(1) The amount of charge is the amount ascertained in accordance with the regulations.
(2) Without limiting subsection (1), the regulations may provide that the amount of the charge imposed on the grant or transfer of a chargeable permission may be calculated wholly or partly by reference to things which happen during the period:
(a) beginning on the later of the following days:
(i) the date of commencement of this section;
(ii) the date of the grant or transfer of the chargeable permission; and
(b) ending on the day on which the chargeable permission ceases to be in force.