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The Internal Revenue Service (IRS) is the revenue service of the United States federal government. The agency is a bureau of the Department of the Treasury, and is under the immediate direction of the Commissioner of Internal Revenue.
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www.irs.gov/privacy-disclosure/tax-code-regulations-and-official-guidance

Aug 7, 2017 ... Treasury regulations (26 C.F.R.)--commonly referred to as Federal tax ... the official interpretation of the IRC by the U.S. Department of the Treasury. ... these items, please feel free to subscribe to our IRS GuideWire service.

www.irs.gov

The Internal Revenue Service is the nation's tax collection agency and administers the Internal Revenue Code enacted by Congress.