UK public sector net borrowing reached £18.3 billion in August, above the £15.5 billion consensus and £3.5 billion more than the OBR forecast, lifting the April-August deficit to £77.3 billion — £8.1 billion past official projections. Sterling traded near 1.3370, close to a six-week low, as gilt futures fell 20 ticks before recovering.
Britain's August budget shortfall came in £2.8 billion above the highest forecast in a Reuters poll, pushing the fiscal-year deficit £8.1 billion past the Office for Budget Responsibility's projection and sending sterling to its weakest level in about six weeks.
"Medium-term borrowing prospects look far more challenging than in March," said Matt Swannell, chief economic adviser to the ITEM Club, a consultancy. "The rise in gilt yields since the OBR's Spring forecast has halved Healey's fiscal wiggle room, leaving just over £10 billion of headroom against the government's primary fiscal rules."
Public sector net borrowing excluding public sector banks reached £18.3 billion in August, the Office for National Statistics said Tuesday, against a £15.5 billion consensus and £15.4 billion a year earlier — a 19 percent increase. It was the second-highest August on record, behind 2020. The ONS revised borrowing higher for each of the previous four months of the 2026/27 fiscal year, lifting the April-August cumulative deficit to £77.3 billion. That is £2.2 billion below the same point in 2025/26 but £8.1 billion above the OBR's forecast. Borrowing for the full 2025/26 year was revised up by £4.5 billion to £134.3 billion.
The current budget deficit — the gap between day-to-day spending and tax revenue that the government must close by 2029/30 — stood at £51.9 billion for the year to date, against an OBR forecast of £47.1 billion. Central government debt interest reached £8.8 billion in August, the highest for that month since records began, inflated by RPI-linked gilts as inflation lifts the coupon on index-linked bonds. Total spending rose £6.7 billion year-on-year to £117.2 billion, with central government outlays up £4.9 billion to £103.1 billion on goods, services and inflation-linked welfare. Receipts rose £3.7 billion to £99.0 billion, led by income-related taxes. Public sector net debt was 93.8 percent of GDP at end-August, down 1.3 percentage points from a year earlier.
Gilt futures fell 20 ticks on the release before recovering, with cash-market yields edging higher at the open. Sterling traded near 1.3370 against the dollar, close to a six-week low, as broad dollar strength compounded the move. The pound's slide matters beyond FX desks: a weaker currency raises imported inflation, which feeds directly into the Bank of England's rate calculus at a moment when debt servicing costs are already consuming budget room. The last time gilt yields repriced this sharply against a fiscal forecast, in the autumn of 2022, the 30-year yield spiked above 5 percent and the pound touched a record low of 1.0350, forcing an emergency Bank of England bond-buying intervention.
Chancellor John Healey presents his first budget on October 28, and investors are watching how he squares his fiscal-rule pledges with a spending base that inflation keeps pushing higher. Chief Secretary to the Treasury Emma Reynolds reiterated that the government is committed to meeting its fiscal rules "with a buffer against uncertainty" — a buffer that stood above £24 billion in March and has since been cut by rising yields. The OBR's own March projections assumed headroom that the April-August outturn has already eroded by roughly a third.
The arithmetic leaves Healey three levers, none of them comfortable. He can raise taxes beyond the main rates, cut real spending growth, or accept a smaller buffer and the higher gilt yields that come with it. Each path carries a market price. A credible consolidation plan on October 28 would likely compress the risk premium now embedded in gilts and steady the pound; a budget that leans on accounting adjustments rather than durable measures would push the 10-year yield higher and extend sterling's decline. The Bank of England's next rate decision, and the inflation prints before it, will determine whether the currency's weakness is read as a growth signal or a fiscal one.
This article is for informational purposes only and does not constitute investment advice.
