The Internal Revenue Service has increased its audits of taxpayers at upper-income levels.

According to IRS statistics released on Thursday, 12.48% of taxpayers with income of $1 million or higher were subjected to audits in fiscal year 2011, compared to 8.36% in fiscal year 2010. Those with incomes of $200,000 or higher were audited at a rate of 3.93% in fiscal year 2011, compared to 3.10% in fiscal year 2010.

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