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2023 Corporate Income Tax Forms
| Name | Description | |
|---|---|---|
| IL-1120 | Corporation Income and Replacement Tax Return | |
| 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. 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 |
Instructions |
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 | Instructions | Replacement Tax Investment Credits |
| IL-2220 | Instructions | Computation of Penalties for Businesses |
| IL-4562 | Special Depreciation | |
| Schedule INL | Instructions | Illinois Net Loss Adjustments for Cooperatives and REMIC Owners |
| Schedule INS | Instructions | Tax for Foreign Insurers |
| Schedule J | Instructions | Foreign Dividends |
| Schedule M | Instructions | Other Additions and Subtractions (for businesses) |
| Schedule NB | Instructions | Nonbusiness Income |
| Schedule NLD | Instructions | Illinois Net Loss Deduction |
| Schedule UB 02/23/24 - Updated Step 2, Line 25, to reflect federal Form 1120, Line 25 (Energy efficient commercial buildings deduction). |
Instructions | Combined Apportionment for Unitary Business Group |
| Schedule UB/INS | Instructions | Tax for a Unitary Business Group with Foreign Insurer Members |
| Schedule UB/NLD | Instructions | Unitary Illinois Net Loss Deduction |
| Schedule 80/20 | Instructions | Related-Party Expenses |
| Schedule 1299-B | Instructions |
River Edge Redevelopment Zone or Foreign Trade Zone (or sub-zone) Subtractions (for corporations and fiduciaries) |
| Schedule 1299-D |
07/10/24 – Updated to include new Quantum Computing Campuses tax credit. |
Income Tax Credits (for corporations and fiduciaries) |
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07/10/24 – Updated to include new Quantum Computing Campuses tax credit and to extend expiration dates for credits affected by recently passed legislation. |
Income Tax Credits Information and Worksheets | |
| Schedule 4255 | ||
| Subgroup Schedule (UB) | Instructions |
Subgroup Schedule |