Taxes can be categorized by the effect they have on the placement of income and wealth. A proportional tax is the kind that applies the same relative burden on all taxpayers—i.e., where tax liability and income increase in the same scale. A progressive tax is characterizable by a higher than proportional increase in the tax liability in relation to the rise in income, and a regressive tax is characterizable by a less than proportional increase in the comparative burden. Therefore, progressive taxes are regarded as fighting a lack of equality in income distribution, whereas regressive taxes are found to have the effect of increasing these inequalities.
The taxes that are generally considered progressive include individual income taxes and estate taxes. Income taxes that are initially progressive, however, may become less so for the upper-income class—particularly if a taxpayer is allowed to lower his tax base by claiming deductions or by removing certain income aspects from his taxable income. Proportional tax rates when applied to lower-income categories will also be more progressive if exemptions of a personal nature are made.
Income measured over the period of a year might not necessarily come up with the most accurate measure of taxpaying status. For example, transitory growth in income can be saved, and in temporary declines in income a taxpayer may elect to finance consumption by reducing savings. Ergo, if taxation is regarded along with “permanent income,” it will be less regressive (or more progressive) than if it is held in comparison with annual income.
Sales taxes and excises (except those on luxuries) are mostly regressive, because the share of personal income consumed or spent for specific goods lowers as the level of personal income rises. Poll taxes (also known as head taxes), calculated as a fixed amount per capita, clearly are regressive.
It is difficult to term corporate income taxes and taxes on business as progressive, regressive, or proportionate, due to the uncertainty surrounding the ability of businesses to shift their tax expenses (see below Shifting and incidence). This difficulty of determining who bears the tax burden lays crucially on whether a national or a subnational (that is, provincial or state) tax is being decided.
In assessing the economic effects of taxation, it is relevant to differentiate between several points of tax rates. The statutory rates are dictated in the legislation; usually these are marginal rates, but in some cases they are median rates. Marginal income tax rates signify the fraction of incremental income taken by taxation when income is increased by one dollar. Hence, if tax onus increases by 45 cents when income rises by one dollar, the marginal tax rate is 45 percent. Income tax legislature often contain graduated marginal rates—i.e., rates that rise as income increases. Heavy analysis of marginal tax rates need to review provisions other than the formal statutory rate structure. If, for example, a particular tax credit (reduction in tax) declines by 20 cents for each one-dollar rise in income, the marginal rate is 20 percentage points higher than specified within the statutory rates. Since marginal rates specify how after-tax income increases or decreases in response to changes in before-tax income, they are the necessary ones for assessing incentive effects of taxation. It is even more difficult to understand the marginal effective tax rate to apply to income from business and capital, as it may rely on considerations including 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 nil under a consumption-based tax.
Average income tax rates display the part of total income that is required in taxation. The pattern of average rates is the one that is necessary for appraising the distributional equity of taxation. Under a progressive income tax the average income tax rate grows with income. Average income tax rates commonly rise with income, both because personal allowances are provided for the taxpayer and dependents and due to that marginal tax rates are graduated; conversely, preferential treatment of income received predominantly by high-income households could dwarf these effects, producing regressivity, as displayed by average tax rates that lessen as income rises.
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