The main amendments have effect for the purposes of Schedule 7AA to the Taxation of Chargeable Gains Act 1992 (restrictions on setting losses against pre-entry gains) in relation to accounting periods ending on or after 21st March 2000.

Any question whether a company was, in relation to times before 21st March 2000, a member of a group shall be determined by reference to the position under the Taxation of Chargeable Gains Act 1992 as it stood before the main amendments.