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Markets · 4 min

The Fed sets 4%. The bond market says 5%. The gap is the interesting part.

The 10-year Treasury yielded 5.00% on September 15, above the federal funds target the Fed set the following day. That is not how the textbook draws it.

By Wealth Signal, Editor and publisher ·Published
As of Sep 21, 2026
Written 21 September 2026 and not revised since. Every figure below is as of that date. Where a number has moved, the markets page carries the current one with the date it was observed, and data status says when each was last confirmed.
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30-second read
What happened
The 10-year Treasury constant maturity rate was 5.00% on September 15, 2026. On September 16 the Federal Reserve set its federal funds target range at 3.75%–4.00%.
Why
The Fed sets an overnight rate. The 10-year is set by buyers and sellers pricing a decade of expected short rates plus compensation for the risk of holding a long bond. They are different instruments answering different questions.
The numbers that matter
5.00%10-year Treasury, September 15
3.75–4.00%Fed funds target, September 16
6.95%30-year mortgage, week of September 17
~1.0pp10-year above funds upper bound
Why it matters
Mortgages, corporate borrowing and the discount rate under every long-dated asset are priced off the long end, not off the Fed's overnight rate.
What happens nextas we saw it on 21 Sep 2026
Freddie Mac publishes its mortgage survey weekly; the Treasury publishes the constant maturity series daily.
Go deeper ↓
Three rates, three different jobs
US interest rates — observations of mid-September 2026

The rate you borrow a house at sits three points above the rate the Fed sets.

US interest rates — observations of mid-September 2026
30-year fixed mortgage7.0%
10-year Treasury5.0%
Fed funds, upper bound4.0%
%Source: Freddie Mac PMMS (Sep 17, 2026); U.S. Treasury via FRED (Sep 15, 2026); Federal Reserve Board (Sep 16, 2026)
Go deeper

On September 15 the 10-year Treasury yielded 5.00%. The next day the Federal Reserve set the federal funds target range at 3.75%–4.00%.

So the government pays more to borrow for ten years than the central bank charges banks overnight. That is the normal shape of things — but the size of the gap, with the Fed actively raising rates, is worth understanding.

Why they are not the same number

The federal funds rate is an overnight rate the Fed controls directly. The 10-year is a price discovered in a market, and it contains two things: what buyers expect the average short rate to be over the next ten years, and how much extra they demand for locking money up that long.

Fact
The Fed does not set the 10-year
It influences it, through expectations of future short rates. But the long end is priced by buyers and sellers, and it can move against the Fed — rising when the Fed cuts, or falling when the Fed hikes.

What it means for a mortgage

This is where the long end reaches most households. Fixed mortgage rates track long-dated yields, not the overnight rate. Freddie Mac put the 30-year fixed at 6.95% in the week of September 17.

Wealth Signal calculation
The mortgage sits about two points above the 10-year
A 30-year fixed at 6.95% against a 10-year Treasury at 5.00% is a spread of roughly 1.95 percentage points. These are observations from different days — September 17 and 15 — so the figure is indicative rather than a same-moment measurement.

That spread covers the lender's costs, the risk you repay early, and the market's appetite for mortgage debt. It is not fixed, and it widens when lenders are nervous.

The practical version

  • A Fed hike does not mechanically raise your fixed mortgage rate.
  • A move in the 10-year is the better thing to watch if you are financing a house.
  • Cash savings track the short rate the Fed does control, which is why they responded faster.
Each figure here is a separate observation with its own date, and they are not simultaneous. Treating three rates measured across three days as one snapshot is the kind of small dishonesty this site tries to avoid.

Sources

Wealth Signal prefers primary sources — regulators, statistical agencies and company filings. Named secondary sources are used where a primary document does not exist or is not public. Our source standards.

Wealth Signal
Editor and publisher · Markets, economics, personal finance

Wealth Signal is researched, written, edited and published by one person, under the Wealth Signal name. Every figure links to the document it came from, and errors are corrected on the page and logged publicly.

Related analysis

Cite this: Wealth Signal NYC (September 21, 2026). “The Fed sets 4%. The bond market says 5%. The gap is the interesting part.” https://www.wealthsignalnyc.com/stories/ten-year-at-five-percent/ — the figures are the issuing agency’s, listed with their dates in the sources above; quote the agency, link the explainer.

This article is general information and analysis, not investment, tax or legal advice; read the financial disclaimer. Spotted an error? Corrections are made on the page and logged on the corrections page — tell the editor.