Proportional, Progressive, and Regressive taxes
Taxes can be distinguished by the impact they have on the distribution of income and wealth. A proportional tax is one that impinges the same relative onus on every taxpayer—i.e., in the case where tax liability and income grow in equal scale. A progressive tax is characterizable by a greater than proportional increase in the tax liability relative to the increase in income, and a regressive tax is characterizable by a less than proportional growth in the related liability. So, progressive taxes are seen as taking away a lack of equality in income distribution, while regressive taxes can increase these inequalities.
The taxes that are generally 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 demographic—especially if a taxpayer is allowed to reduce his tax base by nominating deductions or by removing some certain income elements from his taxable income. Proportional tax rates if applied to lower-income demographics will also be more progressive if such personal exemptions are claimed.
Income measured over the period of a year might not definitely come up with the best measure of taxpaying status. For example, transitory rises in income can be saved, and within temporary declines in income a taxpayer might opt to finance consumption by reducing savings. Ergo, if taxation is held in comparison alongside “permanent income,” it will be less regressive (or more progressive) than when it is made comparable with annual income.
Sales taxes and excises (excepting those on luxuries) tend to be regressive, because the spread of own income consumed or spent for a specific good lowers as the level of personal income rises. Poll taxes (aka head taxes), calculated as a flat amount per capita, patently are regressive.
It is complicated to dictate corporate income taxes and taxes on business as progressive, regressive, or proportionate, because of the uncertainty around the ability of businesses to shift their tax expenses (see below Shifting and incidence). This difficulty of deciding who bears the tax burden rests fundamentally on whether a national or a subnational (that is, provincial or state) tax is being determined.
In analysing the economic effect of taxation, it is essential to differentiate between various points of tax rates. The statutory rates include those dictated in the legislation; usually these are marginal rates, but sometimes they are median rates. Marginal income tax rates indicate the fraction of incremental income that is demanded by taxation when income grows by one dollar. Thus, if tax liability increases by 45 cents when income grows by one dollar, the marginal tax rate is 45 percent. Income tax legislature often contain graduated marginal rates—i.e., rates that increase as income rises. Structured analysis of marginal tax rates must review provisions apart from the formal statutory rate structure. If, for example, a particular tax credit (reduction in tax) reduces by 20 cents for each one-dollar rise in income, the marginal rate is 20 percentage points more than specified within the statutory rates. Since marginal rates specify how after-tax income is changed in response to changes in before-tax income, they are the appropriate ones for regarding incentive effects of taxation. It is even more difficult to nominate the marginal effective tax rate to apply to income from business and capital, because 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 grants that the marginal effective tax rate in income from capital is nothing under a consumption-based tax.
Average income tax rates show the part of total income that is taken in taxation. The pattern of average rates is the one that is important for considering the distributional equity of taxation. Under a progressive income tax the average income tax rate rises with income. Average income tax rates commonly increase with income, both because personal allowances are provided for the taxpayer and dependents and due to that marginal tax rates are graduated; on the other hand, preferential treatment of income received predominantly by high-income households can swamp these effects, allowing regressivity, as displayed by average tax rates that decline as income grows.
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