A domicile is an individual's principal place of residence, the place to which he intends to return when he goes out. Domicile refers to the place you call home permanently.Your domicile is important for legal purposes such as paying taxes, voting, and claiming benefits. Change Legal Documents to Reflect Residency in the New State. Update your will and any trusts. Redeker9 the challenged regulation classified an adult stu- dent as a resident only if he had resided in the state for twelve months im-. This means the county where the Decedent lived and considered their primary home address before they died. A person's domicile is independent of the person's nationality: a person can change his or her domicile without changing his or her nationality.