Taxes are categorized by the effect they have on the placement of income and wealth. A proportional tax is a tax that applies the same relative burden on all taxpayers—i.e., in the case where tax liability and income move in equal levels. A progressive tax is characterizable by a greater than proportional rise in the tax onus in relation to the increase in income, and a regressive tax is characterized by a less than proportional rise in the comparable burden. Hence, progressive taxes are seen as removing the lack of equality in income distribution, while regressive taxes are believed to have the effect of increasing these inequalities.
The taxes that are generally believed to be progressive include individual income taxes and estate taxes. Income taxes that are declarably progressive, however, may become less so within the upper-income class—in particular if a taxpayer is able to lessen his tax base by claiming deductions or by leaving out some particular income parts from his taxable income. Proportional tax rates when applied to lower-income classes would also be more progressive if such exemptions of a personal nature are claimed.
Income measured over the course of a given year might not definitely provide the most suitable measure of taxpaying status. For example, transitory growth in income could be saved, and during temporary declines in income a taxpayer could choose to provide for consumption by reducing savings. Ergo, if taxation is made comparable with “permanent income,” it can be less regressive (or more progressive) than if it is made comparable with annual income.
Sales taxes and excises (with the exception of those on luxuries) are generally regressive, because the spread of one’s income consumed or spent on specific goods decreases as the rate of personal income increases. Poll taxes (also termed head taxes), levied as a fixed amount per capita, obviously are regressive.
It is complicated to term corporate income taxes and taxes on business as progressive, regressive, or proportionate, principally because of 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 depends for the most part on whether a national or a subnational (that is, provincial or state) tax is being determined.
In regarding the economic effect of taxation, it is important to differentiate between various concepts of tax rates. The statutory rates are those dictated in law; commonly these are marginal rates, but occasionally they are median rates. Marginal income tax rates denote the fraction of incremental income that is taken by taxation when income rises by one dollar. Ergo, if tax onus grows by 45 cents when income rises by one dollar, the marginal tax rate is 45 percent. Income tax regulations often contain graduated marginal rates—i.e., rates that increase as income increases. Structured analysis of marginal tax rates must consider provisions apart from the formal statutory rate structure. If, for example, a particular tax credit (reduction in tax) decreases by 20 cents for each one-dollar increase in income, the marginal rate is 20 percentage points more than nominated within 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 appraising incentive effects of taxation. It is even more complicated to nominate the marginal effective tax rate to apply to income from business and capital, since it may be reliant 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 zero under a consumption-based tax.
Average income tax rates show the fraction of total income that is demanded in taxation. The pattern of average rates is the one that is in consideration 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 increase with income, both because personal allowances are permitted for the taxpayer and dependents and also because marginal tax rates are graduated; on the flip side, preferential treatment of income received mostly by high-income households may dwarf these effects, allowing regressivity, as shown by average tax rates that fall as income grows.
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