Global Bond Markets Face Selloff as Government Borrowing Costs Hit Multi-Decade Peaks

Government borrowing costs from the United States to Germany and Japan are at or near multi-decade peaks, driven by heightened worries about inflation, rising interest rates, and nagging anxiety over sovereign debt loads. Elevated bond yields threaten to squeeze households and companies while exacerbating government finances.

In Japan, the 10-year bond yield hit 3% for the first time since 1996, marking a significant milestone for an economy emerging from an era of ultra-low rates. Meanwhile, Britain’s 30-year borrowing costs remain near 30-year highs, and German and French 10-year yields have touched levels last seen in 2011 and 2008, respectively. U.S. 10-year Treasury yields also rose to their highest point since mid-2023 at around 4.80%.

A renewed rise in oil prices, fueled by U.S.-Iran tensions, is pushing yields higher as persistent inflation leaves traders braced for additional rate hikes. This compounds existing concerns over rising borrowing, with the U.S. debt pile having crossed $40 trillion and debt-as-a-share of economic output sitting at or above 100% across all G7 nations except Germany. A hawkish speech by U.S. Federal Reserve Chair Kevin Warsh at the Jackson Hole symposium has further reinforced trader expectations for rate increases.

The broader economic impact of these rising yields is evident in everyday borrowing. U.S. 30-year mortgage rates have climbed to a one-year high of nearly 6.7%. Governments are also facing severely increased costs to roll over debt. Britain’s interest bill of nearly 4% of output is now roughly double its pre-pandemic decade average, according to its fiscal watchdog, and currently eclipses the national defense budget.

Beyond sovereign debt, a significant factor pushing up bond yields is a surge in corporate bond sales to fund artificial intelligence investments. According to LSEG data, five of the biggest AI hyperscalers—Alphabet, Amazon, Meta, Microsoft, and Oracle—have issued $220 billion in debt this year, more than double last year's total, to fund investments in data centres and models. This activity has helped push global corporate bond issuance to a record $4.9 trillion in 2026, marking a 14% increase from the same point a year ago.

While the U.S. Treasury has announced bond buybacks aimed at limiting rising borrowing costs, and central banks retain emergency tools like the Bank of England's intervention or the European Central Bank's Transmission Protection Instrument, market analysts note that yields will likely remain elevated. Many investors observe that the current rise is orderly, reflecting higher borrowing and inflation, and that longer-term borrowing costs will only decrease durably if governments take concerted steps to bring down debt or boost growth.

"The current pressures in global bond markets carry significant implications for the broader macroeconomic environment, particularly for businesses and capital allocation. When sovereign and corporate borrowing costs rise simultaneously—driven in part by massive infrastructure outlays in emerging sectors like artificial intelligence—access to capital becomes more expensive across the board. Founders and business leaders must closely monitor these shifting debt dynamics, as tighter financial conditions and higher interest rates inevitably influence private market liquidity, valuations, and overall economic growth." — Dr. Shishir Gupta, Founder & CEO, StartupLanes