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
E-filing information | 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 Corporations filing Form 1120-POL 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. |
