Interest rate risk management has long been a key issue for Japanese life insurers due to the long-duration nature of insurance liabilities and the challenges of matching them with available long-duration assets in the domestic market. In some cases, the effective duration of liabilities can extend 20 to 30 years. As a result, the economic value of insurer balance sheets is highly sensitive to changes in interest rates.
In this white paper, we review publicly disclosed derivative positions of 41 Japanese life insurance companies and provide observations on how interest rate derivatives are used in practice. Our review also highlights the important role of Japanese generally accepted accounting principles in shaping hedging behavior. We also discuss practical considerations for managing long-duration Japanese yen liabilities, including liquidity management, collateral requirements, basis risk, and operational infrastructure. As the Japanese interest rate environment continues to evolve, insurers may increasingly evaluate a broader range of hedging instruments, organizational structures, and risk management frameworks to manage long-duration interest rate exposure more effectively.
Key findings:
- Interest rate swaps remain the dominant hedging instrument both in terms of notional exposure and frequency of use.
- The use of other derivatives—such as bond futures, bond forwards, and swaptions—is more selective, and typically reflects specific hedging objectives or accounting considerations.
- Insurers have increasingly used receive-floating, pay-fixed interest rate swaps in the rising rate environment to reduce duration exposure without realizing losses on underlying bond portfolios.
- In recent years, offshore reinsurance solutions have become increasingly relevant as some insurers seek additional flexibility in managing interest rate risk under more economic-value-based frameworks.