Taxation, Bank Leverage, and Financial Crises. By Ruud de Mooij, Michael Keen, and Masanori Orihara
IMF Working Paper No. 13/48
Feb 25, 2013
http://www.imf.org/external/pubs/cat/longres.aspx?sk=40341.0
Summary: That most corporate tax systems favor debt over equity finance is now widely recognized as, potentially, amplifying risks to financial stability. This paper makes a first attempt to explore, empirically, the link between this tax bias and the probability of financial crisis. It finds that greater tax bias is associated with significantly higher aggregate bank leverage, and that this in turn is associated with a significantly greater chance of crisis. The implication is that tax bias makes crises much more likely, and, conversely, that the welfare gains from policies to alleviate it can be substantial—far greater than previous studies, which have ignored financial stability considerations, suggest.
Introduction excerpts:
The onset of the financial crisis of 2008 quickly prompted many assessments of the role that taxation might have played.1 Their consensus was clear, but vague: tax distortions did not trigger the crisis, but may have increased vulnerability to financial crises. Prominent among the reasons given for this was ‘debt bias’: the tendency toward excess leverage induced, in almost all countries, by the deductibility against corporate taxation of interest payments but not of the return to equity.2 By encouraging firms to finance themselves by debt rather than equity, this might have made them more vulnerable to shocks and so increased both the likelihood and intensity of financial crises. The point applies in principle to all firms, but is a particular concern in relation to financial institutions; and these are the focus here.
This potential link from tax design to financial crises is now widely recognized. But analysis has not progressed beyond metaphor and speculation. Shackelford, Shaviro, and Slemrod (2010, p. 784), for instance, stress “the possibility that the tax biases served…as extra gasoline intensifying the explosion once other causes lit the match”, and the European Commission that “The welfare costs related to debt bias might not be negligible [because] excessive debt levels increase the probability of default” (European Commission, 2011; p. 7), with both the ‘might’ and the ‘not negligible’ leaving much doubt and imprecision. This paper aims to provide a first attempt to establish and quantify an empirical link between the tax incentives that encourage financial institutions (more precisely, banks, the group for which we have data) to finance themselves by debt rather than equity and the likelihood of financial crises erupting; and then to try to quantify the welfare gains that policies to address this bias might consequently yield.
The approach is to combine two elements in a causal chain. The first is that between the statutory corporate tax rate and banks’ leverage. This has received substantial attention in relation to nonfinancial firms,3 but very little in relation to the financial sector. Keen and De Mooij (2011), however, show that for banks too a higher corporate tax rate, amplifying the tax advantage of debt over equity finance, should in principle lead to higher levels of leverage; the presence of capital regulations does not affect the usual tax bias applying, so long as it is privately optimal for banks to hold some buffer over regulatory requirements (as they generally do). Empirically too, Keen and de Mooij (2012) find that, for a large crosscountry panel of banks, tax effects on leverage are significant—and, on average, about aslarge as for nonfinancial institutions. These effects are very much smaller, they also find, for the largest banks, which generally account for the vast bulk of all bank assets. One task in this paper is to explore these findings further, using data now available to extend coverage into the crisis period that began in 2008—enabling a comparison of tax impacts pre- and post-onset—and applying the same estimation strategy to country-level data for the OECD.
Importantly, the finding that tax distortions to leverage are small for the larger banks, which are massively larger than the rest, does not mean that the welfare impact of tax distortions is in aggregate negligible: even small changes in the leverage of very large banks could have a large impact on the likelihood of their distress or failure, and hence on the likelihood of financial crisis.
This is where the second link in the causal chain explored here comes in: that between the aggregate leverage of the financial sector and the probability of financial crisis.4 We estimate such a relationship for OECD countries, applying the estimation strategy of Barrell et al. (2010) and Kato, Kobayashi, and Saita (2010) but, in contrast to these earlier studies, capturing data on the recent financial crisis from Laeven and Valencia (2010). The results suggest sizeable and highly nonlinear effects of aggregate bank leverage on the probability of financial crisis.
Combining the results from these two estimating equations enables simple calculations of the impact of a variety of tax reforms on the likelihood of financial crisis. Linking this, in turn, with estimates of the output loss that is historically associated with such crises gives some rough sense of the potential welfare gains from policies that mitigate debt bias in the financial sector. Putting aside the overarching debate as to the proper roles of taxation and regulation in addressing the potential for excess leverage in the financial sector,5 we consider three tax reforms that would reduce the tax incentive to debt finance: a cut in the corporate tax rate; adoption of an Allowance for Corporate Equity form of corporate tax (which would in principle eliminate debt bias); and a ‘bank levy’ of broadly the kind that a dozen or so countries have introduced since the crisis.6
All this gives a very different perspective on the nature and possible magnitude of the welfare costs associated with debt bias. Previous work, which has not reflected considerations of financial stability, has concluded that these are small: Gordon (2010) estimates the total efficiency loss from debt bias in the U.S. to be less than 1 percent of corporate income tax (CIT) revenue and concludes that: “tax distortions from corporate financial policy are not an important consideration when setting tax policy”; Weichenrieder and Klautke (2008) put the marginal welfare loss from debt bias somewhat higher, but still only at 0.06–0.16 percent of the capital stock. The question here is whether considerations of financial stability imply much higher welfare losses—and the conclusion will be that it seems they do.
