The Illinois workers compensation act — formally the Illinois Workers’ Compensation Act, found at 820 ILCS 305 (Illinois Compiled Statutes, Chapter 820 Employment, Act 305) — is the statute behind every workers’ comp claim, benefit and employer mandate in the state.
This plain-English guide to the Illinois workers compensation act gives the section numbers next to the rules people actually need: who must be covered, the deadlines, the waiting period, the pay rate, the exclusive-remedy bargain, the ban on retaliation and the penalties. Verified against the official code as of October 2026.
Illinois at a Glance
| Official name | Workers’ Compensation Act |
| Where it lives | 820 ILCS 305 (Illinois Compiled Statutes, Chapter 820 Employment, Act 305) |
| First enacted | 1911 (in effect May 1, 1912) |
| Reporting deadline | Notice to the employer as soon as practicable, and no later than 45 days after the accident (820 ILCS 305/6(c)) |
| Filing deadline | An application must be filed with the Commission within 3 years after the accident, or within 2 years after the last payment of compensation, whichever is later (820 ILCS 305/6(d)) |
| Exclusive remedy | 820 ILCS 305/5(a) and 305/11 bar common-law or statutory damage suits against the employer or its insurer. The main exception, from case law and not the statute, is an injury the employer specifically intended. 820 ILCS 305/5(b) keeps suits against negligent third parties open, subject to the employer’s lien. |
| Recent amendments | P.A. 103-0590 took effect June 5, 2024 (FY2025 budget implementation, including changes to the IWCC Operations Fund surcharge in 305/4d). P.A. 104-0792 (HB 5228) took effect August 7, 2026, on signing. It added a 90-day limit for certain employer-requested medical exams (Section 12 exams, often called IMEs) used to dispute treatment, and requires the examiner to be board-certified in the treating provider’s specialty. It also tightened who can issue or review a utilization-review denial: unrestricted license, current board certification, and relevant clinical experience. Finally, it created a rebuttable presumption supporting Section 16 attorney fees and Section 19(l) penalties when an employer does not comply. |
In This Illinois Guide:
What the Illinois Workers Compensation Act Is
An workers’ compensation act is an no-fault deal written into state law: the employer pays for work injuries without the worker proving fault, and the worker gives up most lawsuits against the employer in return. The Illinois workers compensation act dates to 1911 (in effect May 1, 1912).
It lives at 820 ILCS 305 (Illinois Compiled Statutes, Chapter 820 Employment, Act 305), and the official text is linked in the sources. Under 820 ILCS 305/4(d), the Injured Workers’ Benefit Fund may pay workers whose employer had no insurance. Under 820 ILCS 305/8(a), the worker generally chooses their own doctors (two physicians, plus their chain of referrals).
Permanent partial disability awards are calculated using the impairment factors in 820 ILCS 305/8.1b. Many claimants should confirm their specifics with the IWCC and a licensed attorney.
Who the Illinois Workers Compensation Act Covers
820 ILCS 305/4(a) requires employers covered by the Act to insure or self-insure their liability; 305/3 lists the enterprises covered automatically. There is no minimum number of employees, so it generally reaches employers with 1 or more employees. 820 ILCS 305/3 exempts agricultural or aquacultural enterprises using fewer than 400 working days of farm labor per quarter in the preceding calendar year, not counting the employer’s live-in immediate family.
820 ILCS 305/1 leaves out real estate brokers and salespersons paid only by commission.
Deadlines in the Illinois Workers Compensation Act
Waiting period: 820 ILCS 305/8(b). No temporary total disability (TTD) is paid for the first 3 working days, and benefits start on the 4th day. If the incapacity lasts 14 days or more, compensation is paid back to the day after the accident.. Wage-loss rate: 820 ILCS 305/8(b)1. TTD is 66 2/3% of the average weekly wage, calculated under 820 ILCS 305/10.
The current maximum and minimum rates are set under Section 8(b), so check the IWCC’s current rate table..
