International corporate tax avoidance is a growing concern for both advanced economies and low-income countries. The changing nature of the global economy–notably increasing digitalization, in some cases, is making it easier for firms to shift profits to low-tax countries. Michael Keen is a Deputy Director in the IMF's Fiscal Affairs Department, and in this podcast he says the international tax system is under unprecedented stress. Keen was a lead author of a recent IMF policy paper that sets out the current state of the international corporate tax system and explores ways to address some of its shortcomings.