Car Accident Laws in Illinois: Fault, Insurance & Deadlines

Illinois is an at-fault (tort liability) state, not a no-fault state. There is no mandatory personal injury protection (PIP) coverage, and the driver who caused the crash — through their liability insurance — is responsible for paying the other person's medical bills, lost wages, and pain and suffering. If you were hurt, you generally have two years from the date of the crash to file a personal injury lawsuit in Illinois, and only one year if the at-fault driver was a government employee or you're suing a government entity. Property-damage claims (fixing your car) have a longer, five-year window. Details below — and because insurance minimums and deadlines can change, always confirm current numbers with the Illinois Department of Insurance or the official Illinois Compiled Statutes before you rely on them.

1. Fault system: Illinois is an at-fault state

Illinois uses a traditional at-fault (tort) system for car accidents. Illinois does not require drivers to carry personal injury protection (PIP), and it is not a no-fault state. In practice that means:

• The driver(s) found responsible for causing the crash — or their liability insurer — pays for the other party's injuries and property damage.
• An injured person can file a claim directly with the at-fault driver's insurance company, use their own med-pay/PIP coverage if they purchased it as an optional add-on, or file a lawsuit against the at-fault driver.
• There's no requirement to exhaust your own policy first, and no dollar threshold you must clear before you're allowed to sue for pain and suffering (a feature of true no-fault states that Illinois does not have).

Illinois is also not an "add-on" or "choice" no-fault state — it is a standard tort state, full stop, according to the Illinois Department of Insurance.

2. Minimum auto insurance required in Illinois

Under the Illinois Vehicle Code, every vehicle owner must maintain liability insurance (625 ILCS 5/7-601), and the minimum amounts are set out at 625 ILCS 5/7-203. As of this writing, Illinois's minimum liability limits are commonly summarized as 25/50/20:

• $25,000 bodily injury liability per person
• $50,000 bodily injury liability per accident (total)
• $20,000 property damage liability per accident

Uninsured motorist (UM) coverage is mandatory in Illinois. Under 215 ILCS 5/143a, every auto liability policy must include UM bodily injury coverage at least equal to the state minimum limits.

Underinsured motorist (UIM) coverage is also part of the framework. Under 215 ILCS 5/143a-2, policies issued since 1983 must generally include UIM coverage in an amount equal to the policy's uninsured motorist limits where those limits exceed the state minimum, subject to the insured's written election.

PIP / medical payments (med-pay) coverage is not mandatory in Illinois — it's an optional coverage drivers can add but are not required to carry. Because Illinois is not a no-fault state, PIP is not part of the state's minimum-coverage package.

These numbers can be adjusted by the legislature, so verify the current minimums with the Illinois Department of Insurance or the Illinois Secretary of State's mandatory-insurance guidance before treating them as final, and remember that carrying only the state minimum often leaves an injured person or an at-fault driver underprotected in a serious crash.

3. Statute of limitations after an Illinois crash

• Personal injury: two years from the date of the crash to file a lawsuit, under 735 ILCS 5/13-202.
• Property damage (vehicle repair, other damaged property): five years from the date of the crash, under 735 ILCS 5/13-205.
• Claims against a government entity or employee (a city, county, school district, park district, the Chicago Transit Authority, or the State of Illinois): only one year, under the Local Governmental and Governmental Employees Tort Immunity Act, 745 ILCS 10/8-101. Some municipalities also require separate written notice even sooner, so don't wait to check.

These are civil filing deadlines, not deadlines for reporting a crash or filing an insurance claim (insurers can set their own, shorter contractual reporting requirements). Miss the statute of limitations and a court will almost always dismiss the case regardless of how strong it is, so if a government vehicle, snowplow, transit bus, or public-school vehicle was involved, treat the one-year clock as the one that matters. Confirm the applicable deadline with the Illinois courts or an attorney, since exceptions (such as the discovery rule or the injured person's age) can shift these dates.

