Euro falls to one-year low as US-Iran deal reshapes ECB rate path

The euro slid to its lowest since June 2025, down 2.6% month-to-date, as the US-Iran agreement drove oil prices lower and Eurozone PMI data returned to contraction territory, compressing the ECB's tightening window.

"The combination of weaker growth and lower energy prices is relieving pressure on the ECB to keep hiking," said Lee Hardman, senior currency economist at MUFG. "The market is now questioning whether the second hike will happen at all."

Rate markets still fully price a single 25-basis-point increase for 2026, but the probability of a second move has collapsed to about 20% from roughly 50% last month, according to OIS pricing. The shift follows the Eurozone composite PMI's slide below 50 in June, signaling contraction in business activity for the first time since late 2024. Energy inflation, while still elevated at 10.8% year over year in May, is expected to ease further as the US-Iran accord stabilizes crude supply.

The repricing matters because it widens the rate differential with the US, where the Federal Reserve has maintained a hawkish stance. A sustained break below current levels could open the path toward parity, a level not tested since late 2022. The ECB's next policy decision is scheduled for July 24.

The macro backdrop has shifted decisively against the euro in recent weeks. What began as a geopolitical risk premium tied to the Iran conflict has evolved into a structural reassessment of the euro area's growth trajectory. The US-Iran agreement, while welcome for energy markets, removed the very inflation scare that had justified hawkish ECB bets. With Brent crude retreating from war-driven highs, the input-price channel that had kept headline inflation above 3% is now reversing.

ECB President Christine Lagarde reinforced the dovish repricing last week, telling reporters that current economic data does not warrant a stronger policy response. The comment marked a clear departure from the bank's earlier posture and was read by markets as an acknowledgment that the growth outlook has deteriorated faster than anticipated.

Growth slows as energy shock lingers

The euro area's economic weakness is no longer confined to manufacturing. Services activity, which had held up through the first quarter, softened in May and June as higher energy costs eroded household purchasing power. ECB Executive Board member Philip Lane told the European Parliament on Tuesday that domestic demand is now expected to be weaker than the bank projected in March, with real GDP growth forecast at just 0.8% for 2026, followed by 1.2% in 2027.

Capital Economics argues the ECB's tightening cycle may already be over. "This could be a one-and-done situation," the research firm said in a note, pointing to moderating pipeline price pressures and limited second-round wage effects. Headline inflation is projected to average 3% in 2026 before declining to 2.3% in 2027 and reaching the ECB's 2% target in 2028, according to the bank's June staff projections.

Dollar strength adds to euro headwinds

On the other side of the Atlantic, the Federal Reserve has shown no inclination to ease. US inflation accelerated at its fastest pace in three years in April, driven by energy costs tied to the Iran conflict, cementing expectations that the Fed will hold rates unchanged well into 2027. The resulting yield advantage has pushed the dollar index above 101.7, its highest level since April.

The divergence in policy trajectories creates a self-reinforcing dynamic for the euro. A weaker currency imports additional inflation through higher energy and input costs, but the ECB's ability to respond with tighter policy is constrained by the fragile growth backdrop. The last time the euro traded at these levels, in mid-2025, it rebounded within two months as the ECB delivered a surprise hike. This time, markets see no such catalyst on the horizon.

This article is for informational purposes only and does not constitute investment advice.