Is Illinois an at-will state?

“Our supreme court crafted an exception to this rule where ‘an employee handbook or other policy statement creates enforceable contractual rights if the traditional requirements for contract formation are present.’”

Before you fire someone: the step-by-step checklist

What it means for Illinois employers

Illinois courts start from a presumption: a person hired without a fixed term is an at-will employee who can be let go for any cause, provided the firing does not violate clearly mandated public policy. Turner v. Memorial Medical Center (2009) restates that rule and, in the same breath, calls the exception a limited and narrow cause of action. For an Illinois employer, that means two separate checks before a termination: what the company has promised in writing, and why the person is being let go. (Turner v. Memorial Medical Center, Ill. Sup. Ct. No. 107317 (2009); Ross v. May Co., Ill. App. Ct. No. 1-06-0239 (2007))

The contract check comes from Duldulao. A handbook or other policy statement binds the employer when the ordinary elements of contract formation are present, which the Illinois courts break into three conditions: the language is a promise clear enough that an employee would reasonably believe an offer has been made; the employee knows what it says; and the employee accepts by starting or continuing to work. The handbook at issue in Ross v. May Co. contained exactly that kind of progressive discipline language. (Ross v. May Co., Ill. App. Ct. No. 1-06-0239 (2007))

Timing of disclaimers matters in this state. In Ross v. May Co. (Ill. App. Ct. No. 1-06-0239, 2007), the appellate court held that disclaimers inserted into revised handbooks did not modify an earlier handbook contract, because the employee received no consideration for the change. An at-will statement in the original handbook and offer documents therefore does work that a later edition may not do. (Ross v. May Co., Ill. App. Ct. No. 1-06-0239 (2007))

The tort check comes from Kelsay and Palmateer. Kelsay v. Motorola (1978) first recognized retaliatory discharge for an employee fired for filing a workers' compensation claim; Palmateer (1981) extended it to an employee fired after giving information to law enforcement about possible criminal activity by a coworker. Turner frames the exception around a discharge in retaliation for the employee's activities that violates a clear mandate of public policy. Palmateer says that policy is found in the State's constitution and statutes and, when they are silent, in its judicial decisions, and that a matter must strike at the heart of a citizen's social rights, duties, and responsibilities before the tort will be allowed. (Turner v. Memorial Medical Center, Ill. Sup. Ct. No. 107317 (2009); Illinois Pattern Jury Instructions (Civil) 250.00, Retaliatory Discharge)

Exceptions and special cases

• Handbook or policy statement as a contract: recognized. Duldulao v. Saint Mary of Nazareth Hosp. Ctr. (Ill. 1987), 115 Ill. 2d 482, as quoted in Ross v. May Co. (Ill. App. Ct. No. 1-06-0239, 2007) and Unterschuetz v. City of Chicago (No. 1-02-2871). (Unterschuetz v. City of Chicago, Ill. App. Ct. No. 1-02-2871; Ross v. May Co., Ill. App. Ct. No. 1-06-0239 (2007))
• Retaliatory discharge in violation of clearly mandated public policy: recognized, and described by the Illinois Supreme Court as limited and narrow. Kelsay v. Motorola, Inc., 74 Ill. 2d 172 (1978); Palmateer v. International Harvester Co., 85 Ill. 2d 124 (1981); Turner v. Memorial Medical Center, Ill. Sup. Ct. No. 107317 (2009). (Turner v. Memorial Medical Center, Ill. Sup. Ct. No. 107317 (2009))
• An actual discharge is required. The Illinois pattern jury instruction comments (IPI 250.00) note that the tort does not reach a demotion or other discrimination short of firing in retaliation for a workers' compensation claim (Zimmerman v. Buchheit of Sparta, 1994), and that in workers' compensation cases the action lies against the employer, not the individual agent who carried out the discharge (Buckner v. Atlantic Plant Maintenance, 1998). (Illinois Pattern Jury Instructions (Civil) 250.00, Retaliatory Discharge)

Worked examples

A handbook promising three warnings

An Aurora manufacturer's handbook says employees will receive a verbal warning, a written warning and a final warning before any dismissal, and new hires sign that they have read it. Measured against the three Duldulao conditions, the wording is a clear promise, the employee knew it, and the employee kept working. That is the pattern Illinois courts treat as capable of creating contractual rights, which is why the at-will statement and the discipline section need to say the same thing. (Ross v. May Co., Ill. App. Ct. No. 1-06-0239 (2007))

