Japan’s carry-trade unwind is not done. The yen tells you when.
USDJPY at 157.20 is 4 yen from the MOF's implicit intervention threshold. With Ueda's BoJ signalling October hike, the carry-trade unwind that started in August 2024 has another leg to go.
October 2026 Update: The carry-trade unwind this piece flagged is still not done — and the yen has just proved it. After the violent move earlier in 2026 that drove USD/JPY from the 157 handle down to around ¥147.64, the pair has round-tripped: the yen traded at ¥157.66 per dollar on October 27, 2026, slipping about 0.1% as risk appetite returned ahead of central-bank meetings. The Bank of Japan has continued normalising — its policy rate now stands at 1.25%, up from 0.75% — yet the yen has drifted all the way back to the range the carry trade was anchored in for most of 2024 and 2025. Markets expect the BoJ’s upcoming meeting to leave rates unchanged at 1.25%, while swaps increasingly price a move to 1.50% in early 2027. The tell is in the tape: over October 6–27 the Nikkei fell about 12%, but USD/JPY moved only from ¥158.12 to ¥157.13 — a 0.6% yen gain — showing equity-market stress has not yet produced a comparable currency surge. The yen did log its strongest week since early September in the week ending October 23, gaining roughly 0.75% on technology-stock jitters. The structural unwind, in other words, has barely begun to transmit to FX.
USD/JPY was last trading around ¥157.66, with the yen slipping about 0.1% on the session as risk appetite returned ahead of central-bank meetings. That is right back in the 157-160 range this trade was anchored in for most of 2024 and 2025 — a remarkable round-trip given the BoJ has taken its policy rate to 1.25% over the same stretch. It confirms that the fault line flagged back then — the gap between BoJ guidance and market pricing, and now between a rising policy rate and a still-weak currency — has not closed. The question now is not whether the unwind happens, but why so little of it has shown up in the yen even with rates this high.
What is at stake is the unwinding of an estimated $20 trillion structural short-yen position built over a decade and a half of zero rates. The August 2024 unwind — when USDJPY dropped from 161 to 142 in three weeks and the Nikkei fell 12% in a single session — was, at the time, the most violent single-asset deleveraging since the 1998 LTCM crisis. The IMF and BIS estimated that roughly $400-500bn of carry-trade exposure was unwound in that episode, against a total estimated short-yen position of $20tn across hedge funds, mutual funds, official sector reserves, and Japanese household FX deposits — under 3% of the position at the time. Mid-2026 estimates had the speculative layer roughly 90% unwound (Goldman) and the all-in unwind 50-60% complete (JPMorgan); the yen’s retracement from the ¥147.64 low back to ¥157.66 since then suggests the fast, speculative layer has re-loaded yen shorts, leaving the far larger structural book — the part that moves slowly — still largely in place.
The Ueda communication strategy is deliberately ambiguous
Governor Ueda’s Tokyo Foreign Correspondents’ Club address argued that “underlying inflation has been gradually heading toward the price stability target” and that “the conditions for policy normalisation continue to be met.” That guidance has been borne out and then some: the BoJ has lifted its policy rate in steps to 1.25%, the highest in decades. The ambiguity was the policy. Excessive precision on the timing would have triggered the carry-trade unwind in advance and forced MOF intervention to manage the pace of dollar-leg depreciation. By keeping the timing fuzzy, Ueda preserved optionality and let the market do the work of pricing in each move — and while the first hikes drove USD/JPY to the ¥147 handle earlier in 2026, the pair has since retraced to ¥157.66 even as the rate climbed to 1.25%, an unusually weak currency response to a tightening cycle.
The complication at the time was that the Federal Reserve had shifted dovish on a similar timeline, narrowing the rate differential that drives USDJPY from both ends — BoJ rising, Fed falling. That combination is a large part of why the unwind, once it started, moved so fast. But the differential has stayed wide enough in absolute terms to keep pulling the yen back toward the 157 range even as the BoJ reached 1.25%. Speculative positioning data from the CFTC Commitment of Traders report showed leveraged funds’ bearish-yen positions rising to over 115,000 contracts as of June 9, 2026 — the highest level since November 2017 — and the pair’s retracement to ¥157.66 since then suggests much of that short-yen positioning has been rebuilt.
