Rising global energy costs driven by the US-Israel war in Iran are shrinking the UK government's financial buffer. Chancellor John Healey faces a tight Budget where higher inflation will reduce funds available for public services. He must choose between raising taxes, cutting spending, or a combination of both.

The Institute for Fiscal Studies warned against building the Budget on unrealistic future reductions. Director Helen Miller said that pencilling in implicit cuts would make the plan a work of fiction. The think tank stressed that inherited spending targets will leave many departments falling behind inflation without immediate adjustments.

Healey addressed markets ahead of the annual International Monetary Fund meeting. He stated that "The consequences of conflict in the Middle East and Europe are hitting countries worldwide, leading to higher prices at the pumps and more expensive mortgages at home." He emphasized that strict fiscal discipline will deliver economic resilience and offer temporary breathing space for households.

The IFS estimates that bond market volatility and rising inflation will add around £10bn to government borrowing costs for 2029-30. This reduces the expected financial headroom to around £20bn, compared to the £24bn forecast during the Spring Statement. Maintaining current department budgets would require an extra £25bn in 2029-30, a shortfall that would likely demand significant tax increases.

Healey can delay major spending choices until next year's Spring Statement or Spending Review. The government aims to meet its fiscal rules by limiting borrowing to investment projects and cutting debt as a percentage of GDP. Markets appear steady despite the tighter margins.