Adding a disclaimer years later

A Peoria clinic that issued a promissory handbook in its early years adds an at-will disclaimer to the current edition. Ross v. May Co. held that later disclaimers did not modify an existing handbook contract without consideration, so the new edition cannot be assumed to reach employees hired under the old one. (Ross v. May Co., Ill. App. Ct. No. 1-06-0239 (2007))

The paperwork after a discharge on Friday, October 2, 2026

A Chicago employer ends an at-will job on Friday, October 2, 2026, and its next regular payday is Friday, October 9, 2026. Under 820 ILCS 115/5, as explained by the Illinois Department of Labor, final compensation is paid at separation if possible and no later than October 9, including earned commissions, bonuses and the value of earned vacation. The IDES pamphlet What Every Worker Should Know About Unemployment Insurance goes to the worker that day, or by mail to the last known address within five days if handing it over is impracticable, which means by Wednesday, October 7, 2026. (Illinois Department of Labor, Wage Payment FAQ (820 ILCS 115/5); IDES, What Every Worker Should Know About Unemployment Insurance (CLI111L))

How to act on it

At-will: Illinois and neighboring states

Each state links to its rulebook. Only rules we verified are shown.

Questions about Illinois at-will rules

The verified rules behind this page (4)

• Implied contract: Illinois recognizes that an employee handbook or other policy statement can create enforceable contractual rights that limit at-will employment when the traditional requirements for contract formation are met (Duldulao v. Saint Mary of Nazareth Hospital Center). (Ross v. May Co. (Ill. App. Ct., 1st Dist., No. 1-06-0239, 2007), quoting Duldulao v. Saint Mary of Nazareth Hospital Center, 115 Ill. 2d 482, 490 (1987); Unterschuetz v. City of Chicago (Ill. App. Ct., 1st Dist., No. 1-02-2871), discussing Duldulao v. Saint Mary of Nazareth Hospital Center, 115 Ill. 2d 482, 490 (1987); verified Sep 24, 2026)
• Public policy: Illinois recognizes the tort of retaliatory discharge: an employer may fire an at-will employee for any reason or no reason, except when the discharge violates a clearly mandated public policy (Kelsay v. Motorola; Palmateer v. International Harvester). The Illinois Supreme Court describes the tort as limited and narrow. (Turner v. Memorial Medical Center, 233 Ill. 2d 494 (2009) (Ill. Sup. Ct. Docket No. 107317), quoting Barr v. Kelso-Burnett Co., 106 Ill. 2d 520 (1985); Illinois Pattern Jury Instructions (Civil), 250.00 Retaliatory Discharge, Comments; verified Sep 24, 2026)
• A separated employee must be paid final compensation in full at separation if possible, and no later than the next regularly scheduled payday. (Illinois Wage Payment and Collection Act, 820 ILCS 115/5 (Illinois Department of Labor FAQ); Illinois Department of Labor, Your Rights Under Illinois Employment Laws poster (2023); verified Sep 27, 2026)
• Illinois employers must give the IDES pamphlet 'What Every Worker Should Know About Unemployment Insurance' to each worker laid off for seven days or more or separated for any reason, at the time of separation; if that is impracticable, it must be mailed to the worker's last known address within five days of separation. (IDES pamphlet CLI111L, What Every Worker Should Know About Unemployment Insurance; IDES Notice to Employees (poster required by the Illinois Unemployment Insurance Act); verified Sep 24, 2026)

Sources (8)

• Turner v. Memorial Medical Center, Ill. Sup. Ct. No. 107317 (2009)
• Illinois Pattern Jury Instructions (Civil) 250.00, Retaliatory Discharge
• Ross v. May Co., Ill. App. Ct. No. 1-06-0239 (2007)
• Unterschuetz v. City of Chicago, Ill. App. Ct. No. 1-02-2871
• Illinois Department of Labor, Wage Payment FAQ (820 ILCS 115/5)
• IDES, What Every Worker Should Know About Unemployment Insurance (CLI111L)
• Illinois Department of Labor, Your Rights Under Illinois Employment Laws poster (2023)
• IDES Notice to Employees (poster required by the Illinois Unemployment Insurance Act)

Checked Sep 27, 2026 · How we verify every rule · Report an error

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