In Illinois, all employers with one or more employees are required to carry workers’ compensation insurance, which can be obtained through a private insurer or by qualifying for self-insurance if the employer meets specific criteria. Sole proprietors and partners are generally excluded from mandatory coverage but have the option to opt-in. Corporate officers and LLC members can also be excluded unless they choose to be covered. Illinois’ system provides comprehensive benefits, including medical care, wage replacement, and vocational rehabilitation services for injured workers. The Illinois Workers’ Compensation Commission oversees compliance, enforcing regulations and imposing penalties on employers who fail to provide the required coverage, thereby protecting workers’ rights and benefits.