The Criminal Investigative Division of Internal Revenue Service (IRS-CI) does not just investigate tax fraud, but because of their renown skills for forensic accounting they are often used by prosecutors to investigate complex financial crimes.

FORBES: Broughton -- Rented Assets And Bogus Offshore Insurance Companies

Even worse, these proposals will enormously increase the power of the Internal Revenue Service (IRS) over middle-and lower-income Americans: Because of all the conditions, tax collectors will have more reasons than ever to paw through your personal and financial lives to ensure you are complying with an already incomprehensible code.

FORBES: Fact And Comment

Now the U.S. Internal Revenue Service (IRS) has an even bigger problem: the marketing of push-the-edge and over-the-edge shelters to the masses.

FORBES: U.S. tax rackets

You could use the online free file option provided by the Internal Revenue Service (IRS) (which has income limits), the online e-file option or various other free filing services available online.

FORBES: Simple Last-Minute Tax Tips

Enrolled agents are licensed by the Internal Revenue Service and must either pass a two-day test or have worked for the IRS for five years.

FORBES: Magazine Article