A regressive tax is a tax imposed in such a manner that the tax rate decreases as the amount subject to taxation increases. "Regressive" describes a distribution effect on income or expenditure, referring to the way the rate progresses from high to low, so that the average tax rate exceeds the marginal tax rate. In terms of individual income and wealth, a regressive tax imposes a greater burden (relative to resources) on the poor than on the rich: there is an inverse relationship between the tax rate and the taxpayer's ability to pay, as measured by assets, consumption, or income. These taxes tend to reduce the tax burden of the people with a higher ability to pay, as they shift the relative burden increasingly to those with a lower ability to pay.
The regressivity of a particular tax can also factor the propensity of the taxpayers to engage in the taxed activity relative to their resources (the demographics of the tax base). In other words, if the activity being taxed is more likely to be carried out by the poor and less likely to be carried out by the rich, the tax may be considered regressive. To measure the effect, the income elasticity of the good being taxed as well as the income effect on consumption must be considered. The measure can be applied to individual taxes or to a tax system as a whole; a year, multi-year, or lifetime.
The opposite of a regressive tax is a progressive tax, in which the average tax rate increases as the amount subject to taxation rises. In between is a flat or proportional tax, where the tax rate is fixed as the amount subject to taxation increases.
Poll taxes
Lump-sum tax
A tax with a cap, above which no taxes are paid, such as the American Social Security Tax, which does not apply to wages over an annual limit.
So-called "sin taxes" (pigovian taxes) have also been criticized for being regressive, as they are often consumed more (or at least at a greater proportion) by the poor. Such taxes are often imposed at a flat rate so they will make up a greater proportion of the final price of cheaper brands, compared to the higher-quality products generally consumed by the wealthy.