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Internal Revenue Service Criminal Investigations
...The tax gap, the difference for a given year between taxes legally owed and taxes actually paid, for 2001 (latest available figure) is estimated to be between $312 and $353 billion. Criminal Investigation is one of the major IRS programs intended to minimize this revenue loss....

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Statistical Data - General Tax Fraud
...Incarceration includes confinement to federal prison, halfway house, home detention, or some combination thereof....