If you’ve been injured in an accident in Joliet or anywhere in Will County, the percentage of fault assigned to you isn’t just a number on paper. It can determine whether you recover full compensation, reduced compensation, or nothing at all. Illinois uses a modified comparative negligence model with a 51 percent bar. That means the difference between 50% fault and 51% fault isn’t a minor adjustment. It’s the difference between recovering and being shut out.
Understanding how this rule works and how insurance companies try to use it against you is critical to protecting your claim. Contact our Joliet car accident lawyer at 815-258-7877 for a free consultation to discuss how fault may affect your case.
What the statute says and why the threshold matters
Illinois codified its comparative fault framework at 735 ILCS 5/2-1116. The statute provides that a plaintiff shall be barred from recovering damages if the trier of fact finds that the contributory fault on the part of the plaintiff is more than 50% of the proximate cause of the injury or damage for which recovery is sought.
When the plaintiff’s contributory fault is not more than 50%, the plaintiff is not barred from recovering. Still, any damages allowed shall be diminished in proportion to the amount of fault attributable to the plaintiff.
Here’s what that looks like in practice. Say you’re injured in a car accident at a Plainfield intersection and your total damages (medical bills, lost wages, and pain and suffering) amount to $100,000. If the jury assigns you 30% of the fault, your recovery drops to $70,000. At 50% fault, you recover $50,000. But at 51% fault, your recovery is zero. Not reduced. Eliminated entirely.
If you are found to be 50% at fault, you can recover 50% of your damages. If you are found to be 51% at fault, you recover nothing. That one-percentage-point gap is where most comparative fault battles are won or lost.
How insurance adjusters and defense attorneys exploit this rule
Insurance companies don’t just evaluate fault objectively. They argue for a fault percentage that benefits them financially. And in Illinois, the 51% bar gives them a powerful target.
Pushing you past the threshold
If your total damages are $200,000, the insurance company doesn’t need to prove you were entirely at fault. They need only to push your fault allocation to 51%. That single percentage point saves them the full $200,000. This creates a massive financial incentive to inflate your share of responsibility, even by a small amount.
Defense attorneys know this. They’ll scrutinize your speed, your lane position, whether you were on your phone, whether you braked in time, and anything else they can use to build a narrative of contributory fault. In cases near the 50/50 line, expect aggressive arguments designed to tip the balance.
Reducing your recovery even below the bar
Even when they cannot bar your claim entirely, shifting fault from 20% to 40% on a $150,000 case means paying you $90,000 instead of $120,000. Every percentage point they add to your column saves them money. That’s why fault allocation isn’t something you should leave to an insurance adjuster’s discretion.
Evidence that determines fault percentages
Fault isn’t assigned by guesswork. It’s determined by evidence, and the quality of evidence available when the case is evaluated often dictates the outcome.
Police reports are typically the first document reviewed. They contain the responding officer’s observations, statements from drivers and witnesses, and sometimes a preliminary determination of fault. But police reports aren’t conclusive. They’re one piece of the picture.
Witness testimony can shift fault dramatically. An independent witness who saw the other driver run a red light or who confirms that you had the right of way carries significant weight. Conversely, a witness who disputes your account can be used against you.
Accident reconstruction is often decisive in complex cases. Reconstruction professionals analyze skid marks, vehicle damage patterns, road conditions, and physics to determine how the collision occurred. In cases where fault is genuinely contested, reconstruction evidence often determines whether a plaintiff lands above or below the 51% line.
Surveillance and dashcam footage provides objective evidence that can entirely override competing narratives. Traffic cameras at Joliet intersections, business security cameras, and dashcam recordings can establish what actually happened, removing fault arguments from the realm of speculation.
Electronic data from vehicles (event data recorders, or “black boxes”) can reveal speed, braking, and steering inputs in the seconds leading up to impact. In truck accident cases, electronic logging device (ELD) data may also show hours-of-service violations or other contributing factors.
Multi-party accidents and fault apportionment
Multi-vehicle collisions on I-80, Route 59, or other Northern Illinois roadways add another layer of complexity. When three or more parties share fault, Illinois law distributes liability among all tortfeasors, and the rules governing joint and several liability become critical.
Under 735 ILCS 5/2-1117, all defendants found liable are jointly and severally liable for a plaintiff’s past and future medical and medically related expenses. For other damages (lost wages and pain and suffering), the rules split based on a 25% threshold. Any defendant whose fault is less than 25% of the total fault is only severally liable for those other damages. In comparison, any defendant whose fault is 25% or greater is jointly and severally liable for all other damages.
This matters in practice. In a three-car accident where you’re 15% at fault, Defendant A is 60% at fault, and Defendant B is 25% at fault, both defendants are jointly and severally liable for your medical expenses. But if Defendant B’s insurance coverage is insufficient, you can pursue Defendant A for Defendant B’s share of medical costs. The apportionment math varies significantly depending on how fault is distributed, and a thorough investigation can identify additional at-fault parties (vehicle manufacturers, government entities responsible for road conditions, and employers under respondeat superior) to broaden recovery options.
Calling 815-258-7877 to speak with Attorney Lichner early in the process gives you the best opportunity to identify all potentially liable parties before evidence disappears.
Why the investigation phase is where comparative fault cases are won
Because the 51% bar is an all-or-nothing threshold, the investigation and evidence preservation phase of an Illinois injury case isn’t just important. It’s determinative. Evidence degrades fast. Surveillance footage is overwritten. Witnesses relocate or forget details. Vehicle damage is repaired. Skid marks fade. Road conditions change.
Attorney Michael J. Lichner prioritizes building the evidentiary record from the outset. Through LiSi Law, LLC, he retains accident reconstruction professionals, secures surveillance footage by sending preservation letters, obtains police reports and 911 recordings, and documents the scene before critical evidence vanishes. When the opposing side knows a case has been meticulously investigated from the start, fault arguments grounded in speculation lose their force.
Illinois gives injured parties two years from the date of the accident to file a personal injury lawsuit. But waiting months to begin investigating means the evidence you need to stay below that 51% threshold may no longer exist.
Protect your claim with experienced legal representation
Illinois’ 51% comparative fault rule means the difference between a significant recovery and getting nothing can come down to how effectively fault is investigated, documented, and argued. Insurance companies understand this. They start building their arguments for the fault immediately. You should have someone building yours just as fast.
A Top 100 National Trial Lawyer with over a decade of experience, Michael J. Lichner handles personal injury cases throughout Will County, DuPage County, Cook County, and the surrounding Northern Illinois collar counties, including Bolingbrook, Naperville, Romeoville, Lockport, Homer Glen, Mokena, New Lenox, Shorewood, and Frankfort.
Call 815-258-7877 for a free consultation. There’s no fee unless we recover compensation for your injuries.