Milton Friedman’s negative income tax proposal would have scrapped the American welfare system and replaced it with a single cash payment delivered through the IRS: anyone whose income fell below a set threshold would automatically receive money from the government instead of paying it. He laid the idea out in his 1962 book Capitalism and Freedom, arguing that one streamlined program could fight poverty more effectively than the patchwork of overlapping agencies then in place.1National Bureau of Economic Research. The Negative Income Tax and the Evolution of U.S. Welfare Policy The proposal never became law, but it shaped decades of policy debate and directly influenced the Earned Income Tax Credit enacted in 1975.
How the Payment Would Have Worked
The mechanics are simpler than the name suggests. Under the regular income tax, you earn money and pay a percentage to the government. Under a negative income tax, that flow reverses for people earning below a threshold: the government pays them. The same tax system handles both directions, and the IRS decides who owes and who receives based on reported income alone.
Friedman proposed that beneficiaries would file annual or possibly quarterly income returns with the IRS, just like any other taxpayer. Instead of a separate welfare application, a food-stamp office, or an eligibility interview, the tax return itself would trigger the payment.
Two numbers define the whole system. The break-even point is the income level where you neither owe taxes nor receive a subsidy. The negative tax rate is the percentage applied to the gap between your earnings and that break-even point. Every household’s payment flows from those two figures.
A Worked Example
A commonly discussed version uses a 50 percent negative tax rate.2Harvard Journal on Legislation. The Negative Income Tax: Accounting Problems and a Proposed Solution Suppose the break-even point is $30,000. A person with zero income has a $30,000 gap, and 50 percent of that gap is $15,000. That is the maximum payment.
Now suppose that person takes a job paying $10,000. The gap shrinks to $20,000, the subsidy falls to $10,000, and total income reaches $20,000. Earn $20,000 in wages and the subsidy drops to $5,000, for a total of $25,000. At $30,000 in wages the subsidy disappears entirely and the person begins paying regular income taxes.
Total income always rises as earnings rise. Every extra dollar of wages costs only fifty cents in lost subsidy, so working more always pays. Policymakers can adjust either number without reworking the underlying system.
Why Friedman Wanted It to Replace Welfare
Friedman did not propose the negative income tax as an add-on. He wanted it to replace all existing means-tested assistance: food stamps, public housing, cash welfare, and every other benefit program.1National Bureau of Economic Research. The Negative Income Tax and the Evolution of U.S. Welfare Policy His argument was part economic, part philosophical. Multiple agencies managing overlapping benefits created heavy administrative costs and subjected recipients to intrusive oversight of how they spent their assistance.
SNAP runs through the Department of Agriculture. Section 8 housing vouchers run through HUD and roughly 2,000 local housing agencies.3U.S. Department of Housing and Urban Development. Housing Choice Voucher Tenants Each program has its own application, its own eligibility rules, its own bureaucracy. If the goal is to help people who do not have enough money, Friedman argued, give them money and let them decide how to spend it.
The consolidation argument also had a mathematical edge. When a low-income family participates in several benefit programs at once, each one reducing benefits as income rises, the stacked effect can push effective marginal tax rates far above what the negative income tax would allow. Keeping a single 50 percent rate was meant to preserve work incentives, and stacking programs on top of each other created the same disincentive through the back door.1National Bureau of Economic Research. The Negative Income Tax and the Evolution of U.S. Welfare Policy
Solving the Welfare Cliff
The strongest selling point was how the design handled the transition from receiving benefits to earning a living. Many traditional welfare programs cut off benefits entirely once a recipient’s income crosses a line. A single parent earning $18,000 might collect $6,000 in combined benefits, but earning $19,000 could disqualify them from the program and leave them worse off for having earned more. Economists call this the welfare cliff.
Friedman’s design eliminates the cliff by construction. Because the subsidy shrinks gradually rather than vanishing at a threshold, there is no income level where earning an extra dollar makes you poorer. The negative tax rate itself becomes the policy lever: set it too high and the work incentive weakens; set it too low and the maximum payment for someone with no income becomes inadequate. Finding the right balance was the central design problem.
What the 1970s Experiments Found
The proposal did not stay theoretical. Starting in 1968, the federal government ran a series of large-scale field experiments to test how a guaranteed income with a gradual phase-out would actually change behavior. The first began in New Jersey, run by Mathematica with research support from the University of Wisconsin’s Institute for Research on Poverty. Additional experiments followed in rural Iowa and North Carolina, in Gary, Indiana, and, most ambitiously, in Seattle and Denver.
The New Jersey Income Maintenance Experiment ran from 1968 to 1972 and focused on low-income urban families. Participants below the break-even point reduced their work hours by roughly 16 percent compared to a control group.4National Bureau of Economic Research. The New Jersey Income Maintenance Experiment The larger driver of the reduction was not the guarantee itself but the benefit-reduction rate, which effectively taxed additional earnings.
The Seattle-Denver Income Maintenance Experiment, known as SIME/DIME, was larger and ran longer. Its findings were more sobering. Husbands cut their work hours by about 9 percent overall; wives cut theirs by about 20 percent. Young men in the experiment reduced reported hours by about 24 percent, and for those still living at home the decline reached 43 percent.5U.S. Department of Health and Human Services. Overview of the Final Report of the Seattle-Denver Income Maintenance Experiment
The finding that drew the most political attention had nothing to do with hours worked. Early analysis of the SIME/DIME data suggested the negative income tax increased divorce rates, with pooled data showing roughly a 16 percent rise over the control group.6Institute of Labor Economics. What Did We Learn from the North American Income Maintenance Experiments Later reanalysis complicated that story. When Seattle and Denver were analyzed separately, the divorce effect appeared only in the Seattle sample, where randomization may not have been properly achieved, and Canada’s parallel Mincome experiment found no increase in divorce. By the time these reanalyses appeared, the political damage was done.
