The UK government is facing a substantial fiscal challenge as inflation continues to rise, creating a projected £24 billion shortfall in public spending by the end of this decade, according to forecasts from the National Institute of Economic and Social Research (NIESR). This development places considerable pressure on Prime Minister Andy Burnham and Chancellor John Healey as they prepare for the autumn Budget, with difficult decisions anticipated on how to balance commitments with fiscal constraints.

NIESR’s latest analysis attributes the upward inflationary pressures partly to the ongoing conflict between the United States and Iran, which has contributed to higher oil prices exceeding $100 a barrel. The institute projects inflation will peak around 3.7 to 3.8 percent early next year and remain above the Bank of England’s 2 percent target well beyond 2029. This inflation outlook is considerably more persistent and elevated than previously expected, eroding the real value of government spending over time.

As a result, the real-terms value of public spending will be approximately 4 percent lower by 2029-30 compared to earlier forecasts, equivalent to the £24 billion gap cited by NIESR. This gap emerges despite the government’s commitments to increased defence spending, alleviating the cost of living, and measures such as energy bill reductions and business rate cuts. Economists have noted that at least £1 billion of the planned rise in defence expenditure remains unfunded.

NIESR has emphasized that the government has limited capacity to address this shortfall through further borrowing, warning that additional debt could exacerbate the country’s already high borrowing costs—the highest among the G7 nations. Instead, the think tank advises that the gap must be closed through either spending cuts or tax increases. David Aikman, director of NIESR, stressed the importance of funding all commitments via taxation or savings elsewhere to maintain current debt levels.

The institute also recommended various fiscal options, including reforms to taxes and welfare spending, updating council tax valuations, and reconsidering the pension triple lock. Deputy director Stephen Millard suggested targeting tax reform to increase revenue without raising marginal tax rates. Millard also indicated a possible case for the Bank of England to increase interest rates to guard against further inflationary shocks stemming from volatile energy prices.

The government has taken initial steps to offset costs by, for example, scrapping a planned digital ID scheme to finance a VAT cut on energy bills. However, concerns remain about the sustainability of other spending commitments. Business Secretary Jonathan Reynolds highlighted the government’s focus on encouraging private investment across sectors, underscoring the need to improve economic resilience and growth outside London and the southeast—key elements of Burnham’s broader economic agenda.

Economic forecasters have painted a cautious outlook for growth, with the UK’s GDP expected to slow to around 1.1 percent this year and next, below the long-term average. Some forecasts have been even more pessimistic, suggesting growth could fall below 1 percent if geopolitical instability persists. With inflation’s persistence and fiscal constraints, policymakers face a complex trade-off between supporting public services and maintaining economic stability in the years ahead.