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Illinois Department of Revenue
*63512231W*
2023 Form IL-1120
Corporation Income and Replacement Tax Return
See “When should I file?” in the Form IL-1120 instructions for a list of due dates.
If this return is not for calendar year 2023, enter your fiscal tax year here. Enter the amount you are paying.
Tax year beginning 20 , ending 20
month day year month day year
This form is for tax years ending on or after December 31, 2023, and before December 31, 2024.
For all other situations, see instructions to determine the correct form to use. $ _______________________
Step 1: Identify your corporation N Enter your federal employer identification number
(FEIN).
A Enter your complete legal business name.
If you have a name change, check this box.
Name: O If you are a member of a group filing a federal
consolidated return, enter the FEIN of the parent.
B Enter your mailing address.
C/O: __________________________________________________ PEnter your North American Industry Classification
Mailing address: ___________________________________________ System (NAICS) Code. See instructions.
City: State: ZIP:
C If this is the first or final return, check the applicable box(es). Q Enter your corporate file (charter) number
assigned to you by the Secretary of State.
First return
Final return (Enter the date of termination. )
mm dd yyyy R Enter the city, state, and zip code where your
D If this is a final return because you sold this business, enter the date sold accounting records are kept. (Use the two-letter
(mm dd yyyy) , and the new owner’s FEIN. postal abbreviation, e.g., IL, GA, etc.)
E Check the box and see the instructions if your business is a: City State ZIP
Unitary Filer (Combined return) Foreign insurer SIf you are making the business income election
to treat all nonbusiness income as business
F If you completed the following, check the box and attach the federal
income, check this box and enter zero on
form(s) to this return.
Lines 24 and 32.
Federal Form 8886 Federal Schedule M-3,
Part II, Line 12 T Check your method of accounting.
G Apportionment Formulas . Mark the appropriate box or boxes and see Cash Accrual Other
Apportionment Formula instructions. Sales companies U If you are making a discharge of indebtedness
Insurance companies Financial organizations adjustment on Schedules NLD or UB/NLD, or
Form IL-1120, Line 36, check this box and
Transportation companies Federally regulated exchanges
attach federal Form 982.
H Check this box if you attached Illinois Schedule UB. V Check this box if you attached
I Check this box if you attached the Subgroup Schedule. Schedule INL.
J Check this box if you attached Illinois Schedule 1299-D. W If you annualized your income on Form IL-2220,
check this box and attach Form IL-2220.
K Check this box if you attached Form IL-4562.
X Check this box if your business activity is
L Check this box if you attached Illinois Schedule M (for businesses). protected under Public Law 86-272.
M Check this box if you attached Schedule 80/20. Y Check this box if you are a 52/53 week filer.
If you owe tax on Line 67, make an electronic payment at Tax.Illinois.gov. If you must mail your payment, complete a
. payment voucher, Form IL-1120-V. Write your FEIN, tax year ending, and “IL-1120-V” on your check or money order and
make it payable to “Illinois Department of Revenue.” Attach your voucher and payment here.
Enter the amount of your payment on the top of this page in the space provided.
If a payment is not enclosed, mail this return to: If a payment is enclosed, mail this return to:
Attach your payment and ILLINOIS DEPARTMENT OF REVENUE ILLINOIS DEPARTMENT OF REVENUE
Form IL-1120-V here PO BOX 19048 PO BOX 19038
SPRINGFIELD IL 62794-9048 SPRINGFIELD IL 62794-9038
This form is authorized as outlined by the Illinois Income Tax Act. Disclosure of this IR NS DR ____
IL-1120 (R-12/23) information is REQUIRED. Failure to provide information could result in a penalty. Page 1 of 4
