TOKYO—Tokyo's core consumer price index rose 2.8% year-over-year in November, matching October's pace and exceeding the 2.7% forecast, data released this morning showed. Under normal circumstances, inflation running persistently above the Bank of Japan's 2% target would support the yen through expectations of tighter monetary policy. Instead, the currency languished near 156 against the dollar, undermining what should have been a straightforward policy signal with a more troubling narrative: Japan's fiscal credibility is eroding faster than its inflation can support rate normalization.

Prime Minister Sanae Takaichi's government approved a ¥21.3 trillion ($135.5 billion) stimulus package on November 21, featuring ¥17.7 trillion in general account spending—the largest since the COVID-19 pandemic. The package includes ¥2.7 trillion in tax cuts, with taxes on gasoline eliminated entirely, alongside subsidies for electricity and gas bills amounting to about 7,000 yen per standard household over three months starting January.

Takaichi told reporters the government will use revenue to fund the package, with any shortfall covered via issuing government bonds —a framework that Jesper Koll, expert director at Tokyo-based Monex Group, warned will spook Japanese government bond markets. His concerns have proven prescient: 10-year JGB yields hit their highest levels since 2008 last week at 1.817%, a dramatic move in a market historically defined by near-zero rates and central bank yield curve control.

The contradiction embedded in Japan's current policy mix reveals the yen's fundamental challenge. Tokyo's core-core CPI, which excludes both fresh food and energy, held at 2.8% in November, demonstrating that inflation pressures extend beyond volatile commodity categories into underlying price dynamics. Food prices remain particularly elevated, with rice and dairy costs continuing to pressure household budgets.

This inflation persistence should theoretically force the Bank of Japan toward more aggressive tightening, supporting the yen through interest rate differentials. Yet the stimulus package represents a jump from the ¥13.9 trillion former Prime Minister Shigeru Ishiba unveiled last year, with the larger size requiring additional bond issuance bigger than last year, putting more pressure on the country's finances.

Japan's economy contracted at a 1.8% annual pace in July-September, marking the first contraction in six quarters and providing political justification for Takaichi's expansionary approach. But the timing couldn't be worse for currency bulls: massive fiscal expansion amid persistent inflation creates the conditions for currency weakness rather than strength, as bond markets price in deteriorating fiscal sustainability.

Takaichi emphasized that full consideration had been given to fiscal sustainability, noting that the amount of government bonds would likely be lower than last year's 42.1 trillion yen issued after the supplementary budget. Yet with Japan's national debt already about triple the size of its economy, markets remain skeptical that modest reductions in issuance materially improve the trajectory.

The Bank of Japan is preparing markets for a possible interest rate hike as soon as next month, with sources saying the central bank has shifted focus back to inflationary risks of a weak yen from earlier worries about the U.S. economy. Comments from various officials including Governor Kazuo Ueda reflect a growing view within the bank that a weak yen has become a trend and could drive up inflation more than in the past.

A Reuters poll showed a slim majority of economists expect the BoJ to hike rates at its December 18-19 meeting, with all projecting a hike to 0.75% by March next year. Yet the decision remains extraordinarily complex, entangled in political dynamics, fiscal policy contradictions, and external factors beyond the BoJ's control.

After his meeting with Takaichi last week, Ueda said the premier seemed to have acknowledged the BoJ's plan to gradually raise rates to guide inflation smoothly toward its 2% target, a significant development given that Takaichi has called BoJ rate hikes "stupid" in the past and is seen as a proponent of "Abenomics"—the economic strategy espousing loose monetary policy and fiscal spending.

Finance Minister Satsuki Katayama said last week she had "no particular objection" to the BoJ's rate-hike path, and that the government and central bank will stay vigilant to market moves. This apparent political clearance removes one obstacle to December action, though it doesn't resolve the underlying policy tension between the government's stimulus approach and the central bank's normalization trajectory.

Bank of Japan board member Junko Koeda signaled the possibility of a rate hike as soon as next month by pointing to the need for normalization after the yen hit its lowest level in 10 months, while BoJ board members Hajime Takata and Naoki Tamura dissented at the October meeting, proposing raising the short-term interest rate target to 0.75% from 0.50%—a sign that hawkish voices on the board are pushing for faster normalization.

The Federal Reserve's rate decision, which comes a week before the BoJ's on December 10, is seen as potentially swaying yen moves. The mechanism is straightforward but creates uncomfortable dependencies: if the Fed holds rates steady or signals fewer future cuts, dollar strength would weaken the yen further, increasing pressure on the BoJ to hike. Conversely, a Fed cut could support the yen but raise questions about U.S. economic health that complicate the BoJ's own normalization path.

