U.S. Taxpayers with undisclosed Swiss accounts that have been sent letters by Swiss Banks should know that the Swiss Banks will potentially provide information about U.S. Taxpayers with undisclosed Swiss bank accounts to the IRS. This disclosure of U.S. taxpayer account information is happening because some of the banks in Switzerland are joining the IRS Voluntary Disclosure Program for banks.  The Swiss banks that are entering into the IRS Voluntary Disclosure Program are trying to avoid criminal prosecution and/or investigation.