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Its voluntary compliance rate is about 83%, meaning that about 17% of tax revenue that should have been collected wasn't. In 2006, that was $450 billion.
Some of that $450 billion is, of course, willful tax evasion. But another part is simply unintentional errors by taxpayers --mistakes that could be offset by better IRS customer service. "If the IRS can help taxpayers correctly comply with law, it will have a direct impact on the revenue it collects," Porter says.
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