SUNANDO ROY – On Banking, Finance and Society

The foreign exchange (FX) swap market plays a pivotal role in the global financial system, acting as a critical bridge between the government bond and foreign exchange markets. With an outstanding volume of $113 trillion, as highlighted in Hyun Song Shin’s lecture at the London School of Economics on May 19, 2025, FX swaps are a cornerstone of international finance. https://www.lse.ac.uk/Events/Open/202505191800/Global-Financial-System

This blog explores the mechanics of FX swaps, their exponential growth, and their influence on both bond and forex markets.

Primer

An FX swap comprises two simultaneous transactions: a spot exchange of currencies and a forward contract to reverse the exchange at a predetermined rate on a future date. For instance, a euro area investor might exchange euros for U.S. dollars at the current spot rate to purchase U.S. Treasury bonds, while committing to repurchase euros at an agreed forward rate. This structure effectively allows borrowing one currency by pledging another without recording the transaction as a liability on the balance sheet. Instead, the repayment obligation is noted off-balance-sheet, preserving the investor’s financial profile.

This mechanism enables investors to manage currency risk efficiently, facilitating cross-border investments while maintaining minimal accounting visibility. FX swaps are thus a vital tool for institutions seeking to navigate global markets without exposing themselves to exchange rate volatility.

Growth and Structural Shifts

Since the Global Financial Crisis (GFC) of 2008, the FX swap market has experienced exponential growth, driven by structural changes in the financial system. Shin highlights that the “other financial institutions” segment, including hedge funds and asset managers, has tripled in size since 2009, with U.S. dollar-denominated swaps dominating due to the dollar’s reserve currency status. Post-GFC regulatory reforms curtailed the leverage of traditional banks and broker-dealers, shifting market-based intermediation to non-bank entities. FX swaps have become a preferred instrument for these institutions to access foreign currencies for investments in government bonds, particularly U.S. Treasuries.

This shift reflects a broader reorientation of financial activity from private sector claims, such as mortgages, to sovereign debt. The increased reliance on FX swaps has amplified their role in channeling capital across borders, underscoring their systemic importance.

Accounting Treatment and Reduced Visibility

The accounting treatment of FX swaps significantly diminishes their apparent impact on financial statements, a factor that enhances their appeal and complicates regulatory oversight. Unlike traditional loans, which increase liabilities and signal higher leverage, FX swaps are recorded as currency exchanges with future commitments. The process can be summarized as follows:

• Initial Position: An investor’s balance sheet reflects holdings in their domestic currency (e.g., euros in a deposit).
• Post-Swap Position: After exchanging euros for dollars via an FX swap, the balance sheet shows dollar-denominated assets (e.g., cash or deposits). The obligation to repay dollars at maturity is recorded off-balance sheet, not as a liability.
• Post-Investment Position: Upon purchasing U.S. bonds with the dollars, the balance sheet reflects the bonds as assets, while the off-balance-sheet dollar obligation persists, maintaining a low leverage profile.

This off-balance-sheet treatment minimizes the perceived financial footprint of FX swaps. By avoiding the classification of swaps as debt, investors and institutions can engage in substantial currency transactions without inflating reported liabilities, thereby reducing scrutiny from regulators and markets. This accounting practice has enabled the FX swap market to grow to $113 trillion while maintaining a relatively discreet presence in financial reporting.

Interconnection of Bond and Forex Markets

FX swaps play a pivotal role in linking government bond and foreign exchange markets through portfolio flows, currency hedging, and financial conditions. The following table delineates their functions and impacts:

1. Facilitating Cross-Border Bond Investment: FX swaps allow investors to acquire foreign currencies to purchase government bonds while hedging currency risk. Shin’s forthcoming research with Nenova and Schrimpf demonstrates that this mechanism has driven significant portfolio inflows into U.S. long-term debt securities, lowering yields and easing financial conditions, as measured by the Goldman Sachs Financial Conditions Index. Reduced yields translate into lower borrowing costs, impacting sectors from housing to corporate finance.
2. Influencing Exchange Rates: The use of FX swaps to borrow major currencies like the U.S. dollar or Japanese yen increases their supply in spot forex markets, contributing to depreciation. Shin’s analysis reveals a negative correlation between FX swap growth and the appreciation of these currencies’ broad nominal effective exchange rates. For instance, borrowing yen to invest in high-yield emerging market bonds can weaken the yen, affecting global currency dynamics.
3. Perpetuating a Feedback Loop: Shin describes a “triangle” comprising FX swaps, portfolio flows, and financial conditions. Increased swap activity fuels bond purchases, which lower yields and loosen financial conditions. These conditions, in turn, incentivize further swap usage, creating a self-reinforcing cycle. This dynamic is evident in bilateral portfolio flows from regions such as the euro area, Japan, and the United Kingdom into U.S. debt markets, highlighting the global interconnectedness facilitated by FX swaps.

Implications for Financial Stability

The scale and opacity of the FX swap market pose significant challenges for financial stability. The short-term nature of most swaps’ contrasts with the long-term maturity of bonds purchased, creating potential liquidity risks during market stress. The off-balance-sheet accounting further obscures the true extent of leverage, complicating efforts to monitor systemic risk. As Shin emphasizes, the post-GFC focus on regulated entities’ balance sheets is insufficient; the rise of non-bank institutions necessitates updated supervisory frameworks to capture the full scope of FX swap activity.

For policymakers, this underscores the need for enhanced monitoring tools to address the evolving structure of global finance. For markets, the influence of FX swaps on yields, exchange rates, and financial conditions affects a wide range of economic outcomes, from borrowing costs to the price of imported goods.

The FX swap market is a vital conduit between government bond and foreign exchange markets, enabling cross-border investment, shaping currency values, and influencing financial conditions. Its accounting treatment, which relegates obligations to off-balance-sheet status, allows institutions to manage substantial currency exposures with minimal visible impact, contributing to the market’s $113 trillion scale. However, this discretion introduces risks that require vigilant oversight. As global finance continues to evolve, understanding the mechanics, growth, and systemic implications of FX swaps is essential for academics, policymakers, and financial professionals navigating the complexities of international markets.

Shin Lecture : https://youtu.be/UKa0arM8ZlM