Complete Form ET-141 if it is claimed that the decedent was not domiciled in New York State at the time of death. 27 What other information do you wish to submit in support of the contention that the decedent was not domiciled in the state of New York at the time of death?How to Fill Out an Affidavit of Domicile With SignSimpli in Five Steps. The good news is that filling out an affidavit of domicile is fairly simple. Affidavit 3a. Type:pdf. Size:21.9 KB. Name:Affidavit 3b. Type:pdf. Fill out this form. 2. Submit it to your County Treasurer with proof of residency (contact your county for their requirements). 3. Use our Affidavit of Domicile form to verify the last home address of a deceased person to speed up the inheritance process.