If you fail to pay some or all of a * GST instalment by the time by which the GST instalment is due to be paid, you are liable to pay the * general interest charge on the unpaid amount for each day in the period that:
(a) started at the beginning of the day by which the GST instalment was due to be paid; and
(b) finishes at the end of the last day on which, at the end of the day, any of the following remains unpaid:
(i) the GST instalment;
(ii) general interest charge on any of the instalment.