The Federal Reserve raised its target range for the federal funds rate by a quarter point, to 3.75% to 4%, on September 16, 2026, and Freddie Mac's 30-year fixed average rose to 6.95% the next day, from 6.76% a week earlier. The Fed rate hike did not set mortgage rates; the bond market had already moved them. For a Michigan agent, the practical question is not what the Fed did but which of your buyers are exposed to it: the ones with an unlocked rate, a lock that expires before closing, or a pre-approval written at last month's rate. On the metro Detroit median home, the week's move adds about $34 a month to principal and interest. That is small for most buyers and large for the one whose approval was already at its limit.
In short
- The Fed raised the range by 0.25 point to 3.75% to 4% on September 16, 2026, by a 12-0 vote (Federal Reserve).
- Freddie Mac's 30-year fixed average: 6.95% on September 17, up from 6.76% a week earlier and 6.26% a year ago.
- The 10-year Treasury yield rose from 4.79% on September 1 to 5.01% on September 16 (U.S. Treasury).
- On a $337,500 metro Detroit median with 20% down, principal and interest rises from $1,753 to $1,787 a month between those two weekly averages.
How does the Fed rate hike affect mortgage rates?
The Fed sets an overnight rate between banks. A 30-year fixed mortgage is priced off longer-term money, and the 10-year Treasury yield is the usual guide. The yield moved first. The Treasury's daily table shows the 10-year at 4.79% on September 1, 4.95% on September 10, 5.00% on September 15 and 5.01% on the day of the announcement, then 4.94% the day after.
Freddie Mac's survey lags by design. Its weekly figure averages rates offered from Thursday to Wednesday and is published at noon on Thursday, so the 6.95% published on September 17 mostly reflects pricing from before the 2 p.m. announcement on September 16. It also describes a specific borrower: a conventional purchase loan, 20% down, strong credit.
The Fed's statement gave the reason in four words, "Inflation remains elevated," and its own projections put the median expected federal funds rate at 4.1% at the end of 2026. That is a quarter point above the midpoint of the new range, which reads as one more increase this year if the projections hold. Agents should expect rate conversations for the rest of the autumn, not for one week.
What the move costs a Michigan buyer
The figures below use the standard 30-year amortisation formula on 80% of each median price, principal and interest only. Taxes and insurance come on top, and in Michigan the tax line can reset after a sale; the Michigan mortgage payment breakdown covers it.
| Area (August 2026 median) | Loan | At 6.26% | At 6.76% | At 6.95% |
|---|---|---|---|---|
| Metro Detroit ($337,500) | $270,000 | $1,664 | $1,753 | $1,787 |
| Oakland County ($395,000) | $316,000 | $1,948 | $2,052 | $2,092 |
| Macomb County ($280,000) | $224,000 | $1,381 | $1,454 | $1,483 |
| Wayne County ($230,000) | $184,000 | $1,134 | $1,195 | $1,218 |
The medians are from the RE/MAX of Southeastern Michigan Housing Report for August 2026, as reported by DBusiness: 4,282 sales across the region against 4,295 a year earlier, a median of $337,500, and pending sales up 4.8% on the year. Nationally, NAR reported sales of 3.98 million at an annual rate in August and a Midwest median of $340,400. NAR's chief economist, Lawrence Yun, put it plainly: "Mortgage rates and home sales move in opposite directions."
The week's change is $23 to $40 a month depending on the county. The change since a year ago is $84 to $144. For a buyer approved with room to spare, neither number decides anything. For a buyer whose debt-to-income ratio was already at the lender's ceiling, either one can.
Which of your buyers the Fed rate hike actually reaches
- List every pending deal and its lock status. The Consumer Financial Protection Bureau defines a rate lock as a promise that "your interest rate won't change between the offer and closing, as long as you close within the specified time frame and there are no changes to your application." A locked buyer who closes on time is untouched. Ask each loan officer for the lock date and the expiry date in writing.
- Put the lock expiry next to the closing date. The CFPB says locks are "typically available for 30, 45, or 60 days," and that extending one "may be expensive." Any file where the closing date is within a week of the expiry is the file to watch: an appraisal delay or a late title commitment is now worth real money.
- Find the floating buyers. A buyer under contract who has not locked has already absorbed the move. Get the loan officer to reprice today and confirm the buyer still qualifies before the financing contingency runs out.
- Re-run pre-approvals written in August. A letter written at a lower rate overstates what a buyer can borrow at 6.95%. Ask the lender to refresh it before the buyer writes an offer, not after the seller accepts it.
- Give sellers the same numbers. A listing priced for a buyer pool at 6.26% a year ago is being shopped by buyers paying $100 to $150 more a month on the same loan. That belongs in the price conversation, with the county median beside it.
- Keep the explanation short. Buyers read "Fed raises rates" and assume their locked rate went up. One sentence fixes it: the lock holds if we close on time, and here is the date.
The mistake most agents make at step 2
They trust the closing date on the purchase agreement. The lock is tied to the loan closing, and the dates that move it are the ones the agent does not control: the appraisal, the underwriting conditions, the title work. Put the lock expiry in the transaction calendar as its own deadline, with a reminder a week before it, rather than assuming the closing date covers it. The CFPB's own suggested question for the lender is the right one to ask on every file: "What if my closing is delayed and the rate lock expires?"
What we build for this
For teams on the real estate industry page, we build the lead follow-up system that answers every buyer text and call in seconds, around the clock, and routes the question with its context to the agent or loan officer who owns it. In a week like this one, that is the difference between a buyer who hears back before dinner and a buyer who spends the evening reading headlines. We also build the reminder system that runs on the team's own checklist and dates, so a lock expiry sits in the calendar beside the inspection and appraisal deadlines and fires before it is missed. We do not quote rates, give lending advice or interpret a contract; the loan officer and the agent do. For the numbers behind the market itself, the Michigan real estate market report breaks the statewide figures down by county.
The Fed moved on Wednesday. The buyers who feel it are the ones whose dates nobody checked.
