Under the Minimum Wage Law and the Illinois Wage Payment and Collection Act, an employer is obligated to pay an employee for all time worked. Below is information about laws and regulations, including wages, benefits, safety and health, that affect businesses and workers within the State of Illinois.For more information or to file a complaint about an employer's practices, please call the Workplace Rights Hotline at 1-844-740-5076 or use the complaint form. Form ILW4: You also need to give employees Form ILW4, the Employee's Illinois Withholding Allowance Certificate, to fill out. The IHRA applies to nearly all employers in Illinois, including those employing less than 15 employees. The Illinois workers' compensation law requires employers to have insurance to cover work-related injuries and occupational diseases regardless of fault. They cover a range of topics from minimum wage and overtime pay to leave entitlements and workplace safety regulations. The Illinois workers' compensation law requires employers to have insurance to cover work-related injuries and occupational diseases regardless of fault. A plethora of federal, state and local employment laws will take effect in 2024. Here is what employers must know: Federal Law.