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Negative income tax

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Negative income tax

In economics, a negative income tax (NIT) is a system which reverses the direction in which tax is paid for incomes below a certain level; in other words, earners above that level pay money to the state while earners below it receive money. NIT was proposed by British writer and politician Juliet Rhys-Williams while working on the Beveridge Report in the early 1940s and popularized by American economist Milton Friedman in the 1960s as a system in which the state makes payments to poor people when their income falls below a threshold, while taxing them on income above that threshold.

Together with Friedman, supporters of NIT also included James Tobin, Joseph A. Pechman, Jim Gray and even then-President Richard Nixon, who suggested implementation of modified NIT in his Family Assistance Plan. After the increase in popularity of NIT, an experiment sponsored by the US government was conducted between 1968 and 1982 on effects of NIT on labour supply, income, and substitution effects.

The view that the state should supplement the income of the poor has a long history (see Universal basic income § History). Such payments are called benefits if they are limited to those who lack other income, or are conditional on specific needs (such as number of children), but are called negative taxes if they continue to be received as a supplement by workers who have income from other sources. The withdrawal of benefits when the recipient ceases to satisfy a firm eligibility criterion is often seen as giving rise to the welfare trap.

The level of support provided to the poor by a negative tax is thought of as parametrically adjustable according to the opposing claims of economic efficiency and distributional justice. Friedman's NIT lacks this adjustability owing to the constraint that other benefits would be largely discontinued; hence a wage subsidy is more representative of generic negative income tax than is Friedman's specific Negative Income Tax.

In 1975 the United States implemented a negative income tax for the working poor through the earned income tax credit. A 1995 survey found that 78% of American economists supported (with or without provisos) the incorporation of a negative income tax into the welfare system.

Theoretical discussion of negative taxation began with Vilfredo Pareto, who first made a formal distinction between allocative efficiency (i.e. the market's ability to give people what they want subject to their incomes) and distributive justice (i.e. the question of whether these incomes are fair in the first place). He sought to show that market economies allocated resources optimally within the income distributions they give rise to, but accepted that there was nothing optimal about these distributions themselves. He concluded that if society wished to maximise wellbeing, it should let market forces govern production and exchange and then correct the result by 'a second distribution... performed in conformity with the workings of free competition'. His argument was that a direct transfer obtained a given redistributive effect with the least possible reduction of economic efficiency, and was preferable to government interference in the market (as happens in modern economies through the minimum wage) which damages efficiency by introducing distortions.

Abram Bergson and Paul Samuelson (drawing on earlier work by Oscar Lange) gave a formal statement to Pareto's claims. They showed that the optimum of efficiency associated with market competition fell short of maximum wellbeing as reflected by a social welfare function only through distributional effects, and that a true optimum could be obtained if the state were to transfer income through 'lump sum taxes or bounties', where 'bounties' are negative taxes and 'lump sum' is Samuelson's term for a hypothetical redistribution with no distortionary consequences.

It follows from the Bergson/Samuelson analysis that any proposed measure (including the proposal to leave things as they are) can be assessed according to the balance it achieves between three factors: (i) the improvement in overall wellbeing from a more equitable distribution; (ii) the loss in economic efficiency due to the distortions introduced; and (iii) the administrative costs. The first of these cannot easily be equated to a sum of money; the last is unlikely to be a dominant factor. Hence redistribution should be pursued up to the point at which any further (non-monetary) benefits from a more equal distribution would be offset by the resulting monetary loss of economic efficiency.

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