The U.S. entered 2026 poised for a rare growth upgrade — until the war in Iran wiped out that momentum, as the Middle East energy shock pushed headline inflation to its highest level in four years.

On Thursday, the Organization for Economic Co-operation and Development (OECD) made it clear: inflation is rising.

For President Donald Trump, heading into the 2026 midterms, it's a difficult hand as the GOP looks to maintain a razor-thin majority. The Federal Reserve is likely to hold interest rates steady, while the expected growth boost for the U.S. economy has all but vanished.

What The OECD Report Actually Said

U.S. headline inflation is now projected to rise from 2.6% in 2025 to 4.2% in 2026. That’s a 1.2 percentage-point upward revision from the December 2025 forecast. Should energy price pressures fade, headline inflation could fall to 1.6% in 2027.

The OECD projects core inflation, which excludes food and energy, at 3% in 2026. That’s still above the Fed’s 2% target through the full year.

The driver is clear. Brent crude oil prices are roughly 40% higher in 2026 than the OECD assumed in December.

Lower effective tariff rates on U.S. imports — following the Supreme Court’s IEEPA ruling — can partially offset price pressures, the Paris-based organization noted. However, “the impact of higher energy prices on inflation will more than offset the effect from the decline in effective tariff rates.”

On growth, the U.S. remains resilient relative to its peers, with GDP projected at 2% in 2026 and 1.7% in 2027.

But the OECD flags a clear deceleration into 2027, driven by declining real purchasing power, weakening labor force growth, and depleted household savings acting as a brake on consumer spending.

The Fed Is Not Cutting — Not This Year, Not Next

In 2025 and 2026, Trump repeatedly criticized Fed Chair Jerome Powell over slow rate cuts, arguing that they harm the economy. The ongoing war in Iran and rising inflation have now muted his criticisms as the OECD explicitly projects that Federal Reserve policy rates will remain unchanged through the remainder of 2026 and 2027.

The reasoning is a three-part trap — rising headline inflation in the near term, core inflation projected to stay above target through all of 2027, and GDP growth solid enough to remove any urgency for stimulus.

This is not a hold-and-wait posture.

The OECD’s baseline assumes the Fed will watch inflation run above target for the equivalent of two full years before the path clears.

Policy divergence is sharp. The OECD expects the euro area to raise rates modestly in the second quarter 2026 to anchor expectations. Meanwhile, Australia is hiking and Japan is tightening.

“Central banks need to remain vigilant… policy adjustment may be needed if there are signs of broader price pressures or weaker labour market conditions,” the OECD warned.

What Prediction Markets Are Pricing

Prediction odds on Polymarket are, in some respects, slightly more “dovish” than the scenario painted by the OECD.

The most likely 2026 scenario for Fed interest rates is now zero or one cuts, with 0-cut odds at 28.2% and 1-cut at 25.5%.

Fed hike sometime in 2026 — unthinkable a month ago — is now at 22.5%.

There is a 97.7% probability that U.S. inflation exceeds 3% in 2026, effectively a certainty. The 4% threshold is where the debate sits: 44% odds, suggesting markets see the OECD’s 4.2% central forecast as a coin flip rather than a lock.

What This Means For Investors

For investors, the OECD report confirms a prolonged high-rate environment that weighs on borrowing-cost-sensitive sectors — real estate, utilities, consumer discretionary — while energy producers and companies with genuine pricing power maintain a structural edge heading into the second half of 2026.

Since the start of the war in Iran, the Energy Select Sector SPDR Fund (NYSE:XLE) has rallied 8.4%, while
the Real Estate Select Sector SPDR Fund (NYSE:XLRE) has lost nearly 9%.

The political dimension compounds the economic one.

Trump enters a midterm cycle with inflation running at a four-year high, a Fed unable to offer relief, and an energy shock originating from a conflict that continues to escalate, as the U.S. military reportedly prepares plans for ground operations.

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