Gian Gisler was accused of aiding 38 such people to use Swiss banks in order to stow away more than $215 million.
According to the US Justice Department, it has been alleged the industry figure opened and managed more than 60 hidden accounts.
Mr Gisler acted as a client adviser at UBS - which has a heritage stretching back more than 150 years and was charged in 2009 with helping Americans evade tax - from the middle of the 1990s until late 2008 before being employed at a Swiss asset management firm.
A statement from US attorney Preet Bharara read: "From the mid-1990s through at least 2010, Gisler allegedly conspired with various US taxpayers and others to ensure that his clients could hide their Swiss bank accounts."
By Gary Cooper