Government borrowing costs across the US, UK, Japan, Germany and France are at or near multi-decade highs, driven by inflation worries, rate-hike bets and swelling government debt. Oil prices, a hawkish Fed speech and a surge in AI-related corporate borrowing are adding to the pressure, pushing up mortgage rates and government interest bills alike.
Government borrowing costs from the United States to Germany and Japan are sitting at or near multi-decade peaks. Japan's 10-year bond yield hit 3% on Tuesday for the first time since 1996. Britain's 30-year borrowing costs are at 30-year highs, while German and French 10-year yields sit at levels last seen in 2011 and 2008 respectively. Elevated yields could squeeze households and companies alike, as well as exacerbate government finances.
Oil and a hawkish Fed add fuel
A renewed rise in oil prices tied to U.S.-Iran tensions is pushing yields higher, since elevated inflation leaves traders bracing for more rate hikes. That comes on top of concerns over rising borrowing: the U.S. debt pile just crossed $40 trillion, and debt as a share of economic output sits at or above 100% across the G7, Germany aside. A hawkish speech by Federal Reserve Chair Kevin Warsh at the Jackson Hole symposium has also fed traders' rate-hike bets.
Mortgages and government interest bills climb
Bond yields set the tone for borrowing costs across the economy, from government debt to mortgages, student loans and car loans, so rising rates can slow growth. U.S. 30-year mortgage rates have risen to a one-year high of nearly 6.7% as Treasury yields have climbed. In Britain, higher yields mean a bigger bill for rolling over debt: the country's fiscal watchdog said in March that its interest bill of almost 4% of output is now roughly double its pre-pandemic decade average and eclipses the defence budget.
AI borrowing binge adds to the pressure
A surge in bond sales to fund AI investment is another factor pushing yields up; analysts point to supply and demand, since heavier borrowing demand lets lenders charge higher rates. Alphabet, Amazon, Meta, Microsoft and Oracle have issued $220 billion of debt so far this year to fund data centres and models, more than double last year's total, according to LSEG data. That borrowing has helped push global corporate bond issuance to a record $4.9 trillion so far in 2026, up 14% from this point a year ago.
What policymakers can do
The U.S. Treasury has announced bond buybacks that analysts say are aimed at limiting rising borrowing costs; that initially helped stabilise the market, but long-dated yields have since crept back up. Treasury Secretary Scott Bessent says worries about rising debt and yields overlook the strength of the U.S. economy. Central banks can also buy bonds if markets are stressed, as the Bank of England did during the 2022 UK mini-budget crisis, while the European Central Bank holds similar powers under its Transmission Protection Instrument.
Many investors say the current rise in yields is orderly and reflects higher borrowing and inflation. But absent concerted steps by governments to cut debt or boost growth, so-called bond vigilantes — investors demanding higher compensation to hold government debt they see as poorly managed — will stay on alert.
Source: Economy News (Investing.com)
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