Illinois Workers Compensation Act: Key Sections at a Glance
The sections of the Illinois workers compensation act that decide most cases, each with its citation:
| Coverage mandate | 820 ILCS 305/4(a) requires employers covered by the Act to insure or self-insure their liability; 305/3 lists the enterprises covered automatically. There is no minimum number of employees, so it generally reaches employers with 1 or more employees. |
| Exemptions | 820 ILCS 305/3 exempts agricultural or aquacultural enterprises using fewer than 400 working days of farm labor per quarter in the preceding calendar year, not counting the employer’s live-in immediate family. 820 ILCS 305/1 leaves out real estate brokers and salespersons paid only by commission. |
| Report an injury | Notice to the employer as soon as practicable, and no later than 45 days after the accident (820 ILCS 305/6(c)) |
| File a claim | An application must be filed with the Commission within 3 years after the accident, or within 2 years after the last payment of compensation, whichever is later (820 ILCS 305/6(d)) |
| Waiting period | 820 ILCS 305/8(b). No temporary total disability (TTD) is paid for the first 3 working days, and benefits start on the 4th day. If the incapacity lasts 14 days or more, compensation is paid back to the day after the accident. |
| Wage-loss rate | 820 ILCS 305/8(b)1. TTD is 66 2/3% of the average weekly wage, calculated under 820 ILCS 305/10. The current maximum and minimum rates are set under Section 8(b), so check the IWCC’s current rate table. |
| Exclusive remedy | 820 ILCS 305/5(a) and 305/11 bar common-law or statutory damage suits against the employer or its insurer. The main exception, from case law and not the statute, is an injury the employer specifically intended. 820 ILCS 305/5(b) keeps suits against negligent third parties open, subject to the employer’s lien. |
| Retaliation | 820 ILCS 305/4(h) makes it unlawful to discharge, threaten to discharge, or refuse to rehire or recall an employee for using rights under the Act, or to interfere with, coerce, or discriminate against them for it. The remedy is a civil lawsuit for the tort of retaliatory discharge, recognized in Kelsay v. Motorola (Ill. 1978). |
| Uninsured employer penalty | 820 ILCS 305/4(d). Knowingly failing to provide coverage is a Class 4 felony, and each day is a separate offense. Negligently failing to provide it is a Class A misdemeanor. Failing to comply with an IWCC Insurance Compliance citation carries a civil penalty of up to 500 per day, with a minimum of 10000. The Commission may also issue a stop-work order. |
| Who hears disputes | The Illinois Workers’ Compensation Commission, created under 820 ILCS 305/13, hears disputed claims. Under 820 ILCS 305/19, an arbitrator holds the hearing first, then a 3-member Commission panel can review the decision, and after that the case can go to circuit court and the appellate court’s Workers’ Compensation Commission Division (305/19(f)). |
The Exclusive-Remedy Bargain in the Illinois Workers Compensation Act
820 ILCS 305/5(a) and 305/11 bar common-law or statutory damage suits against the employer or its insurer. The main exception, from case law and not the statute, is an injury the employer specifically intended. 820 ILCS 305/5(b) keeps suits against negligent third parties open, subject to the employer’s lien.
Retaliation and Penalties Under the Illinois Workers Compensation Act
820 ILCS 305/4(h) makes it unlawful to discharge, threaten to discharge, or refuse to rehire or recall an employee for using rights under the Act, or to interfere with, coerce, or discriminate against them for it. The remedy is a civil lawsuit for the tort of retaliatory discharge, recognized in Kelsay v. Motorola (Ill. 1978). 820 ILCS 305/4(d).
Knowingly failing to provide coverage is a Class 4 felony, and each day is a separate offense. Negligently failing to provide it is a Class A misdemeanor. Failing to comply with an IWCC Insurance Compliance citation carries a civil penalty of up to 500 per day, with a minimum of 10000. The Commission may also issue a stop-work order.
The Illinois Workers’ Compensation Commission, created under 820 ILCS 305/13, hears disputed claims. Under 820 ILCS 305/19, an arbitrator holds the hearing first, then a 3-member Commission panel can review the decision, and after that the case can go to circuit court and the appellate court’s Workers’ Compensation Commission Division (305/19(f)).
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Recent Amendments to the Illinois Workers Compensation Act
P.A. 103-0590 took effect June 5, 2024 (FY2025 budget implementation, including changes to the IWCC Operations Fund surcharge in 305/4d). P.A. 104-0792 (HB 5228) took effect August 7, 2026, on signing. It added a 90-day limit for certain employer-requested medical exams (Section 12 exams, often called IMEs) used to dispute treatment, and requires the examiner to be board-certified in the treating provider’s specialty.
It also tightened who can issue or review a utilization-review denial: unrestricted license, current board certification, and relevant clinical experience. Finally, it created a rebuttable presumption supporting Section 16 attorney fees and Section 19(l) penalties when an employer does not comply.
How to Read the Illinois Workers Compensation Act
Statute pages are written for lawyers, so read the Illinois workers compensation act in this order: the definitions section (who is an employee), the coverage section, then the specific section for your question, using the citations above. The official code is the source; the summaries on legal-information sites are not.
If a section of the Illinois workers compensation act seems to conflict with what an insurer told you, the section wins — and the state agency’s information line can confirm it for free.
Applying the act: the Illinois claim guide turns these sections into steps and dates, and the Illinois requirements guide covers the employer side.
Frequently Asked Questions
Where is the Illinois workers compensation act in the code?
820 ILCS 305 (Illinois Compiled Statutes, Chapter 820 Employment, Act 305). The sources below link to the official text.
How long do I have to report a work injury under the Illinois act?
Notice to the employer as soon as practicable, and no later than 45 days after the accident (820 ILCS 305/6(c)). Report in writing as soon as possible either way.
Can I sue my employer instead of using the Illinois workers compensation act?
Usually not — the exclusive-remedy section bars most lawsuits against a covered employer. Claims against third parties, and against an uninsured employer, are the common exceptions.
Official Illinois Sources & Resources
- Illinois Illinois Workers’ Compensation Commission (IWCC): https://iwcc.illinois.gov
- Illinois Workers’ Comp Statute: https://iwcc.illinois.gov/content/dam/soi/en/web/iwcc/documents/act.pdf
- U.S. Department of Labor — Workers’ Comp: dol.gov
- Insurance Information Institute: iii.org
This Illinois workers compensation act guide was last verified against official Illinois sources in October 2026. Rules change — confirm the current figure with the state agency or a licensed attorney.
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Disclaimer: This guide is informational only and is not legal, medical, or financial advice. Workers Comp Explained is an independent educational resource, not a law firm or insurer. Workers’ comp benefits, settlement values, deadlines, and requirements vary by state and by the specific facts of your injury and change over time, and any settlement figures here are illustrative only.
Confirm your rights and any deadline with your state’s workers’ compensation board and a licensed attorney before you act.