How to mail illinois tax return

To mail your Illinois tax return, follow these steps:

1. Make sure you have the correct address: The Illinois Department of Revenue (IDOR) has several mailing addresses depending on the type of return and the payment method. You can find the correct address on the IDOR website or on the back of your tax return form.
2. Use the correct envelope: Use a sturdy envelope that can withstand mailing. Make sure the envelope is addressed correctly and has the correct postage.
3. Include all required documents: Make sure you include all required documents, such as:
   • Your completed Illinois tax return (Form IL-1040)
   • Any supporting schedules or forms (e.g., Form IL-1040-ES for estimated tax payments)
   • Any required attachments (e.g., proof of payment for deductions)
4. Use the correct payment method: You can pay your Illinois taxes by check, money order, or credit card. Make sure to include the payment with your return.
5. Sign and date your return: Sign and date your tax return to ensure it is valid.
6. Mail your return: Mail your return to the correct address, making sure to use the correct postage.

Mailing Addresses:

• For individual income tax returns (Form IL-1040):
  • Springfield: Illinois Department of Revenue, PO Box 19030, Springfield, IL 62794-9030
  • Chicago: Illinois Department of Revenue, 101 W. Jefferson St., 14th Floor, Chicago, IL 60602
• For business income tax returns (Form IL-1120):
  • Springfield: Illinois Department of Revenue, PO Box 19030, Springfield, IL 62794-9030
  • Chicago: Illinois Department of Revenue, 101 W. Jefferson St., 14th Floor, Chicago, IL 60602
• For estimated tax payments (Form IL-1040-ES):
  • Springfield: Illinois Department of Revenue, PO Box 19030, Springfield, IL 62794-9030
  • Chicago: Illinois Department of Revenue, 101 W. Jefferson St., 14th Floor, Chicago, IL 60602

Important:

• Make sure to keep a copy of your return and any supporting documents for your records.
• If you are filing electronically, you do not need to mail a paper return.
• If you are unable to file your return on time, you can request an extension by filing Form IL-505, Application for Extension of Time to File Illinois Income Tax Return.

For more information, you can visit the Illinois Department of Revenue website at www.revenue.state.il.us.