An affidavit of domicile is a sworn statement signed before a notary public establishing the legal domicile of someone who has died. An affidavit of domicile is a legal document that certifies the residence of a deceased person.Domicile refers to the place you call home permanently. Your domicile is important for legal purposes such as paying taxes, voting, and claiming benefits. An affidavit of domicile is a legal document used to establish a deceased person's primary residence at the time of their death. Domicile is the primary place that a person treats as their permanent home, or lives in and has a substantial enough connection with that the court uses it. An Affidavit of Domicile is a legal document that you can use to verify the home address of a person who has died. Where someone is domiciled is an import question with respect to service of process. 1. a dwelling place : place of residence : home 2. Law a : a person's fixed, permanent, and principal home for legal purposes