Switzerland's private banks have until Monday to decide whether to bow to U.S. pressure and ditch the centuries-old culture of secrecy that has made the Alpine state a global vault for the world's rich.
Many are leaving it to the last minute to tell the Swiss financial regulator whether they will participate in a U.S. program to settle tax evasion suspicions that could trigger large fines and force them to identify U.S. customers suspected of using their Swiss accounts to dodge taxes.
Listed banks which participate in the program could start telling investors from next week whether or not they have to take provisions against possible fines.
If they do not settle, individual banks and their senior staff risk criminal prosecution and, if a large number refuse to cooperate, it could hold up a future settlement for around a dozen of Switzerland's largest banks, including Credit Suisse, Julius Baer, Pictet, and local government-backed Zuercher Kantonalbank (ZKB).
Most of the 300 or so smaller banks are expected to participate but they are anxious to find out what others are doing and wrestling with the risk of giving up client confidentiality, which could put off customers.
"Probably a few dozen will risk being pursued by the U.S. later and stay out of the current program altogether," said a lawyer involved in bank talks.