UK August Borrowing Overshoots Forecasts Ahead of the Budget
The UK government borrowed £18.3bn in August 2026, according to Office for National Statistics figures released on September 22, 2026. The Guardian
Public sector net borrowing, the gap between public spending and income, was £2.9bn higher than in August 2025. It was £3.5bn higher than the forecast from the Office for Budget Responsibility, the independent forecaster for the public finances.
The result was also above private-sector expectations. City analysts had forecast £15.6bn for the month. Borrowing overshot that consensus by £2.7bn.
The overshoot extends a run of higher-than-expected monthly deficits. In July 2026, the government ran a £1.8bn deficit when analysts had expected zero. In June 2026, public sector borrowing was £16.0bn. ONS
On a financial year-to-date basis, the deficit reached £77.3bn at the end of August 2026. That is £8.1bn above the OBR forecast for this point in the fiscal year.
Earlier cumulative data pointed in the same direction. Borrowing from April to July 2026 totalled £56.7bn. BBC Over those four months, borrowing was £2.3bn more than the OBR forecast published in March. House of Lords Library Borrowing in the financial year to July stood at 1.8% of gross domestic product, the total value of goods and services produced in the economy. ONS
The ONS defines borrowing as the difference between total public sector spending and income. The measure captures central government, local government and public corporations on a net basis, after receipts.
John Healey was chancellor on September 22, 2026, preparing for a budget the next month. The August figures are therefore the last full monthly read on the public finances before that fiscal event.
Looking at what this means for policymakers and market watchers, the pattern matters more than any single month. Two consecutive overshoots against both official and market forecasts reduce confidence that the fiscal path is converging toward the OBR baseline. The question is less whether August was noisy and more whether the forecast error is persistent. Persistent errors tend to compound in year-to-date totals, and that is visible in the £8.1bn gap by August.
In my view, the context to weigh is optionality. A chancellor entering a budget with borrowing already above forecast has less room to accommodate weaker receipts or higher debt interest without adjusting tax or spending plans. The prior months also suggest the pressure is not isolated. July and August both came in above expectations, and the April to July cumulative total was already above the March OBR profile. That sequence narrows the scope for treating August as an outlier.
The broader context here is institutional. OBR forecasts anchor fiscal accountability in the UK system, and repeated deviations invite scrutiny of the underlying assumptions on spending, receipts and growth. For investors in gilts, or government bonds, and for departments planning expenditure, the practical issue is revision risk. If the OBR revises its borrowing trajectory at the budget, the policy arithmetic around headroom, the margin for manoeuvre against fiscal rules, will have to be recalculated from a higher starting point.
