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Updated: January 2026
You were hit in Phoenix, and more than one other driver did something wrong. Maybe it was a chain-reaction rear-end on the I-10. Maybe a commercial truck and a distracted sedan boxed you in at an intersection. Maybe a city bus and a private driver both contributed. This article walks through how Arizona law divides fault across multiple defendants, how the math actually works on your recovery, and the deadlines that quietly kill multi-defendant claims. Updated for 2026 Arizona practice. If you want the deeper rule on how fault percentages reduce recovery, see Arizona’s pure comparative negligence rule. This page zooms in on the multi-defendant question.
This article addresses Arizona law. If your crash happened in New Mexico, the tort claims act notice period against government defendants is different (90 days, not 180), and the personal injury statute of limitations is 3 years instead of 2.
Multi-defendant cases show up in more Phoenix crashes than people expect. Common patterns we see:
In a rear-end pileup, the following driver is typically presumed at fault under Arizona pure comparative negligence. That presumption is not absolute. When a lead driver makes an unjustified sudden stop, comparative fault may be assigned to the lead driver too. A rear-end almost always has fault to divide, not fault to hand to one person.
Arizona is a pure comparative negligence state under A.R.S. § 12-2505. That means damages get reduced in proportion to the claimant’s percentage of fault. Even if you are 99% at fault, you can still recover 1% of your damages.
Some states use modified comparative negligence, which bars recovery once a plaintiff crosses 50% or 51% at fault. Arizona has no such bar. The rule here is proportional reduction, not zero-out. In practice, that matters most in cases where the defense expects to push heavy fault onto the plaintiff. In a modified state, that strategy can kill a case entirely. In Arizona, it only shrinks the recovery.
The formula is simple:
Total damages × (100% minus your fault percentage) = your recovery
If your damages come to $100,000 and the jury finds you 30% at fault, your recovery is $70,000. If you are 10% at fault on $500,000 in damages, you recover $450,000.
Fault percentages are assigned by the jury, and under A.R.S. § 12-2506, the jury can assign fault to each named party AND to non-parties. That non-party assignment is the “empty chair,” and it is the single most important concept in multi-defendant Arizona cases.
Here is where Arizona diverges sharply from what most people expect.
Under A.R.S. § 12-2506, Arizona uses several liability, not joint liability. Each defendant pays only their assigned percentage of fault. There is no joint payment where you can collect the full judgment from whichever defendant has the deepest pockets.
Example: three defendants, jury finds them 50%, 30%, and 20% at fault on $200,000 in damages.
If Defendant B is uninsured and broke, you cannot collect their $60,000 share from A or C. That $60,000 is a hole in your recovery unless another source of coverage fills it. This is why identifying every possible defendant AND every possible insurance policy matters so much in a multi-defendant case. It is not enough to prove fault. You have to prove fault against parties who can actually pay.
In a joint-and-several liability state, a plaintiff can collect the full judgment from any single defendant, regardless of that defendant’s assigned fault share. The defendants then fight among themselves for contribution. A plaintiff with a $1 million judgment can pursue the deepest-pocket defendant for the full amount, and the risk of an insolvent co-defendant sits with the other defendants, not the plaintiff.
Arizona pushes that risk the other way. Under A.R.S. § 12-2506, each defendant is liable only for their own fault share, and the risk of an uncollectible defendant sits with the plaintiff. If one defendant is bankrupt, uninsured, immune, or an empty chair, their percentage of fault is a hole in the recovery.
The practical consequence: in Arizona, pre-suit investigation is not optional. Filing against a lineup of defendants without confirming their coverage means you can win the liability fight and still walk away with a partial recovery. A 40% share against a broke driver is worth nothing unless you can route that share through UM/UIM or another insurance layer.
The empty chair defense is the defense playbook in every Arizona multi-defendant case.
Under A.R.S. § 12-2506, the defense can name a non-party at fault, someone you did not sue and cannot sue (they might be immune, unknown, out of state, or already settled). The jury then assigns fault to that empty chair. Any fault sitting in the empty chair is fault you cannot collect on.
