(1) Levy in respect of a ship which trades solely between Australian ports (other than a ship to which subsection ( 2) applies) is payable on the first day of each quarter.
(2) Levy in respect of a ship that:
(a) is being first placed in commission after construction in an Australian port; or
(b) is usually employed or moored within the limits of an Australian port; or
(c) is an exempt ship on arrival at an Australian port and stops being an exempt ship while in that port; or
(d) is placed in commission at an Australian port, or is to be sent to sea from that port, after a period in respect of which levy was remitted under the regulations;
is payable on the day the ship leaves that port.
(3) Levy in respect of a ship (other than a ship to which subsection ( 1) , (2) or (4A) applies) is payable:
(a) where levy has not previously been paid in respect of the ship--on the day of its arrival at an Australian port; or
(b) where the ship arrives at an Australian port 3 months or more after the day on which levy was last payable in respect of the ship--on the day of its arrival at that port; or
(c) where the ship is in an Australian port on the day after the end of the period of 3 months after the day on which levy was last payable in respect of the ship--on the first - mentioned day.
(4) Levy is not payable in respect of a ship under subsection ( 3) merely because the ship arrives at, or is in, an Australian port:
(a) to take aboard water, provisions or fuel to be used by it for completing a voyage; or
(b) to engage or discharge a member of the crew; or
(c) to disembark a passenger or a member of the crew for medical treatment; or
(d) for shelter, repairs or refitting.
(4A) Levy in respect of a ship that is registered in the Australian International Shipping Register is payable on the first day of each quarter.
(5) Levy is not payable in respect of a ship more than 4 times in any period of 12 consecutive months.