Utah's 50% Rule: How Comparative Negligence Affects Your Claim
Utah's modified comparative fault law cuts your recovery by your percentage of fault — and wipes it out entirely at 50% or more.
Fault Is a Pizza. Utah Cuts It by Percentage.
Think of fault like a pizza. Eight slices. If you're responsible for two of them, you own 25% of the fault. The other driver owns 75%. Under Utah Code [§78B-5-818](https://le.utah.gov/xcode/Title78B/Chapter5/78B-5-S818.html), your damages are reduced by your percentage of fault. That 25% comes straight off the top of whatever you're owed.
Here's the hard line: hit 50% fault or more, and you collect nothing. Zero. That's Utah's modified comparative fault rule — also called the 50% bar. It doesn't matter if the other driver ran a red light. If the insurer assigns you half the blame, your claim dies. Insurance companies know this. They use it deliberately to reduce or eliminate payouts.
A real example: You're rear-ended at an intersection but had a cracked brake light. The other driver's insurer claims you're 30% at fault for the crash. Your vehicle damage is $12,000. Under the 50% rule, you'd recover $8,400 — not $12,000. That $3,600 disappears based solely on their fault determination, which you have every right to challenge.
How Insurers Assign Fault — and Why You Should Push Back
Insurers don't use a neutral formula. An adjuster reviews the police report, your recorded statement, and whatever photos they have — then assigns percentages. That assignment directly affects their payout. They have a financial incentive to push your number up. Studies consistently show disputed liability claims settle for significantly less than their actual value when claimants accept the first determination.
The evidence that moves fault percentages: police reports with officer conclusions, witness statements, traffic camera and dashcam footage, intersection diagrams, and physical damage patterns on both vehicles. Skid marks, point of impact, and airbag deployment data all tell a story. If you didn't gather this at the scene, it may still be recoverable — but the window closes fast. Utah's statute of limitations for property damage claims is three years under [§78B-2-305](https://le.utah.gov/xcode/Title78B/Chapter2/78B-2-S305.html), but evidence disappears much sooner.
Insurers are bound by [§31A-26-303](https://le.utah.gov/xcode/Title31A/Chapter26/31A-26-S303.html), Utah's unfair claim settlement practices statute. They must conduct a reasonable investigation before denying or reducing your claim. A fault determination made without reviewing available video evidence or ignoring witness accounts isn't reasonable — it's a violation. That gives you leverage.
What a Partial-Fault Finding Does to Your Vehicle Claim
Comparative fault doesn't just affect injury claims. It cuts into your vehicle damage recovery, your diminished value, your total loss payout, and your rental reimbursement. If you're found 20% at fault and your car's actual cash value is $35,000, the insurer may pay only $28,000. If your diminished value claim is worth $6,000, you might see $4,800. Every dollar of fault costs you real money.
Under [R590-190-11(2)(a)](https://www.law.cornell.edu/regulations/utah/R590-190-11), a third-party total loss must be paid at the cost of a comparable replacement vehicle including taxes, license, and transfer fees. That baseline can already exceed the insurer's offer by $4,000–$8,000 in today's used-car market — before fault reduction even enters the picture. Stack a disputed fault percentage on top of an undervalued ACV, and you could be short by $10,000 or more.
Rental coverage follows the same proportional logic. [R590-190-11(9)(a)](https://www.law.cornell.edu/regulations/utah/R590-190-11) requires substitute transportation while your vehicle is being repaired or replaced. If the insurer has assigned you 30% fault, they may try to cut your rental reimbursement proportionally. Challenge both the fault number and the underlying valuation — they compound each other.
How to Challenge a Fault Determination Before It Costs You
Start with the police report. Officers often assign contributing factors to each driver. That language matters. If the report doesn't support the insurer's fault split, that's your first argument. Request the insurer's complete claim file — under [§31A-26-303](https://le.utah.gov/xcode/Title31A/Chapter26/31A-26-S303.html) they're required to document their investigation. If they can't show their work, push back hard.
Get your own independent appraisal. Our team at Property Damage Pros pulls all major book valuations, actual dealer sales data, auction data, and dealer inventory demand data — not a single tool or estimate. We build a documented valuation that stands up in court. Our average recovery on total loss claims runs $6,500 above the insurer's initial offer. On diminished value, we average $3,000–$8,000. Those numbers exist because we don't accept the first number.
About 50% of our cases go to litigation — handled in-house by our own attorneys, not outsourced. Property Damage Pros is the property damage division of the LawyerUp Injury Group. You get a certified appraisal firm and a law firm in one. If the insurer's fault assignment is wrong, we build the evidence file and take it to court when necessary. The clock runs three years from the date of loss under [§78B-2-305](https://le.utah.gov/xcode/Title78B/Chapter2/78B-2-S305.html). Don't spend that time negotiating alone.
Frequently Asked Questions
If I'm 49% at fault in Utah, do I still get anything?
Yes. At 49% fault you can still recover, but your damages are reduced by 49%. So if your vehicle damage totals $20,000, you'd recover $10,200. At exactly 50% fault — or higher — Utah's modified comparative fault rule bars your recovery entirely under §78B-5-818. That's why disputing the insurer's fault percentage matters so much. Even a 10-point difference can mean thousands of dollars.
Can the insurance company change their fault determination after the fact?
Yes, and they do. Insurers can revise fault percentages as new evidence surfaces — including evidence you submit. That's why gathering your own documentation is critical: dashcam footage, independent witness statements, photos of road conditions, and a professional vehicle appraisal. Under §31A-26-303, they're required to investigate fairly. If you present evidence they ignored, you can force a reassessment. Our attorneys handle exactly this kind of dispute.
How much does it cost to have Property Damage Pros challenge a fault-reduced claim?
We offer two options. A flat fee of $400 for a diminished value appraisal or $350 for a total loss appraisal. Or a contingency arrangement — you pay nothing unless we recover more than the insurer's initial offer, and our fee is a percentage of the amount above that offer. If we don't beat their number, you owe nothing. With an average total loss recovery of $6,500 above initial offers, the contingency option typically more than pays for itself.
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