The Department of Justice said that on or around October 14th 2008, yacht broker Robert Moran filed a return for the 2007 tax year that neglected to mention that he held any interest in, or had signature authority over, a UBS account.
Mr Moran also failed to disclose any income from that account.
However, according to court records, he was the beneficial owner of a UBS account in the name of Winter Drive Investments. Between 2001 and 2008, he held email, telephone and face-to-face discussions with UBS bankers about the purchase and sale of securities, as well as the conversion of investments from US dollars into euros.
Mr Moran faces a maximum prison term of three years and a fine of up to $250,000. He is scheduled to be sentenced on June 26th.
In February, UBS - Switzerland's largest bank - admitted helping a number of clients to hide their assets from US authorities and agreed to pay $780 million in penalties and restitution.