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2018 Corporate Income Tax Forms

NameDescription
IL-1120 Instructions Corporation Income and Replacement Tax Return
IL-1120-X Instructions Amended Corporation Income and Replacement Tax Return
IL-1120-V  

Payment Voucher for Corporation Income and Replacement Tax

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​Instructions
Extension Payment Worksheet​
​2019-IL-1120-V​​To make an estimated payment or prepayment for tax years ending on or after December 31, 2019
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Instructions​​Estimated Payment Worksheets
IL-1120-X-V  Payment Voucher for Amended Corporation Income and Replacement Tax
IL-477 Instructions Replacement Tax Investment Credits
IL-2220 Instructions Computation of Penalties for Businesses
IL-4562
 Instructions 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 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 Instructions Income Tax Credits (for corporations and fiduciaries)
​Schedule 1299-I
​​Income Tax Credits Information and Worksheets
Schedule 4255 Instructions Recapture of Investment Tax Credits
Subgroup Schedule (UB) Instructions
Subgroup Schedule