UK Inflation Set to Peak at 3.75% as OBR Forecasts Growth Slowdown in Budget Report

The Quick Take

• The Office for Budget Responsibility forecast UK inflation rising to a peak of around 3.75% by early 2027
• Inflation is expected to surge beyond earlier forecasts, complicating the Bank of England's rate-cutting cycle
• The UK economy faces a simultaneous growth slowdown, creating classic stagflationary pressure on policy options

The OBR's revised inflation forecast — peaking at 3.75% versus prior expectations — marks a significant upside surprise in the context of the Bank of England's carefully managed rate-cutting cycle. Published as part of the UK Budget document, the forecast carries official credibility that market-derived measures including breakevens and swaps will immediately re-price against. A 3.75% inflation peak materially constrains the BoE's ability to deliver the two or three rate cuts that UK money markets had priced for 2027. The simultaneous growth slowdown creates the most difficult possible monetary policy environment: inflation too high to cut aggressively, growth too weak to sustain the current restrictive stance.

UK equities face a bifurcated impact: domestically-oriented consumer discretionary and retail sectors suffer from higher-for-longer rates compressing household disposable income while the growth slowdown suppresses top-line demand. FTSE 100 multinationals with predominantly overseas revenues including HSBC, BP, Shell, and Unilever are relatively insulated, benefiting from sterling weakness that amplifies non-GBP earnings translation. UK gilts face the sharpest re-pricing: a 3.75% inflation peak coinciding with a government running a larger-than-expected deficit means higher long-end yields are almost inevitable. Global bond funds with UK duration exposure face mark-to-market losses as the gilt curve steepens from these dual pressures.

The critical forward signals are the November Bank of England Monetary Policy Committee meeting — where the Inflation Report update will reveal whether the MPC internalizes the OBR's revised path — and the three-month rolling CPI prints from November 2026 through January 2027 validating or contradicting the 3.75% peak. The macro variable determining stagflation severity is energy prices: if natural gas costs remain elevated through the winter heating season, energy-driven CPI components stay sticky and compound the challenge. Watch UK wage growth data as well: if nominal wages fail to moderate alongside inflation, service-sector inflation becomes self-sustaining and pushes the BoE toward a hold rather than a cut.

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