A carry trade means borrowing money in a currency with low rates and using it to hold a currency with higher rates. The return comes from the gap between those rates, so the idea is simple to state. The risk is that exchange rates can move far more than the gap pays, and that movement is where most losses come from. Understanding both sides comes first, before you compare any forex provider.
What the trade does
Picture a currency with low borrowing rates and another that pays higher rates on money held in it. An investor borrows the low-rate currency, exchanges it for the higher-rate one, and holds that position open while the setup still makes sense. The position earns the rate on the higher-rate side and pays the rate on the borrowed side.
The net result is called the carry, which is where the strategy takes its name. Keep in mind that the carry is only part of the outcome. The exchange rate between the borrowed currency and the held currency decides the rest.
Where the return comes from
The gap between the borrowing rate and the holding rate is called the rate differential. A wider differential means more return on the same amount, all else equal. Little is left to earn when the differential is small. A negative differential means the holding earns less than the borrowing rate, so the trade loses ground before any exchange move.
Imagine a holder who borrows at a very low rate and holds a currency paying a much higher rate. If the exchange rate stays flat for a long stretch, the gap is what the holder keeps. Exchange rates rarely stay flat for long, so the gap alone does not tell the full story.
The exchange rate risk
The return is earned in the higher-rate currency, but the loan sits in the lower-rate one. If the higher-rate currency falls against the lower-rate one, the loss on the exchange can be larger than the rate gap earned. Currency moves are often sharper than the gap, which is why the strategy is sometimes compared to collecting small coins in front of a steamroller.
Consider a holder who collects a steady gap for several months, then sees the held currency drop sharply in a single week. The lost ground on the exchange can wipe out those months of gains. This is the core risk, and it is why the trade is never just a matter of picking the higher rate.
Rollover and swap adjustments
A position held overnight often triggers an adjustment, usually called a rollover or a swap. Providers typically calculate it from the rate gap between the currencies in the pair, so it can be a small credit or a small debit each day. Direction matters, since the same pair can credit the holder in a given setup and debit them in the reverse setup.
Over weeks, these small daily amounts add up, and they can shrink or reverse the gain from the rate gap. Exact timing, calculation and size differ between providers and between product types. Check the provider's written explanation before opening any position that stays open overnight.
Limits and common mistakes
The trade is easy to explain and hard to hold through bad weeks. Several mistakes come up again and again.
- Treating the rate gap as a steady return. Rates can change, and the holding can lose ground quickly.
- Ignoring the exchange rate. Currency moves can outweigh the gap for long periods.
- Using borrowed exposure to increase the size. Borrowed exposure magnifies losses as well as gains, and a sharp move can force a close at a loss.
- Forgetting the daily adjustments. They build up over time and can reverse the result.
- Assuming the same setup works everywhere. Rules, product types and protections vary by country and provider.
Many investors look at maximum drawdown, the largest fall from a peak, to see how deep a loss could go. Measuring that depth before committing money keeps the downside in view.
Checks before trying a carry trade
Start with the provider's written explanation of how the daily adjustment is calculated for the pair you have in mind. Next, confirm whether client money is held apart from company money and what happens to a negative balance. Then check who oversees the provider where you live and what protection, if any, covers your money if the provider fails.
For a broader view of currency investing, read the forex guide. When you are ready to compare providers, the guide on how to choose a forex provider sets out what to look for. Take your time, and keep exchange rate risk at the front of every decision.