BOJ September Hike Odds Jump to 57% as Yen Weakness Mounts

Yen weakness is forcing the Bank of Japan to act sooner, with 57% of economists now pricing a September hike.

The Bank of Japan is increasingly likely to raise its policy rate to 1.25% in September, with 57% of economists now expecting a hike as yen weakness and above-target inflation force faster tightening.

"Currency stability has replaced wage data as the most urgent variable, and the window to wait for more evidence is narrowing as medium-term inflation expectations approach 2 percent," Tomohiro Ota, Japan economist at Goldman Sachs, said in an Aug. 25 note.

The survey, conducted Aug. 17-24 across 58 economists, marks a sharp jump from July, when only 5 percent predicted a hike this quarter. Ten economists forecast a further quarter-point move to 1.50% in October or December, while roughly 65 percent of respondents expect the policy rate to reach at least 1.50% by March 2027, a quarter earlier than projected in July. About 60 percent see rates hitting 1.75% by the end of the third quarter of 2027, and half of those surveyed expect the hiking cycle to end at that level.

The decision at the Sept. 18 meeting will set the tone for Japan's rate trajectory and currency direction, with markets already pricing roughly an 80 percent probability of a hike. If the BOJ holds and the yen slides further toward the ¥160-164 intervention zone, investors may read inaction as tolerance for a weaker currency, pushing inflation expectations and hike bets higher.

Inflation Overshoots Target, Tightening the Case

The "new core" consumer price index, a gauge closely watched by Governor Kazuo Ueda, rose 2.3 percent year-on-year in July, above the traditional core reading of 1.8 percent released by the government. The measure strips out fresh food and the effects of subsidies on gasoline and utilities, giving a cleaner read on underlying price trends. The Middle East conflict has pushed energy costs higher, and companies are passing on rising expenses to consumers.

Goldman estimates a 10 percent yen depreciation adds about 0.4 percentage point to new core CPI after 12 months, while a roughly ¥5 move in USD/JPY lifts inflation by just over 0.1 point. Naphtha price gains contribute another 0.2-0.3 point. The BOJ raised its policy rate to 1.00% in June, the highest in three decades, and its April outlook described underlying inflation as "close to 2 percent," with June and July statements flagging the risk of an overshoot.

Intervention Doubts and Fiscal Pressure Weigh on the Yen

The effectiveness of the July U.S.-Japan coordinated yen-buying intervention is being questioned, with 69 percent of economists calling it "not very effective" or "completely ineffective." The yen has since drifted back toward ¥159.29 per dollar, near the ¥160 level that triggered the earlier action. MUFG notes hike expectations have climbed to around 80 percent without spurring yen buying, a disconnect that leaves near-term risk skewed toward further weakness, while the Nikkei 225 has struggled to extend gains.

Politics adds another layer. Among economists surveyed, 89 percent believe Prime Minister Sanae Takaichi's tax cuts and expanded investment spending will push the yen lower and lift inflation expectations, complicating the BOJ's tightening path. Long and super-long Japanese government bond yields remain under upward pressure on reports of an expansionary budget for next fiscal year and speculation over a Cabinet reshuffle, MUFG said.

Goldman moved its next-hike forecast forward from January 2027 to September, then sees further increases in January and July 2027 to a terminal rate of 1.75%, up from a prior 1.5% neutral estimate. The last time the BOJ raised rates in June, USD/JPY traded near ¥157 before the coordinated intervention in late July. If the yen appreciates materially in coming weeks, Goldman said the September action could be delayed, while a slide through ¥160 would likely force the central bank's hand regardless of the data.

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