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About IDOR
| Tax Return Period: 1/1/07 - 12/31/07 |
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|---|---|
| Test transmissions will begin being accepted: | December 1, 2007 |
| Production transmissions will begin being accepted: | January 11, 2008 |
| Last date for timely paid IL-1040 returns: | April 15, 2008 |
| Last date to transmit IL-1040 returns: | October 15, 2008 |
| Illinois electronic filing system shuts down: | October 25, 2008 |
| Retention of acknowledgment file materials: | December 31, 2008 |
| Retention of electronic return-related materials for nonpaid preparers: | December 31, 2008 |
| Retention of electronic return-related materials for paid
preparers: (Including original Forms IL-8453 and attachments) |
3 years |