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Tips To Speed Up The Processing Of Your Return

  • File your return electronically! Visit or see your tax professional.
  • Enter your correct Social Security number (SSN) and name. If you are married, you must include your spouse’s SSN and name.
  • If you received federally taxed Social Security benefits or qualified retirement income, you may be able to subtract it on Line 5. See the Line 5 Instructions for details.
  • Attach a completed Schedule IL-WIT and all withholding forms (W-2s, 1099s, etc.) to support the amount you claim as Illinois Income Tax withheld on Line 25.
  • Enter the correct amount of estimated payments you made, including any overpayment applied from a prior year return. You may verify the amount using the estimated payment inquiry on our website.
  • Include any required attachments (e.g., Schedule M, Schedule ICR, Schedule IL-E/EIC, Schedule CR, federal Form 1040 and Schedules) with your Form IL-1040.
  • Make sure to have any support documentation available if requested.
  • If you are claiming a property tax credit, you must enter the county in which your property is located and the property index number on Schedule ICR, Illinois Credits.
  • If you enter an amount you want refunded to you on Line 37, you must check one box on Line 38 to indicate how you would like us to issue your refund. You may select direct deposit or paper check.
  • Review the entries you made on each line for accuracy and verify your calculations.
  • Sign your return.