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2023 Small Business Corporation Replacement Tax Forms

Name Description
IL-1120-ST
Instructions
Small Business Corporation Replacement Tax Return (includes Schedule B)
IL-1120-ST-V

Payment Voucher for Small Business Corporation Replacement Tax

To make a return or extension payment, use this voucher and Appendix A of Form IL-1120-ST Instructions.
To make an estimated payment or voluntary prepayment, use this voucher and Appendix B of Form IL-1120-ST 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.

IL-1120-ST-X
Instructions ​Amended Small Business Corporation Replacement Tax Return (includes Schedule B)
IL-1120-ST-X-V

Payment Voucher for Amended Small Business Corporation 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.

IL-477 Instructions Replacement Tax Investment Credits
IL-1000-E Certificate of Exemption for Pass-through Withholding Payments
​IL-2220 Instructions ​Computation of Penalties for Businesses
IL-4562 Instructions Special Depreciation
Schedule F Instructions Gains from Sales or Exchanges of Property Acquired Before August 1, 1969
Schedule K-1-P
Partner's or Shareholder's Share of Income, Deductions, Credits, and Recapture
Schedule K-1-P (1) Instructions for Partnerships and S Corporations Completing Schedule K-1-P and Schedule K-1-P(3)
Schedule K-1-P (2) Partner's and Shareholder's Instructions
Schedule K-1-P (3) Pass-through Withholding Calculation for Nonresident Members
Schedule M Instructions Other Additions and Subtractions (for businesses)
Schedule NB Instructions Nonbusiness Income
Schedule NLD Instructions Illinois Net loss Deduction
Schedule UB
2/23/24 - 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 80/20 Instructions Related-Party Expenses
Schedule 1299-A

Instructions

Tax Subtractions and Credits (for partnerships and S corporations)
Schedule 1299-I Income Tax Credits Information and Worksheets
Schedule 4255

Instructions

Recapture of Investment Tax Credits
Subgroup Schedule (UB) Instructions Subgroup Schedule