Real example: you sue two drivers after a three-car crash. The defense names a fourth driver, one you never identified, as a non-party at fault. The jury assigns 40% to the empty chair, 30% to Defendant 1, 30% to Defendant 2. That 40% is gone. It does not shift to the other defendants. It does not shift to you as plaintiff fault. It just disappears from your recovery.
Combine that with plaintiff fault, and things get tight fast. If you are also assigned 20% for, say, being over the speed limit at the time of impact, only 40% of the damages remains collectible, split between the two named defendants. The math on the empty chair is the single most common reason multi-defendant settlements come in lower than plaintiffs expect.
Facts: You are stopped at a light on Bell Road. A commercial truck rear-ends the sedan behind you, pushing that sedan into you. The sedan driver had been texting and stopped short two seconds earlier. A city street sweeper had left debris in the intersection that contributed to the sedan’s late braking.
Damages: $300,000 (medical bills, lost wages, pain and suffering).
Jury findings:
Your recovery math:
If any of those defendants cannot pay, that share is at risk. This is why the pre-suit investigation matters. You need to know before filing which defendants have collectible insurance and which will need alternative sources of recovery.
This is where UM/UIM coverage becomes critical.
Under A.R.S. § 20-259.01, Arizona insurers must offer uninsured motorist (UM) and underinsured motorist (UIM) coverage on every auto policy. Consumers can reject the offer in writing, but the offer is required. Many drivers carry UM/UIM without realizing it. When one at-fault driver in a multi-defendant case is uninsured or has minimum coverage that runs out fast, your own UM/UIM policy can fill the gap for that defendant’s share of your damages.
Practical example from the case above: if the sedan driver has no insurance, their $75,000 share is uncollectible from them personally. But if you carry $100,000 in UM/UIM, your own carrier steps in to pay up to that policy limit for the uninsured driver’s share.
One important correction on a common misconception: Arizona does not allow stacking of UM/UIM coverage across multiple policies on the same insured. Under A.R.S. § 20-259.01(H), if you have two vehicles on one policy or two policies on the same person, you cannot combine those limits into a single higher pool. What Arizona does allow: coverage under a resident-relative’s separate policy in the same household may still be available to you as an insured under that policy. That is not stacking, it is separate policy coverage, and it can materially change what is available in a multi-defendant case.
For a deeper walkthrough of that scenario, see what happens when the at-fault driver has no insurance. In multi-defendant cases, we look at UM/UIM on the client’s policy and on any resident relative’s policy in the household.
This is the trap that quietly ruins multi-defendant claims.
Under A.R.S. § 12-821.01, before you can sue a public entity or public employee in Arizona, you have to serve a notice of claim within 180 days of the incident. That is 180 days, not two years. Miss it, and your claim against the government defendant dies, no matter how strong the underlying facts are. After the notice, A.R.S. § 12-821 gives you one year to file suit.
The government defendant could be:
If ADOT was one of five at-fault parties and you file at month seven, ADOT is out. Their share of fault (assigned by the jury) becomes empty-chair fault. You cannot collect it from the private defendants. It disappears.
We flag any potential government involvement in the first client meeting. The 180-day window closes fast, and the notice has specific format and content requirements. It is not a document to draft late.
In a multi-defendant case, each insurance carrier has one job: reduce their insured’s share of fault. That means:
Adjusters frequently inflate the plaintiff’s fault percentage to reduce their settlement exposure. In multi-defendant cases that pressure multiplies, because every 5% they can shift off their insured directly reduces their payout.
If you settle with one defendant early, the remaining defendants can, and will, point at the settled defendant as a bigger share of fault at trial. Timing and sequencing of settlements matters. This is not a case type to handle without counsel who has done it before.
Three things we do that a volume-driven intake process usually skips.
1. Full defendant mapping before we file. We identify every possible at-fault party (private drivers, employers, contractors, government entities, dram shops, product manufacturers). We identify every applicable insurance policy on each. We identify UM/UIM available to the client, including under resident-relative policies in the household. That map is the roadmap for the case, and it is the piece that most often determines whether a recovery covers the client’s actual losses.
