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Publicly Available Published by De Gruyter Oldenbourg February 7, 2018

Quantifying International Tax Avoidance: A Review of the Academic Literature

Nadine Riedel
From the journal Review of Economics


This paper provides a brief review of the academic literature that assesses the quantitative importance of tax avoidance behaviour of multinational entities (MNEs) by means of income shifting from high-tax to low-tax affiliates. Existing studies unanimously report evidence in line with tax-motivated profit shifting (despite using different data sources and estimation strategies). In terms of shifting channels, there is evidence consistent with strategic mispricing of intra-firm trade, the location of valuable intellectual property at low-tax affiliates and debt-shifting activities. The quantitative estimates vary across approaches and studies though. The paper moreover stresses that some care should be warranted when interpreting profit shifting estimates as they often rely on non-trivial assumptions.

JEL Classification: H2; H7

1 Introduction

With the emergence of the financial crisis and increasing fiscal strains in many countries, reports of multinational enterprises (MNEs) like Google, Apple, Starbucks and Ikea engaging in significant international tax avoidance activities triggered public outrage, with the media, NGOs and politicians heavily criticizing their “lousy behaviour“ (Larry Elliot in The Guardian (2013)) and labelling them to be modern “Robber Barons“ (John Simpson in The Telegraph (2012)).

Companies defended themselves by stressing that they fully abided by the tax law and that it is the role of the legislator to close existing loopholes for multinational tax avoidance activities. Anecdotal evidence points to many of these loopholes and suggests that firms set up complicated international tax structures to shift income from high-tax to low-tax locations, including the mis-pricing of intra-firm trade, the strategic location of valuable intellectual property (IP) at low-tax affiliates and debt-shifting arrangements, where low-tax entities lend to high-tax affiliates to strip out tax-deductible interest payments. [1] Mandated by the G20, the OECD responded to public concerns about this type of aggressive international tax avoidance and developed an action plan to combat base erosion and profit shifting, which was endorsed by the G20 group in 2015.

As many anti-shifting provisions do not only deter MNEs’ tax planning schemes but may also distort underlying business activity, increase firms’ double taxation risk and raise compliance and enforcement costs, their welfare consequences depend on the extent to which MNEs actually do engage in tax avoidance behaviour. Against this background, the purpose of this paper is to go back one step and ask whether profit shifting is indeed a systematic and quantitatively important phenomenon that goes beyond the singular cases that were prominently featured in the media.

2 Descriptive evidence

One may be tempted to jump to conclusions very quickly and argue that the observed presence of many MNEs in tax haven countries and their low aggregate effective corporate tax rates already prove the point. [2] Some words of caution are warranted though. Low effective tax rates may also (partly) relate to non-avoidance activities, e. g. to high levels of tax-deductible investment expenses or loss-carryforwards. Tax havens moreover do not only woo firms with low tax rates but often provide good governance institutions, attractive public infrastructure and well-developed financial service and labour markets (see e. g. the economically important tax havens of Switzerland and Ireland). The corporate decision to locate investments in these countries may thus be driven by other determinants than corporate tax avoidance considerations.

3 Indirect evidence: pre-tax profits and corporate tax rates

Researchers have thus tried to develop better empirical strategies to identify multinational shifting behaviour. As MNEs have an incentive to hide avoidance activities from the public and corporate reporting requirements do not establish full transparency, existing strategies are necessarily indirect and present no “smoking gun“ in the narrow sense of the word.

The most common approach pursued in the literature is to compare pre-tax profits of high-tax and low-tax affiliates as income shifting reduces the former and increases the latter. Survey evidence for US MNEs (provided by Bureau of Economic Analysis (BEA)) for example points to strongly elevated pre-tax profitability rates at tax-haven affiliates (see e. g. Sullivan (2004) and Clausing (2011)). Unfortunately, this pattern may also be an artefact of the BEA’s data structure (see Altshuler and Grubert (2006) and footnote 3 for details) [3] or may reflect variation in other profit-determinants that differ across host countries and affiliates (e. g. differences in worker productivity, public good provision or market competition).

