As this report shows, this change would somewhat reduce the steep regressivity of Colorado’s overall tax system. In other words, taxpayers across all income levels would pay a more equal share of their income if Amendment 66 is approved, in large part because most of the revenue raised by the amendment would come from the wealthiest 20 percent of Colorado residents.
Colorado has become infamous for its Taxpayer Bill of Rights, or TABOR, a constitutional amendment restricting growth in revenue collections to an arbitrary “population-plus-inflation” formula. Although TABOR has had significant negative effects on Colorado’s finances, similar proposals have surfaced in at least 30 states over the past decade. None of these proposals were approved, and in five states they were placed directly on a state-wide ballot where they were rejected by voters. Even in Colorado itself, citizens voted to suspend TABOR for five years in an effort to allow the s