you file two part-year returns. One for Illinois from 1/1 to 6/?/23 for all income earned while a resident and any other Illinois source income for the rest of the year like from rental property located in Illinois. For California from 6/?/2023 to the end of the year for all income earned while a resident and any California source income from 1/1 to 6/?/2023 like rental property located in California.
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If you lived inside of California during the tax year, you’re a part-year resident of California if you were a nonresident for some of the tax year. As a part-year resident, you pay California state tax on all income you received during the part of the tax year you were a resident of California, plus state income tax on income just from California sources while you were a nonresident.
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same rules for Illinois
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