The IMF’s recent report, Spillovers in international corporate taxation, looks at how national tax decisions can have international impacts, examining how the tax system influences the global economy and developing economies in particular. The report highlights the features of the international tax architecture which raise issues for developing countries, identifies some possible policy responses, and suggests some radical alternatives. Offered as a complement to the BEPS work programme, the report also refocuses on the question of ‘fragile’ concepts of ‘residence’ and ‘source’ which support the current international arrangements.