This contribution examines the legal legitimacy of ‘Article IV Consultations’ performed by the IMF as part of its responsibility for surveillance under Article IV of its Articles of Agreement. The analysis focuses on tax recommendations given by the Fund to its member countries in the context of Consultations. This paper determines that these tax recommendations derive from a broad interpretation of the powers and obligations that have been agreed to in the Fund’s Articles of Agreement. Such an interpretation leads to a legitimacy deficit, as member countries of the Fund have not given their state consent to receive recommendations as to which should be the tax policies it should adopt.