12. All supplementary benefits are indexed each year in the manner provided for in section 244.11 of the Act, without taking into account subparagraph 1 of the first paragraph of that section.
Notwithstanding the foregoing, where the benefits are calculated pursuant to section 3 or to the second paragraph of section 10, they shall, at the same time, be indexed annually at the rate of increase in the Pension Index, as determined under that Act. The benefits shall also, at that time, be increased by the amount by which the amount that the indexing of the pension would have represented at that rate exceeds the amount by which the benefits were indexed.
O.C. 326-93, s. 12; O.C. 322-94, s. 2; O.C. 866-2010, s. 7.