Inflation Set to Spike to 4.2% as Iran Conflict Drives Energy Shock

Bloomberg, the Financial Times, the Hill, CNBC, the New York Times, and Reuters contributed to this report.

Inflation is heating up again – and the war with Iran is a big reason why.

A new report from the Organisation for Economic Co-operation and Development (OECD) puts US inflation at 4.2% for 2026, a sharp jump from earlier forecasts and well above what the Federal Reserve had been expecting. Not long ago, the same figure was closer to 2.8%.

The shift is being driven largely by energy. Oil prices have surged since the conflict began, and the ripple effects are showing up everywhere – from gas stations to grocery shelves.

The OECD didn’t mince words. The war, it said, is already testing the global economy. Disruptions in the Strait of Hormuz – one of the world’s most critical oil routes – have pushed energy prices higher and squeezed supply chains, including key goods like fertilizers.

That’s feeding straight into inflation.

Gas prices in the US tell part of the story. The average gallon now sits around $3.98, roughly a dollar higher than just a month ago. And with no clear end to the conflict, there’s little confidence prices will ease anytime soon.

Other countries are feeling it too, though to different degrees. The OECD sees inflation at 4% in the UK, while Japan and Canada are both projected around 2.4%. The US, for now, is at the higher end of the group.

There’s a second factor quietly adding pressure: tariffs. Even at reduced levels, they’re still pushing costs higher across global supply chains, making the inflation problem harder to shake.

For central banks, this complicates everything.

The Federal Reserve had been edging toward rate cuts. Now that path looks shaky. Higher energy costs risk keeping inflation elevated longer than expected, which could force policymakers to hold rates steady – or even tighten again if price pressures spread.

The OECD’s baseline view is cautious. It expects the Fed to stay on hold through 2027, pointing to stubborn inflation and a still-resilient economy. Growth is projected at about 2% this year before slowing slightly.

There is some relief further out. Inflation is expected to drop sharply to around 1.6% in 2027, even dipping below the Fed’s target. But that hinges on one big assumption: that energy markets stabilize.

Right now, that’s far from guaranteed.

The conflict is approaching the one-month mark, and ceasefire efforts haven’t gone far. President Donald Trump, weighing in this week, claimed Iranian negotiators are “begging” for a deal, even as talks remain stalled and both sides push competing proposals.

Markets aren’t convinced a resolution is close.

And until there’s clarity, the inflation outlook stays tied to the same volatile equation – oil, geopolitics, and how long the disruption lasts.