Will the Collapse of the U.S.-Iran Truce Force the Fed to Raise Rates Again?

The market spent much of the week celebrating what appeared to be a major geopolitical breakthrough. The memorandum of understanding (MOU) signed between the U.S. and Iran helped calm fears of a broader regional conflict, sent oil prices lower, and eased concerns that inflation could reaccelerate just as the Federal Reserve was trying to keep it under control.

That optimism is fading fast. The fragile agreement is already showing signs of strain, and investors are once again confronting a reality they hoped had been avoided: higher energy prices, renewed inflation pressure, and a Federal Reserve that may not be finished tightening monetary policy.

The Truce Is Already Showing Cracks

The first warning sign arrived before formal negotiations could even begin. Talks scheduled for today in Switzerland have effectively been put on hold. Vice President JD Vance canceled his planned trip, while Iran’s lead negotiator is no longer expected to travel to Geneva. The diplomatic momentum that followed last weekend’s MOU has stalled.

At the same time, fierce fighting erupted overnight between Israel and Hezbollah. That development is particularly important because a cessation of hostilities in Lebanon was one of the central pillars supporting the broader U.S.-Iran framework.

Reports indicated President Trump clashed sharply with Israeli Prime Minister Benjamin Netanyahu during negotiations surrounding the agreement. Yet Israel’s national security minister subsequently posted on X that “all of Lebanon must burn” — hardly the language investors associate with a durable ceasefire.

In short, the market’s assumption that regional tensions had been contained now looks premature.

Oil Is Rising Again — And The Fed Is Watching

The most immediate consequence has been in energy markets. Following the MOU signing, crude oil prices dropped as traders priced in reduced geopolitical risk and a reopening of key shipping routes. One of the agreement’s provisions called for the immediate reopening of the Strait of Hormuz, through which roughly 20% of global oil supplies pass.

Ships have only recently begun cautiously returning to the waterway. With negotiations now suspended and regional fighting escalating, uncertainty surrounding that transit route has returned. Oil prices have already rebounded from their post-MOU lows.

For investors, that matters because energy remains one of the fastest ways geopolitical events can filter into inflation data. Higher crude prices eventually affect gasoline, transportation costs, manufacturing expenses, and consumer prices.

Fed Chair Kevin Warsh made clear after this week’s Federal Open Market Committee meeting that inflation remains the central bank’s primary concern. While the Fed held rates steady, Warsh emphasized that policymakers remain prepared to respond if inflation pressures reemerge.

That’s becoming a more realistic possibility by the day.

Rate Hike Odds Are Climbing

The Fed’s own projections suggest policymakers are far from united around rate cuts. According to the latest Summary of Economic Projections, nine of the Fed’s 19 members expect at least one rate increase before year-end. That’s nearly half of the committee already anticipating tighter policy.

Betting markets are beginning to reflect that risk. While traders still overwhelmingly expect the Fed to hold rates steady at its July meeting, the probability of a rate hike next month jumped from 15.8% yesterday to 26.2% today as concerns over the Middle East resurfaced.

That isn’t a prediction. But it is a sign that investors are reassessing what looked like a declining risk only a few days ago.

Key Takeaway

The suspension of U.S.-Iran negotiations does not guarantee a Federal Reserve rate hike. Granted, labor market data, consumer spending, and upcoming inflation reports will still carry enormous weight in the Fed’s decision-making process.

That said, the path toward higher rates has become easier to envision. A lasting truce would likely have kept downward pressure on oil prices and reduced one of the market’s biggest inflation risks. Instead, fighting in Lebanon has resumed, negotiations have stalled, and crude prices are moving higher again.

For investors, the key number to watch is no longer just the federal funds rate. It may be the price of oil. If energy inflation accelerates in the coming weeks, the odds of another Fed rate hike could rise right alongside it.