TCAM

Taxes are differentiated by the impact they have on the allocation of income and wealth. A proportional tax is the kind that applies the same relative requirement on all the taxpayers—i.e., where tax liability and income move in relative scale. A progressive tax is characterized by a larger than proportional growth in the tax onus in relation to the rise in income, and a regressive tax is characterizable by a less than proportional rise in the relative burden. Therefore, progressive taxes are regarded as removing the lack of equality in income distribution, whereas regressive taxes may result in increasing these inequalities.

The taxes that are normally regarded as progressive include individual income taxes and estate taxes. Income taxes that are categorically progressive, however, may become less so for the upper-income group—particularly if a taxpayer is permitted to lessen his tax base by claiming deductions or by leaving out some particular income aspects from his taxable income. Proportional tax rates if applied to lower-income groups would also be more progressive if such exemptions of a personal nature are claimed.

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

Sales taxes and excises (with the exception of those on luxuries) are generally regressive, because the dissemination of individual income consumed or spent for specific goods declines as the level of personal income grows. Poll taxes (aka head taxes), nominated as a flat amount per capita, clearly are regressive.

It is complicated to dictate corporate income taxes and taxes on business as progressive, regressive, or proportionate, due to the uncertainty 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 essentially on whether a national or a subnational (that is, provincial or state) tax is being determined.

In assessing the economic purposes of taxation, it is relevant to distinguish between varied concepts of tax rates. The statutory rates include those specified in law; commonly these are marginal rates, but occasionally they are average rates. Marginal income tax rates note the fraction of incremental income taken by taxation when income increases by one dollar. Hence, if tax onus grows by 45 cents when income increases by one dollar, the marginal tax rate is 45 percent. Income tax legislature commonly contain graduated marginal rates—i.e., rates that increase as income increases. Heavy analysis of marginal tax rates are required to review provisions in addition to the formal statutory rate structure. If, for example, a particular tax credit (reduction in tax) declines 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 increases or decreases in response to changes in before-tax income, they are the relevant ones for considering incentive effects of taxation. It is even more difficult to realise the marginal effective tax rate applicable to income from business and capital, because it may be reliant 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 show the percentage of total income that is required in taxation. The pattern of average rates is the one that is necessary 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 provided for the taxpayer and dependents and also due to that marginal tax rates are graduated; on the other side of things, preferential treatment of income received mostly by high-income households may dampen these effects, allowing regressivity, as signified by average tax rates that fall as income grows.

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