Swiss bank UBS says customers may withdraw 15 billion to 40 billion Swiss francs ($15 billion to $41 billion) because of revised tax treaties between Switzerland and other European countries.
UBS says customers from Germany, France, Italy, Austria and Britain made net withdrawals worth 20 billion francs over the past years.
The bank said Tuesday that "15-40 billion francs are still at risk as a result of changes in the tax regulations."
Deposits at UBS and rival Credit Suisse Group have long been a target of foreign governments eager to track down untaxed assets belonging to their citizens.
Bern has recently signed treaties with France, Britain, the United States and others aimed at helping those countries obtain information on suspected tax cheats.
© Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.