Carry Trade: How Rate Differentials Become a Strategy
Macro Glossary, Sentiment and Regime
By Ken Chigbo, macro trader and founder of KenMacro, 18+ years in markets.
Updated 2026-05-20
The desk’s answer
A carry trade borrows in a low-yielding currency and invests in a higher-yielding one, earning the interest rate differential as steady positive return. The classic forex carry is selling JPY (low yield) to buy AUD, MXN, BRL or NZD (high yield). Returns come from two sources: the carry (interest differential earned daily, paid as positive swap rollover) and any favourable spot move. The strategy is profitable in calm or trending regimes but is one of the most violently punished in risk-off, when the funding currency rallies sharply against the high-yield target in a ‘carry unwind’.
Defined term, Carry trade
A carry trade is a strategy that borrows in a low-yielding currency and invests in a higher-yielding currency, earning the interest rate differential as a steady positive return. The classic forex implementation is selling JPY (low yield) to buy AUD or MXN (high yield). The strategy is profitable in calm or trending regimes but is one of the most punished strategies in risk-off when the funding currency rallies sharply against the high-yield target.
How a carry trade works
A trader sells JPY (borrows at the BoJ’s policy rate, currently 0.50 percent) and buys MXN (the Mexican peso, earning the Banxico policy rate, currently around 10 percent). The 9.5-percentage-point rate differential is earned daily through swap rollover, paid as a positive credit on the position. On a 10,000 dollar account with 10:1 leverage, the carry on a 100,000-MXN position is roughly 9,500 dollars per year in interest, or about 26 dollars per day, ignoring spot moves. If the spot rate also moves in the trader’s favour (MXN strengthening against JPY), total return is the spot move plus the carry; if spot moves against, the spot loss can quickly exceed the carry earned.
Why carry trades unwind violently
Carry trades are crowded by construction. The high-yield currency strengthens steadily as more capital flows in to chase the differential, which reinforces the trade. In calm regimes this is a self-reinforcing positive return. In risk-off, the dynamic reverses: capital flees the high-yield currency (perceived as risky in stress) and bids the low-yield funding currency (often a safe haven like JPY or CHF). The forced unwinding is fast and violent: the August 2024 yen carry unwind saw USD/JPY drop 12 percent in three weeks as global hedge funds covered short-yen positions. Carry trade returns are therefore positively skewed in calm and negatively skewed in stress: small steady gains, occasional large losses.
Trading carry responsibly
Three rules. First, size carry positions for the unwind, not for the calm: a 1-percent risk per trade with a stop set well outside normal range, recognising that a carry unwind can produce 8 to 15 percent moves in days. Second, monitor positioning data (CFTC COT, broker positioning) for crowded-trade warnings; carry unwinds happen most reliably from extreme one-sided positioning. Third, treat the rate differential as the slow return and the spot move as the dominant risk; the carry pays for the position to be wrong for a few days, not for it to be wrong by a large margin. Traders who size carry trades on the basis of the carry alone, ignoring the spot risk, are the ones who get carried out in the unwind.
Frequently asked
What is a carry trade?
A strategy that borrows in a low-yielding currency and invests in a higher-yielding currency, earning the interest rate differential as steady positive return. The classic forex carry is selling JPY (low yield) to buy AUD, MXN, BRL or NZD (high yield), earning the differential through positive swap rollover.
Why are carry trades risky?
Because they are crowded by construction and unwind violently in risk-off. The funding currency (JPY, CHF) rallies sharply as capital flees the high-yield target, producing 8 to 15 percent moves in days. Carry returns are positively skewed in calm and negatively skewed in stress: small steady gains, occasional large losses.
What was the 2024 yen carry unwind?
In August 2024, USD/JPY dropped roughly 12 percent in three weeks as global hedge funds covered short-yen positions that had funded carry trades into the dollar and high-yield emerging-market currencies. The unwind was triggered by a small BoJ rate hike combined with weak US jobs data, which forced rapid position cover.
What this means at the desk
Size carry for the unwind, not for the carry. The differential pays for being wrong for days, not for being wrong by a lot.
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