Auto insurance Arizona drivers carry often looks adequate on paper, until it isn’t. Arizona’s minimum liability limits were set decades ago and haven’t kept pace with what a single emergency room visit costs in 2025. This guide breaks down what the minimums mean, what the law requires carriers to offer, and why “full coverage” is a phrase that appears nowhere in Arizona insurance law.
Key Takeaways:
- Arizona’s minimum liability limits are 25/50/15 under ARS 28-4009, meaning your carrier pays at most $15,000 for property damage you cause, which won’t cover most vehicles on the road today.
- Under ARS 20-259.01, Arizona carriers must offer UM/UIM coverage equal to your liability limits, but they can reduce or remove it only if you sign a specific written rejection form; verbal opt-outs don’t count.
- “Full coverage” is not a policy term recognized by Arizona law or any filed personal auto form, it has no legal definition and no guaranteed coverage set, which means two drivers paying the same premium can have very different protection.
What Arizona’s Minimum Auto Insurance Limits Actually Mean, and Why 25/50/15 Falls Short
Arizona’s minimum liability limits are the floor set by ARS 28-4009, not a recommended coverage level. The 25/50/15 structure breaks down this way: $25,000 maximum per injured person, $50,000 maximum per accident involving multiple people, and $15,000 maximum for property damage you cause. This means if you rear-end two people and total their vehicle, your carrier pays up to those capped amounts, and you personally owe anything above them.
The property damage cap is where the math breaks down fastest. Industry reporting from J.D. Power and Kelley Blue Book places the median new vehicle transaction price above $45,000 in recent model years. A $15,000 property damage limit covers roughly one-third of a median new car. If you cause an accident with a newer truck or SUV, the gap between the policy limit and the actual repair or replacement cost comes directly out of your pocket.
The bodily injury side is no better. A single emergency room visit in the Phoenix metro, without surgery, routinely runs $20,000 to $40,000. The $25,000 per-person limit can be exhausted before a patient leaves the hospital. ARS 28-4033, Arizona’s financial responsibility law, requires drivers to maintain continuous coverage at these minimums, but satisfying the statute and being adequately covered are two different things.
Arizona’s uninsured-driver problem makes this worse. The Arizona Department of Transportation has documented consistently high rates of uninsured motorists on Phoenix metro freeways, meaning the person who hits you may carry nothing at all. That’s the problem UM/UIM coverage, covered in the next section, is designed to solve.
Carrying only minimums is legal. It is also a personal financial exposure decision, not just an insurance decision. If you own a home, have savings, or carry other assets, a judgment against you for an at-fault accident can reach beyond your policy limits into those assets. Readers should consult a licensed Arizona insurance producer for advice specific to their situation before deciding where to set liability limits. This is one of the places where working with someone who has access to multiple carriers, rather than a single-carrier quote, lets you compare liability structures at different price points rather than defaulting to the minimum.
For a broader look at how liability structures work across home and auto policies together, the arizona insurance guide covers the full picture of how these limits interact.
UM/UIM Coverage in Arizona: What ARS 20-259.01 Actually Requires Your Carrier to Offer
Uninsured motorist coverage and underinsured motorist coverage address a specific problem: what happens when the person who hits you either carries no insurance or carries limits too low to cover your damages. Under ARS 20-259.01, every Arizona personal auto policy must include an offer of UM/UIM coverage at limits matching what the policyholder selected for their own liability coverage. This is not optional for the carrier. The Arizona Department of Insurance and Financial Institutions enforces this offer requirement.
The written rejection requirement is the detail most buyers miss. A carrier cannot reduce or remove UM/UIM coverage based on a verbal decline at the point of sale. ARS 20-259.01 requires a signed written rejection or reduction form. If you told your agent at purchase that you wanted to drop UM/UIM to save on premium, but you never signed a form confirming that election, your policy may still carry UM/UIM coverage. The practical implication: request a copy of your application file from your current carrier and confirm what was actually signed.
Uninsured motorist coverage pays when the at-fault driver has no coverage. Underinsured motorist coverage addresses a different trigger: it pays when the at-fault driver’s liability limits are lower than your actual damages, not only when they have no insurance at all. These are separate elections on most Arizona personal auto policies, and the distinction matters in claims. An at-fault driver with 25/50/15 minimums who causes $80,000 in bodily injury damages to you has insurance, just not enough. UIM bridges that gap.
Arizona allows stacking of UM/UIM coverage across multiple vehicles on the same policy. Stacking means the UM/UIM limits from each covered vehicle can be combined when calculating the maximum available coverage on a single claim. Carriers can exclude stacking, but only with a signed waiver. Without that waiver, Arizona law allows the stacked calculation. This is one of the most consequential coverage features most AZ drivers never hear about until they’re filing a claim.
When an uninsured driver hits you and you have no UM coverage, your only recourse is pursuing the at-fault driver personally. Collecting a civil judgment from an uninsured driver is possible in theory and rarely practical. Most uninsured drivers have no recoverable assets. The judgment sits on the books while you pay your own medical bills out of pocket.
