Mortgage Rates Jump to 9-Month Highs
Ask any parent: a lot can change in 9 months.
One minute you’re picking out baby names, the next you’re negotiating with a tiny dictator over applesauce. Mortgage rates have had a similar journey. Over the past 9 months, the average 30-year fixed rate dropped about 0.65%, only to climb right back up by the end of this week. And this week did plenty of damage all by itself, with rates rising 0.23% for the average lender as hopes for a quick end to the Iran war faded in a hurry.
The war has been responsible for essentially all of that 0.65% jump, and the reason is actually pretty straightforward:
- Rates are based on bonds
- Bonds hate inflation
- Higher fuel prices tied to war suggest more inflation
- More inflation usually means higher rates, all else equal
There’s also another issue: wars cost money. A lot of it. That means the government may need to issue more debt to fund things, and more debt issuance tends to push rates higher as well.
So in short, bonds see war, inflation, and more government borrowing and basically say, “Yeah, we’re gonna need a higher yield for this.”
Fresh economic data this week showed that the inflationary impact of the war is starting to show up in the domestic economy. The Consumer Price Index (CPI) hit its highest level since 2023. Even Core CPI, which strips out food and energy, came in hot, with annual inflation at its highest since 2025 and monthly inflation tied for the fastest pace since 2023.
Not exactly the kind of report that makes rates relax.
Wholesale inflation looked even uglier, based on the Producer Price Index (PPI). The annual PPI rate surged to 6.0%, the highest since late 2022. Core PPI also hit 5.2%, its highest reading since 2022.
Basically, inflation did not merely tap the market on the shoulder this week. It kicked the door in.
That said, the inflation reports themselves were not the biggest surprise. The market had already started moving rates higher right when the war began because it expected inflation data to worsen. In other words, markets don’t politely wait for the official numbers. They see the smoke and start running before the fire alarm even goes off.
That brings us to Friday, which ended up being the worst day for rates since the war began.
Some traders had been hoping that this week’s Trump/Xi summit might help create a diplomatic shift that could speed up a peace deal with Iran. But once the summit ended without any such news, the bond market wasted no time sending yields higher.
By the end of Friday, 10-year Treasury yields were up more than 0.11%, reaching their highest levels in a year. Mortgage rates were “only” back to August levels, thanks in part to increased bond buying from Fannie Mae and Freddie Mac. Their purchases of mortgage-backed securities helped narrow the gap between mortgage rates and Treasury yields.
So yes, rates went up, but they could have thrown an even bigger tantrum.
Looking ahead, the market will remain highly sensitive to war-related developments. If a peace deal happens soon, rates could absolutely move lower. But if this week taught us anything, it’s that when hopes for peace start fading, rates have no issue moving higher in a hurry.
So for now, mortgage rates remain stuck in headline mode: calm one minute, dramatic the next, and always ready to overreact just a little.