International investors are cautiously increasing their exposure to Japanese government bonds (JGBs) after a prolonged sell-off pushed 10-year yields above 2.5 percent for the first time this century. This sharp rise marks a 1.6 percentage point increase since the start of last year, making Japan's bond market the worst-performing among major economies during this period. Despite higher yields attracting some buyers, many asset managers remain hesitant due to concerns over Japan’s fiscal outlook, inflation risks, and the potential impact of extensive government spending.
The sell-off in JGBs has been driven by a combination of rising global interest rates, Japan’s substantial fiscal stimulus measures—including a recently announced $2 trillion long-term spending plan under Prime Minister Sanae Takaichi—and fears that inflation could accelerate. The Bank of Japan (BoJ), which maintained a policy of targeting near-zero yields for years through aggressive bond purchases, has begun reducing its involvement, contributing to market volatility.
Investors highlight the historical challenges of trading JGBs, which have often been dubbed the “widow-maker” trade. Previous attempts by hedge funds and other investors to short Japanese bonds—betting on rising yields—resulted in significant losses during periods when the BoJ held yields artificially low. Now, some market participants warn that going long on JGBs could become similarly risky if inflation pressures persist and the BoJ delays tightening monetary policy.
Some asset managers, including Allianz Global Investors and Carmignac, have started acquiring small positions in longer-dated bonds, such as 20- and 30-year maturities, but remain cautious. They cite uncertainties around volatile energy prices, government fiscal discipline, and the potential for policy shifts as reasons to limit exposure. Investors also point to the government’s debt burden, which stands at roughly 200 percent of GDP, as a key risk factor in an environment of rising yields.
Domestic institutional investor support is seen as a critical factor for the JGB market’s stability. Japan’s Government Pension Investment Fund (GPIF), the world’s largest retirement fund managing roughly $1.8 trillion, is closely watched for possible changes in its domestic asset allocation. Analysts estimate that if the GPIF increases its domestic bond holdings to its maximum threshold of 31 percent, it could inject an additional ¥12 trillion ($75 billion) into the market. Some strategists view the GPIF’s moves as a signal that other investors, including foreign accounts, might follow.
However, commentators caution that the GPIF has historically operated independently with strict investment principles, explicitly avoiding actions aimed at influencing markets or government policy. This independence tempers expectations of a significant shift in its asset allocation before the next scheduled review in 2030.
Recent JGB auctions have shown relatively strong demand, which some market participants interpret as evidence of renewed interest from major real-money investors, including those overseas. Yet, many international fund managers maintain below-benchmark allocations, citing ongoing uncertainty about fiscal sustainability and concerns over potential government influence on the BoJ’s independence.
Overall, the market remains divided between those encouraged by higher yields and potential domestic support, and those wary of structural fiscal challenges and geopolitical factors. Until there are clear changes in fiscal policy or monetary strategy to address Japan’s long-term debt dynamics, many investors are expected to adopt a cautious approach to Japanese government bonds.