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Mortgage Rates vs. Bond Yields: Why Is the Gap So Wide?

The 10-year Treasury yielded 5.17% in late September 2026, while the 30-year mortgage index stood at 7.43%. See how Treasury, municipal, corporate and mortgage bonds compare—and why the spread between bond yields and your mortgage rate matters.
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Bond Yields and Mortgage Rates: What’s the Spread?

The 10-year Treasury is at 5.17%. The 30-year mortgage index is at 7.43%. Here is the simple connection—and what the difference means for your payment.

As of late September 2026. Yields and mortgage rates change daily.

Bond yields, at a glance

These examples show government, state/local municipal, corporate and mortgage bonds. The 10-year Treasury is the key mortgage comparison because many 30-year loans are paid off or refinanced in roughly seven to ten years.

Bond or rateYield / rate
1-month Treasury bill4.04%
3-month Treasury bill4.24%
6-month Treasury bill4.33%
1-year Treasury4.50%
2-year Treasury4.81%
5-year Treasury4.98%
10-year Treasury5.17%
20-year Treasury5.54%
30-year Treasury5.49%
10-year AAA municipal bond (state/local, generally federal tax-free)3.72%
30-year AAA municipal bond4.87%
AAA corporate bond index5.70%
BBB corporate bond index6.08%
BB high-yield corporate bond index6.64%
B high-yield corporate bond index7.87%
Fannie Mae 30-year mortgage bond (MBS) current coupon6.10%
Ginnie Mae 30-year MBS current coupon6.05%
30-year fixed mortgage index (borrower rate)7.43%

Treasuries: September 25, 2026. AAA municipal bonds and MBS current coupons: September 21, 2026. Corporate index yields: September 24, 2026. Mortgage News Daily rate index: September 25, 2026. These different dates and instruments are comparisons, not directly interchangeable investments.

The spread between the 10-year and mortgage rates

The spread is simply the mortgage rate minus the 10-year Treasury yield. It reflects mortgage-bond investor costs and risks, plus the costs and margins between the bond market and a borrower’s loan.

Normal historical spread · 2000–2019 average
~1.70 points

5.17% Treasury + 1.70 points = ~6.87%

Late September 2026 spread
~2.26 points

5.17% Treasury + 2.26 points = 7.43%

What to tell your audience: At the same 5.17% Treasury yield, a normal historical spread points to about 6.87% instead of 7.43%. The roughly 0.56-point difference is in the spread. This is an illustration, not an available loan quote or a prediction.

Mortgage payment calculator

Enter a home price and down payment to see estimated principal and interest. Tap either spread example to compare the monthly payment using the same 10-year Treasury yield.

Estimated monthly principal & interest$2,222.17
Loan amount
$320,000.00
Total interest over selected term
$479,980.50

Estimate excludes property taxes, homeowners insurance, mortgage insurance, HOA dues and closing costs. The two preset rates are market illustrations, not loan offers.

Compare 30+ mortgage lenders with one application and one credit pull at therateupdate.com.

Sources

U.S. Treasury yields: Forbes Advisor, Treasury Rates, September 25, 2026. Mortgage rate and 10-year comparison: Mortgage News Daily, September 25, 2026. AAA municipal bonds and agency MBS current coupons: Raymond James Weekly Interest Rate Monitor, September 21, 2026. Corporate index effective yields: ICE BofA indices via FRED, September 24, 2026. Typical spread: approximate 2000–2019 average supplied for this article.

* Specific loan program availability and requirements may vary. Please get in touch with your mortgage advisor for more information.