The MOF intervention math
Japan’s Ministry of Finance held roughly $1.27 trillion in foreign currency reserves per its most recent disclosure at the time, of which roughly $1.05 trillion was in US Treasuries and dollar deposits — the war chest built to defend the yen against excessive weakness. The April 2024 intervention spent approximately $62bn over two trading days to defend the 160 level; the May 2024 intervention spent approximately $36bn defending 161. That defense zone is suddenly relevant again: with USD/JPY back near ¥157.66 after round-tripping from the ¥147 handle, the pair is once more within striking distance of the 159-162 area MOF defended in 2024-25 against excessive yen weakness — only now that weakness coexists with a 1.25% policy rate, which makes a fresh bout of yen softness both more politically awkward and more likely to draw verbal or actual intervention. The playbook that mattered in the first half of 2026 — standing aside while the BoJ’s hikes removed the reason to be short yen — may be giving way to the older one of defending round numbers on the weak side.
| Episode | Date | USDJPY peak | Est intervention spend | Effect (30d) |
|---|---|---|---|---|
| Black Wednesday TMS | Apr 29 2024 | 160.20 | ~$36bn | USDJPY -2.8 yen |
| Second intervention | May 1-2 2024 | 161.95 | ~$26bn | USDJPY -4.6 yen |
| August unwind | Aug 5 2024 | 146 (low) | $0 (market move) | USDJPY -15 yen in 3 days |
| Q4 2024 stealth | Oct-Dec 2024 | 156 | ~$18bn (suspected) | USDJPY -2 yen |
| Spring 2025 | Apr 2025 | 158 | ~$22bn | USDJPY -3 yen |
The structural short positioning is the issue
The carry trade has multiple layers. The top layer is speculative — leveraged funds and prop shops borrowing yen at near-zero rates and parking it in higher-yielding dollar, Mexican peso, Brazilian real, and Turkish lira assets. That layer is reflected in CFTC data and unwinds first under stress; it is also the layer Goldman estimated was roughly 90% unwound in mid-2026, though the yen’s retracement to ¥157.66 since then points to those shorts being rebuilt. The middle layer is Japanese retail FX margin accounts at Gaitame Online and similar venues, which historically run heavily long USDJPY and capitulate in cascading stop-loss waves when the cross moves sharply in a session. The bottom and largest layer is structural: Japanese pension funds (GPIF, Pension Fund Association), life insurers (Nippon Life, Dai-ichi Life), and corporate treasuries holding hundreds of billions in unhedged or partially hedged foreign assets to capture the yield differential.
The structural layer is the dangerous one. It does not unwind on a daily basis — it unwinds once the BoJ raises rates enough that the cost of hedging FX exposure exceeds the additional yield earned on the foreign asset. That threshold was estimated at around 75bp of BoJ policy rate — and with the BoJ now at 1.25%, it has been cleared with room to spare. That is the paradox at the heart of this market: the policy rate is now comfortably past the level at which pension and life-insurer hedging programmes should ramp mechanically, yet USD/JPY sits back at ¥157.66, not far from where it started. Either those structural flows are being swamped by speculative shorts re-loading into the wide rate differential, or they are still ramping slowly and have yet to show up in the price. This is the basis for the view — JPMorgan’s mid-2026 estimate put the all-in unwind at 50-60% complete — that the structural leg is largely ahead of us rather than behind. The August 2024 episode was the leveraged layer panicking; the structural unwind is the one still in progress.
The Nikkei is doing the early signalling
Japanese equities have remained volatile through the unwind, and the dispersion between the Nikkei 225 and the S&P 500 continues to be one of the cleanest early-warning signals for carry-trade stress at the speculative layer. Japanese equities are typically a long-yen-funding trade for global allocators — funds borrow yen, buy Japanese equities, and earn the difference between equity returns and the funding cost. When the funding side gets uncertain, as it has with the BoJ at 1.25% and USD/JPY swinging, those positions unwind regardless of the fundamentals on the equity side. Watch the Topix banks index relative to the broader Topix: underperformance there, even as the BoJ turns more hawkish, is the tell that the marginal seller is reducing yen-funded exposure across the board rather than repricing for higher rates.
