All taxes imposed by this subchapter remaining unpaid, after they shall become due, shall bear interest in addition to the amount of the unpaid tax at the rate of 6% per annum, and the persons upon whom such taxes are imposed shall be further liable to the penalty of 1% of the amount of unpaid tax for each month or fraction of a month for the first six months of non-payment.
(Ord. 266, passed 11-6-1964)