Bank of Japan signals possible interest rate hike in December amid yen’s decline

The Bank of Japan (BOJ) is increasingly preparing markets for the possibility of an interest rate hike as early as its December meeting, with several senior officials signalling a shift towards a more hawkish stance amid growing concerns over the yen’s sharp decline and its inflationary impact. This marks a notable change from the cautious tone that had prevailed earlier in the year, as the BOJ balances its traditional dovish posture with mounting economic pressures and political developments.

According to sources familiar with the bank’s thinking, messaging in recent days has pivoted back to highlighting the inflation risks associated with a weak yen, moving away from earlier concerns centred more on the US economy. This strategic communication appears aimed at setting expectations ahead of the pivotal policy meeting on December 18-19, signalling the BOJ’s readiness to raise rates if necessary.

The backdrop to this shift includes a key meeting last week between Prime Minister Sanae Takaichi, known for her dovish fiscal and monetary approach, and BOJ Governor Kazuo Ueda. The encounter seems to have eased immediate political resistance to rate hikes from the new administration. Finance Minister Satsuki Katayama echoed this softer stance, expressing “no particular objection” to the BOJ’s likely tightening trajectory and underscoring coordinated vigilance over market developments.

Indeed, several BOJ board members have publicly voiced support for a near-term rate increase. Junko Koeda emphasised the need to keep raising real interest rates to counter persistent inflation, while Kazuyuki Masu remarked that the timing for tightening is “nearing,” sentiments that contributed to government bond yields hitting multi-decade highs. Governor Ueda, often considered the most dovish on the board, has tempered his previous reluctance, stating in parliament that the bank will discuss the “feasibility and timing” of rate hikes in upcoming meetings, reflecting evolving internal consensus.

The case for tightening policy is strengthened by an expanding view within the BOJ that the yen’s prolonged weakness is not transient, but rather a trend with the potential to stoke inflation more persistently than before. A weak yen raises import costs, which weigh heavily on Japan’s inflation outlook. The BOJ’s own data on services producer prices shows ongoing inflationary pressures, with a 2.7% year-on-year increase recorded in October 2025, despite a slight slowdown from previous months. This persistent inflation is partly driven by labour shortages in key sectors like hotels and construction, underpinning the central bank’s readiness to normalise monetary policy after ending its ultra-loose stance just last year.

However, the decision to hike in December versus waiting until January remains finely balanced, with the US Federal Reserve’s policy decision a critical external factor. The Fed meeting, held just a week prior to the BOJ’s, could influence yen movements and derail or reinforce the BOJ’s tightening path. If the Fed opts to hold rates steady or signals no imminent cuts, this may pressure the BOJ to act sooner to prevent further yen depreciation. Conversely, a Fed rate cut could bolster the yen and lessen the urgency for the BOJ to raise rates immediately, though it would raise broader challenges about the outlook for global growth and inflation.

Market responses to this evolving outlook have been notable. The yen steadied recently amid speculation of a December rate hike but remains vulnerable, trading around 156 per dollar after hitting a 10-month low. Some analysts suggest that Japan could actively intervene in the currency markets to support the yen, utilising its extensive foreign reserves to moderate sharp declines. Takuji Aida, an economist advising Prime Minister Takaichi, has publicly endorsed such intervention to reduce adverse inflationary impacts from a weak yen while maintaining stimulus through low interest rates and government spending.

Financial strategists also point out that while political figures like Takaichi’s economic advisers still voice concerns about the potential risks of near-term rate hikes, the absence of overt opposition during recent high-level discussions suggests a growing political alignment with the BOJ’s gradual normalisation approach. Investors and market strategists, including Man Group’s chief market strategist Kristina Hooper, see an underlying drive within the BOJ to move away from endemic ultra-low rates, acknowledging the necessity of normalising policy to sustain economic stability.

In summary, the BOJ is navigating a complex landscape of domestic inflation pressures, currency volatility, and evolving political dynamics as it prepares for a likely policy shift in December. While uncertainties remain, particularly in relation to US monetary policy and potential market reactions, the central bank’s recent hawkish signals reflect a clear intent to rein in inflation risks heightened by the sluggish yen and to steadily bring interest rates back towards more conventional levels.