Iran war will hit UK growth the hardest of any rich economies, IMF says

• UK's 2026 growth forecast of 0.8% is the lowest among G7 nations, trailing the US (2.3%), Spain (2.1%), euro area (1.1%), and France (0.9%)
• The IMF cautioned that a protracted conflict could further worsen the economic outlook, compounded by growing public debt and eroding institutional credibility
• The fund emphasized that 'fostering adaptability, maintaining credible policy frameworks, and reinforcing international cooperation' are essential to navigate the current shock

Summary: IMF Warns UK Faces Worst Growth Hit from Iran War Among Advanced Economies

The International Monetary Fund (IMF) warned Tuesday that the United Kingdom will experience the steepest growth decline among G7 nations due to the ongoing Iran conflict. According to the IMF's latest World Economic Outlook, UK growth projections for 2026 have been slashed to just 0.8%, down from the 1.3% forecast for 2025.

Key Comparisons:

The UK faces the largest downward revision among major economies and will significantly lag peers in 2026:

• United States: 2.3% growth
• Spain: 2.1%
• Eurozone: 1.1%
• France: 0.9%

Market Implications:

The IMF highlighted that the global economy faces a critical test from the Middle East conflict, coming on the heels of trade and tariff disruptions experienced in the previous year. The fund warned that a prolonged or expanded conflict could further deteriorate the economic outlook and destabilize financial markets.

Risk Factors:

Additional threats identified include:

• Extended or broader regional conflict
• Increasing geopolitical fragmentation
• Potential reassessment of AI-driven productivity expectations
• Renewed trade tensions
• Rising public debt levels
• Eroding credibility of institutions

IMF Recommendations:

The fund emphasized the need for adaptable policy frameworks, credible institutions, and enhanced international cooperation to navigate current shocks and prepare for future disruptions in an increasingly uncertain global environment.

The downgrade underscores significant headwinds facing UK economic prospects and highlights the country's particular vulnerability to Middle East conflict compared to other advanced economies.