No, it's not your call whether to call IL the domicile state. Your son is definitely a resident once he gets a job in IL.
- He probably changed his drivers license and other documents to read IL.
However, when he received the 1099-NEC, he was a resident of MI. You even stated in your description that your son was a MI resident.
- He probably had a MI drivers license and other documents to read MI.
It doesn't matter that the 1099-NEC has his IL mailing address. The mailing address does not automatically make you an IL resident.
Please see the TurboTax FAQ What is my state residency status?
- Generally, you're a resident of a state if you don't intend to be there temporarily. It's where home is—where you come back to after being away on vacation, on a business trip, or at school. Think of it as your permanent home.
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