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      Illinois Department of Revenue                                                 Use for tax years ending on or 
                                                                                     after December 31, 2022, and 
                                                                                     before December 31, 2023.
      IL-1120-ST-X Instructions                                                                                            2022
                                              General Information
Who must file Form IL-1120-ST-X?                                        • an IRS account transcript; or
You should file Form IL-1120-ST-X if you are amending a previously      • a federal refund check.
filed, processable Form IL-1120-ST, Small Business Corporation                 Acknowledgement that the IRS received your amended 
Replacement Tax Return, for a tax year ending on or after               return is not acceptable proof of federal finalization.
December 31, 2006. Your change can occur from a state or federal        If your federal change decreases the tax due to Illinois and 
change that affects items used to compute your Illinois net income,     you are entitled to a refund or credit carryforward, you must file 
net loss, or credits, such as                                           Form IL-1120-ST-X within two years plus 120 days of federal 
• an amendment of your federal income tax return,                       finalization.
• an adjustment made by the Internal Revenue Service (IRS),             If your federal change increases the tax due to Illinois, you must file 
  or                                                                    Form IL-1120-ST-X and pay any additional tax within 120 days of 
• any other recomputation or redetermination.                           IRS partial agreement or finalization, in order to avoid late payment 
A separate amended return must be filed for each tax year you need      penalties. You must attach proof of the federal finalization date, 
to amend.                                                               showing the change was reported to Illinois within 120 days of IRS 
                                                                        acceptance, or you may be assessed a late-payment penalty.
What if I need to change my return before the                                  If you fail to notify us of your change by filing Form 
extended due date expires?                                              IL-1120-ST-X, we may issue a notice of deficiency at any time. Once 
                                                                        you file your change, we may issue a notice of deficiency within two 
If you filed your original Form IL-1120-ST and a state or federal       years.
correction or change needs to be made before the extended due 
date expires (see the instructions of your original return), you should What if I am amending my return due to multiple 
file Form IL-1120-ST-X. Due to the automatic extension, any return      federal adjustments?
filed after the original return and on or before the extended due date 
                                                                        If you are amending your original Form IL-1120-ST due to multiple 
will be treated as the original return.
                                                                        federal adjustments that were finalized on different dates, then 
If you are filing Form IL-1120-ST-X to change the election on your      you must complete separate amended Illinois returns for each 
original return to treat all income other than compensation as          federal finalization date. For example, if you receive a 2022 return 
business income, check the box in Step 1, Line R, and provide a         adjustment from the IRS on July 10, 2023, and in August 2023, you 
written explanation indicating the change to your election in the       amend your U.S. Form 1120-S and receive federal finalization on 
“Explain the changes on this return” area.                              October 22, 2023, then you must submit one Form IL-1120-ST-X for 
                                                                        the July 10, 2023, adjustments and a separate Form IL-1120-ST-X 
How long do I have to amend my return?
                                                                        for the October 22, 2023, adjustments. Failure to file separate 
The amount of time you have to amend your return depends on             amended returns for each federal finalization date may result in the 
whether your Form IL-1120-ST-X is being filed to report a state or      denial of the entire claim, a delay in processing, or the assessment of 
federal change.                                                         penalty and interest. 
       If an amended return claiming a credit or refund is filed 
                                                                        What if my amended return involves unitary 
within six months of the expiration of the statute of limitations, then 
the statute of limitations will automatically be extended an additional filing?
six months for issuing an assessment of additional tax due.             If you are amending your original
State change - If your change creates or increases the Illinois net     • non-unitary Form IL-1120-ST to be included in an existing 
loss for the year, you must file Form IL-1120-ST-X showing the            unitary group, you must file an amended Form IL-1120-ST-X, 
increase in order to carry the increased loss amount to another year.     following the line by line instructions provided for 
                                                                          Form IL-1120-ST, Schedule UB, Combined Apportionment for 
If your change decreases the tax due to Illinois and you are entitled 
                                                                          Unitary Business Groups, and Subgroup Schedule, for the tax 
to a refund or credit carryforward, you must file Form IL-1120-ST-X 
                                                                          year you are amending. In addition,
within
                                                                          —  any combined return filed by the combined group on 
•   three years after the due date of the return (including 
                                                                               Form IL-1120 must also be amended to include your 
  extensions),
                                                                               information, and
• three years after the date your original return was filed, or
                                                                          —  each member that filed a separate unitary return must file 
• one year after the date your Illinois tax was paid, whichever 
                                                                               an amended return to include your information.
  is latest.
