Chancellor Faces $100 Oil and 5.4% Yields Before 28 October Budget

Oil has traded largely above $100 a barrel and the 10-year gilt yield sits at around 5.4% — up from $75 and 4.9% when the chancellor took office. The numbers frame the two big calls he must make before his inaugural Budget on 28 October: how long the economic pressures from the Iran War will last, and how to sustain a modest but notable uptick in economic spirits through further global turbulence.

Defence Secretary John Healey acknowledged the strain when asked whether there had been too much doom-mongering. "It's tough," he told the BBC's Faisal Islam earlier this month. "Conflicts, uncertainty, driving up inflation, driving up interest rates. But we've got great strengths. We've got good reasons to be confident about the future of Britain."

A shock that could reverse

This energy shock is unusual. It could quickly reverse, as it did earlier in the summer, when assumptions about a de-escalation in the US–Iran conflict drove sharp falls in energy prices and yields.

In New York this week, both President Trump and President Pezeshkian linked November's US midterm elections to when the war might end. Trump told the UN General Assembly the Iranians would wait until after the vote to seek peace, because the war's impact on living costs — particularly soaring diesel prices — could damage him electorally. The Iranian president said his nation "didn't want it to get to the midterms".

The 3 November vote falls six days after the Budget. No one can rely on a settlement by then, but it is plausible. The chancellor's tax, spend and borrowing forecasts could therefore be based on a prolonged conflict that is on the cusp of ending — or already over.

He must decide whether to plan for the worst and make painful permanent tax and spending decisions, or buy time. One option: let borrowing take the strain by tolerating a reduction in the £24bn of headroom — room for manoeuvre against self-imposed borrowing rules — left by his predecessor, Rachel Reeves. This year's headroom will be judged in three years rather than four, giving some rationale for a smaller number against a closer target. Higher inflation means higher interest costs, but it also lifts cash tax receipts while thresholds remain frozen.

Keeping the vibes going

The second question is whether the optimism strategy of the Burnham administration has traction. The longest-running UK consumer confidence survey has hit a two-year high; among younger people it has not been this high since before Brexit. Some data companies call it a "Burnham bounce", though the weather and the World Cup also played a part.

Evidence on business optimism is more mixed. The Institute of Directors said any improvement came despite, rather than because of, the new government, clouded by anticipation of possible tax rises. The turnaround still contrasts with the admitted mistake of the Starmer government in talking up consumer pain two years ago.

The chancellor must reconcile better spirits with the need for a "challenging" Budget. A key question is how much of the summer bond market shock stems solely from the Iran war and how much is structural. Governments now face intense competition in bond markets from the world's biggest AI businesses, and the UK has had recent political and economic uncertainty of its own.

"At times like this you don't want to be at the back of the herd," said one very senior former Treasury adviser, describing bond markets as a pack of wolves stalking red deer.

The Treasury points to the UK recording the highest growth and fastest falling borrowing of major G7 countries this year, and to overall energy prices decoupling from high and volatile gas prices. IMF chief Kristalina Georgieva dismissed the idea that advanced nations could pause fiscal consolidation while the Gulf situation calmed. "Bring debt levels down, make fiscal consolidation as a priority… it is impossible to stress strongly enough how critical it is to get the courage to take the steps that are necessary," she said, while acknowledging the UK's "fairly consistent, credible" plans.

The productivity puzzle

The Office for National Statistics has materially upgraded the UK's productivity record — though because of fewer hours worked — raising an argument to reverse the OBR's downgrade of last year, which dealt a notable hit to the public finances. The new OBR chair, Jonathan Haskel, argues official statistics understate investment in intangibles like software and data, and his latest research suggests AI-related investment is already visible in US productivity figures. Such factors seem unlikely to enter the OBR's calculations next month, but the debate is real.

Officially, the Budget must still identify cuts to fund the Defence Investment Plan inherited from Sir Keir — before funding the move to 3% of GDP and a new social care system. Even promised welfare savings look to be built on upfront investment in jobs for young people.

One change from last year: the government has parked the pre-Budget "pitch-rolling" with Trappist silence, instead timing announcements such as the "Your First Home" scheme to coincide with Labour party conference. Expect plenty more as 28 October nears.