Non-resident taxpayers are required to file an Illinois state tax return if your Illinois-sourced income was more than the allowable exemption. For 2023, this is $2,425 for single taxpayers and $4,850 for married filing jointly. If the royalties you received were less than the exemption, you are not required to file a state return (and don't add Illinois to your TurboTax return).
However, if Illinois state income tax was withheld from the royalty payments, you would need to file a state return in order to receive a refund of those taxes.
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