A Declaration of Domicile is a legal document that identifies your principal home in Florida, with tax and asset protection benefits. Being domiciled in Florida means that you have established the state as your permanent legal residence.Domicile determines which state can probate a will. It determines which state can tax estate assets. A sworn Declaration of Domicile must be filed with the clerk of the circuit court in the area of Florida where you reside. Your domicile is the state that you intend to make your permanent and primary home. There are significant benefits to establishing a domicile in Florida.