The 1299C form is generated in your Illinois Income Tax return if you claim certain credits or subtractions in your Illinois return. As you navigate through your Illinois state return you will arrive at a page that says Take a look at Illinois Credits and Taxes:
- At the bottom of that page is a section that says Business and Investment Credits.
- If you claim any of those credits, you will generate a Ill 1299C in your Illinois State return.
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