Two upcoming Japanese government bond auctions are expected to pose a significant threat to US Treasury yields. The auctions for 20-year and 30-year Japanese government bonds (JGBs) are drawing attention due to the recent surge in Japanese yields, with the benchmark 10-year yield approaching 3% for the first time in three decades. This increased competitiveness in JGBs makes them more attractive to Japanese investors, who have traditionally been major purchasers of US debt.
This situation is exacerbated by recent trends where Japanese bond holdings of US debt have declined. Analysts like Charu Chanana, chief investment strategist at Saxo Bank, noted the fall in Japan's US bond holdings in June and stated that while Japan isn't abandoning Treasuries, Washington can no longer assume foreign demand will absorb additional supply at previous yields. This shift in investor preference could lead to reduced demand for US Treasuries, potentially pushing their yields even higher.
The context for these concerns includes a broader environment of rising long-term borrowing costs globally. US 30-year bond yields recently hit their highest levels since 2007, and 10-year Treasury yields, at around 4.74%, are trading at levels that have historically garnered attention from US officials. Concerns about persistent inflation, expanding government debt, and competition from large AI-related borrowing have contributed to this pressure. Treasury Secretary Scott Bessent's recent attempts to curb these rising yields through increased bond buybacks, such as doubling long-end buybacks to at least $4 billion per operation, have provided only temporary relief.
While the US Treasury's bond buyback strategy initially led to a fall in global yields, the effect has been short-lived, with US yields subsequently rising again. Some market participants interpret the buybacks as an unsettling signal regarding underlying debt concerns. If the Japanese auctions are successful and further solidify the attractiveness of JGBs, it could intensify the challenges faced by the US Treasury in managing its borrowing costs and finding sufficient demand for its debt, especially as US 10-year Treasury yields hover near levels that have historically prompted official intervention.
