Illinois Car Accident Laws: Fault, Insurance, and Your Claim

Illinois is an at-fault (tort) state that follows modified comparative negligence with a 51% bar, so the at-fault driver's liability insurer pays your damages, and you can recover as long as you are not more than 50% responsible for the crash.

Is Illinois a no-fault or at-fault state?

Illinois is a pure at-fault (tort) state. It is not one of the twelve traditional no-fault jurisdictions and has no Personal Injury Protection (PIP) mandate, no choice-no-fault election, and no verbal or monetary threshold that an injured person must clear before pursuing pain-and-suffering damages. When a crash occurs, the injured party looks to the at-fault driver's bodily-injury liability coverage for medical bills, lost wages, and pain and suffering. If the at-fault driver is uninsured or carries too little coverage, the injured party turns to their own UM or UIM coverage. Because Illinois imposes no no-fault threshold, any injured person may file a negligence claim for the full range of compensatory damages from the very first dollar of loss. The fault-based framework is grounded in Illinois's financial-responsibility law (625 ILCS 5/7-203) and mandatory-insurance statute (625 ILCS 5/7-601).

How fault is shared: Illinois's negligence rule

Illinois follows modified comparative negligence with a 51% bar, codified at 735 ILCS 5/2-1116. Under this rule, a jury assigns a percentage of fault to each party. If you are 50% or less responsible for the crash, you may still recover damages, but your award is reduced by your exact fault percentage. For example, if a jury finds you 30% at fault and awards $100,000 in total damages, you collect $70,000. If you are found to be 51% or more at fault, however, your recovery is entirely barred. This is a critical difference from pure comparative negligence states, which allow recovery regardless of fault percentage, and from pure contributory negligence states (Alabama, Maryland, North Carolina, Virginia, and DC), where even 1% of fault bars all recovery. In Illinois, the 51% threshold means most partially-at-fault plaintiffs can still recover, but cases that approach the 50/50 line can be vigorously contested by defense insurers.

Minimum car insurance in Illinois

Every owner of a registered motor vehicle in Illinois must carry liability insurance meeting the 25/50/20 minimums set by 625 ILCS 5/7-203 and enforced by 625 ILCS 5/7-601: $25,000 bodily injury per person, $50,000 bodily injury per accident, and $20,000 property damage per accident. The current $20,000 property-damage figure has been in effect since the 2015 increase from $15,000.

Uninsured motorist bodily-injury (UM) coverage is mandatory under 215 ILCS 5/143a. Every auto liability policy that includes bodily-injury liability must carry UM coverage at least equal to the financial-responsibility limits ($25,000 per person / $50,000 per accident), and an insured cannot waive UM coverage at the statutory floor. Underinsured motorist (UIM) coverage is required under 215 ILCS 5/143a-2 whenever you purchase UM limits above the statutory minimum; UIM must equal your chosen UM limits, and you may waive UIM only above the mandatory floor in writing. Uninsured motorist property damage (UMPD) is also addressed by statute, subject to an actual cash value cap or $15,000 cap with a $250 deductible.

Illinois does not require Personal Injury Protection. Optional Medical Payments (MedPay) coverage is available from most carriers as a supplement but is not mandated by law.

How long you have to file: the statute of limitations

Illinois gives injured accident victims two years from the date of the crash to file a personal-injury lawsuit under 735 ILCS 5/13-202. This deadline applies to bodily-injury negligence claims arising from auto accidents, regardless of the severity of the injury. If you miss the two-year window, the court will almost certainly dismiss your case and the at-fault driver's insurer has no legal obligation to pay.

Property-damage claims for vehicle repair or total-loss value operate under a longer five-year limitation period (735 ILCS 5/13-205). This means you could still pursue property damage after the personal-injury window has closed, though in practice both claims are typically resolved together. If the at-fault vehicle was operated by an employee of a state or local government entity (a city bus, a county snowplow, etc.), the Government Liability Act requires you to file suit within one year, not two (745 ILCS 10/8-101). This compressed deadline catches many victims off guard, so if any government vehicle was involved, consult an attorney promptly.

