intends to demonstrate that the profit shifting phenomenon (i.e., the ability of companies to book their profits in jurisdictions other than those that host their economic activities) is real, severe, undesirable, and above all, the natural consequence of both the preservation of three fundamental paradigms that have historically underlain corporate income taxes and their precise legal configuration. In view of this, the book submits a number of proposals in relation to the aforementioned paradigms and in the light of the suggested “presumptive benefit principle” so as to counteract profit shifting risks and thus attain a more equitable allocation of taxing rights among States. This PhD thesis obtained the prestigious European Academic Tax Thesis Award 2018 granted by the European Commission and the European Association of Tax Law Professors. This book provides a disruptive discourse on tax sovereignty in the field of corporate income taxation that endeavors to escape from long-standing tax policy tendencies and prejudices while considering the challenges posed by a globalized (and increasingly digitalized) economy. In particular, the book offers an innovative perspective on certain deep-rooted paradigms historically underlying corporate income taxation: The book explores their respective origins, supposed tax policy rationales, structural problems and interactions; ultimately showing how the way tax jurisdiction is currently defined through them inherently tends to trigger profit shifting outcomes. In view of the conclusions of the study, the author suggests the use of a new version of the traditional benefit principle (the “presumptive benefit principle”) that would contribute to address the profit shifting phenomenon while serving as a practical guideline to achieve a more equitable allocation of taxing rights among jurisdictions. Finally, the book submits a number of proposals inspired by the aforementioned guideline that aspire to strike a balance between equity, effectiveness and technical feasibility. They include a new corporate tax residence test and, most notably, a proposal on a new remote-sales permanent establishment. With its case study (based on the Apple group) empirically demonstrating the existence of the profit shifting phenomenon, its clearly documented exposure of the reasons why traditional corporate income tax regimes systematically give rise to these outcomes, its new tax policy guideline and its proposals for reform, this book makes a significant contribution to current tax policy discussions concerning corporate income taxation in cross-border scenarios. It will be warmly welcomed by all concerned—policymakers, scholars, practitioners—with the greatest tax policy challenges that corporate income taxation is facing in the contemporary world.