(1) Where, under any provision of this Act, interest is to be calculated on an amount, that interest must be calculated in accordance with a determination made by CSC for the purposes of that provision.
(1A) If, under a provision of this Act, notional interest is to be calculated on an amount, that interest must be calculated in accordance with a determination made by CSC for the purposes of that provision.
(2) A determination by CSC under subsection (1) or (1A) takes effect from:
(a) a specified day; or
(b) if no day is specified in the determination--the day of the making of the determination.
(3) Subsection (4) applies in relation to the following provisions of this Act as in force before 1 July 1990:
(a) the definitions of accumulated basic contributions and accumulated supplementary contributions in subsection 3(1);
(b) subsections 7A(1), (2), (3) and (4);
(c) subparagraphs 145(7)(d)(i), (8)(a)(i) and (9)(a)(i).
(4) Regulations in force immediately before 1 July 1990 and making provision in relation to interest for the purposes of any of the provisions in relation to which this subsection applies:
(a) remain in force on and after that date; and
(b) are taken, for the purposes of those provisions as in force on and after that date, to be determinations made by CSC; and
(c) may be amended or repealed by such determinations.