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                    ILLINOIS DEPARTMENT OF REVENUE 

                    DRAFT FORM 

Note: The draft you are looking for begins on the next page. 

Caution: DRAFT—NOT FOR FILING 

This is an early release draft of an Illinois Department of Revenue (IDOR) tax form or instructions, which 
IDOR is providing for substitute forms providers. Do not file draft forms and do not rely on draft forms 
and instructions for filing. We incorporate all significant changes to forms posted with this coversheet. 
However, unexpected issues occasionally arise, or legislation is passed—in this case, we will post a new 
draft of the form to alert users that changes were made to the previously posted draft.  

All forms and instructions have a page on our website at Tax Forms (illinois.gov) where you may see the 
final versions once they are released. Year-end income tax forms are usually released towards the end 
of January. 

If you wish, you can submit comments and questions to IDOR about draft or final forms and instructions 
at REV.VendorForms@illinois.gov. We will forward this information to the Office of Publications 
Management, where forms and publications are administered. 

IDR-1-DIS (N-08/23)          Printed by authority of State of Illinois, web only – one copy. 
 



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                                                                          Illinois Department of Revenue                                                     
                                                                                                                                                              *32712231V*
                                                                              2023 Form IL-1120-ST  
                                                                       Small Business Corporation Replacement Tax Return 
                                                                          Due on or before the 15th day of the 3rd month following the close of the tax year. 
   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 small business corporation                                                                                                                           N     Enter your federal employer identification number    
TENTATIVE A                                                Enter your complete legal business name.                                                                             (FEIN).                                            FINAL
                                                           If you have a name change, check this box.                                                                        
                                                           Name:                                                                                                            O         Check this box if you are a member of a                            
  B                                                        Enter your mailing address.                                                                                            unitary business group and enter the FEIN of the    
                                                           C/O:                                                                                                                   member who prepared the Schedule UB, Combined  
                                                                                                                                                                                  Apportionment for Unitary Business Group. 
      Mailing address:                                                                                                                                                             
                                                                                                                                                                                  Attach Schedule UB to this return.
      City:                                                                                                             State:                         ZIP:  
                                                                                                                                                                                                                                                     
   C                                                       If this is the first or final return, check the applicable box(es).                                              P  Enter your North American Industry Classification    
                                                                 First return                                                                                                     System (NAICS) Code. See instructions.  
                                                                Final return (Enter the date of termination.                                                )                
                                                                                                                                      mm    dd     yyyy                     Q     Enter your Illinois corporate file (charter) number    
   D  If this is a final return because you sold this business, enter the date sold                                                                                               issued by the Secretary of State. 
                                                           (mm dd  yyyy)                         , and the new owner’s FEIN                                                  
                                                                                                                        .                                                   R     Enter the city, state, and zip code where your                         
  E                                                        Apportionment Formulas. Check the appropriate box or boxes and see                                                     accounting records are kept. (Use the two-letter                       
                                                           the Apportionment Formula instructions.                                                                                postal abbreviation, e.g., IL, GA, etc.) 
                                                                Financial organizations                               Transportation companies                                                                                                                                                                         
                                                                Federally regulated exchanges                         Sales companies                                             City                                             State        ZIP
  F                                                        Check this box if you attached Form IL-4562.                                                                     S     If you are making   the business                 income election to  
                                                                                                                                                                                    treat all nonbusiness income as business income, 
  G  Check this box if you attached Illinois Schedule M (for businesses).                                                                                                         check this box and enter zero on Lines 36 and 44. 
   H  Check this box if you attached Schedule 80/20.                                                                                                                        T     If you have    completed   the following, check the box  
  I                                                        Check this box if you attached Schedule 1299-A.                                                                          and attach   the federal form(s) to this return.
   J                                                       Check this box if you attached the Subgroup Schedule.                                                                       Federal Form 8886                             Federal Sch. M-3,
                                                                                                                                                                                                                                       Part II, Line 10
   K  Check this box if you are a 52/53 week filer.                                                                                                            
                                                                                                                                                                            U     If you are making a discharge of indebtedness     
   L                                                       Check this box if you elected to file and pay Pass-through                                                             adjustment on Schedule NLD or Form IL-1120-ST, 
                                                           Entity Tax. See instructions.                                                                                          Line 48, check this box and attach federal 
  M  If you are paying Pass-through Entity Tax and you annualized your                                                                                                            Form 982.                                                           
                                                           income on Form IL-2220, check this box and attach Form IL-2220.                                                  V   Check this box if your business activity is                             
                                                                                                                                                                                    protected under Public Law 86-272.                     

