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Japan’s main bank industry group warns of rising bond yield risks
The Japanese Bankers Association says surging government bond yields could force writedowns and erode profits, even as banks post record earnings
Japan’s banking sector is having a strange year. Record profits and existential anxiety, delivered in the same quarterly earnings report.
The Japanese Bankers Association issued a warning on September 17 that rising government bond yields may trigger writedowns and realized losses across the industry, cutting into the very profits that have made Japanese megabanks the envy of their global peers.
Record profits meet record-high yields
JBA chairman Masahiko Kato flagged a scenario that sounds counterintuitive at first: the same rising interest rates that have been fattening bank margins are now threatening to blow holes in their bond portfolios.
The 10-year Japanese government bond yield has climbed to 3%, a level not seen in three decades. The culprits are familiar: growing fiscal concerns about Japan’s towering government debt and expectations that the Bank of Japan will keep hiking its policy rate, which is projected to reach roughly 1.25% by mid-September 2026.
Japan’s three largest megabanks, Mitsubishi UFJ Financial Group, Sumitomo Mitsui Financial Group, and Mizuho Financial Group, reported a combined net income of approximately ¥5.26 trillion for the fiscal year ending March 2026. That’s a 34% jump year-over-year, driven primarily by wider lending margins as interest rates rose.
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The unrealized loss problem
Banks hold enormous portfolios of government bonds, and bond prices move inversely to yields. When yields rise, the market value of existing bonds falls. Japanese banks have been managing this reality by holding bonds to maturity, a strategy that avoids booking losses on paper as actual hits to the income statement.
If yields keep climbing, the gap between what banks paid for those bonds and what they’re currently worth keeps widening. At some point, accounting rules or liquidity needs could force banks to sell at a loss or take impairment charges.
Kato’s message was clear: banks will be reluctant to rebuild their JGB holdings until they have better visibility on where yields are headed and where the BOJ’s policy rate will peak.
Japan’s Financial Services Agency, the country’s top banking regulator, is monitoring the situation. FSA Commissioner Yutaka Ito stated that aggregate paper losses across the banking sector remain at a manageable level for now.