A minister of finance (also called financial affairs, the treasury, the economy, or economic affairs) has many different jobs in a government. He or she helps form the budget, stimulate the economy, or helps control finances. Finance ministers are often found in state or provincial governments if that country has a form of federalism.
Finance ministers powers can vary from governments, but not like a foreign minister. Sometimes the finance minister is the most powerful cabinet post, like in Canada or New Zealand. Other times they are unpopular posts if they must raise taxes or cut spending.
In the United States, the finance minister is called the Secretary of the Treasury, though there is a separate Treasurer of the United States. In the United Kingdom, the finance minister is called the Chancellor of the Exchequer, though the prime minister is also the First Lord of the Treasury.