When property taxes shall become delinquent, the treasurer shall add to all taxes paid thereafter a collection fee of four percent (4%) of the amount of the taxes. Such collection fee shall belong to the City and constitute a charge and shall be a lien against the property to which the taxes themselves apply, collectible in the same manner as the taxes to which they are added. The City may by ordinance provide interest and penalties for delinquent city real and personal property taxes.