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What should I do if I mailed my income tax return but did not sign it?

Once your return is received and processed we will mail you a notice to sign and send back to us. If you do not sign the notice within 30 days, you may then be subject to a late-filing penalty.

You may access additional information by searching the entire Illinois Department of Revenue website.

If you have additional inquiries, you may submit them on the Questions, Comments, or Requests form.