What Is a Carry Trade? How Rate Gaps Move Currencies and Stocks

시장·투자

A currency carry trade borrows in a low-rate currency and invests in a higher-yielding currency. The rate gap is only the starting point. The final return also depends on the exchange rate, funding costs, asset prices and leverage. A modest rise in the funding currency can erase a year of carry, while a crowded unwind can amplify moves across currencies and equities.

Information checked September 17, 2026 · Briefing on Money

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The answer in brief

• A carry trade seeks to earn the gap between a low funding rate and a higher return in another currency.
• The quoted rate spread is not the realized return: currency moves, asset prices and transaction costs still matter.
• If the funding currency appreciates, repaying the loan becomes more expensive in the target currency.
• When rate gaps narrow or volatility jumps, leveraged investors may unwind together, strengthening the funding currency and pressuring risk assets.

What exactly is a carry trade?

In the textbook currency carry trade, an investor borrows a low-interest-rate currency, sells it for a higher-yielding currency and invests the proceeds. The borrowed currency is the funding currency; the currency of the purchased asset is the target currency.

Yen funding is a familiar example. If yen borrowing is cheap relative to the return on dollar assets, an investor may borrow yen, buy dollars and hold a dollar deposit, bond or risk asset. The position earns positive carry only if the investment return exceeds the funding cost and adverse currency movements do not consume the difference.

Large investors can create similar exposure through FX forwards, swaps and options rather than a visible cash loan. The Bank for International Settlements (BIS) notes that this makes the total size of carry trades difficult to observe: yen borrowing and FX-derivative data include many transactions that are not speculative carry positions.

A 4-point rate gap does not guarantee a 4% return

Consider a deliberately simple one-year example. The figures are hypothetical, not current market quotes. Taxes, bid-ask spreads, fees and changes in the dollar asset’s market price are excluded.

• Borrowed amount: JPY 10,000,000
• Yen funding rate: 1% a year
• Initial USD/JPY rate: JPY 150 per dollar
• Return on the dollar investment: 5% a year
• Holding period: one year

Converting JPY 10 million at 150 produces USD 66,666.67. After earning 5%, the investment is worth USD 70,000. The yen loan has grown to JPY 10.1 million. The investor must therefore convert the USD 70,000 back into at least JPY 10.1 million to break even.

FX break-even rate

JPY 10,100,000 ÷ USD 70,000 = about JPY 144.29 per dollar. Below that rate, the yen has strengthened enough to turn the trade negative.

One-year carry outcome at different USD/JPY rates · yen terms, before costs and taxes

Ending USD/JPY	Value of USD 70,000	Profit after repaying JPY 10.1m	Return on borrowed principal
160	JPY 11.20m	+JPY 1.10m	+11.0%
150	JPY 10.50m	+JPY 0.40m	+4.0%
145	JPY 10.15m	+JPY 0.05m	+0.5%
About 144.29	About JPY 10.10m	JPY 0	0%
140	JPY 9.80m	-JPY 0.30m	-3.0%

Method: USD 70,000 × ending USD/JPY - JPY 10,100,000. Figures are rounded.

With an unchanged exchange rate, the investor keeps JPY 400,000, matching the four-percentage-point carry. Yet a decline in USD/JPY from 150 to about 144.29—roughly 3.81%—eliminates that gain. The direction matters: a lower USD/JPY quote means a stronger yen, which raises the cost of repaying the yen liability.

Why not hedge the currency risk and keep the spread?

An investor can lock in a future exchange rate with a forward or FX swap. But under normal market conditions, the forward rate reflects much of the interest-rate difference between the two currencies. This relationship is known as covered interest parity.

In plain English, the high-yield currency’s interest advantage is largely offset by the price of fully hedging it. Cross-currency basis, collateral terms, maturity and transaction costs can alter the result, but a fully hedged position should not be treated as a free, riskless way to collect the entire policy-rate gap.

