Commonwealth Consolidated Acts Commonwealth Consolidated ActsSubject to sections 84E and 84F, an increase payable by virtue of this Part in the rate of a pension that was, or is, under subsection 84(4), to be treated as having been, payable to a person on 30 June or 31 December (as the case requires) in a half - year applies in relation to the instalment of pension falling due on the first pension pay - day occurring after that day and in relation to all subsequent instalments.