Stephen Kohn had 104 million reasons to be happy on Tuesday. But America’s taxpayers should be happy, too, he said.

Kohn, 56, is one of the Washington attorneys for whistleblower Bradley Birkenfeld, the former bank executive who helped American authorities expose tax evasion facilitated by UBS AG, the Swiss banking giant.

On Tuesday, Birkenfeld got his reward from the Internal Revenue Service: $104 million, the most ever granted to an individual in a whistleblower case. Kohn and his firm worked on a contingency basis, entitling them to a cut of Birkenfeld’s award. Kohn won’t discuss the fee, but he described it as “not a standard contingency fee.”

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