20 C.F.R. § 219.61
Evidence of where the employee had a permanent home
The Board will ask for the following evidence to establish the employee's permanent home:
(a) The claimant's signed statement showing what the employee considered to be his or her permanent home.
(b) If the statement in paragraph (a) of this section or other evidence raises a reasonable doubt in establishing the employee's permanent home, evidence of where the employee paid personal property taxes, real estate taxes, or income taxes; or evidence where the employee voted; or other convincing evidence.