Illinois Layoffs: WARN Act Notice, Exceptions, and Penalties

The Illinois WARN Act requires employers with at least 75 full-time employees to give 60 days’ written advance notice before a mass layoff, plant closing, or relocation, and workers who don’t get that notice can recover up to 60 days of back pay and benefits. The state law reaches smaller employers than the federal WARN Act does, covers relocations that federal law leaves out, and imposes its own penalties on top of anything the federal statute provides.

Which Employers Are Covered

The Illinois WARN Act applies to any business with at least 75 full-time employees, or 75 employees who together work 4,000 or more hours per week, not counting overtime.¹ That threshold is lower than the federal WARN Act, which begins at 100 employees.² Part-time employees are not counted for coverage purposes.

An employer with 80 full-time workers in Illinois may be fully exempt federally but still owe notice, and still face penalties and lawsuits, under state law.

What Triggers the 60-Day Notice

Three events trigger notice under the Illinois WARN Act: a mass layoff, a plant closing, or a relocation. Relocation matters because federal WARN does not treat it as a separate trigger.³

Mass Layoff

A mass layoff is a workforce reduction at a single site, short of a full closing, that causes job losses during any 30-day period for either at least 25 full-time employees who make up at least one-third of the full-time workforce, or at least 250 full-time employees regardless of the percentage.¹

Plant Closing

A plant closing is the permanent or temporary shutdown of a single site, or of one or more facilities within a single site, causing job losses for 50 or more full-time employees during any 30-day period.⁴

What Counts as an Employment Loss

Not every separation counts. An “employment loss” under Illinois WARN is a termination other than a firing for cause, a voluntary quit, or a retirement; a layoff that runs longer than six months; or a cut in work hours of more than 50 percent during each month of any six-month period.¹ The hours-reduction category catches employers who try to push workers out by cutting schedules rather than formally laying them off.

The 90-Day Aggregation Rule

Employers cannot dodge the notice requirement by breaking a large layoff into smaller rounds. Illinois looks 90 days forward and 90 days back from any given action to determine whether separate employment losses collectively reach the mass-layoff or plant-closing threshold. The only way out is to show that each round of layoffs resulted from separate and distinct business causes and was not an attempt to evade the law.⁵

Who Must Receive Notice, and What It Must Say

Covered employers must deliver at least 60 days’ written notice before the first separation takes effect, and the notice goes to three groups.³

Each affected employee must be told whether the action is expected to be permanent or temporary, whether the entire plant is closing, the expected date of the worker’s own separation, whether bumping rights exist, and a company contact for further information.⁶

If a union represents affected employees, the union’s notice must include the site address, the expected date of the first separation and anticipated schedule, the job titles of affected positions, and the names of workers currently holding those positions. The names requirement is unique to union notices.⁶

The employer must also notify the Illinois Department of Commerce and Economic Opportunity, the Illinois Department of Labor, and the chief elected official of each municipal and county government where the layoff or closing will occur. The government notice must include the site address, anticipated schedule of separations, job titles and the number of affected employees in each classification, whether bumping rights exist, and the name of each union representing affected workers.⁶

Exceptions to Full 60-Day Notice

Three exceptions can shorten the 60-day period, but none eliminate the notice obligation. Even when an exception applies, the employer must give as much notice as is practicable and include a written explanation of why the notice period was shorter than 60 days.⁷

The unforeseeable business circumstances exception applies when the layoff or closing results from a sudden, dramatic event outside the employer’s control that could not have been reasonably anticipated when the 60-day notice would have been due. The standard turns on what was reasonably foreseeable at that point, not on whether the employer was surprised. A business that watched its largest client struggle for months cannot credibly call losing the account unforeseeable.

The faltering company exception applies only to plant closings, not mass layoffs. It requires that the employer be actively seeking capital or business that would allow it to avoid or postpone the closing, and that the employer have a reasonable, good-faith belief that giving notice would drive the potential investment or deal away.

The natural disaster exception applies when the layoff or closing is a direct result of a flood, earthquake, storm, or similar event. In that case, notice may be given after the event rather than before.

What Workers Can Recover If Notice Is Skipped

An employer that fails to give the required notice owes each affected worker back pay for each day of the violation, calculated at the higher of the employee’s average regular rate over the preceding three years or the employee’s final rate of pay, plus the value of lost benefits, including medical expenses that would have been covered.¹

The total is capped at 60 days of pay, or half the total number of days the worker was employed by the employer, whichever is less. That second cap matters most for newer employees: a worker hired four months before the layoff is limited to roughly 60 days of back pay.

An employer’s liability is reduced by wages already paid during the violation period, voluntary unconditional payments made to the worker, payments made to third parties on the worker’s behalf such as health insurance premiums, and any amounts already paid under the federal WARN Act for the same violation.¹ No employer pays twice for the same violation under both statutes.

