The Internal Revenue Service requires that all income be reported in a tax return, and failure to do so can result in many penalties. Most penalties can be waived if you can convince the IRS that you had reasonable cause for not reporting the income and didn't understand that you needed to report that income on your return.
Workers who earn tips are required to report all tips to their employer. Unreported tips may face a 50-percent penalty on the required Social Security, Medicare and railroad retirement taxes, since your employer was unable to withhold the required amount. The IRS tacks on an accuracy penalty of 20 percent if you underpay your tax by not reporting income. You might face the accuracy penalty for any of the following reasons: you are negligent or disregard IRS rules; you "substantially" underpay your tax; you claim tax benefits for a false transaction; or you fail to disclose a foreign asset.
Not reporting your income could result in the IRS tacking on a fraud penalty. The fraud penalty is 15 percent for each part of a month that your tax was late due to fraud, with a maximum of 75 percent. There is a second fraud penalty of 75 percent for substantially underpaying your tax due to fraud. There is also a $5,000 penalty if the IRS determines you've submitted a frivolous tax return containing substantially unreported income.
Failure to report income to the IRS will also result in penalties, as essentially you have missed a payment and face a late-payment penalty. The IRS levies a failure-to-file penalty of 5 percent for each part of a month that a return is late, with a maximum of 25 percent. After the return is 60 days late, there is a penalty: the lesser of $135 and the unpaid tax. The IRS also charges a failure-to-pay penalty of 0.5 percent of your unpaid tax for each portion of a month the tax goes unpaid.
Interest is charged on all tax not paid by the due date. It is also charged if you get an extension. Certain penalties, including those for failure to file, accuracy, and fraud, accrue interest from the date the tax was due. Other penalties don't accrue interest until you receive a notice from the IRS.
An intentional failure to report income to the IRS can result in penalties worse than mere fines; the IRS may come after you for criminal penalties. The IRS typically goes after filers for tax evasion, intentionally not filing a return, intentionally filing incorrect information, intentionally not paying the correct amount of tax, making a fraudulent statement and preparing a fraudulent return.
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