1120 Illinois electronic filing information

State contact information

If you have specific questions about what you can e-file or about rejections you received, contact the state for more information.
Electronic Filing Division
P O Box 19479
Springfield, IL 62794-9479
Phone
: 866.440.8680

State electronic filing details

Grace period
10 calendar days
E-filing mandate
Yes, when required to e-file federal.
Accepts state-only filings
Yes
Return types accepted
C Corporation
S Corporation
Consolidated / Combined
Short year (for years ending after December 26)
Estimates
Extension
Return types not accepted
Amended
Short year returns ending before December 26
Accepts returns with these conditions
Refund
Zero balance
Balance due
Direct deposit of refunds
Yes
Accepted forms of payment
Direct debit (EFW)
Electronic funds transfer (EFT allowed for return only)
Check by mail (for return only)
Signature requirements
Illinois accepts federal
Supports PDF attachments
No
Tax year(s) supported for e-filing
Current tax year and two prior tax years
Special considerations
If you file an extension electronically, you must pay via EFW.

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