The Isle of Man (Customs) Act 1887 empowered Tynwald with the power to alter the rates of customs duties with temporary effect, subject to confirmation by the annual Acts of Parliament. The Isle of Man (Customs) Act 1955 substituted confirmation by Order in Council, thereby ending the requirement for these Acts to be passed annually. The Isle of Man Act 1958 finally gave the island's insular legislature, Tynwald, the power to pass laws to impose such duties without requiring any confirmation.