New York State’s banking regulator has reportedly subpoenaed Swiss banking giant Credit Suisse last week as the regulator’s tax evasion probe of the firm widens.

The New York Department of Financial Services (DFS) has sought records from the firm’s New York operations, including e-mails, travel records, calendars, payroll information and material on hard drives.

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Specifically, the regulator has subpoenaed employment records of Roger Schaerer, former head of Credit Suisse’s New York branch.

The subpoena also seeks human resource and compensation plans for the bankers.

Credit Suisse and the?New York DFS declined to comment on the investigations.

New York regulators began investigating Credit Suisse last month after a US Senate subcommittee reported that the bank helped US taxpayers holding 22,000 accounts evade paying taxes to the US government.