      Step 2:  Figure your ordinary income or loss                                                                                                                                                                                 (Whole dollars only)
                                                          1  Ordinary income or loss, or equivalent from federal Schedule K.                                                                                 1                                       00
                                                          2  Net income or loss from all rental real estate activities.                                                                                      2                                       00
                                                          3  Net income or loss from other rental activities.                                                                                                3                                       00
                                                          4  Portfolio income or loss.                                                                                                                       4                                       00
                                                          5  Net IRC Section 1231 gain or loss.                                                                                                              5                                       00
                                                          6  All other items of income or loss that were not included in the computation of income or loss on 
                                                              Page 1 of U.S. Form 1120-S. See instructions. Identify: ______________________________                                                         6                                       00
                                                          7  Add Lines 1 through 6. This is your ordinary income or loss.                                                                                    7                                       00
                                                         Step 3:  Figure your unmodified base income or loss
                                                          8  Charitable contributions.                                                                                                                       8                                       00
                                                          9  Expense deduction under IRC Section 179.                                                                                                        9                                       00
   10  Interest on investment indebtedness.                                                                                                                                                                  10                                      00
   11  All other items of expense that were not deducted in the computation of ordinary income or loss on                                                                                                          
                                                              Page 1 of U.S. Form 1120-S. See instructions.  Identify: ______________________________                                                        11                                      00
   12  Add Lines 8 through 11.                                                                                                                                                                               12                                      00
         Attach your payment and Form IL-1120-ST-V here. 13  Subtract Line 12 from Line 7. This amount is your total unmodified base income or loss.                                                         13                                      00
                                                                                                                                            This form is authorized as outlined by the Illinois Income Tax Act. Disclosure of this 
                                                               IL-1120-ST (R-12/23)     IR NS         DR                                    information is REQUIRED. Failure to provide information could result in a penalty.     Page 1 of 5



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                                                                         *32712232V*

Step 4:  Figure your income or loss 
 14 Enter the amount from Line 13. Unitary filers, enter the amount from Schedule UB, Step 2, Col E, Line 30. 14                               00
 15  State, municipal, and other interest income excluded from Line 14.                                      15                                00
 16  Illinois taxes and surcharge deducted in arriving at Line 14. See instructions.                             16                            00
 17  Illinois Special Depreciation addition. Attach Form IL-4562.                                               17                             00
 18  Related-Party Expenses addition. Attach Schedule 80/20.                                                   18                              00
 19  Distributive share of additions. Attach Schedule(s) K-1-P or K-1-T.                                      19                               00
TENTATIVE FINAL
 20  The amount of loss distributable to a shareholder subject to replacement tax. Attach Schedule B.       20                                 00
 21  Other additions. Attach Illinois Schedule M (for businesses).                                              21                             00
 22  Add Lines 14 through 21. This amount is your income or loss.                                           22                                 00   
                                                                                                                                                      
