# The Teachers' Pensions Regulations 1997, 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 Secretary of State.
(2) The contribution period and the past period must be such that
A+B does not exceed 15% of the person's 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 pays other contributions under Part C (except any treated for the purposes of regulation G2 as employers' contributions) or towards the provision of a pension otherwise than under these Regulations.

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Source: https://www.legislation.gov.uk/uksi/1997/3001/schedule/4/paragraph/2 (the official version)
Page: https://openlegislation.uk/teachers-pensions-regulations-1997/schedule-4/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.