Ill. Admin. Code tit. 4, § 1025.40
a) If an individual desires to file a formal written grievance, the individual shall promptly, but no later than 180 days after the alleged discrimination, submit the grievance to the Designated Coordinator in writing on the grievance form prescribed for that purpose. The Department shall accept all complete grievance forms under this Section. If the complainant submits an incomplete grievance form, the Department shall notify the complainant and specify the additional information needed to complete the form. If the complainant fails to complete and resubmit the grievance form with the additional information requested within the aforesaid 180 day period, the Department shall close the grievance. The grievance form shall include: