VoxEU Column Financial Regulation and Banking Exchange Rates

Foreign currency corporate borrowing: Risks and policy responses

Emerging market economies increasingly rely on foreign currency debt, leaving borrowing firms exposed to sudden stops and currency depreciations. This column examines the dynamics of corporate foreign currency borrowing in India using new firm-level data. It finds that interest rate differentials are a strong predictor of foreign currency debt issuance, particularly after the Global Crisis. After the ‘taper tantrum’ of 2013, the Reserve Bank of India introduced new macroprudential policies that were effective at mitigating the riskiest borrowing and reducing the vulnerability of Indian firms. 

Non-financial corporations in emerging market economies (EMEs) increasingly rely on foreign currency debt for financing. Since the global crisis of 2008, the amount of dollar-denominated debt of EME corporations has quadrupled.1 Research has shown that interest rate differentials between EMEs and the US have contributed significantly to this phenomenon (Bruno and Shin 2017). In essence, EME corporations prefer to borrow in foreign currency when there is a ‘carry’, meaning foreign interest rates are low relative to domestic interest rates. This carry trade borrowing leaves the firms exposed to sudden stops in capital flows and associated currency depreciations (Bruno and Shin 2020). More broadly, the accumulation of external debt on private balance sheets can lead or contribute to currency depreciation spirals and thereby poses risks for EME growth and financial stability (Acharya et al. 2015, Du and Schreger 2017). These include risks to domestic growth from large corporate distress and spillover effects on the domestic financial system.

Attention has therefore naturally turned to policy responses to these risks posed by the build-up of foreign currency debt. Theoretical contributions suggest that prudent macroprudential regulation can mitigate these risks (Acharya and Krishnamurthy 2019, Erten et al. 2020). However, such regulation might have leakages or unintended consequences that undo its intended effects (Ahnert et al. 2020). Ultimately, uncovering the effects of such policies requires empirical analysis. 

In a recent paper (Acharya and Vij 2021), we do just that by studying a specific instance of macroprudential regulation targeted at the foreign currency borrowing of non-financial corporations. Our setting is India, which as is typical of EMEs, has seen a sustained increase in dollar debt issued by non-financial corporations. Figure 1 shows the total amount of foreign currency debt outstanding and the Indian rupee/US dollar foreign exchange rate for the period between 2004 and 2019. Although the rupee has steadily depreciated against the dollar, the outstanding stock of dollar debt has steadily increased. 

In response to the rise in dollar debt, in 2015 India’s central bank, the Reserve Bank of India (RBI), lowered the maximum permitted interest rate at which Indian borrowers could borrow in foreign currency debt markets. This move was in the aftermath of the ‘taper tantrum’ episode of May-August 2013 in which India faced significant capital outflows and currency depreciation. The aim of reducing these interest rate caps for foreign currency debt was to restrict access to only those firms that could borrow at relatively low interest rates, presumably higher quality and lower risk borrowers, as these borrowers would be less likely to face rollover problems in a sudden stop.

Figure 1 Foreign currency corporate debt and Indian rupee/US dollar exchange rate


Notes: The figure shows the evolution of the rupee/dollar exchange rate and the stock of foreign currency debt outstanding from March 2004 to March 2019.

To examine the dynamics of corporate foreign currency borrowing and the effects of the macroprudential regulation, we construct a detailed data set on Indian firms that borrow abroad. We have data on every instance of foreign debt issuance (including amount, maturity, and debt type), matched to accounting and stock market data on the borrowing firms. Our final sample includes 1,786 firms that, on average, borrow twice during our sample period of 2004 to 2019. In our sample, 5% of the firms borrow more than ten times over the period.

We first examine the factors that explain borrowing in external markets. Some hypothesised reasons for borrowing abroad are: (1) exporters can naturally hedge their foreign currency borrowing through their revenues, (2) firms investing in foreign assets (e.g. oil and gas companies) want to finance those assets in the same currency (Caruana 2016), and (3) firms borrow abroad at a cheaper interest rate and invest it locally at higher interest rates (Shin and Zhao 2013). The third reason is a corporate carry trade that is profitable if the firm can unwind the trade before the currency depreciates or if the central bank steps in to prevent depreciation.

Our analysis shows that the carry trade motive plays an important role in foreign currency borrowing particularly in the period of low US interest rates following the global crisis. We define a Sharpe Ratio-like proxy for the profitability of the carry trade, which is the difference of short-term interest rates between India and the US normalised by the implied volatility of the exchange rate backed out from foreign exchange options. Figure 2 shows that our carry trade measure is positively correlated with the aggregate foreign currency debt issuance in the period following the global crisis. Our econometric results show that the same firm is more likely to borrow in foreign currency when the carry trade is more profitable in the post-crisis period. The carry trade does not explain borrowing in the period before the global crisis, pointing to the importance of US monetary policy easing in explaining global financial flows (Rey 2013).

Figure 2 Foreign currency debt issuance and the carry trade


Notes: The figure plots the total number of foreign currency debt issues each quarter against CT, a proxy for the profitability of the dollar carry trade. CT is the difference in three-month interest rates between India and the US scaled by the implied volatility of three-month foreign exchange options. The sample period is from January 2004 to September 2019. 

Stock market data show that the returns of Indian foreign currency borrowers become more sensitive to movements in the dollar/rupee exchange rate as they borrow more. This indicates that the borrowers are not fully hedging the foreign exchange risk that comes from the new debt. Firms that are more likely to borrow when the carry trade is more profitable, whom we call ‘carry trade borrowers’, see the most increase in risk. We use the taper tantrum episode as a natural experiment to analyse what happens to carry trade borrowers during periods of market stress. The taper tantrum of summer 2013 was caused by the US Federal Reserve announcements indicating that the tapering of quantitative easing was imminent. This led to a surge of capital outflows and asset price declines in EMEs (Sahay et al. 2014). Our event studies around taper announcements indicate that carry trade borrowers experience significantly larger equity market declines due to the announcement (Figure 3).

