Wrongful Termination in Illinois: When Firing Is Illegal

This article is part of the reference on Illinois employment law. It explains when a firing crosses from unfair into illegal, which state and federal laws apply to each kind of claim, where a claim is filed, and the deadlines that control it.

What counts as wrongful termination in Illinois

Illinois follows the rule of employment at will. Under that rule, an employer can fire an employee for a good reason, a bad reason, or no reason at all, and an employee can quit on the same terms. A firing that is merely unfair, harsh, or mistaken is not by itself against the law. The Illinois Attorney General’s office summarizes the baseline workplace rights that employees keep and the situations where a firing crosses the line.

The at-will rule has limits. A termination is unlawful when the reason behind it is one the law specifically prohibits. Illinois and federal law recognize several of these prohibited reasons:

• Discharge because of a protected characteristic, such as race, sex, age, or disability
• Retaliation for reporting illegal activity or a danger to public health or safety
• Retaliation for exercising a legal right, such as filing a workers’ compensation claim
• Discharge that breaks an express or implied employment contract or a collective bargaining agreement

The sections below cover the categories that generate most Illinois wrongful termination claims, and the agency or court that handles each.

Firing based on discrimination

The Illinois Human Rights Act makes it a civil rights violation for an employer to discharge an employee on the basis of unlawful discrimination. Under 775 ILCS 5/2-102, an employer may not act with respect to discharge, discipline, or the terms of employment on the basis of a protected characteristic. Protected categories under the Act include race, color, religion, national origin, ancestry, age, sex, pregnancy, disability, sexual orientation, gender identity, and military status, among others.

Most Illinois employees are also covered by federal law. Title VII of the Civil Rights Act of 1964 makes it unlawful for a covered employer to discharge an individual because of race, color, religion, sex, or national origin, under 42 U.S.C. § 2000e-2. Separate federal statutes cover age and disability. The state Act generally applies to employers with one or more employees, while Title VII applies to employers with 15 or more, so state coverage reaches many small workplaces that federal law does not.

A discrimination-based firing rarely comes with a written admission. These cases usually turn on circumstantial evidence: the timing of the discharge, how comparable employees outside the protected group were treated, shifting or inconsistent explanations, and any discriminatory remarks. The Illinois Department of Human Rights and the federal Equal Employment Opportunity Commission (EEOC) investigate these charges.

Firing for whistleblowing or reporting violations

The Illinois Whistleblower Act protects employees who report suspected illegal conduct. Under 740 ILCS 174/15, an employer may not take retaliatory action against an employee who discloses, or threatens to disclose, information about an activity the employee has a good faith belief violates a state or federal law, rule, or regulation, or that poses a substantial and specific danger to employees or to public health or safety.

The protection covers disclosures to a government or law enforcement agency, disclosures in a court or administrative proceeding, and, since the Act was expanded, certain internal reports to a supervisor or officer. The key elements are the employee’s good faith belief and a link between the report and the firing. An employee does not have to be correct that the law was broken, as long as the belief was held in good faith.

Retaliation protections run through other parts of Illinois employment law as well. The Illinois Paid Leave for All Workers Act bars an employer from firing a worker for requesting or taking paid leave, and Illinois break laws protect meal periods and the weekly day of rest. A discharge aimed at punishing an employee for using any of these rights can support a retaliation claim.

Illinois courts also recognize a common law claim for retaliatory discharge in violation of public policy. That claim covers firings meant to punish an employee for acting in a way the law encourages or for refusing to break the law. The workers’ compensation situation described below is the most established example.

Firing for filing a workers’ compensation claim

Illinois law directly forbids punishing an employee for using the workers’ compensation system. Under 820 ILCS 305/4(h), it is unlawful for an employer to discharge, to threaten to discharge, or to refuse to rehire or recall an employee because that employee exercised rights or remedies under the Workers’ Compensation Act.

This protection applies whether the employee has already filed a claim, is in the process of filing, or has simply reported a workplace injury. A retaliatory discharge claim tied to workers’ compensation is brought as a civil lawsuit in circuit court rather than through the Illinois Department of Human Rights. Remedies in a successful retaliatory discharge case can include lost wages and, in some cases, additional damages.

Termination that breaks an employment contract

At-will employment is the default, but it can be displaced by a contract. When an employer and employee agree to terms that limit the right to fire, a discharge that violates those terms can be a breach of contract rather than a lawful at-will firing.

Contract-based protection can come from a written employment agreement that promises a fixed term or allows termination only “for cause,” a collective bargaining agreement negotiated by a union, or, in some cases, promises in an employee handbook that a court treats as an implied contract. Public employees may also have protections from civil service rules or statutes. A breach of contract claim is filed in circuit court, and the question is usually whether an enforceable promise limited the employer’s right to fire and whether that promise was broken.

How to file a claim and the deadlines that apply

The right forum depends on the type of claim. A discrimination or retaliation claim under the Illinois Human Rights Act starts with a charge filed with the Illinois Department of Human Rights (IDHR). A parallel federal claim starts with a charge filed with the EEOC. Because Illinois has its own civil rights agency, a charge filed with one agency can be cross-filed with the other. Contract and workers’ compensation retaliation claims are filed directly as lawsuits in circuit court.

1. Gather documentation

   Collect the records that show what happened and when: the termination notice, pay records, performance reviews, relevant emails or texts, and any complaints or reports you made before the firing. The date of the firing sets the clock on every deadline below.

2. Identify the right agency or court

   A discrimination or retaliation claim under the Human Rights Act goes to the IDHR, and a parallel federal claim goes to the EEOC. A workers’ compensation retaliation claim or a breach of contract claim is filed as a lawsuit in the circuit court for the county where the violation occurred.

3. File the charge within the deadline

   File the IDHR charge within 2 years of the firing, or the EEOC charge within 300 days. Filing with one agency can preserve the parallel claim through cross-filing, but the shorter federal deadline still controls the federal claim.

4. Respond during the investigation

   The agency notifies the employer, gathers position statements, and investigates. Under the Human Rights Act, an employee can also opt out of the IDHR investigation within 60 days of notice and proceed directly to circuit court.

5. Move the claim to court or the Commission

   After the IDHR issues its report, or after 365 days pass without one, the employee has 90 days to either file a complaint with the Illinois Human Rights Commission or file a civil action in circuit court.

The two systems connect. Under 775 ILCS 5/7A-102, a charge filed with the EEOC within 300 days is deemed filed with the IDHR on the same date, and the state agency generally waits for the EEOC’s determination before acting. After an investigation, the employee receives a notice describing the right to bring the case to the Illinois Human Rights Commission or to court within the time the notice states.