2023 IL-1040-X Instructions - Illinois Department of Revenue-2026

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  1. Click ‘Get Form’ to open the 2023 IL-1040-X Instructions in our editor.
  2. Begin by entering your name and Social Security Number as shown on your tax return. Ensure accuracy for proper identification.
  3. In Section 1, compute your required annual payment by filling in your 2023 tax liability and your 2022 tax liability. Enter the smaller amount on Line 3.
  4. Proceed to Section 2, where you will calculate underpayments. Fill in the required payments based on the number of payments indicated in Line 4.
  5. For each payment period, enter amounts paid and any carryforward from previous periods. Calculate the underpayment or overpayment by subtracting Line 5 from Line 8.
  6. Review Section 3 for any exceptions that may apply to you. If applicable, follow the instructions provided to determine if you owe an underpayment penalty.
  7. Finally, complete Section 4 by calculating the penalty based on your underpayment amounts and enter them as instructed.

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Mailing Addresses AreaAddress IL-1040, Illinois Individual Income Tax Return Without Payment PO BOX 19041 SPRINGFIELD IL 62794-9041 With Payment PO BOX 19027 SPRINGFIELD IL 62794-9027 IL-1040-ES, Estimated Income Tax Payments for Individuals ILLINOIS DEPARTMENT OF REVENUE SPRINGFIELD IL 62736-00015 more rows
Mail your return to: ILLINOIS DEPARTMENT OF REVENUE. PO BOX 19047. SPRINGFIELD IL 62794-9047.
You can file Form IL 1040X electronically through IDORs website: or mail a paper copy to the address provided on the form.
When mailing your federal amended return, you will need to send the following: 1040-X. Income documents such as W-2s and 1099 forms if they support the changes on the return.

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