Why Super-Long-Term Japanese Government Bonds May Not Be Worth the Risk

Rising Japanese government bond yields are drawing attention to 20-, 30-, and 40-year issues, but longer maturity does not automatically mean a better return. This explanation lays out three reasons to be cautious about super-long-term JGBs and suggests an alternative asset class for long-term investors.

■ Why super-long-term bonds carry risk
- Interest rate sensitivity: bond prices and rates move in opposite ways, and longer maturities amplify price swings that can erase years of coupon income
- Holding period: although par value is returned at maturity, unrealized losses must be evaluated at market price and may force a sale below principal
- Inflation exposure: fixed interest payments do not rise with prices, which erodes real returns over time

■ Alternative approach
- Stocks compared with high-risk bonds for investors with a long time horizon and tolerance for significant risk

This content is aimed at individual investors considering JGBs as rates climb. Viewers can learn a framework for weighing coupon yield against price risk, inflation, and holding period before committing to long-duration bonds.