Internal Revenue Service(redirected from IRS (US))
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Internal Revenue Service(IRS), division of the U.S. Treasury Dept. that is responsible for the assessment and collection of most federal taxes, except those relating to alcohol, tobacco, firearms, and explosives. Established in 1862, the IRS derives most of its revenues from the collection of corporate and individual income taxincome tax,
assessment levied upon individual or corporate incomes. Although personal incomes were occasionally taxed in medieval Italian cities, the income tax is essentially a modern form of taxation.
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