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Energy prices and bond yields are complicating the budget math

The biggest challenge facing the Treasury ahead of the UK budget is how long the global energy squeeze linked to the war in Iran will last, and how markets will react. The chancellor enters her first budget on Oct. 28 facing a two-way squeeze, with both inflation and borrowing costs being pushed higher.

In the first weeks in office, oil prices had fallen to as low as $75 a barrel, while the yield on 10-year government bonds stood at 4.9%. Just over two months later, oil was mostly trading above $100, and the 10-year yield had climbed to about 5.4%.

That makes the budget forecasts more fragile. Even though there is talk of a possible easing in the Iran war after the U.S. midterm elections on Nov. 3, London cannot rely on that outcome when the budget is unveiled on Oct. 28.

Two options stand out for the Treasury

The first is to plan for a prolonged conflict and make permanent, difficult decisions on taxes and spending. The second is to assume the energy shock may be temporary, create more room for borrowing and buy time.

One figure drawing attention is the £24 billion in fiscal headroom left from the period of former Chancellor Rachel Reeves. The report says part of that buffer may be used, and that while higher inflation is raising interest costs, it is also lifting cash tax revenues because tax brackets have been frozen.

What does the recovery in consumer confidence mean?

Helped by the government's more upbeat economic message, the UK’s longest-running consumer confidence survey has risen to its highest level in two years. Confidence among young people is also said to have reached its strongest level since before Brexit.

Business sentiment remains more cautious, but there have been some signs of improvement in recent months. Still, expectations of possible tax increases continue to cloud the outlook for companies.

IMF pressure and productivity debate loom as market stress continues

Pressure on governments in global bond markets is rising, especially as major artificial intelligence companies compete with sovereign borrowing for investor capital. Combined with Britain’s recent political and economic uncertainty, that leaves the Treasury with less room for error.

Kristalina Georgieva, the IMF managing director, has warned advanced economies not to delay debt reduction and fiscal consolidation. Meanwhile, fresh debate over UK productivity data could also affect the budget calculations. As the Office for National Statistics (ONS) updates productivity performance upward, it remains unclear how much of that will feed into the forecasts of the Office for Budget Responsibility (OBR).

Possible budget priorities

  • Financing the defense investment plan
  • Meeting the target of extra defense spending rising toward 3% of GDP
  • Finding funding for a new social care system
  • Pre-spending measures to support youth employment

In the end, the question facing London is clear: will it opt for tough austerity measures against what may only be a temporary energy and geopolitical shock, or accept market pressure and take a more flexible line in the budget? The decision is expected to be crucial for both sterling assets and the domestic demand outlook.

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