                                                                        • unitary Form IL-1120-ST to report a state or federal change to 
If your change increases the tax due to Illinois, you should file 
                                                                          your unitary income, any combined return filed by the group or 
Form IL-1120-ST-X and pay the tax, penalty, and interest promptly.
                                                                          separate unitary return may also need to be amended.
Federal change - Do not file this amended return until you 
receive a federal finalization notification from the IRS stating that   What if my amended return involves an Illinois 
they have accepted your change, either by paying a refund, or by 
                                                                        net loss deduction (NLD)?
final assessment, agreement, or judgment. In order to process an 
amended return due to a federal change, the Illinois Department of      If you have an Illinois NLD carryover from any loss year ending on 
Revenue (IDOR) requires federal finalization notification. The federal  or after December 31, 1986, it is subtracted from and limited to base 
finalization notification includes one or more of the following:        income allocable to Illinois.
                                                                        To determine your “Illinois net loss” start with your total unmodified 
• a copy of your federal audit report (signed and dated by a federal    base income and apply all addition and subtraction modifications, 
  auditor);                                                             and all allocation and apportionment provisions.
IL-1120-ST-X Instructions (R-12/22)        Printed by the authority of the State of Illinois. - web only - one copy.           Page 1 of 6

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If you are carrying an Illinois NLD, you must complete and attach What must I attach to my Form IL-1120-ST-X?
Illinois Schedule NLD, Illinois Net Loss Deduction, and claim the This form must contain a complete explanation of the reasons
deduction on Step 7, Line 50. See Specific Instructions for Step 7, for filing the claim or amendment. You must attach proof of the
Line 50. federal finalization date and any schedules, forms, breakdowns,
Federal finalization notification must be attached to your statements, or other documentation required to support your claim.
amended return before the return will be processed. If Form IL-1120-ST-X is submitted without the proper attachments, it
Do not file Form IL-1120-ST-X to report an Illinois NLD carryforward may be partially or totally denied.
until after you have filed the loss year Form IL-1120-ST, Examples of federal finalization include a copy of one or more of the
Form IL-1120-ST-X, or Form IL-843 (for tax years ending following items:
prior to December 31, 2006) reporting the loss. When you • your audit report from the IRS
file Form IL-1120-ST-X, you must attach a completed Illinois • your federal record of account verifying your ordinary business
Schedule NLD. Failure to attach the correct and completed schedule income
could result in partial or total denial of your claim.
If you need more information, visit our website at tax.illinois.gov If you are filing Form IL-1120-ST-X because
and see the Schedule NLD instructions, or 86 Ill. Adm Code Sections • you filed an amended federal return and your tax due to Illinois
100.2050 and 100.2300 through 100.2330. decreases, you must attach proof of the federal finalization
date, a copy of that federal return, plus any other related forms,
Who should sign the return? schedules, or attachments, including a signed and dated copy
Your Form IL-1120-ST-X must be signed by the president, vice of any federal report of income tax examination changes, if
president, treasurer, or any other officer duly authorized to sign the applicable.
return. If you paid someone (other than a regular, full-time employee • you filed an amended federal return and your tax due to Illinois
of the taxpayer, such as a clerk, secretary, or bookkeeper) to prepare increases, you must attach proof of the federal finalization
your return, that individual must also provide a signature, date the date, including a signed and dated copy of any federal report
return, enter the preparer tax identification number (PTIN) issued to of income tax examination changes, if applicable, showing
them by the Internal Revenue Service, and provide their firm’s name, the change was reported to Illinois within 120 days of IRS
federal employer identification number (FEIN), address, and phone acceptance, or you may be assessed a late-payment penalty.
number. • of a change by the IRS, you must include all copies of the federal
examining officer’s reports, including preliminary, revised,
Can a reasonable facsimile be used? corrected, and superseding reports, and a signed and dated
In general, you must obtain and use forms prescribed by IDOR. copy of any federal report of income tax examination changes, if
Separate statements not on forms provided or approved by applicable.
