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About IDOR
| Tax Return Period: 01/01/2011 - 12/31/2011 |
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|---|---|
| Test transmissions will be accepted: | December 1, 2011 |
| Production transmissions will be accepted: | January 17, 2012 |
| Last date for timely paid IL-1040 returns: | April 17, 2012 |
| Last date to transmit IL-1040 returns: | October 15, 2012 |
| Illinois electronic filing system shuts down: | October 25, 2012 |
| Retention of acknowledgment file materials: | December 31, 2012 |
| Retention of electronic return-related materials for nonpaid preparers: | December 31, 2012 |
| Retention of electronic return-related materials for paid
preparers: (Including original Forms IL-8453 and attachments) |
3 years |