UK Fiscal Headroom Shrinks to £11 Billion Risking Deficit

The UK's fiscal headroom has halved to just £11.3 billion, according to a new report from EY. The figure is based on a baseline forecast that assumes the Strait of Hormuz will reopen by late 2026, though with reduced tanker traffic. However, under EY's adverse scenario, where the strait remains closed until mid-2027 and UK inflation spikes to 6% by the end of 2026, headroom could shrink by another £18 billion, turning the surplus into a £7 billion deficit.

Peter Arnold, EY UK Chief Economist, emphasized the precarious nature of the UK's public finances, noting that £11 billion is only about 1% of total tax receipts. 'On margins this fine, relatively modest shifts in growth, inflation or gilt yields can move the fiscal position by billions,' he said. A prolonged Middle East conflict could wipe out the headroom entirely, putting the government at risk of missing its fiscal rule.

The erosion of headroom since March is driven by a weaker economy and heightened global uncertainty. Rising gilt yields, elevated inflation, and rising unemployment have all contributed to the decline. In the adverse scenario, falling equity prices would further reduce tax receipts, while weaker growth and higher unemployment would increase borrowing and welfare spending.

EY's analysis also highlights limited revenue-raising options for the upcoming Autumn Budget. With manifesto commitments ruling out rate hikes on the four largest taxes, accounting for 70% of tax receipts, the Chancellor has few options left to raise significant funds. A limited budget could be funded without breaking these pledges, but more ambitious spending plans would require tapping into protected taxes.