Tax filers who under-report what they owe account for $387 billion of the gross tax gap. That’s not all due to nefarious deception. People make mistakes or get confused by what are objectively confusing tax rules.

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CNN MONEY : http://money.cnn.com/2016/04/29/pf/taxes/taxes-owed-tax-gap/index.html?section=money_pf_taxes