Few economic policies generate as much heat as wealth taxes.
Supporters see them as a way to tax fortunes that ordinary income taxes miss. Critics warn that the wealthy will simply leave, taking their companies, investment and tax payments with them.
Most of that debate runs on theory and anecdote.
Norway offers something better: a real policy change, and detailed data on what happened next.
Between 2021 and 2024, Norway raised taxes on business owners in several steps. A new study using Norwegian administrative data finds that at most about 100 people left because of the reforms, and that firms owned by Norwegians did not invest less.
Norway tightened taxes on wealthy business owners
Norway is one of the few countries that still taxes personal wealth, including the value of shares in privately owned companies.
The reforms studied by economist Marius A. K. Ring did three main things:
- raised the tax rate on dividends
- closed loopholes that had let people who moved abroad avoid capital gains tax
- nearly doubled the effective marginal tax rate on business wealth
The changes prompted widespread media coverage of wealthy Norwegians moving abroad, especially to Switzerland.
At most about 100 people left because of the reforms
There was a real response, but it was narrow.
The study finds clear migration effects, but they were concentrated among the top 0.1% of the wealth distribution, and mostly occurred in 2022 and 2023.
The paper estimates that at most 100 people left because of the reforms.
It finds no evidence of broad outmigration, and no drop in the number of startup founders or inventors moving to Norway.
Their companies showed little sign of investing less
This is the core of the study, and the most surprising result.
The fear behind wealth tax criticism is not just that owners leave, but that their businesses suffer. Owners might pull money out of their firms to pay the tax, cut investment, or move operations abroad.
The study finds little sign of that.
Firms whose owners moved abroad remained economically active and did not cut investment.
More broadly, the author compared Norwegian-owned firms with similar firms owned by foreigners or tax-exempt entities, who were not affected by the reforms. After the reforms, Norwegian-owned firms:
- did not invest less
- did not pay out more dividends
- did not go bankrupt more often
Owners could move, but their companies mostly stayed
There is a simple reason this might be the case.
A wealthy person can move to another country. Their company often can’t.
A Norwegian manufacturer, software firm or shipping company has its employees, customers, offices and contracts in Norway. When the owner moves to Switzerland, the business usually stays where it is, and keeps operating much as before.
That creates a useful distinction for policymakers. The tax base that moves is the owner’s personal residence. The economic activity is much stickier.
The departures cut the revenue gain only slightly
The departures were few, but they were among the richest people in the country, so they were not trivial for public finances.
The study estimates that without any outmigration, wealth tax revenue would have risen by about 75% from 2021 to 2024. With the reform-driven departures, the increase was about 71.5%.
So the exodus cost something, but most of the intended revenue gain remained.
The limits of the evidence
This is an NBER working paper and has not yet been peer reviewed.
It also measures short-run effects. Some consequences of higher taxes on entrepreneurs, such as fewer new companies being started over a decade, or founders choosing other countries before they become rich, may take longer to show up.
And Norway is a specific case: a small, high-trust economy with strong administrative data, a long history of wealth taxation, and its own rules on exit taxes. The results may not transfer directly to larger economies such as the United States, or to countries with different tax systems.
Finally, “at most 100 people” is not “nobody.” The study confirms that the very wealthiest do respond to taxes. The question it answers is how large and how damaging that response was.
A measurement replaced a hypothetical
The study doesn’t settle whether wealth taxes are good policy. That is a question of values as well as economics.
What it does is replace a hypothetical with a measurement.
In Norway, at least, the predicted exodus turned out to be small, and the predicted damage to business investment did not appear in the data.
The owners were mobile. Their companies largely were not.