18-125-603 Me. Code R. § .08
The word "domicile" is a common-law (i.e., judge-made law) term that the Maine courts, not the Legislature or Maine Revenue Services, have defined. Under the Maine common law, "domicile" means the place (A) where a person resides, and (B) where that person intends to remain and, whenever absent, intends to return. Thus, according to the Maine courts, domicile has two components: residence and the intent to remain or return, if absent. The intent to move in the future is not sufficient to establish domicile. Once an individual's domicile is established in Maine, it continues here until domicile is established elsewhere. An individual alleging a change in domicile has the burden to show that domicile was established in another state or country.
Where a decedent was domiciled at the date of death is a question of fact in which objective factors exhibiting the decedent's actual location and intent may be relevant. Factors that may be relevant or excluded in determining a decedent's domicile at the date of death include those relevant or excluded in determining income tax domicile (for more information see MRS Rule 807(.03) and (.04) 18-125 C.M.R., ch. 807, as well as the locations of significant relatives or an appointed attorney-in-fact for health care or financial decisions. Where the decedent qualified for financial assistance for health care, where the decedent had a contract for residence or care at a residential living facility, or where the decedent qualified as a statutory resident for income tax purposes may all be factors to be considered in determining domicile.
Maine Revenue Services considers all of an individual's relevant facts and circumstances allowed by Maine law when it determines where that individual is domiciled. Although the individual's intent to remain or return is a factor in determining domicile, an individual's statement as to his or her intent is not necessarily determinative. Evidence of the decedent's intent may be found in many decisions made by that individual. The decedent may have retained the ability to make such decisions and determine his or her domicile even though the decedent was deemed incapable of making, or chose not to make, other decisions. Actions by a person who was responsible for an incapacitated individual's affairs may be considered when determining the decedent's intent to remain. When a guardian has been appointed and chooses the incapacitated individual's place of abode pursuant to authority as a guardian, the intent of the guardian for the individual to remain or return to a particular location becomes a factor in the determination of the incapacitated person's domicile. Evidence of the guardian's intent may be found in relevant statements and actions.
18-125 C.M.R. ch. 603, § .08