Of the 142.9 million federal individual income tax returns filed in tax year 2010, 84.5 million (59.1%) were classified as taxable returns or returns with a total income tax greater than $0. (Source IR-2013-26).
Of the 143,399,737 federal individual income tax returns filed in tax year 2011, 1,481,966 (1.03%) were audited by the IRS in the government’s fiscal year ended September 30, 2012. Generally the audit percentages increased as the adjusted gross income reported on the return increased.
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(Source: Internal Revenue Service Data Book, 2012 Publication 55B Washington, D.C., March 2013)