11. (1) Where a health benefits organization ceases to carry on business in the Territory of providing health benefits to contributors, it—
(a) is liable to pay the levy determined in accordance with this section; and
(b) shall, on or before the 15th day of the month in relation to which the levy is payable, lodge with the Commissioner a return in relation to that month.
(2) The levy payable by an organization by virtue of subsection (1)—
(a) is payable—
(i) where the organization ceased to carry on business before the 15th day of a month—in relation to that month; and
(ii) where the organization ceased to carry on business on or after the 15th day of a month—in relation to the next succeeding month; and
(b) shall be calculated in accordance with the formula referred to in subsection 8 (1).
(3) Subsection 9 (2) applies in relation to a return under paragraph (1) (b) in the same manner as it applies in relation to a return under subsection 9 (1).
(4) In the application of—
(a) subsection 9 (2) in relation to a return required to be lodged by an organization under paragraph (1) (b) in relation to a month (in this subsection called “the payment month”); and
(b) the formula referred to in subsection 8 (1) in relation to the levy payable by the organization under this section in relation to the payment month;
all contributions paid into the health benefits fund conducted by the organization that have not previously been required to be taken into account as contributions paid in respect of a reference month for the purpose of calculating the ambulance levy payable by the organization shall be taken to have been paid into that fund in the reference month applicable to the payment month.