A negative income tax is a system in which the government pays cash to people whose earnings fall below a set threshold instead of collecting taxes from them. Milton Friedman popularized the idea in his 1962 book Capitalism and Freedom, proposing it as a single, streamlined replacement for the patchwork of welfare programs. The United States has never adopted a pure version, but the Earned Income Tax Credit runs on the same core principle: people who earn below a certain level receive money through the tax system rather than paying into it. For 2026, the EITC can put up to roughly $8,231 back into a working family’s pocket.
How the Formula Works
Every version of a negative income tax rests on two numbers: a break-even income level and a subsidy rate. The break-even point is where your tax bill hits exactly zero. Below that line, the government pays you. Above it, you pay the government. The subsidy rate sets how big the payment is.
The math is simple. Take the break-even income, subtract what you actually earned, and multiply the gap by the subsidy rate. If the break-even is $40,000 and the subsidy rate is 50 percent, a person earning $10,000 has a $30,000 gap. Half of that gap is $15,000, so the government sends a $15,000 payment. That person ends the year with $25,000 in total income. Someone earning nothing gets the maximum payment of $20,000. Someone earning $40,000 gets nothing and starts paying positive taxes on income above that mark.
Written as an equation: Benefit = (Break-even income − Earned income) × Subsidy rate. Every economist who has proposed a negative income tax uses some version of this formula, though they disagree on what the break-even level and rate should be.
Why the Sliding Scale Matters
The defining feature of a negative income tax is that every dollar you earn always leaves you better off. Traditional welfare programs often cut benefits abruptly once your income crosses a threshold. You might lose $5,000 in housing assistance by earning an extra $1,000, ending up worse off for working more. Economists call this the “welfare cliff,” and it creates a rational reason to avoid raises or extra hours.
Under a negative income tax, the benefit shrinks gradually as earnings rise. With a 50 percent subsidy rate, an extra dollar earned reduces your payment by only 50 cents, so you still come out 50 cents ahead. You never face a situation where working more costs you money. This gradual phase-out was the central selling point of Friedman’s original proposal: it preserves the financial incentive to work at every income level.
What the U.S. Experiments Found
Between 1968 and 1978, the federal government funded four large-scale experiments to see how a negative income tax would work in practice. These took place in New Jersey and Pennsylvania (1968–1972), rural areas of North Carolina and Iowa (1970–1972), Gary, Indiana (1971–1974), and Seattle and Denver (1970–1978). Collectively, the experiments enrolled roughly 8,700 families at various income levels and subsidy rates.1Bureau of Labor Statistics. The Negative Income Tax: Would It Discourage Work?
The results were mixed. Hours worked did decline, but for most groups the reduction was modest. Husbands reduced their work hours by roughly 1 to 8 percent. The effects on wives varied widely, from near zero to over 50 percent at some sites, though some of that variation was later attributed to income underreporting rather than genuine work reduction. Female heads of household showed reductions of about 9 to 28 percent depending on the site and how the data was adjusted.1Bureau of Labor Statistics. The Negative Income Tax: Would It Discourage Work?
The work-reduction findings, particularly the larger numbers for wives and single mothers, gave opponents enough ammunition to stall congressional action. No pure negative income tax bill passed. Instead, the political energy shifted toward expanding the Earned Income Tax Credit, which requires work as a condition of receiving any payment.
How the EITC Works as a Negative Income Tax
The Earned Income Tax Credit, established under 26 U.S.C. § 32, is the closest thing to a functioning negative income tax in the United States.2Office of the Law Revision Counsel. 26 USC 32 – Earned Income It runs through the same tax infrastructure Friedman envisioned. You file a return, the IRS calculates what you owe or what you’re owed, and the payment shows up as a refund. The credit is fully refundable, meaning you receive cash even if you paid nothing in federal income tax during the year.
Where the EITC diverges from a pure negative income tax is in its structure. Rather than a single straight-line formula, the EITC has a phase-in range where the credit grows as you earn more, a flat plateau, and then a phase-out range where the credit shrinks. It ties credit amounts to the number of qualifying children in your household, creating different benefit schedules for different family sizes. And crucially, you must have earned income to receive anything. A person with zero earnings gets zero credit, unlike Friedman’s model, where zero-income households would receive the maximum payment.
