Japanese life insurance is the last large pool of capital still being punished by a monetary regime that ended today. The industry wrote enormous volumes of endowment and whole life policies in the late 1980s and early 1990s at guaranteed yields near 3 percent, and then spent a quarter century reinvesting maturing assets at well under 1 percent. That gap, the negative spread, has been a permanent tax on investment margin. It is the single reason Japanese lifers have traded at a fraction of the multiples their Western peers command. With the policy rate now at its highest level since 1995 and the curve holding a positive slope out to 30 years, new money finally goes to work at or above the average guaranteed rate on the legacy book. The tax does not shrink, it inverts.
The second link is the one the market has not priced, because it is new. Japan's solvency regime changed: from fiscal 2025 insurers are capitalised on an economic value basis (ESR), which discounts liabilities at market rates rather than carrying them at book. Japanese lifers run a structurally negative duration gap: their liabilities are longer than their assets, even after two decades of buying super-long JGBs to close it. Under an economic value framework that mismatch is no longer an abstraction. When long discount rates hold higher, the present value of those very long liabilities falls faster than the value of the shorter asset book, and reported ESR mechanically rises. Higher yields, which look like a loss under old accounting through unrealised bond marks, are a capital gain under the regime that now actually binds.