Reuven S. Avi-Yonah's recent article, Tax Competition, Tax Arbitrage, and the International Tax Regime, is an interesting explanation of his theory of a coherent international tax regime. Just as I have argued that the Code provisions and the various administrative and judicial authorities interpreting them cohere in a system of rules that are required to be interpreted (and followed) with a view to their structural coherence based on fundamental principles (including, e.g., conservation of basis, the anti-manipulation value that underlies disallowance of artificial losses, etc.), Avi-Yonah argues that the treaties and domestic tax laws of the major nations involved in global commerce create a coherent international tax regime founded on important underlying norms that amounts to customary international law and is binding even in the absence of treaties. Those two norms are the "single tax principle" (income should be tax once but not more than once) and the benefits principle" (active business income should be taxed primarily at source, and passive investment income should be taxed primarily at residence). He notes that the tax competition and tax arbitrage of recent years that violate those norms provide evidence that the norms exist, because of the concerted efforts by the OECD, WTO, EU and various tax administrations (including, sporadically, in the US) to combat those challenges.
The reaction to his assertion of an international regime has been much the same as the reaction to assertions of structural coherence in our domestic tax system--strong skepticism, fed by the apparent variety of rules and mechanisms by which different items are taxed in our domestic system or different categories of income are treated as part of the base in various systems around the world.
The tax laws of countries vary and the treaties for international taxation vary as well. Yet the pattern of convernge is pronounced, especially in the area of international taxation where differing domestic regimes must interact and where the network of 2000 treaties based on the UN and OECD models have led to considerable similarity. Now that "every developed country ...tends to tax currently passive income earned by its residents overseas (thorugh controlled foreign corporations and foreign investment funds... and to exempt or defer active business income, ...the distinction between countries that assert worldwide taxing jurisdiction and those that only tax territorially has lost much of its force." Id. at 5. Similar rules exist for non-discrimination, arm's length transfer pricing, and foreign tax credits versusd deductions. As a result, "the freedom of most countries to adopt international tax rules is severely constrained, even before entering into any tax treaties, by the need to adapt to generally accepted principles of international taxation. Even if divergent rules have been adopted, the process of integration into the world economy forces change." at 7. Avi-Yonah asserts that this international tax regime "rises to the level of customary international law."
Perhaps the most interesting portion of the article is Avi-Yonah's discussion of the normative basis for the two international norms (single tax principle and benefits principle). Underlying the single tax principle is the accepted international norm of both personal and corporate income taxes. As a result, to maintain equity--especially on domestic labor income--it is important to avoid both double taxation and zero taxation of cross-border income. Double taxation would lead to too-high tax rates and stifle international investment, while zero-taxation would create opportunities for avoiding domestic taxation by investing abroad and eroding the national tax base (and harming less mobile wage earners). "In a world in which international trade and investment are important, but taxes (unlike tariffs) cannot be reduced to zero, the Single Tax Principle is the best option." at 20
Similarly, Avi-Yonah founds the active-source/passive-residence "benefits" principle on the notion that individuals primarily earn investment income and corporations primarily earn busienss income. Residence-based taxation makes the most sense for individuals--it is easy to define, residence overlaps political allegiance, and distributive principles can be most easily addressed by country of residence. Source-based taxation makes the most sense for corporations--residence is meaningless or formalistic, multinationals have no allegiance to a particular society, and multinationals exert significant political influence in various jurisdictions so taxing "foreign" multinationals is appropriate. And source-based taxation is consistent with the benefits theory of tax justification. It also would be hard to prevent source taxation of businesses.
The paper deals with three threats to the international regime--zero taxation of passive income due to tax haven activity; tax competition for active investment; and tax arbitrage. Regarding the first, Avi-Yonah notes that the US enactment of the portfolio interest exemption led to a trend not to tax passive income (interest, rents, royalties, capital gains and even dividends) at source. That, combined with the existence of tax havens made it hard for residence countries to tax passive income as well, leading to zero taxation in violation of the Single Tax Principle. Recent steps to encourage better information reporting may be making a difference, but Avi-Yonah proposes instead a coordinated withholding tax that is refundable upon a showing that the income has been declared in the residence country.
As to tax competition, Avi-Yonah is more optimistic than Julie Roin, Robert Peroni and Craig Boise at the January meeting of the AALS. (There, the concern was whether an income tax could survive globalization, but the problems caused by tax havens and tax arbitrage were a looming part of the problem.) The OECD countries have been reducing the threshold for finding a permanent establishment, making it hard for multinationals to avoid being subject to tax. And the OECD is putting pressure on members and non-members to abolish tax havents and abandon tax sparing rules that foster double-non-taxation. Avi-Yonah suggests that the "trend will continue until effective residence-based taxation by OECD members stops developing countries from engaging in harmful tax competition."
Finally, as for tax arbitrage, Avi-Yonah considers anti-conduit developments since 1984--when the US terminated its treaty with the Netherlands-Antilles because it did not tax on a residence basis--to show a consensus that rejects it. Other US developments--the dual consolidated loss rule, the reverse hybrid rule in section 894(c), and recent regulations on tax arbitrage transactions involving foreign tax credits--show a growing desire to stifle arbitrage as inappropriate.
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