Nixon’s Family Assistance Plan
The negative income tax came closest to becoming law under Richard Nixon. In 1969, his administration proposed the Family Assistance Plan, a guaranteed income for families with children. A family of four with no other income would receive a maximum benefit of $1,600 per year. The first $720 of earnings would not reduce the benefit, and above that threshold, every additional dollar of income would reduce the payment by fifty cents, producing a break-even point of $3,920 for a family of four.7Institute for Research on Poverty. Nixon’s Family Assistance Plan
The plan included a work requirement: every able-bodied adult working less than full-time had to register with the state employment service, including mothers whose youngest child was older than six. Families with assets exceeding $1,500, beyond a home and essential property, were ineligible.7Institute for Research on Poverty. Nixon’s Family Assistance Plan
The plan satisfied almost nobody. Conservatives objected to a guaranteed income on principle. Liberals considered $1,600 grossly inadequate, pointing out that existing welfare benefits in many states already exceeded that amount. The Family Assistance Plan passed the House but died in the Senate Finance Committee, and no later administration revived it in that form.
Why the Proposal Never Became Law
The idea drew intellectual support across the political spectrum, and it still never passed. Several problems combined to kill it.
The Impossible Triangle
The most damaging critique was structural. It is essentially impossible to design a negative income tax that simultaneously provides a generous income floor, maintains a low enough tax rate to preserve work incentives, and keeps the program’s cost within manageable limits. Raise the guaranteed income and you either push the break-even point so high that a large share of the population qualifies, or you raise the negative tax rate and weaken the work incentive that was the program’s central appeal. Every concrete proposal disappointed someone.
The Experimental Results
The 1970s experiments were supposed to build the case for adoption. Instead, the SIME/DIME findings of 9 to 20 percent reductions in work hours, together with the initial divorce results, gave opponents ammunition.5U.S. Department of Health and Human Services. Overview of the Final Report of the Seattle-Denver Income Maintenance Experiment The marital stability finding had, as one researcher put it, a bigger political effect than the labor supply results the experiments were actually designed to measure.6Institute of Labor Economics. What Did We Learn from the North American Income Maintenance Experiments
Competition From the Existing Welfare System
By the time serious legislative proposals emerged, the existing welfare system had grown to provide a package of cash and in-kind benefits that, in many states, exceeded any plausible negative income tax guarantee. Replacing those benefits with a smaller cash payment would have meant cutting support for current recipients, which was politically toxic regardless of the long-term efficiency argument.
Reporting, Fraud, and Marriage Penalties
A more mundane problem involved how often to measure income. Annual measurement, as with the regular tax system, meant a family that lost its income in January would wait months for help. Monthly measurement improved responsiveness but pushed costs and caseloads up, since many households experience temporary income dips that annual averaging smooths out. The experiments also revealed significant underreporting of income, raising fraud concerns at scale.
And any income-based program using household filing creates a potential marriage penalty. Two single people receiving subsidies who marry and file jointly may see their combined income cross the break-even point, reducing or eliminating the payment they would have collected separately. Designing an NIT that treats married and unmarried households equitably proved to be another constraint with no clean solution.
What Survived: The Earned Income Tax Credit
Although the negative income tax itself never became law, it directly inspired what is now the largest cash-transfer program for working Americans. The Earned Income Tax Credit was enacted on a temporary basis as part of the Tax Reduction Act of 1975, influenced by the negative income tax concept and by Nixon’s failed Family Assistance Plan.8Congressional Research Service. The Earned Income Tax Credit (EITC): Legislative History The Senate Finance Committee described its objective as encouraging employment, reducing unemployment, and shrinking the welfare rolls.
The EITC borrows the negative income tax’s core mechanism of delivering benefits through the tax code, but it differs in one fundamental way: it only helps people who work. Under the EITC, workers receive a credit equal to a percentage of their earnings, and the credit grows as they earn more, up to a maximum, before phasing out gradually as income continues to rise.9Office of the Law Revision Counsel. 26 USC 32 – Earned Income Under Friedman’s negative income tax, by contrast, the maximum payment goes to someone with zero income. A person who earns nothing gets nothing from the EITC but would receive the largest subsidy under an NIT.
The EITC is, in a sense, half of Friedman’s idea. It uses the tax code to deliver cash to low-income households and phases out gradually to preserve work incentives. But by requiring earned income, it excludes the very poorest people who cannot work at all, the exact group the negative income tax was designed to reach first.
How It Differs From Universal Basic Income
The negative income tax is sometimes confused with universal basic income, and the two do share a goal of ensuring nobody falls below a minimum income level. They get there differently. A UBI sends the same payment to every person regardless of income, with the government recouping it from higher earners through the regular tax system. A negative income tax only sends payments to people below the break-even point; the means-testing happens on the front end when a return is filed.
If the rates and thresholds are set correctly, the two systems can produce identical net outcomes for every household. The difference is administrative. Under a UBI, vastly more money passes through government hands since everyone receives a payment and higher earners pay it back in taxes. Under an NIT, the government only moves money toward people who need it. Friedman considered that efficiency a major advantage.
The tradeoff is timing. A UBI payment arrives whether or not you have filed taxes, which matters when someone loses a job in February and cannot wait until April for the tax system to catch up. Friedman acknowledged this by suggesting quarterly filings, but the lag between income loss and payment delivery remained a real limitation of the tax-code approach.