Illinois Department of Revenue

        IL-505-I               Automaticfor IndividualsExtensionFiling Form IL-1040Payment                                                              2023 
What is the purpose of Form IL-505-I? 
The purpose of Form IL-505-I, Automatic Extension Payment, is to provide taxpayers who are unable to file their tax return by the due date a 
means of calculating and remitting their tentative tax liability (including any other taxes you will report on your Form IL-1040) on or before the 
original due date of the return (see "When should I file and pay?").

Who must file Form IL-505-I?
You must file Form IL-505-I if all of the following apply to you:
  you cannot file your tax return by the due date, and
  you will owe a tentative tax (complete the Tax Payment Worksheet on the back of this page to determine this), and
   you submit your payment by paper check or money order (i.e., you do not use any electronic means, such as electronic funds transfer, to  
  make your payment).
If Line 7 of the worksheet shows you owe tentative tax, you must pay the full amount due by the original due date of the return. An extension 
of time to file does not extend the amount of time you have to make your payment.
Do not file Form IL-505-I if:
   after you complete the Tax Payment Worksheet, you find that you do not owe additional tax, or
   you make your extension payment electronically by credit card, electronic funds transfer (EFT), or bank account debit.   
Note: If an unpaid liability is disclosed when you file your return, you may owe penalty and interest charges in addition to the tax. See “Will I 
owe penalties and interest?”

What are the extensions?
Automatic Illinois six-month extension 
We automatically grant you a six-month  extension of time to file your tax return.  For calendar year filers, the filing date is automatically 
extended to October 15. You are not required to file Form IL-505-I to obtain this automatic extension. However, you must pay any tentative tax 
due by the original due date of your return in order to avoid any late-payment penalty and interest on unpaid tax.
Additional extension beyond six months 
If you cannot file your tax return within the automatic six-month extension period, we will grant you an extension of more than six months to 
file only if the Internal Revenue Service (IRS) grants you an additional extension. 

When should I file and pay?
If you owe any tentative tax, and you pay with a paper check or money order, file Form IL-505-I along with your payment on or before the 
original due date of your annual return, or as soon as you realize you owe tentative tax.

Where should I file?
Mail your Form IL-505-I to: Illinois Department of Revenue, P.O. Box 19005, Springfield, Illinois 62794-9005. Make your check or money 
order payable to “Illinois Department of Revenue.” 
Be sure to write your Social Security number, tax year, and “IL-505-I” on your payment.

Will I owe penalties and interest?
You will owe a 
  late-filing penalty if you do not file a processable return by the extended due date, 
  late-payment penalty if you do not pay the tax you owe by the original due date of the return, and 
  bad check penaltyif your remittance is not honored by your financial institution. 
You will owe interest on tax from the day after the original due date of your return through the date you pay the tax. We will bill you for 
penalties and interest. 
For more information about penalties and interest, see  Publication 103, Penalties and Interest for Illinois Taxes. To receive a copy of this 
publication, see "What if I need additional forms or assistance?" 

What should I attach to my Form IL-1040?
If you file your return within the automatic six-month extension period, do not   attach anything to your return to explain your delayed filing.
If you file your return after the automatic six-month extension period and the IRS grants you an extension of more than six months, you must 
attach a copy of the document granting your federal extension to your tax return to avoid a late-filing penalty.

Note: Be sure to claim any Form IL-505-I payments on your 2023 Form IL-1040, Line 26. 

IL-505-I (R-12/23)                                           This form is authorized as outlined under the Illinois Income Tax Act.  Disclosure of 
Printed by authority of the State of Illinois, web only, 1.  this information is required.  Failure to provide information could result in a penalty.                                            Page 1 of 3

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

What if I want to pay electronically?
Use one of the following electronic payment options:
•    Online – Visit our website at mytax.illinois.gov to have your payment taken from your checking or savings account. You will              
     need your IL-PIN (Illinois Personal Identification Number). 
•    Credit Card   – Use your MasterCard, Discover, American Express, or Visa. The credit card service provider will assess a convenience   
     fee. Have your credit card ready and visit our website or call one of the following:
      ACI Payments, Inc.  athttps://tax.illinois.gov/individuals/pay/aci.html    or by phone at 1 833 747-1434. 
      payILtax at https://www.paystatetax.com/IL or pay by phone at 1 888 877-0450. 
      Link2Gov/FIS at https://www.iltaxpayment.com/ or by phone at 1 877 513-5465. 

