What Is a Carry Trade? Earning the Interest Rate Difference

A carry trade involves buying a currency with a higher interest rate while selling one with a lower interest rate, aiming to profit from both the interest rate difference and potential price appreciation.

How the interest income works

Holding a long position in the higher-yielding currency typically earns a positive swap (rollover), paid because you’re effectively “borrowing” the lower-yielding currency to fund the position. Held over time, this can add up to a meaningful return separate from price movement.

Why carry trades were historically popular

When interest rate differences between countries are large and relatively stable, carry trades can generate steady returns during calm market periods, which made certain currency pairs popular for this strategy during specific interest rate cycles.

The key risk

Carry trades can unwind very quickly during periods of market stress, when investors rush to close risky positions all at once — this can cause sharp, fast losses in the underlying currency pair that overwhelm months of accumulated interest income in a matter of days.

Key takeaway

A carry trade combines a steady, income-like return with real currency risk — it isn’t a low-risk strategy just because the interest income feels passive, and it can reverse suddenly when broader market sentiment shifts.