Taxes Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit. Federal Income Tax Use this calculator to estimate your income tax liability along with average and marginal tax rates. What If You Get Audited? The chances of an IRS audit aren't that high. And being audited does not necessarily imply that the IRS suspects wrongdoing. How Much do I owe? Have a Question Name Email Address Phone Question Thank you! Oops!