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2023 Form IL-1040 Instructions

Mailing your income tax return:

If no payment is enclosed, mail your return to:

ILLINOIS DEPARTMENT OF REVENUE
PO BOX 19041
SPRINGFIELD IL 62794-9041

If a payment is enclosed, mail your return to:

ILLINOIS DEPARTMENT OF REVENUE
PO BOX 19027
SPRINGFIELD IL 62794-9027

Index

  1. What’s New for 2023?
  2. Tips To Speed Up The Processing Of Your Return
  3. General Information
  4. Step 1 Personal Information
  5. Step 2 Income
  6. Step 3 Base Income
  7. Step 4 Exemptions
  8. Step 5 Net Income and Tax
  9. Step 6 Tax After Nonrefundable Credits
  10. Step 7 Other Taxes
  11. Step 8 Payments and Refundable Credit
  12. Step 9 Total
  13. Step 10 Underpayment of Estimated Tax Penalty and Donations
  14. Step 11 Refund or amount you owe
  15. Step 12 Health Insurance Checkbox and Signature
  16. Allocation Worksheet
  17. Comptroller Report
  18. For Tax Assistance