Separately, an employer that fails to notify the required government agencies faces a civil penalty of up to $500 per day of the violation. This penalty does not apply if the employer pays all affected employees the full amount owed within three weeks of ordering the layoff.¹

If the employer can prove to the Director’s satisfaction that the violation was made in good faith and with reasonable grounds for believing it was not a violation, the Director has discretion to reduce the liability.¹ The employer carries the burden, and the reduction is not automatic.

How Illinois WARN Differs From Federal WARN

Both statutes can apply at once. The places they diverge are where employers most often go wrong.

Illinois covers employers with 75 or more full-time employees; federal WARN starts at 100.¹
Illinois WARN treats a relocation as a triggering event; federal WARN does not.³
Illinois requires notice to both DCEO and the Illinois Department of Labor, plus local officials; federal WARN requires notice only to the state’s dislocated worker unit and local government.
Illinois state-law liability is offset by any amount already paid under federal WARN for the same violation.¹

Treating federal compliance as the ceiling instead of the floor is one of the more expensive mistakes Illinois employers make.

Other Rights Around an Illinois Layoff

The WARN Act sits alongside several other rules a laid-off worker will run into within the same weeks.

Final Paycheck

Under the Illinois Wage Payment and Collection Act, employers must pay final compensation in full at the time of separation if possible, and no later than the next regularly scheduled payday. The final paycheck must include earned but unused vacation time paid at the employee’s final rate. Illinois prohibits contracts or policies that would forfeit accrued vacation upon separation, and an employee who asks in writing for the final check to be mailed is entitled to have that request honored.⁸

Health Insurance Continuation

Federal COBRA applies to group health plans of employers with 20 or more employees. After a layoff, the employer must notify the plan within 30 days, and the employee then has 60 days to elect coverage, which is retroactive to the date prior coverage ended.⁹ COBRA coverage generally runs 18 months, and the worker pays the full premium plus a 2 percent administrative fee.¹⁰

Illinois has its own continuation law for insured group plans of any size, so workers at smaller employers below the federal COBRA threshold still have protection. The employee and dependents must have been continuously covered under the plan for at least three months before separation. State continuation coverage lasts up to 12 months at the full group rate with no administrative surcharge. It does not apply to self-insured plans, self-insured union benefit plans, or policies written in another state.

Unemployment Benefits

A layoff is a no-fault separation, so laid-off Illinois workers are generally eligible for unemployment insurance. You must have earned enough wages during a base period within the prior 18 months to establish a weekly benefit amount.¹¹ For 2026, the maximum weekly benefit for an individual is $1,335.¹² Standard state benefits run up to 26 weeks. File with the Illinois Department of Employment Security as soon as possible after the layoff; delayed filing does not raise the benefit and can reduce the total weeks paid. You must be actively seeking work and able to accept suitable employment to keep receiving benefits.

Severance Agreements for Workers Over 40

No Illinois or federal law requires severance, but when an employer offers it in a group layoff, the agreement almost always asks the worker to release the right to sue. For employees aged 40 and older, the federal Older Workers Benefit Protection Act sets specific requirements before that release is enforceable.¹³

In a group layoff, each worker over 40 must be given at least 45 days to review the agreement and an additional 7 days after signing to revoke it. The waiver does not take effect until the 7-day revocation window closes.¹³ The employer must advise the worker in writing to consult an attorney and must disclose the job titles and ages of all employees within the affected unit who are and are not eligible for the layoff program. Skipping any of these steps can void the waiver, meaning the worker keeps the severance and keeps the right to bring an age discrimination claim.

1
Illinois General Assembly. Illinois Code 820 ILCS 65 – Illinois Worker Adjustment and Retraining Notification Act
2
U.S. Department of Labor. WARN Act Compliance Assistance
3
Illinois Department of Commerce and Economic Opportunity. Notices of Layoffs and Closures (WARN)
4
Illinois General Assembly. Illinois Administrative Code Title 56, Part 230 – Section: Definitions
5
Illinois General Assembly. Illinois Administrative Code Title 56, Part 230 – Section: Aggregation
6
Illinois General Assembly. Illinois Administrative Code Title 56, Part 230 – Section: Contents of Employer Notice
7
U.S. Department of Labor. Worker Adjustment and Retraining Notification Act Frequently Asked Questions
8
Illinois General Assembly. Illinois Code 820 ILCS 115 – Wage Payment and Collection Act
9
U.S. Department of Labor. FAQs on COBRA Continuation Health Coverage for Workers
10
U.S. Department of Labor. COBRA Continuation Coverage
11
Illinois Department of Employment Security. UI Eligibility
12
Illinois Department of Employment Security. Weekly Benefit Amount Chart
13
Office of the Law Revision Counsel. United States Code Title 29 Section 626