Shu-Yi Oei
Hoffman F. Fuller Professor of Law, Tulane Law School

Over the past decade, a steady drip of tax leaks has begun to exert an extraordinary influence on how international tax laws and policies are made. The Panama Papers and Bahamas leaks are the most recent examples, but they are only the tip of the leaky iceberg. Other leaks include (in roughly chronological order) the UBS and LGT leaks; the Julius Baer leak; HSBC “SwissLeaks”; the British Havens leaks; and the LuxLeaks scandal.

These tax leaks have revealed the offshore financial holdings and tax evasion and avoidance practices of various taxpayers, financial institutions, and tax havens. In so doing, they have been valuable in correcting long-standing informational asymmetries between taxing authorities and taxpayers with respect to these activities. Spurred by leaked data, governments and taxing authorities around the world have gone about punishing taxpayers and their advisers, recouping revenues from offshore tax evasion, enacting new domestic laws, and signing multilateral agreements that create greater transparency and exchange of financial information between countries.

Thus, it is clear that leaked data has started to be a significant driver in how countries conduct cross-border tax enforcement and make international tax law and policy. But using leaks to direct and formulate tax policy responses comes with some potentially serious pitfalls.

In a new paper—coming soon to an SSRN near you[fn.1]—Diane Ring and I explore the social welfare effects of leak-driven lawmaking. Our argument, very generally, is that while data leaks can be socially beneficial by virtue of the behavioral responses they trigger and the enforcement-related laws and policies generated in their wake, there are under-appreciated downside hazards and costs to relying on leaked data in deterring tax evasion and making tax policy.

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