Electronic Filing Calendar (IL-1040)

Tax Return Period: 01/01/2013 - 12/31/2013
Test transmissions will be accepted:	December 20, 2013
Production transmissions will be accepted:	January 31, 2014
Last date for timely paid IL-1040 returns:	April 15, 2014
Last date to transmit timely filed IL-1040 returns:	October 15, 2014
Illinois electronic filing system shuts down:	To be determined*
Retention of acknowledgment file materials:	December 31, 2014
Retention of electronic return-related materials for non paid preparers:	December 31, 2014
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.