Step 5:  Figure your base income or loss
 23  Interest income from U.S. Treasury or other exempt federal obligations.          23                   00
 24  Share of income distributable to a shareholder subject to replacement 
     tax. Attach Schedule B.                                                          24                   00
 25 River Edge Redevelopment Zone Dividend subtraction. Attach Schedule 1299-A.  25                        00
 26 River Edge Redevelopment Zone Interest subtraction. Attach Schedule 1299-A.   26                       00
 27  High Impact Business Dividend subtraction. Attach Schedule 1299-A.               27                   00
 28  High Impact Business Interest subtraction. Attach Schedule 1299-A.               28                   00
 29  Contribution subtraction. Attach Schedule 1299-A.                                29                   00
 30  Illinois Special Depreciation subtraction. Attach Form IL-4562.                  30                   00
 31  Related-Party Expenses subtraction. Attach Schedule 80/20.                       31                   00
 32  Distributive share of subtractions. Attach Schedule(s) K-1-P or K-1-T.           32                   00
 33  Other subtractions. Attach Schedule M (for businesses).                          33                   00
 34  Total subtractions. Add Lines 23 through 33.                                                                    34                        00
 35 Base income or loss. Subtract Line 34 from Line 22.                                                              35                        00

        A   If the amount on Line 35 is derived inside Illinois only, check this box and enter the amount from Step 5, Line 35
            on Step 7, Line 47. You may not complete Step 6. (You must leave Step 6, Lines 36 through 46 blank.)                       
                  If you are a unitary filer, do not check this box. Check the box on Line B and complete Step 6.
       
           B  If any portion of the amount on Line 35 is derived outside Illinois, or you are a unitary filer, check this box and                    
                                                                                                                                                     
            complete all lines of Step 6. (Do not leave Lines 40 through 42 blank.) See instructions.                                          

Step 6:  Figure your income allocable to Illinois  (Complete only if you checked the box on Line B, above.)
 36 Nonbusiness income or loss. Attach Schedule NB.                                                                 36                         00
 37  Business income or loss included in Line 35 from non-unitary partnerships, partnerships included on a
     Schedule UB, S corporations, trusts, or estates. See instructions.                                             37                         00
 38 Add Lines 36 and 37.                                                                                            38                         00
 39   Business income or loss. Subtract Line 38 from Line 35.                                                       39                         00
 40  Total sales everywhere. This amount cannot be negative.                             40 
 41  Total sales inside Illinois. This amount cannot be negative.                        41 
 42  Apportionment factor. Divide Line 41 by Line 40. Round to six decimal places.       42 
 43  Business income or loss apportionable to Illinois. Multiply Line 39 by Line 42.                                43                         00
 44  Nonbusiness income or loss allocable to Illinois. Attach Schedule NB.                                          44                         00
 45  Business income or loss apportionable to Illinois from non-unitary partnerships, partnerships included
     on a Schedule UB, S corporations, trusts, or estates. See instructions.                                        45                         00
 46 Base income or loss allocable to Illinois. Add Lines 43 through 45.                                             46                         00

     IL-1120-ST (R-12/23)                                                                                               Page 2 of 5



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                                                                             *32712233V*

Step 7:  Figure your net income
 47  Base income or net loss from Step 5, Line 35, or Step 6, Line 46.                                                                  47                00
 48  Discharge of indebtedness adjustment. Attach federal Form 982. See instructions.                                                   48                00
 49  Adjusted base income or net loss. Add Lines 47 and 48.                                                                             49                00
 50  Illinois net loss deduction. If Line 49 is zero or a negative amount, enter zero. Attach Schedule NLD.                             50                00
     Check this box and attach a detailed statement if you have merged losses.                                                 
 51  Net income. Subtract Line 50 from Line 49.                                                                                         51                00

TENTATIVEStep 8:  Figure the taxes, surcharges, pass-through withholding, and penalty you owe                                                          FINAL
 52  Replacement tax. Multiply Line 51 by 1.5% (.015).                                                                                  52                00
 53  Recapture of investment credits. Attach Schedule 4255.                                                                             53                00
 54  Replacement tax before investment credits. Add Lines 52 and 53.                                                                    54                00
 55  Investment credits. Attach Form IL-477.                                                                                            55                00
 56  Net replacement tax. Subtract Line 55 from Line 54. If the amount is negative, enter zero.                                         56                00
 57  Compassionate Use of Medical Cannabis Program Act surcharge. See instructions.                                                     57                00
 58  Sale of assets by gaming licensee surcharge. See instructions.                                                                     58                00
 59  Pass-through withholding you owe on behalf of your members. Enter the amount from
       Schedule B, Section A, Line 5. See instructions. Attach Schedule B.                                                              59                00
 60  Pass-through entity income. See instructions.                                            60                        00    
 61  Pass-through entity tax. Multiply Line 60 by 4.95% (.0495).                                                                        61                00
 62  Total net replacement tax, surcharges, pass-through withholding, and pass-through entity tax
        you owe. Add Lines 56, 57, 58, 59, and 61.                                                                                      62                00
 63  Underpayment of estimated tax penalty from Form IL-2220. See instructions.                                                         63                00
 64  Total taxes, surcharges, pass-through withholding, and penalty. Add Lines 62 and 63.                                               64                00

