Decentralisation of powers to cities Devolution of powers to cities is a form of devolution in England. These powers include granting some city mayors with more financial powers and control over their own city budget. These powers also include being able to keep revenue from business rates, which are local taxes on commercial businesses, so that they can be invested in city projects. Devolution deals have involved Manchester, Cornwall, Liverpool, Yorkshire, the West Midlands and North of Tyne.