Britain’s public finances have deteriorated sharply ahead of the autumn Budget, with official figures showing borrowing running materially above the forecast used by the Office for Budget Responsibility. The figures intensify pressure on Chancellor John Healey as he seeks to preserve fiscal credibility while funding public services and responding to higher debt costs.

Public sector borrowing reached £18.3bn in August, according to the Office for National Statistics, making it the second-highest figure recorded for that month and £3.5bn above expectations. Debt interest payments rose to £8.8bn, the highest August total on record, as inflation-linked government bonds and elevated borrowing costs increased the burden on the Exchequer.

A narrowing path to the Budget

The latest data suggest the government’s deficit is accumulating faster than expected. Borrowing between April and August reached £77.3bn, around £8.1bn above the OBR’s forecast for the period.

The overshoot comes at a politically sensitive moment. Higher interest costs reduce the money available for departmental spending and make it more difficult for the Treasury to meet its fiscal rules without tax increases, spending restraint or a combination of both.

Inflation has been a key driver of the deterioration. The cost of servicing index-linked debt rises when prices increase, while higher inflation can also push up welfare and other government spending. The result is a squeeze on the Chancellor’s room for manoeuvre before the autumn statement.

Markets watch the government’s response

Investors are likely to scrutinise the government’s response closely, particularly as gilt yields remain elevated. A sharp rise in borrowing costs would further increase the expense of refinancing public debt and could undermine confidence in the government’s fiscal plans.

Treasury officials have stressed their commitment to fiscal discipline, while acknowledging the uncertainty surrounding the economic outlook. The latest figures nevertheless make the Budget arithmetic more challenging and raise the prospect of difficult decisions on taxation and public spending.

Wider business implications

For businesses, tighter public finances could mean weaker demand if the government opts for spending restraint, alongside potential tax changes affecting employers, households or investment. Companies are also contending with slowing private-sector growth and renewed cost pressures.

S&P Global’s latest survey indicated that UK private-sector activity had slowed to a three-month low, with a composite purchasing managers’ index reading of 51.7 in September, down from 52.5 in August. Rising energy and fuel prices were cited as intensifying input-cost inflation and discouraging hiring.

The combination of sluggish growth, higher financing costs and an expanding fiscal deficit leaves the government with limited easy options. The Budget will need to convince markets that borrowing can be brought under control without placing excessive pressure on an economy already showing signs of weakness.