The Illinois due date for individuals, trusts, and corporations to file and pay taxes has been extended to match the federal due date of July 15, 2020. This relief is automatic, an extension does not need to be filed. Click for more details.
Illinois has not extended first quarter estimated taxes for 2020 for calendar year taxpayers, that due date remains 4/15/2020. The second quarter calendar year estimate is due 6/15/2020.
The Illinois Department of Commerce and Economic Opportunity is also working to provide emergency assistance programs for Illinois small businesses. See the following link for the current status of the plan initiatives.
Emergency Small Business Grants and Loans Assistance.