In 2010, the IRS audited 1.0% of taxpayers. For middle-income taxpayers, the percentage was even lower. Only 0.6% with adjusted gross income of $25,000 to $75,000 were audited, according to the IRS.
But traditional audits are just one way the IRS enforces the tax laws. Increasingly, the IRS is relying on what IRS Taxpayer Advocate Nina Olson calls “unreal” audits. These typically come in the form of a letter alerting you to errors or omissions on your return. While these audits are less intrusive than full-scale audits, they can still cost you real money.