A quiet but growing trend emerged in the early 2010s: more Americans than at any previous point were formally renouncing their United States citizenship, and taxes were a central reason why.

The numbers, while still small in absolute terms, were striking in their trajectory. The Treasury Department reported a sharp increase in expatriations beginning around 2010, with the figure climbing steadily each subsequent year. Among those making the decision were a disproportionate number of long-term American expatriates — people who had built lives abroad, often for decades, and who were finding the administrative and financial burden of maintaining US citizenship increasingly untenable.

The United States is one of only two countries in the world — Eritrea is the other — that taxes its citizens on worldwide income regardless of where they live. An American living in Switzerland, Australia, or Singapore is required to file US tax returns every year and, depending on their income and assets, may owe US taxes in addition to whatever taxes they pay locally. The Foreign Account Tax Compliance Act (FATCA), signed into law in 2010 and implemented in subsequent years, intensified this burden dramatically by requiring foreign financial institutions to report information on accounts held by US persons — leading many foreign banks to simply stop serving American clients.

For some expatriates, the math became unavoidable. The cost of annual tax compliance — accountants familiar with international reporting requirements don't come cheap — combined with the complications of holding foreign financial accounts, pushed renunciation from an abstract option to a practical consideration.

Critics of the trend argued that wealthy Americans were exploiting a loophole — that renunciation was being used to shed tax obligations on large accumulated fortunes. The exit tax, which treats certain assets as sold at the time of expatriation, was designed to address this, though its effectiveness has been debated.

What the trend illuminated, beyond the specific grievances, was a fundamental tension in the concept of citizenship itself: what obligations does a country retain over people who have built their lives entirely elsewhere?