Sumitomo Mitsui DS Asset Management
Published
15/09/2026
Read time 5 minutes
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Highlights:
  • Japan’s long-term interest rates have climbed sharply over recent weeks,  reflecting a combination of Bank of Japan (BOJ) rate hikes, fiscal concerns, and inflation risks linked to higher crude oil prices.
  • We expect the BOJ policy rate to reach 1.75% by June 2027, a scenario that appears largely reflected in current market pricing today.
  • Despite this, upward pressure on long-term yields remains due to elevated energy prices and fiscal concerns, underscoring the need for a credible government commitment to fiscal discipline

 

Why Japan’s long-term rates are rising so quickly

As the BOJ announced its latest rate hike on September 18, the yield on the benchmark 10-year Japanese government bond (JGB) briefly rose to 2.945%, surpassing the 2.930% level reached the previous day.This marked the highest level in roughly 30 years, since September 1996, and reminded global audiences that a fundamental macro regime change is now well-underway in Japan, the significance of which needs to be underlined. Selling pressure also spread across super-long-term JGBs, including 20-, 30-, and 40-year maturities.

Several factors appear to be driving the increase: the BOJ’s now entrenched shift toward policy tightening, concerns about fiscal deterioration under expansionary government policies, and fears of rising inflation linked to higher crude oil prices amid worsening Middle East tensions. Rising U.S. Treasury yields, influenced by fiscal concerns, increased war-related spending, and large-scale debt issuance, have also contributed to upward pressure on yields globally, with Japan being no exception.

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