If your spouse was a service member who died in the line of duty, your house and the yard around it are completely exempt from Maryland real property tax. There is a separate application form for this path.
Apply through your local Maryland Assessment Office, not the state, using the property tax exemption application for surviving spouses of active military personnel who died in the line of duty.
The death certificate or report of casualty showing the death was in the line of duty, your marriage certificate, and proof you own the home and live in it.
