Is your employer withholding state tax for IL? Or for IN? In general when you live in one state but work in another state, you need to file a NON-resident return first for the state you worked in, and then do a resident state return for the state you live in. You will get credit from your state for tax you paid to the state you worked in.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/state-taxes/would-file-nonresident-state...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/printers-printing/file-nonresident-state...
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