Figure 3 Taper tantrum event study


Notes: The figure shows the cumulative abnormal return (CAR) for stocks of foreign currency borrowers that borrow when the carry trade is more profitable relative to other foreign currency borrowers. The event date is 19 June 2013, a date on which Chairman Ben Bernanke of the US Federal Reserve indicated that tapering of quantitative easing would commence later in 2013. A multivariate market model is used for estimating abnormal returns with the NIFTY return proxying for the market return while INR/USD return proxies for FX return. The estimation window is 180 calendar days and ends five trading days before the event date.

In response to the taper tantrum, many EMEs significantly altered their macroprudential policy for the external sector by tweaking the capital control frameworks (Bergant et al. 2020, IMF 2020). India was one of them. We focus on the RBI’s reduction in 2015 of the maximum interest rate at which firms could borrow abroad. We find that this macroprudential policy action had significant effects on carry trade borrowing. Following the reduction in the interest rate cap, the carry trade profitability no longer significantly explains foreign currency borrowing. We show that following the policy change, firms with higher interest expenses and those with a higher import share of raw materials were the ones most affected. This shows that the regulation worked as intended by preventing the ex-ante riskiest borrowers from borrowing in foreign currency to take advantage of a carry trade.

We further confirm the efficacy of the macroprudential regulation by testing equity market reaction of foreign currency borrowers during periods of market stress following the interest rate cap change. We conduct tests analogous to our taper tantrum analysis for the period of market stress at the beginning of the Covid-19 pandemic. For EMEs, this period was characterised by unprecedented portfolio outflows and tightening of financing conditions (Corsetti and Marin 2020). In our event study analysis, we find that carry trade borrowers do not do any worse during this crisis compared to other borrowers. This suggests that under the new macroprudential regime, the risks arising from carry trade borrowing by Indian corporates has been substantially mitigated.

Overall, our results indicate that favourable global funding conditions are a much more significant determinant of foreign currency borrowing by EME corporations than individual firm-level factors. As we entered a new cycle of US monetary policy easing owing to the Covid-19 pandemic, foreign currency borrowing might have accelerated along with the attendant risks. As this cycle is turning with the firming up of US long-term interest rates, excessively risky foreign currency borrowing by corporates might hurt domestic growth and financial stability down the line as capital flows to EMEs retrench. Our analysis suggests that the proper targeting of capital controls in macroprudential regulation of the external sector can play an important role in reducing such vulnerability. 


Acharya, V V and A Krishnamurthy (2019), “Capital Flow Management with Multiple Instruments", in A Aguirre, M Brunnermeier and D Saravia (eds.), Monetary Policy and Financial Stability: Transmission Mechanisms and Policy Implications, Vol. 26 of Central Banking, Analysis, and Economic Policies Book Series, Chapter 6, p. 169-203, Central Bank of Chile.

Acharya, V V, S Cecchetti, J De Gregorio, S Kalemli-Ozcan, P R Lane and U Panizza (2015), Corporate Debt in Emerging Economies: A Threat to Financial Stability? Report for the Committee on International Economics Policy and Reform (CIEPR), p. 1-53, Brookings Institute and Centre for International Governance Innovation.

Acharya, V V and S Vij (2021), “Foreign Currency Borrowing of Corporations as Carry Trades: Evidence from India", NBER Working Paper 28096.

Ahnert, T, K Forbes, C Friedrich and D Reinhardt (2020), “Macroprudential FX regulations: Shifting the snowbanks of FX vulnerability?", Journal of Financial Economics 140(1): 145-174.

Bergant, K, F Grigoli, N-J Hansen and D Sandri (2020), “Macroprudential regulation can effectively dampen global financial shocks in emerging markets?",, 12 August.

Bruno, V and H S Shin (2017), “Global Dollar Credit and Carry Trades: A Firm-Level Analysis", The Review of Financial Studies 30(3): 703-749.

Bruno, V and H S Shin (2020), “Currency Depreciation and Emerging Market Corporate Distress", Management Science 66(5): 1935-1961.

Caruana, J (2016), “Credit, commodities and currencies", Lecture at the London School of Economics and Political Science.

Corsetti, G and E Marin (2020), “The dollar and international capital flows in the COVID-19 crisis",, 3 April.

Du, W and J Schreger (2017), “Sovereign Risk, Currency Risk, and Corporate Balance Sheets", Working Paper.

Erten, B, A Korinek and J A Ocampo (2020), “Managing capital flows to emerging markets",, 11 August.

IMF (2020), “Dampening Global Financial Shocks in Emerging Markets: Can Macroprudential Regulation Help?", in World Economic Outlook, p. 53-75, International Monetary Fund.

Rey, H (2013), “Dilemma Not Trilemma: The Global Financial Cycle and Monetary Policy Independence", Global Dimensions of Unconventional Monetary Policy, Jackson Hole Symposium on Economic Policy 2013, 284-333.

Sahay, R, V B Arora, A V Arvanitis, H Faruqee, P M N'Diaye and T M Griffoli (2014), “Emerging Market Volatility; Lessons from The Taper Tantrum", IMF Staff Discussion Notes 14/9.

Shin, H S and L Y Zhao (2013), “Firms as Surrogate Intermediaries: Evidence from Emerging Economies”, Mimeo, Princeton University.


1 See Bank of International Settlements statistics (Table C3) available here.

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