"Owned" includes possession by a purchaser under a land contract, possession by one or more joint tenants or tenants-in-common, and possession under a legally binding agreement that allows the owner of the dwelling to transfer title to the property but continue to occupy the dwelling as a home until some future event stated in the agreement.
Ownership of a homestead may be by fee, by life tenancy, by bond for a deed, as mortgagee, or any other similar possessory interest provided that the owner is personally responsible to the municipality or taxing authority for the property tax for which the property tax fairness credit is claimed.
A dwelling does not include room and board, a nursing home room, or a room in another person's private home.
Occupying the homestead. The taxpayer must occupy the homestead as the taxpayer's primary residence during the tax year. A taxpayer is considered to have occupied the homestead during a temporary absence due to exigent circumstances (such as illness, hospitalization and military deployment), provided that the taxpayer does not rent the homestead to another person during the period of temporary absence.
18- 125 C.M.R. ch. 813, § .02