Illinois comparative negligence comes down to one number: your percentage of fault. You can recover damages only if you are 50 percent or less at fault, your recovery is reduced by your exact percentage, and at 51 percent you recover nothing at all. That is the rule of 735 ILCS 5/2-1116, and it is why insurance adjusters from Chicago to Naperville work so hard to pin blame on injured people from the very first phone call.
Comparative negligence is the legal system’s answer to a common reality: accidents often have more than one cause. Instead of an all-or-nothing result, the law assigns each party a percentage of fault and adjusts the money accordingly.
Here’s a concrete example. Imagine you’re rear-ended at a stoplight, but one of your brake lights was out. A jury finds your total damages are $200,000. It also finds the other driver 90% at fault for following too closely and you 10% at fault for the brake light. Under Illinois comparative negligence, your award is reduced by your share: you recover $180,000, not $200,000. If the jury instead put 30% on you, you’d recover $140,000. Your compensation shrinks point by point as your percentage of fault grows.
That much is intuitive. What surprises people is the cliff at the middle of the scale.
Illinois follows what’s called modified comparative fault, and the controlling statute is 735 ILCS 5/2-1116. It provides that the plaintiff is barred from recovering damages if the trier of fact finds that the plaintiff’s contributory fault is more than 50% of the proximate cause of the injury or damage for which recovery is sought. If your fault is 50% or less, you aren’t barred; instead, your damages are diminished in proportion to your percentage of fault.
Read that carefully, because the precise line matters. At exactly 50% fault, you can still recover half of your damages. At 51%, you recover nothing. The statute draws a hard line at “more than 50%,” which is why lawyers often call it the 51% bar. There is no partial recovery on the wrong side of that line, no matter how badly you were hurt or how clearly the other party also caused the crash.
This structure shapes every settlement negotiation in the state. Both sides know that fault percentages aren’t decided until a jury says so, which means every negotiation is partly a prediction about how a jury would split the blame. The insurance company’s job is to push that prediction as high against you as possible.
Adjusters are trained to develop comparative fault evidence from the first phone call. A friendly question like “why do you think you didn’t see the other car sooner?” is an invitation to speculate against yourself. A recorded statement taken while you’re medicated or shaken becomes a transcript that gets parsed for admissions months later. Even an apology at the scene, the kind of thing polite people say reflexively, can show up in the file as evidence you accepted blame.
The math explains the motive. On a $400,000 claim, every 10% of fault shifted onto you saves the insurer $40,000. Pushing you from 20% to just over 50% doesn’t just trim the claim; it eliminates it. That’s why fault arguments appear even in crashes that seem one-sided, and why the arguments often sound like this: you were speeding slightly, you could have braked sooner, you were momentarily distracted, your headlights were off, you were in the intersection a beat too early. None of these has to be proven at the negotiation stage. The insurer only needs to create doubt, because doubt discounts settlements.
Our Illinois car accident lawyers see these tactics constantly, and the pattern is predictable: the weaker the insurer’s defense on the main question of fault, the harder they work to manufacture a percentage on you.
Certain crash types generate fault disputes again and again.
The trailing driver is usually blamed, but insurers look for exceptions: a sudden and unnecessary stop, non-working brake lights, or an abrupt lane change just before impact. Even in the classic rear-end case, expect an attempt to assign you a slice of fault.
Left-turn crashes invite finger-pointing in both directions. The turning driver generally must yield, but insurers for the turning driver argue the oncoming car was speeding, ran a stale yellow, or was visible too late to matter. A few miles per hour over the limit can become the centerpiece of a comparative fault argument, so speed reconstruction often decides these cases.
Injured pedestrians face aggressive blame-shifting: crossing outside the crosswalk, entering against the signal, wearing dark clothing at night, looking at a phone. Because pedestrian injuries tend to be severe, the insurer’s incentive to push fault past 50% is enormous, and these arguments must be met with evidence rather than indignation.
Commercial vehicle crashes deserve special mention. Trucking companies deploy rapid-response teams to the scene within hours precisely to build comparative fault defenses before you’ve even left the hospital. If you were hit by a semi, the evidence fight starts immediately, which is one reason Illinois truck accident claims demand early legal involvement.
Fault percentages are built from evidence, and the injured person who gathers it early holds the advantage. The tools that consistently beat blame-shifting include scene photographs and video from traffic and doorbell cameras, which are often overwritten within days. Independent witnesses matter because they have no stake in the outcome. Police reports and citations set a baseline narrative, and event data recorders in modern vehicles capture speed, braking, and steering in the seconds before impact. Accident reconstruction experts can translate skid marks, crush damage, and data into a fault opinion a jury can trust. Even your medical records play a role, because consistent, immediate treatment supports your account of how the crash happened.
Just as important is what you don’t do: don’t give recorded statements without counsel, don’t guess about distances and speeds, and don’t discuss the crash on social media. Silence costs you nothing, while a careless sentence can cost a percentage.
Illinois comparative negligence turns two percentage points into the difference between a substantial recovery and no recovery at all. At 49% fault on a $300,000 case, you collect $153,000. At 51%, you collect zero. No other factor in your case, not the severity of your injuries and not the size of the policy, can survive a fault finding on the wrong side of that line.
Insurers know precisely where the cliff sits, and in serious cases they aim for it. That’s why experienced personal injury lawyers treat every case, from the first day, as a fight over fault percentages as much as a fight over damages. Building the liability case early, preserving the evidence that pins fault where it belongs, and refusing to let an adjuster write the story of your crash are what keep you on the right side of 50%.
A real example from our firm’s practice: after an uninsured motorist hit our client head-on, we won $225,000 at arbitration. State Farm rejected the award and demanded a trial, so we tried the case and won a $325,000 verdict, $100,000 more than the award it rejected. Every case is different, and past results do not guarantee future outcomes.
Under 735 ILCS 5/2-1116, a plaintiff whose contributory fault is more than 50 percent of the proximate cause of the injury is barred from recovering damages. At 50 percent or less, damages are reduced proportionally instead.
Yes, as long as your share of fault is 50 percent or less. For example, damages of $200,000 with 10 percent fault yield a $180,000 recovery.
With evidence: scene photos, video, independent witnesses, event data recorder downloads, and reconstruction experts, plus avoiding recorded statements and speculation that give adjusters material to use against you.
If an insurance company is hinting that your crash was partly your fault, take it seriously, because they certainly do. Collins Law Group knows how Illinois comparative negligence really works at the negotiating table and in the courtroom, and we know how to push back with evidence instead of arguments. We offer free consultations, and we don’t get paid unless we recover for you. Contact Collins Law Group today before you give a statement or accept a fault percentage that doesn’t belong to you.
John D. Risvold is an equity partner at Collins Law Group, P.C. in Naperville, Illinois. He represents individuals and families in catastrophic personal injury and wrongful death cases, focusing on commercial trucking crashes, rideshare and autonomous vehicle litigation, medical malpractice and birth injury, and product defect claims. He has tried cases to verdict in Illinois courts, recovered more than $50 million for clients over thirteen years of practice, and has been named to Best Lawyers in America for Personal Injury Litigation and Illinois Super Lawyers.
This article is for general information only and is not legal advice. Reading it does not create an attorney-client relationship. Every case is different; if you have been injured, speak with a lawyer about your specific situation.
