VOL. 1 · ISSUE 18 · WEEK OF SEPTEMBER 21, 2026
The Fed Moved 25 Basis Points. Mortgage Rates Didn’t Move With It.
The Federal Reserve raised its target range by 25 basis points. The Optimal Blue 30-year conforming index was effectively unchanged from the day before the announcement to the day after it.
EXECUTIVE SUMMARY
The Announcement Was Not the Repricing
On September 16, the Federal Reserve raised its target range by 25 basis points to 3.75%–4.00%. The vote was unanimous. Yet the Optimal Blue 30-year conforming index was 7.014% on September 15 and 7.013% on September 17—essentially unchanged across the decision.
+25 bps
Federal Reserve target-range change · September 16
7.014%
OBMMI 30-year conforming · September 15
7.013%
OBMMI 30-year conforming · September 17
−0.1 bp
Change from the day before to the day after
That does not mean mortgage rates were stable. The conforming index had already climbed from 6.744% on September 3 to 7.013% on September 17, a 26.9-basis-point two-week increase. The market repriced expectations before and around the meeting rather than waiting for the press release.
The Fed’s September projections also shifted higher: the median federal-funds-rate projection for year-end 2026 rose to 4.1% from 3.8% in June, while the 2027 median rose to 4.1% from 3.6%. Projections are not promises, but they describe a less rate-friendly policy path than the June forecast.
Markets price paths, not press conferences.
Sources: Federal Reserve FOMC statement and Summary of Economic Projections, September 16, 2026; Optimal Blue OBMMI through September 17, 2026.
SIGNAL VS. NOISE
A Fed Hike Is an Event. Mortgage Pricing Is a Market.
| Noise | Signal |
|---|---|
| “The Fed raised 25 basis points, so mortgage rates rose 25 basis points.” The federal-funds rate is an overnight interbank policy rate. It is not a consumer mortgage rate. | Mortgage pricing held across the decision. OBMMI was 7.014% on September 15 and 7.013% on September 17. |
| “Rates should jump after the announcement.” A one-for-one reaction assumes the market waited for information that had been anticipated and debated for weeks. | The move came earlier. The 30-year conforming index rose 26.9 basis points from September 3 through September 17. |
| “The pressure is gone.” One calm two-day comparison does not erase the prior increase or guarantee the next move. | The path stayed restrictive. The Fed’s median 2026 and 2027 policy-rate projections both moved higher than in June. |
What belongs in a real mortgage-rate framework? Treasury yields, inflation expectations, economic growth, mortgage-backed-securities demand, lender capacity, risk premiums, loan product, credit profile and transaction structure. The Fed influences that system, but it does not replace it.
The mistake is not watching the Fed. The mistake is treating the Fed as the mortgage-rate table.
Sources: Federal Reserve, September 16, 2026; Optimal Blue OBMMI, September 3–17, 2026. Interpretation by Steve Combs.
MARKET INTELLIGENCE
Rates Rose Before the Vote—Then Held
Optimal Blue OBMMI observation date: September 17, 2026. Optimal Blue measures actual rate locks processed through its platform. These national indexes provide market context; they are not individual rate quotes.
7.013%
30-year conforming
6.395%
15-year conforming
6.781%
30-year FHA
6.694%
30-year VA
6.827%
30-year USDA
7.124%
30-year jumbo
Secondary benchmarks: Freddie Mac PMMS for the week ending September 17 reported 6.95% for a 30-year fixed mortgage and 6.26% for a 15-year fixed mortgage. The 10-year Treasury yield was 4.94% on September 17. These measures use different methodologies and are shown separately—not averaged.
Inflation
Headline CPI: +0.4% MoM; +3.4% YoY
Core CPI: +0.3% MoM; +2.4% YoY
Energy rose 2.1% in August.
Labor
Payrolls: +162,000
Unemployment: 4.1%
Revisions: +55,000 combined for June and July.
Fed Projections
2026 funds rate: 4.1% median
2027 funds rate: 4.1% median
2026 PCE: 3.7% median.
Closed-Sale Market · Redfin · August
$398,596 median sale price (+2.2% YoY)
291,769 homes sold (−0.45% YoY)
50 days closed-sale median DOM
98.5% sale-to-list ratio
Listing Market · Realtor.com · August
$424,500 median listing price (−1.3% YoY)
1,140,035 active listings (+3.6% YoY)
60 days listing-market median DOM
20.4% of listings with price cuts
Sources: Optimal Blue OBMMI; Freddie Mac PMMS; Federal Reserve H.15 and FOMC projections; U.S. Bureau of Labor Statistics CPI and Employment Situation; Redfin; Realtor.com Economic Research.
HOUSING MATH
Two Weeks Removed $13,492 of Purchase Capacity
Illustrative assumptions: $450,000 original loan · 30-year fixed · principal and interest only.
$2,917
September 3 · 6.744%
Monthly principal and interest
$2,958
September 10 · 6.880%
Monthly principal and interest
$2,998
September 17 · 7.013%
Monthly principal and interest
+26.9 bps
Two-week rate movement
+$81/mo
Payment increase · $972 annualized
$437,857
Approximate loan supported at 7.013% by the original $2,917 payment
Same payment: approximately $486,508 purchase price with 10% down—$13,492 below $500,000.
Holding the original $2,917 principal-and-interest payment constant at 7.013% reduces the supportable loan amount by approximately $12,143. With 10% down, that translates to approximately $13,492 less purchase price.
