You felt something give out in your lower back while lifting a pallet, but you finished your shift and went home, assuming it would loosen up over the weekend. Three months later you are in an orthopedic surgeon’s office being told you need surgery, and the first question anyone asks is when you told your employer about the injury.
Illinois workers’ compensation law imposes two separate deadlines on injured workers, and missing either one can end a claim that is otherwise strong. Understanding both, and understanding that they are not the same thing, is one of the most practical steps you can take.
Two Deadlines That Are Frequently Confused
Many injured workers believe that telling a supervisor about an accident is the same as filing a workers’ compensation claim. It is not. The Illinois Workers’ Compensation Act creates two distinct obligations, each with its own clock. The first is to give your employer notice of the accident within 45 days, under Section 6(c). The second is to file an Application for Adjustment of Claim with the Illinois Workers’ Compensation Commission within the limitations period, under Section 6(d).
Satisfying the first does nothing to satisfy the second. An insurance company that voluntarily pays your medical bills and lost wages has not filed anything on your behalf, and it is under no obligation to keep paying. Those payments can affect your deadline, because where compensation has been paid the filing period is measured from the date of the last payment rather than the date of the accident. What they never do is substitute for an application filed with the Commission. The workers most often caught by the deadline are the ones who assumed their claim was open because checks were arriving.
The 45-Day Notice Requirement Under Section 6(c)
Section 6(c) requires that notice of the accident be given to the employer “as soon as practicable, but not later than 45 days after the accident.” The 45 days is an outer limit rather than a target, and delay invites the argument that the injury happened somewhere other than work. The Act does not demand a particular form: notice may be oral or written, and it need state only the approximate date and place of the accident, if known.
The Act also protects workers who give imperfect notice. No defect or inaccuracy in the notice bars a claim unless the employer proves that it was unduly prejudiced by the defect. If you told your foreman the wrong date, or described a shoulder injury as a neck injury, that alone does not sink your case.
What the notice must convey is a work-related accident. Illinois decisions have found notice sufficient where the employer already had the facts of the accident within the 45 days, but an employer’s general awareness that you have a medical problem is not the same thing. Telling a supervisor only that your back hurts, without tying it to something that happened at work, may not be enough.
What the Act does not forgive is silence. Giving no notice at all within 45 days is a bar to the claim.
The Filing Deadline: Three Years, or Two Years From the Last Payment
Under Section 6(d), your Application for Adjustment of Claim must be filed within three years after the date of the accident where no compensation has been paid, or within two years after the date of the last payment of compensation where any has been paid, whichever period is later.
An example shows how this works. A worker injured in January 2023 who never receives benefits must file by the third anniversary of the accident in January 2026. If that worker instead received temporary total disability benefits with the last payment made in September 2025, two years from that payment runs to September 2027, which is later, so September 2027 controls.
Which payments count is where these cases become complicated. Payment of accident-related medical bills by the employer or its workers’ compensation carrier may itself qualify as a payment of compensation that restarts the two-year period, so the analysis is not limited to disability checks. Benefits paid under an ordinary group health plan are treated differently, though Section 8(j) provides that where an employer-funded nonoccupational plan pays benefits that would not have been payable had workers’ compensation rights been recognized, the notice and filing periods do not begin until those payments end.
The statute also measures the two years from the date of the last payment, not the last period it covered. Because these distinctions can decide whether a claim survives, do not assume your deadline has been extended because the insurance company paid something recently. Treat the three-year date from the accident as your deadline unless a workers’ compensation attorney confirms otherwise.
Repetitive Trauma Injuries: When Does the Clock Start?
For a single traumatic event, the date of accident is obvious. For injuries that develop gradually, such as carpal tunnel syndrome, rotator cuff tears, or degenerative back conditions caused by years of heavy work, Illinois uses what is called the manifestation date.
In Peoria County Belwood Nursing Home v. Industrial Comm’n, 115 Ill. 2d 524 (1987), the Illinois Supreme Court held that the date of accident in a repetitive trauma case is the date on which both the fact of the injury and its causal relationship to employment would have become plainly apparent to a reasonable person. The court revisited the standard in Durand v. Industrial Comm’n, 224 Ill. 2d 53 (2006), confirming that a formal diagnosis is not required to start the clock. In practice, the manifestation date is often set at the date the worker first required treatment or could no longer perform the job.
Neither event is an automatic rule. Courts weigh the totality of the circumstances, including symptom severity, treatment sought, and what the worker knew. What makes this critical is that the manifestation date sets both clocks: the 45-day notice period and the filing period each run from it.
That date is often earlier than the injured worker expects. The clock may have started when you first saw your family doctor about numbness in your hands, not when a specialist finally connected the condition to your work. Our discussion of proving that a repetitive strain injury is work-related covers the related proof problems.
Special Deadlines for Certain Claims
Several categories of claims follow different timelines. Where an injury results in death, an application for death benefits may be filed within three years after the date of death where no compensation has been paid, or within two years after the last payment, whichever is later. Where the injury was caused by exposure to radiological materials, equipment, or asbestos, the application must be filed within 25 years after the last day the employee worked in that environment, and a death from such exposure must occur within that same 25-year window.
Where an injured worker or a dependent of a deceased worker is under a legal disability, the limitations periods do not begin to run until a guardian has been appointed. Be careful with that term. Legal disability is a specialized legal status, not a description of how badly you are hurt. Being unable to work, being rated temporarily totally disabled, or drawing Social Security disability does not place you under a legal disability or stop your deadline.
Finally, claims for occupational diseases proceed under the separate Workers’ Occupational Diseases Act, which contains its own notice and filing deadlines. If your condition developed from workplace exposure rather than a specific accident, do not assume the deadlines above apply to you. Asbestos-related conditions in particular may proceed under either Act depending on the circumstances, and the governing deadlines differ.
Protecting Your Claim
The single most useful thing you can do after a work injury is report it immediately and in writing, even if it seems minor and even if you expect to keep working. Injuries that seem trivial in week one routinely become surgical cases by month three, and by then the 45-day window has closed.
Keep your own records as well. Write down the date, what you were doing, who saw it, and who you told, and save the texts and emails. If the insurance company begins paying benefits, note every payment date, because the last one may determine your filing deadline.
Most importantly, do not wait for the insurance company to tell you when your claim must be filed. It has no obligation to do so. The Application for Adjustment of Claim is filed by you or your attorney, and an arbitrator cannot excuse a deadline that has genuinely run. Whether it actually ran is a separate question that can turn on which payments were made, whether a tolling provision applies, and sometimes whether the employer lulled you into delaying. Those arguments are worth raising, but they are far harder to win than simply filing on time.
If you have been injured at work and are unsure whether you gave proper notice or whether your filing deadline has passed, the attorneys at The Law Offices of Millon & Peskin, Ltd. can review your situation and tell you where you stand. Learn more about how we represent injured workers in Illinois workers’ compensation cases. We serve injured workers throughout the Chicagoland area, including DuPage, Cook, Will, Kane, and Lake counties. Call 630-449-3884 for a free consultation.