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9 Costly Mistakes Taxpayers Make

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For as much as Americans complain about paying taxes, we sure leave a lot of money on the table—thanks to poor tax planning, sloppy filing and the sheer complexity of the tax code. Last year, the IRS reported that it was holding on to $1 billion in unclaimed refunds for folks who didn't file a tax return in 2011.

Some taxpayer mistakes, such as providing the wrong Social Security number on your return, will simply delay processing of your return (and, potentially, your refund). But other mistakes, including the nine featured here, may cost you more than time. Plan ahead and take extra time with your return to avoid these expensive taxpayer errors.

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