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Knowledge Base / How often must I file my tax return?

The Illinois Department of Revenue (IDOR) determines how often you must file a return based on your initial registration and annual liability. Filing requirements based on your average monthly liability are determined as follows:

If your average monthly liability is:

  • greater than $200, the department may notify you that your fi ling frequency has been changed to a monthly requirement.
  • between $50 and $200, the department may notify you that your fi ling frequency has been changed to a quarterly requirement.
  • less than $50, the department may notify you that your fi ling frequency has been changed to an annual requirement.

Posted in: Electronic Filling