A single personal property assessment is made for all taxable personal property of the owner located in the city or town. 2. If I move out of Middlesex County or sell an item of personal property, will my tax bill be prorated?Middlesex County does not prorate personal property. Is the Homestead form difficult to understand and fill out? No. It simply asks for basic information. Common examples of investment property range from the obvious, like stocks and bonds, to lesser-known property, like art and collectibles. This service is voluntary for individuals who want to know if fraudulent activity has occurred under their name or on property located in Middlesex County. Property Tax Forms and Guides. Taxpayers should use these forms and guides to apply for local tax abatements and exemptions and file property returns. You don't need an original deed to sell or refinance property.