Proportional, Progressive, and Regressive taxes
July 8th, 2010
Taxes can be distinguished by the effect they have on the distribution of income and wealth. A proportional tax is the kind of tax that places the same relative requirement on all the taxpayers—i.e., where tax liability and income move in equal proportion. A progressive tax is recognisable by a larger than proportional rise in the tax burden in relation to the increase in income, and a regressive tax is recognisable by a less than proportional rise in the comparable onus. Ergo, progressive taxes are thought of as removing inequity in income distribution, whereas regressive taxes are believed to result in an increase these inequalities.
The taxes that are usually believed to be progressive include individual income taxes and estate taxes. Income taxes that are categorically progressive, however, could become less so within the upper-income categories—especially if a taxpayer is able to lower his tax base by nominating deductions or by taking certain income aspects from his taxable income. Proportional tax rates if applied to lower-income categories can also be more progressive if such personal exemptions are made.
Income measured over the period of a year may not absolutely give the most appropriate measure of taxpaying ability. For example, transitory increases in income may be saved, and within temporary declines in income a taxpayer may choose to finance consumption by reducing savings. So, if taxation is held in comparison alongside “permanent income,” it will be less regressive (or more progressive) than if it is compared with annual income.
Sales taxes and excises (excepting luxuries) are generally regressive, because the spread of own income consumed or spent on specific goods lessens as the rate of personal income is raised. Poll taxes (also termed head taxes), nominated as a flat amount per capita, patently are regressive.
It is not simple to dictate corporate income taxes and taxes on business as progressive, regressive, or proportionate, principally because of the uncertainty regarding the ability of businesses to shift their tax expenses (see below Shifting and incidence). This difficulty of nominating 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 analysing the economic purposes of taxation, it is necessary to differentiate between varied ideas of tax rates. The statutory rates are specified in legislature; generally speaking these are marginal rates, but sometimes they are average rates. Marginal income tax rates signify the fraction of incremental income that is demanded by taxation when income is increased by one dollar. Hence, if tax onus increases by 45 cents when income grows by one dollar, the marginal tax rate is 45 percent. Income tax statutes usually contain graduated marginal rates—i.e., rates that increase as income rises. Careful analysis of marginal tax rates are required to regard provisions in addition to the formal statutory rate structure. If, for example, a particular tax credit (reduction in tax) lessens by 20 cents for each one-dollar rise in income, the marginal rate is 20 percentage points higher than indicated by the statutory rates. Since marginal rates display how after-tax income is changed in response to changes in before-tax income, they are the relevant ones for assessing incentive effects of taxation. It is even more complicated to nominate the marginal effective tax rate applied to income from business and capital, since 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 fraction of total income that is taken in taxation. The pattern of average rates is the one that is important for judging the distributional equity of taxation. Under a progressive income tax the average income tax rate increases with income. Average income tax rates usually rise with income, both because personal allowances are permitted 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 could dwarf these effects, forcing regressivity, as shown by average tax rates that decline as income grows.
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