Attach supporting documents to your Form IL-1120-X.
Failure to attach the required documents will result in the disallowance of the corresponding line item.
If you completed:
U.S. 1120-X, and U.S. 1139 or federal RAR (if applicable)
Form IL-1120-X
Schedule UB
Step 1, Line C (unitary) only
Schedule INS
Step 1, Line C (foreign insurer) only
Schedule UB and Schedule UB/INS
Step 1, Line C (unitary) and (foreign insurer)
Copy of federal finalization
Step 1, Line N (federal change)
Form IL-4562
Lines 5 and 18
Special Depreciation addition
Special Depreciation subtraction
Schedule 80/20
Lines 6 and 19
Related-party expenses addition
Related-party expenses subtraction
Schedule(s) K-1-P or K-1-T
Lines 7 and 20
Distributive share of additions
Distributive share of subtractions
Schedule M and any required support listed on Schedule M
Lines 8 and 21
Other additions
Other subtractions
Schedule 1299-B
Lines 11 through 15
River Edge Redevelopment Zone Dividend subtraction
River Edge Redevelopment Zone Interest subtraction
High Impact Business Dividend subtraction
High Impact Business Interest subtractions
Contributions subtraction
Foreign Dividend Subtraction
Illinois Schedule J, and U.S. 1120, Schedule C or equivalent
Line 17
Schedule NB
Lines 24 and 32
Nonbusiness income or loss
Nonbusiness income or loss allocable to Illinois
Schedule(s) K-1-P or K-1-T
Lines 25 and 33
Trusts, estates and non-unitary partnership
business income or loss
Trusts, estates, and non-unitary partnerships
business income or loss apportionable to Illinois
Discharge of Indebtedness adjustment
Federal Form 982
Line 36
Check the box on Form IL-1120-X, Step 1, Line P.
Illinois net loss deduction
Schedule NLD or UB/NLD (for unitary filers)
Line 38
Recapture of investment credit
Schedule 4255
Lines 41 and 46
Investment credits
Form IL-477
Line 43
Income tax credits
Schedule 1299-D and any required support listed in the Schedule
Line 48
1299-D instructions.
Check the box on Form IL-1120-X, Step 1, Line G.
Foreign Insurer tax reduction
Schedule INS or UB/INS
Lines 50a and 51a
Pass-through entity payments
All Schedules K-1-P and K-1-T you received showing a pass-
Line 54d
through entity payment
Gambling withholding
All copies of Form W-2G
Line 54e
This form is authorized as outlined by the Illinois Income Tax Act. Disclosure of this
IL-1120-X (R-12/13)
information is REQUIRED. Failure to provide information could result in a penalty.
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