Hi and great question! In addition to what Cindy4 said, in 2024, you will need to file a tax return in Illinois to report your earned income from Illinois sources while a non-resident of Illinois AND your earned income from any source while you were a resident of Illinois.
Please see these articles for additional information:
You would be an Illinois resident at the point at which you move there permanently with no intent to be there on a temporary basis. Until that point, you would still be a resident of Florida (presumably), but you would still need to file an Illinois tax return to report your Illinois sourced income. This is likely why your new employer asked you to provide the IL-W-4 and began withholding Illinois taxes from your wages.
In essence, then, you will need to file a 2024 tax return in Illinois to report your Illinois sourced earnings (regardless of where you lived when you earned them) and any income you received after you moved to Illinois.
As you know, Florida has no income taxes, so there will be no need for you to file a Florida tax return in 2024.
I hope this is helpful.
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