A well-functioning tax system requires that everyone pays the taxes they owe. Today, the “tax gap”—the difference between taxes that are owed and collected—totals around $600 billion annually and will mean approximately $7 trillion of lost tax revenue over the next decade. The sheer magnitude of lost revenue is striking: it is equal to 3 percent of GDP, or all the income taxes paid by the lowest earning 90 percent of taxpayers.
The tax gap can be a major source of inequity. Today’s tax code contains two sets of rules: one for regular wage and salary workers who report virtually all the income they earn; and another for wealthy taxpayers, who are often able to avoid a large share of the taxes they owe. As Table 1 demonstrates, estimates from academic researchers suggest that more than $160 billion lost annually is from taxes that top 1 percent choose not to pay.1
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