Long-term borrowing costs across some of the world's biggest economies hit fresh highs because of concerns over inflation, government debt levels and spending on artificial intelligence, according to the BBC. The interest rate on US borrowing over 30 years hit 5.33% on Tuesday — the highest since June 2007 — while UK long-term debt reached 5.85%. Similar moves were recorded in Germany and Japan.
Bond yields and consumer borrowing costs
Interest rates on bonds — a type of debt — are known as yields and can directly affect the borrowing costs consumers pay on mortgages, car loans and credit cards, the BBC reported. Rising oil prices are the main driver behind the recent surge in bond yields, as investors fear inflation could spike again. If that happens, central banks may choose to raise interest rates to cool inflation.
Oil prices and Middle East tension
On Tuesday, a barrel of Brent crude — the global benchmark for oil prices — surpassed $90 following growing tensions over the conflict in the Middle East. The recent surge came after President Donald Trump threatened to bomb Oman, a US ally, if it "gets in the way" of talks with Iran to reopen the Strait of Hormuz waterway, according to the BBC. The US and Oman have each been negotiating separately with the Iranian government to reopen the key passage, vital for global oil supply and other trade.
The strait has been largely closed for almost six months due to the US-Israel war with Iran, causing oil supply disruption and leading to higher prices. Elevated oil prices can lead to price rises across the board as companies pass higher expenses to consumers, pushing up inflation. Oil is a key factor in business, the BBC noted, as goods are often transported by lorry or van.
Analyst: inflation risk, debt and AI spending drive yields
John Canavan, lead analyst at Oxford Economics, told the BBC the inflation risk from higher oil prices, along with high levels of government debt and uncertainty around the vast sums being invested into AI — and when that will pay off — were all playing a part in higher borrowing costs. He cited:
- Higher oil prices and inflation risk
- High levels of government debt
- Uncertainty over AI investment timing and pay-off
He added that the trend could lead to higher mortgage rates and borrowing costs for car loans for consumers. Higher yields, he warned, would mean companies could have to pay more to borrow money and might pass that on to customers.
"It adds to the overall inflationary impact," he said, adding that in the longer-term the risk was higher inflation could slow economic growth.
Bond investors typically demand higher returns — or yields — if inflation is high or they expect it to be elevated in the future. Governments and corporations sell bonds — essentially an IOU — to raise money for spending and in return pay interest.
| Key metric | Value | Context |
|---|---|---|
| US 30-year borrowing cost | 5.33% | Highest since June 2007 |
| UK long-term borrowing cost | 5.85% | — |
| Brent crude | Above $90 per barrel | Surpassed on Tuesday |
Government borrowing and fiscal rules
As well as inflation fears, Canavan said there had been a "push back" across the world from bond investors over the broad financial policies and spending plans of a number of governments. The UK's financial position and levels of borrowing has led Prime Minister Andy Burnham to assure bond markets that he is committed to sticking to the government's existing borrowing limits, known as its fiscal rules.
Borrowing costs edged up when Burnham took over the Labour leadership from Sir Keir Starmer this summer, the BBC reported. Prior to commitments on the fiscal rules, investors had considered that Burnham would be more likely to increase Britain's already high public borrowing, especially following his comments last year that the UK had to "get beyond this thing of being in hock to the bond markets".
Corporate borrowing and AI investment
Canavan said long-term borrowing costs in the US were also being driven by a "record pace" of corporate borrowing in recent weeks, mostly for the development and build-out of AI and data centers. With uncertainty over the hundreds of billions of dollars being ploughed into AI, as well as the potential risks, investors are demanding higher returns on lending. Canavan also said the yields were troubling people because they portend a tighter environment, according to the BBC.
For executives and investors, the implications are direct: higher yields raise the cost of corporate debt, may lift mortgage and consumer loan rates, and could feed through to prices across the economy. The combination of oil-driven inflation, heavy government borrowing and record corporate debt issuance for AI infrastructure means central banks may face renewed pressure to act.
