You would fill out this form if you're ordering a vanity plate or some other specialized plate. Acceptable proof of domicile establishes a person's true, fixed, and permanent home and principal residence.An individual may be domiciled in another state but be a resident of Arizona for income tax purposes. Domicile is the place where you have your permanent home. It is where you intend to return if you are living or working temporarily in another state or country. Simply put, your domicile is your home—the state you consider your permanent place of residence. The term "Domicile" is defined as a person's true, fixed and permanent home and principal residence. When completing an application for admission, students will be asked to provide documentation of the following: identity, citizenship status, and domicile.