Proportional, Progressive, and Regressive taxes

Taxes are categorized by the effect they have on the placement of income and wealth. A proportional tax is the kind of tax that puts the same relative requirement on every taxpayer—i.e., in the case where tax liability and income move in equal scale. A progressive tax is recognised by a greater than proportional increase in the tax onus relative to the rise in income, and a regressive tax is recognisable by a less than proportional increase in the comparative liability. Therefore, progressive taxes are viewed as taking away inequalities in income distribution, while regressive taxes are believed to cause an increase in these inequalities.

The taxes that are normally regarded as progressive include individual income taxes and estate taxes. Income taxes that are nominally progressive, however, may become less so in the upper-income group—particularly if a taxpayer is allowed to lower his tax base by nominating deductions or by leaving out certain income components from his taxable income. Proportional tax rates if applied to lower-income demographics will also be more progressive if personal exemptions are declared.

Income measured over a given year might not absolutely come up with the most accurate measure of taxpaying requirements. For example, transitory increases in income can be saved, and during temporary declines in income a taxpayer could select to pay for consumption by reducing savings. Ergo, if taxation is held in comparison along with “permanent income,” it should be less regressive (or more progressive) than when it is compared with annual income.

Sales taxes and excises (with the exception of those on luxuries) are usually regressive, because the portion of one’s income consumed or spent for specific goods lowers as the amount of personal income grows. Poll taxes (also termed head taxes), calculated as a flat amount per capita, obviously are regressive.

It is hard to classify corporate income taxes and taxes on business as progressive, regressive, or proportionate, because of the lack of certainty around the ability of businesses to shift their tax expenses (see below Shifting and incidence). This difficulty of dictating who bears the tax burden is dependant fundamentally on whether a national or a subnational (that is, provincial or state) tax is being decided.

In regarding the economic effects of taxation, it is important to differentiate between several ideas of tax rates. The statutory rates will include those nominated in law; often these are marginal rates, but in some cases they are mean rates. Marginal income tax rates signify the fraction of incremental income demanded by taxation when income rises by one dollar. Therefore, if tax liability increases by 45 cents when income increases by one dollar, the marginal tax rate is 45 percent. Income tax legislation often contain graduated marginal rates—i.e., rates that grow as income rises. Careful analysis of marginal tax rates must take into account provisions other than the formal statutory rate structure. If, for example, a particular tax credit (reduction in tax) decreases by 20 cents for each one-dollar rise in income, the marginal rate is 20 percentage points more than indicated within the statutory rates. Since marginal rates signify how after-tax income changes in response to changes in before-tax income, they are the appropriate ones for considering incentive effects of taxation. It is even more difficult to nominate the marginal effective tax rate to apply to income from business and capital, since it may depend on such factors as the structure of depreciation allowances, the deductibility of interest, and the provisions for inflation adjustment. A basic economic theorem determines that the marginal effective tax rate in income from capital is nothing under a consumption-based tax.

Average income tax rates indicate the part of total income that is taken in taxation. The pattern of average rates is the one that is relevant for assessing the distributional equity of taxation. Under a progressive income tax the average income tax rate rises with income. Average income tax rates commonly rise with income, both because personal allowances are granted for the taxpayer and dependents and also due to that marginal tax rates are graduated; on the other hand, preferential treatment of income received for the most part by high-income households might dwarf these effects, forcing regressivity, as indicated by average tax rates that decrease as income grows.

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