The Laffer curve describes the relationship between tax rates and government tax revenue. Its core claim is simple: a tax rate of 0% raises no revenue, and a tax rate of 100% also raises no revenue (because nobody works, invests, or reports income when the state takes everything). Somewhere between those two extremes lies a rate that maximizes revenue. Raise rates beyond that point and revenue falls, because people respond: they work less, restructure their affairs, shift income into untaxed forms, or leave the country entirely.
The curve is named after economist Arthur Laffer, who famously sketched it on a napkin at a Washington, D.C. dinner in 1974 with Dick Cheney and Donald Rumsfeld, then aides in the Ford administration. Journalist Jude Wanniski, who was at the table, later coined the term "Laffer curve." Laffer himself never claimed the idea was original: he credited the 14th-century Arab historian Ibn Khaldun, who wrote that "at the beginning of the dynasty, taxation yields a large revenue from small assessments; at the end of the dynasty, taxation yields a small revenue from large assessments." John Maynard Keynes made a similar observation in 1933.
The mechanism behind the curve is behavioral response. Tax revenue equals the tax rate multiplied by the tax base, and the base is not fixed. When rates rise, the base shrinks, through several channels.
People supply less labor or take compensation in untaxed forms. Investors defer realizing capital gains, sometimes indefinitely. Business owners retain earnings inside companies rather than paying themselves. Taxpayers spend more on lawyers and accountants to restructure their affairs. Some underreport income outright. And the most mobile taxpayers, the ones this glossary exists for, change jurisdiction altogether.
At low tax rates, these responses are small and rate increases raise revenue roughly proportionally. At high rates, the responses dominate. The question that has occupied economists for five decades is where the turning point actually sits.
The Laffer curve is often invoked as proof that tax cuts pay for themselves. That is not what the mainstream evidence shows, and it's worth being precise here.
Most empirical estimates place the revenue-maximizing rate for broad labor income taxes somewhere between 50% and 75%, well above the top rates in most developed countries. When the Reagan administration cut the top US federal income tax rate from 70% to 28% during the 1980s, income tax revenue did not rise enough to offset the cuts; deficits grew. A 2012 University of Chicago survey of prominent academic economists found that almost none believed a US federal income tax cut would increase revenue within five years. Most economies sit on the left side of the curve for most taxes, and there, cutting rates simply reduces revenue.
But the peak is not one number. It varies enormously by tax type and by taxpayer. Two factors push the revenue-maximizing rate down sharply: how mobile the tax base is, and how easily the taxed activity can be deferred or avoided. Capital gains taxes have a lower peak than wage taxes, because realizations are voluntary and can be postponed. Corporate taxes have a lower peak still, because capital crosses borders easily. And taxes on high-net-worth individuals have arguably the lowest peak of all, because the wealthiest taxpayers are the most internationally mobile people on earth.
For governments taxing ordinary wage earners, the Laffer curve is mostly an academic debate. For governments taxing millionaires, it is an operational constraint, because the behavioral response at the top end is not working fewer hours. It is leaving. The CitizenX Wealth Migration Lab tracks these flows with real-time wealth migration data, and the numbers from recent policy experiments tell a consistent story.
Norway raised its wealth tax in 2022 and lowered the exemption threshold, expecting an additional $146 million per year in revenue. Instead, Wealth Migration Lab research found that individuals worth $54 billion left the country, mostly for Switzerland and the UAE, cutting yearly wealth tax revenue by $594 million. The net result was a loss of over $448 million per year. This is the Laffer curve operating through the emigration channel: the rate went up, the base left, and revenue fell.
France ran the same experiment earlier. Economist Eric Pichet calculated that the wealth tax (ISF) cost France roughly twice as much in lost revenue from capital flight as it collected, with steady departures of wealthy households documented in French finance ministry reports throughout the 2000s. France abolished the broad wealth tax in 2018 and replaced it with a narrower real estate tax, in part to stem the outflow.
The United Kingdom abolished its non-dom regime in April 2025, subjecting long-term wealthy residents to UK tax on worldwide income and, eventually, inheritance tax on worldwide assets. Wealthy residents have since relocated in significant numbers to the UAE, Italy, Switzerland, and Mediterranean CBI jurisdictions, and the Office for Budget Responsibility has flagged the revenue projections as highly uncertain precisely because they depend on how many non-doms leave. Whether the reform raises or loses net revenue for the Treasury remains disputed, but the debate itself is a Laffer curve debate: the government bet the base was less mobile than it turned out to be.
The same dynamic operates inside borders. The Lab's Wealth Exodus dataset, built from IRS migration statistics and state tax records, tracks over $500 billion in wealth that relocated between US states from 2020 to 2024, flowing out of California, New York, and Illinois and into Florida, Texas, and Nevada. No passport required; the Laffer logic is identical.
None of this means every tax on the wealthy backfires. It means the revenue-maximizing rate for internationally mobile taxpayers sits far below the rate for everyone else, and it keeps falling as leaving gets easier.
The Laffer curve is not a law of nature with a fixed shape. Its steepness depends on how easy exit is. In 1970, a wealthy Norwegian or Frenchman who disliked his tax bill faced real barriers to leaving: visas, closed banking systems, capital controls, and the practical difficulty of running a business from abroad. Exit was costly, so the behavioral response to high rates was muted and governments could push rates higher without losing the base.
That world is gone. Citizenship by investment programs, golden visas, remote work, borderless banking, and portable assets like Bitcoin have collapsed the cost of exit for high-net-worth individuals. A second passport from a Caribbean CBI program costs $200,000 to $400,000, less than a single year's wealth tax bill for many of the people buying them. Once acquired, it converts the theoretical option to leave into a practical one that can be exercised in months.
This gives investment migration a policy dimension beyond any one person's tax bill. Every additional person holding a second citizenship makes the tax base more elastic, which shifts the revenue-maximizing rate down and disciplines governments that might otherwise push rates past the peak. Jurisdictions compete for mobile residents the way companies compete for customers, and the Laffer curve is the mechanism that transmits that competition into tax policy. Countries like the UAE, Malta, Monaco, and several Caribbean states have positioned themselves on the receiving end of exactly the flows that Norway, France, and the UK triggered.
If you are a high-net-worth individual in a high-tax jurisdiction, the Laffer curve has a practical implication: governments facing revenue pressure tend to raise rates on the wealthy first, because it is politically popular, and they do it even when the revenue case is weak. Norway, Spain's solidarity tax, and the UK non-dom reform all followed this pattern. Betting that your home country will stay on the sensible side of the curve is a bet on political restraint that recent history does not support.
A second citizenship or alternative tax residency is insurance against that bet going wrong. It does not obligate you to leave; acquiring a passport from a CBI program does not by itself change your tax residency or your obligations at home. What it does is fix the cost of exit in advance, so that if your jurisdiction moves past the peak of its own curve, you are positioned to respond on your timeline rather than scrambling alongside everyone else. As with all tax residency decisions, sequencing matters and mistakes are expensive. Work with qualified tax and immigration advisors in both your current and destination jurisdictions before acting.