For Illinois statute-of-limitations rules across all civil claims, see the Illinois statute of limitations page.

What an Illinois car accident claim is worth

An Illinois car accident claim's value depends on two categories of damages. Economic damages cover quantifiable losses: medical expenses (emergency care, hospitalization, surgery, physical therapy, future medical costs), lost wages, reduced earning capacity, and property damage. Non-economic damages cover pain and suffering, emotional distress, loss of enjoyment of life, and scarring or disfigurement. Illinois imposes no statutory cap on compensatory damages in automobile negligence cases, so both categories are theoretically recoverable in full.

The modified-comparative-negligence rule directly affects your final award. If you were 20% at fault, you collect 80% of the jury's total damages figure. Defense insurers will often argue your fault percentage upward to reduce their exposure, making it important to preserve evidence and document the scene thoroughly.

Practical recovery is also limited by insurance minimums. Illinois's $25,000-per-person bodily-injury floor is often insufficient for serious injuries, and the at-fault driver may carry only minimum coverage. Your own UIM coverage becomes critical in those situations. Use the Illinois car accident settlement calculator to estimate the range your specific facts might support, keeping in mind that only a licensed attorney can advise you on actual settlement value.

What to do after a car accident in Illinois

Stay safe and call for help. If anyone is injured, call 911 immediately. Move vehicles out of traffic only if it is safe to do so and the vehicles are driveable. Illinois law (625 ILCS 5/11-403) requires you to remain at the scene of any accident involving injury, death, or property damage.

File a police report. Illinois requires drivers to report accidents that result in injury, death, or property damage of $1,500 or more when a police officer is not present. A police report creates an official record of the crash and is often essential evidence in an insurance claim or lawsuit.

Document everything. Photograph the scene, vehicle damage, skid marks, road conditions, traffic signals, and visible injuries before vehicles are moved. Collect insurance information, driver's license numbers, and contact information from all parties. Note names and contact details of any witnesses.

Seek medical attention promptly. Even if you feel fine, adrenaline can mask serious injuries. A documented medical evaluation within 24-48 hours of the crash establishes a causal link between the accident and your injuries, which defense insurers otherwise contest aggressively.

Do not give a recorded statement to the at-fault driver's insurer. Illinois is a represented-plaintiff state for serious claims. The opposing insurer's adjuster is not on your side. Do not accept a quick settlement offer until you know the full extent of your injuries and have consulted an attorney.

Consult a personal-injury attorney. Many Illinois car accident attorneys handle cases on contingency (no fee unless you recover). An attorney can investigate the crash, preserve evidence, deal with the insurer, and file suit before the two-year statute of limitations expires.

---

For related Illinois crash topics, see the Illinois hit-and-run laws page and the car accident laws hub.

---

This article is general legal information, not legal advice. Car accident law varies by state and changes, and settlement values depend on the specific facts. For advice about a specific crash, consult a licensed attorney in Illinois.

More Illinois Laws

• Illinois AI Meeting Recording Laws
• Illinois Alimony Laws
• Illinois At-Will Employment Laws
• Illinois Car Seat Laws
• Illinois Child Support Laws
• Illinois Common Law Marriage Laws
• Illinois Data Privacy Laws
• Illinois Dog Bite Laws
• Illinois Emancipation Laws
• Illinois Expungement Laws
• Illinois Hit and Run Laws
• Illinois Lemon Laws
• Illinois Power of Attorney Laws
• Illinois Recording Laws
• Illinois Self-Defense Laws
• Illinois Sexting Laws

Sources

• 625 ILCS 5/7-601: Mandatory Motor Vehicle Insurance (ilga.gov)
• 625 ILCS 5/7-203: Financial Responsibility Limits
• 215 ILCS 5/143a: Uninsured Motorist Coverage
• 215 ILCS 5/143a-2: Underinsured Motorist Coverage
• 735 ILCS 5/2-1116: Modified Comparative Negligence
• 735 ILCS 5/13-202: Personal Injury Statute of Limitations (2 years)
• 735 ILCS 5/13-205: Property Damage Statute of Limitations (5 years)
• 745 ILCS 10/8-101: Government Entity Claims (1 year)