UK Borrowing Surges to £18.3bn in August, Complicating Autumn Budget Plans

UK government borrowing rose sharply to £18.3bn in August, surpassing market expectations and highlighting the difficult fiscal landscape facing the Chancellor ahead of the October budget statement.

Ruth Gregory, deputy chief UK economist at Capital Economics, described the current public finance situation as a “dismal picture.” Speaking to clients, she indicated that the elevated borrowing figures support the view that the upcoming budget will likely be modest in scale rather than ambitious.

Gregory suggested that many of the Prime Minister’s policy objectives may be delayed or scaled back to avoid triggering significant tax increases or adverse market reactions. She projected that total borrowing for the 2026/27 financial year would reach approximately £125bn, or 3.9% of GDP, exceeding the Office for Budget Responsibility’s forecast of £115bn.

According to the consultancy, the Chancellor is expected to need between £9bn and £14bn in additional measures during the budget to restore existing fiscal headroom. Rising debt servicing costs are absorbing a larger portion of government revenues, leaving public finances more vulnerable to future economic shocks.

Although better-than-expected monthly borrowing data could provide some relief, it would not fully offset the pressure caused by higher government borrowing costs. Thirty-year gilt yields recently hit their highest levels since 1998, increasing the expense of long-term financing at a time when fiscal space is already narrow.

Gregory noted that while higher gilt yields do not immediately impact debt interest costs, they make it more difficult for improvements in monthly borrowing figures to translate into lasting fiscal flexibility. Consequently, the government is relying not only on improved borrowing data but also on some easing in borrowing costs to achieve its budgetary goals.