Japan dropped its September CPI data early Friday morning in Tokyo, and it landed exactly where the hawks needed it. Core CPI rose 2.1% year-on-year, topping the Bank of Japan’s 2% target for the first time in nine months, while core-core inflation, which strips out both fresh food and energy, came in at 2.4%.
USD/JPY slid to around 156.3 in early Asian trading, breaking sharply from the 158 area that had held since the start of October. That two-handle move in a single session is not noise. It is carry traders recalibrating.
What the BoJ Will Do Next
Some 69% of economists now forecast the Bank of Japan will raise borrowing costs from the current 1.25% to 1.50% in the fourth quarter, and about 80% of those who specified a month picked December. Almost nobody expects a hike when the bank concludes its Oct. 29-30 meeting. The shift in conviction has been swift.
Standard Chartered notes the market debate is shifting from whether the BoJ will hike again to when, while flagging that January 2027 remains its own base case. BoJ Governor Kazuo Ueda said earlier this week that underlying inflation is quite close to the central bank’s 2% target, strengthening market expectations for another move. Friday’s data removed any ambiguity about “close.” It arrived.
Electricity and gas subsidies are still holding down the core figure, which suggests underlying pressure is firmer than the 2.1% headline implies. The Takaichi administration cannot subsidize its way out of a structural inflation shift.
The Carry Trade Risk Traders Should Price Now
A December BoJ hike, priced at 1.50%, would tighten the screws on one of the most crowded funding trades in global markets. The yen carry trade involves borrowing cheaply in yen to buy higher-yielding assets around the world, US stocks included, and a forced unwind of those positions is exactly what American investors need to watch.
The transmission mechanism is straightforward and unpleasant. Should Japanese rates rise more rapidly than anticipated or the yen strengthen significantly, carry positions face substantial unwinding pressure, and investors who borrowed yen to purchase overseas assets would confront both higher funding costs and mounting foreign-exchange losses. If liquidity begins flowing back into Japan, a broad reallocation of capital could affect U.S. technology stocks, emerging-market equities, and cryptocurrency markets, draining liquidity from U.S. asset markets and amplifying volatility across the global financial system.
Japan holds about $1.07 trillion in US Treasuries, the largest single foreign holder in the latest Treasury Department data. If Japanese yields rise, domestic investors, banks, insurers, and pension funds have less incentive to invest abroad, and that potential repatriation of capital could ripple across global markets, tightening financial conditions far beyond Japan’s borders.
Trading Plan
The Oct. 29-30 BoJ meeting is a pass on fireworks. Watch Ueda’s press conference language instead: any upgrade to the inflation forecast or explicit acknowledgment that the 2% target has been sustainably cleared would harden December bets and push USD/JPY toward 154-155.
For equities, the near-term read-through is manageable. When the BoJ last raised rates in September 2026, the move mattered, but it was absorbed without a lasting break in US risk appetite. A telegraphed December hike carries less shock value than a surprise, which is the base case here. The risk is a hawkish tone at next week’s meeting that accelerates the unwind before December arrives. Keep position sizing in high-beta, yen-funded momentum names trimmed. The yen’s move to 156 is a warning, not the event itself.
