Japan's Policy Uncertainty and the Risks to Global Bond Markets

Japan's policymakers are sending mixed signals that could rattle global bond markets. On one hand, the Bank of Japan (BOJ) is cautiously tightening monetary policy, trimming stimulus measures and hinting at potential rate hikes. On the other, the Takaichi administration is doubling down on aggressive fiscal stimulus, prioritizing growth over fiscal discipline. This policy tug-of-war creates a volatile environment for investors, with implications that extend far beyond Tokyo's shores.

Let's start with the BOJ. In 2025, the central bank has taken concrete steps to recalibrate its ultra-easy stance. It announced plans to reduce Japanese Government Bond (JGB) purchases in June and later voted to sell ETFs and J-REITs to stabilize markets. These moves signal a gradual shift toward normalization, albeit one that remains cautious.

Most notably, two-year bond yields hit a 16-year high in December 2025, reflecting growing expectations of rate hikes. Governor has acknowledged these pressures, stating the BOJ will weigh the "pros and cons" of tightening further. The message is clear: the BOJ is no longer in full stimulus mode, but it's not rushing to normalize either.

Meanwhile, the is pulling in the opposite direction. , including cash handouts, energy subsidies, and investments in semiconductors and shipbuilding according to Kyodo News. This is the largest fiscal boost since the post-pandemic era, and it's backed by a strategic pivot away from achieving a primary budget surplus to focusing on economic growth as a path to long-term fiscal sustainability as the finance ministry states. The administration even scrapped a gasoline tax surcharge to ease inflationary pressures. While these measures aim to boost demand and wages, they also raise concerns about Japan's already bloated public debt.

Here's the rub: the BOJ's tightening and the government's spending spree are at odds. The central bank is trying to manage inflation and stabilize bond markets, while the Takaichi administration is injecting liquidity through fiscal largesse. This creates a dangerous feedback loop. Higher government borrowing could push up bond yields, forcing the BOJ to either absorb the pressure (undermining its tightening goals) or let yields run (risking market instability). According to a Bloomberg report, long-term bond yields have already surged to record highs due to fears of deteriorating public finances.

For investors, the risks are twofold. First, Japan's bond market-largely insulated from global investors for years-is now a potential source of volatility. If the BOJ falters in balancing fiscal pressures, yields could spike, triggering capital losses for holders of JGBs. Second, the ripple effects could spread globally. As Japan's debt-to-GDP ratio balloons, foreign buyers may demand higher risk premiums, pushing up borrowing costs elsewhere. Emerging markets, in particular, could face capital outflows if Japanese investors rotate into safer assets.

What's the playbook for investors? Diversify across asset classes and geographies, but stay nimble. The energy and semiconductor sectors in Japan could benefit from the government's targeted subsidies as reported by Kyodo News, while defensive plays like utilities might struggle with higher borrowing costs. In bonds, consider hedging against yen weakness or yield curve steepening. And keep a close eye on the BOJ's next moves-every tweak to its yield curve control framework could send shockwaves.

The bottom line? Japan's policymakers are walking a tightrope. The BOJ's gradual tightening and the Takaichi administration's growth-at-all-costs approach may work in isolation, but together, they create a recipe for uncertainty. For global investors, the lesson is clear: don't bet on stability in Tokyo.