Proportional, Progressive, and Regressive taxes

Taxes can be categorized by the impact they have on the allocation of income and wealth. A proportional tax is a kind that places the same relative requirement on all the taxpayers—i.e., in the case where tax liability and income move in relative scale. A progressive tax is characterizable by a higher than proportional rise in the tax liability in relation to the increase in income, and a regressive tax is characterizable by a less than proportional rise in the relative onus. So, progressive taxes are thought of as removing the lack of equality in income distribution, but regressive taxes are seen to result in increasing these inequalities.

The taxes that are generally thought to be progressive include individual income taxes and estate taxes. Income taxes that are declarably progressive, however, may become less so within the upper-income group—especially if a taxpayer is able to reduce his tax base by claiming deductions or by excluding some particular income elements from his taxable income. Proportional tax rates which are applied to lower-income groups can also be more progressive if such personal exemptions are claimed.

Income measured over the course of a given year does not necessarily offer the most suitable measure of taxpaying requirement. For example, transitory increases in income may be saved, and during temporary declines in income a taxpayer might opt to pay for consumption by decreasing savings. So, if taxation is compared with “permanent income,” it will be less regressive (or more progressive) than when compared with annual income.

Sales taxes and excises (save those on luxuries) tend to be regressive, because the portion of personal income consumed or spent for specific goods declines as the amount of personal income grows. Poll taxes (also known as head taxes), nominated as a flat amount per capita, patently are regressive.

It is difficult to term corporate income taxes and taxes on business as progressive, regressive, or proportionate, because of the uncertainty regarding the ability of businesses to shift their tax expenses (see below Shifting and incidence). This difficulty of deciding who bears the tax burden is dependant for the most part on whether a national or a subnational (that is, provincial or state) tax is being considered.

In considering the economic effects of taxation, it is relevant to distinguish between varied concepts of tax rates. The statutory rates will include those specified in legislature; generally these are marginal rates, but in some cases they are average rates. Marginal income tax rates note the fraction of incremental income that is taken by taxation when income increases by one dollar. Ergo, if tax liability increases by 45 cents when income increases by one dollar, the marginal tax rate is 45 percent. Income tax legislation usually contain graduated marginal rates—i.e., rates that grow as income increases. Heavy analysis of marginal tax rates should take into account provisions other than the formal statutory rate structure. If, for example, a particular tax credit (reduction in tax) reduces by 20 cents for each one-dollar increase in income, the marginal rate is 20 percentage points greater than nominated in the statutory rates. Since marginal rates signify how after-tax income is changed in response to changes in before-tax income, they are the appropriate ones for assessing incentive effects of taxation. It is even more difficult to understand the marginal effective tax rate applicable to income from business and capital, because it may depend on factors including the structure of depreciation allowances, the deductibility of interest, and the provisions for inflation adjustment. A basic economic theorem holds that the marginal effective tax rate in income from capital is nil under a consumption-based tax.

Average income tax rates determine the portion of total income that is paid in taxation. The pattern of average rates is the one that is important for appraising the distributional equity of taxation. Under a progressive income tax the average income tax rate increases with income. Average income tax rates commonly rise with income, both because personal allowances are granted for the taxpayer and dependents and due to that marginal tax rates are graduated; on the other side of things, preferential treatment of income received predominantly by high-income households can swamp these effects, producing regressivity, as displayed by average tax rates that decrease as income grows.

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