US mortgage rates hit one-year high as Iran conflict sends Treasury yields soaring

The average 30-year fixed mortgage rate jumped to 6.85% last week, according to the Mortgage Bankers Association, marking the highest level in more than a year. Freddie Mac’s parallel reading came in at 6.71%, telling the same story from a slightly different angle.

The US-Iran conflict that escalated in late February has pushed oil prices toward $100 per barrel, and that pressure is now rippling directly into the cost of financing a home.

How the conflict is repricing American mortgages

Mortgage rates don’t exist in a vacuum. They track the 10-year Treasury yield, which has climbed to nearly 4.8%, a level not seen since late 2023. When investors dump bonds because they expect higher inflation ahead, yields rise. And when yields rise, so does the cost of a 30-year mortgage.

Since the US-Iran conflict began escalating in late February, mortgage rates have climbed by 73 basis points. That’s nearly three-quarters of a percentage point in roughly six months, enough to add hundreds of dollars to a monthly payment on a typical home purchase.

In the week ending September 4, overall mortgage applications fell by 2.7%. Refinancing applications, which are especially sensitive to rate movements, dropped by 6.2%.

Inflation’s five-year overshoot

Inflation has now remained above the Federal Reserve’s 2% target for more than five and a half years. Earlier in 2026, there were genuine hopes that mortgage rates would stabilize as inflation showed signs of cooling. Those expectations have been torched by the geopolitical premium now baked into energy markets.

The bond market is responding accordingly. President Trump has publicly called for rate reductions, a familiar refrain that highlights the tension between political timelines and monetary policy reality.

The Fed’s next meeting is scheduled for September 15-16, and it’s shaping up to be one of the most closely watched policy decisions of the year. Upcoming inflation data will likely determine whether the central bank holds steady or signals any shift in its stance.

What this means for housing and the broader economy

When mortgage rates rise, the pool of qualified buyers shrinks. Sellers who locked in sub-4% rates during the pandemic era have little incentive to list their homes and take on a new mortgage at nearly 7%. This creates a supply-demand mismatch that keeps prices elevated even as transaction volumes decline.

Fewer home sales mean fewer origination fees for lenders. Declining refinancing activity cuts into a revenue stream that many mortgage companies rely on to smooth out cyclical downturns.

What happens next largely depends on two variables: whether the Iran conflict escalates further and what the September inflation data reveals. Rate cuts, which some market participants were still pricing in for late 2026 as recently as a few months ago, could get pushed well into 2027.

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