Probate of Wills and Estates. Find out when it's necessary to probate an estate, what the types of probate are, and how to probate an estate.Personal property tax bills are due on December 5th. 3. If I move out of Middlesex County or sell an item of personal property, will my tax bill be prorated? What is considered individual personal property? If you need an appointment, please click below to schedule at our main office in New Brunswick. We can provide you with samples of court forms that are available. We can provide you with guidance on how to fill out forms. Change of Address Forms. A single personal property assessment is made for all taxable personal property of the owner located in the city or town. 2.