In accordance with Article XVI, paragraph 3, of the IRSG Constitution, a notice of withdrawal by a member is to be delivered in writing to the Secretary-General by 1 November to be effective on 30 June of the subsequent calendar year and members giving notice after 1 November are liable for the membership contribution for the next ensuing financial year.
Text as published in the Official Journal, reproduced verbatim (including any typographical quirks of the source). For the authentic version, see EUR-Lex.