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IL-1040 ELECTRONIC FILERS: We are currently experiencing delays in processing the electronic acknowledgment message for IL-1040’s due to the high volume of returns filed at the end of the filing period. We anticipate these acknowledgments will be completed within the next 24 hours. Please do not file another return until you receive this acknowledgment. If your return is rejected, you will need to file another return.
NOTICE: Changes to the Withholding Income Tax have taken effect January 1, 2017. Click here for more information. 1st quarter returns are due May 1, 2017.