Who gets audited by the Internal Revenue Service?

The Internal Revenue Service only audits about 1 percent of individual tax returns each year. But the more money you make, the more likely you are to get audited. A look at which returns were audited in the 2012 budget year:
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Individual returns filed in the previous year:                143 million.
Audited by mail: 1.1 million.
Audited in person: 360,000.
Audit rate: 1 percent.
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Individual returns with incomes above $200,000:         4.8 million.
Audited by mail: 109,000.
Audited in person: 70,000.
Audit rate: 3.7 percent.
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Individual returns with incomes above $1 million: 337,000.
Audited by mail: 23,000.
Audited in person: 18,000.
Audit rate: 12.1 percent.
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Small corporation returns (assets under $10 million): 1.9 million.
Audited: 21,200.
Audit rate: 1.1 percent.
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Large corporation returns (assets $10 million and higher): 60,500.
Audited: 10,800.
Audit rate: 17.8 percent.
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Source: IRS enforcement: http://tinyurl.com/agwzcon