Illinois Business Income Tax Deadline Extended

The complexity of changes resulting from recent federal tax reform and the availability of guidance at the federal level has resulted in the deadline for abatement of penalties for late filing being extended to Nov. 15, according to the Illinois Department of Revenue. 

The extension is for Forms IL-1120, IL-1120-ST, IL-1065 and IL-1041, and will be judged by “reasonable cause” on a case-by-case basis, provided the forms are filed on or before Nov. 15. The agency said requests for abatement should be made after a notice has been sent and received by the taxpayer.  The taxpayer’s request for abatement of late filing penalties due to reasonable cause shall be submitted by email to: or in writing at:

Illinois Department of Revenue Problems Resolution Division P.O. Box 19014 Springfield, IL. 62794-9014

Chapin Rose

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