Do Illinois students under 18 have to pay state income tax?

[TomD8]

If you're an Illinois resident, you must file an Illinois tax return if you were required to file a federal tax return, or if you were not required to file a federal return, but your Illinois base income from line 9 is greater than your Illinois exemption allowance.

If you're claimed as a dependent on your parents' return, you must file if your Illinois base income from line 9 of your IL-1040 is greater than $2,225. (2018)

Your age or student status does not exempt you from these requirements.

https://www2.illinois.gov/rev/forms/incometax/Documents/currentyear/individual/il-1040-instr.pdf