How to fill out the Affidavit of Domicile Form Instructions? 1. Obtain the Affidavit of Domicile form. 2.This affidavit is made for the purpose of securing the transfer or delivery of property owned at the time of the decedent's death to a purchaser. An affidavit of domicile is a legal document that certifies the residence of a deceased person. Complete the enclosed Affidavit of Domicile attesting to the decedent's state of residency, and have the completed form notarized. An Affidavit of Domicile is a concise legal document affirming a deceased person's primary place of residence at the time of death. An affidavit of domicile is a short legal document that helps to establish a person's place of residence following his or her death.