Bank of Japan Raises Rates to 1.25%, a 31-Year High, in Fastest Hike of Its Current Cycle

The Bank of Japan raised its benchmark policy rate by 25 basis points to 1.25% on September 18, the highest level since 1995, in a 7-2 vote that accelerated the pace of its tightening cycle. The move came three months after the previous hike, compared with a six-month gap before that, marking the fastest rate of increase since the BOJ began normalizing policy in March 2024. Dissenters were board members Toichiro Asada and Ayano Sato, both reflationist appointees of Prime Minister Sanae Takaichi. The BOJ said it acted to counter the risk that inflation would deviate upward beyond its 2% target, a concern sharpened by soaring oil costs and a weak yen. August core CPI came in at 1.7% year-over-year. Reuters reported the BOJ signaled readiness to keep pushing borrowing costs higher, joining other major central banks in fighting persistent inflation pressures.

The yen paradoxically fell after the decision, with analysts citing the prior hawkish Federal Reserve move that had already pressured the currency. Strategists warn that if markets conclude the BOJ cannot tighten as fast as the Fed, the dollar-yen rate could move toward 160, putting currency intervention back on the table. Japanese officials have stressed concern about the speed and disorderliness of yen moves rather than any specific level. Traders were watching Governor Kazuo Ueda's post-decision press conference closely for guidance on the future pace of hikes.

The rate decision landed alongside a $6.2 trillion triple-witching options expiration, amplifying volatility risks across global markets. Beyond the yen, the broader market concern centers on carry trades: higher Japanese yields make borrowing cheap yen to fund investments in higher-yielding assets less attractive, adding pressure on global equities and risk assets more broadly. Japan's government debt exceeds 200% of GDP, meaning rising rates also increase the country's interest costs significantly.