A Declaration of Domicile is a legal document that identifies your principal home in Florida, with tax and asset protection benefits. 'Domicile' generally refers to where you live – your residence that you intend to keep for the foreseeable future.An Affidavit of Domicile is a legal document that declares your intention to make Florida your permanent and principal home. Domicile planning consists of determining the appropriate domicile and taking steps to document the choice of domicile. Have you ever heard of a "Declaration of Domicile? " A Declaration of Domicile is a legal document that helps establish Florida residency.