The literature accounted for these shortcomings by making use of other firm databases (often drawing on accounting information) and by estimating empirical models that control for country and affiliate-specific profit-determinants. While early papers compare pre-tax profitabilities of high-tax and low-tax affiliates, more recent papers analysed changes in affiliates’ reported pre-tax profitability in response to corporate tax reforms. The benefit of the latter approach is that time-constant unobserved differences across entities cannot confound the results.

Studies unanimously report an inverse relation between the corporate tax rate (difference) and affiliates’ reported pre-tax profits. The size of the estimates varies across papers though. Heckemeyer and Overesch (2017) conduct a meta-analysis and present a semi-elasticity of 0.8 as a consensus estimate, implying that an increase in the host country’s corporate tax (difference to foreign group locations) of 10 percentage points lowers affiliates’ reported pre-tax profits by 8 %. Thus, from every 1000 Euros earned at a high-tax location, MNEs would transfer 80 additional Euros to lower-tax entities after the increase in the corporate tax rate (differential).

While these findings are commonly interpreted as evidence for multinational income shifting, a number of caveats have to be kept in mind. To see this, let’s do a thought experiment and assume that MNEs did not engage in income shifting. Are there other mechanisms that may establish a link between corporate taxes and affiliates’ reported pre-tax profitability? Three candidates:

Firstly, MNEs may have an incentive to strategically sort high return projects to low-tax affiliates and vice versa. While no separation of economic activity and taxable income (“paper profit shifting”) is involved, the mechanism establishes a negative correlation between corporate taxes and reported pre-tax profitability. Secondly, high corporate taxes may imply that MNEs require a higher pre-tax return in order to invest in a country, which establishes a positive correlation between taxes and reported pre-tax profitability. Thirdly, corporate taxation may affect affiliates’ pre-tax profits through changes in effort provision. [4] As owners can keep less of earned income when corporate taxes rise, manager-owners may exert less effort or, with separation of management and ownership, adjust staff’s incentive contracts. Again, this gives rise to a negative correlation between pre-tax profits and corporate tax rates. [5]

Interpreting the above estimates as evidence for paper profit shifting hence assumes that these mechanisms are of minor importance. If they are not, the estimates may understate (see second argument) or overstate (see first and third argument) the true extent of profit shifting. [6]

The approach has been used to quantify the revenue losses from income shifting for the US. Clausing (2009, 2011)) estimates that revenue costs in 2004 and 2008 amounted to $60 and $90 billion respectively or about 30 % of US corporate tax revenues. The findings should be interpreted with some care though since the above methodological caveats apply and the tax-sensitivity of corporate profits underlying Clausing’s estimates is large compared to other papers (3.3 relative to the 0.8-semi-elasticity consensus estimate in Heckemeyer and Overesch (2017)). [7] Based on a similar approach, the final report for the OECD BEPS Action 11 estimates that the global corporate tax revenue lost from BEPS amounts to $100–240 billion or 4–10 % of corporate tax revenues (OECD (2015)).

4 Alternative approaches: profitability shocks and corporate twins

The literature has proposed two alternative approaches to test for multinational income shifting. Both approaches do not rely on identification based on variation in corporate tax rates and are hence not prone to the identification concerns sketched above.

The first approach, proposed by Dharmapala and Riedel (2013), exploits profitability shocks to multinational affiliates as a source for empirical identification. The authors argue that, if MNEs engage in tax-motivated income shifting, positive profit shocks at high-tax locations should partly translate into higher reported income at the group’s low-tax affiliates (but not at other high-tax affiliates). Using data on European firms, profitability shocks are modelled by changes in industry profitability in a given country. The findings suggest that MNEs shift around 2 % of the additional income to lower tax entities. Three features of the data and model set-up suggest that the estimate is a lower bound to the true effect: firstly, the authors construct profit shocks to parent firms and investigate whether these are transmitted to lower-tax subsidiaries. Previous papers (Dischinger, Knoll, and Riedel (2014)) suggest though that MNEs are more reluctant to shift income away from their headquarters location than from high-tax subsidiaries. Secondly, the observed average tax rate differential between parents and lower-tax subsidiaries is relatively small in the authors’ data, implying limited shifting incentives. Thirdly, for conceptual reasons, the study disregards subsidiaries that operate in the same industry as their parent (since they may be subject to the same profitability shock). If a significant fraction of profit shifting takes place between entities in the same sub-industry, e. g. related to high levels of intra-firm trade and much leeway in setting tax-favorable transfer prices, this is not captured in the analysis and observed profit relocations may mainly reflect debt-shifting behavior. [8]

