# The Building Societies (Accounts and Related Provisions) Regulations 1987, Paragraph 16


(1) With respect to any determination of the value of an asset of a society on any basis mentioned in paragraph 14, the amount of any profit or loss arising from that determination (after allowing, where appropriate, for any provisions for depreciation or diminution in value made otherwise than by reference to the value so determined and any adjustments of any such provisions made in the light of that determination) shall be credited or (as the case may be) debited to a separate reserve (referred to in these Regulations as “the revaluation reserve”).
(2) The revaluation reserve shall be reduced to the extent that the amounts standing to the credit of that reserve are no longer necessary for the purpose of the accounting policies adopted by the society, but an amount may only be transferred from that reserve to the income and expenditure account if either—
(a) the amount in question was previously charged to that account, or
(b) it represents a realised profit.
(3) The treatment for taxation purposes of amounts credited or debited to the revaluation reserve shall be disclosed in a note to the accounts.

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Source: https://www.legislation.gov.uk/uksi/1987/2072/schedule/5/paragraph/16 (the official version)
Page: https://openlegislation.uk/building-societies-accounts-and-related-provisions-regulations-1987/schedule-5/paragraph-16
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.