Britain is facing the sharpest growth downgrade of any major advanced economy this year after the OECD’s latest outlook cut the UK’s 2026 growth forecast to 0.7%. The organisation also raised its inflation forecast for Britain to 4.0%, marking the largest upward revision among the G7.
The scale of the downgrade places the UK near the bottom of the G7 growth table, ahead of Italy alone, while leaving it with the second-highest inflation rate in the group behind the United States. For ministers and businesses alike, the forecast underlines how exposed the British economy remains to external energy shocks.
The OECD said “planned fiscal tightening” and higher energy prices would “keep growth subdued” in the UK. It also noted that the impact of the latest energy crunch would be felt differently across economies depending on whether they are net energy importers or exporters. For Britain, that means a conflict-driven rise in oil and gas costs is feeding directly into a weaker growth outlook at the same time as inflation pressure intensifies.
Rachel Reeves, responding to the forecast, said Labour had put Britain “in a better position to protect the country’s finances and family finances from global instability”. The new projections suggest that claim will be tested over the coming months as the Treasury balances fiscal restraint against pressure on households and businesses.
For companies already navigating higher borrowing costs and softer demand, the concern is less about one forecast revision in isolation than the cumulative effect of slower activity and stickier prices. That mix has immediate consequences for investment decisions, hiring, and access to working capital, particularly among smaller businesses.
Alex Fenton, partner at FBX Capital, said: “UK firms are being squeezed from all sides, and the situation is rapidly worsening. More and more businesses are now turning to lenders out of necessity, not choice, seeking capital simply to stay afloat rather than to invest, grow, or innovate.
“This is the reality of lower growth colliding with higher inflation: a toxic mix that will drag down investment and erode confidence across the economy, hitting SMEs, the backbone of the UK economy, hardest.
“Without urgent, targeted government action to ease cost pressures, the UK risks falling even further behind.”
The warning lands against a broader backdrop of rising business costs and weakening confidence. Recent UK survey data has already pointed to slower activity growth and faster input price inflation as energy and transport costs rise. The OECD’s update sharpens that picture, turning a period of uncertainty into a more explicit downgrade for Britain’s near-term outlook.
For now, the OECD has left the UK’s 2027 growth forecast at 1.3%, while expecting inflation to remain above the Bank of England’s 2% target at 2.6% next year. That leaves policymakers with limited room to manoeuvre, and businesses with little expectation of a quick return to calmer conditions.
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