On January 26, at the Faculty of Law of the University of Barcelona, an international conference will take place to analyze the role of world institutions such as the Organization for Economic Co-operation and Development (OECD), European Union or the United Nations regarding the cooperation between State fiscal authorities. Also, on Friday 27, there will be a roundtable to debate on the challenges presented at the international fiscal cooperation in the situation regarding Brexit in the United Kingdom or Donald Trump’s presidency in the United States.