Enter the information accurately according to the circumstances. If on 12/31/2020 he was no longer active-duty, then you will state that he was retired from active duty. All that is is a recognition that his active-duty status did not last the full calendar year. But that won't affect income that should still be excluded from Illinois tax. Review the W-2 income and make sure that after completing the form, on the following screen Do any of these uncommon situations apply to you?, that the active duty income box is checked. This should exempt the income from Illinois.
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