Calculations independently verified using the standard fixed-rate amortization formula and rounded to the nearest whole dollar. Examples exclude taxes, homeowners insurance, mortgage insurance, association dues, points, closing costs and other charges. Illustration only; not a rate quote or commitment to lend.
SOUTHERN MARYLAND PULSE
More Choice. Three Different Negotiating Environments.
Observation period: August 2026. Closed-sale market data: Redfin. Listing-market data: Realtor.com Economic Research County Housing Inventory Core Metrics. Published September 21, 2026.
St. Mary’s County
Closed-sale market
$434K median sale price (+4.5% YoY)
121 homes sold (+7.3%)
42 days closed-sale median DOM (+3)
Listing market
275 active listings (+14.6% YoY)
$459,950 median listing price (−3.7%)
36 days listing-market median DOM (−2)
More active inventory coexisted with higher closed prices and more closings. More choice did not produce a countywide price retreat.
Calvert County
Closed-sale market
$467K median sale price (−0.6% YoY)
118 homes sold (+4.5%)
48 days closed-sale median DOM (+11)
Listing market
324 active listings (+50.7% YoY)
$515,000 median listing price (−6.8%)
36 days listing-market median DOM (−3)
Inventory expanded sharply and closed-sale DOM lengthened, yet the median closed price remained nearly unchanged.
Charles County
Closed-sale market
$434K median sale price (−3.7% YoY)
215 homes sold (+0.5%)
52 days closed-sale median DOM (+3)
Listing market
622 active listings (+7.4% YoY)
$477,590 median listing price (−3.2%)
45 days listing-market median DOM (+7)
The broadest negotiating opportunity appears here, but leverage still depends on the property, price and competition.
Period and methodology note: August remains the newest complete county observation month. Repeating these figures from Issue 17 is intentional. Redfin closed-sale DOM and Realtor.com listing-market DOM are different measures and are not interchangeable.
REGIONAL SPOTLIGHT · SOUTHWEST WATERFRONT · WASHINGTON, DC
The Median Fell 26%. Comparable Value Did Not.
Redfin closed-sale market · three months ending August 2026.
$364,824
Median sale price · −26.0% YoY
$366
Price per square foot · −0.41% YoY
106 days
Closed-sale median DOM · +28 days YoY
96.3%
Sale-to-list ratio · −0.38 point YoY
Redfin’s three-month period ending August reports a 26.0% decline in the median closed-sale price. Read alone, that number resembles a market collapse. But the median price per square foot declined only 0.41% over the same reported period.
Verified fact: The typical closed-sale price was materially lower than one year earlier. Interpretation: Longer exposure and a lower sale-to-list ratio indicate a softer negotiating environment. Inference: The much smaller change in price per square foot is strong evidence that the mix of properties sold changed; it does not establish that every comparable property lost 26% of value.
The median is context. Comparable evidence is valuation.
Methodology: Redfin describes these neighborhood measures as covering the three months ending August 2026 and calculates them from MLS and/or public-record data. The sales-mix explanation is an evidence-based inference, not a measured decomposition supplied by Redfin.
STEVE’S TAKE
Do Not Let a Press Conference Become the Plan
The most important lesson this week is not that the Fed raised its policy rate. It is that the mortgage market had already moved—and then barely changed across the announcement itself.
Buyers, sellers and homeowners often wait for a meeting because it feels like a clean decision point. But the market is continuously absorbing inflation, employment, Treasury supply, investor demand, mortgage-backed-securities spreads and expectations about what may come next.
For a Buyer
Set the complete monthly obligation first. Carry a rate buffer. Know how much cash should remain after closing. If the plan only works at one hoped-for rate, it is not yet durable.
For a Seller
Do not assume a Fed headline will create or destroy demand uniformly. Focus on property condition, pricing, competing inventory and whether financing can improve the buyer’s payment efficiently.
For a Homeowner
Define the refinance threshold before the market reaches it: payment improvement, total transaction cost, break-even period and expected time in the loan.
Issue 11 established that the Fed is not the mortgage market. Issue 17 showed that mortgage rates can move before the meeting. Issue 18 completes the sequence: even when the Fed moved 25 basis points, the mortgage index was effectively unchanged across the decision.
The goal is not to predict the next move. The goal is to remain prepared for more than one outcome.
CONTINUE YOUR PLANNING
Turn Market Information Into a Personal Decision.
Before you build a plan around a rate headline, ask: Is this a Fed policy rate, Treasury yield, mortgage index or actual quote? What complete monthly housing obligation remains comfortable? How much liquidity should remain after closing? What improvement would justify a refinance or rate strategy? Does the plan work without requiring a forecast to be correct?
CLOSING
Build the Plan Before the Next Headline.
The policy rate changed. The mortgage index finished almost exactly where it began around the decision.
That is not a forecast about the next move. It is a reminder that a durable housing or mortgage strategy cannot depend on one meeting, one headline or one outcome.
Primary sources: Redfin · Realtor.com Economic Research · Optimal Blue OBMMI · Freddie Mac PMMS · Federal Reserve · U.S. Bureau of Labor Statistics.
Data and editorial disclosure: Sources use different methodologies, coverage, collection periods and revision practices. Figures are not interchangeable. Medians do not measure every property. Rate indices and surveys are national benchmarks, not offers to lend. This material is for informational and educational purposes only and is not a commitment to lend. Mortgage rates, programs and guidelines are subject to change without notice. Not all applicants or properties will qualify. Examples are illustrative and do not constitute financial, tax or legal advice.