Requirements for resident status are on the Residency Classification site.
In Arizona, as in all other states, instruction fees at publicly supported universities are lower for residents than for nonresidents. Through the payment of taxes, Arizona residents contribute to the general fund of the state from which the legislature appropriates funds comprising the major source of support for Arizona's universities.
A student enrolling at The University of Arizona for the first time, or a student returning after an absence of one or more semesters, must provide information which will allow classification as either a resident or nonresident of Arizona for tuition purposes. For new students, this information is requested on the application for admission; for returning students, a domicile affidavit is provided with the application for readmission. Because international students (non-immigrants) are classified nonresidents of Arizona while enrolled, a domicile affidavit is not required.