Raoul Weil, 54, entered the plea in a Florida courtroom to charges first filed in 2008. He was a fugitive until his arrest in October in Bologna, Italy, and he was later extradited to the US He is free on USD 10.5 million bail, but he can reside or travel only in South Florida, New Jersey and southern New York.
Prosecutors say Weil, who left UBS in 2009, conspired as its chief of Global Wealth Management to hide USD 20 billion in assets from the Internal Revenue Service using secret overseas accounts for thousands of wealthy customers. Weil's New York-based attorney, Aaron Marcu, said Weil will fight the charges.
Other UBS bankers have also been prosecuted, and in 2009 the bank itself paid a USD 780 million fine and agreed to turn over thousands of names of customers suspected of evading US taxes. Many have been prosecuted since, and still others paid penalties and back taxes under an IRS amnesty program.
Weil has worked for another Swiss bank, Reuss Private Group, since 2010 and was its chief executive officer when he was arrested. One of Weil's former UBS deputies, Bradley Birkenfeld, reached a plea deal and provided US authorities with a vast amount of key information used to prosecute others.
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"Weil has information that would be extremely embarrassing to wealthy and powerful people in the United States and other countries," said Stephen Kohn, one of Birkenfeld's lawyers.
"We will be carefully monitoring this case to make sure the American people are fully protected," Kohn said.