There's a trade that has run quietly in the background for decades, helping to drive the world's biggest markets while most investors never notice it: the yen carry trade. A few days ago, on 16 June 2026, the Bank of Japan raised its policy rate to around one percent — the highest since 1995. A good moment to explain this trade soberly: what it is, how it developed, where it stands now, and what it means for stocks and Bitcoin.

Market and rate data as of 16 June 2026. Prices, yields and exchange rates move daily and may have changed since.

What the yen carry trade is

At its core, the carry trade is a bet on an interest-rate difference. You borrow where rates are low — in Japan — and invest where the return is higher: in US government bonds, in equities, in crypto. The profit is the gap. As long as the yen stays weak and Japanese rates stay low, a steady stream of income flows in.

An example makes it concrete. A fund borrows the equivalent of 100 million dollars in yen at a low rate, converts it to dollars, and buys US securities. Its profit hinges on three things: the borrowing cost, the price move of the security, and above all the exchange rate.

The exchange rate is the Achilles heel. If the yen suddenly strengthens, repaying the borrowed money gets more expensive — and can wipe out the entire interest advantage in one stroke. Because many of these positions also run on borrowed money, with leverage, they don't unwind calmly under stress; they unwind in cascades. That's what makes the carry trade treacherous.

Nobody knows exactly how big it is. The Bank for International Settlements put the figure ahead of the August 2024 blow-up at roughly 40 trillion yen, about 250 billion dollars — and considered that an undercount because of data gaps. Other estimates cited by Bloomberg run as high as 300 to 500 billion dollars. The range alone tells you something: this is a lot of money whose true size sits hidden.

How it developed — and the shock of August 2024

For decades, Japan's zero-rate policy supplied practically free money. The carry trade became the silent fuel of many global rallies. A meaningful share of the capital that flowed into US technology stocks and emerging markets in recent years originated as cheap yen loans. That's why a strengthening yen and falling equities so often move together.

How fast it can flip was on display in August 2024. The trigger was a surprise Bank of Japan hike at the end of July to 0.25 percent. The yen strengthened quickly, and leveraged positions had to be unwound at speed.

Crypto was dragged along too. According to the Bank for International Settlements, Bitcoin and Ethereum lost up to 20 percent in those days — a sign that many retail traders faced margin calls and had to sell even positions that had nothing to do with Japan. The exact Bitcoin figures vary by source and window; one widely cited path is a drop from around 64,000 to 49,000 dollars within 48 hours. Stated honestly, the range sits roughly between 15 and 25 percent, depending on the window you measure.

The shrinking yield gap — and why that's only half the story

A particular chart is doing the rounds right now: the gap between US and Japanese 30-year government bond yields. The observation itself is correct.

Japan's long-term yields have climbed from around 0.7 percent in 2021 to roughly 3.8 percent, while US yields sit near five percent. The gap has shrunk from about three and a half points to around one and a half.

From this people often jump to the conclusion that the carry trade is dying. This is where a closer look pays off, because the chart tells only half the story. It shows long-term yields — and those are not the funding cost of the carry trade. The trade is funded at the short end, at the central bank's policy rate. And that, despite the recent hike, sits at just one percent, while the US central bank is well above it.

Long-term yields tell a different but equally important story: repatriation. When a Japanese insurer can again earn nearly four percent at home on a long-dated government bond — with no currency risk at all — instead of five percent on a US one with currency risk, it brings its money home. That puts slow but steady upward pressure on the yen.

So you have to keep two forces apart. At the long end, the gap is shrinking and pulling capital back to Japan. At the short end, the gap stays wide — and that is precisely why the carry trade lives on. Show only the one chart and write "the carry trade is dead" beneath it, and you've conflated the two.

Where we are now (as of 16 June 2026)

Contrary to what the headlines suggest, the trade is not unwinding right now — it's reviving.

On 16 June the Bank of Japan raised its policy rate by a quarter point to around one percent, the highest since 1995. The decision passed seven to one; the drivers were the weak yen and rising inflation, partly fuelled by the Middle East war. Notably, Governor Ueda was absent due to illness — the first regular meeting without a sitting governor.

