尽管非税收入可能占一国GDP总量相当大的比重，但低收入和中低收入国家的平均税收/GDP比率分别在15%和19%左右，显著低于经合组织的平均水平35 % 。
Although non-tax revenue may contribute significantly to some countries’ total GDP, the average tax/GDP ratios in low-income and lower-middle-income countries are roughly 15% and 19%, respectively – significantly lower than the OECD average of more than 35%.