Illinois Department of Revenue
Amended Composite Income
2012 IL-1023-C-X
and Replacement Tax Return
For tax years ending on or after December 31, 2012
Write the amount you
Indicate what tax year you are amending: Tax year beginning
, ending
are paying.
month day
year
month day
year
If you are filing an amended return for tax years ending before December 31, 2012,
you cannot use this form. For prior years, use the amended return form for that year.
$
Step 1: Identify your partnership or S corporation
C
Write your federal employer identification no. (FEIN).
A
6 6 6
Write your complete legal business name.
If you have a name change, check this box.
D
Check the box that identifies the return you filed.
Name:
Form IL-1065
Form IL-1120-ST
B
Write your mailing address.
E
Check the applicable box for the type of change being
If you have an address change, check this box.
made.
State change
Federal change
C/O:
If a federal change, check one:
Mailing address:
Partial agreed
Finalized
City:
State:
ZIP:
Write the finalization date
Attach your federal finalization to this return.
F
Check this box if any partners or shareholders included
are trust members.
G
Check this box if the partners or shareholders included
are individuals and/or estate members only.
Step 2: Explain the changes on this return
Step 3: Figure your income and net income tax
A
B
As most recently
Corrected
reported or adjusted
amount
1 a
1a
1a
Modified base income of the partnership or subchapter S corporation.
00
00
b
Total percentage of ownership for resident members.
1b
1b
(Write the percentage as a decimal and carry to six decimal places).
c
1c
1c
Multiply Line 1a by Line 1b.
00
00
2 a
2a
2a
Modified base income allocable to Illinois.
00
00
b
Total percentage of ownership for nonresident members.
2b
2b
(Write the percentage as a decimal and carry to six decimal places).
c
2c
2c
Multiply Line 2a by Line 2b.
00
00
3
3
3
Add Lines 1c and 2c. This amount is your income.
00
00
4
4
4
Income tax. Multiply Line 3 by 5% (.05).
00
00
5
5
5
Recapture of investment credits (Schedule 4255).
00
00
6
6
6
Income tax before investment credits. Add Lines 4 and 5.
00
00
7
7
7
Income tax credits (Schedule 1299-A). See instructions.
00
00
8
8
8
Net income tax. Subtract Line 7 from Line 6.
00
00
This form is authorized as outlined by the Illinois Income Tax Act. Disclosure of this
IL-1023-C-X front (R-12/12)
information is REQUIRED. Failure to provide information could result in a penalty.