IDOR will not be accepted and you will be asked for appropriate • you copied information incorrectly from your U.S. Form 1120S
documentation. Failure to comply with this requirement may onto your Form IL-1120-ST, you must include a copy of your
result in failure to file penalties, a delay in the processing of U.S. Form 1120S.
your return, or a delay in the generation of any overpayment. • of a change in, or audit of, another state’s tax return, you must
Additionally, failure to submit appropriate documentation when include a copy of the other state’s corrected return or the
requested may result in a referral to our Audit Bureau for compliance examining officer’s reports.
action.
• of a change in the information reported on your Schedule B,
S corporations must complete Form IL-1120-ST-X. Do not send Partners’ or Shareholders’ Information, you must include a
a computer printout with line numbers and dollar amounts attached corrected Illinois Schedule B.
to a blank copy of the return. Computer generated printouts are
not acceptable, even if they are in the same format as IDOR forms. • of changes reported on a revised Schedule K-1-P or K-1-T (or
Computer generated forms from an IDOR-approved software any equivalent document) you received, you must include a
developer are acceptable. copy of the revised Schedule(s) K-1-P or K-1-T (or equivalent
document). Do not attach copies of Schedule(s) K-1-P you
What are the penalties and interest? issued and which lists your name and federal employer
Penalties — You will owe identification number (FEIN) in Step 1 of Schedule K-1-P.
• a late-filing penalty if you do not file a processable return by the • of changes, other than those described above, see Form
extended due date; IL-1120-ST Instructions and any schedules for the year you are
changing to determine what attachments you must provide.
• a late-payment penalty if you do not pay the tax you owe by the
original due date of the return; Should I round?
• a late-payment penalty for underpayment of estimated tax if you You must round the dollar amounts on Form IL-1120-ST-X to whole
were required to make estimated tax payments and failed to do dollar amounts. To do this, you should drop any amount less than
so, or failed to pay the required amount by the payment due date; 50 cents and increase any amount of 50 cents or more to the next
• a bad check penalty if your remittance is not honored by your higher dollar.
financial institution;
Where should I file?
• a cost of collection fee if you do not pay the amount you owe
Mail your Form IL-1120-ST-X to:
within 30 days of the date printed on your bill.
ILLINOIS DEPARTMENT OF REVENUE
Interest — The interest rate is the federal underpayment rate, which PO BOX 19016
is set by the IRS under Internal Revenue Code (IRC) Section 6621. SPRINGFIELD IL 62794-9016
For more information about penalties and interest, see
Publication 103, Penalties and Interest for Illinois Taxes, available at
tax.illinois.gov.

Page 2 of 6 IL-1120-ST-X Instructions (R-12/22)

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What if I need additional assistance or forms? • Visit a taxpayer assistance office - 8:00 a.m. to 5:00 p.m.
• Visit our website at tax.illinois.gov for assistance, forms or (Springfield office) and 8:30 a.m. to 5:00 p.m. (all other offices),
schedules. Monday through Friday.
• Write us at:
ILLINOIS DEPARTMENT OF REVENUE
PO BOX 19001
SPRINGFIELD IL 62794-9001
• Call 1 800 732-8866 or 217 782-3336 (TDD, telecommunications
device for the deaf, at 1 800 544-5304).

Specific Instructions

For instructions regarding completion of Steps 1 through 9, refer to J — Check this box if you are filing this amended return to report
the Form IL-1120-ST Instructions and schedules for the year being changes to your Illinois sales factor numerator due to the inclusion or
amended. exclusion of throwback sales.