U.S. Treasury Secretary Scott Bessent met with Finance Minister Katayama and highlighted "the important role of sound monetary policy formulation and communication in anchoring inflation expectations and preventing excess exchange rate volatility"—diplomatic language that amounts to pressure on Tokyo to tolerate yen strength through higher rates.

Bessent wrote on X that "the government's willingness to allow the Bank of Japan policy space will be key to anchoring inflation expectations," while Katayama said the yen's real value was likely about 120-130 against the dollar, about 26% stronger than the current level around 152. This rare public discussion of appropriate currency levels by both governments signals that yen weakness has moved from market dynamic to diplomatic concern.

USD/JPY traded around 156.38 on November 28, with the yen weakening 2.39% over the past month and down 4.39% over the past 12 months. The persistence of yen weakness despite inflation above target and rate hike expectations reveals how fiscal concerns have overwhelmed traditional monetary policy signals.

Despite Tokyo CPI data showing inflation remains sticky well above the BoJ's 2% target, the yen fails to attract buyers. Currency markets are pricing a scenario where the BoJ remains trapped between incompatible objectives: raising rates enough to control inflation while avoiding fiscal stress that massive stimulus packages have amplified.

The "sell Japan" trade appears to be gaining momentum, with investors simultaneously shorting JGBs (driving yields higher) and avoiding yen exposure. This dynamic differs fundamentally from traditional rate normalization cycles, where higher rates attract capital inflows seeking yield. Instead, markets view Japanese rate hikes as inadequate responses to fiscal deterioration rather than attractive investment opportunities.

Governor Ueda said at the October press conference that he has "no preset ideas about timing of next rate hike" and wants to "take a little longer to see how the US tariff impact would affect Japanese economy", though he noted "don't think there is risk of falling behind the curve"—language that suggests the BoJ remains confident in its gradual approach despite market skepticism.

Markets face three potential outcomes from the December 18-19 BoJ meeting, each carrying distinct implications for the yen and Japanese assets.

First, the BoJ hikes 25 basis points to 0.75%, signaling confidence that wage growth will materialize and that political obstacles have been cleared. This scenario would provide temporary yen support but raises questions about the pace of subsequent hikes—particularly if fiscal stimulus continues expanding.

Second, the BoJ holds rates at 0.5%, citing need for additional wage data and concerns about U.S. economic uncertainty. This outcome would likely send USD/JPY toward 160 as markets price in extended accommodation, testing intervention thresholds and accelerating "sell Japan" momentum.

Third, the BoJ delivers a hawkish hold—keeping rates unchanged but strengthening forward guidance about January or March action. This middle path attempts to prepare markets without committing to immediate action, though it risks appearing indecisive amid clear inflationary pressure.

Current overnight index swap pricing implies just 9% probability of a 25-basis point hike in December, rising to 47% by January and 85% by March, suggesting markets view near-term action as unlikely despite recent hawkish rhetoric. A full 25 basis point hike is not fully priced until June 2026—a timeline inconsistent with the BoJ's stated normalization trajectory.

The package is meant to raise Japan's gross domestic product by 24 trillion yen ($155 billion), or an annualized rate of 1.4%, according to the Cabinet Office—an optimistic projection that assumes stimulus translates efficiently into growth without generating offsetting inflation or crowding out private investment.

Opposition lawmakers and experts have questioned whether the package will be effective in attaining its aims, noting that any impact on inflation from cutting energy costs is expected to be transient since increased demand from other stimulus would tend to push prices higher. This observation highlights the policy incoherence: stimulus designed to relieve cost-of-living pressure may ultimately worsen inflation, requiring tighter monetary policy that increases fiscal costs.

After more than 10 years of large-scale monetary easing, there is a strong possibility that expectations for economic activity are based on the assumption of ultra-low interest rates, meaning there is risk that negative effects of rising interest rates will be exposed, particularly for entities vulnerable to such increases. This dependency on accommodation—built over decades—cannot be unwound quickly without economic disruption.

The yen's failure to respond to positive inflation data reflects markets pricing these structural challenges rather than merely reacting to monthly data points. Currency strength requires not just inflation and rate hikes but credible frameworks for fiscal sustainability, productivity growth, and economic dynamism that Japan currently struggles to demonstrate.

As Tokyo's inflation data landed this morning showing sticky price pressures, the yen's muted response told the real story: in Japan's current policy environment, traditional monetary signals have been overwhelmed by fiscal concerns that no amount of CPI data can offset. Whether the December BoJ meeting marks a turning point—where rate normalization regains credibility—or another chapter in gradual yen erosion will depend not on inflation prints but on whether Takaichi's government can reconcile stimulus ambitions with the fiscal constraints that global bond markets are increasingly unwilling to ignore.