The Noose Tightens: Swiss Banks Deliver Up Data (9/11/11)

Ten of the more significant Swiss bank players in assisting U.S. taxpayers hide their income from U.S. tax authorities have delivered statistical data to the U.S. The data is sufficiently broad that it does not identify individual taxpayers but almost certainly could give the U.S. ways to sharpen its focus on the information and documents that it might ultimately demand from the banks.

An article in Tax Notes (Randall Jackson, Swiss Banks Turn Over Statistical Data in Tax Evasion Investigation, 2011 TNT 177-3 (9/13/11)) reports:
The banks include the following:

HSBC
Wegelin
Julius Baer
Basler Kantonalbank
Zürcher Kantonalbank

Eveline Widmer-Schlumpf, chief of the Swiss Federal Department of Finance, on September 10 also stated that statistical data had been turned over to U.S. officials. However, she added that no personal data had been disclosed. "That would be a violation of banking secrecy," she said, as quoted in a September 11 Agence France-Presse report.
Widmer-Schlumpf stressed that reaching a mutually acceptable outcome between the United States and Switzerland over the latest tax argument is of vital importance, but that it would not require an emergency law or separate treaty.
"The fact is that we are working with a lot of commitment for a solution that Switzerland can deliver within the existing legal framework of administrative assistance in the case of tax fraud and tax evasion. This is happening in accordance with the government and in conjunction with the involved banks. There is no need for an emergency law or separate treaty," she said, as quoted in a September 11 interview with NZZ am Sonntag.

Katie Reid, U.S. Obtains Data From 10 Swiss Banks In Tax-Dodging Probe (Huffington Post/Reuters 9/10/11), here.

Breaking News 9/13/11:

As the commenter notes below, the reports are that the Swiss are caving for all banks by now allowing what I call John Doe Treaty requests as follows (US client data to be provided based on activity (swissinfo.ch), here):

In cases where US authorities are able to supply enough details to justify a suspicious pattern of behaviour, Swiss banks will hand over the names and account details of US clients suspected of tax fraud – which happened to 4,500 UBS clients in 2009.

Of course, the U.S. will only be able to supply very general characteristics, such as use of foreign entities between the swiss account and the U.S. taxpayer, failure to supply the required forms, perhaps some minimum dollar amount (say $50,000).  Many of the characteristics might be discernible from the aggregate data discussed above, and were a key component of the UBS requests.

I will post more on this as more details are known.