Specific instructions for most of the lines are included. If a specific K — Check this box if you are filing this amended return to report
line is not referenced, follow the instructions on the form. changes to your Illinois sales factor numerator due to the inclusion or
Enter the tax year you are amending in the space provided at the top exclusion of double throwback sales.
of Form IL-1120-ST-X. L — Check this box if you are a 52/53 week filer. A 52/53 week
filer is a fiscal filer with a tax year that varies from 52 to 53 weeks
Step 1: Identify your small business because their tax year ends on the same day of the week instead
corporation of the last day of the month.
A — Type or print your legal business name. If you have a name M — Check this box if you elect to pay PTE tax in an amount equal
change from your original return, check the corresponding box. to 4.95 percent (0.0495) of the taxpayer’s calculated net income for
B — Type or print your mailing address. If your address has changed the taxable year on Line 61.
since you filed your last return, check the box. N — Enter your entire federal employer identification number (FEIN).
C — Check the box if you are filing this form only to report an O — If you are a member of a unitary business group, check the
increased net loss, you have no surcharges for Compassionate Use box and enter the entire FEIN of the member who prepared Illinois
of Medical Cannabis Program Act or sale of assets by gaming licensee, Schedule UB. Attach Schedule UB to the return.
or pass-through withholding or PTE tax payments on your original P — Enter your North American Industry Classification System
or amended return, and no overpayment will result. Complete Steps (NAICS) Code. If you are unsure of your code, you can research the
2 through 5, Step 6, if applicable, and Step 7, Lines 47 through 50. information at www.census.gov/naics/ or www.irs.gov.
Sign the return in Step 10 and leave the rest of the form blank.
Q — Enter your Illinois corporate file (charter) number provided to
D — You must check the box and attach Form IL-4562, Special you by the Secretary of State.
Depreciation, if you are claiming special depreciation addition or
R — If you are filing Form IL-1120-ST-X on or before the extended
subtraction modifications on Form IL-1120-ST-X, even if the amounts
due date and wish to make the election to treat all income, other
are not changing from your original return.
than compensation, as business income for this tax year, check
E — You must check the box and attach Schedule M, Other this box. If you previously reported nonbusiness income on
Additions and Subtractions (for businesses), if you are claiming other Form IL-1120-ST, Step 6, Lines 36 and 44, you must reduce these
addition or subtraction modifications on Form IL-1120-ST-X, even if amounts to zero on this Form IL-1120-ST-X. This election must
the amounts are not changing from your original return. be made by the extended due date of the original tax return. Once
F — You must check the box and attach Schedule 80/20, made, the election is irrevocable. If you are filing Form IL-1120-ST-X
Related-Party Expenses, if you are claiming related-party expenses after the extended due date of the original return and did not make
modifications on your Form IL-1120-ST-X, even if the amounts are the election on your original return, you cannot check this box.
not changing from your original return. S — If you have completed U.S. Form 8886 or U.S. Schedule M-3,
G — Check the box if you are claiming deductions or credits listed Part II, Line 10, to report a tax shelter and you did not attach a
on Illinois Schedule 1299-A, Tax Subtractions and Credits (for copy to the original return, check the appropriate box and attach a
partnerships and S corporations). You must check the box and copy of the federal form or schedule to this return. If you are filing
attach Illinois Schedule 1299-A and any other required support listed this return because of changes associated with U.S. Form 8886 or
on Schedule 1299-A to your tax return to support any deductions or U.S. Schedule M-3, Part II, Line 10, provide a detailed explanation in
credits you are claiming or passing to your shareholders. the “Explain the changes on this return” area.
H — If you are attaching Subgroup Schedule to your Schedule UB, T — Check the box if you must adjust loss or loss carryover due
Combined Apportionment for Unitary Business Group check the box. to discharge of indebtedness. For more information, see the
See Subgroup Schedule Instructions and Schedule UB Instructions Form IL-1120-ST, Step 7, Line 48 instructions and Schedule NLD
for more information. instructions.
