Returns and payments due December 5 are now due December 6

12/5/2018

Illinois taxpayers have an extra day to pay any Illinois tax or file any return due on December 5, 2018.

The due date extension is the result of the December 1 Executive Order closing all federal agencies on December 5, as a mark of respect for George Herbert Walker Bush, the forty-first President of the United States.

The Department has updated the chart of the 2018 Illinois Withholding Income Tax Due Dates.