30-Year vs 15-Year Fixed Rate Spread — September 20, 2026}

Current Spread Snapshot

As of the latest FRED release dated September 17, 2026, the national average 30-year fixed mortgage rate stands at 6.95% while the 15-year fixed rate is 6.26%, producing a 69-basis-point spread. That spread is 2 basis points wider than the 0.67% average recorded for 2026 year-to-date.

Weekly and Yearly Context

Freddie Mac’s Primary Mortgage Market Survey for the week ending September 10, 2026, pegged the 30-year fixed at 6.76% and the 15-year at 6.09%. One year earlier, the same survey showed 6.35% and 5.94%, respectively. The 30-year rate has therefore risen 41 basis points year-over-year, while the 15-year has climbed 32 basis points.

Payment Comparison Table

Term	Rate	Monthly P&I*	Total Interest**
30-yr	6.95%	$1,321	$275,560
15-yr	6.26%	$1,711	$107,980

*Payment on a $200,000 loan, principal & interest only.

**Total interest paid over full term.

Treasury Anchor and MBS Dynamics

The 10-year Treasury yield closed at 4.94% on September 17, 2026, leaving a 201-basis-point gap between the 30-year mortgage and the benchmark Treasury. Mortgage-backed securities pricing has remained range-bound, keeping the spread between 30-year and 15-year loans relatively stable despite the higher absolute rate environment.

Regional Rate Dispersion

Although national averages dominate headlines, local pricing can vary. In the Dallas-Fort Worth metro, lenders are quoting 30-year fixed rates 4–7 basis points below the national average, while the San Francisco metro shows quotes 9–12 basis points above. The 15-year spread between these two markets is narrower—roughly 5 basis points—because shorter-term products are less sensitive to local credit overlays.

Break-Even Analysis

Borrowers weighing the 15-year versus 30-year decision typically focus on the monthly payment delta of $390 on a $200,000 loan. At that differential, the cumulative savings from the lower 15-year rate surpass the higher payment after 7 years and 4 months. Homeowners who plan to stay in the property beyond that horizon generally come out ahead with the shorter term, provided cash flow allows.

Rate Outlook and Lock Strategy

With the 30-year fixed averaging 6.76% as recently as September 10 and now sitting at 6.95% per FRED, volatility remains elevated. Borrowers who run live scenarios at HomeRates.ai can test multiple rate-lock windows against their personal break-even timelines.

Bottom Line

At today’s 69-basis-point spread, the 15-year fixed carries a clear long-term cost advantage for those who can absorb the larger monthly outlay. Homeowners expecting to remain in the property for eight or more years should model both options on current quotes before choosing the longer amortization.