R-9 - Act respecting the Québec Pension Plan

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116.2.1. A contributor’s average first additional monthly pensionable earnings are equal to G’/480,
G’ is the contributor’s total first additional pensionable earnings for each month included in his first additional contributory period.
Where the total number of months included in the contributor’s first additional contributory period exceeds 480, only the 480 months for which the first additional pensionable earnings are the highest will be considered.
2018, c. 22018, c. 2, s. 60.