While the top income-tax rate in the United States is 35 percent, the numbers are a bit misleading. “People coming from the U.S. to the Netherlands focus on that difference, and on that 52 percent,” said Constanze Woelfle, an American accountant based in the Netherlands whose clients are mostly American expats. “But consider that the Dutch rate includes social security, which in the U.S. is an additional 6.2 percent. Then in the U.S. you have state and local taxes, and much higher real estate taxes. If you were to add all those up, you would get close to the 52 percent.”
via nytimes.com