Pay Personal Property Taxes Online enables online payments for personal property tax bills received from Middlesex County. All owners of taxable personal property are required, annually, to file a Personal Property Declaration Form M15.We'll walk through a short guide to how to prepare the property statement. For example, corporations are taxable on their networks of poles, underground conduits, wires and pipes and machinery used in the conduct of business. What do I do if I dispose of a vehicle? What do I do if I dispose of a boat or jet ski? We can provide you with samples of court forms that are available. We can provide you with guidance on how to fill out forms. Taxpayers should use these forms and guides to apply for local tax abatements and exemptions and file property returns. Overview of Truth in Renting Act. 1.