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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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Closing Your Business

When you decide to close your business, you must contact the Illinois Department of Revenue regarding your tax liabilities. Contact can be made:

In addition, when you file your final tax form for each respective tax type, please indicate it is your final return by checking the box on the form. Note: Some returns may not have a final return box.