Iran War Acting as Major Global Supply Shock; Allianz Cuts World GDP Forecast to 2.6% for 2026

Allianz Research has formally embedded the US-Iran conflict into its core macroeconomic and insurance market forecasts, identifying the hostilities as a 'major external supply shock' that is fundamentally reshaping the global economic and financial landscape. This assessment, embedded in the Global Insurance Report 2026 published May 28, 2026, represents one of the most authoritative private-sector forecasting organisations explicitly quantifying the conflict's economic toll.

In Allianz's central scenario — which assumes some eventual de-escalation but does not assume a rapid ceasefire — global GDP growth is expected to slow to 2.6% in 2026, down from an earlier projection of 3.2%. The sharpest impact falls on the Eurozone, which is forecast to record GDP growth of just 0.8% in 2026 — barely above stagnation — as European economies absorb higher energy import costs, disrupted trade routes through the Middle East, and tighter financial conditions from elevated global inflation.

The mechanism runs as follows: the conflict has caused significant and sustained disruptions to Strait of Hormuz shipping, which handles approximately 20% of the world's traded oil and liquefied natural gas. This supply shock has driven crude oil prices sharply higher — Allianz estimates an approximately 40% surge in global oil prices from pre-war levels — which feeds through into energy bills for households and businesses, transportation costs, manufacturing input prices, and ultimately broad consumer price inflation. The inflationary shock is most pronounced for oil-importing economies: Japan, the Eurozone, India, and South Korea among the largest.

For the insurance industry specifically, the Allianz report identifies second and third-order consequences. Rising inflation increases claims severity for P&C insurers through higher repair costs. Slower economic growth reduces the premium base expansion that insurers need to grow organically. Financial market volatility — equity declines, interest rate instability, currency fluctuations — challenges investment portfolios. War risk and specialty insurance segments face direct exposure through marine, aviation, and political violence lines. And the potential for a ceasefire or resolution creates scenario planning challenges: a sudden peace could rapidly deflate energy prices, reversing many of these dynamics.

If the conflict extends beyond summer 2026 without significant de-escalation, Allianz's scenario analysis points to meaningfully worse outcomes than the current central forecast, potentially pushing Eurozone growth into negative territory and creating conditions for recession in some European economies.