Illinois Employment Law: Rights, Pay, and Classification

This reference explains how employment works in Illinois for private-sector workers and the businesses that employ them. It covers the at-will default and its exceptions, the line between employees and independent contractors, wage and hour rules, anti-discrimination protections, and where each rule is enforced. It does not cover public-sector collective bargaining, union representation procedures, or workers’ compensation, each of which runs on its own statute.

What Illinois employment law covers

Illinois employment law is a layer on top of federal law, not a replacement for it. Where a state rule gives workers more than the federal floor, the state rule governs. Federal law sets a minimum wage of $7.25 an hour under 29 U.S.C. § 206, while Illinois requires substantially more, so most Illinois employers follow the state figure.

Most of the state rules live in Chapter 820 of the Illinois Compiled Statutes, which collects the Minimum Wage Law, the Wage Payment and Collection Act, the Employee Classification Act, and dozens of narrower acts. Discrimination rules sit separately, in the Illinois Human Rights Act in Chapter 775. The sections below introduce the vocabulary these statutes use and point to the specific procedures that have their own articles.

At-will employment and its limits

Illinois follows the at-will rule. Either the worker or the employer can end the relationship at any time, for any reason or no reason, unless a contract or a statute says otherwise. At-will is a common-law default that Illinois courts have applied for more than a century; it is a starting point, not an absolute.

Several things override the default. A written contract, an offer letter with a fixed term, or a collective bargaining agreement can limit when and how a worker is let go. A statute can also carve out protected conduct. Firing a worker for making a wage complaint is prohibited under 820 ILCS 105/11, and Illinois courts separately recognize a retaliatory-discharge claim when a firing violates a clear public policy, such as terminating someone for filing a workers’ compensation claim or reporting illegal activity.

Anti-discrimination law is the largest limit on at-will firing. An employer may end an at-will relationship for many reasons, but not because of a characteristic the Illinois Human Rights Act protects. That distinction, rather than the at-will label itself, is what most disputes turn on.

Employee or independent contractor

Whether a worker is an employee or an independent contractor decides who owes minimum wage, overtime, payroll taxes, and unemployment contributions. Illinois does not use one universal test; the test depends on the law being applied.

For unemployment insurance and most wage purposes, the state uses a version of the “ABC test.” Under the Illinois Unemployment Insurance Act (820 ILCS 405), services a person performs for pay count as covered employment unless the hiring party shows that the worker is free from its control and direction, performs work outside the usual course or place of the business, and is engaged in an independently established trade. All three conditions must be met for the worker to fall outside the employee category.

Construction has its own, stricter rule. The Employee Classification Act (820 ILCS 185) treats an individual performing construction services as an employee unless the contractor can show the worker meets the Act’s independent-contractor criteria or is a legitimate separate business entity. The presumption runs in favor of employee status, and a contractor that misclassifies workers can face penalties and back liability.

Minimum wage, overtime, and how you are paid

The Illinois minimum wage reached $15.00 an hour on January 1, 2025, the last step of a schedule set in 820 ILCS 105/4. The Minimum Wage Law generally applies to employers with four or more employees, though separate federal rules can reach smaller ones. Workers under 18 who work limited hours, and new adult hires during a short training period, can be paid a lower rate the same section defines.

Overtime is one and one-half times the regular rate for hours worked beyond 40 in a workweek under Illinois law, at 820 ILCS 105/4a, which tracks the federal overtime standard in 29 U.S.C. § 207. Certain executive, administrative, professional, and outside-sales roles are exempt from overtime. Some Illinois localities, including Chicago and Cook County, set their own higher minimum wage by ordinance, so the applicable floor can be above the state figure depending on where the work is performed.

How and when wages are paid is governed by the Illinois Wage Payment and Collection Act (820 ILCS 115). Most workers must be paid at least semi-monthly, and a worker who leaves or is let go is entitled to final compensation, including earned but unused vacation, at the time of separation when possible and no later than the next regularly scheduled payday.

Discrimination and equal pay

The Illinois Human Rights Act (775 ILCS 5) prohibits employment discrimination based on protected characteristics, including race, color, religion, sex, national origin, ancestry, age, disability, pregnancy, sexual orientation, and gender identity. It applies to hiring, firing, pay, promotion, and the terms and conditions of work, and it reaches many employers that are too small for the main federal statute to cover.

Federal anti-discrimination law overlaps but is narrower on size. Title VII of the Civil Rights Act generally applies to employers with 15 or more employees, as the EEOC explains in its coverage guidance. Because the Illinois Human Rights Act covers smaller employers, a worker at a small business in Illinois may have a state claim where no federal claim exists.

Pay equity has a dedicated statute. The Illinois Equal Pay Act of 2003 (820 ILCS 112) bars paying employees differently for substantially similar work on the basis of sex or race, apart from differences justified by seniority, merit, or a system that measures production.

Records, non-competes, and staffing-agency work

Illinois gives workers several rights that sit outside the pay and discrimination rules. Under the Personnel Record Review Act (820 ILCS 40), an employee can inspect and copy the personnel records an employer keeps and used to make employment decisions.

Non-compete agreements are limited by earnings. The Illinois Freedom to Work Act (820 ILCS 90) makes a covenant not to compete void unless the worker’s annualized earnings exceed $75,000 a year, a figure that rises to $80,000 on January 1, 2027. Non-solicitation covenants have a lower earnings threshold that rises on the same schedule. Agreements below the thresholds are unenforceable regardless of what a worker signed.

Workers placed through staffing agencies have added protections under the Day and Temporary Labor Services Act (820 ILCS 175), which regulates how day-and-temporary labor service agencies pay, notify, and account to the laborers they place.

How these rules are enforced

No single agency handles every employment issue in Illinois. Wage, overtime, and final-pay complaints go to the Illinois Department of Labor, which can investigate and order payment, or a worker can sue directly under the Wage Payment and Collection Act. Worker-classification questions for unemployment purposes are handled by the Illinois Department of Employment Security, which applies the ABC test described above.

Discrimination charges start with the Illinois Department of Human Rights, which investigates and can refer matters to the Illinois Human Rights Commission; a parallel federal charge can be filed with the EEOC. Each of these paths has its own filing deadline set by the governing statute, and the deadlines differ, so the applicable window depends on the type of claim and the agency involved. The specific procedures, forms, and time limits for each are covered in the articles below.

Specific procedures and topics