How the Iran War Is Reshaping Central Bank Policy: Rate Holds, Inflation Jumps, and Growth Warnings

Key ECB projections (March 2026):

• 2026 HICP inflation: 2.6%
• 2027 HICP inflation: 2.0%
• 2028 HICP inflation: 2.1%

The growth outlook was downgraded as the energy shock poses clear downside risks to euro-area economic activity . Despite the official hold, financial markets are not waiting. They began pricing in one to two rate hikes during 2026 amid resurgent inflation fears . Bundesbank President Joachim Nagel added his own hawkish voice, warning that interest rates “could rise if the outlook doesn’t improve” . The ECB is, for now, trying to look through what it hopes is a temporary shock—but the credibility of that stance depends entirely on how long the Strait of Hormuz remains blocked.

Germany: From Modest Recovery to Near-Stagnation

Germany, the eurozone’s largest economy, is feeling the energy shock acutely. The Bundesbank does not set an independent policy rate, but its June 2026 projections paint a stark picture. HICP inflation for Germany has been revised to 2.9% for 2026, nearly double the pre-war forecast of 1.5% . Independent research institutes have gone further: the KfW research institute projects German CPI at 3.1%, with the euro-area average at 3.0% .

Germany’s revised snapshot:

• 2026 GDP growth: 0.5% (halved from approximately 1.0% before the war)
• 2027 GDP growth: Revised down to 0.9% from 1.3%
• Wholesale inflation: Hit a three-year high of 6.3% in April, driven by a 37.3% year-on-year jump in petroleum product prices

The economic damage is already visible. The German Economy Ministry explicitly cited the war for the halving of its growth forecast, and the coalition government announced a roughly €1 billion tax relief package for petrol and diesel to cushion the blow . Yet even that fiscal support looks modest against an energy price shock that has pushed Brent crude up nearly 73% .

Italy: Stuck in the Energy Crossfire

Italy, with its high dependence on imported energy, is particularly exposed. The Banca d’Italia’s April 2026 projections put HICP inflation at 2.6% for the year—a full percentage point higher than its pre-war forecast—with a return to just below the 2.0% target only in 2027 and 2028 . The Bank of Italy has also produced a worst-case scenario in which inflation could exceed 4% in 2026-27 if the energy shock persists .

Italy’s updated outlook:

• 2026 GDP growth: 0.5%, down from 0.6% previously
• 2027 GDP growth: 0.5%, down sharply from 0.8%
• Inflation (2026): 2.6% (HICP)

In a recent address, Governor Panetta described the conflict as a “far-reaching military confrontation” that has nearly halted exports through the Strait of Hormuz and caused significant damage to regional energy infrastructure . Even if a rapid ceasefire were achieved, he warned, a return to orderly energy markets “would take some time” .

South Korea: The Reluctant Hawk Emerges

The Bank of Korea held its benchmark 7-day repurchase rate at 2.50% at both its April and May 2026 meetings—the eighth consecutive hold . But beneath the surface, the monetary policy board is shifting. After a unanimous hold in April, the May meeting revealed a hawkish 5–2 split, with two members voting for an immediate rate hike .

South Korea’s changing numbers:

• 2026 inflation forecast (BoK): Raised to 2.7%, up from a pre-war estimate of 2.2%
• Headline CPI (April 2026): Reached 2.6%, the highest since July 2024
• 2026 GDP growth forecast: Raised to 2.6%, reflecting stronger-than-expected demand

Newly installed Governor Shin Hyun Song has broken decisively from his predecessor’s caution, signaling that rate hikes are likely “in the coming months” due to stronger growth and elevated inflation . The sharp weakening of the Korean won—adding imported inflation on top of the energy shock—is further narrowing the central bank’s room for maneuver .

Brazil: Cutting Rates Into an Inflation Headwind

Brazil is the lone central bank in this group still cutting rates, but the easing cycle is becoming increasingly precarious. The Copom cut the Selic rate by 25 basis points to 14.50% at its April 29 meeting, marking the second consecutive cut of that size . Yet inflation forecasts are now running well above the 3.0% target and the 4.50% tolerance ceiling.

Brazil’s conflicting signals:

• 2026 year-end inflation (Focus survey): 4.71%, exceeding the 4.50% ceiling
• Finance Ministry 2026 forecast: 4.5%, up from 3.7% in March
• Selic rate: 14.50%, down from a peak of 15.0%

Monetary policy director Nilton David acknowledged in March that the central bank “can’t ignore” the Iran war’s fallout and that the rate path “may change” depending on how the shock evolves . The Copom’s own minutes from May revealed it had considered a more hawkish stance, warning that prolonged conflict could force a slowdown or pause in the easing cycle . For now, the bank is attempting to thread a needle—offering cautious rate relief while inflation expectations continue to diverge from its target.

The Bottom Line for Global Policy

The Iran conflict has created a sharp, synchronized energy-price shock that is hitting consumer prices and growth forecasts across the board. The ECB is on hold but facing building market pressure to hike. The Bank of Korea is already signaling a turn. Brazil, still cutting rates, is doing so with inflation well above its target ceiling. The common thread is uncertainty: every central bank’s current forecast is explicitly contingent on how long the energy disruption lasts. So long as the Strait of Hormuz remains effectively closed, the gap between official rate policy and on-the-ground inflation will continue to widen.