A note that describes in detail how the Perpetuities and Accumulations Act 2009 changed the law when it came into force on 6 April 2010. It explains how changes to the rules against perpetuities and excessive accumulations affect new and existing wills and trusts, including wills republished by codicil and trusts of pension death benefits, and links to information about how the changes affect deeds of variation and section 31 of the Trustee Act 1925.