Hopes of a lower-for-longer environment have been dashed by the weekend’s attacks – or have they?
US mortgage rates have been drifting lower for weeks, giving loan officers and brokers a long‑awaited break. The latest Middle East shock is now putting that fragile improvement to the test through a jump in 10‑year Treasury yields.
The weekend strikes by the US and Israel on Iran arrived just as investors had pushed the 10‑year Treasury to an 11‑month low near 3.92%. Instead of sparking the classic rush into government bonds, the new conflict reversed the move. Yields on the 10‑year climbed about seven basis points to roughly 4.03%, with the 30‑year also moving higher.
Several cross‑currents helped produce that outcome. Crude prices jumped on fears of supply disruptions, lifting inflation worries. At the same time, more conciliatory public messages from Washington and Tehran tempered demand for Treasurys as a pure safe haven, even though tensions remained high.
READ MORE: US-Israel strokes on Iran cause Treasury rates to skyrocket
This is not just an oil‑market story. It is a rates story, because the conflict is now showing up directly in the Treasury curve that underpins every rate sheet in the country.
A rate rally meets a geopolitical shock
Only days before the latest Middle East headlines, the backdrop for housing finance had finally turned more favorable. Freddie Mac’s weekly survey showed the average 30‑year fixed slipping to 5.98% as of February 26, the first time in more than three years that it has printed in the 5% range.
Those sub‑6% levels, echoed by other trackers, had started to revive purchase interest and nudge refinance conversations back onto the calendar. Pipelines were rebuilding from depressed 2025 volumes, and many lenders were cautiously increasing capacity for the spring market.
The Iran war introduces a new variable. If higher energy prices and renewed geopolitical risk keep the 10‑year pinned closer to 4% or above, the recent improvement in mortgage rates may stall, or even partially unwind.
How the Iran war feeds into the 10‑year
The mechanics are familiar, but worth spelling out in this context.
Oil is the first‑order transmission channel. Any sustained threat to supply from Iran or the Strait of Hormuz tends to push crude higher, raising gasoline and transport costs and, over time, seeping into broader inflation measures if the shock persists. That, in turn, shapes expectations for the Federal Reserve’s policy path.
In the opening days of the latest flare‑up, traders continued to assume that the Fed will cut rates later this year, but the jump in Treasury yields shows markets demanding a bit more compensation for inflation and geopolitical risk along the curve.
Analysts quoted in the MPA report noted that the traditional link between war headlines and lower yields has weakened. One strategist said the recent news flow had helped “steady” sentiment, with investors watching closely for clues on how long and how intense any military campaign might be. Another pointed out that the usual “bond‑as‑haven” trade is “less clean” if higher oil prices keep inflation sticky, arguing that what matters most is how persistent the oil move becomes.
In other words, the same conflict that might once have guaranteed a strong rally in Treasurys is now capable of pushing yields up if it reinforces the idea that inflation will not retreat quickly.
The mortgage link: a benchmark that just moved
For lenders and capital‑markets desks, the movement in the 10‑year matters more than the day‑to‑day price of crude.
US mortgage rates are set off the back of 10‑year yields and the spread on mortgage‑backed securities. In the weeks leading up to the Iran strikes, that benchmark yield had been trending down, and MBS spreads were stable enough to let retail rates follow. The combination carried the 30‑year fixed from the 7% area last year to just under 6% now, according to Freddie Mac.
The fresh back‑up in the 10‑year does not yet erase that progress, but it narrows the margin for further improvement. If the yield settles comfortably above 4% again, the industry should expect more resistance around the current sub‑6% mortgage level and greater intraday volatility in rate sheets.
Three ways this could play out for mortgage rates
From a risk‑management standpoint, it is useful to think in terms of paths rather than point forecasts.
1. Brief flare‑up, oil spike fades.
If the conflict remains contained and energy flows normalize quickly, markets may treat the latest move as a short‑term scare. Oil could give back part of its gains, and investors might refocus on incoming US data—jobs, inflation, and spending—rather than on Middle East headlines. In that scenario, the 10‑year could drift back toward its recent lows, allowing the 30‑year fixed to stay near or slightly below 6% into the spring buying season.
2. Prolonged disruption, higher‑for‑longer yields.
If Iranian supply or shipping lanes are impaired for an extended period, and crude holds at much higher levels, inflation concerns are likely to overshadow the safe‑haven trade. The result would be stickier term premiums and a 10‑year anchored above 4%. Mortgage professionals would then be working in a world where the recent rally stalls out, with primary rates edging back into the low‑6% range and refinancing momentum cooling.
3. Escalation plus growth scare.
There is also a less intuitive path: conflict escalates, oil remains expensive, but the dominant story becomes global growth risk. If energy costs threaten to undercut consumer spending and corporate investment worldwide, markets may mark down longer‑term growth and inflation expectations. Under that script, Treasurys could rally despite high oil, pulling the 10‑year lower and giving mortgage rates another leg down - though often with wider MBS spreads as volatility climbs.
Each of these paths runs through the same chokepoint: the level of the 10‑year Treasury and the spread investors demand for holding MBS in a more uncertain world.
What you should be watching
Against this backdrop, there are a few gauges that deserve particular attention in coming weeks.
First, the 10‑year itself. The move from an 11‑month low near 3.92% back above 4% underlines how quickly geopolitical news can whipsaw benchmark yields. For lock desks and hedging teams, that argues for tighter monitoring of duration exposure and more conservative assumptions about intraday reprices.
Second, the shape of the curve and the Fed‑funds futures strip. The Iran war will not dictate Fed policy on its own, but if oil‑driven inflation shows up in US data, the market’s expected number and timing of rate cuts will change. A flatter strip with fewer cuts tends to pull long‑term yields higher than they would otherwise be.
Third, MBS performance relative to Treasurys. In bouts of geopolitical stress, investors often crowd into the simplest safe assets and demand extra compensation for more complex instruments such as mortgages. Even if the 10‑year holds steady, a widening of MBS spreads would show up as higher primary mortgage rates and choppier pricing for borrowers.
Finally, core inflation. Headline numbers will reflect swings in gasoline and energy, but what ultimately matters for the Fed - and, by extension, for the 10‑year - is whether higher oil spills into wages and services. If that happens, the “higher for longer” narrative on policy rates is likely to harden.
