You pay no property tax at all on the home you live in if you are the surviving parent or guardian of a service member who was declared missing in action or presumed dead, or who died from a service-connected cause that occurred while on active duty.
Apply to the assessor in the Massachusetts city or town where the property is. You have to apply again every year.
The report of casualty or death certificate, documentation that the death or missing in action determination arose from active duty service, proof of your relationship to the service member, proof you occupy the home as your domicile, and proof of your Massachusetts residency.