Conclusion
The analysis here is in several respects simplistic and limited. In particular, we have not uncovered a direct link between tax incentives favoring debt finance and the probability of financial crisis. But the evidence presented here does suggest the real possibility of such a connection. If debt bias leads to higher aggregate bank leverage than would otherwise be the case—and it seems that it does—and if higher aggregate bank leverage makes financial crisis more likely—and it seems that it does—then debt bias increases the chances of financial crisis. This, in turn, can imply welfare gains from mitigating debt bias far higher than the small amounts found in previous work: noticeably more, in some of the calculations reported here, than 1 percent of GDP. Regulation, of course, has historically had the dominant role in addressing such problems of excess leverage in the financial sector, and the higher and tighter capital requirements of Basel III should to some degree reduce the welfare costs of debt bias. How much comfort is taken from this will depend on one’s evaluation of these reforms. What the evidence assembled here suggests, however, is that the tax incentive encouraging banks to use debt finance is not just an inelegant inconsistency with regulations intended to do the exact opposite, but a potential risk to be recognized, and, as need be, addressed, in the pursuit of financial stability.
The global financial crisis has highlighted the destructive impact of misaligned incentives in the financial sector. This includes bank managers’ incentives to boost short-term profits and create banks that are “too big to fail”, regulators’ incentives to forebear and withhold information from other regulators in stressful times, credit rating agencies’ incentives to keep issuing high ratings for subprime assets, and so on. Of course, incentives play an important role in many economic activities, not just the financial ones. But nowhere are they as prominent, and nowhere can their impact get as damaging as in the financial sector, due to its leverage, interconnectedness, and systemic importance. A large body of recent literature examines these issues in depth. For example, Caprio, Demirgüç-Kunt and Kane (2008) show that incentive conflicts explain how securitization went wrong and why credit ratings proved so inaccurate; Barth, Caprio and Levine (2012) highlight incentive failures in regulatory authorities. Incentives were not the only factor – they were accentuated by problems of insufficient information, herd behavior, and so on – but breakdowns in incentives had clearly a central role in the run-up to the crisis.
Despite the broad agreement among economists, the focus of financial sector regulation and supervision has often been on other things, leaving incentives to be addressed indirectly at best. At the global level, substantial efforts have been devoted to issues such as calibrating risk weights to calculate banks’ minimum capital requirements. Numerous outside observers have called for more concerted efforts to address the incentive breakdowns that led to the crisis (e.g., LSE 2010; Squam Lake Working Group 2010; and Beck 2010). At the individual country level, regulatory changes have taken place in recent years, but in-depth analyses show a major scope to better address incentive problems (see ÄŒihák, Demirgüç-Kunt, MartÃnez PerÃa, and Mohseni 2012, based on data from the World Bank’s 2011–12 Bank Regulation and Supervision Survey). The World Bank’s 2013 Global Financial Development Report also called for more vigorous steps to address incentive issues, rather than leaving them as an afterthought.
In a recent paper, joint with Barry Johnston, we propose a pragmatic approach to re-orienting financial regulation to have at its core addressing incentives on an ongoing basis. The paper, which of course represents our views and not necessarily those of the World Bank, proposes “incentive audits” as a tool to help in identifying incentive misalignments in the financial sector. The paper is an extended version of an earlier piece recognized by the International Centre for Financial Regulation and the Financial Times among top essays on “what good regulation should look like“.
The incentive audit approach aims to address systemic risk buildup directly at its source. While traditional, regulation-based approaches focus on building up capital and liquidity buffers in financial institutions, the incentive-based approach seeks to identify and correct distortions and frictions that contribute to the buildup of excessive risk. It goes beyond the symptoms to their source. For example, the buildup of massive risk concentrations before the crisis could be attributed to information gaps that prevented the assessment of exposures and network risks, to incentive failures in the monitoring of the risks due to conflicts of interest and moral hazard, and to regulatory incentives that encouraged risk transfers. Building up buffers can help, but to address systemic risk effectively, it is crucial to tackle the underlying incentives that give rise to it. Focusing on increasingly complex capital and liquidity charges has the danger of creating incentives for circumvention, and can run into limited capacity for implementation and enforcement. In the incentive-based approach, more emphasis is given on methods for identifying incentive failures resulting in systemic risk. The remedies go beyond narrowly defined prudential tools and include also other measures, such as elimination of tax incentives that encourage excessive borrowing.
