Domicile. A domicile is different than and more than merely residing somewhere. You would fill out this form if you're ordering a vanity plate or some other specialized plate.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. An individual may be domiciled in another state but be a resident of Arizona for income tax purposes. Domicile refers to the place you call home permanently. Your domicile is important for legal purposes such as paying taxes, voting, and claiming benefits. Country of domicile is the country where you make your permanent home. An affidavit of domicile is a sworn statement signed before a notary public establishing the legal domicile of someone who has died. In fact, its meaning can be tricky.