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  1. Where do I mail my Illinois Corporation Tax Return?
  2. Where do I mail the Illinois Corporation IL-1120-Es tax payments?
  3. When are the Illinois "C" corporation estimated income tax payments due?
  4. When should I file my Illinois State Corporation Tax Return?
  5. Which Form should be used to file an Illinois State Corporation Tax Return?
  6. Does Illinois State recognize an automatic federal extension?
  7. How many Corporation Income Tax Rates does Illinios State have for Tax Year 2008?