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2024 Corporate Income Tax Forms
| Name | Instructions | Description |
|---|---|---|
| IL-1120 | Corporation Income and Replacement Tax Return Update 07/18/2025 - In accordance with P.A. 104-0006, the instructions have been updated to provide guidance on how to report capital gains or losses from sales or exchanges of shares and of interests in pass-through entities. See the "Apportionment Formulas" section for more information. |
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| IL-1120-V | Payment Voucher for Corporation Income and Replacement Tax To make a return or extension payment, use this voucher and Appendix A of Form IL-1120 Instructions. To make an estimated payment, use this voucher and Appendix B of Form IL-1120 Instructions. Important: Ensure the proper month and year of the filing period you wish to make a payment for is entered on the "Tax year ending" lines of the voucher. |
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| IL-1120-X |
PDF |
Amended Corporation Income and Replacement Tax Return |
| IL-1120-X-V | Payment Voucher for Amended Corporation Income and Replacement Tax Important: Ensure the proper month and year of the filing period you wish to make a payment for is entered on the "Tax year ending" lines of the voucher. |
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| IL-477 | Replacement Tax Investment Credits | |
| IL-2220 | Computation of Penalties for Businesses |
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| IL-4562 | Special Depreciation Update 07/31/2025 - The instructions have been updated to correspond with Public Law 119-21 that made significant changes to bonus depreciation, including restoring 100% bonus depreciation for property acquired and placed in service after January 19, 2025. |
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| Schedule INL | Illinois Net Loss Adjustments for Cooperatives and REMIC Owners | |
| Schedule INS | Tax for Foreign Insurers | |
| Schedule J | Foreign Dividends |
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| Schedule M | Other Additions and Subtractions (for businesses) |
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| Schedule NB |
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Nonbusiness Income Update 07/18/2025 - In accordance with P.A. 104-0006, the instructions have been updated to provide guidance on how to report capital gains or losses from sales or exchanges of shares and of interests in pass-through entities. See the instructions for Lines 7, 8, and 9 for more information. |
| Schedule NLD | Illinois Net Loss Deduction | |
| Schedule UB |
Combined Apportionment for Unitary Business Group | |
| Schedule UB/INS | Tax for a Unitary Business Group with Foreign Insurer Members | |
| Schedule UB/NLD | Unitary Illinois Net Loss Deduction | |
| Schedule 80/20 | Related-Party Expenses | |
| Schedule 1299-B | PDF |
River Edge Redevelopment Zone or Foreign Trade Zone (or sub-zone) Subtractions (for corporations and fiduciaries) |
| Schedule 1299-D | Income Tax Credits (for corporations and fiduciaries) | |
| Schedule 1299-I | Income Tax Credits Information and Worksheets Updated 03/25/2025 - Taxpayers claiming the REV Illinois Investment Credit or MICRO Investment Credit are now required to attach a copy of their worksheet rather than a DCEO certificate. |
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| Schedule 4255 | ||
| Subgroup Schedule (UB) | PDF |
Subgroup Schedule |