Filing an Injury Claim in Illinois: Why Who Hurt You Can Cut Your Deadline in Half

Most people who look up Illinois injury deadlines find the two-year rule and stop reading. That is the right answer only if the person who hurt you was a private driver, business, or property owner. If a city bus, a county road crew, a park district, or the State of Illinois is on the other side of your claim, the clock generally runs twice as fast — and in one situation, your case does not even belong in the regular court system.

The general rule: two years

Under 735 ILCS 5/13-202, most personal injury lawsuits in Illinois must be filed within two years. The clock generally starts on the date of the injury, not the date you finish treatment, hire a lawyer, or realize how serious things are.

There are exceptions that can move the deadline in either direction — injured minors generally get additional time, and certain claims involving delayed discovery follow their own rules — but none of them are safe to assume. The two-year mark is the working number, and your actual deadline is something to confirm with a licensed Illinois attorney based on your specific facts. If your injury happened in a different state, the deadline may be very different; our state-by-state guide to injury filing deadlines shows how widely these rules vary.

The one-year rule for local governments

Here is the trap. Under the Local Governmental and Governmental Employees Tort Immunity Act, 745 ILCS 10/8-101, most injury claims against a local public entity or its employees must be filed within one year — half the general deadline. That covers a lot of everyday defendants: cities, counties, school districts, park districts, transit agencies, and the people who work for them.

Practically, that means the deadline for the same injury can differ dramatically depending on who caused it. Get rear-ended by a private driver, and you generally have two years. Get hit by a municipal vehicle, trip over a hazard on park district property, or get hurt at a public school event, and the window is generally one year. A separate rule generally applies to claims arising out of patient care at public medical facilities, which is one more reason not to guess at your own deadline.

Courts enforce this strictly. Filing a strong case a month late against a local government is generally still a dismissed case.

Suing the State means a different court entirely

Illinois adds a second quirk most people have never heard of. Claims against the State of Illinois itself — say, involving a state agency or a state employee acting within their job — generally cannot be brought in the regular circuit courts at all. They go to a specialized forum called the Illinois Court of Claims under the Court of Claims Act, 705 ILCS 505.

The procedures there are different, and the timing is unforgiving: for personal injury claims, Illinois law generally requires either a formal notice within one year of the injury or the filing of the claim itself within that year. Miss both, and the claim is generally barred no matter how clear the State’s fault may have been.

Fault: the 51 percent line

Illinois follows modified comparative negligence under 735 ILCS 5/2-1116. You can still recover compensation if you were partly at fault, as long as your share of the blame is 50 percent or less. Your recovery is reduced in proportion to your percentage of fault. Cross the line — more than 50 percent responsible — and recovery is barred entirely.

That hard cutoff makes the fault percentage the most contested number in many Illinois cases. Insurance adjusters know exactly where the line sits, and an early phone call assigning you a generous share of the blame is a negotiating position, not a ruling. The percentage ultimately turns on evidence — the police report, photos, witnesses, vehicle damage, camera footage — not on what anyone asserts in the first week.

Auto claims: Illinois is an at-fault state

Illinois is a traditional at-fault (tort) state for car accidents. There is no no-fault system, no personal injury protection requirement, and no injury threshold you must clear before pursuing the at-fault driver. If another driver caused the crash, the claim generally runs against that driver and their liability insurance from the start.

Two practical notes follow from that. First, evidence of fault is central from day one, which is why what you document at the scene and in the first weeks carries so much weight. Second, Illinois requires drivers to carry both liability coverage and uninsured motorist coverage, but the required minimums are modest relative to what a serious injury can involve — so identifying every available policy, including your own underinsured motorist coverage, is often a meaningful part of the claim.

No caps on damages — and the Illinois Supreme Court keeps it that way

Unlike many states, Illinois has no cap on compensatory damages in personal injury cases — including medical malpractice. That is not for lack of trying. The legislature enacted caps twice, and the Illinois Supreme Court struck them down both times: in Best v. Taylor Machine Works (1997) and again in Lebron v. Gottlieb Memorial Hospital (2010), where the court held that capping noneconomic damages violated the separation of powers under the state constitution.

The practical upshot: what an Illinois claim is worth is driven by the evidence — the severity of the injury, the medical picture, the effect on your work and life — rather than by a statutory ceiling. If you are wondering how that evaluation actually works, we walk through the factors in how injury claims get valued.

A recent change: delay now has a price tag

Since July 1, 2021, Illinois has allowed prejudgment interest in personal injury and wrongful death cases. Public Act 102-0006, which amended 735 ILCS 5/2-1303, generally provides for interest at 6 percent per year on damages, accruing once the lawsuit is filed. Illinois appellate courts have so far upheld the statute against constitutional challenges.

Before this change, a defendant could contest a case for years at little cost beyond its own fees. Now the calendar itself works against delay, which many observers believe puts pressure on insurers to evaluate and resolve legitimate claims earlier. As of 2026 the statute remains in effect, though how it applies to any particular case is a question for a licensed Illinois attorney.

What this means if you were hurt in Illinois

• Figure out who the defendant is, early. Government involvement can cut your deadline in half and may change which court hears the case.
• Treat the deadline as closer than it looks. Building a claim — treatment, records, investigation — takes time, and two years passes quickly. One year passes twice as quickly.
• Do not assign yourself a fault percentage. The 51 percent line makes that number too important to concede before anyone has reviewed the evidence.

For the short version of the rules above, see our Illinois quick-reference page.

If you were injured in Illinois and want to know whether you may have a claim, answer a few questions about what happened and we will connect you with a participating law firm that can evaluate it. Free, confidential, and no obligation.