US, Switzerland sign treaty increasing information exchange to counter tax evasion

Since March, Switzerland has signed 11 tax information exchange agreements, one short of the number required by OECD [ a Common Market Org] for it to be removed from a 'gray list' of uncooperative tax havens

U.S. tax authorities will be able to request information on Americans suspected of concealing Swiss bank accounts, the Swiss Finance Ministry said.
The treaty forbids so-called 'fishing expeditions,' meaning U.S. authorities have to provide specific details on the person they are seeking further information about and can't simply ask for wholesale lists of Americans with Swiss accounts, the ministry said.

US, Switzerland sign treaty increasing information exchange to counter tax evasion -- chicagotribune.com