The Switzerland Ministry of Finance has announced that the new protocol amending the 1974 income and capital tax treaty between Switzerland and Austria, signed on 21 March 2006, entered into force on 2 February 2007. The protocol generally applies retroactively from 1 January 2006. Treaty between United States and Bulgaria to be signed The Office of Public Affairs of the US Treasury Department has announced that a first-time income tax treaty and protocol between United States and Bulgaria will be signed on 23 February 2007. Further details of the treaty will be reported subsequently