⚠ Japan Life's Underwater BondsModerate threat

Tokio Marine Holdings (8766) — threat to the moat

Tokio Marine's life company sits on nearly a trillion yen of paper losses on its bonds.

Tokio Marine's Japanese life company holds long-dated bonds to match its long-dated policies. As Japanese interest rates rose, their market value fell: under Japanese GAAP, the unrealized loss on held-to-maturity bonds was ¥590.5 billion at March 2025 and ¥914.6 billion at March 20261.

Unrealized loss on held-to-maturity bonds (¥ bn, March)590.52025914.62026Japanese GAAP; Tokio Marine results, year to March 2026
Up by a third of a trillion yen in a year.

Under Japanese GAAP those losses sit outside profit as long as the bonds are held. Under IFRS, which the company now uses, the Japan Life segment reported a net loss of ¥204.9 billion in the latest year, including investment losses of ¥237.6 billion2, around the block reinsurance of part of its book.

The company's own sensitivity shows the exposure: a 10 basis point rise in yen interest rates reduces the life business's net assets by about ¥5.0 billion3.

Rising rates are good for new life business, which can invest at higher yields. They are bad for the value of the old bonds. The losses are real if the bonds are ever sold before maturity.

Under IFRS the contractual service margin, the unearned profit on existing life policies, rose by ¥31.8 billion to ¥1,149.7 billion in the latest year4. The business is still adding future profit even as the value of its old bonds falls.

The number that tests this threat is the unrealized loss. Growth beyond ¥914.6 billion would show rates still rising faster than the company can adjust.

The number that tests this threat
Reported
Unrealized loss on held-to-maturity bonds, March 2026
¥914.6bn against ¥590.5bn a year earlier

The cost of rising yen rates to the life business's bond book.

Source: Tokio Marine Japanese GAAP results, year to March 2026 ↗
References
  1. ReportedAs Japanese interest rates rose, their market value fell: under Japanese GAAP, the unrealized loss on held-to-maturity bonds was ¥590.5 billion at March 2025 and ¥914.6 billion at March 2026.
    Tokio Marine Holdings, Consolidated Financial Results (Japanese GAAP) for the fiscal year ended March 31, 2026 - ordinary income, net income, segment profit, dividends, cash flows and securities. — FY to March 2026 · publ. 20 May 2026 · source ↗
  2. ReportedUnder IFRS, which the company now uses, the Japan Life segment reported a net loss of ¥204.9 billion in the latest year, including investment losses of ¥237.6 billion, around the block reinsurance of part of its book.
    Tokio Marine Holdings, Consolidated Financial Results (IFRS) for the fiscal year ended March 31, 2026 - insurance revenue, net income, segment results, the Japan Life investment loss, acquisitions, the NICO share disposal and the buybacks. — FY to March 2026 · publ. 26 June 2026 · source ↗
  3. ReportedThe company's own sensitivity shows the exposure: a 10 basis point rise in yen interest rates reduces the life business's net assets by about ¥5.0 billion.
    Tokio Marine Holdings, FY2025 results and FY2026 projections presentation - Japan P&C results: premiums, auto, natural catastrophes and expense ratios. — FY to March 2026 · publ. May 2026 · source ↗
  4. ReportedUnder IFRS the contractual service margin, the unearned profit on existing life policies, rose by ¥31.8 billion to ¥1,149.7 billion in the latest year.
    Tokio Marine Holdings, Consolidated Financial Results (IFRS) for the fiscal year ended March 31, 2026 - insurance revenue, net income, segment results, the Japan Life investment loss, acquisitions, the NICO share disposal and the buybacks. — FY to March 2026 · publ. 26 June 2026 · source ↗
Sources
Generated September 24, 2026