The second alternative approach to quantify tax losses through international income shifting was proposed by Egger, Eggert, and Winner (2010) and Finke (2013). Using firm level data for Europe and Germany respectively, the authors aim to identify income-shifting behaviour by comparing corporate tax payments of multinational and national enterprises (NEs). As MNEs and NEs may differ in various other tax-determining characteristics, the authors employ matching techniques to identify similar twins in the two subgroups (as determined by firm characteristics, e. g. age, size, industry and productivity as well as host region characteristics). Both papers report large differences between corporate taxes paid by comparable MNEs and NEs. Egger et al. find that, in European high-tax countries, the corporate tax burden on MNEs is more than 30 % lower than the burden on NEs. For Germany, Finke (2013) suggests a gap of 27 % in 2007, which declined after the 2008 corporate tax reform, presumably related to the reduction in the headline corporate tax rate and the implementation of tighter thin-capitalization rules. The Achilles’ heel of the approach is that these matching estimates are biased if tax-determinants, which are unobserved by researchers, systematically differ between MNEs and NEs. MNEs’ managements may e. g. be more aggressive in exploiting tax-planning opportunities than NEs’ managements. MNEs may also engage in more extensive government lobbying than NEs and, in consequence, receive more firm-specific tax benefits (e. g. through laxer tax audits). [9] On top, to prevent mobile MNEs from relocating investment to foreign countries, governments may grant firm-specific tax reductions to multinationals (as acknowledged in Egger, Eggert, and Winner (2010)). All three arguments suggest that part of the observed gap in tax payments may be driven by other mechanisms than international tax avoidance of MNEs.

5 Other estimates: tax authorities and ngos

On top, several tax authorities estimate corporate tax revenue gaps related to avoidance behaviour (commonly not distinguishing between international and national avoidance though – or even pooling avoidance activities with illegal evasion, filing errors and criminal activity). In the United Kingdom, the British HM Revenue and Customs (HMRC) determined a tax avoidance gap for large businesses of £1.1 billion in 2012/13 or 5 % of the firms’ theoretical tax liabilities (£0.1 billion for small and medium-sized firms), see HMRC (2014). [10] This is likely a lower bound to the true gap as their analysis relies on internal knowledge from HMRC’s case management systems and tax specialists are unlikely to identify all avoidance schemes.

As an alternative strategy, TUC (2008) and The Guardian (2009) proposed to quantify revenue losses from multinational tax avoidance for the UK by comparing the amount of tax paid as declared in firms’ accounts with an estimate of the tax due. As stressed in Miller (2013) and others, the shortcoming of this approach is that it does not account for the deliberate elements in the structure of the tax system that lead to a reduction in tax liabilities (such as capital allowances, the R&D tax credit and loss carry-forwards) or the genuine commercial reasons why taxes may be paid in other jurisdictions. Thus, while their tax gap estimates are substantially larger than those in the HMRC analysis – for 2006, TUC (2008) e. g. estimates an avoidance gap of £12 billion in the UK – they are likely overstated (and possibly by a wide margin). [11]

6 Analysing specific relocation channels

Another strand of the literature tries to account for the discussed shortcomings by investigating specific income shifting channels. As sketched in the Introduction, prominent international tax avoidance strategies include the mispricing of intra-firm trade, strategic location of valuable IP at low-tax locations and debt-shifting activities. [12]

The literature on tax-motivated distortions of MNEs’ transfer prices compares prices for intra-firm and extra-firm trade within specific industries or product groups. The seminal work by Clausing (2003) uses US trade data and finds that a 1 %-drop in the foreign tax rate reduces intra-firm export prices by a large 1.8 %. Bernard, Jensen, and Schott (2006) confirm this result. [13]Cristea and Nguyen (2016) study trade pricing of Danish firms before and after they set up their first foreign subsidiary. [14] After owning an affiliate in a low-tax country, MNEs are found to reduce prices for exports from Denmark by 5.7 percent. The associated loss in tax income equals 3.2 % of Danish MNEs’ tax returns. This is likely a lower bound to the true effect though as the analysis is limited to manufacturing trade and hence disregards many IP-related transactions that offer large mispricing opportunities (see e. g. Grubert (2003), Dischinger and Riedel (2011), Beer and Loeprick (2014)). Recently, Davies et al. (2018) reported similar evidence for France, stressing, however, that the lion’s share of income shifting relates to a minority of only 400 multinational groups (and their export flows to tax haven economies).

