The minister of Finance, originally known as colonial treasurer, is a minister and the head of the New Zealand Treasury, responsible for producing an annual New Zealand budget outlining the government's proposed expenditure. The position is often considered to be the most important cabinet post after that of the prime minister.

Ministers in the New Zealand Government are members of Parliament (MPs) who hold ministerial warrants from the Crown to perform certain functions of government. This includes formulating and implementing policies and advising the governor-general. Ministers collectively make up the executive branch of the New Zealand state. The governor-general is obliged to follow the advice of the prime minister on the appointment and dismissal of ministers.