In the event that the tax levied and imposed under this subtitle is not paid as required by this subtitle, the person and/or other legal entity liable for the payment of that tax shall be assessed by the Director of Finance for: the amount of the tax due; interest at the rate of ½% for each month or fraction of a month, accounting from the date when such written instrument was received for recordation; and a penalty of 10% of the tax due. Ord. 18-215