Definition of the Internal Revenue Service noun from the Oxford Advanced Learner's Dictionary

 

the Internal Revenue Service

 noun
noun
BrE
 
; NAmE
 
[singular](abbreviation IRS)
 
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(in the US) the government department that is responsible for collecting most national taxes, for example income tax compare HM Revenue and Customs Culture Other taxes the IRS 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 was created by the US Congress in 1789 and is part of the US Department of the Treasury.
See the Oxford Advanced American Dictionary entry: the Internal Revenue Service