How the Laffer Curve Frames the Tax Revenue Debate

A Napkin Sketch That Launched a Tax Revolution

In December 1974, economist Arthur Laffer reportedly sketched a curve on a cocktail napkin at the Two Continents restaurant in Washington, D.C. His audience included Dick Cheney and Donald Rumsfeld, then aides to President Gerald Ford. The curve made a simple argument: at a tax rate of 0%, the government collects no revenue; at a tax rate of 100%, the government also collects no revenue because no one would work. Somewhere between those extremes lies a rate that maximizes revenue. If current rates are above that peak, cutting taxes would actually increase government revenue. Laffer later said the napkin story is probably apocryphal—he doesn't remember drawing on a napkin. But the idea took hold. Within six years it became the intellectual foundation of Reaganomics.

The Curve's Logic in Plain Terms

The Laffer curve is a theoretical relationship between tax rates and tax revenue. Its fundamental logic is difficult to dispute at the extremes.

• At 0% tax rate: no revenue (government collects nothing)
• At 100% tax rate: no revenue (no incentive to earn taxable income; all activity moves underground or ceases)
• At some rate between 0% and 100%: revenue reaches a maximum
• The curve is not necessarily symmetric—the revenue-maximizing rate could be anywhere
• The shape of the curve varies by tax type, country, time period, and income group

The political power of the Laffer curve comes from the right half of the arch. If a country's tax rate is above the revenue-maximizing point, then reducing the rate will increase revenue—a conclusion that appears to offer a free lunch: lower taxes AND more government income. The entire supply-side economics movement rests on the claim that the United States (and other developed economies) frequently operate on this right side of the curve.

What Economists Think the Peak Rate Is

The Laffer curve's policy relevance depends entirely on where the revenue-maximizing rate falls. If it is 80%, then most real-world tax rates are below it, and the curve supports the conventional view that lower rates mean less revenue. If it is 30%, then tax cuts could plausibly raise revenue.

The academic consensus clusters around 50–70% for the top marginal rate on high earners. The top U.S. federal marginal rate has been 37% since 2018 (and was 39.6% before that)—well below most estimates of the revenue-maximizing rate. This suggests the U.S. is on the left side of the Laffer curve, where rate cuts reduce revenue.

Reaganomics—The Laffer Curve Goes to Washington

President Ronald Reagan signed the Economic Recovery Tax Act of 1981, cutting the top marginal income tax rate from 70% to 50% (later reduced to 28% by the Tax Reform Act of 1986). Supply-side advisors, including Laffer, argued that the cuts would stimulate enough economic growth to offset the revenue loss.

What happened was more complicated than either side predicted.

• Federal revenue increased in nominal terms but decreased as a share of GDP (from 19.6% in 1981 to 17.3% in 1984)
• The federal deficit tripled, from $79 billion in 1981 to $221 billion in 1986
• Economic growth was strong in 1983–1986, but multiple factors (Fed monetary policy, oil price decline) contributed
• Capital gains tax cuts did increase capital gains realizations (timing effects), partially supporting Laffer's thesis for that specific tax
• The overall evidence: the 1981 rate cuts reduced revenue, not increased it

The Kansas Experiment—A Real-World Test

In 2012, Kansas Governor Sam Brownback implemented what he called "a real-live experiment" in supply-side economics. He signed legislation that eliminated state income tax on pass-through business income entirely and cut the top individual rate from 6.45% to 4.9%. Brownback predicted the cuts would be "like a shot of adrenaline to the heart of the Kansas economy."

The results were unambiguous. Kansas revenue collapsed. The state budget fell into persistent deficit. Kansas job growth lagged neighboring states and the national average. Credit rating agencies downgraded the state. Public schools faced funding cuts severe enough to trigger a state Supreme Court ruling that education funding was unconstitutionally inadequate. In 2017, the Kansas legislature repealed the tax cuts with a bipartisan veto override.

Where the Laffer Curve Actually Works

The Laffer curve is not wrong in concept. It is wrong in its most common political application—the claim that cutting already moderate tax rates will raise revenue. Specific scenarios where the curve's logic has empirical support include:

• Extremely high marginal rates (above 70%): Sweden's tax reforms in the 1990s and the UK's reduction from 83% top rate in 1979 both generated revenue responses consistent with Laffer dynamics
• Capital gains taxes: Timing effects (people realize gains when rates are low, defer when high) create genuine Laffer behavior at moderate rate levels
• Sin taxes at extreme levels: Very high cigarette or alcohol taxes can reduce revenue by driving consumption underground
• Corporate tax competition: Small open economies (Ireland at 12.5% corporate rate) can attract revenue by undercutting neighbors—a Laffer dynamic at the country level

The Shape Nobody Knows

The Laffer curve's enduring influence comes not from its precision—it has none—but from its framing. It reduced the most complex question in fiscal policy to a single image: a hill with a peak. Every tax debate since 1974 implicitly asks the same question Laffer posed on that possibly mythical napkin: which side of the hill are we on? The honest answer, supported by decades of empirical research, is that for most taxes in most developed countries, rates are below the peak. Cutting them further reduces revenue. The curve is real. The free lunch is not.