I — Check the appropriate box for the reason you are filing U — If your business activity is protected under Public Law 86-272,
this return. If you are amending due to a federal change, you check this box and complete Steps 1 through 7 of your IL-1120-ST-X.
must check the appropriate box for partial agreed or finalized and V — Check this box if you are paying Pass-through Entity (PTE) Tax
include the date of IRS finalization, which might not be the date the and you annualized your income on Form IL-2220, Computation of
federal amended return was filed. Attach a dated copy of any federal Penalties for Businesses. Attach Form IL-2220.
examining officer’s report. If you do not provide this date or the
required attachments, you may be assessed penalties and interest.
IL-1120-ST-X Instructions (R-12/22) Page 3 of 6

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If you need to make a correction to Line 20 or Line 24,
Explain the changes on this return use the worksheet located in the Schedule B Instructions of the
This area allows you to explain what specific changes you are Form IL-1120-ST Instructions to figure the correct amounts. You
making to your Illinois tax return. You should include all relevant must attach a corrected Illinois Schedule B if there is a change
information, including, but not limited to, changes made to in the information reported on your most recently filed Illinois
• specific addition and subtraction modifications, Schedule B.
• unitary membership or unitary status, Line 35 — This is your base income or loss.
• the business income election, Column A — Enter the amounts from your most recently filed or
• credit or credit recapture amounts, adjusted return. Do not check a box on Lines A or B to indicate
• the Illinois net operating loss deduction, and how your income was reported on your most recently filed or
• the federal or other state return that caused changes to the adjusted return. The check boxes on Lines A and B are used when
Illinois return. reporting your amended base income or loss in column B.
You must provide an explanation for each line item you change. Column B — Follow the instructions on the form and check the
If your changes generate an overpayment which you elect to receive box on Line A or B that applies to the amount in Column B. You must
as a credit carryforward and you elect to apply that credit to a tax check one of these boxes and follow the instructions for that line
year other than the year described in the Line 70 instructions, you when completing Column B.
must follow the instructions found under “May I apply my credit to a Check the box on Line A if
different tax year?” If you fail to include the required information in • all of your base income or loss is derived inside Illinois; and
your explanation, your election will be considered invalid and we will • you do not have any income or loss to report on Lines 36, 37,
not apply your credit as you requested. 44, or 45.
If you check the box on Line A, do not complete Step 6,
General Information for Steps 2 through 9
Column B. All of your amended base income or loss is allocable
Column A — Enter the amounts from your most recently filed or to Illinois. Skip Step 6, Column B, enter the amount from Step 5,
adjusted return for the year that you are amending. These may be Column B, Line 35 on Step 7, Column B, Line 47, and complete the
figures from your original Form IL-1120-ST, or a previously amended remainder of the return.
or audited return.
Check the box on Line B if any of the following apply:
Column B — Enter the correct amount for each line in Column B. • your base income or loss is derived inside and outside Illinois;
For each line item you change, you must provide an explanation of
• all of your base income or loss is derived outside Illinois; or
the change in the “Explain the changes on this return” area of your
return. • you have income or loss to report on Lines 36, 37, 44, or 45.
For instructions regarding completion of Steps 2 through 9, refer to If you check the box on Line B, you must complete all lines
the Form IL-1120-ST Instructions and schedules for the year being of Step 6, Column B. Submitting Form IL-1120-ST-X with an
amended. incomplete Step 6, Column B, including Lines 40, 41, and 42 may
result in a delay in processing your return, further correspondence,
If you are filing this form only to report an increase in your
and you may be required to submit further information to support
Illinois net loss, you have no surcharges for Compassionate Use of
your filing. See the Specific Instructions for Step 6 for more
Medical Cannabis Program Act or sale of assets by gaming licensee
information.
or pass-through withholding payments to report on behalf of your
members on your original or amended return, and the change will not Unitary filers - You must complete both Step 4 of the
result in an overpayment, see the instructions for Step 7, Line 47. Schedule UB and Step 6, Column B of the Form IL-1120-ST-X.
