Proportional, Progressive, and Regressive taxes
Taxes are distinguished by the impact they have on the distribution of income and wealth. A proportional tax is a kind that imposes the same relative burden on all the taxpayers—i.e., in the case where tax liability and income grow in relative proportion. A progressive tax is recognised by a greater than proportional increase in the tax burden relative to the increase in income, and a regressive tax is recognised by a less than proportional growth in the related onus. Therefore, progressive taxes are thought of as fighting the lack of equality in income distribution, while regressive taxes may result in an increase these inequalities.
The taxes that are generally regarded as progressive include individual income taxes and estate taxes. Income taxes that are declarably progressive, however, might become less so for the upper-income categories—especially if a taxpayer is permitted to lessen his tax base by claiming deductions or by taking particular income components from his taxable income. Proportional tax rates when applied to lower-income categories will also be more progressive if such exemptions of a personal nature are claimed.
Income measured over the course of a given year does not definitely come up with the most accurate measure of taxpaying status. For example, transitory rises in income can be saved, and within temporary declines in income a taxpayer could opt to finance consumption by taking from savings. Therefore, if taxation is held in comparison alongside “permanent income,” it should be less regressive (or more progressive) than if it is made comparable with annual income.
Sales taxes and excises (excepting luxuries) are mostly regressive, because the portion of one’s income consumed or spent on specific goods lowers as the rate of personal income increases. Poll taxes (also called head taxes), nominated as a flat amount per capita, obviously are regressive.
It is complicated to classify corporate income taxes and taxes on business as progressive, regressive, or proportionate, principally because of the lack of certainty regarding the ability of businesses to shift their tax expenses (see below Shifting and incidence). This difficulty of dictating who bears the tax burden lays fundamentally on whether a national or a subnational (that is, provincial or state) tax is being decided.
In regarding the economic purposes of taxation, it is necessary to distinguish between various ideas of tax rates. The statutory rates are specified in legislation; often these are marginal rates, but in some cases they are average rates. Marginal income tax rates signify the fraction of incremental income taken by taxation when income rises by one dollar. Thus, if tax burden grows by 45 cents when income grows by one dollar, the marginal tax rate is 45 percent. Income tax legislature usually contain graduated marginal rates—i.e., rates that rise as income rises. Heavy analysis of marginal tax rates must consider provisions apart from the formal statutory rate structure. If, for example, a particular tax credit (reduction in tax) lessens by 20 cents for each one-dollar growth in income, the marginal rate is 20 percentage points higher than indicated by the statutory rates. Since marginal rates signify how after-tax income increases or decreases in response to changes in before-tax income, they are the appropriate ones for considering incentive effects of taxation. It is even more complicated to know the marginal effective tax rate applied to income from business and capital, since it may be dependant on factors such as the structure of depreciation allowances, the deductibility of interest, and the provisions for inflation adjustment. A basic economic theorem grants that the marginal effective tax rate in income from capital is zero under a consumption-based tax.
Average income tax rates indicate the percentage of total income that is required in taxation. The pattern of average rates is the one that is relevant for considering the distributional equity of taxation. Under a progressive income tax the average income tax rate increases with income. Average income tax rates usually increase with income, both because personal allowances are provided for the taxpayer and dependents and also because marginal tax rates are graduated; conversely, preferential treatment of income received predominantly by high-income households may dwarf these effects, allowing regressivity, as shown by average tax rates that decrease as income rises.
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