Why your mortgage rate does not follow the Fed's rate
The Fed sets an overnight rate. Your mortgage is priced off a ten-year bond plus a spread, and the two move for different reasons. The gap is why a Fed decision does not land on your housing payment.
Both rates in this article have moved, and they moved in opposite directions to the one a reader might expect — which is the argument the piece makes.
On 16 September the Federal Open Market Committee raised its target range to 3.75%–4.00%. The next day Freddie Mac put the 30-year fixed mortgage at 6.95%, up from 6.76% the week before and 6.26% a year earlier. The spread over the policy rate is therefore narrower than the figures below, while the rate a household actually pays is higher.
The analysis is unchanged: the mortgage rate followed the thirty-year end of the bond market, not the Fed’s overnight rate. We have not rewritten the numbers below — they describe the week the article was published. What a 6.95% mortgage is worth against every other rate on offer.
- What happened
- The 30-year fixed mortgage rate averaged 6.67% in the week to August 13, 2026 — down from 6.69% the week before and up from 6.58% a year earlier. The Fed's target range is 3.50–3.75%.
- Why
- Mortgage rates are priced off long-term Treasury yields plus a spread, not off the Fed's overnight rate. The 10-year Treasury closed at 4.695% on Friday, August 14, 2026.
- The numbers that matter
- 6.67%30-year fixed5.96%15-year fixed4.695%10-yr Treasury1.98ppSpread over the 10-year
- Why it matters
- On a $400,000 loan, the difference between 6.67% and 5.67% is roughly $260 a month. Understanding what actually moves that rate is worth more than watching Fed meetings.
- What happens nextas we saw it on 16 Aug 2026
- Freddie Mac publishes its survey every Thursday. Housing starts and building permits for July are released Tuesday, August 18.
The Fed sets the bottom bar. Your mortgage is the top one. The distance between them is not policy — it is market structure.
| 30-year mortgage | 6.7% |
|---|---|
| 15-year mortgage | 6.0% |
| 10-year Treasury | 4.7% |
| Fed funds (upper) | 3.8% |
There is a widely held belief that when the Federal Reserve cuts interest rates, mortgage rates fall. It is intuitive, it is repeated constantly, and it is close enough to true that correcting it feels pedantic.
It is also the reason a lot of people are waiting for something that may not arrive in the form they expect.
The three rates, and what each one does
The Federal Reserve sets the first one. It is an overnight rate — the cost of money for one night, between banks. It is the shortest-term interest rate that exists in any meaningful sense.
Your mortgage is the opposite: a commitment measured in decades. Its price is set by what investors demand to hold long-dated US debt, plus compensation for everything that makes a mortgage riskier than a Treasury bond.
The spread, calculated
30-year fixed mortgage rate: 6.67% (Freddie Mac, week to August 13, 2026)
10-year Treasury yield: 4.695% (close, August 14, 2026)
Difference: 1.975 percentage points
Note on method: the 10-year Treasury is the conventional benchmark for 30-year mortgages, because most mortgages are repaid or refinanced well before 30 years. The two figures are from adjacent days, which is normal practice but not a same-instant comparison.
That ~2 percentage point spread is not a fee anyone charges. It is the sum of several distinct compensations:
- Prepayment risk. You can refinance whenever rates fall, but you cannot be forced to pay more when they rise. The investor holding your mortgage has given you a valuable option and charges for it.
- Credit risk. Households default; the US Treasury does not, in dollars.
- Servicing and origination. Someone administers the loan for thirty years and is paid to do it.
- Guarantee fees. Where a loan is packaged into a government-backed security, the guarantor charges for the guarantee.
- Who is buying. The demand for mortgage-backed securities from banks and other large investors moves the spread independently of anything the Fed does.
Why cuts do not automatically pass through
When the Fed cuts its overnight rate, it directly affects short-term borrowing: credit cards, floating-rate business debt, home equity lines. Long-term rates respond to something else — expectations about inflation and growth over the entire life of the loan.
If the Fed were to cut aggressively while inflation remained at 3.4%, long-term investors might reasonably demand more compensation for holding 30-year paper, not less — because faster cuts would raise the expected long-run inflation rate. In that scenario the mortgage rate could rise while the policy rate falls.
This is an interpretation of how the mechanism works, not a forecast. But it explains the year just past: the policy rate sits at 3.50–3.75% and the 30-year mortgage is 6.67%, nine basis points higher than a year earlier.
What this means in a monthly payment
On a $400,000 30-year fixed loan, the standard amortisation formula gives a principal-and-interest payment of approximately $2,574 at 6.67%, and approximately $2,314 at 5.67%.
Difference: roughly $260 per month, or about $3,100 a year.
Assumptions: principal and interest only. Excludes property tax, insurance, HOA fees and mortgage insurance, which for many borrowers add several hundred dollars more. The 5.67% figure is an illustration, not a projection.
That difference is worth watching for. It is not worth waiting indefinitely for, because the thing that would deliver it is a fall in long-term yields, and long-term yields are being held up by the same 3.4% inflation rate that is keeping the Fed on hold.
What to actually watch
- The 10-year Treasury yield, not the Fed funds rate. It is published continuously and it is the input that matters.
- The spread itself. If it narrows toward historical norms, mortgage rates can fall even with Treasury yields unchanged.
- Inflation expectations, which drive long-term yields more than any single Fed meeting does.
- The 15-year alternative. At 5.96% versus 6.67%, the shorter term costs 71 basis points less — a meaningful difference for borrowers who can carry the higher monthly payment.
Sources
- Primary Mortgage Market SurveyFreddie Mac · Aug 13, 2026 · Primary source
- Market Review: August 14, 2026Investrade · Aug 14, 2026 · Secondary source
- Implementation Note issued July 29, 2026Federal Reserve Board · Jul 29, 2026 · Primary source
- Consumer Price Index Summary — July 2026U.S. Bureau of Labor Statistics · Aug 12, 2026 · Primary source
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