Comparative Fault in Chicago Car Accident Claims

If you were partially responsible for a car accident, you may still be able to recover compensation. Illinois follows a modified comparative fault rule, which allows injured victims to pursue damages as long as they are not more than 50% at fault for the crash. However, the amount you recover may be reduced based on your percentage of responsibility. 

At Conboy Law, we help injured drivers challenge unfair fault allegations and fight for the compensation they deserve. Whether the insurance company claims you were speeding, distracted, or otherwise contributed to the accident, our attorneys work to protect your rights and maximize your recovery.

What Is Comparative Fault?

Comparative fault, also called comparative negligence, is a legal rule that applies when more than one person contributes to an accident. Instead of placing all responsibility on one party, fault is divided among everyone whose actions helped cause the crash.

Under 735 ILCS 5/2-1116, Illinois follows a modified comparative fault system. This means:

• You may recover compensation if you are 50% or less at fault.
• Your compensation is reduced by your percentage of fault.
• If you are more than 50% at fault, you generally cannot recover damages. 

This rule applies to most negligence-based car accident claims throughout Illinois.

How Does Illinois' Modified Comparative Fault Rule Work?

The easiest way to understand comparative fault is through examples.

For example, if your damages total $200,000 and you are found 20% at fault, your recovery would generally be reduced by 20%, allowing you to recover $160,000. If you were 55% at fault, you would generally be unable to recover damages.

How Illinois Comparative Fault Works in a Chicago Car Accident Claim

Illinois uses a modified comparative negligence system. Fault is not treated as all or nothing, because most collisions have more than one cause. Instead, the judge or jury assigns each party a percentage of responsibility and adjusts the damages accordingly.

The 51% Bar Under 735 ILCS 5/2-1116

The controlling statute is 735 ILCS 5/2-1116, the Limitation on Recovery in Tort Actions section of the Code of Civil Procedure. It bars an injured person from recovering damages when the trier of fact finds their contributory fault was more than 50% of the proximate cause of the injury.

At 50% or below, the statute takes a different path. Recovery is allowed, but the damages are diminished in proportion to the fault attributable to the injured person.

Two percentage points decide everything here. At exactly 50% fault, half your damages remain available. At 51%, nothing does. Attorneys refer to this cutoff as the 51% bar rule.

Our Chicago car accident attorneys at Conboy Law document what happened before an insurance company writes the story for you. Call 312-726-9000 for a free case evaluation.

How Your Fault Percentage Reduces Your Damages

The arithmetic is straightforward once the percentage is set. Consider a Chicago collision with $300,000 in proven damages:

1. At 0% fault, no reduction applies and the full $300,000 remains available.
2. At 20% fault, the recoverable amount falls to $240,000.
3. At 50% fault, the recoverable amount falls to $150,000.
4. At 51% fault, recovery is barred and the amount falls to zero.

These figures illustrate the calculation only. Every case turns on its own evidence, injuries, and available insurance coverage.

Illinois Is a Fault State, Not a No-Fault State

Some states require injured drivers to turn first to their own personal injury protection coverage. Illinois does not work that way. Here, the party responsible for causing the crash is responsible for the resulting losses, which makes the fault percentage the central issue in almost every claim.

That structure has a practical consequence. Because the money follows the fault finding, both sides spend far more energy arguing over percentages than over the size of the medical bills.

Illinois Laws That Shape Fault in Chicago Crash Claims

Comparative fault does not operate alone. Several other Illinois statutes affect how blame is assigned, how much a shared-fault claim is worth, and how long you have to act.

Contributory Fault and Proximate Cause

The statute measures your conduct against proximate cause, not against general carelessness. A careless act that did not actually help cause the collision should not raise your percentage.

That distinction matters more than most people expect. An expired registration, for example, is a violation; however, it rarely contributes to how a crash happened.

When Several Drivers Share the Blame

Chicago crashes often involve more than two vehicles. Under 735 ILCS 5/2-1117, every defendant found liable is jointly and severally liable for past and future medical and medically related expenses.

For other damages, the statute draws a line at 25%. A defendant whose fault is 25% or greater is jointly and severally liable for those damages, while a defendant below 25% is severally liable only.

Your own percentage feeds into that calculation. Because the total fault includes the injured person, a rising percentage against you can also shrink what each defendant owes.

Seat Belt Non-Use Cannot Be Used to Cut Your Recovery

Illinois requires seat belt use, and insurers sometimes imply that going without one weakens a claim. The statute says otherwise. Under 625 ILCS 5/12-603.1, failure to wear a seat safety belt shall not be considered evidence of negligence, shall not limit the liability of an insurer, and shall not diminish any recovery for damages.

Adjusters still raise the subject informally. Knowing what the statute actually says is what keeps that argument out of your fault percentage.

Traffic Violations Insurers Use to Shift Blame

Rules of the road violations are the raw material of most comparative fault arguments. Insurers look for any Illinois Vehicle Code section that might attach to your conduct, including:

• following another vehicle more closely than is reasonable and prudent, under 625 ILCS 5/11-710
• driving at a speed greater than is reasonable and proper for conditions, under 625 ILCS 5/11-601
• failing to yield to oncoming traffic when turning left, under 625 ILCS 5/11-902
• failing to stop and yield to a pedestrian lawfully in a crosswalk, under 625 ILCS 5/11-1002

A citation is not a fault finding, and the absence of one is not a defense. Each of these sections turns on what was reasonable in the moment, which is exactly the kind of question evidence can answer.

Filing Deadlines That Change Depending on Who Hit You

The statute of limitations shifts based on the defendant, and Chicago collisions frequently involve government vehicles. Missing the applicable deadline ends the claim regardless of how the fault percentages would have landed.