A number of recent papers moreover suggest that the location of valuable intangible property is systematically distorted towards low-tax locations (see Dischinger and Riedel (2011)). Karkinsky and Riedel (2012) use data on corporate patent holdings of European multinational firms and find that the location of patents across group affiliates strongly responds to tax incentives, with a 1 %-increase in the corporate tax rate lowering patent holdings by around 3.5 % (see Griffith, Miller, and O’Connell (2014) and Alstadsæter et al. (2017) for similar evidence). Baumann et al. (2017) furthermore suggest that MNEs strategically relocate patents with above average value to tax havens.

Empirical evidence furthermore confirms that MNEs engage in debt-shifting behaviour. While both MNEs and NEs have an incentive to shield their profits from taxation by debt financing, MNEs may additionally inject equity into low-tax subsidiaries, which then lend to high-tax affiliates and strip-out tax-deductible interest without raising the group’s overall debt-to-equity ratio (and hence its bankruptcy risk). Existing papers test for debt-shifting based on firm level data and by regressing affiliates’ internal debt-holdings on the host country’s corporate tax rate or the tax differential to other group affiliates respectively (see e. g. Altshuler and Grubert (2003), Desai, Foley, and Hines (2004), Büttner and Wamser (2013), Møen et al. (2012)). [15] Reported semi-elasticities are around 1, suggesting that a 10-percentage point increase in the local statutory tax rate is associated with a 10 % increase of the affiliate’s internal debt-ratio. [16] As internal debt holdings tend to be small and the transferred income is the product of internal debt and the interest rate, the estimates, overall, imply relatively small debt-shifting volumes (see e. g. Büttner and Wamser (2013) and Dharmapala (2014)). A recent meta-analysis by Heckemeyer and Overesch (2017) confirms this notion (suggesting that debt-shifting makes up around 30 % of overall income shifting activities and mispricing of intra-firm trade makes up around 70 %). [17]

7 Conclusions

Researchers have taken various routes to identify tax-motivated international income shifting. As MNEs have an incentive to hide avoidance activities from the public, identification approaches are indirect and rely on a number of assumptions, which – if violated – lead to biased estimates. Studies unanimously report qualitative evidence in line with international tax avoidance behaviour. The quantitative estimates vary across approaches though, with results at the lower (upper) end suggesting that MNEs transfer less than 5 % (30 % or more) of their income earned at high-tax affiliates to lower-tax entities. While the range of estimates is wide, academic evidence points to smaller shifting volumes in the population of (medium-sized and large) [18] MNEs than recent media reports which feature groups with virtually no taxable income in high-tax countries (e. g. Daily Mail (2013), City AM (2014)). The most convincing empirical evidence has been presented by academic studies that investigate specific profit shifting channels as their empirical tests are more direct and offer less room for results being driven by mechanisms unrelated to income shifting. The latter studies are still scarce though and evidence on some BEPS strategies, e. g. hybrid mismatch arrangements, is completely missing. It is thus too early to draw final conclusions on the quantitative importance of international tax avoidance activities. Whether the upcoming years will see progress in quantifying BEPS (and assessing the effectiveness of anti-shifting provisions in limiting multinational income shifting behaviour) will critically depend on whether researchers can access high-quality data that allows identifying MNEs’ reported tax bases, tax liabilities/tax payments and business activity across group locations. While tax authorities in many countries have so far been restrictive in providing researchers access to anonymized corporate tax return and audit data, changing that policy might help to close prevailing knowledge gaps on the size of international tax avoidance.


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Published Online: 2018-02-07
Published in Print: 2018-08-28

© 2018 Oldenbourg Wissenschaftsverlag GmbH, Published by De Gruyter Oldenbourg, Berlin/Boston

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