The yen was unimpressed. After intervention buying of 11.7 trillion yen — about 73.5 billion dollars — in May, it still traded near the 160-per-dollar mark. And speculators are again betting heavily on a weak yen: their bets against the currency have climbed to a nine-year high. The carry trade is thriving again, partly because markets have been relatively calm of late.

The picture isn't without cracks, though. Early in the year there was already a warning shot. The yen jumped from 160 to 152 within weeks, triggering automatic sell orders and setting off an orderly partial unwind. In the first quarter of 2026 alone, Japan sold around 30 billion dollars of US government bonds — the fastest pace in four years.

How it might play out

The direction is clear: the rate gap is narrowing. The Bank of Japan is likely to keep hiking in 2026 — economists at ING expect half a percentage point in total — while the US central bank leans toward cuts. Both sides are converging. Some observers expect the yen carry trade to become a thing of the past within a few years.

The decisive threshold isn't the rate, it's the exchange rate. Markets treat the 150-yen-per-dollar level as a psychological red line. If the yen strengthens beyond it, toward 145 or 140, repaying yen debt becomes so expensive that a sharp sell-off in equities grows more likely. An orderly normalization is digestible; an abrupt appreciation would not be.

What it means for stocks and crypto

The path by which a carry-trade unwind spreads is mechanical, not psychological. It starts in the currency market, moves through rising volatility and tighter risk limits into equities and bonds, and finally reaches Bitcoin as plain selling pressure. Crypto often gets hit first — because it trades around the clock and runs on the most leverage. On top of that, a stronger yen pulls domestic capital into Japanese bonds and out of risk assets.

Here a number is circulating that we deliberately handle with care. One analyst has calculated that every Bank of Japan hike since March 2024 came with a Bitcoin decline of between 18 and 32 percent, around 27 percent on average. That sounds like a law of nature — but it isn't one. It's all of five cases. By our own rule: under thirty observations, that's an anecdote, not a dependable edge. A time-link is not causation, the windows are loosely drawn, and it's exactly the kind of statistic that marketing inflates into a supposed law. Anyone honest with numbers calls it a pattern worth noting — and tests it rather than believing it.

The situation is delicate all the same. Bitcoin currently trades more than 50 percent below its October 2025 high. So there's no preceding uptrend to act as a cushion, which makes the market more vulnerable at key support levels. But part of the calmer read is this: today's setup is less explosive than 2024, because much of the trade was already shaken out last year and a hike is now broadly expected. The surprises that trigger real crashes look different.

Frequently asked questions

Is the carry trade dying now? Not as fast as many claim. At the long end the rate gap is shrinking; at the short end — where the trade is funded — it stays wide for now. Structurally the trend points down over years, but an abrupt death is not the base case.

Why does Bitcoin react so strongly to a Japanese central bank? Because a lot of the capital in crypto stems indirectly from yen loans, and because Bitcoin trades around the clock with heavy leverage. When leverage is cut elsewhere, the most liquid asset gets sold first — and that's often crypto.

Is it true that every Japanese rate hike crashes Bitcoin? There was such a pattern across the recent hikes. But five cases are not a statistic to bet on. We treat it as a signal, not a rule.

What should I actually watch? Above all, the speed of the yen exchange rate. A sudden, sharp appreciation past the 150 level is the most important warning sign — more important than the level of the rate itself.

How big is the carry trade really? Nobody knows exactly. Estimates range from roughly 250 to 500 billion dollars. That uncertainty is itself part of the risk.

What Backtesting Arena contributes

Macro narratives like this one live on round numbers and catchy stories. Our contribution is a soberer one: we take only concrete, verifiable facts — and flag openly where a number is really a range or an anecdote. The "27 percent per hike" figure is the best example: a catchy number drawn from five cases that doesn't survive an honest check.

That same stance is built into the platform. If you want to test a strategy on the yen, on Bitcoin or on equity indices, you'll see not just the return but the drawdown, the risk, and the number of trades a result rests on. Because a claim is only worth as much as the sample behind it.

This is not investment advice. We're not financial advisors — this post frames a publicly debated market topic with sourced numbers.