State tax filing

Mike9241 · ‎April 12, 2025

An expat, or expatriate, is a person who is living in a country that is not their own, either temporarily or permanently.

You are an Illinois resident if you were domiciled in Illinois for the entire year. Your domicile is the place where you reside and the place where you intend to return after temporary absences. Temporary absences may include residence in a foreign country.

domicile = the country that a person treats as their permanent home, or lives in and has a substantial connection with.

so if your residence in japan is temporary and you are domiciled in illinois, you are suppose to file a return if you meet either of the criteria below.

if have no place of domicile in the US you do not file an Illinois return.

Who must file an Illinois tax return?

If you were

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an Illinois resident, you must file Form IL-1040 if

you were required to file a federal income tax return, or
you were not required to file a federal income tax return, but your Illinois base income from Line 9 is greater than your Illinois exemption allowance.