Despite those differences, the EITC moves billions of dollars annually to low-income working households through the tax code. Yet roughly 22 percent of eligible workers don’t claim it. In tax year 2021, about 5.7 million eligible tax units left the credit on the table.3Internal Revenue Service. EITC Participation Results and IRS-Census Match Methodology
The Design Logic Behind the Rates
The EITC uses fixed statutory percentages that determine how quickly the credit builds and how quickly it fades. These rates are set in the tax code and don’t change from year to year, though the dollar thresholds they apply to are adjusted for inflation annually.2Office of the Law Revision Counsel. 26 USC 32 – Earned Income
- No qualifying children: phases in at 7.65 percent of earnings and phases out at the same 7.65 percent. Maximum credit for 2026 is approximately $664.
- One qualifying child: phases in at 34 percent, phases out at 15.98 percent. Maximum credit for 2026 is approximately $4,427.
- Two qualifying children: phases in at 40 percent, phases out at 21.06 percent. Maximum credit for 2026 is approximately $7,152.
- Three or more qualifying children: phases in at 45 percent, phases out at 21.06 percent. Maximum credit for 2026 is approximately $8,231.
The phase-out rate is always lower than the phase-in rate. The credit builds quickly as you start working and shrinks more slowly as your income rises, keeping you in the benefit zone across a wider income range. For a family with two children in 2026, the credit reaches its maximum at moderate earnings and doesn’t fully phase out until adjusted gross income reaches roughly the low-to-mid $50,000s for single filers, or several thousand dollars higher for married couples filing jointly.
The 2026 federal poverty guideline for a single individual is $15,960.4HealthCare.gov. Federal Poverty Level (FPL) The EITC income limits sit well above that line, extending benefits to families earning two or even three times the poverty level depending on household size. The credit targets not just the very poor, but working families in the gap between poverty and financial stability.
Negative Income Tax vs. Universal Basic Income
The negative income tax is often confused with universal basic income, but the two work differently despite producing similar outcomes on paper. A universal basic income gives every person the same flat payment regardless of earnings, then recoups the cost through higher taxes on people who don’t need it. A negative income tax only sends money to people below the break-even point, so the gross cost to the treasury is lower even when the net effect on household budgets is identical.
The practical difference comes down to who interacts with the government. Under a negative income tax, high earners never receive a payment. They simply pay lower taxes than they would in a system without the program. Under a universal basic income, everyone receives a check and everyone pays higher taxes, with the net result being the same transfer of resources from higher earners to lower earners. Economists have shown that the two can be made mathematically equivalent, but politically and administratively they feel very different. A universal basic income is simpler to explain and removes the stigma of receiving a welfare payment, while a negative income tax costs less on paper and avoids the optics of sending checks to millionaires.
The work-incentive effects also diverge. A negative income tax reduces the benefit as you earn more, which creates some disincentive at the margin. A universal basic income doesn’t reduce the payment itself as income rises, though the higher tax rates needed to fund it can create their own disincentives at different points on the income ladder.
If You Want to Claim the EITC
To claim the credit, you need a Social Security number valid for employment, and you must be a U.S. citizen or resident alien for the entire tax year.5Internal Revenue Service. Who Qualifies for the Earned Income Tax Credit (EITC) You also need earned income, meaning wages, tips, or self-employment earnings. Passive sources like interest, dividends, and rental income don’t count.
There is an investment income ceiling. For the 2025 tax year, the IRS disqualifies anyone whose investment income exceeds $11,950.6Internal Revenue Service. Publication 596, Earned Income Credit The threshold is adjusted for inflation each year. Investment income for this purpose includes taxable interest, dividends, capital gains, and certain other passive returns.
If you claim the credit based on a qualifying child, that child must live with you for more than half the year, be under age 19 (or under 24 if a full-time student), and have a valid Social Security number of their own.7Internal Revenue Service. Child Tax Credit Workers without qualifying children can still claim a smaller credit, but they must be at least 25 and under 65, with narrower income limits.
You claim the EITC on your regular Form 1040. There’s no separate application. You’ll need your W-2 forms from employers and any 1099-NEC forms if you did independent contract work, since both feed into the earned income calculation. Under the PATH Act, the IRS cannot release refunds for any return claiming the EITC or the Additional Child Tax Credit before mid-February, even if you file in January.8Internal Revenue Service. When to Expect Your Refund if You Claimed the Earned Income Tax Credit or Additional Child Tax Credit The hold applies to your entire refund, not just the EITC portion. It exists so the IRS can verify W-2 data and cut down on fraudulent claims.