If payment is not received in the Tax Collector's office by the due date, you will be liable for any interest and fees that may have accrued. Real Estate, Personal Property, and Sewer accrue interest at a rate of 14%. Motor Vehicle Excise accrue interest at a rate of 12%. Tax Title accounts accrue interest at a rate of 16%. In accordance with MGL, late payments are applied to any interest and penalty fees first and then the remainder is put towards the principle.