15. The provision for adverse deviations, notwithstanding the regulatory provisions made under section 128 of the Act, is the one provided for under the target-benefit pension plan. It may not be less than 20% of the liabilities of the plan determined on a solvency basis.
Despite the foregoing, to determine the maximum amount of surplus assets that may be allocated, in application of the second paragraph of section 30, to the restoration of benefits that were reduced, the provision for adverse deviations provided for under the plan is reduced by 50%.