Step 2 and Step 3: Figure your ordinary income Step 6: Figure your income allocable to Illinois
Complete Step 6 only if you originally completed this step, or you
or loss and Figure your unmodified base need to make a change that affects your base income or loss
income or loss allocable to Illinois. Refer to Form IL-1120-ST, Step 6, Specific
If you are a member of a unitary group see “What if I am a Instructions, for the year being amended.
member of a unitary group?“ and the instructions for Steps 2 and 3 in You must check the box on Line B and complete Step 6 if any
the Form IL-1120-ST instructions. portion of Step 5, Column B, Line 35, base income or loss, is
Lines 1 through 13 — Refer to your Form IL-1120-ST, derived outside Illinois, or you have any income or loss to report on
Steps 2 and 3, Specific Instructions, for the year being amended. Column B, Lines 36, 37, 44, or 45.
Do not apply your Illinois net loss deduction (NLD) amount in If you do not complete all of Step 6, Column B, Lines 36 through 46,
this step. NLDs are reported on Step 7, Line 50. we may issue a notice and demand proposing 100 percent of income
as being allocated to Illinois, or in the case of a loss return, a notice
Step 4 and Step 5: Figure your income or loss indicating none of your loss as being allocated to Illinois.
and Figure your Illinois base income or loss Lines 36 and 44 — If you elected to treat all of your income other
If you are a member of a unitary group see “What if I am a than compensation as business income on your original tax return,
member of a unitary group?“ and the instructions for Step 4 in the you must follow that election by entering zero on Form IL-1120-ST-X,
Form IL-1120-ST instructions. Lines 36 and 44. If you are filing Form IL-1120-ST-X before
Line 14 — If you are a member of a unitary group enter your the extended due date and are making the election to treat all
combined company income as shown on Schedule UB, Step 2, nonbusiness income as business income, Column B, Lines 36 and
Column E, Line 30. Otherwise, follow the instructions on the form. 44 should be reduced to zero.
Lines 15 through 21 and Lines 23 through 33 — List each
item and the amount on the line provided. You must identify all
subtractions and attach all of the required supporting documentation.

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Step 7: Figure your net income Pass-through withholding payment amounts reported to you are
included on Step 9, Line 63c.
Line 47 — Follow the instructions on the form. If the amount
in Column A reflects income and the corrected amount in You must also issue revised Schedule(s) K-1-P to your
Column B reflects a loss, you may be able to carry this loss to shareholders if any amounts reported to them on the original
other years as an Illinois NLD. See the instructions for Illinois Schedule(s) K-1-P you issued have changed. Mark the top of the
Schedule NLD for more information. revised Schedule(s) K-1-P you issue as “Revised.”
If you are filing this form only to report an increase in your Line 60 — Complete this line if you elect to pay PTE tax on your
Illinois net loss, you have no surcharges for Compassionate Use of calculated base income instead of pass-through withholding. Follow
Medical Cannabis Program Act or sale of assets by gaming licensee, or the instructions on Form IL-1120-ST, Line 60.
pass-through withholding or PTE tax payments on your original or Line 61 — If you complete Line 61, then Line 59 should be blank.
amended return, and the change will not result in an overpayment,
check the box in Step 1, Line C, complete Steps 2 through 5, Step 6, Step 9: Figure your refund or balance due
if applicable, and Step 7, Lines 47 through 50. Complete the “Explain If you are filing this form only to report an increase in your
the changes on this return” area stating what caused the increase in Illinois net loss, you have no surcharges for Compassionate Use of
the Illinois net loss and sign the return in Step 10. Leave the rest of Medical Cannabis Program Act or sale of assets by gaming licensee
the form blank. or pass-through withholding payments to report on behalf of your
members on your original or amended return, and an overpayment
Line 48 — If the amount on Line 47 is a loss, and you were
will not result, do not complete this step.
required to reduce the net operating loss reported on your U.S.
