Property Tax Reimbursement Forms (PTR) May Be Filled Out on the Following Days and Times. Deadline to file is October 31, 2024.The Middlesex County Board of Taxation passed a resolution that the board will not be holding virtual tax appeal hearings for tax year 2023. Guiding commercial and residential real estate owners through the process of reducing their taxes. Pay Personal Property Taxes Online enables online payments for personal property tax bills received from Middlesex County. Maintain accurate, legible and complete tax maps identifying the parcels of land in the Borough. Defend all assessed values challenged. Located in northern New Jersey, between Middlesex and Bergen counties, Essex County has one of the highest property tax rates in the state. Middlesex County Treasurer's Personal Property Taxes Help.