In economics, a duty is a kind of tax levied by a state. It is often associated with customs, in which context they are also known as tariffs or dues. The term is often used to describe a tax on certain items purchased abroad. Properly, a duty differs from a tax in being levied on specific commodities, financial transactions, estates, etc. rather than on individuals. Duties may be import duties, excise duties, stamp duties, death or succession duties, etc.; but not such direct impositions as personal income taxes.