Rates hit 6.75% this week, the Iran war's $200/month impact

In the last week of February 2026, something happened that US homebuyers hadn't seen in over three years: the 30-year fixed mortgage rate briefly dipped below 6%. On February 27, it touched 5.99% (Freddie Mac PMMS). Then, on February 28, the United States and Israel launched joint military strikes on Iran. Over the next 82 days, rates climbed 76 basis points. On May 19, the average 30-year rate hit 6.75%, the highest since August 2025.

If you are shopping for a $400,000 mortgage, that difference is not abstract. At 5.99%, your principal-and-interest payment is $2,396 a month. At 6.75%, it's $2,595. That's $199 more every single month, or $2,388 per year, or $11,940 over five years before you factor in a single dollar of appreciation.

This is what geopolitics costs you at closing.

Why a war in the Middle East moves your mortgage rate

The chain of causation runs through oil. Iran controls access to the Strait of Hormuz, which handles roughly 20% of global oil flow. When military action began in late February, oil prices spiked, crude briefly hit $119 a barrel in early March (Reuters, March 2026). That oil shock then worked its way through the economy: jet fuel, plastics, pharmaceuticals, food manufacturing, everything transported or made from petroleum got more expensive.

The result showed up starkly in April's Consumer Price Index: inflation came in at 3.8% year-over-year, the hottest reading since May 2023 (US Bureau of Labor Statistics, May 2026). That number landed badly with bond markets. When inflation is high and rising, investors demand higher yields on US Treasury bonds to protect their purchasing power. The 10-year Treasury yield (the benchmark that mortgage rates track most closely) climbed to 4.645%.

Mortgage lenders price 30-year loans at a spread above the 10-year Treasury, typically around 1.5 to 2 percentage points. So when the 10-year moves up, mortgage rates follow with mechanical certainty. It doesn't matter that the conflict is 6,000 miles away. The Strait of Hormuz and your refinance are connected by a very short chain.

The rate timeline since February 28

Here is how the 30-year fixed rate has moved since the war began, based on weekly Freddie Mac PMMS data and daily Mortgage News Daily tracking:

The brief retreat from 6.75% to 6.63% came after newswires reported the US and Iran were nearing a draft peace framework. Rates responded within hours. This is the world buyers are now operating in, where a diplomatic headline can move your quoted rate by 15 basis points before lunch.

What today's rates mean for your monthly payment

The table below shows principal-and-interest payments at three rate snapshots. These assume a 30-year fixed loan with no PMI or tax and insurance. Use the Freddie Mac PMMS figure (6.36%) for the weekly survey baseline; use today's daily average (6.63%) for current shopping reality.

The numbers make clear why the brief dip to 5.99% in late February felt significant to anyone actively shopping. That $2,396 payment on a $400,000 loan was the most affordable that loan had been since 2022. The window closed within 24 hours of opening.

The Fed is on hold: possibly all year

Before the war, markets were pricing in two or three Federal Reserve rate cuts in 2026. That calculus has completely reversed. The Fed held rates steady at its most recent FOMC meeting and, given April's CPI reading, is highly unlikely to cut anytime soon. Traders in the fed funds futures market are currently pricing in zero cuts for the full calendar year 2026 (CME FedWatch, May 2026).

The Fed's primary mandate is controlling inflation. Cutting rates when inflation is at 3.8% (with oil-driven cost pressures unlikely to resolve quickly) would be difficult to defend. Fed Chair Powell has signaled the committee will remain "data dependent," which is central bank shorthand for: we will not move until inflation clearly shows it's heading toward 2%, and right now it isn't.

Fannie Mae's latest forecast has the 30-year fixed rate holding near 6.3% through Q1 2027. The Mortgage Bankers Association sees 6.5% as the 2026 average. Neither forecast accounts for a significant escalation of the conflict, or a surprise de-escalation that could bring oil prices down sharply.

What this means for buyers and rate-watchers right now

If you are actively shopping for a home and have a signed purchase contract, the rate lock question is now genuinely urgent. The case for locking is straightforward: rates have moved up 76 basis points in under three months, geopolitical risk remains elevated, and the Fed is not providing any near-term relief. Floating (betting that rates will drop before you close) requires a catalyst. The most plausible one is a peace agreement with Iran, but that is a bet on diplomacy, not on data.

A 45-day rate lock on today's rate of 6.63% costs roughly 0.25% of the loan amount in lock fees, depending on your lender. On a $400,000 loan, that's about $1,000. If rates move up another 25 basis points before you close (from 6.63% to 6.88%) the extra monthly cost on a 30-year loan would be $69/month, or $830/year. The lock fee pays for itself in 15 months. If rates stay flat or drop, you paid $1,000 for insurance against something that didn't happen. Most buyers in this environment are taking that deal.

For existing homeowners tracking refi opportunities: the math is more uncomfortable. If you locked in a rate at 3.8% or below (which millions of homeowners did in 2020 and 2021) the gap has now widened from 6.36% back to 6.63–6.75%. Refinancing at today's rates from 3.8% would add roughly $470–$550 per month on a $300,000 loan, depending on how much rates have moved since you last calculated. Unless you need to pull equity for a specific purpose, or have a compelling reason to move, the refi case is no stronger today than it was last month. In fact, it is slightly weaker.

The one thing that could flip this story fast

We have seen this play out in real time. On May 20, newswires reported that Iran and the US were nearing a final draft of a peace framework. Within hours, mortgage rates pulled back from 6.75% toward 6.63%. If a ceasefire is confirmed, expect oil prices to fall sharply (perhaps 10–15% from current levels) and Treasury yields to follow. A genuine de-escalation could bring 30-year rates back toward 6.2–6.3% within weeks.

The inverse is also true. A significant escalation, strikes on Iranian nuclear infrastructure, or Iranian retaliation against Gulf shipping lanes, would likely push oil above $125/barrel and mortgage rates well above 7%.

This is not a market that rewards certainty. Rate-watching in May 2026 means watching two fronts: the housing data and the news wire.

What this means for you

If you are under contract: lock now. The rate environment is volatile and the direction of risk is upward. A 45-day lock at 6.63% is a defensible decision given what we know today.

If you are still searching: keep your pre-approval current. Pre-approval letters typically expire after 60–90 days, and the rate you qualified at in March may no longer reflect what lenders will offer today. Run the numbers at 6.75% as your worst-case scenario, if the payment is still serviceable, you have flexibility. If it isn't, that's information you need before you're under contract.

If you own at a low rate and have been watching for a refi window: the window that briefly appeared in late February has closed. The next genuine opportunity will require either a significant fall in oil prices or a Fed policy shift, and neither is on the immediate horizon. Keep your target refi rate in mind, check it monthly, and don't let mortgage anxiety push you into a move that doesn't make financial sense.

The Iran war didn't change the fundamentals of housing. Home values are relatively stable, inventory is higher than it's been in years, and sellers are more willing to negotiate than at any point since 2020. What the war did change is the cost of borrowing, and right now, that cost is moving in one direction.