By on Sep 8, 2024 in | 4 comments « All Events This event has passed. Sales & Use (ST-1) September 20, 2018 « Employment Employment » Sales & Use (ST-1) Illinois: Business – Monthly filers required to file Form ST-1 for sales and use tax collected in August Add to calendar Google Calendar iCalendar Outlook 365 Outlook Live Details Date: September 20, 2018