DIFI’s enforcement role matters here. If a carrier fails to make the ARS 20-259.01 offer or processes a rejection without a proper written form, the policyholder has a basis for a complaint with the Arizona Department of Insurance and Financial Institutions. The agency maintains a consumer complaint process and can compel carriers to produce documentation of what was offered and what was signed.
Many buyers waive UM/UIM to reduce their monthly premium by $15 to $30. That savings trades away coverage that pays when the other driver can’t. For context on how these decisions intersect with other coverage choices, homeowners insurance arizona policies carry a parallel problem with liability limits that leave home equity exposed, the decision framework is similar.
What Does ‘Full Coverage’ Actually Mean on an Arizona Auto Policy?
“Full coverage” appears nowhere in Arizona insurance statutes and nowhere in any personal auto policy form filed with DIFI. The phrase has no legal definition, no standard coverage set, and no guaranteed scope. Two Arizona drivers who both believe they have “full coverage” can carry policies with dramatically different actual protection depending on what elections were made at purchase.
What most people mean when they say “full coverage” is comprehensive and collision. Comprehensive covers damage to your vehicle from events other than a collision, theft, hail, a monsoon flood, an animal strike. Collision covers damage to your vehicle from a collision with another vehicle or object. Together, those two coverages protect your car. They say nothing about what happens to the other driver, to your passengers, to your medical bills, or to your loan balance if the car is totaled.
Lenders require comprehensive and collision on financed vehicles. That requirement is about protecting the lender’s collateral, not about protecting you. A financed vehicle can satisfy every lender requirement and still carry no UM/UIM, no MedPay, no gap coverage, and a $25,000 liability limit. The lender is covered. You are not.
The table below shows what each coverage type pays, whether it qualifies as “full coverage” under the common usage of that phrase, and whether Arizona law requires it.
| Coverage Type | What It Pays | Called “Full Coverage”? | Required by AZ Law? |
|---|---|---|---|
| Liability, Bodily Injury (BI) | Medical and legal costs for people you injure | Sometimes | Yes (ARS 28-4009) |
| Liability, Property Damage (PD) | Repair or replacement of vehicles/property you damage | Sometimes | Yes (ARS 28-4009) |
| Comprehensive | Damage to your vehicle from non-collision events (theft, hail, flood) | Yes | No |
| Collision | Damage to your vehicle from a collision | Yes | No (required by lenders) |
| Uninsured Motorist (UM) | Your injuries when the at-fault driver has no insurance | No | Must be offered (ARS 20-259.01) |
| Underinsured Motorist (UIM) | Your injuries when the at-fault driver’s limits are too low | No | Must be offered (ARS 20-259.01) |
| MedPay | Medical bills for you and passengers, regardless of fault | No | No |
| Rental Reimbursement | Daily rental costs while your vehicle is repaired | No | No |
| Gap Coverage | Difference between ACV and loan payoff on a totaled vehicle | No | No |
A lender’s requirement for “full coverage” on a financed vehicle means comprehensive and collision only. UM/UIM, MedPay, and gap coverage are separate elections that the lender’s requirement does not address.
MedPay, Rental, and Gap Coverage: The Add-Ons Most Arizona Drivers Skip Without Realizing the Exposure
Arizona is not a no-fault state. Per the NAIC state profile for Arizona, the state does not require Personal Injury Protection (PIP) coverage on personal auto policies. MedPay is the closest available option, it pays medical expenses for you and your passengers regardless of who caused the accident. That distinction matters when fault is disputed, when you caused the accident yourself, or when an investigation drags on for months while hospital bills arrive.
MedPay coverage pays medical bills for you and passengers regardless of fault, making it distinct from UM/UIM (which only pays when another driver is at fault or underinsured) and from health insurance (which may come with deductibles, network restrictions, and subrogation claims against any eventual settlement). The coverage amounts on most AZ policies are modest, $1,000 to $5,000 is a common range, but that amount can cover an urgent care visit or ambulance ride that health insurance processes slowly.
Here are the four add-ons most Arizona drivers skip, and the specific exposure each one closes:
- MedPay: Covers medical bills for you and your passengers regardless of fault. Arizona has no PIP requirement, so without MedPay, first-party medical coverage in an at-fault accident falls entirely to your health insurance, with all its deductibles and delays.
- Rental Reimbursement: Pays for a replacement vehicle while yours is being repaired after a covered claim. Many Arizona policies cap this at $30 per day, which doesn’t cover most rental rates in the Phoenix metro market today. Check the daily limit, not just whether the coverage exists.
- Gap Coverage: Pays the difference between what your vehicle is worth at the time of a total loss (actual cash value) and what you still owe on the loan. New vehicles can depreciate faster than loan balances decrease in the first one to three years, gap coverage closes that shortfall so a totaled car doesn’t leave you making payments on nothing.
- Roadside Assistance: Covers towing, lockout, and fuel delivery. The coverage is low-cost and high-utility, but many drivers already have equivalent benefits through a credit card or AAA membership. Check for duplication before electing it, paying twice for the same benefit is common and easy to avoid.
None of these coverages appear on an Arizona personal auto policy by default. Each requires a specific election at purchase or renewal. The thing most guides miss: reviewing these elections at every renewal matters as much as the original purchase decision, because rental rate caps and loan balances change while policy defaults often don’t.
For riders who carry both a vehicle and a motorcycle policy, motorcycle insurance arizona has its own version of these gaps, particularly around MedPay and the year-round riding exposure that affects AZ premiums.
How to Evaluate an Arizona Auto Policy Without Getting Burned on Price Alone
An Arizona car insurance agent should review UM/UIM elections, liability adequacy, and add-on gaps before quoting a replacement policy. Price comparison without coverage comparison is how drivers end up with cheaper premiums and worse protection. The steps below apply whether you’re reviewing an existing policy or shopping a new one.
- Pull your current declarations page and read the UM/UIM limits you elected. Not what you think you elected, what the declarations page says. Many buyers discover their UM/UIM limits are lower than their liability limits, or that UM and UIM are listed separately with different amounts.
- Request a copy of any UM/UIM reduction or rejection form you signed at original application. Your current carrier is required to have this on file. If no signed form exists and your policy shows reduced or waived UM/UIM, that’s a question worth raising with DIFI’s consumer services division.
- Compare your liability limits to your actual net worth exposure. If you own a home in Arizona, the gap between a $25,000/$50,000 limit and a six-figure bodily injury claim reaches into your equity. The Arizona Department of Insurance and Financial Institutions recommends that drivers consider their assets when selecting liability limits, not just the ARS 28-4009 minimums.
- Verify your rental reimbursement daily limit against current rental rates in your area. A $30/day cap set three years ago doesn’t reflect what a compact car costs to rent in Phoenix today. Adjusting this limit at renewal is usually inexpensive.
- Calculate your loan payoff versus your vehicle’s current actual cash value. If you owe more than the car is worth, gap coverage is still relevant. Once the payoff drops below ACV, gap coverage is no longer necessary and can be removed to reduce premium.
- Confirm your MedPay election and the coverage amount. A $1,000 MedPay limit may not cover a single Phoenix-area ER visit. Many carriers offer higher MedPay limits at modest incremental cost, review the options.
ARS 28-4135 creates civil penalties and potential license suspension for driving without proof of financial responsibility in Arizona. Coverage lapses create exposure beyond the uninsured period itself, the penalty structure means a gap in coverage can affect your license status even after coverage is reinstated.
This is also where working with an agency that has access to 200+ carriers makes a practical difference. Comparing liability and UM/UIM structures across multiple carriers, rather than accepting the renewal terms from a single carrier, is how you find the right coverage level at the right price. If you’ve received a non-renewal notice or a sharp renewal increase, the choices narrow and the review process becomes more urgent, understanding what to do when that notice arrives is a separate problem worth getting ahead of.
For drivers in the East Valley, The Gebhard Agency’s Mesa office serves the Phoenix metro area and statewide Arizona. The insurance agency chandler az and surrounding communities are part of the service area, and the arizona insurance agency locations page covers the full geographic reach. Consult a licensed Arizona insurance producer for advice specific to your situation before making changes to liability limits or UM/UIM elections.
Frequently Asked Questions
What is the cheapest legal car insurance I can get in Arizona?
The cheapest legal option is a policy meeting Arizona’s minimum liability limits under ARS 28-4009: $25,000 per person and $50,000 per accident for bodily injury, plus $15,000 for property damage. Under ARS 20-259.01, your carrier must offer UM/UIM coverage, which you can decline in writing to reduce the premium. Driving at state minimums is legal, but it leaves your personal assets exposed if you cause an accident that exceeds those limits.
What’s the best auto insurance in Arizona for someone who owns a home?
For Arizona homeowners, the most consequential coverage decisions are liability limits and UM/UIM selection, not premium alone. A homeowner with equity has personal assets exposed if an at-fault accident produces damages above the $25,000/$50,000 bodily injury minimum, so most licensed Arizona producers recommend limits well above the statutory floor. Working with an agent who has access to multiple carriers lets you compare liability and UM/UIM structures across policies rather than accepting whatever a single carrier offers at renewal.
Can I reject UM/UIM coverage entirely on my Arizona auto policy?
Yes, but only with a signed written rejection form. Per ARS 20-259.01, Arizona carriers must offer UM/UIM coverage equal to your liability limits, and reducing or eliminating it requires a specific written election, a verbal decline at purchase does not satisfy the statute. If you did not sign a written form, your policy may still carry UM/UIM coverage even if you believed you had declined it, so request a copy of your application file from your current carrier to confirm what was elected.