The conference was attended by approximately 250 senior officials from the following countries and organisations:

Argentina, Australia, Barbados, Belgium, Belize, Bolivia, Bosnia and Herzegovina, Brazil, Cameroon, Canada, Chile, China, Congo, Costa Rica, Cote d'Ivoire, Denmark, Dominican Republic, Ecuador, Egypt, El Salvador, Fiji, France, Georgia, Germany, Guatemala, Honduras, Hungary, Indonesia, Iran, Israel, Italy, Japan, Kenya, Kuwait, Latvia, Lebanon, Lesotho, Madagascar, Malaysia, Malta, Mauritius, Mexico, Montenegro, Morocco, Netherlands, New Zealand, Norway, Pakistan, Paraguay, Peru, Russian Federation, Rwanda, Samoa, Sierra Leone, Singapore, Slovak Republic, Slovenia, South Africa, Spain, Sudan, Swaziland, Sweden, Tanzania, Thailand, Togo, Turkey, Uganda, Ukraine, United Kingdom, United States, Uruguay, Vietnam, Zambia

Department for International Development (DFID), Economic Commission for Latin America and the Caribbean (CEPAL), European Community (EC), Inter-American Center of Tax Administrations (CIAT), Inter-American Development Bank (IDB), International Monetary Fund (IMF), Intra-European Organisation of Tax Administrations (IOTA), Organisation for Economic Cooperation and Development (OECD), World Bank