Step 9:  Figure your refund or balance due
 65  Payments. See instructions.
       a   Credit from previous overpayments.                                                   65a                           00
       b  Total payments made before the date this return is filed.                             65b                           00
       c  Pass-through withholding reported to you.
          Attach Schedule(s) K-1-P or K-1-T.                                                    65c                           00
       d  Illinois income tax withholding. Attach Form(s) W-2G.                                 65d                           00 
 66  Total payments. Add Lines 65a through 65d.                                                                                         66                00
 67  Overpayment. If Line 66 is greater than Line 64, subtract Line 64 from Line 66.                                                    67                00
 68  Amount to be credited forward. See instructions.                                                                                   68                00 
     Check this box and attach a detailed statement if this carryforward is going to a different FEIN.                         
 69  Refund. Subtract Line 68 from Line 67. This is the amount to be refunded.                                                          69                00
 70  Complete to direct deposit your refund 
     Routing Number                                                       Checking or                 Savings 
       Account Number  
 71  Tax Due. If Line 64 is greater than Line 66 subtract Line 66 from Line 64. This is the amount you owe.                             71                00
                                        Enter the amount of your payment on the top of Page 1 in the space provided.

Step 10:  Sign below - Under penalties of perjury, I state that I have examined this return and, to the best of my knowledge, it is true, correct, and complete.
Sign                                                                                                                                            Check if the Department 
Here                                                                                                  (      )                          may discuss this return with the 
     Signature of authorized officer      Date (mm/dd/yyyy) Title                                    Phone                              paid preparer shown in this step.
                                                                                                                                      Check if  
Paid      Print/Type paid preparer’s name          Paid preparer’s signature                            Date (mm/dd/yyyy)      self-employed    Paid Preparer’s PTIN
Preparer
          Firm’s name                                                                                                  Firm’s FEIN
Use Only
          Firm’s address                                                                                               Firm’s phone            (      )
          If a payment is enclosed, mail your Form IL-1120-ST to:        If a payment is not enclosed, mail your Form IL-1120-ST to:          
                Illinois Department of Revenue                                                Illinois Department of Revenue
                P.O. Box 19053                                                                 P.O. Box 19032
                Springfield, IL  62794-9053                                                     Springfield, IL  62794-9032
       IL-1120-ST (R-12/23)            Printed by the authority of the state of Illinois - electronic only - one copy.                         Page 3 of 5



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                   Illinois Department of Revenue                                                                                      Year ending
                                                                  *30812231V*
                   2023 Schedule B 
               Partners’ or Shareholders’ Information                                                                                                          Month      Year
                   Attach to your Form IL-1065 or Form IL-1120-ST.                                                                                             IL Attachment No. 1
                                                                                                                             
Enter your name as shown on your Form IL-1065 or Form IL-1120-ST.                                    Enter your federal employer identification number (FEIN).
Read this information first
       You must read the Schedule B instructions and complete Schedule(s) K-1-P and Schedule(s) K-1-P(3) before completing this 
TENTATIVE FINAL
         schedule. 
       You must complete Section B of Schedule B and provide all the required information for your partners or shareholders before 
         completing Section A of Schedule B. 
        Failure to follow these instructions may delay the processing of your return or result in you receiving further correspondence from 
         the Illinois Department of Revenue. You may also be required to submit further information to support your filing.
Section A:  Total members’ information (from Schedule(s) K-1-P and Schedule B, Section B)
                  Before completing this section you must first complete Schedule(s) K-1-P, Schedule(s) K-1-P(3) and Schedule B, Section B. You               
                 will use the amounts from those schedules when completing this section.

