That is why its adoption is often associated with an increase in value-added tax rates (as has occurred throughout Eastern Europe). In the US, the Republican presidential candidate Herman Cain’s “9-9-9” plan calls for a 9% rate for personal and corporate taxes, together with a new 9% national sales tax.
几乎在所有实行统一税率的国家，政府的所得税收入都有所降低。这也解释了为什么在实行统一税率的同时往往会调高增值税率（几乎所有东欧国家都是如此）。美国共和党总统候选人赫尔曼·凯恩的“999”计划呼吁在实行9%的个人及企业税率的同时，实行9%的国家销售税率。