The 30-year fixed mortgage rate averaged 6.65 percent in Freddie Mac's Primary Mortgage Market Survey released August 20, 2026, while the 10-year Treasury par yield closed at 4.65 percent on August 19, 2026, per the US Treasury. The gap is 200 basis points. That gap, not the Federal Reserve, is what a borrower pays above the risk-free benchmark.
This is information about how mortgage pricing works, not investment advice. The figures below are published survey and market data for specific dates; they are not forecasts, and nothing here is a recommendation to borrow, refinance, buy, or sell.
What is the mortgage spread?
The mortgage spread is the difference between the prevailing 30-year fixed mortgage rate and the yield on the 10-year Treasury note. On the two dates above it was 200 basis points. A basis point is one hundredth of a percentage point, so 200 basis points is two full percentage points of interest. The Treasury publishes the benchmark yield each business day in its Daily Treasury Par Yield Curve Rates series.
The 10-year Treasury is the reference because a 30-year mortgage is not held for 30 years. Borrowers move or refinance, so the cash flows of a mortgage pool behave more like a 10-year instrument than a 30-year one.
The spread is not a fee anyone charges. It is a residual: what is left after the market prices everything that makes a mortgage riskier to hold than a Treasury.
Why is there a gap at all?
The single largest structural reason is the prepayment option. A US borrower can repay a fixed-rate mortgage at any time without penalty, and that right belongs to the borrower rather than the investor who funds the loan.
Paul S. Willen of the Federal Reserve Bank of Boston set out the mechanism in a Current Policy Perspectives paper published May 19, 2026. When rates fall, borrowers refinance and the investor's high-coupon asset disappears. When rates rise, borrowers stay put and the investor is stuck holding a below-market asset. As the paper puts it, "borrowers win in both scenarios; investors lose in both."
Investors price that asymmetry in advance. The compensation they demand shows up as the spread, and it is charged to every borrower in the pool, including those who never refinance.
What makes the spread move?
Willen's paper identifies three measurable drivers and reports that together they "explain approximately 80 percent of the variation in the coupon spread since 2006." Each has a stated direction and magnitude in the paper.
| Driver | Change | Reported effect on the spread |
|---|---|---|
| Yield curve slope (10-year minus 2-year Treasury) | Steepens by 1 percentage point | Narrows by about 40 basis points |
| Interest rate volatility (swaption implied volatility) | Rises by 10 basis points | Widens by about 15 basis points |
| Refinancing costs | Measured via originator intermediation margins | Direction stated, magnitude not summarized here |
Volatility is the driver that surprises people. It is not the level of rates that widens the spread but the uncertainty about where they go next, because uncertainty is what makes the borrower's free option expensive.
The range is wide over time. The paper describes the gap between the primary mortgage rate and the 10-year Treasury yield as having "varied dramatically since 2000, ranging from more than 300 basis points during the 2007–2009 financial crisis to less than 100 basis points in 2021." On the narrower measure the paper uses for its decomposition, the coupon spread "stood at just 46 basis points" in October 2021.
What does 200 basis points cost in monthly payments?
The following is an illustration built on the two published rates above and a stated set of assumptions, not a loan quote and not a prediction. Assume a $300,000 loan, fully amortizing over 360 months, fixed rate, no points, taxes and insurance excluded. The 4.65 percent line is a hypothetical benchmark payment only: no mortgage is available at the Treasury yield, and none is offered at it.
| Rate used | What it represents | Monthly principal and interest |
|---|---|---|
| 6.65 percent | PMMS 30-year average, August 20, 2026 | $1,926 |
| 4.65 percent | 10-year Treasury par yield, August 19, 2026 | $1,547 |
| Difference | The 200 basis point spread | About $379 |
On the same assumptions, a 25 basis point move costs or saves roughly $50 a month, about $594 over a year. That is the practical scale of a quarter-point for a single financed unit at this loan size.
The comparison is arithmetic on two published figures for two nearby dates. It is not a claim that either rate will move.
Does the survey rate apply to a rental property?
Not directly. Freddie Mac's published methodology states the survey covers weekly conventional, single-family originations within conforming loan limits, drawn from purchase applications submitted to Loan Product Advisor, for borrowers with good to excellent credit making 20 percent down payments on owner-occupied, single-family properties.
Every one of those qualifiers matters to a landlord. Owner-occupied is the binding one: a loan on a property the borrower does not live in falls outside what the survey measures.
PMMS is therefore a benchmark for the direction and level of the conforming market, not a quote for any specific borrower. Where investor-property pricing sits relative to the survey average is a question the survey itself does not answer, and no figure in the sources cited here supplies it.
Can a borrower change the rate inside the market's rate?
Partly, and the mechanism is disclosed rather than negotiated in the dark. The Consumer Financial Protection Bureau describes the tradeoff: "Points lower your interest rate, in exchange for paying more at closing. Lender credits lower your closing costs up front, in exchange for a higher interest rate."
One point equals one percent of the loan amount, so one point on a $100,000 loan costs $1,000, per the CFPB. The bureau also states that the size of the rate reduction "depends on the specific lender, the kind of loan, and the overall mortgage market" — there is no fixed exchange rate between points and basis points.
In the bureau's own example, a $180,000 loan quoted at 5.0 percent with zero points becomes 4.875 percent for about $675 more at closing, saving roughly $14 a month; taking about $675 in lender credits instead raises the rate to 5.125 percent and the payment by roughly $14. Those are the CFPB's illustrative figures, not current market pricing.
What the spread does not tell you
The spread explains why mortgage rates sit above Treasury yields. It says nothing about whether a particular property pencils, what a specific lender will quote, or where rates go next.
It is also a national, conforming, owner-occupied measure. It does not capture jumbo pricing, portfolio lending, commercial terms, or any state or local rule that affects what a landlord can charge or collect.
Read as a diagnostic, it does one useful thing: it separates the part of a mortgage rate that comes from the bond market from the part that comes from the option embedded in every American fixed-rate loan. When the headline rate moves and the Treasury does not, the answer is in the spread.
For a related business news perspective, read What a 6.65 Percent Mortgage Rate Does to Small-Landlord Math.