Global borrowing costs hit fresh highs on oil, AI and inflation
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- The US 30-year Treasury yield climbed to 5.33% on Tuesday — its highest level since June 2007 — while UK long-term debt reached 5.85%, with similar moves in Germany and Japan.
- Brent crude breached $90/barrel Tuesday after President Trump's threat to bomb Oman if it interferes with US-Iran talks to reopen the Strait of Hormuz, which has been largely closed for nearly six months due to the US-Israel war with Iran.
- Oxford Economics lead analyst John Canavan pinned the yield surge on a combination of oil-driven inflation risk, elevated government debt levels, and uncertainty over the "vast sums" being invested in AI and when they will pay off.
- US corporate borrowing has run at a "record pace" in recent weeks, mostly funding AI and data center build-outs, adding further upward pressure on long-dated yields, Bokeh Capital Partners' Kim Forrest said.
- UK Prime Minister Andy Burnham moved to reassure bond markets he would honor existing fiscal rules after borrowing costs edged up when he replaced Sir Keir Starmer as Labour leader this summer.
- Capital Economics named the US, UK, France, Italy, and Japan as seeing the largest rises in long-term borrowing costs, citing "unsustainable fiscal positions," geopolitical and inflation uncertainty.
Why it matters: Higher 30-year yields — 5.33% in the US, 5.85% in the UK — feed directly into pricier mortgages, auto loans, and credit cards for consumers. With Brent above $90 on Iran-Hormuz supply fears and record AI-data-center borrowing piling on, bond investors are demanding compensation across multiple risks simultaneously — a mix Canavan warned could slow growth by reigniting inflation.
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