Totals for resident and nonresident partners or shareholders (from Schedule(s) K-1-P and Schedule B, Section B)
1  Enter the total of all nonbusiness income or loss you reported on Schedule(s) K-1-P for your members. 
   See instructions.                                                                                                                                      1   

2  Enter the total of all income and replacement tax credits you reported on Schedule(s) K-1-P for your 
   members. See instructions.                                                                                                                             2    

3  Add the amounts shown on Schedule B, Section B, Line E for all partners or shareholders on all 
   pages for which you have checked the box indicating the entity is subject to Illinois replacement tax 
   or an ESOP. Enter the total here. See instructions.                                                                                                    3    

Totals for nonresident partners or shareholders only (from Schedule B, Section B)
4  Enter the total pass-through withholding you reported on all pages of your Schedule B, Section B, Line J for your 
    
  a.     nonresident individual members. See instructions.                                                                                                4a 
 
  b.     nonresident estate members. See instructions.                                                                                                    4b 
 
  c.     partnership and S corporation members. See instructions.                                                                                         4c 
 
  d.     nonresident trust members. See instructions.                                                                                                     4d 
 
  e.     C corporation members. See instructions.                                                                                                         4e  

5  Add Line 4a through Line 4e. This is the total pass-through withholding you owe on behalf of all your 
   nonresident partners or shareholders. This amount should match the total amount from Schedule B, 
   Section B, Line J for all nonresident partners or shareholders on all pages. Enter the total here and 
   on Form IL-1065 (Form IL-1065-X), Line 59, or Form IL-1120-ST (Form IL-1120-ST-X), Line 59. 
   See instructions.                                                                                                                                      5  

6  Enter the total pass-through entity tax credit paid on all pages of Schedule B, Section B, Line K.                                                     6 

7  Enter the total pass-through entity tax credit received and distributed on all pages of Schedule B, 
   Section B, Line L.                                                                                                                                     7 
                                                                                                                                                                                                                                                                                              
                   Attach all pages of Schedule B, Section B behind this page.

                                                                  This form is authorized as outlined by the Illinois Income Tax Act. Disclosure of this 
         Schedule B (R-12/23)                                     information is REQUIRED. Failure to provide information could result in a penalty.           Page 4 of 5



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                   Illinois Department of Revenue                      *30812232V*

                2023 Schedule B
             
Enter your name as shown on your Form IL-1065 or Form IL-1120-ST.               Enter your federal employer identification number (FEIN).
 
Section B:  Members’ information (See instructions before completing.)

                               Member 1                                  Member 2                                 Member 3 
TENTATIVE FINAL
 A  Name                                                                                                                            

    C/O                                                                                                                              

    Address 1                                                                                                                        

    Address 2                                                                                                                        

    City                                                                                                                             

    State, ZIP                                                                                                                       

 B  Partner or 
      Shareholder                                                                                                                  

 C  SSN/FEIN                                                                                                                         

 D  Subject to Illinois  
    replacement tax  
    or an ESOP                                                                                                     

 E  Member’s distributable  
    amount of base  
    income or loss                                                                                                                   

 F   Excluded from  
    pass-through  
    withholding                                                                                                                    

 G  Share of Illinois  
    income subject to  
    pass-through  
    withholding                                                                                                   

 H  Pass-through  
    withholding 
    before credits                                                                                                

 I  Distributable  
    share of credits                                                                                                                 

 J  Pass-through  
    withholding  
    amount                                                                                                                           

 K  PTE tax credit  
    paid to 
    members                                                                                                                          

 L  PTE tax credit  
    received and  
    distributed to  
    members                                                                                                                          
    
                                 If you have more members than space provided, attach additional copies of this page as necessary.
         Schedule B (R-12/23)  Printed by the authority of the state of Illinois - electronic only - one copy.    Page 5 of 5






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