Japan's 30-Year Bond Prices at 3.888% - The New Normal for Ultra-Long YieldsA · FULL TRANSLATION
- The 90th 30-year JGB carried a 3.7% coupon with a highest accepted yield of 3.888%
- Bids totaled 1.32 trillion yen against 450.8 billion yen accepted
- Elevated ultra-long yields reflect inflation and fiscal supply, pressuring fixed mortgage rates
Remember 3.888% - the price markets now charge Japan's government to borrow for 30 years. The June 10 auction of the 90th 30-year JGB drew a 3.7% coupon, a top accepted yield of 3.888% and an average of 3.860%. Ultra-long yields are the deep-water temperature of Japanese finance: they price insurers' liabilities, pension discount rates and fixed mortgages like Flat 35. At 3.8%, the market has fully priced in persistent inflation, continued BOJ normalization and unrelenting bond supply - against barely 1% three years ago. For borrowers, fixed-rate mortgages have become markedly costlier, tilting the fixed-versus-floating choice. For insurers and pensions, higher yields finally repair investment income. For the yen, the same number reads two ways: rate support, or fiscal risk premium. The bid-to-cover at the next ultra-long auction will tell us which script the market chose.
The Ministry of Finance conducted the auction for the 90th issue of 30-year fixed-coupon JGBs on June 10. The bond carries a 3.7% coupon, with issuance on June 11, 2026 and maturity in March 2056. In the competitive auction, bids totaled 1,323.7 billion yen against an accepted amount of 450.8 billion yen; the lowest accepted price was 97.40 yen (highest accepted yield 3.888%) and the average price 97.78 yen (average yield 3.860%). A further 148.9 billion yen was allotted in non-competitive bidding, with a second non-competitive round for primary dealers held the same afternoon at the average price.