The world of tax is changing. Rulebooks, once certain, will no longer apply. Tax authorities are investing heavily in new technologies that will radically transform their powers of control and oversight, and other stakeholders will also be able to harness growing volumes of digitised data and processing power − all bringing more tax-related transparency. Simultaneously, digital technologies will transform the way corporate tax functions work. In this guide we give readers an outlook on how things are likely to change, what the impact will be, and share with them our views on how to deal with all of this disruption.