The Japanese bond market is under unprecedented strain, with yields on long-term government bonds reaching levels not seen in decades.

This turmoil is raising alarms about a potential global financial contagion that could affect yields, currencies, and credit systems worldwide.

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According to reports, the 30-year Japanese government bond yield surpassed 4% for the first time since its creation in 1999, approaching 4.2% in May 2026.

Meanwhile, the 10-year bond yield is hovering near highs last recorded in the late 1990s.

Global Ripple Effects

The stress in Japan's bond market is not an isolated event.

Analysts warn that it could trigger a chain reaction across global financial markets, particularly in the United States.

Japan is the largest foreign holder of US Treasury bonds, and any large-scale selling by Japanese investors could push US yields higher.

Data shows that Japanese investors sold nearly $29.6 billion in US debt during the first quarter of 2026, the largest quarterly sell-off since 2022.

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This trend is already putting upward pressure on US Treasury yields, with the 30-year US bond reaching 5% recently.

Analyst Catalina Castro highlighted the potential domino effect: Japan sells American bonds, pushing US yields higher, which in turn raises mortgage rates and credit costs, straining the entire US financial system.

She noted that the stress on Japanese bonds is becoming stress on American bonds.

Unwinding of the Yen Carry Trade

The underlying cause of this market shift is the unwinding of the so-called "yen carry trade."

For decades, Japan's ultra-low interest rates allowed investors to borrow cheap yen to invest in higher-yielding assets abroad.

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However, recent rate hikes by the Bank of Japan are dismantling that global flow.

As the carry trade unwinds, Japanese investors are repatriating funds, selling foreign assets including US Treasuries.

This is contributing to the rise in Japanese bond yields and adding to global market volatility.

The international financial system relies heavily on nostro and vostro accounts for cross-border transactions.

Banks currently keep large amounts of funds prefunded in foreign currencies for these operations, immobilizing capital that could otherwise circulate in the real economy.

The situation has intensified concerns about rising government and corporate financing costs globally, increasing financial pressure on mortgages, credit, and risk assets.

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The historic stress in Japan's bond market is being closely watched by policymakers and investors worldwide.