2. Preserve evidence in the first 72 hours. In multi-defendant cases, the evidence that pins fault percentages on each party has short retention windows, and 2026 has made this tighter, not looser. FMCSA-related data practices at many carriers keep electronic logging device (ELD) records only as long as required, and dashcam footage on commercial fleets frequently overwrites in as little as 7 to 14 days without a preservation hold. Read more on how fault gets proven in Arizona cases.
3. Sequence the settlements. We do not settle with one defendant while others are still exposed to bigger findings. We manage the order to protect the total recovery.
The 180-day rule is the one that catches people. If you suspect a city, county, state, or transit entity is involved even peripherally, get the notice served.
Yes. Arizona lets you name multiple defendants in one lawsuit. Each defendant will have their own attorney and insurance carrier, and the jury will assign a fault percentage to each. Naming everyone together is usually the right move, because it forces the fault allocation into one proceeding instead of leaving pieces unresolved.
Under respondeat superior, an employer is liable for an employee’s negligence committed in the scope of employment. That means the employer’s commercial insurance is likely available in addition to (or instead of) the driver’s personal policy. Interstate commercial trucks carry a federal minimum of $750,000 in liability coverage, and most large carriers carry $1 million or more, which is why identifying the employment relationship early matters.
You can still recover under Arizona’s pure comparative negligence rule. Your recovery is reduced by your fault percentage, but never zeroed out. Being 40% at fault on $200,000 in damages still leaves $120,000 on the table (assuming defendants can pay their shares). Do not assume some fault on your part ends the case. It reduces the case; it does not kill it.
Their fault share is at risk. Your UM/UIM coverage can fill the gap up to your policy limits. Coverage under a resident relative’s separate policy in the same household may also be available. Arizona does not allow stacking limits across policies on the same insured under A.R.S. § 20-259.01(H), but separate resident-relative policies are a different question and often overlooked.
Sometimes, yes, and it matters. If two defendants are both insured by the same carrier (say, both were driving vehicles insured under the same major carrier), the same adjuster and often the same defense counsel may be handling both. That creates conflict-of-interest questions the carrier has to navigate, and it also means the total pool of coverage may be smaller than it looks on paper if the two policies share aggregate limits under a household or fleet arrangement. The first move is confirming whether the policies are truly independent or share limits.
That happens more often than you would think, especially in commercial cases where a trucking company and a subcontractor allocate blame between themselves through indemnity agreements. Those private allocations are not binding on you as an injured plaintiff. Under A.R.S. § 12-2506, the jury still allocates fault based on the evidence, not based on what the defendants agreed to among themselves. That said, a release signed by one defendant in favor of another can affect available coverage, so getting hold of any inter-defendant settlement paperwork early is important.
It drives adjusters to lowball. Each defendant’s carrier knows that at trial, they can point to non-parties (unknown drivers, immune parties, out-of-state actors) and try to shift fault into the empty chair. In pre-trial negotiations, adjusters use the empty chair as leverage to argue their insured’s share is smaller than the plaintiff claims. Countering that requires liability evidence tight enough that the empty chair argument does not survive contact with the facts. That is where reconstruction, ECM data, and camera footage do the heavy lifting.
Longer than single-defendant cases, usually. More parties means more discovery, more depositions, more motions. As of 2026, Maricopa County civil dockets remain backed up in the wake of pandemic-era delays, so a multi-defendant case commonly runs 18 to 30 months from filing to resolution, sometimes longer if a government entity is involved. Settlement can come earlier if liability facts are clean and coverage is confirmed early.
Police reports are a starting point, not the final word. Officers assign fault based on a scene investigation that is often incomplete. In multi-vehicle crashes, real fault allocation comes from black box data, phone records, witness statements, and accident reconstruction, not just the report. We have handled cases where the report blamed one driver and the reconstruction showed three.
If your Phoenix crash involved more than one at-fault party, the math on your recovery is more complicated than a standard two-car case, and the deadlines are shorter than you think. Jared J. Pehrson handles these cases personally.
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By Jared J. Pehrson | Impact Legal Car Accident Attorneys
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