According to the Illinois Department of Revenue link: Illinois Filing Requirements,
You should file an Illinois tax return if you were an Illinois resident who was claimed as a dependent on your parents’ or another person’s return, you must file Form IL-1040 if
- your Illinois base income from Line 9 is greater than your Illinois exemption allowance, or
- you want a refund of Illinois Income Tax withheld from your pay.
NOTE: If your parent reported your interest and dividend income through federal Form 8814, Parent’s Election to Report Child’s Interest and Dividends, do not count that income in determining if you must file your own Form IL-1040.
Your taxable income will be taxed at 4.95%.
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