Form 1120S because you excluded any discharge of indebtedness Line 63a — Enter the sum of any overpayment from your prior
income from this tax year’s gross income, then you may be required year tax returns that you requested to be applied to this year’s tax
to reduce the net loss reported on Line 47. Use the Loss Reduction return. Take into account any correspondence we may have sent
Worksheet on Page 10 in the Form IL-1120-ST instructions to you that changed the amount of your credit carryforward from the
figure your loss reduction. Attach a copy of your U.S. Form 982, previous year.
Reduction of Tax Attributes Due to Discharge of Indebtedness, Line 63b — Enter the sum of the following, not including any
to your Form IL-1120-ST-X. For more information, see 86 Ill. Adm. penalty and interest previously paid:
Code Section 100.2310(c). • estimated payments or tax prepayments made during the tax
Line 49 — If you have a discharge of indebtedness adjustment year,
on Line 48, add Line 47 (a negative number) and Line 48 (a positive • extension payments,
number), and enter the result here. This amount cannot be greater • any tax payments you made with a previously filed
than zero. Form IL-1120-ST-X, and
If you do not have a discharge of indebtedness adjustment, • any other payments made prior to the date this amended return
enter zero on Line 48 and the amount from Line 47 on Line 49. is filed (e.g., responding to a bill).
Line 50 — Enter your Illinois NLD from the Illinois Schedule NLD, Line 63c — Enter the amount you wish to claim of Illinois
Step 1, Line 7 total box. Attach Illinois Schedule NLD to your pass-through withholding payments reported to you by partnerships,
Form IL-1120-ST-X. S corporations, or trusts on Schedule(s) K-1-P or K-1-T. If you
received more than one Schedule K-1-P or K-1-T, add the amounts
Step 8: Figure the taxes, surcharges, and
you wish to claim from all the schedules and enter the total here.
pass-through withholding you owe Attach copies of the Schedules K-1-P and K-1-T you received
Follow the instructions on the form. Be sure to attach any required from the pass-through entities to your Form IL-1120-ST-X. See
schedules or forms. “Definitions to help you complete your Form IL-1120-ST” in the
Line 53 — See Illinois Schedule 4255, Recapture of Investment Form IL-1120-ST instructions for more information.
Credits, for more information. You must attach Illinois Schedule 4255 Do not include on Line 63c any pass-through withholding
if you have an amount on this line. payments you owe on behalf of your members. Pass-through
Line 55 — See Form IL-477, Replacement Tax Investment Credits, withholding payments you owe on behalf of your members are
for more information. You must attach Form IL-477 and any other included on Step 8, Line 59.
required support listed on Form IL-477 if you have an amount on this Line 63d — Enter the amount of any Illinois gambling and sports
line. wagering winnings withholding shown on Form W-2G. Attach
Line 57 — Compassionate Use of Medical Cannabis Program Act Form W-2G.
surcharge. Use the instructions and the Surcharge Worksheet in the Line 65 — Enter previously paid penalty and interest. This
Form IL-1120-ST instructions to figure your surcharge. information can be obtained from your MyTax Illinois account. Sign
Line 58 — Sale of assets by gaming licensee surcharge. Use the into mytax.illinois.gov to view or register your account.
instructions and the Surcharge Worksheet in the Form IL-1120-ST Line 66 — Enter the total amount of any overpayment, credit, or
instructions to figure your surcharge. refund (whether or not you received the overpayment) reported on
Line 59 — Complete all sections of Illinois Schedule B and enter your previously filed Form IL-1120-ST, or Form IL-1120-ST-X. Do not
the amount from Illinois Schedule B, Section A, Line 5 on this line. include any interest that you received.
