Commonwealth Consolidated Acts Commonwealth Consolidated ActsAn increase payable by virtue of a provision of this Part, other than section 125, in the amount of the annual pension that was, or is, under subsection (4) of section 121, 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.