                                          Instructions for Tax Payment Worksheet 

Line 1 – Income tax and other taxes 
Enter the total amount of individual income tax you expect to owe and any other taxes you will report on your Form IL-1040. Use Form 
IL-1040 as a worksheet and complete Lines 1 through 14 to determine the income tax you expect to owe and Lines 20, 21, and 22 to 
determine any other taxes you will report on your Form IL-1040. Add your expected income tax due and other taxes from Form IL-1040 and 
enter the result here. 
Line 2  – Withholding and pass-through withholding
Enter the amount of Illinois Income Tax withheld from your wages or other income for the tax year and pass-through withholding made on 
your behalf for 2023 and reported to you on Schedule K-1-P or K-1-T.
Line 3 – Estimated income tax payments 
Enter the total amount of Illinois estimated payments you made with Form IL-1040-ES for the tax year. Include any overpayment credited to 
your 2023 tax.
Line 4 – Previous Form IL-505-I payment
Enter the amount of Illinois Income Tax you paid with any previous Form IL-505-I for this tax year.
Line 5 – Estimated allowable credits
Enter any estimated allowable income tax credits for 
   income tax paid to other states,
   Illinois Property Tax paid, 
   education expenses,
   volunteer emergency worker, 
   earned income, 
   pass-through entity tax credit, and 
   credits from Schedule 1299-C, Income Tax Subtractions and Credits (for individuals). 
See instructions for Form IL-1040, Schedule CR, Credit for Tax Paid to Other States, Schedule ICR, Illinois Credits, Schedule IL-EIC, 
Illinois Earned Income Credit, and Schedule 1299-C.
Line 6 – Total tax payments and credits 
Add Lines 2 through 5, and enter the total on Line 6.
Line 7 – Tentative tax due
Subtract Line 6 from Line 1. Round the result to whole dollars and enter it on Line 7 and on Form IL-505-I. This is your tentative tax due. If the 
amount is $1 or more, you must pay this amount. You may pay electronically (by credit card, EFT, or Electronic Funds Withdrawal) or file this 
form and attach your payment. If the tax due is less than $1, stop. Do not file this form. No payment is due.

                                          Tax Payment Worksheet for Your Records
 1   Enter the total income and other taxes you expect to owe and report on Form IL-1040.                         1                            
 2   Enter your Illinois Income Tax withheld and pass-through withholding.                       2 
   3 Enter your Illinois estimated payments and any overpayment credited to 2023.                3 
   4 Enter any tax payment made for tax year 2023 with a previous Form IL-505-I.                 4 
   5 Enter the estimated allowable credits for income tax paid to other states, Illinois Property
    Tax paid, education expenses, volunteer emergency worker, earned income, 
    pass-through entity tax credit, and credits from Schedule 1299-C.                            5 
   6 Total tax payments and credits. Add Lines 2 through 5.                                                       6                            
   7 Tentative tax due – Subtract Line 6 from Line 1. Round to whole dollars and enter here and on Form IL-505-I. 7 
IL-505-I (R-12/23)                                                                                                                                    Page 2 of 3

                              We encourage all taxpayers to pay electronically whenever possible. 

                                  By paying electronically, you can . . .
                                                                  Avoid mailing delays.
                                  Save a trip to the post office and the price of a stamp. 
                                   Get immediate confirmation of your payment.

                                  Visit mytax.illinois.gov to electronically pay.

      If you prefer to pay the amount of tentative tax you owe on your Form IL-1040, Individual 
      Income Tax Return, by mail, complete the IL-505-I at the bottom of this page and send it, along 
      with your payment, to the address on the voucher.

      Important: Do not redact Social Security Number(s) as this can cause processing delays.

       Do not file Form IL-505-I if no payment is due or if you make this payment electronically or by credit card.

 IL-505-I (R-12/23)                                                                                                      Page 3 of 3

                                  Return only the bottom portion with your payment.
      Illinois Department of Revenue

      IL-505-I   2023
      Automatic Extension Payment for Individuals                                                                            Official Use
 Enter your Social Security numbers in the order they appear on your federal return.    Do not file this form if no payment is due or you pay 
                                                                                        electronically or by credit card.
                 -          -                                  -  - 
 Your Social Security number      Spouse’s Social Security number  
                                                                                       For calendar year ending  
 Your first name & initial    Spouse’s first name & initial         Your last name     12/23 or fiscal year ending           /
                                                                                                                         Month and year 
 Street address
                                                                                           $ _____________ _____
                                                                                                    Tentative tax due (Whole dollars. only) 
 City                             State                          ZIP     
                                                                                       Make your check or money order payable to and mail 
 (    )                                                                                to: 
 Daytime phone number                                                                  ILLINOIS DEPARTMENT OF REVENUE
 IL-505-I (R-12/23)                                                                    PO BOX 19005
                                                             *71212231V*               SPRINGFIELD IL  62794–9005