|
Samuel & Co Trading
The Capital Circle
|
|
Market brief • 8 September 2026 • Five-minute read
|
|
The trade nobody sees
Japan could break the world’s favourite trade.
The yen has jumped. The Bank of Japan may raise rates. And one of global markets’ most crowded funding trades is suddenly looking expensive.
|
|
|
|
The short version
If the yen keeps strengthening, the trade built on borrowing cheap yen and buying higher-yielding assets elsewhere can start to unwind. That can raise volatility in currencies, equities and credit, even for investors who have never traded USD/JPY.
|
|
|
01 / The catalyst
What just happened?
In less than a week, the dollar fell from around ¥160 to ¥152.89, putting the yen at its strongest level since February. The move is being driven by expectations for tighter Bank of Japan policy, early signs that Japanese money could be returning home, and policymakers’ discomfort with a weak currency. [1]
Markets are pricing a 97% probability that the Bank of Japan lifts its key rate by 25 basis points to 1.25% at its 17–18 September meeting. That is pricing, not a promise. But it tells us traders are no longer treating Japan as the market that will stay cheap forever. [1]
|
|
The trade in plain English
|
|
The yen carry trade is simple at its core. Investors borrow in yen, where rates have historically been low, convert the money into another currency, and buy something offering a higher return. That may be another currency, a government bond, a corporate bond, an equity index or a higher-risk asset.
| 01 |
Borrow yen at a relatively low cost. |
| 02 |
Convert and invest in a higher-yielding currency or asset. |
| 03 |
Collect the gap between the return earned and the interest paid. |
| 04 |
Hope the yen does not rise too much before the loan is repaid. |
|
|
|
02 / The maths
A simple illustration, not a trade idea.
Imagine a fund borrows the equivalent of £400 in yen at a 1% annual cost and buys an asset yielding 5%.
| ITEM |
ILLUSTRATIVE RESULT |
| Return on the £400 asset at 5% |
+£20 |
| Interest cost on yen borrowing at 1% |
−£4 |
| Carry before currency moves |
+£16 |
| Cost if the yen rises 4.5% against the funding currency |
−£18 |
| Result before fees, hedging and any asset-price move |
−£2 |
Sophisticated investors may hedge currency risk, use different assets and manage leverage differently. The lesson is that a small interest-rate advantage can be overwhelmed by a fast currency move, especially when leverage is involved.
|
|
The important bit
When the yen strengthens, investors who borrowed yen need more of their own currency to repay the same yen debt. That is why a rising yen can turn an apparently sensible yield trade into a rush for the exit.
|
|
|
03 / Why it matters
Why this is suddenly a global story.
The true size of yen-carry exposure is impossible to measure precisely. But a Jefferies analysis of Bank for International Settlements data put cross-border yen borrowing, a proxy for carry-trade activity, at a record ¥360 trillion, or $2.35 trillion, as at March. [1]
| 01 |
Currencies can move first, and fastest.
Reducing a carry trade means buying yen and selling the currencies or assets bought with that funding. The yen has gained almost 5% in September against the Mexican peso and Turkish lira, two currencies often associated with carry strategies. [1]
|
| 02 |
Equities can feel it, even if nothing changes at the company.
A carry unwind does not need bad earnings or a recession to affect equities. If investors reduce leverage, they may sell what is easiest to sell: liquid indices, technology shares, emerging-market stocks or exchange-traded funds. That can tighten risk appetite without guaranteeing a broad sell-off.
|
| 03 |
Bonds may change the case for keeping money overseas.
Japan’s 10-year government-bond yield is hovering near its highest level in 30 years. It does not guarantee a wave of capital repatriation, but it makes the old assumption that money must leave Japan to earn a meaningful return less comfortable. [1]
|
|
|
04 / The central bank
Why the Bank of Japan has the market’s attention.
The Bank of Japan is walking a narrow path. It needs to weigh inflation risks, the impact of a weak yen on imported prices and the possibility that higher borrowing costs slow the domestic economy.
Governor Kazuo Ueda said the Bank would discuss whether to raise rates, including in September, with attention on inflation risks. An adviser to Prime Minister Sanae Takaichi has also said he expects a September move and a further rise by January. [2]
|
|
Three paths after the meeting
|
| The BOJ hikes and signals more tightening |
The yen could retain or extend recent gains if investors conclude the funding side of the carry trade has genuinely repriced. |
| The BOJ hikes but sounds cautious |
A “buy the rumour, sell the fact” reaction is possible if investors decide the market had already priced too much. |
| The BOJ holds or is softer than expected |
The yen could weaken as traders rebuild positions, though intervention and future policy risk remain in the background. |
These are scenarios, not forecasts. The decision matters, but the Bank’s message may matter more.
|
|
05 / The global link
It is not just Japan.
The yen is rallying at the same time that the US rate outlook remains unsettled. August non-farm payrolls increased by 162,000, while unemployment held at 4.1%. That was stronger than the prior 12-month average gain of 31,000, leaving markets focused on US inflation data and the Federal Reserve’s next decision. [3]
Carry trades are built on rate differentials. If Japan tightens while other central banks signal a slower path, the gap narrows. Even if US rates stay firm, a fast yen move can dominate the interest-rate maths in the short term.
|
|
My take
The story is not “Japan causes a crash”. It is that one of global markets’ cheapest sources of leverage is becoming less reliably cheap. When the price of funding changes, prices elsewhere often have to adjust too.
|
|
|
06 / The checklist
What I’m watching next.
| USD/JPY |
The quickest scoreboard for whether the yen rally is holding or fading. |
| Japanese bond yields |
Higher domestic yields can alter the case for keeping capital abroad. |
| Volatility and equity breadth |
Rising volatility or narrowing market leadership would signal more cautious risk-taking. |
| MXN/JPY and TRY/JPY |
Useful windows into whether established carry positions are being reduced. |
| US CPI and Fed expectations |
The other side of the rate-differential equation remains crucial. |
The key date is 18 September, when the Bank of Japan concludes its meeting. The real test may come afterwards: does the yen hold its gains once the event risk has passed? If it does, the market may be looking at more than a short squeeze. It may be repricing the world’s favourite funding currency.
|
|
Subscriber access
Potentially access £499 of trading tools at no cost.
If you would like to build a more structured market routine, eligible subscribers may be able to access the TradeMate and Cluster 2.0 tools through our IG eligibility route.
|
TradeMate · £349 RRP
An educational technical-analysis indicator that analyses momentum and price action to flag potential pullback patterns when your chosen technical conditions are met.
|
Cluster 2.0 · £150 RRP
A market-strength and trend tool that uses filters to surface potential turning points and divergence, with visual, sound, popup and mobile alerts.
|
The combined public retail value is £499. If you are eligible, you may be able to receive access to both tools at no cost.
Access is subject to eligibility and applicable terms. Both tools are educational and do not guarantee profitable trades or predict market movements with certainty. Trading, spread betting and CFDs carry risk and may not be suitable for everyone.
|
|
|
|
