# The Teachers' Superannuation (Scotland) Regulations 2005, Paragraph 2


(1) The contribution period must be one of not less than one year, and begins on the first day of the month following the expiry of a period of one month from the date of acceptance of the election by the Scottish Ministers.
(2) The contribution period and the past period must be such that A + B does not exceed 15 per cent of his or her contributable salary for the time being, where–
A is the rate at which the additional contributions are payable; and
B is the rate at which he or she pays other contributions under Part C (except any treated as employer’s contributions) or towards the provision of a pension otherwise than under these Regulations.

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Source: https://www.legislation.gov.uk/ssi/2005/393/schedule/4/paragraph/2 (the official version)
Page: https://openlegislation.uk/teachers-superannuation-scotland-regulations-2005/schedule-4/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.