The Bank of Japan is widely expected to keep its policy rate unchanged when its two-day meeting ends on October 30. Yet a drumbeat of hawkish remarks from senior officials this week — capped by Deputy Governor Ryozo Himino’s warning that delaying further tightening could “hurt the economy in the long run” — has convinced markets the pause is only temporary: interest-rate swaps now price an 80% probability of another hike in December.

The setup is unusual: barely a month after raising its overnight call-rate target to 1.25%, a 31-year high, the BOJ is debating whether its next move comes in December — and whether October’s quarterly outlook will declare that underlying inflation has roughly hit the 2% target.

October hold, December hike: the market’s base case

September’s increase, decided by a 7-2 board vote on September 18 and effective September 24, was the BOJ’s second hike in three months, following one in June. Governor Kazuo Ueda signaled the BOJ had entered a phase focused on preventing underlying inflation — the broad, demand-driven price trend that strips away one-off factors — from overshooting its target.

People familiar with the matter told the Japan Times on October 13 that the board sees little need for consecutive hikes absent signs that upside inflation risks will “increase abruptly,” while keeping December on the table. Pricing agrees: Brown Brothers Harriman’s October 18 note put swap-implied odds of a quarter-point move to 1.50% below 5% for October 30, against 80% for December 18.

Macrometer rate-path scorecard (compiled from BBH swap pricing and BOJ announcements; probabilities are market-implied, not BOJ guidance):

Sources: BBH note via EconoTimes (Oct 18); Reuters; Japan Times (Oct 13). Probabilities describe market pricing on the cited dates.

The inflation dashboard: pressure is broadening

The hawkish case rests on data that has turned decisively since the summer — part of a broader energy-driven inflation wave the BOJ itself cites as a pressure source. Macrometer’s compilation of Japan’s price signals shows pressure spreading from energy and corporate transactions into consumer-facing prices:

Sources: Reuters (Tokyo CPI, Oct 1); BBH/EconoTimes (forecasts); BOJ survey; Dow Jones/Morningstar (branch managers, Oct 8); FXStreet.

Two readings stand out. First, the acceleration is sharp: Tokyo’s core measure jumped 0.9 percentage points in one month, and the BOJ’s preferred trend gauge — excluding fresh food and energy — rose a full point to 3.0%. Second, this is no longer an energy-only story. The BOJ’s October 8 branch-managers report said cost-push increases are spreading from business-to-business transactions to consumer businesses, with more companies raising retail prices as they gauge consumer sentiment. Himino added a less-discussed driver: brisk global AI demand is boosting exports and capital expenditure, lifting prices from the demand side — echoing the IMF’s October assessment of AI investment as a force reshaping global growth.

The hawks are talking

Himino’s October 21 testimony was the week’s clearest signal: underlying inflation is “quite close to 2%,” he said, while “even after last month’s rate hike, financial conditions remain accommodative” — citing low real borrowing costs and strong bank lending. The punchline: “Given that inflation risks are high, delaying necessary adjustment to monetary support could materialise such risks and hurt the economy in the long run.”

He was not alone. Board member Junko Koeda said in Kumamoto on October 15 that the bank should not be “overly cautious” about further increases given “considerable upside risks to inflation,” adding that continued price rises across a wide range of consumer items suggested underlying inflation was “becoming anchored at around” the 2% target, and that the neutral rate sits “considerably above 1%.” Ueda himself has warned that underlying inflation may overshoot on a combination of Middle East conflict-driven energy costs, a weak yen, and brisk AI demand.

Why not hike now?

The counterargument is that nothing in the data demands urgency. “Inflation pressures exist but haven’t jumped, so there’s little reason to rush,” one BOJ source told Reuters on October 20. The same sources said the bank may slightly raise its fiscal-2027 core forecast from the 2.4% projected in July to reflect the renewed oil spike — but described any revision as minor, with little sign that second-round effects, in which the energy shock triggers a wage-price spiral, are becoming embedded.

On the demand side, Koeda herself described private demand as “somewhat soft,” and the branch-managers report noted budget-conscious consumers are pushing some firms to limit increases and expand low-priced lineups. The BOJ’s July outlook expected underlying inflation to reach 2%-consistent levels only “sometime between October and March 2028” — so an October declaration that it has “roughly hit” the target would be a signaling step, not a mechanical trigger.

What to watch next

Four dates will decide whether December’s 80% pricing survives:

1. October 23 — September national CPI. The consensus expects 2.1% headline inflation; a hotter print, especially in the ex-fresh-food-and-energy gauge, would harden the December case.
2. October 30 — The BOJ decision and quarterly outlook. Watch the language on underlying inflation: a shift from “approaching” to “roughly at” the 2% target would be the formal signal markets are waiting for.
3. December 18 — The meeting where swaps price an 80% hike probability.
4. The yen, daily — Sources told Reuters that a renewed slide in the currency, lifting import costs and broader inflation, is the one development that could still force the BOJ’s hand in October.

One external factor has eased: receding expectations of a US rate increase at the Fed’s October 27-28 meeting have taken pressure off the BOJ — a contrast with the Bank of England, where a November hike remains firmly priced. But with Tokyo inflation at 3% on the BOJ’s own trend measure and officials openly discussing overshoot risk, the direction of travel is unmistakable — even if the next step waits until December.

This article is for informational purposes only and does not constitute investment advice.