At the start of April, the most optimistic story in finance was straightforward. The Iran war would end soon. Oil would fall. Inflation would ease. And the Federal Reserve would cut interest rates before the end of the year. Cheaper mortgages, cheaper borrowing, rising stocks. That was the base case.
Today that story is dead. And what’s replaced it is one of the most significant financial shifts of 2026.
What Just Changed
A month ago, the probability of a Fed rate hike in 2026 stood at just 1%. This week it climbed to 45%. CNBC
The CME FedWatch Tool raised the probability of a rate hike this year to 50% on May 15, up from 40% the day before. The 30-year Treasury yield topped 5% for the first time in years. The benchmark 10-year yield hit 4.5% for the first time since June 2025. The two-year yield rose above 4% for the first time in 11 months. BlackRock
That’s not a small adjustment. That’s markets doing a complete U-turn on the direction of interest rates in the space of four weeks.
Why It Happened
Three things drove this shift simultaneously.
First, inflation. Following a hotter-than-expected inflation report, market pricing took virtually any chance of a cut off the table between now and the end of 2027. The April CPI came in at 3.8% — the highest since May 2023. Excluding food and energy, core inflation rose 2.8% annually. Bloomberg
Second, wholesale prices. The Producer Price Index surged 6% year-over-year in April — far above the 0.4% analysts expected. Wholesale prices feed into retail prices with a lag of roughly three to six months. That number tells you inflation is not peaking. It’s building.
Third, the Beijing summit delivered nothing on Iran. The Trump-Xi summit ended without any significant breakthroughs on the Iran conflict. No material updates came out of Beijing. The failure to solve the conflict or bring down oil prices has investors concerned inflation might remain a feature of the economy for much longer than expected. LiteFinance
What a Rate Hike Would Actually Mean
Here’s why this matters so much. The Fed’s current interest rate sits at 3.50 to 3.75%. A rate hike would push that higher — meaning borrowing costs across the entire economy go up.
Your mortgage gets more expensive. Business loans get more expensive. Credit card rates rise. The government pays more to service its debt. And perhaps most importantly — stock valuations, which are partly based on the assumption of lower future interest rates, come under pressure.
Every investment model, every discounted cash flow calculation, every price-to-earnings multiple is built on an assumption about where interest rates are going. When the market flips from pricing in cuts to pricing in hikes, those assumptions break. And assets that were priced for a rate-cut world look expensive in a rate-hike world.
Bond traders have been preparing for higher inflation risks since the Iran war began in late February. The incoming Fed chair Kevin Warsh inherits this situation on day one. BlackRock
The Kevin Warsh Problem
The timing couldn’t be more complicated. Jerome Powell’s term ended last week. Kevin Warsh — Trump’s nominee and now confirmed Fed chair — takes over in the middle of the most difficult rate decision since 2022.
Warsh is known as a hawk. He believes inflation is the primary enemy of a healthy economy. In 2010 he was one of the few Fed officials to warn that the post-financial crisis stimulus would eventually cause inflation. He was right, just a decade early.
BNP Paribas Chief US Economist James Egelhof said after the latest inflation data: “Given the Fed’s focus on inflation and the energy shock from the Iran conflict, Warsh may feel compelled to hike rates sooner rather than later if oil prices remain elevated.” BlackRock
If Warsh decides to hike, it would be the first rate increase since 2023. And it would happen against a backdrop of an active war, $100 oil, and an economy that’s holding up but starting to show cracks.
What Needs to Happen for This to Reverse
There’s one thing that changes this entire picture. A deal with Iran.
If the Strait of Hormuz reopens, oil falls sharply. If oil falls sharply, inflation eases. If inflation eases, the Fed doesn’t need to hike. And if the Fed doesn’t hike, the rate-cut story comes back.
Every day the war continues is another day that probability shifts further from cuts toward hikes. The economic damage isn’t abstract anymore — it’s showing up in inflation data, mortgage rates, Treasury yields, and the most significant repricing of interest rate expectations in years.
The Bottom Line
Four weeks ago markets were pricing a 1% chance of a rate hike this year. Today it’s 50%. That shift has moved mortgage rates, Treasury yields, and stock valuations. It’s the direct financial consequence of a war that hasn’t ended and a Beijing summit that delivered nothing.
Rate cuts in 2026 are no longer the base case. Rate hikes are now a coin flip.
The Iran war just changed your interest rate outlook. Again.
