What it means
The classic version is a currency carry trade. An investor borrows in a low-yielding currency, converts the proceeds, invests at a higher rate elsewhere, and pockets the interest differential for as long as the exchange rate behaves.
The exposure is entirely in the currency, not the interest. If the funding currency strengthens against the investment currency, repaying the loan costs more than was borrowed, and that loss can swamp several years of accumulated interest differential in a matter of weeks.
Similar mechanics appear well beyond foreign exchange. Borrowing short-term and lending long-term inside a single currency is a carry trade on the yield curve, and buying high-yield bonds funded by low-yield ones is a carry trade on credit risk.
Ordinary businesses run these positions without calling them carry trades. A company that borrows in a cheap foreign currency because the headline rate looks attractive, while earning revenue at home, has taken exactly the same exposure a hedge fund would recognise instantly.
The nuance is the unwind. Carry trades are usually crowded, so when sentiment turns everyone tries to exit at once, which strengthens the funding currency sharply and turns a modest loss into a severe one.
In practice
Real-world examples.
Example
A hedge fund borrows in a low-rate economy and buys short-dated government bonds in a high-rate emerging market. It earns a comfortable differential for two years, then gives back most of it in a single month when a political shock sends investors back to safer currencies.
Example
A mid-sized exporter takes a foreign currency loan because the interest rate is three points lower than its domestic option. Its revenue is entirely domestic, so when the borrowing currency strengthens the repayment cost rises and the interest saving is wiped out.
Example
A bank runs a maturity transformation book, funding five-year lending with overnight deposits to capture the slope of the yield curve. When short rates rise faster than expected, the funding cost climbs while the loan income stays fixed, and the positive carry turns negative.
Think of it
“Carry trade borrows cheap to invest in high yield-profiting from rate differentials.
Formula
Calculation
Net return = interest differential earned - currency movement against the position, calculated on the amount borrowed.
Worked example. A fund borrows the equivalent of $5,000,000 in a currency where funding costs 1.0% a year, converts it, and invests at 6.5% a year.
Interest differential = 6.5% - 1.0% = 5.5%.
Interest gain over one year = 5.5% x $5,000,000 = $275,000.
Now suppose the funding currency appreciates by 4% over that year, making the loan more expensive to repay.
Currency loss = 4% x $5,000,000 = $200,000.
Net result = $275,000 - $200,000 = $75,000, a return of 1.5% on the amount borrowed rather than the 5.5% the interest differential seemed to promise. Had the funding currency appreciated by 8% instead, the loss would be $400,000 and the trade would end $125,000 down.Case study
Seen in the real world.
This case study is illustrative and the company is fictional. Kestrel Marine Supplies, an invented equipment distributor, was offered a foreign currency facility at 1.0% when its domestic bank quoted 6.5%. The finance team drew $5,000,000 equivalent and treated the roughly $275,000 annual interest saving as a straightforward win.
For two years it worked. In the third year the funding currency appreciated by 4% over twelve months, adding about $200,000 to the repayment cost and cutting the year's benefit to $75,000. A further move the following year turned the arrangement into a net loss and forced an awkward conversation with the audit committee.
Kestrel refinanced domestically and adopted a simple rule: borrow in the currency you earn in unless the exposure is hedged and the hedge cost is included in the comparison. The illustrative lesson is that an interest rate saving and a currency bet are two different transactions bundled into one loan agreement.
Watch out
Common mistakes.
- Quoting the interest differential as the expected return, when the currency movement usually dominates the outcome.
- Comparing a foreign currency loan with a domestic one on headline rate alone, without pricing the hedge needed to make them comparable.
- Assuming a strategy that has worked for several quiet years is low risk, when carry trades are specifically characterised by long calm periods and short violent ones.
Questions
People also ask.
Can a carry trade be hedged?
Yes, but forward pricing tends to remove most of the interest differential, which is the market's way of saying the extra yield was compensation for currency risk.
Is a carry trade the same as leverage?
Not quite, though the two usually travel together: the trade is about the yield gap, while leverage determines how large the resulting gain or loss becomes.
Do ordinary companies run carry trades?
Frequently and often unintentionally, whenever they borrow in one currency and earn revenue in another because the foreign rate looked cheaper.
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