Statutory minimum increase rates The table below summarises the current statutory minimum increase that occupational pension schemes must apply annually to each tranche of pension. Period of pensionable service to which pension is attributable (or, in the case of money purchase benefits, period in which contributions were made) Statutory minimum pension increase Source Before 6 April 1997 None, save that in order to refund surplus assets to a sponsoring employer under the Social Security Pensions Act 1975, s 58A, it used to be necessary (up until 5 April 2006) to revalue all pensions in payment (excluding GMPs and money purchase benefits) annually in line with RPI subject to a cap of 5% Despite the absence of a statutory minimum increase, most defined benefit schemes pay some pre-1997 indexation because of scheme rules or as a discretionary benefit. As at March 2023, research suggests that only 17% of members of private sector defined benefit pension schemes do not receive any pre-1997 indexation on benefits Calls have been made on the government to legislate to mandate inflation-linked increases