How do I register to be an out-of-state withholding agent?

I have hired an employee in the state of Illinois. How do I register to be an out-of-state withholding agent?

To register your business you may choose one of the following options:

• Register electronically with our online Business Registration Application.  
• Complete and mail Form REG-1, Illinois Business Registration Application.  
• Visit a regional office.
  

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