You do not have to be physically present in Illinois the entire year to be considered a full-year resident. Use our Affidavit of Domicile form to verify the last home address of a deceased person to speed up the inheritance process.Domicile is intended to be permanent rather than temporary, whereas residence means living in a particular locality and requires mere physical presence. Residents of Illinois. d). Domicile. For an independent student to be considered a resident of Illinois they must have physically resided in Illinois for 12 continuous full months. You are an Illinois resident if you were domiciled in Illinois for the entire year. Domiciliary intent is required to establish that the person is maintaining his or her permanent abode in this State. An affidavit of domicile is a legal document that certifies the residence of a deceased person.