Few concepts in forex trading are as important — or as frequently misunderstood — as the carry trade, and no currency pair is more central to it than USD/JPY. Understanding how the carry trade works, and why the Japanese yen sits at the heart of it, gives you insight into one of the most powerful forces shaping global currency flows. It also explains some of the most dramatic market moves of recent years. Here’s a clear breakdown of how it all fits together.
What Is a Carry Trade?
A carry trade is a strategy built on the difference in interest rates between two currencies. The principle is straightforward: you borrow in a currency with a low interest rate and use those funds to buy a currency with a higher interest rate, aiming to pocket the difference — known as the “carry.”
When you hold a position in a currency pair overnight, you either pay or receive interest depending on the interest rate differential between the two currencies involved. A carry trader deliberately positions to be on the receiving side of that equation, earning a yield simply for holding the position. If the higher-yielding currency also appreciates against the lower-yielding one, the trader profits twice — from the interest differential and from the favourable price movement.
Among the currency pairs available to traders, those combining a high-yielding currency with a low-yielding one are the natural vehicles for this strategy. And for decades, one currency has been the funding currency of choice.
Why the Japanese Yen?
The Japanese yen has long been the world’s premier funding currency for carry trades, and the reason is simple: Japan has maintained ultra-low interest rates for an extraordinarily long time. For years, the Bank of Japan held rates near zero — and at times below zero — as it battled persistent deflation and sluggish economic growth.
This made the yen extraordinarily cheap to borrow. Investors and institutions worldwide would borrow in yen at minimal cost and deploy that capital into higher-yielding assets elsewhere — including higher-yielding currencies like the US dollar, but also stocks, bonds and other assets around the globe. This made the yen the funding backbone of a truly massive global carry trade, with implications reaching far beyond the forex market.
When you pair the low-yielding yen with the higher-yielding US dollar, you get the USD/JPY forex pair — the classic carry trade expression. Buying USD/JPY means going long the higher-yielding dollar and short the lower-yielding yen, positioning to earn the interest rate differential between the two.
How the USD/JPY Carry Trade Works in Practice
Let’s walk through the mechanics. Suppose US interest rates sit at 4% while Japanese rates sit near 0.5%. The differential is roughly 3.5% in the dollar’s favour. A trader who buys USD/JPY and holds the position is effectively long that interest rate differential, earning the carry for as long as the position remains open and the differential persists.
In a stable market with healthy risk appetite, this can be a genuinely attractive strategy. The trader earns a steady yield from the rate differential, and if the dollar strengthens against the yen — which often happens when US rates are high and rising — they benefit from capital appreciation on top. This combination is why USD/JPY has historically trended strongly in periods of wide US-Japan rate differentials, as carry flows reinforce the directional move.
The position also benefits from a self-reinforcing dynamic. As more traders pile into the carry trade, their collective buying of USD/JPY pushes the pair higher, which attracts still more participants, further extending the move. During favourable conditions, this can produce sustained, powerful uptrends in the pair.
The Risk: When Carry Trades Unwind
Here’s where the carry trade reveals its dangerous side. For all its appeal in calm markets, the carry trade carries a significant and often underestimated risk: violent unwinding during periods of market stress.
When risk sentiment sours — during a financial crisis, a geopolitical shock or a sudden shift in central bank policy — investors rush to reduce risk and repay their borrowed positions. In the case of yen-funded carry trades, this means buying back the yen they borrowed, which causes the yen to strengthen sharply and USD/JPY to fall rapidly. Because so many participants are positioned the same way, these unwinds can be extraordinarily fast and severe, cascading as each wave of selling triggers further selling.
A vivid recent example occurred in August 2024, when a surprise Bank of Japan rate hike triggered a rapid unwinding of yen carry trades. The yen strengthened dramatically, USD/JPY fell hard and the shock rippled across global markets, hitting equities and other risk assets in the process. The lesson was stark: carry trades can accumulate gains slowly and steadily over months, then surrender them in a matter of days when conditions turn.
What Moves the USD/JPY Carry Trade
Several factors determine the attractiveness and stability of the USD/JPY carry trade at any given time.
The interest rate differential is the foundation. As long as US rates remain meaningfully above Japanese rates, the carry incentive exists. Any narrowing of that gap — whether through the Fed cutting rates or the Bank of Japan hiking — reduces the appeal and can trigger unwinding.
Risk sentiment is the other critical factor. Carry trades thrive when markets are calm and confident, and they suffer when fear takes hold. This is why the yen is often described as a “safe haven” currency — it tends to strengthen during times of market stress precisely because of unwinding, as borrowed yen positions are repaid en masse.
Central bank policy on both sides drives the whole dynamic. Traders watching USD/JPY need to follow both the Federal Reserve and the Bank of Japan closely, as shifts from either can dramatically alter the calculus.
Trading USD/JPY with Awareness
For traders interested in USD/JPY, understanding the carry trade dynamic is essential context. The pair doesn’t just move on the usual technical and fundamental factors — it’s also shaped by the vast web of carry positioning built up around it. This is what can make USD/JPY trend steadily for extended periods and then reverse with startling speed.
To trade the pair effectively, you’ll need to use a trading platform that gives you solid charting, reliable execution and the ability to monitor the macro factors driving the pair. Keeping across central bank policy on both sides, tracking the interest rate differential and staying alert to shifts in broader risk sentiment are all part of trading USD/JPY with genuine awareness rather than treating it as just another pair.
Whether you’re drawn to the steady carry in calm markets or looking to trade the sharp moves when conditions shift, USD/JPY offers a rich and dynamic market. To explore trading it alongside the tools and account options that support this kind of macro-driven trading, you can find out more at www.fxpro.com and build your approach on a proper understanding of what makes this pair move the way it does.
