The Bank of Japan is moving closer to an earlier-than-expected interest rate hike, but this path is increasingly fraught with risk. Any tightening measure could be neutralized by political demands to support the government bond market. As the government's spending plans push up bond yields, the central bank finds itself in an increasingly awkward balancing act. It must pursue policy normalization while simultaneously fending off calls to resume large-scale bond purchases—the very operations it is now trying to exit.
Premier's Fiscal Expansion Pushes Yields Higher
Premier's expansive fiscal agenda has driven up Japanese government bond yields, raising borrowing costs for the most indebted nation among developed economies. This has also sparked discontent in the United States over spillover effects on the US Treasury market. Last month, the Premier pledged to strengthen communication with the market to maintain confidence in Japan's fiscal health. Domestic media reported that during a meeting with Bank of Japan Governor in May, she urged the central bank to increase bond purchases if necessary to curb long-term interest rate rises. Her allies have since made statements highlighting the government's unease over rising yields and the central bank's balance sheet reduction. In July, one of the Premier's reflationist aides stated that the government was "very focused" on bond yield movements and had conveyed to the central bank investor concerns about its "too rapid" balance sheet reduction. Another aide, appointed by the Premier to a government advisory panel, pointed out that "the Premier's government places more weight on the quantitative aspects of monetary policy, rather than traditional tools like rate hikes." The economic and fiscal policy minister also warned of the economic consequences of the central bank's balance sheet reduction and urged prioritizing market stability. Some analysts believe these pressures may have already had an effect, noting that the Bank of Japan's decision to raise interest rates in June was accompanied by a pause in its bond reduction plan scheduled for the next fiscal year.
Central Bank Insists on Normalization, Resists Resuming Bond Buying
For the Bank of Japan, resuming large-scale bond purchases would contradict its years-long efforts to exit ultra-loose policy. The central bank ended its yield curve control program in 2024 and initiated a bond reduction plan as part of a broader normalization strategy. Reversing course now could undermine the credibility of this transition and make it difficult to revive a market that has been dormant due to years of massive buying. The central bank emphasizes that it will only increase bond purchases through emergency operations if yields rise in a disorderly manner disconnected from fundamental economic conditions and threaten financial stability. To counter political pressure, the central bank last week released a research report arguing that rising inflation, not its slowing of bond purchases, is the main factor driving up bond yields. Minutes from the June policy meeting also reveal that board members have begun discussing the final size of the central bank's balance sheet, signaling a continued push toward normalization. One member stated that if the market interpreted the central bank's bond purchases as monetizing debt or suppressing yields, it could damage the central bank's credibility. A former central bank official believes these detailed discussions suggest policymakers may be preparing to announce a final balance sheet target, in response to criticism that "the central bank is manipulating the pace of bond purchases based on government pressure."
Market Pressure May Ultimately Force Central Bank's Hand
Despite this, the market remains uneasy about the Premier's expansive fiscal agenda, continuously exerting upward pressure on yields. On Monday, the 10-year Japanese government bond yield rose to 2.805%, approaching the 3% threshold that some analysts believe could trigger a new wave of selling. While the central bank does not target a specific yield level, informed sources indicate that if volatility becomes rapid and one-sided enough to threaten financial stability, the central bank may intervene. A rates strategist at Nomura Securities noted, "If a surge in yields is driven by insufficient domestic investor demand for government bonds, the central bank may have no choice but to step in. This is the price the central bank pays for its long-term dominance of the bond market and the implementation of ultra-loose policy." Currently, the market remains focused on the pace and timing of future rate hikes, but the political dynamics surrounding rising yields and how the central bank's balance sheet reduction plan might adjust during periods of stress are becoming key areas to watch.
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