One of the most significant trends in the evolution of global tax systems has been the rise from relative obscurity of thin capitalisation rules, which are perceived as anti-avoidance rules which limit tax base erosion from cross-border interest deductions. However, over the same timeframe, innovations to financial instruments have challenged the traditional financial and legal distinctions between debt and equity, which in the cross-border setting has exposed the prevalence of economic inefficiencies in the design of the international tax system.
The advent of the global digital economy has increased opportunities for aggressive tax planning by multinational enterprises (‘MNEs’). Governments are increasingly faced with the competing objectives of remaining internationally competitive and encouraging foreign investment while also protecting their national tax bases. Two key trends have had a significant impact on the international tax debate. First, over the past three decades, the rise of MNEs and the prominence – and dominance – of inter-company trade as a proportion of global trade has fundamentally shifted the influence of individual governments’ tax policies. Second, even though corporate tax policy has traditionally been a field dominated by economists, there is now a shift towards ‘politicisation’ of the debate. The focus of this article is on the importance of legal practitioners and scholars in assisting with meaningful reform at the intersection of these two trends – and examining alternative theoretical approaches to tax policy. In doing so, this article also bridges two disciplines by combining legal analysis with linear optimisation modelling (to simulate a tax-minimising MNE’s behavioural responses to both existing and proposed tax legislation). Ultimately, it is hoped that this research will present a platform for further discussion on the tax treatment of cross-border intercompany transactions, and facilitate the development of improvements to both the tax law design and drafting.
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