MUFG analysts warn the dollar could strengthen further if US-Iran talks collapse, with energy-driven inflation risks potentially pushing Fed officials toward a more hawkish stance and lifting US yields.
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The US dollar faces renewed upward pressure if Washington and Tehran fail to finalise a ceasefire extension, MUFG Bank analysts warned, arguing that the unresolved conflict is building an inflation risk that could shift the Federal Reserve’s internal balance toward more hawkish rhetoric and push US Treasury yields higher.
The warning comes as the dollar index sits just under at 99, having fallen 0.3% on Thursday after reports that a tentative 60-day truce extension had been agreed, though the deal has yet to receive President Trump’s approval and Iran has not confirmed the text of a potential memorandum of understanding is finalised. Thursday’s PCE data lent that argument some support, with April headline inflation rising at its fastest pace in three years, driven by energy costs tied to the Iran war. While the softer core PCE reading at 0.2% month-on-month provided some relief, the broader inflation picture under a continued conflict scenario gives hawks within the Fed ample material to work with.
The correlation between US yield spreads and foreign exchange rates is tightening again, according to MUFG, which means any repricing in rate expectations flows more directly into dollar strength than it might have in periods when that relationship was looser. That dynamic puts currencies already under pressure from the rate differential, most notably the Japanese yen near the 160-per-dollar threshold, in a particularly exposed position if deal optimism unwinds. The Australian and New Zealand dollars, which strengthened on Thursday’s ceasefire reports, face similar reversal risk.
The Fed itself is navigating the same tension MUFG describes. New chairman Kevin Warsh is widely expected to oversee rate hikes this year, and markets are pricing that outcome with high confidence. If energy-driven inflation accelerates and core measures follow, the pace of that tightening could intensify, reinforcing the dollar’s yield advantage at a time when most other major central banks are either easing or moving far more cautiously.
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The MUFG note crystallises a dynamic that has been building through the week. The dollar index fell 0.3% on Thursday on ceasefire optimism, but as Thursday’s session demonstrated, that move is highly reversible given the number of unresolved issues in the Iran talks. The tightening correlation between yield spreads and FX that MUFG flags is the key transmission mechanism to watch: if energy-driven inflation forces more Fed officials to lean hawkish, the rate differential trade reasserts itself and the dollar recovers its bid. The yen is particularly exposed in that scenario, given it is already pressing toward 160 and Japanese authorities are on intervention watch
