The most significant shift in market expectations regarding the Bank of Japan's monetary policy is a consensus that the central bank will tighten at a faster pace than its recent slow rhythm. All 52 economists in a Bloomberg survey predict a rate hike on September 18, with about 93% expecting at least one more increase by January next year. The proportion anticipating quarterly hikes has reached 46%, while those expecting semi-annual moves have plummeted from 82% in July to just 6% in the latest Bloomberg economist survey. However, the median forecast for the terminal rate of this tightening cycle remains around 1.75%. Based on the current policy rate of 1% and 25-basis-point increments, this implies there is still room for three more hikes, including the anticipated September action.

For global equity markets, this means the timeline for rising funding costs has been pulled forward unexpectedly. An accelerated BOJ tightening path would significantly raise the financing costs of yen carry trades—the strategy of borrowing cheap yen to invest in higher-yielding overseas bonds and equities—which has been a crucial pillar supporting the bull market in international stocks outside Japan in recent years. As the rate-hike clock moves faster, global markets face a repricing of yen funding costs. Even if rates rise to 1.25%, the BOJ internally expects financial conditions to remain accommodative, but the ongoing energy shock is undoubtedly reinforcing the urgency of the central bank's hawkish stance. Japan's corporate goods prices rose 7.6% year-on-year in August, while yen-denominated import prices surged 24.8%, indicating that fuel price increases and the earlier yen depreciation are still transmitting into corporate costs. Major global economies are broadly facing tighter pressures recently. The European Central Bank raised rates by 25 basis points on September 10, lifting the deposit rate to 2.5%. Ahead of the U.S. Consumer Price Index release on September 11, futures markets priced a 71.1% probability of a 25-basis-point Fed hike in September, up from 61.2% in the previous session. Meanwhile, Houthi forces seized Yemen's Al-Mukha port, threatening Red Sea shipping, while U.S.-Iran strikes have kept transit through the Strait of Hormuz constrained. Brent crude surged over 6% on September 10 to approach $110 per barrel. On September 11, reports emerged that diplomats from Gulf states were attempting to negotiate temporary passage arrangements with Iran, causing oil prices to retreat to $105.99 by 06:43 GMT, though weekly gains still exceeded 10%. This pattern of constrained supply and on-off negotiations will heighten central bank vigilance over energy price increases persistently transmitting to other goods and services. Using the February 27 close of $72.48—the last trading day before the U.S.-Iran war began—as a baseline, Brent prices have now risen over 50% since the conflict started.

From an equity investment strategy perspective, faster BOJ tightening simultaneously impacts funding, exchange rates, and valuations. Rising yen borrowing costs, if accompanied by rapid yen appreciation, could prompt some carry trades to reduce positions, amplifying volatility in global risk assets. Elevated U.S. and European rate expectations further pressure AI-themed growth stocks that rely on high valuations and long-dated earnings growth trajectories. An accelerated BOJ tightening path raises the financing cost of carry trades that borrow cheap yen to invest in overseas high-yield assets. If coupled with rapid yen appreciation, investors also face exchange losses when repaying yen-denominated debt, potentially triggering margin calls or forced liquidation of leveraged positions. The liquidation process—selling overseas stocks and buying back yen to repay debts—could further boost the yen, creating a feedback loop where currency moves and asset selling reinforce each other, amplifying global equity market turbulence. Therefore, a faster BOJ tightening pace would significantly raise carry trade funding costs and potentially weaken its capital support for overseas equities and other risk assets. If combined with sharp yen appreciation, it could also magnify deleveraging pressures.

However, BOJ rate hikes do not necessarily trigger a carry trade collapse. The key lies in whether the policy path and tone exceed expectations, how domestic and foreign rate differentials evolve, the pace of yen appreciation, and the crowdedness of leveraged positions. Japanese banks stand to benefit from higher loan yields but must still assess deposit costs, bond valuation losses, and credit risks, while exporters are more sensitive to yen strength and overseas demand. Since the September hike is widely expected, what truly matters for future market moves is the vote split, Governor Kazuo Ueda's communication regarding timelines for subsequent or additional hikes, and whether the terminal rate is revised upward. After the September increase, another hike is expected by January at the latest. The shift from semi-annual to quarterly steps marks a comprehensive front-loading of Japanese rate hike expectations.

BOJ to Hike Again by January at Latest: From Half-Year Steps to Quarterly Pace, Rate Expectations Move Forward

The latest Bloomberg survey of economists shows unanimous expectations that the Bank of Japan will raise its benchmark rate next week and again by January at the latest, significantly accelerating policy normalization. All 52 BOJ watchers predict borrowing costs will rise at the two-day meeting ending September 18. About 93% expect another move by January, with roughly one-third forecasting a December hike. The remaining respondents chose January, and no one predicted back-to-back hikes in October. The survey reflects a dramatic shift in economist views: in the previous July survey, no one expected a September adjustment. The BOJ faces upside inflation risks, and U.S. Treasury Secretary Scott Bessent's repeated calls for action have also boosted market expectations for a hike this month. Izuru Kato, chief economist at Totan Research Institute, wrote in his survey response: "The BOJ may signal to markets that rate hikes will typically come at intervals of about three months. The focus will be on how strongly it hints that the frequency could increase even further if conditions allow."

The data have been highlighting inflation risks. The BOJ said Friday that Japan's August corporate goods prices rose 7.6% year-on-year, little changed from July's revised 7.7% gain, which was the fastest since February 2023. About 46% of respondents believe the BOJ's rate hike pace will accelerate to roughly once per quarter, contrasting with the prevailing view a few months ago of semi-annual adjustments. Around 36% expect intervals of four to five months, while the share expecting semi-annual hikes tumbled from 82% in July to just 6% in the latest survey. Bessent ordered the first coordinated yen-buying intervention in 28 years in late July to help prevent further yen declines. This week, he challenged speculators with highly unusual remarks for his position, further underscoring his commitment to defending the yen. About 82% of respondents said that following the U.S.-Japan coordinated yen intervention, the government led by Prime Minister Takaichi Sanae would find it difficult to oppose a BOJ rate hike this month. An overwhelming majority said Bessent's repeated comments supporting further hikes are an attempt to ensure Sanae does not obstruct the central bank. Sanae is known to generally support monetary easing, though there is no evidence she would oppose this month's move. Naoki Hasegawa, chief bond strategist at Okasan Securities, said: "Rather than directly urging the BOJ to hike, the U.S. is pressuring the government not to hinder the central bank's policy normalization."

Several respondents highlighted the importance of next week's policy rate vote. Market attention is particularly focused on two policy board members—Ayano Sato and Toichiro Asada—both personally selected by Sanae to join the nine-person committee. Ryutaro Kono, chief Japan economist at BNP Paribas, said: "If they support a hike, markets will likely interpret that government pressure on the BOJ to maintain easy policy has significantly weakened. If they oppose, investors may see it as a signal that political pressure to keep rates low remains." Despite expectations for faster policy normalization, economists' forecasts for the terminal rate of this tightening cycle have not changed much. The survey shows the median remains at 1.75%, implying three more hikes, with the highest expectation still at 2.5%.