Taxing profit in a global economy : a report of the Oxford international tax group

## Abstract This book undertakes a fundamental review of the existing international regime for taxing business profit. It steps back from the current political debates on how to combat profit shifting and how taxing rights over the profits of the digitalized economy should be allocated. Instead, it starts from first principles to ask how we should evaluate a tax on business profit—and whether there is any good rationale for such a tax in the first place. It then goes on to evaluate the existing regime and a number of alternatives that have been proposed. It argues that the existing regime is fundamentally flawed, and that there is a need for radical reform. The key conclusion from the analysis is that there would be significant gains from a reform that moved the regime towards taxing profit in the country in which a business made its sales to third parties. That conclusion informs two proposals that are put forward in detail and evaluated: the Residual Profit Allocation by Income (RPAI) and the Destination-based Cash Flow Tax (DBCFT). The book is authored by group of economists and lawyers—the Oxford International Tax Group, chaired by Michael Devereux. It draws insights from both economics and law—including economic theory, empirical evidence on the impact of taxes, and a detailed examination of practical issues of implementation—to assess the existing system and to consider fundamental reforms. This book will be useful to tax policy makers, tax professionals, academics, and anyone interested in tax policy. This is an open access title available under the terms of a CC BY-NC-ND 4.0 licence. It is offered as a free PDF download from OUP and selected open access locations. This book undertakes a fundamental review of the existing international system of taxing business profit. It steps back from the current political debates on how to combat profit shifting and how taxing rights over the profits of the digitalized economy should be allocated. Instead, it starts from first principles to ask how we should evaluate a tax on business profit—and whether there is any good rationale for such a tax in the first place. It then goes on to evaluate the existing system and a number of alternatives that have been proposed. It argues that the existing system is fundamentally flawed, and that there is a need for radical reform. The key conclusion from the analysis is that there would be significant gains from a reform that moved the system towards taxing profit in the country in which a business made its sales to third parties. That conclusion informs two proposals that are put forward in detail and evaluated: the Residual Profit Allocation by Income (RPAI) and the Destination-based Cash Flow Tax (DBCFT). The book is authored by group of economists and lawyers—the Oxford International Tax Group, chaired by Michael P. Devereux. It draws insights from both economics and law—including economic theory, empirical evidence on the impact of taxes, and an examination of practical issues of implementation—to assess the existing system and to consider fundamental reforms. This book will be useful to tax policy makers, tax professionals, academics, and anyone interested in tax policy. The international tax system is in dire need of reform. It allows multinational companies to shift profits to low tax jurisdictions and thus reduce their global effective tax rates. A major international project, launched in 2013, aimed to fix the system, but failed to seriously analyse the fundamental aims and rationales for the taxation of multinationals' profit, and in particular where profit should be taxed. As this project nears its completion, it is becomingincreasingly clear that the fundamental structural weaknesses in the system will remain. This book, produced by a group of economists and lawyers, adopts a different approach and starts from first principles in order to generate an international tax system fit for the 21st century. This approach examines fundamental issues of principle and practice in the taxation of business profit and the allocation of taxing rights over such profit amongst countries, paying attention to the interests and circumstances of advanced and developing countries. Once this conceptual framework is developed, the book evaluates the existing system and potential reform options against it. A number of reform options are considered, ranging from those requiring marginal change to radically different systems. Some options have been discussed widely. Others, particularly Residual Profit Split systems and a Destination Based Cash-Flow Tax, are more innovative and have been developed at some length and in depth for the first time in this book. Their common feature is that they assign taxing rights partly/fully to the location of relatively immobile factors: shareholders or consumers The international tax system is in dire need of reform. It allows multinational companies to shift profits to low tax jurisdictions and thus reduce their global effective tax rates. A major international project, launched in 2013, aimed to fix the system, but failed to seriously analyse the fundamental aims and rationales for the taxation of multinationals' profit, and in particular where profit should be taxed. As this project nears its completion, it is becoming increasingly clear that the fundamental structural weaknesses in the system will remain. This book, produced by a group of economists and lawyers, adopts a different approach and starts from first principles in order to generate an international tax system fit for the 21st century