Carry Trade Pairs

A carry-trade pair is a currency pair chosen specifically to profit from interest-rate differentials. An investor borrows funds in a low-interest-rate currency (e.g., Japanese yen) and converts them to a high-interest-rate currency (e.g., Australian dollar or Turkish lira), then invests the proceeds in bonds or deposits. The profit is the interest-rate spread, minus any currency depreciation.

The mechanics: interest-rate arbitrage with currency exposure

A trader borrows 100 million JPY at 0.5% per annum (Japanese rates, historically very low). She converts to AUD at the current spot rate, say 1 JPY = 0.012 AUD, receiving 1.2 million AUD. She invests in Australian government bonds yielding 4.0% per annum. Annual interest received: 1.2M × 0.04 = 48,000 AUD. Annual interest paid on the JPY loan: 100M × 0.005 = 500,000 JPY ≈ 6,000 AUD (at the same exchange rate).

Net profit: 48,000 – 6,000 = 42,000 AUD per year, or 3.5% on the 1.2 million AUD invested. This is the interest-rate differential (4.0% – 0.5% = 3.5%), minus any bid-ask spreads and financing costs.

But there is currency risk. If the AUD depreciates 5% against the JPY over the year, the 1.2 million AUD investment is worth 1.14 million AUD (5% less). The trader converts back to JPY at a loss of 60,000 AUD, wiping out the 3.5% interest gain and then some. Carry-trade profitability depends on the currency not depreciating significantly.

Classical carry-trade pairs (historical and current)

JPY/AUD carry: The archetypal carry trade. Japanese rates have been near zero for two decades; Australian rates average 2–4%. Massive capital has been deployed in this pair, particularly by Japanese retail investors using leverage (up to 25:1 in Japan). This creates crowded positioning; when risk-off sentiment hits, simultaneous unwinding can cause violent AUD depreciation.

JPY/NZD: Similar to JPY/AUD but with New Zealand’s smaller economy. NZD interest rates are typically 50–100 basis points lower than AUD, so the carry is less attractive.

CHF/TRY, CHF/MXN, CHF/BRL: Swiss rates are low; Turkish, Mexican, and Brazilian rates are higher (especially Turkey, which has used high rates to combat inflation). These pairs have attractive interest differentials but carry significant political and economic risk (currency crises, policy reversals).

EUR/HUF, EUR/PLN: Hungarian and Polish interest rates are higher than eurozone rates. Eastern European currencies offer 150–300 basis point spreads, but liquidity is lower and political risk is meaningful.

Profitability and the relationship to interest-rate parity

In a frictionless world, interest-rate parity would eliminate carry opportunities. If the interest-rate differential is 3.5% (AUD – JPY), then covered interest-rate parity predicts that the forward AUD/JPY exchange rate should be 3.5% lower (AUD is expected to depreciate 3.5% over the year to offset the interest gain). In that case, a trader locking in the forward rate would earn zero.

In practice, forward rates do not fully price the interest-rate differential, especially in the short term. Market frictions (bid-ask spreads, leverage costs, regulatory capital charges) prevent the differential from being arbitraged away. Carry trades persist because the expected depreciation is less than the interest differential—at least in calm markets.

During risk-on periods (low volatility, capital flowing into emerging markets), carry trades are profitable. During risk-off periods (sharp selloffs, flight to safety), the unwinding is violent. Traders holding leveraged carry positions are forced to sell, causing the funded currency (AUD) to collapse relative to the funding currency (JPY). A 10% AUD depreciation wipes out a 3.5% annual carry in one day.

Crowded trades and flash crashes

The carry trade is a classic crowded trade. Estimates suggest $1–2 trillion in net carry-trade positioning. When risk-off sentiment hits, the unwinding is synchronized and violent. The August 2024 market volatility saw rapid JPY appreciation (carry unwinding) and concurrent losses in growth assets. Traders who were leveraged long carry suffered compounding losses.

The flashcrash potential is real. In March 2020, the COVID-19 shock triggered simultaneous carry-trade unwinding, margin calls, and forced selling. Central bank intervention (including currency-swap lines) was necessary to stabilize markets.

This is why institutional investors treat carry as a risk-management problem, not just a return generator. A hedge fund with a 3.5% carry-trade position is also exposed to the risk of a 10–20% crash if risk-off sentiment emerges. Hedging via FX options or volatility positions is common.

Role of leverage and funding costs

Retail carry traders in Japan often use 25:1 leverage to amplify the carry. A 3.5% interest differential becomes a 87.5% gross return on leveraged capital (before transaction costs and funding spreads). However, a 4% AUD depreciation becomes a 100% loss (wiping out capital). The 2024 unwind demonstrated the fragility of leveraged carry.

Professional hedge funds use lower leverage (3–5x) and more sophisticated hedging, but they still face mark-to-market losses during stress periods. Funding costs also matter: if the trader borrows JPY at 0.75% instead of 0.5%, the carry drops from 3.5% to 3.25%, reducing profitability and the cushion against depreciation.

Alternative carry pairs and emerging markets

Emerging-market currencies (BRL, MXN, ZAR, INR) often offer attractive 4–7% interest-rate differentials against JPY or CHF. However, these pairs carry higher political and sovereign default risk. A Turkish lira carry trade with a 10% nominal differential can reverse violently if a currency crisis hits.

The Brazilian real is a popular carry trade currency. Brazilian interest rates have ranged from 6–13%, and the currency is relatively liquid. However, political instability and commodity price sensitivity create drawdown risks. Similarly, the Mexican peso offers decent carry but faces U.S. interest-rate risk and trade-policy uncertainty.

Interaction with monetary policy

Carry-trade profitability is sensitive to central-bank interest-rate expectations. If the Bank of Japan is expected to raise rates (ending the zero-rate era), the funding currency (JPY) will strengthen—triggering carry unwinds. Conversely, if the RBA is expected to cut rates, the investment currency (AUD) will weaken, also unwinding the trade. Fed policy shifts, which affect global risk appetite, are another major driver.