UK Borrowing Surges to £18.3bn, Adding Pressure on October Budget

Published: September 22, 2026, 9:50 am

Government borrowing in the UK saw an unexpected surge during August, reaching £18.3bn, according to the Office for National Statistics (ONS). This figure is nearly one-fifth higher than the same period last year and sits £3.5bn above what official forecasters had anticipated. The rise in borrowing, defined as the gap between tax receipts and government spending, coincides with a period of heightened economic pressure as Chancellor John Healey prepares to deliver his inaugural Budget at the end of October.

Inflation climbed to its highest rate in five months throughout August, largely fueled by increasing petrol and diesel prices. Although tax receipts were higher in August compared with a year ago, spending on public services, benefits, and other costs grew more as the pace of price rises increased. Notably, the interest paid on national debt reached £8.8bn in August, marking the highest level for that month since records began in 1997.

Martin Beck, chief economist at WPI Strategy, noted that while it is important to avoid overinterpreting data from a single month due to inherent volatility, there are nonetheless concerning elements present. Beck warned that interest costs are expected to rise further, which will inevitably lead to increased borrowing. He added that the government typically relies on the Office for Budget Responsibility's (OBR) medium-term fiscal forecast, but while the figures were an "unwelcome setback", Beck said the government tends to look at the OBR's medium-term fiscal forecast – so what it expects for the public finances three years into the future.

"But even there, the chancellor's got problems," he said. "The cost of that interest has gone up. That's going to feed through into more borrowing."

Research economist Nick Ridpath echoed these concerns, stating that both elevated inflation and higher borrowing costs complicate the Chancellor's dual goals of reducing borrowing and increasing spending on government priorities. Approximately one-quarter of the interest paid on UK public debt is tied to the Retail Prices Index, an inflation measure that typically trends higher than the Consumer Prices Index.

Ruth Gregory, deputy chief UK economist at Capital Economics, described the situation as a dismal backdrop for the autumn Budget. She suggested that these figures increase the likelihood that Prime Minister Andy Burnham’s policy ambitions may need to be delayed or scaled back to prevent significant tax hikes or negative market reactions. Furthermore, she warned that with the economy weakening, the government will likely continue to borrow more than expected.

In response, Emma Reynolds, Chief Secretary to the Treasury, emphasized that the UK possesses huge potential for growth but requires fiscal discipline. She noted that debt interest costs billions of pounds that could otherwise be utilized for public services. Conservative shadow chancellor Andrew Griffith, however, criticized the government, claiming it had lost control of public finances by overshooting OBR forecasts.

He asserted that only the Conservatives would make the necessary choices regarding welfare and public spending to stabilize Britain’s finances. Economists currently estimate that the Chancellor may need to find £15bn, potentially through tax increases, to meet the government’s self-imposed spending rules.

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