Taxes can be distinguished by the impact they have on the allocation of income and wealth. A proportional tax is the kind that imposes the same relative burden on every taxpayer—i.e., when tax liability and income move in equal levels. A progressive tax is characterized by a higher than proportional growth in the tax burden relative to the rise in income, and a regressive tax is recognisable by a less than proportional increase in the comparable onus. Thus, progressive taxes are seen as fighting inequity in income distribution, while regressive taxes can have the result of an increase in these inequalities.

The taxes that are usually believed to be progressive include individual income taxes and estate taxes. Income taxes that are nominally progressive, however, could become less so in the upper-income categories—in particular if a taxpayer is able to lessen his tax base by nominating deductions or by taking particular income aspects from his taxable income. Proportional tax rates that are applied to lower-income demographics will also be more progressive if such personal exemptions are made.

Income measured over the period of a year does not absolutely come up with the most accurate measure of taxpaying requirements. For example, transitory rises in income may be saved, and during temporary declines in income a taxpayer might select to provide for consumption by reducing savings. So, if taxation is regarded with “permanent income,” it would be less regressive (or more progressive) than if compared with annual income.

Sales taxes and excises (save on luxuries) are usually regressive, because the portion of one’s income consumed or spent for a specific good lessens as the amount of personal income grows. Poll taxes (aka head taxes), levied as a flat amount per capita, patently are regressive.

It is not easy to dictate corporate income taxes and taxes on business as progressive, regressive, or proportionate, principally due to the lack of certainty about the ability of businesses to shift their tax expenses (see below Shifting and incidence). This difficulty of determining who bears the tax burden rests for the most part on whether a national or a subnational (that is, provincial or state) tax is being determined.

In assessing the economic purpose of taxation, it is essential to distinguish between varied ideas of tax rates. The statutory rates are those specified in the law; usually these are marginal rates, but in some cases they are average rates. Marginal income tax rates denote the fraction of incremental income taken by taxation when income is increased by one dollar. So, if tax liability rises by 45 cents when income grows by one dollar, the marginal tax rate is 45 percent. Income tax statutes often contain graduated marginal rates—i.e., rates that increase as income rises. Careful analysis of marginal tax rates are required to regard provisions as well as the formal statutory rate structure. If, for example, a particular tax credit (reduction in tax) lessens by 20 cents for each one-dollar increase in income, the marginal rate is 20 percentage points more than specified in the statutory rates. Since marginal rates specify how after-tax income moves in response to changes in before-tax income, they are the necessary ones for appraising incentive effects of taxation. It is even more complicated to know the marginal effective tax rate applicable to income from business and capital, since 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 grants that the marginal effective tax rate in income from capital is nil under a consumption-based tax.

Average income tax rates display the percentage of total income that is demanded 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 increases with income. Average income tax rates commonly increase with income, both because personal allowances are granted for the taxpayer and dependents and also because marginal tax rates are graduated; on the other side of things, preferential treatment of income received for the most part by high-income households might dwarf these effects, allowing regressivity, as displayed by average tax rates that lessen as income grows.

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