Since end of November 2004, the Valordata Feed (VDF) from SIX Telekurs has been supplying an expanded range of data for the taxation of savings income according to the EU Directive issued in June 2003. SIX Telekurs provides the data needed by the banks to implement the new tax regulations.
Find more information in the following documents:
Fact sheet: VDF - EU Directive on the taxation of savings income 
Council of the European Union Directive 2003/48/EC 
Federal Tax Administration (German language document) 