Last week, a notable absence of top-ranked men’s tennis players at the Queen’s Club tournament in London highlighted concerns over Britain’s taxation policies for athletes. Only one player from the world’s top 10 competed at the traditional Wimbledon warm-up event, while several stars, including Alexander Zverev, Daniil Medvedev, Taylor Fritz, and Ben Shelton, opted to play at a tournament nearly 300 miles away in Halle, Germany.

One key factor influencing this shift is the United Kingdom’s tax system, which extends beyond taxing prize money earned on British soil to include a portion of players’ global endorsement income. This income is prorated based on the number of days a player spends in the U.K., creating situations where early exits from the tournament can lead to tax bills on sponsorship earnings that exceed the prize money won. As a result, athletes with the flexibility to choose their competing venues are increasingly avoiding events subject to these tax provisions.

Retired tennis star Rafael Nadal has publicly acknowledged the impact of these tax rules, noting how the deductions on sponsorship income have sometimes caused financial losses despite playing at U.K. tournaments.

The phenomenon of affluent individuals relocating or adjusting their economic activities in response to tax policies is not confined to professional sports. Similar effects have been documented internationally. For example, when Norway increased its top wealth tax by one percentage point in 2022, economist Christine Blandhol observed a wave of business owners moving to Switzerland—a shift facilitated by an agreement preventing double taxation during relocation. This migration led to diminished tax revenue and reduced productivity among the businesses left behind.

Switzerland’s internal structure also illustrates the impact of wealth tax differentials. Its 26 cantons impose varying wealth tax rates, ranging from approximately 0.1% to 0.9%, prompting wealthy individuals to move from higher-tax areas like Bern to lower-tax regions such as Lucerne.

Acknowledging the challenges posed by taxpayer mobility, economists such as Gabriel Zucman of UC Berkeley have advocated for internationally coordinated minimum taxes on billionaire wealth. The goal of such global measures is to eliminate tax havens and prevent the wealthy from avoiding taxes by relocating. However, critics suggest that even a coordinated global wealth tax may not address other responses from taxpayers that reduce both tax revenue and economic activity.

In Denmark, for example, long-term tax records from its wealth-tax period indicate that increased taxation led to diminished wealth accumulation among residents who remained in the country. The incentive to save and build wealth declined, independent of any physical relocation.

Moreover, business owners often respond to wealth tax obligations by extracting larger dividends to cover their liabilities. These dividends, once removed from the company, are less likely to be reinvested in expansion or employee wages, potentially dampening overall business growth.

This dynamic can also indirectly affect workers. Reduced reinvestment slows the growth of capital stock—such as tools and equipment—that boosts labor productivity and wages. Over time, this results in lower wage growth for workers who are not subject to the wealth tax themselves.

Similar patterns have been observed with other tax hikes. After California increased its top income tax rate by three percentage points in 2012, economist Joshua Rauh found that many high earners adjusted their financial reporting and timing of income to minimize tax liabilities. Within two years, much of the anticipated revenue gain had dissipated.

These experiences suggest that raising taxes can prompt behavioral changes including reduced economic activity, income restructuring, or relocation when possible. As such, advocates for aggressive taxation policies face challenges in achieving projected revenue targets without unintended economic consequences. The broader implication is that the economy as a whole—and not solely high-income individuals—may experience negative effects from such policies.