This is the amount of pass-through withholding payments you owe Line 70 — Enter the amount of overpayment you elect to be
on behalf of your members. You must attach a corrected Illinois credited forward. Check the box on this line if this is your final return
Schedule B if there is a change in the information reported on and any remaining carryforward is being transferred to another
your most recently filed Illinois Schedule B. See “Definitions to entity. Attach a detailed statement to your return listing the FEIN of
help you complete your Form IL-1120-ST” in the Form IL-1120-ST the entity receiving the credit carryforward, the date the credit was
instructions for more information. transferred, and the reason for the transfer.
Do not include on Line 59 any pass-through withholding See Form IL-1120-ST, Step 9, Line 68 instructions for more
payments reported to you on Schedule(s) K-1-P or K-1-T. information.

IL-1120-ST-X Instructions (R-12/22) Page 5 of 6

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Your credit carryforward will not be applied if you do not file a           Step 10:  Signature, date, and paid preparer’s 
processable return.                                                         information
If your overpayment accrues interest and you elect to receive your          You must sign and date your return. If you do not sign your return, 
• entire overpayment as a credit carryforward, any interest due will        it will not be considered filed and you may be subject to a nonfiler 
  be applied with your credit as an additional credit carryforward.         penalty.
  We will calculate the amount of interest due and notify you.              If you pay someone to prepare your return, the income tax return 
  When you claim your credit carryforward in a future year you              preparer must also sign and date the return, enter the preparer tax 
  must include this interest amount in the amount claimed.                  identification number (PTIN) issued to them by the Internal Revenue 
• overpayment as both a credit carryforward and a refund, we will           Service, and provide their firm’s name, FEIN, address, and phone 
  apply the credit as you request and include any interest due with         number.
  your refund.                                                              If you want to allow the paid preparer listed in this step to discuss 
   Your credit carryforward may be reduced by us due to                     this return with IDOR, check the box. This authorization will allow 
corrections we make to your return, or to satisfy any unpaid tax,           your paid preparer to answer any questions that arise during the 
penalty, and interest due for this year or any other year. If we reduce     processing of your return, call us with questions about your return, 
your credit carryforward, it may result in a late-payment penalty in a      and receive or respond to notices we send. The authorization will 
subsequent year.                                                            automatically end no later than one year after you file your amended 
May I apply my credit to a different tax year?                              return. You may revoke the authorization at any time by calling or 
                                                                            writing us.
Yes. If you wish to apply your credit to a tax year other than the one 
described above, you must indicate the tax year to which you wish to 
have the credit apply in the “Explain the changes on this return”  area 
of this return.
If you do not follow these instructions, your election will be 
considered invalid and we will apply your credit as indicated 
under “To which tax year will my credit apply?” in the original return 
instructions.
If you submit a valid request, we will apply your credit as you requested 
and notify you. Once made, your election to change the tax year to which 
your credit will apply is irrevocable. 
   You may only apply your credit to tax years occurring after 
the year of the return creating the overpayment. If you request to apply 
more credit than our records show you have available, we will apply the 
maximum amount available and notify you of the difference.
Line 71 — Follow the instructions on the form. We will calculate any 
interest that may be due you and include it in your refund check. Any 
refund may be reduced to satisfy any outstanding liability.
We do not currently offer direct deposit as a method for receiving a refund 
from an amended return. Overpayments will be refunded by check.
Line 72 — Follow the instructions on the form. This is your amount 
of tax due that must be paid in full if $1 or more. We encourage you to 
let us figure your penalties and interest and send you a bill instead of 
determining these amounts yourself.   We will compute any penalty and 
interest due and notify you. For more information see “What are the 
penalties and interest?” and Publication 103. 
   We will apply all payments against tax first, penalty second, 
and interest third.
If you have a balance due on Line 72 be sure to enter the amount you 
are paying on the top of Page 1 of the Form IL-1120-ST-X. Complete a 
payment voucher, Form IL-1120-ST-X-V, make your check or money 
order payable to “Illinois Department of Revenue”  , and attach 
them to the front of the return or file and pay electronically.

Page 6 of 6                                                                            IL-1120-ST-X Instructions (R-12/22)

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