This article is a summary of the findings of the book "Proportionality and Fair Taxation" published in 2014, in which the author investigated the role of the proportionality principle coupled with the standard of reasonableness in assessing specific tax issues and the overall fairness of particular taxes and tax systems. Among those issues, the author points out equality and non-discrimination, retrospective taxation, tax penalties and sanctions, specific and general anti-avoidance rules, as well as the application of proportionality in tandem with reasonableness in double taxation conventions, human rights and tax related rules of international trade.

This in-depth coverage recognizes that tax law does not exist in isolation and reveals how tax law frequently overlaps with competition law, administrative law, environmental law, and constitutional law, and how principles from these areas of practice can affect the adjudication of tax cases. Proportionality and Fair Taxation is an important guide for all involved in tax law. Tax lawyers will find valuable insights that will help with both litigation and counselling whilst practitioners, academics, and policymakers will appreciate how the book reveals the extent to which an informed awareness of proportionality coupled with reasonableness is essential for the fair, consistent, and effective application of tax rules or measures. Order Proportionality and Fair Taxation by Joao Dacio Rolim for an in-depth discussion and practical guidance on the fundamental role of proportionality in tax matters

This landmark volume of specially commissioned, original contributions by top international scholars organizes the issues and controversies of the rich and rapidly maturing field of comparative constitutional law. Divided into sections on constitutional design and redesign, identity, structure, individual rights and state duties, courts and constitutional interpretation, this comprehensive volume covers over 100 countries as well as a range of approaches to the boundaries of constitutional law. While some chapters reference the text of legal instruments expressly labeled constitutional, others focus on the idea of entrenchment or take a more functional approach. Challenging the current boundaries of the field, the contributors offer diverse perspectives - cultural, historical and institutional - as well as suggestions for future research. A unique and enlightening volume, Comparative Constitutional Law is an essential resource for students and scholars of the subject.

This ground-breaking book brings clarity to the dynamically developing field of international tax law. It empowers individuals and corporate taxpayers to navigate their way around and helps tax authorities take taxpayers' rights into account from the beginning. The book is the result of several years of research conducted with the support of the International Law Association. Taxpayers in International Law puts taxpayers' rights on the global international tax agenda as the necessary counterweight and complement to Base Erosion and Profit Shifting (BEPS). Importantly, it pleads for a global minimum standard of legal protection of the fundamental rights of taxpayers and extracts the content of such rights from relevant constitutional principles of many countries around the world. The book is structured in 3 parts: Part I focusses on the legal sources and on the relations between taxation and international human rights law. Part II identifies general principles and specific taxpayers' rights, groups them into 3 categories (procedural, related to sanctions, and substantive), and analyses the different implications that arise in each of them. Part III features concrete proposals for establishing a global framework for the protection of taxpayers' rights, including guidelines for tax authorities. The book is a unique instrument for the daily work of practitioners and international tax scholars interested in securing the protection of taxpayer's fundamental rights, as well as for those involved in tax collection worldwide. Taxpayers can refer to the book to find out which rulings and concepts can help them enforce their rights; tax authorities and judges can use the book to verify which rights have to be respected.