Even some who acknowledge tax worries say decisions to renounce are far more complicated than a simple desire to avoid paying.
Peter Dunn, born in Chicago and raised in Alaska, moved to Canada to pursue a graduate degree in theology. He met his wife, Catherine, and they made Toronto home when her work as one of the owners of an aviation maintenance firm made her the breadwinner.
Dunn remained an American. But he was alarmed by a change in U.S. law requiring those with more than $2 million in assets to pay an exit tax if they gave up citizenship. He didn't have $2 million. But his wife was doing well enough that he imagined one day they could get there. The idea of the U.S. government taxing his Canadian wife's money didn't seem right.
"When I learned about that, I decided that to protect my wife, I better expatriate," he says.
Corine Mauch arrived at the same decision by a different route. Mauch was born a U.S. citizen to Swiss parents who were college students in Iowa. They lived in the U.S. until she was 5, then again for two more years before she turned 11. Mauch maintained dual citizenship even after she was elected to Zurich's city council. But when she became mayor, she reconsidered.
During the last American presidential election, "I asked myself 'Where do I feel at home?' And the answer is clear: In Zurich and in Switzerland. My attachment to America is limited to my very early youth," Mauch said. Double taxation was "not the crucial factor for my decision. But I will not miss the U.S. tax bureaucracy either."
Taxes play little or no role in other decisions.
Norman Heinrichs-Gale's parents were missionaries from Washington state who raised him in Asia and the Middle East. In 1986, he traveled to Austria with his American wife, and they found work at a conference center in an alpine valley town of 6,000. The jobs were supposed to last a year. But the couple stayed, sending their children to local schools.
On yearly trips to the U.S. he felt increasingly like a stranger. "I never forget going into a grocery store and just being stunned by my choice of cereals," Heinrichs-Gale says. "I was stunned by just the pace of life compared to what we have here, stunned by the extremes of wealth and poverty that I encountered."
There wasn't one single thing that pushed him away. But his children wanted to attend Austrian colleges and he and his wife wanted to vote in the country they considered home. The family was tired of renewing visas and work permits. And so they signed documents giving up U.S. citizenship. Now, one of the last vestiges of American culture in their home is watching Seattle Seahawks games online.
Sports played the central role in Quincy Davis III's decision. Davis, raised in Los Angeles and Mobile, Ala., played professional basketball in Europe after three years as Tulane University's leading scorer. By 2011, he was home studying to become a firefighter when he was offered a spot on a Taiwanese pro squad. He's since helped lead the Pure Youth Construction team to two championships.
When the team's owner suggested last year that he join Taiwan's national team, Davis says he found little motivation to keep his U.S. citizenship.
"When you think about who I am as a black guy in the U.S., I didn't have opportunities," he says. "You get discriminated against over there in the South. Here everyone is so nice. They invite you into their homes, they're so hospitable. ... There's no crime, no guns. I can't help but love this place."
Many others cutting their U.S. ties say tax laws drive decisions that have nothing to do with secreting wealth.
"I wish I were wealthy," said Nelson, who says she takes in about $50,000 a year from pensions and earnings from publishing an online journal covering credit union news.
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