Up Next at Supreme Court: How Much Tax Pain Should Expats Face?

But the original reason for the entire hairball of complexity is the peculiar American way of taxation, which is in effect unique in the world (only Eritrea has something vaguely similar). That approach is called citizenship-based taxation (CBT). It means that a person’s passport or Green Card, not the place of residence, determines tax status and liability.

The unintended consequences are legion. One is to snare “accidental Americans” in the nets of the IRS and FinCEN. These are people who — usually because their parents happened to be in the US when they were born — have U.S. citizenship but otherwise no connection to America. One day, they may receive a letter informing them of bureaucratic torment on a scale that would impress Franz Kafka.

This (largely coincidental) intertwining of citizenship law and tax law over the decades has made the US unique. All countries want to crack down on tax cheats who hide money in offshore accounts — that’s why ever more governments are agreeing to share financial information with one another. But only the U.S. hits millions of expats who have modest assets and little clue every time it targets rich and sophisticated tax dodgers living stateside.

In a sign of growing desperation, a guerrilla insurgency of litigation is now forming from Canada to Israel to Europe. In the UK, a woman named Jenny Webster, American-born but British, has been taking the British authorities to court for sharing her financial information with the U.S., arguing that this amounts to violations of her data privacy.

In France, Fabien Lehagre, born in the U.S. but French by upbringing, founded the Association of Accidental Americans. He’s got legal cases under way in several countries. With his input, France’s National Assembly recently passed a measure that would make its government stop sending people’s financial data to the US in accord with FATCA, unless the U.S. reciprocates by sending information about French taxpayers in return. But the bill was nixed in the French Senate.

In the Netherlands, a court recently prohibited a local bank from closing the accounts of Accidental Americans in the country. And the European Parliament sent a delegation to Washington, DC, to discuss the problems caused by FATCA.

But all these efforts only treat the symptoms of the underlying aberration, which is citizenship-based taxation. So another group of lawyers — including Marc Zell, an Israeli-American, and John Richardson, a Canadian-American — wants to challenge the constitutionality of CBT as such, at least in its current form. They’re now building their case.

There are lots of reasons why people born in the U.S. at some point find themselves living abroad. It shouldn’t be U.S. government policy, even implicitly, to make such lives unnecessarily difficult. America must treat all its citizens equally, whether they live at home or overseas.

The nine robed justices now have an opportunity to send the first small sign that they got that message. Alexandru Bittner shouldn’t be financially ruined just because he made unintentional errors while he lived abroad. Nor should any other American — or indeed anybody at all.

(Image: Adobe Stock)

Andreas Kluth is a Bloomberg Opinion columnist covering European politics. A former editor in chief of Handelsblatt Global and a writer for the Economist, he is author of “Hannibal and Me.”