“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. The IRS is responsible for collecting taxes and the interpretation and enforcement of the IRC (Internal Revenue Code).”
From Wikipedia: http://en.wikipedia.org/wiki/Irs
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Internal Revenue Service (IRS) – Home
http://www.irs.gov/
IRS SOI Tax Stats – Individual Income Tax Return (Form 1040) Statistic
http://www.irs.gov/taxstats/indtaxstats/article/0,,id=98123,00.html
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