1. Most Illinois car accident claims must be commenced within 2 years of the injury under 735 ILCS 5/13-202.
2. Claims against the City of Chicago or another local public entity generally carry a 1-year limit under 745 ILCS 10/8-101.
3. Claims involving the Chicago Transit Authority fall under a separate 1-year limit in 70 ILCS 3605/41.

How Insurance Companies Build a Comparative Fault Argument Against You

Comparative fault can significantly reduce an insurer’s potential exposure because damages are reduced according to the plaintiff’s assigned percentage of fault. On a $400,000 claim, moving 10% of the blame onto you reduces the exposure by $40,000. Pushing past 50% eliminates it.

Recorded Statements and Roadside Apologies

Adjusters often call within days, while injured people are medicated, exhausted, and still processing what happened. A recorded statement taken in that condition becomes a transcript that gets parsed months later for admissions.

Politeness works against you here. Saying you are sorry at the scene is a human reflex, but it can appear in the claim file as an acceptance of blame.

Common blame-shifting arguments include:

• guessing at speeds or distances you did not actually measure
• speculating about why you did not see the other vehicle sooner
• social media posts that appear to contradict your reported limitations
• gaps in medical treatment that suggest the injuries came from something else

The Adjuster's Percentage Is Not a Legal Finding

An insurer's number reflects that company's position, not a determination of law. The Illinois Department of Insurance explains that when a settlement cannot be reached, the courts make the final determination of comparative negligence.

The same agency also explains that when filing a claim with another driver's insurance company, that insurer may offer to pay only the portion of your damages matching its insured's share of the blame. Reviewing a proposed percentage before accepting it is far easier than unwinding it afterward.

Chicago Crash Types Where Fault Gets Disputed

Certain collisions generate the same arguments again and again across Cook County claims.

Rear-End Collisions

The trailing driver usually carries most of the blame, yet insurers look for exceptions. Expect arguments about a sudden stop, a burned-out brake light, or an abrupt lane change moments before impact. Even in a straightforward rear-end crash, some percentage is often proposed against the driver in front.

Left-Turn and Intersection Crashes

Left-turn collisions invite finger-pointing in both directions. The turning driver generally must yield; however, that driver's insurer typically argues the oncoming vehicle was speeding or entered on a stale yellow. Speed and signal-timing evidence frequently decides these cases.

Lane-Change and Sideswipe Crashes

Sideswipes on multi-lane Chicago arterials and expressways often come down to which vehicle left its lane. With damage on both sides and no clear right of way, insurers regularly propose a split. Independent witnesses and vehicle damage patterns carry real weight here.

Pedestrian and Bicycle Collisions

Injured pedestrians and cyclists face aggressive blame-shifting: crossing outside a crosswalk, entering against a signal, dark clothing, or phone use. Because these injuries tend to be severe, the incentive to push fault past 50% is significant, and these arguments need evidence rather than indignation.

Multi-Vehicle Pileups

Chain-reaction crashes produce competing accounts from every driver involved. Each insurer has a reason to point at someone else, and the 25% joint liability threshold makes each percentage worth fighting over. Reconstruction analysis often becomes necessary in these claims.

Evidence That Lowers Your Fault Percentage

Fault percentages are built from proof, and the material degrades quickly. Traffic and business camera footage in Chicago is frequently overwritten within days.

Evidence that consistently pushes back against blame-shifting includes:

1. Scene photographs, dashcam video, and images of final vehicle positions
2. Footage from traffic, transit, doorbell, and business security cameras
3. Statements from independent witnesses with no stake in the outcome
4. The Illinois Traffic Crash Report and any citations issued
5. Event data recorder downloads showing speed, braking, and steering before impact
6. Accident reconstruction analysis of skid marks, crush damage, and impact angles
7. Prompt, consistent medical records that align with your account of the crash

What to Avoid After a Chicago Crash

• giving a recorded statement to the other driver's insurer before speaking with an attorney
• estimating speeds, distances, or times when you are not certain
• accepting a proposed fault percentage in writing
• posting about the collision, your activities, or your recovery online
• delaying medical treatment or skipping follow-up appointments

How Our Chicago Car Accident Attorneys Handle Disputed Fault

Our team treats liability as the first battleground, not an afterthought. Preservation letters go out early so that camera footage and vehicle data are not lost while the claim develops.

From there, our attorneys request the crash report, canvass for witnesses, and gather the records that establish where each driver actually was. Where the physical evidence is contested, we work with reconstruction professionals who can explain the mechanics of the collision to an adjuster or a jury.

Communication with the insurance company runs through our office. That arrangement removes the pressure to speculate on the phone and keeps the fault discussion anchored to documented facts.

Every crash is different, and no attorney can promise a particular percentage or result. What we can do is make sure the evidence supporting your account is collected, preserved, and presented.

Frequently Asked Questions About Comparative Fault in Chicago Car Accident Claims

Contact Conboy Law About Your Chicago Car Accident Claim

If an adjuster is hinting that the crash was partly your fault, treat it seriously, because Illinois comparative negligence turns that hint into money. A percentage accepted casually today is difficult to move later.

Conboy Law handles Chicago car accident claims on a contingency fee basis. Our founder, Joseph M. Conboy, has been recognized as a Super Lawyers Rising Star from 2019 to 2022 and is a member of the American Association for Justice and the Illinois Trial Lawyers Association.

Call 312-726-9000 to schedule a free case evaluation with our Chicago car accident attorneys before you give a statement or accept a fault percentage.