The Department of Justice filed a suit seeking to force UBS to disclose the holders of accounts with about $14.8bn in assets. It alleged UBS, Switzerland's biggest bank, engaged in cross-border securities transactions in the US that it knew violated security laws and helped US taxpayers set up dummy offshore companies.
UBS said it would challenge enforcement of the complaint.
The complaint came a day after UBS agreed pay $780m in fines and turn over about 250 names to the US as part of a settlement of two other US government lawsuits in which it admitted having enabled clients to evade taxes.
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