Rates Strategy Weekly: Decoupling of Terminal Rate and Neutral Rate in Japan

Mizuho analyzes the changing yield curve dynamics in Japan as BOJ terminal rate pricing nears the neutral rate ceiling, leading to potential curve bear-flattening. The authors project the 10y JGB yield will peak near 3% and decline in 2027, maintaining long 20y ASW and forward cross-market spread positions.

Key Takeaways

• 1.Japan is approaching an inflection point where long- and super-long-term forward rates decouple from medium-term rate hikes, shifting curve dynamics toward bear flattening rather than continued steepening.
• 2.Market pricing of a BOJ terminal rate of 2% or higher is excessive relative to Japan's lower potential growth rate and estimated neutral rate range of 1.1% to 2.5%, implying yields will decline into 2027.
• 3.Japanese authorities have very limited flexible technical options (such as bond buybacks or issuance revisions) compared to US authorities to curb rising JGB yields, especially following coordinated FX intervention.

Table of Contents

• (1) Decoupling of terminal rate and neutral rate may alter yield curve dynamics
• LIKELY YIELD CURVE DEVELOPMENTS UNDER TWO PATHS FOR MONETARY POLICY
• DEVELOPMENTS THIS WEEK AND IMPLICATIONS FOR RATES OUTLOOK
• SHORT-TERM OUTLOOK (ONE WEEK – ONE MONTH)
• MEDIUM-TERM OUTLOOK (SEVERAL MONTHS – ONE YEAR)
• Risk scenarios
• (2) As US authorities increase bond buybacks, what options are available to Japanese authorities?
• (3) Yen rates relative value and investment strategies
• INVESTMENT STRATEGIES
• RELATIVE VALUE SCORE TABLES

Report data

Chart 1.4. Expected yield curve changes under each scenario — as of August 20, 2026.

Reports in this series

Rates Strategy Weekly is shown in chronological order through this edition, published on August 24, 2026.

Part of the Rates Strategy Weekly series — view all 15 editions

Looking for the latest edition? JGB Strategy | Strategy Weekly (Aug 31, 2026)

1. May 25JGB Strategy
2. Jun 1JGB Strategy
3. Jun 2JGB Strategy
4. Jun 8JGB Strategy
5. Jun 9Mizuho Fixed Income Japan Rates Strategy Weekly "Ueda’s speech and BOJ-related reports
6. Jun 10Mizuho Fixed Income Rates Strategy Weekly Japan Ueda’s speech and BOJ-related reports
7. Jun 15JGB Strategy
8. Jun 22Mizuho Fixed Income Japan Rates Strategy Weekly "June MPM gives no need to revise market expectations
9. Jun 29JGB Strategy
10. Jul 6JGB Strategy
11. Jul 13JGB Strategy
12. Aug 10JGB Strategy aug 10
13. Aug 17JGB Strategy

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