官方分析低估了降低边际税率对可征税收入的影响，但经验表明，边际税率降低会让纳税人工作更卖命、更多地以可征税现金而不是以额外津贴的形式获得报酬，并减少退税消费，从而使可征税收入水平大幅提高。
Official analyses downplay the effect of lower marginal tax rates on taxable income, but experience shows that taxable income rises substantially as taxpayers respond to lower marginal rates by working more, taking more of their compensation in taxable cash than in fringe benefits, and reducing their tax-deductible consumption.