OBR Warns UK Inflation Set to Peak Near 3.75% as Growth Forecast Cut in Budget Statement

The Quick Take

• The Office for Budget Responsibility forecast UK inflation peaking at around 3.75% early next year, exceeding prior forecasts
• The UK economy faces simultaneous inflationary pressure and a growth slowdown, complicating Bank of England policy decisions
• The OBR's dual warning signals stagflationary risk for the UK — a historically difficult environment for both monetary and fiscal policy

The UK's Office for Budget Responsibility has issued a stark forecast update warning that inflation is set to peak near 3.75% at the start of next year, materially above prior projections, even as economic growth is simultaneously expected to slow. The combination represents a stagflationary signal for the UK — rising prices alongside decelerating output — which presents the Bank of England with its most challenging policy environment since the post-pandemic inflation surge of 2022-2023. The OBR's assessment, typically released alongside a government budget or fiscal update, carries institutional authority and will directly influence market expectations for the Bank of England's rate path.

For UK financial markets, a 3.75% inflation peak alongside slowing growth creates a difficult environment across asset classes. UK gilts face pressure from inflation-driven rate expectations, with the Bank of England likely to maintain or tighten policy even as growth weakens — a dynamic that pushes up yields and compresses duration-sensitive portfolios. UK equities, particularly consumer-facing sectors like retail, hospitality, and property, face margin pressure from both higher input costs and demand-weakening real wage erosion. The pound sterling faces two-way pressure: higher rates support the currency, but deteriorating growth fundamentals limit upside. London-listed multinationals with dollar earnings benefit from any sterling weakness.

Track the Bank of England's next Monetary Policy Committee meeting outcome as the immediate policy signal: any indication of further tightening beyond current levels would confirm that the BoE is prepared to fight the inflation peak at the cost of near-term growth. The macro variable that determines whether the OBR's stagflation warning materializes into a deeper economic drag is UK wage growth — if nominal wages continue rising faster than the inflation trajectory, the squeeze on real household incomes moderates and the growth slowdown remains shallow. Conversely, if energy price pass-through from the Middle East conflict feeds into utility bills and retail petrol prices simultaneously, the 3.75% inflation peak could prove optimistic.

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