4. Shared-fault rule: modified comparative negligence

Illinois follows modified comparative negligence under 735 ILCS 5/2-1116. The statute bars a plaintiff from recovering anything if their own fault is more than 50% of the cause of the crash — commonly described as the "51% bar" rule, since being 50% at fault or less still allows recovery. If you're found 50% or less at fault, your damages are simply reduced by your percentage of fault. For example, someone with $100,000 in damages who is found 30% at fault would recover $70,000. This determination is made by a judge or jury (or negotiated with an insurer), and the Illinois Department of Insurance notes it cannot resolve fault disputes itself — that's a matter for the courts.

5. When you must report a crash in Illinois

Under the Illinois Vehicle Code (625 ILCS 5/11-406 and 5/11-408), a crash generally must be reported to law enforcement whenever it results in:

• Death or bodily injury to any person, or
• Property damage that appears to exceed $1,500 when all involved drivers are insured (this threshold drops to $500 if any involved driver is uninsured).

Responding officers document the crash on the state's official Illinois Traffic Crash Report and forward it to the Illinois Department of Transportation. If police don't respond to the scene and the crash meets these thresholds, contact local law enforcement to make sure a report gets filed — it becomes the paper trail your insurer and any court will rely on. Separately, if you're involved in a reportable crash without adequate insurance, the Illinois Secretary of State's office can suspend your driving privileges, so confirming your coverage status matters as much as the report itself.

6. Damage caps and the shorter deadline for government claims

Illinois does not impose a general statutory cap on compensatory damages (medical bills, lost income, pain and suffering) in an ordinary car-crash lawsuit between private drivers. Some categories of damages in other kinds of Illinois cases have been capped or litigated over the years, so if your case involves anything beyond a standard driver-versus-driver crash, don't assume — confirm with a licensed Illinois attorney.

What is consistently different is timing and process when a government vehicle or entity is involved — a police car, fire truck, transit bus, snowplow, or school vehicle. Those claims:

• Must generally be filed within one year, not two, under the Tort Immunity Act (745 ILCS 10/8-101), or through the Illinois Court of Claims if you're suing the State itself.
• May require a separate written notice of claim to the public entity, sometimes on a tighter local timeline.
• Can involve added immunities or a higher legal standard (such as "willful and wanton" conduct) for certain government conduct, depending on the facts.

Because these rules are technical and unforgiving, treat any crash involving a government vehicle as time-critical from day one.

What to do after a crash in Illinois

1. Check for injuries and call 911 if anyone is hurt, or if the crash may exceed Illinois's reporting thresholds — get police to the scene.
2. Move to safety if the vehicles are drivable and it's safe to do so, but don't leave the scene before exchanging information or before police arrive if they're responding.
3. Exchange information with every other driver: name, address, phone number, driver's license number, license plate, and insurance company and policy number.
4. Get the official crash report number from the responding officer, or the officer's name and badge number, so you can request the crash report later.
5. Document the scene — photos of vehicle damage, license plates, road conditions, traffic signals, and any visible injuries — and get contact information for witnesses.
6. Seek medical evaluation promptly, even if you feel fine; some injuries surface hours or days later, and prompt records tie your injuries to the crash.
7. Notify your own insurer of the crash, even if you weren't at fault — most policies require prompt notice regardless of fault.
8. Confirm whether a government vehicle was involved and, if so, move quickly given the shortened one-year deadline and possible separate notice requirements.
9. Track the clock — two years to sue for injury, five years for property damage, one year if a government entity is involved — and don't wait until close to a deadline to get advice.
10. Talk with a licensed Illinois attorney before signing any settlement release, especially if fault is disputed or injuries are significant, since Illinois's comparative-fault rule means how fault gets allocated can determine whether — and how much — you recover.

This article is general information about Illinois law, not legal advice; consult a licensed Illinois attorney about your specific situation.