The International Monetary Fund has made the sharpest downward revision to economic growth for any Group of Seven economy, cutting its projection for Britain in 2026 to 0.8% from a prior estimate of 1.3%. The Fund attributed the weaker outlook to the inflationary shock from the U.S.-Israeli war with Iran, which initially doubled the price of natural gas on which Britain is heavily reliant, and to subsequent slower-than-expected cuts in Bank of England interest rates.
The downgrade leaves Britain level with Germany on the IMF's growth forecast for 2026 and slightly below France, but at the bottom of the G7 on a per capita basis. The Fund warned that its global growth projections could be revised down again if the conflict continues.
Finance minister Rachel Reeves, who had been scheduled to arrive in Washington for the Fund's Spring Meetings, criticized what she characterized as the United States' lack of a clear exit plan from the conflict in Iran. She said she was "very frustrated and angry" and called the absence of defined objectives "a folly," adding that it was affecting families in the UK as well as internationally.
Those economic headwinds are expected to impede the government's pledge - articulated by Prime Minister Keir Starmer and Reeves - to accelerate the economy and raise living standards. The IMF now forecasts Britain's unemployment rate will increase to 5.6% this year, up from 4.9% in 2025.
The Conservative Party pointed to the scale of the IMF downgrade and the projected rise in unemployment as evidence of damage stemming from Reeves' policy choices, including a recent increase in tax on employers.
Business sentiment also reflects strain: a survey published on Monday found confidence among large British companies at its lowest level since the start of the COVID-19 pandemic, while public expectations for inflation have surged.
On the price front, the IMF said Britain's inflation rate is likely to peak at around 4% and average 3.2% across 2026 before easing back toward the Bank of England's 2% target only by the end of 2027. By contrast, in its previous full forecasts the Fund had expected inflation to fall to 2.5% in 2026.
Although the IMF expects growth to rebound to 1.3% in 2027, that number still reflects a 0.2 percentage-point downgrade from earlier forecasts. The Fund noted similar themes in projections from the Organisation for Economic Co-operation and Development, which also lowered Britain's 2026 growth prospects more than for any other major economy and flagged faster-than-expected inflation.
Facing the higher energy cost burden, Reeves has said she will outline measures this week to assist businesses struggling with energy bills and has previously indicated the government is considering targeted support for low-income households.
IMF Chief Economist Pierre-Olivier Gourinchas cautioned that Reeves confronts a "delicate exercise" in balancing near-term support measures with pressure on public finances. "When you look at volatility in the gilt markets, it’s very, very clear the market is very sensitive to fiscal news in the UK," Gourinchas said, referring to a jump in UK government borrowing costs since the start of the war.
The Fund singled out two intertwined channels driving the downgrade: the initial surge in gas prices following the conflict and the resulting need for a more cautious schedule of Bank of England interest rate reductions. That combination, the IMF argued, broadens inflationary pressures and curtails the near-term recovery.
Policymakers and markets will be watching the government's forthcoming support plans closely for signs of targeted relief versus broader fiscal commitments, and how those decisions feed through to gilt market volatility and borrowing costs.
Context and implications
The IMF revision crystallizes how an external geopolitical shock - in this instance the Iran-related escalation - can propagate through commodity markets into domestic inflation, monetary policy paths and fiscal trade-offs. For Britain, which was already grappling with relatively high inflation among G7 peers for much of the past four years, the result is a more constrained policy space to deliver the economic acceleration promised to voters.
Looking ahead, much hinges on the trajectory of the conflict and the responsiveness of energy markets. The Fund's warning that global growth forecasts could be trimmed further if the war persists highlights the open-ended nature of the risk and the potential for sustained pressure on inflation and financial markets.