Global bond yields surge, piling debt burden on governments, businesses and households

Government bond yields surged sharply around the world Tuesday (local time), driving up borrowing costs for governments, businesses and households alike. Government bond yields serve as a benchmark in financial markets, setting the price of other assets and the cost of raising funds. When yields rise, the ripple effects can push up everything from the interest burden on sovereign debt to mortgage rates and corporate financing costs.

Yields on benchmark government bonds in the United States and other major economies soared to multi-year highs that day. The US 10-year Treasury yield climbed to its highest level since January 2025, while Japan's 10-year yield briefly touched 3 percent during trading for the first time since 1996. The UK's 30-year gilt yield reached its highest point since 1998, and Germany's 10-year yield hit its highest level since 2011.

A Bloomberg global government bond yield index rose for four consecutive sessions through Tuesday, reaching 3.72 percent — its highest reading since mid-2008.

Rising government bond yields translate directly into higher borrowing costs for the private sector. Long-term yields in particular serve as a reference rate for long-term financing such as mortgages and corporate bonds.

For households, higher rates mean greater costs for buying homes or servicing existing loans, leaving less room for consumer spending. Businesses face similar pressure on investment and expansion plans.

Governments carrying large debt loads stand to be hit hardest. Each time existing bonds mature, they must refinance at higher rates, meaning interest costs can compound steadily over time.

The United States' total national debt surpassed $40 trillion last month even as its fiscal deficit continues to widen. Japan, too, carries a massive government debt load exceeding twice its GDP, making it especially vulnerable to rising interest costs as yields climb.

The bond selloff that has persisted for several weeks reflects a confluence of factors. A resumption of military hostilities between the United States and Iran has rekindled inflation fears, with tensions around the Strait of Hormuz stoking concerns about oil supply disruptions. The November futures price for Brent crude, the international benchmark, topped $94 a barrel that day.

Widening fiscal deficits and growing sovereign bond issuance across major economies have added to the pressure. Corporate bond issuance has also picked up as companies seek to fund AI infrastructure investment, swelling demand for capital within fixed-income markets and adding further upward pressure on government yields.

Analysts note that in the United States, unlike in Europe, much of the rise in long-term yields has been driven by higher real interest rates — the return bond investors demand after accounting for inflation, and a gauge of the true cost of borrowing for governments and businesses.

"In Europe and the UK, rising inflation expectations are a bigger driver, whereas in the US, the rise in long-term rates is still being led by higher real rates," said Frances Cheung, head of foreign exchange and rates strategy at OCBC.

Rising Japanese bond yields have introduced a new variable into global financial markets. After decades of ultra-low interest rates, higher yields in Japan are increasing the likelihood that Japanese investors will favor domestic assets over foreign bonds — a shift that could exert additional upward pressure on bond yields in the United States, Australia and other markets worldwide.

"This is a genuine regime change," said Prashant Newnaha, senior rates strategist at TD Securities. "Japanese government bonds served as an anchor for global bonds for a long time, but now the situation has reversed."

With inflation concerns mounting, markets are closely watching central banks' next moves.

Federal Reserve Chair Kevin Warsh signaled at the recent Jackson Hole conference that the Fed could take further action if inflation fails to slow toward its 2 percent target.

Markets are now pricing in a significant probability that the Fed will raise its benchmark interest rate at the September FOMC meeting.

Higher bond yields could weigh on equity markets. Stocks where lofty growth expectations are already baked into valuations — AI-related companies in particular — are especially vulnerable to a correction, which could in turn trigger broader risk aversion across markets. Some on Wall Street have begun to ask whether a selloff in AI stocks could mark the beginning of a broader bubble burst.

"We have already entered the danger zone," said Derek Halpenny, head of research for global markets in Europe at MUFG, adding that the higher rates climb, the greater the risk of a sharp downturn in equity markets.