What would an incentive audit involve? It would entail an analysis of structural and organizational features that affect incentives to conduct and monitor financial transactions. It would comprise a sequenced set of analyses proceeding from higher level questions on market structure, government safety nets and legal and regulatory framework, to progressively more detailed questions aimed at identifying the incentives that motivate and guide financial decisions (Figure 1). This sequenced approach enables drilling down and identifying factors leading to market failures and excessive risk taking.
The incentive audit is a novel concept,
but analysis of incentives has been done. One example is the report of a
parliamentary commission examining the roots of the Icelandic financial
crisis. The report (Special Investigation Commission 2010)
notes the rapid growth of Icelandic banks as a major contributor of the
crisis. It documents the underlying “strong incentives for growth”,
which included the banks’ incentive schemes and the high leverage of
their owners. It maps out the network of conflicting interests of the
key owners, who were also the largest debtors of these banks. Another
example of work that is close to an incentive audit is the analysis by
Calomiris (2011). He examines incentive failures in the U.S. financial
market, and identifies a subset of reforms that are “incentive-robust,”
that is, they improve market incentives, market discipline, and
incentives of regulators and supervisors by making rules and their
enforcement more transparent, increasing credibility and accountability.
These examples illustrate that an incentive audit is doable and useful.
Who would perform incentive audits? Our paper offers some suggestions. The governance of the institution performing the audits is important--its own incentives to act need to be appropriately aligned. Also, to be effective, incentive audits would have to be performed regularly, and their outcomes would have to be used to address incentive issues by adapting regulation, supervision, and other measures. In Iceland, the analysis of incentives was a part of a “post mortem” on the crisis, but it is feasible to do such analysis ex-ante. Indeed, much of the information used in the above mentioned report was available even before the crisis. The Commission had modest resources, illustrating that incentive audits need not be very costly or overly complicated to perform. As the Commission’s report points out, “it should have been clear to the supervisory authorities that such incentives existed and that there was reason for concern,” but supervisors “did not keep up with the rapid changes in the banks’ practices”. Instead of examining the reasons for the changes, the supervisors took comfort in banks’ capital ratios exceeding a statutory minimum and appearing robust in narrowly-defined stress tests (ÄŒihák and Ong 2010).
An incentive audit needs to be complemented by other tools. It needs to be combined with quantitative risk assessment and with assessments of the regulatory, supervisory, and crisis preparedness frameworks. The audit provides an organizing framework, putting the identification and correction of incentive misalignments front and center.
Incentive audits are not a panacea, of course. Financial markets suffer from issues that go beyond misaligned incentives, such as limited rationality, herd behavior and so on. But better identifying and addressing incentive misalignments is a key practical step, and the incentive audits can help.
References
Barth, James, Gerard Caprio, and Ross Levine. 2012. Guardians of Finance: Making Regulators Work for Us, MIT Press.
Beck, Thorsten (ed). 2010. Future of Banking. Centre for Economic Policy Research (CEPR). Published by vox.eu.
Caprio, Gerard, Asli Demirgüç-Kunt, and Edward J. Kane. 2010. “The 2007 Meltdown in Structured Securitization: Searching for Lessons, not Scapegoats.” World Bank Research Observer 25 (1): 125-55.
Calomiris, Charles. 2011. Incentive‐Robust Financial Reform, Cato Journal 31 (3): 561–589.
ÄŒihák, Martin, Asli Demirgüç-Kunt, Maria Soledad MartÃnez PerÃa, and Amin Mohseni. 2012. “Banking Regulation and Supervision around the World: Crisis Update.” Policy Research Working Paper 6286, World Bank, Washington, DC.
ÄŒihák, Martin, Asli Demirgüç-Kunt, and R. Barry Johnston. 2013. “Incentive Audits: A New Approach to Financial Regulation.” Policy Research Working Paper 6308, World Bank, Washington, DC.
ÄŒihák, Martin, and Li Lian Ong. 2010. “Of Runes and Sagas: Perspectives on Liquidity Stress Testing Using an Iceland Example.” Working Paper 10/156, IMF, Washington, DC.
London School of Economics. 2010. The Future of Finance: The LSE Report. London: London School of Economics.
Special Investigation Commission. 2010. Report on the collapse of the three main banks in Iceland. Icelandic Parliament, April 12.
Squam Lake Working Group. 2010. Regulation of Executive Compensation in Financial Services. Squam Lake Working Group on Financial Regulation
World Bank. 2012. Global Financial Development Report 2013: Rethinking the Role of the State in Finance, World Bank, Washington DC.