"Delegated legislation": 1. Law made by ministers under delegated powers given to them by Parliamentary Acts. Sometimes referred to as secondary legislation or subordinate legislation. 2. A secondary source of UK tax law that is not written by parliament but usually by Her Majesty's Revenue & Customs. 3. Law created by any other subordinate law-making body, within the authority of an Enabling Act - or other primary legislation - enacted by the primary law-making body.