On Thursday 1 December 2016 at 13.45 hrs, Francisco Sepulveda Ramirez will defend his doctoral thesis ‘Residence in Tax Treaties' at the Academy Building of Leiden University. Supervisor is Professor F.A. Engelen.

The study of tax law covers the tax system in its full width. It includes domestic, international and European tax law.

Loopholes in international tax legislation contribute to the misuse of tax rules by multinationals. Leiden University legal experts investigate how the complex national and international tax rules can be made more consistent in order to create a better tax system.

On Thursday 16 November, Dirk Broekhuijsen defended his doctoral thesis entitled ‘A multilateral tax treaty: designing an instrument to modernise international tax law’. The supervisors are Professor F.A. Engelen and Professor S.C.W. Douma.

In the past few years, an increasing number of multinationals have made the news for large-scale use of tax planning opportunities. The Organisation for Economic Collaboration and Development (OECD) and the European Commission are studying these cases closely and investigating whether the current concepts…

How do tax treaties have to be explained and implemented, and what role does the supranational regulatory process play in this? Which objectives are meant to be used in establishing tax regulations and to what extent are such legislative practices undertaken in a goal-oriented manner?.

When moving to The Netherlands, it is important to know whether you are considered a resident tax payer or non-resident tax payer. Both residents and non-residents are taxed on their taxable income. A number of criteria help determine your status as resident or non-resident.

When moving to The Netherlands, it is important to know whether you are considered a resident tax payer or non-resident tax payer. Both residents and non-residents are taxed on their taxable income. A number of criteria help determine your status as resident or non-resident.

Multinationals use loopholes in the tax treaties between different states. A possible solution would be to eliminate all these loopholes in one go by creating a central global treaty. Leiden researchers are investigating whether this kind of mega-treaty is feasible.

The master’s programme 'Fiscaal Recht' provides you with in-depth theoretical and practical knowledge on all the ins and outs of tax law.

Do you like solving complex legal puzzles? Do you like analysing problems? If so, the bachelor’s programme Fiscaal Recht is right for you.

In this PhD-thesis several new and existing data science application are described that are particularly focused on applications for tax administrations.

The Institute of Tax Law and Economics at Leiden Law School has three departments: the Department of Tax Law, the Department of Economics and the Department of Business Studies. The Institute brings together research and teaching at the point at which, on the one hand, law and, on the other, fiscal…

On 10 October 2018, Richard Resch defended his doctoral thesis 'The Interpretation of Plurilingual Tax Treaties'. The doctoral research was supervised by Prof. mr. C. van Raad.

Complex systems can be characterized as systems in which multiple components interact with each other, often in non-linear ways. The main goal of this research will be to investigate if and how the international tax system can be defined and modelled as a complex system. Approaching the international…

Assessing the feasibility and legitimacy of the current model of global tax governance and the role of the OECD and EU in international tax law-making.

On Friday 17 November 2017, H.E. Dr. María Fernanda Espinosa, Minister of Foreign Affairs and Human Mobility of the Republic of Ecuador gave a lecture on Fairness in Global Taxation at the Grotius Centre for International Legal Studies at Leiden University, Campus The Hague.

On Thursday 1 December 2016 at 13.45 hrs, Francisco Sepulveda Ramirez will defend his doctoral thesis ‘Residence in Tax Treaties' at the Academy Building of Leiden University. Supervisor is Professor F.A. Engelen.

On Thursday 16 November, Dirk Broekhuijsen will defend his doctoral thesis entitled ‘A multilateral tax treaty: designing an instrument to modernise international tax law’. The defence will take place at 15.00 hrs at the Academy Building of Leiden University. The supervisors are Professor F.A. Engelen…

Professor Sjoerd Douma has been named the top lecturer on Coursera, the best-known platform for online courses. Students gave him an average score of 9.8 - almost unheard of for a lecturer in International Tax Law.

Many academics who specialise in tax law also work for commercial tax consultancies. It would very much seem as though the combination of different roles can hamper independent research, says Jan Vleggeert in his inaugural lecture on 30 October. Tax avoidance and other hot topics therefore do not receive…

The Netherlands remains one of the most important locations when it comes to tax evasion. According to Tax Justice Network only the British Virgin Islands, the Cayman Islands and Bermuda play a greater role.

Researchers from the Department of Tax Law were lead authors of a report on corporate taxation and digitalization for the World Economic Forum.

Jan Vleggeert is a tax specialist with an independent and critical voice in the debate on tax avoidance by multinationals. His appointment commenced on 1 October 2019.

Hardly anyone likes paying tax. That's true for private citizens, but also for many multinationals. To maximise their profit, some companies stash their income in tax havens. How exactly does that work? And are there other options? Tax lawyers Jan Vleggeert and Tanja Bender explain.

The Panama Papers and Paradise Papers provide evidence that companies and individuals are evading tax on a large scale. Worldwide tax agreements can put a stop to this. But for the time being a treaty that will address the problem at its root is not in sight, in the opinion of legal expert Dirk Broekhuijsen.…

How much mortgage interest can I claim back according to law? Or maintenance payments, how much do the tax authorities let me deduct? Many citizens struggle with questions about the application of tax legislation. Roberto van den Heuvel investigated in what way tax legislation should provide clarity…

How can data science improve tax administration? Mark Pijnenburg, a senior data scientist at the Netherlands Tax and Customs Administration, decided to investigate this in a dissertation. He talks about his experiences: 'Sometimes a technique is scientifically interesting, but not applicable in real…

On 12 and 13 September 2019, the Institute of Tax Law and Economics from Leiden University hosted 29 PhD researchers from around the world to engage into collective discussions at the Multilateral Cooperation in International Tax Law seminar.

The coronavirus pandemic has spelt disaster for some businesses, while others have seen their profits soar. This has led to politicians to consider introducing a ‘corona’ tax where the winners from the pandemic will help the losers get back on their feet.

Jan van de Streek is a tax scholar who conducts research into the taxation of multinationals. His appointment will commence on 1 January 2021.

The Netherlands must introduce a lower limit for tax on profits to prevent major multinationals not paying tax on a structural basis.

Tech company Uber uses various tricks via the Netherlands to avoid paying tax on its profits. A $16 billion inter-company loan from Singapore has prompted questions with experts claiming the loan is not under arm’s length terms. MEP Paul Tang wants Brussels to investigate.