(1) A certificate of delinquency or personal property certificate of delinquency shall bear simple interest at twelve percent (12%) per annum. Interest shall initially be calculated based on the base amount established by KRS 134.122(2)(d). Interest shall be calculated in subsequent months on the outstanding balance of the base amount until paid. A fraction of a month shall be counted as an entire month.
(2) If a certificate of delinquency is paid by a third-party purchaser, the amount paid by the third-party purchaser shall become the base amount upon which simple interest is initially calculated. Interest shall be calculated in subsequent months on the outstanding balance of the base amount until paid.