The spread is an input, not the payoff

A practical return identity is: asset return - funding cost ± FX result - transaction costs. If the target asset is a stock, its price return adds another independent source of gain or loss.

How a carry unwind can amplify exchange-rate moves

Carry trades are easier to hold when rate differentials are wide and currency volatility is subdued. The setup weakens when the funding-country central bank turns more hawkish, the target-country rate outlook falls, or a risk-off shock raises volatility.

1. Investors sell assets denominated in the target currency.
2. They convert the proceeds back into the funding currency.
3. That buying pressure can make the funding currency appreciate.
4. The appreciation worsens losses on remaining carry positions, triggering margin calls or further deleveraging.
5. If positioning is crowded, the feedback loop can produce a sharp, short-lived currency move.

A May 2026 BIS study finds that large carry-trader short positions in a funding currency can amplify the exchange-rate response when that currency’s central bank tightens policy. The implication is important: the same policy surprise may have a larger FX effect when leveraged carry positions have accumulated beforehand.

Why can a currency strategy spill into stocks?

Carry-funded capital does not stop at foreign deposits or government bonds. It can reach corporate credit, emerging-market assets and equities. When investors must reduce risk or obtain the funding currency to repay liabilities, they may sell those assets at the same time.

Leverage makes the adjustment more violent. In the worked example, an ending USD/JPY rate of 140 creates a JPY 300,000 loss, or 3% of the borrowed principal. If an investor had committed only JPY 2 million of equity to support that JPY 10 million position, the same loss would equal 15% of equity before other costs. Actual margin rules vary, but the scenario shows why a modest FX move can force a large portfolio response.

BIS analysis of the August 2024 market turbulence concluded that the unwinding of leveraged positions, including carry trades, amplified short-lived bouts of equity volatility and exchange-rate moves. It did not identify carry as the sole cause: growth concerns, changing policy expectations and equity-specific positioning also mattered. A falling stock index by itself is not a reliable measure of the size of a carry unwind.

A practical dashboard for reading carry-trade risk

Six questions to ask

• Short-rate gap: What are the actual funding rate and investable yield—not just the two policy rates?
• Expected policy path: Are markets pricing a wider or narrower differential over the holding period?
• FX volatility: Is the expected currency swing larger than the carry being earned?
• Positioning and leverage: Is the trade crowded enough for one investor’s exit to pressure others?
• Destination asset: Is the money in cash, bonds, credit, equities or emerging-market assets?
• Hedging cost: Is the position unhedged, partly hedged or fully hedged?

No single statistic answers all six questions. BIS data can show yen borrowing and FX-derivative exposures, but the same instruments also serve hedging, market-making and other investment purposes. Treat any headline estimate of “the carry trade” as model-dependent rather than as a complete position count.

The right way to think about carry

Carry is best understood as compensation for accepting currency and unwind risk, not as a guaranteed interest-rate arbitrage. In calm markets it may resemble a stream of small gains. When the funding currency strengthens, however, the repayment burden rises precisely as investors may be trying to exit together.

When currencies and equities move abruptly, look beyond the headline rate gap. Ask whether the FX move has exceeded the carry, whether leverage is concentrated in the same direction and which assets investors must sell to close the trade.

Related reading

• Why Do U.S. Treasury Yields Rise? The Fed Versus the Term Premium

Sources and further reading

1. BIS, Monetary policy transmission to exchange rates: the role of currency carry trades, May 6, 2026
2. BIS, Sizing up carry trades in BIS statistics, September 2024
3. BIS, Carry off, carry on, September 2024
4. BIS Papers No 81, Currency carry trades in Latin America, April 30, 2015
5. Federal Reserve Board, Uncertainty, Currency Excess Returns, and Risk Reversals, February 2017

Sources checked: September 17, 2026

This article explains general market mechanics and is not a recommendation to trade any currency, stock or bond. Actual results depend on rates, exchange rates, asset prices, leverage, taxes and transaction costs.