The cross with US equities still matters. In August 2024 the Nikkei led the S&P 500 by approximately 24 hours into the unwind. That lead indicator is flashing again: over October 6–27, 2026 the Nikkei fell about 12% while USD/JPY backed up only from ¥158.12 to ¥157.13 — a mere 0.6% yen gain. Equity stress is building, but it has not yet produced the comparable currency surge that a full carry-trade unwind would generate. Either the yen is lagging and has a sharp catch-up move ahead, or the equity sell-off is not (yet) carry-driven. Any session where USD/JPY finally breaks lower against the current ¥157.66 level — as it briefly did on October 22, when the pair dropped 0.66% to ¥157.07, a near three-week high for the yen and below its 50-day moving average — would be the signal that the FX leg is catching up to the equity leg.
What this means for crypto and global duration
The August 2024 carry-trade unwind took Bitcoin down 18% in three sessions, despite no Bitcoin-specific catalyst. The mechanism was deleveraging — funds unwinding yen-funded long positions sold whatever was liquid, and BTC was among the most liquid risk assets in the global book. The same dynamic applies in 2026: BTC is now meaningfully more institutional than it was in 2024 and therefore more correlated to the equity tape that gets hit first. With the yen back at ¥157.66 and the structural unwind — JPMorgan’s mid-2026 read put it at 50-60% complete — still largely ahead, the risk of BTC underperformance on a beta basis has not passed. If anything, the fact that the Nikkei is already down about 12% over three weeks while the yen has barely moved means the FX catch-up that historically does the real damage to risk assets may still be in front of us. A hedge against a delayed yen-strength episode, sized to the position rather than to a specific option strike now that USD/JPY has round-tripped back near its old range, remains the cleanest way to carry that tail risk.
The duration read-across is the opposite direction. A yen-strength episode is typically associated with global risk-off, which is positive for long-duration Treasuries through the safe-haven channel. The 30-year Treasury rallied 22bp during the August 2024 unwind in three sessions. With the BoJ now at 1.25% and the carry trade’s structural leg still unwinding, the setup for a Treasury rally into the next phase of the move remains intact — and because the yen has not yet delivered the risk-off surge the Nikkei’s 12% drop would normally trigger, that safe-haven move may still be ahead rather than behind.
What to watch next
Three things. First, further BoJ communication on the pace of normalisation from here — markets expect the upcoming meeting to leave the rate at 1.25%, with swaps pricing a move to 1.50% in early 2027; any signal that the next hike comes sooner would be the catalyst most likely to force the pension and life-insurer flows that are still largely outstanding. Second, MOF’s FX reserve disclosures and intervention rhetoric — with USD/JPY back near ¥157.66 and the old 159-162 defense zone within reach, a return of weak-yen intervention risk, rather than the strong-yen management of the first half of 2026, is now the live scenario. Third, the cross-currency basis on 3-month JPY funding, which is the cleanest read on whether the structural hedging programmes are accelerating or have stalled.
For risk-asset positioning, the gap between the speculative layer (Goldman’s mid-2026 ~90%-unwound view) and the broader unwind (JPMorgan’s 50-60%) is the trade — and the yen’s round-trip back to ¥157.66 has, if anything, widened it. If JPMorgan is right, the structural layer still has room to run and a delayed yen-strength surge — with knock-on pressure on BTC and other liquid risk assets, and support for long-duration Treasuries — is the base case, especially with the Nikkei already down about 12% and the currency yet to respond. If the speculative layer has simply re-loaded into the wide rate differential, USD/JPY could stay rangebound near 157 until the next BoJ hike forces the issue. Track BoJ communications, MOF reserve data, and the Nikkei tape on our events calendar and the live yen and curve data in the market hub.
The honest read: the August 2024 unwind was the appetiser, and the BoJ’s climb to 1.25% in 2026 should have been the main course — yet USD/JPY has round-tripped all the way back to ¥157.66, and JPMorgan’s mid-2026 estimate still put the all-in unwind at only 50-60% complete. The full carry-trade rebalancing has not finished; the remaining structural leg will likely play out across the rest of the BoJ’s rate-normalisation path toward 1.50% and beyond. Each step of that path is a yen-positive catalyst, and each catalyst has the potential to compress risk-asset prices globally. The clearest sign that the next leg has arrived will be the yen finally matching the equity market’s stress — right now the Nikkei is down about 12% and the yen has barely moved. Position with that asymmetry in mind. The yen tells you when. The Nikkei tells you it has started.