Sec. 451.419.  PENALTIES AND INTEREST:  EMISSIONS TAXES.  (a)  The following penalties apply to the late payment of motor vehicle emissions taxes:
(b)  A delinquent motor vehicle emissions tax bears interest at six percent a year from the date of delinquency until the tax is paid.
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.