The Illinois Equal Pay Act of 2003 prohibits employers from paying any employee less than it pays another employee of the opposite sex for the same or substantially similar work requiring equal skill, effort, and responsibility performed under similar working conditions for the same employer in the same county. The Act covers all employers (IL Comp. Stat. Ch. 820 Sec. 112/1).
Under the Act, it is unlawful for an employer to:
• Reduce the wages of any employee in order to comply with the Act.
• Interfere with, restrain, deny, or attempt to deny the exercise of any right under the Act.
• Discharge or otherwise discriminate against any individual for inquiring about, disclosing, comparing, or otherwise discussing any employee's wages or aiding or encouraging any person to exercise his or her rights under the Act.
• Discriminate against any individual who has filed a charge or started a proceeding, has given or testified, or is about to give information or testify in connection with a proceeding related to any right protected under the Act.