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.A single personal property assessment is made for all taxable personal property of the owner located in the city or town. 2. We'll walk through a short guide to how to prepare the property statement. Pay Personal Property Taxes Online enables online payments for personal property tax bills received from Middlesex County. All tangible household personal property and personal effects located within the Borough of Middlesex, shall not be assessed and taxed. Property Tax Reimbursement Forms (PTR) May Be Filled Out on the Following Days and Times. Calculate how much you'll pay in property taxes on your home, given your location and assessed home value. Taxpayers should use these forms and guides to apply for local tax abatements and exemptions and file property returns.