30-Year Treasury Yield Hits 5.33% as Global Debt Fears Mount

Global sovereign bond markets face their most severe selloff in decades, with long-dated yields across the US, Europe, and Japan at multi-year highs.

The 30-year US Treasury yield climbed to 5.33% this week, its highest since 2007, as fiscal expansion, AI debt issuance, and a retreat of traditional bond buyers push long-term borrowing costs to multi-decade highs.

"The market is telling us we expect higher inflation in the future, or at least more uncertainty, so we demand higher yields for holding long-dated bonds," said Justin Onuekwusi, chief investment officer at St. James's Place.

France's 30-year yield reached its highest since 2008, Germany's 30-year Bund hit 3.78% — the steepest in 15 years — and the UK's 30-year gilt approached 6%. Japan's 30-year yield rose to its highest since 1999. Bloomberg data shows the average yield on investment-grade sovereign bond benchmarks has climbed to about 4.5%, the highest since records began in 2015.

The surge carries direct fiscal consequences. US interest payments have reached $1.17 trillion this fiscal year, up 15 percent year-over-year, while the national debt approaches $40 trillion. For the Trump administration, rising borrowing costs are becoming a political liability ahead of midterm elections.

The selloff is not a single-market event but a global structural shift. Skylar Montgomery Koning, a macro strategist at Bloomberg, noted that deficit expansion is occurring while the economy remains relatively strong — a departure from the typical pattern where fiscal expansion coincides with economic weakness and lower policy rates.

"Normally, deficit expansion accompanies economic softening, with policy rates falling to cushion the bond market," Koning said. "But this pro-cyclical fiscal expansion means governments are borrowing more at a time when rates are already elevated, pushing yields higher."

Supply Pressures Intensify as AI Debt Floods Market

US annual fiscal deficits have reached about $2 trillion, and ongoing government bond issuance to cover the shortfall is pressuring long-end markets. Meanwhile, big tech companies are flooding the corporate bond market to fund AI infrastructure. Barclays forecasts US investment-grade corporate bond issuance will reach a record $1.9 trillion this year, up from $1.44 trillion in 2025. Hyperscalers have issued a combined $159 billion of bonds in 2026, up 47 percent from a year earlier, with Goldman Sachs projecting total issuance of $400 billion this year. Alphabet's recent decision to issue A$5 billion (US$3.6 billion) in the Australian bond market — its first such offering — illustrates the scale of AI-related borrowing.

On the demand side, traditional long-dated bond buyers are systematically retreating. Central banks and pension funds — historically price-insensitive holders — are being replaced by private investors who demand higher compensation for duration risk. Anshul Pradhan, head of US rates strategy at Barclays, estimates this buyer-base shift has added about 90 basis points to the 30-year Treasury term premium over the past decade.

The Iran conflict has compounded the pressure. Brent crude is trading above $90 a barrel, reviving concerns that energy costs could rekindle inflation. Mohit Kumar, chief European economist at Jefferies, said long-term yields have recently moved in tandem with oil prices. "When the price of oil rises above $90, inflation concerns become the dominant factor," he said. Yet inflation expectations remain relatively contained — five-year and ten-year breakevens sit at 2.25 percent and 2.28 percent, respectively. The yield surge is driven primarily by real yields, meaning investors are demanding more compensation for holding long-dated debt beyond inflation.

Rising Yields Reshape Market Calculus

The rise in long-term yields is weighing on equities, particularly technology and AI stocks where future earnings expectations are heavily discounted in share prices. The iShares 20+ Year Treasury Bond ETF (TLT) fell to an all-time low of $81.35 on Monday. Gold, however, has gained 10 percent this month, suggesting some investors view the bond selloff as a loss of confidence in sovereign fiscal credibility.

JPMorgan Asset Management portfolio manager Kelsey Berro sees opportunity in the repricing. "We think value is more on the long end, especially in real yields," she said. AXA's Chris Iggo is more cautious: "It's hard to know what yield level would genuinely improve the total return outlook for long-duration fixed income. The only thing that could change this is a sudden deterioration in economic data, or some external shock — and the latter seems more likely than the former."

For governments, the window for locking in ultra-low long-term funding has closed. The UK has paused most of its planned long-dated gilt issuance, and other countries are shifting toward shorter maturities. S&P Global Ratings projects Italy will refinance maturing obligations equal to 17 percent of its GDP in 2026, versus 12 percent for France and 7 percent for both Germany and the UK.

This article is for informational purposes only and does not constitute investment advice.