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the Internal Revenue Service

noun
🔊/ði ɪnˌtɜːnl ˈrevənjuː sɜːvɪs/
🔊/ði ɪnˌtɜːrnl ˈrevənuː sɜːrvɪs/
[singular]
(abbreviation IRS)
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  1. (in the US) the government department that is responsible for collecting most national taxes, for example income tax（美国）国税局
    CultureThe first income tax was collected in 1862 by the Commissioner of Internal Revenue. Other taxes the IRS now collects include company tax and taxes on gifts, goods, services and estates (= money, property and other possessions left by people when they die). The IRS is part of the Department of the Treasury.
    compare HM Revenue and Customs