Illinois Department of Revenue
 
 
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Electronic Filing Calendar (IL-1040)

 
 
Tax Return Liability Period: 01/01/2014 - 12/31/2014
Test transmissions will be accepted: To be determined
Production transmissions will be accepted: To be determined
Last date for timely paid IL-1040 returns: April 15, 2015
Last date to transmit timely filed IL-1040 returns: October 15, 2015
Illinois electronic filing system shuts down: To be determined*
Retention of acknowledgment file materials: December 31, 2015
Retention of electronic return-related materials for non paid preparers: December 31, 2015
Retention of electronic return-related materials for paid preparers:
(Including original Forms IL-8453 and attachments)
3 years
*Illinois will follow the IRS calendar for shut down.
 
 
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