UK gilt yields have hit their highest level since the financial crisis, dragged up by a worldwide bond sell-off sparked by rising oil prices and renewed conflict between the United States and Iran. The surge leaves Chancellor John Healey facing a potential £6bn reduction in his fiscal headroom, according to Panmure Liberum economist Simon French.
UK gilt yields financial crisis comparison: how far they have moved
The benchmark 10-year gilt yield rose by as much as 15 basis points in early Tuesday trading, reaching an 18-year high of about 5.2 per cent. Longer-dated 30-year gilt yields climbed further still, to 5.9 per cent. The moves were sharper for the UK than for the US, Japan or Germany, reflecting what traders regard as elevated inflation risk tied to trade disruption across the Middle East.
Data from Wealth Briefing shows the scale of the shift across the UK yield curve: 2-year yields have risen from 3.52 per cent to 4.17 per cent, 5-year yields from 3.68 per cent to 4.35 per cent, and 10-year yields from 4.23 per cent to 4.80 per cent. That broad-based repricing points to markets reassessing the medium and long-term interest rate path, not just reacting to a short-term shock.
The selloff was not confined to the UK. According to Global Banking and Finance Review, the US 30-year Treasury yield rose to about 5.32 per cent, its highest level in nearly 20 years, as the same pressures reverberated through global fixed-income markets.
Oil prices and the Iran conflict driving the sell-off
Kathleen Brooks, research director at XTB, said the jump in bond yields across the world was a direct consequence of higher oil prices. The Brent crude benchmark hit $91 per barrel as tensions between the US and Iran escalated over the weekend with fresh missile exchanges. That figure has since climbed further: according to the UK Parliament Commons Library, Brent crude rose above $100 per barrel in March 2026, compounding inflationary pressure on an economy where the Bank of England’s base rate already stood at 3.75 per cent at that point.
Brooks said some market analysts believed the resumption of hostilities would be ‘short lived’, but acknowledged real risks of prolonged disruption. ‘We are now just two months away from the US mid-term elections, and President Trump shows no sign of scaling back the war in Iran to win votes, even though the conflict is not popular at home,’ she said. ‘This could trigger volatility in the coming weeks, as investors fret that elevated oil prices could be here to stay.’
Headroom under pressure and the Bank of England’s response
The fiscal consequences are direct. Simon French said the rise in 20-year gilt yields could hit Healey’s headroom by as much as £6bn. That headroom, set by fiscal rules requiring day-to-day spending to be matched by tax receipts by 2030, stood at about £22.7bn based on projections drawn up before the Iran conflict. The Office for Budget Responsibility’s debt interest forecasts already project the UK government paying lenders up to £137bn in 2030; a sustained rise in yields would push that figure higher still.
Economists have pointed to the Bank of England’s quantitative tightening (QT) programme as one lever available to ease the pressure. Oxford Economics adviser Michael Saunders said the Bank could slow the pace of QT from £70bn in the current year to £50bn to ‘limit upward pressure on gilt yields’, and could focus the programme on reducing interest rate risk on its own balance sheet. The Bank has maintained that QT has had only a small impact on market pricing, though that position has drawn criticism from politicians including Chancellor of the Duchy of Lancaster Louise Haigh and Reform UK’s Richard Tice, both of whom have argued the sell-off has cost taxpayers billions.
Whether the Bank’s Monetary Policy Committee moves to hike rates later this year remains an open question among City economists, with many waiting to see how the US-Iran situation develops before making a call.
The housing market is also in the frame. Capital Economics warned that higher borrowing costs would weigh on commercial property values. RSM UK economist Thomas Pugh said a drop in mortgage approvals in July could signal the start of a difficult period, describing the ‘combination of higher borrowing costs and lower disposable income’ as ‘a toxic mixture for the housing market’. The next set of OBR forecasts will show how much of that pressure has been baked into the official numbers.
