Internal revenue

Internal revenue, the income a government takes in from its own sources, such as excise, sales, payroll, estate, income, and gift taxes. About 95% of the total U.S. revenue comes from its internal revenue, as opposed to outside revenue such as income from import and export duties. The U.S. government collects about $700 billion a year from the sum of its various types of internal revenue.

See also: Taxation.