Of the 142,823,105 individual income tax returns filed in calendar year 2009, 1,581,394 individual income tax returns (1.1 percent) were examined by the IRS in the government’s fiscal year 2010. Of the 2,143,808 corporate income tax returns (excluding S corporation returns) filed in calendar year 2009, 29,803 corporate income tax returns (1.39 percent) were examined by the IRS in the government’s fiscal year 2010.

(Source: Internal Revenue Service Data Book, 2010, Publication 55B, Washington, D.C., March 2011)