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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

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What is a Return Correction Notice (RCN)?

A Return Correction Notice (RCN), is a letter we send to you when we find problems with your Illinois tax return. The letter details the problems we found, any changes we made, and the action you need to take.

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