuits are not restricted by injury thresholds and, as a result, the injured party has full access to civil court, and damages are determined by what they can prove, not by what an insurance schedule allows. The countries that pioneered no-fault auto insurance hoped it would lower premiums and reduce court backlog, but the actual results have been mixed.

Most academic studies suggest no-fault systems do not consistently reduce premiums and can sometimes increase them. That is part of why most states, including Arizona, never adopted no-fault, and why some states that did have moved away from it.

Twelve States Use No-Fault: Arizona Is Not One of Them

Currently, twelve states operate under some form of no-fault auto insurance: Florida, Hawaii, Kansas, Kentucky, Massachusetts, Michigan, Minnesota, New Jersey, New York, North Dakota, Pennsylvania, and Utah. A handful of others (including Delaware, Maryland, Oregon, Texas, and Washington) require or allow optional PIP coverage but do not restrict lawsuits the way true no-fault states do.

Arizona has consistently been a pure at-fault state. Drivers here are not required to carry PIP. The optional equivalent in Arizona is called Medical Payments coverage (MedPay), which can pay your own and your passengers’ medical bills regardless of fault, but is not mandatory and does not change the underlying liability system.

How Arizona’s At-Fault System Actually Works

Under Arizona law, the driver who causes an accident is responsible for the resulting injuries and property damage. Their liability insurance is the primary source of payment, and if their insurance is insufficient, they can be sued personally. The injured driver has three main paths to recovery:

• Third-party claim: File a claim directly against the at-fault driver’s liability insurance
• Lawsuit against the at-fault driver personally: Used when liability insurance is inadequate or denied
• First-party claim against your own insurance: Used for uninsured/underinsured motorist coverage, MedPay, or collision coverage if you carry those policies

The choice depends on the facts of the case, the available insurance, and the size of the loss. In most straightforward Arizona accidents, the third-party claim against the at-fault driver’s insurance is the starting point.

Arizona’s Minimum Insurance Requirements: ARS 28-4009

Every Arizona driver is required to carry liability insurance under ARS 28-4009. Since July 1, 2020, the minimum limits have been:

• $25,000 for bodily injury or death of one person in any single accident
• $50,000 total for bodily injury or death of two or more people in a single accident
• $15,000 for damage to property of others in any single accident

This is commonly written as “25/50/15” coverage. It applies to all registered vehicles in Arizona, including cars, trucks, motorcycles, and mopeds. Before July 2020, the minimums were a much lower 15/30/10. The legislature raised them in recognition of how badly the older limits matched real-world accident costs.

These minimums are still often inadequate. A serious injury accident in Phoenix or Tucson can easily produce $100,000 or more in medical bills, lost wages, and property damage. If the at-fault driver carries only the 25/50/15 minimum, the injured party may recover only a fraction of their actual losses through liability insurance, with the remainder either uncollectible (if the at-fault driver has no assets) or recoverable through the injured party’s own underinsured motorist coverage if they have it.

How Arizona Handles Uninsured and Underinsured Motorist Coverage

Arizona insurers are required to offer uninsured and underinsured motorist (UM/UIM) coverage, but drivers can reject it in writing. This matters because Arizona has one of the higher uninsured driver rates in the country. In fact, the Insurance Research Council has consistently ranked Arizona in the top half of states for percentage of uninsured motorists.

UM coverage protects you when the at-fault driver has no insurance at all. UIM coverage protects you when the at-fault driver’s insurance is not enough to cover your losses. Both kick in as first-party claims against your own insurer. If you do not carry UM/UIM, your only options against an uninsured at-fault driver are to sue them personally and hope they have collectible assets, which is often a dead end.

What If You Are Partially At-Fault for a Car Accident?

This is where Arizona stands out from most other states. Arizona follows a pure comparative negligence rule under ARS 12-2505, which means you can recover damages even if you are mostly at fault for the accident. Your recovery is simply reduced by your percentage of fault.

A few examples to show how this works:

• If you are 20% at fault and your damages total $100,000, you recover $80,000
• If you are 50% at fault and your damages total $100,000, you recover $50,000
• If you are 90% at fault and your damages total $100,000, you recover $10,000

That last example surprises most people. In modified comparative negligence states (which include most of the country), being more than 50% or 51% at fault bars recovery completely. Arizona does not work that way because even a plaintiff who is 99% at fault can technically recover 1% of their damages.

A few important exceptions to comparative negligence under Arizona law:

• Intentional, willful, or wanton conduct- Under ARS 12-2505, a plaintiff who acted intentionally, willfully, or wantonly cannot use comparative negligence at all
• Drunk or drugged plaintiffs at 50% or more fault- Under ARS 12-711, if a plaintiff was under the influence and was at least 50% responsible, they cannot recover
• Plaintiffs committing felonies or misdemeanors- Under ARS 12-712, a plaintiff who was at least 50% at fault while committing a crime cannot recover

For the deeper dive, our Arizona comparative negligence breakdown walks through the rule, the exceptions, and how insurance companies use fault apportionment to drive down settlement offers.

How Fault Is Actually Determined

In an Arizona accident, fault is rarely cleanly assigned at the scene. Several layers of evidence go into the eventual fault determination:

• The police report– The responding officer’s crash report typically includes a fault determination or at least lists contributing factors. This is influential but not legally binding
• Traffic citations- Tickets issued at the scene (or later) for moving violations carry weight in the fault analysis
• Physical evidence- Vehicle damage patterns, skid marks, debris fields, and event data recorder (“black box”) readings can corroborate or contradict driver statements
• Witness statements- Independent witnesses who saw the accident are often the most credible source
• Surveillance and dashcam footage– Increasingly common, especially at busy intersections and on commercial vehicles
• Expert reconstruction- In serious or contested accidents, accident reconstruction experts analyze the scene and physics to assign fault percentages

Insurance adjusters often start with a rough fault assignment based on the police report and then negotiate from there. In disputed cases, the final determination is made by a jury at trial.

Statutes of Limitations and Government Claims

Two deadlines (statute of limitations) control how long you have to act in an Arizona accident case:

• Two years from the date of the crash to file a personal injury lawsuit, under ARS 12-542
• 180 days from the date of the crash to serve a notice of claim if you are suing a government entity (a city, county, or state agency), under ARS 12-821.01

The government claim deadline is the one that catches people off guard. If you were hit by a Phoenix sanitation truck or injured in a crash partially caused by a defective traffic signal, you have only six months to file the formal notice of claim. Miss that window and your case against the government entity is generally dead, even if you had two years to file against any private driver involved.

Common Questions About Arizona’s At-Fault System

For more on the rules that apply specifically to Arizona car accidents, our Arizona car accident laws guide goes into the deadlines, fault rules, and recovery options in greater depth.

When Fault Is the Whole Case, You Want the Right Team

Cases that come to us in Arizona usually share one feature: the insurance company’s version of the accident does not match the client’s. That gap between the two stories is where the case lives, and it is what we work to close.

Our Arizona team is based in Phoenix and handles cases across the state, from Tucson and Mesa to Flagstaff and Lake Havasu. If you were hurt and the fault question is up for debate, we are reachable at (213) 927-3700 or through our online contact form.