The 10-Year Treasury isn’t the only thing that drives mortgage rates but it’s a big one. If the Fed signals that inflation is under control, lenders might tighten the spread over the 10-Year Treasury, which could mean lower rates for homebuyers.
Where We Are Today (Feb 9, 2026):
- 10-Year Treasury: 4.203%
- 30-Year Treasury: 4.853%
- 30-Year Fixed Mortgage: ~6.16%
That puts the bank mortgage–10-Year spread at roughly 1.95–2.00% pretty normal lately. (It can spike to 2.2–2.5% when markets get stressed.)
The Mortgage spread is the difference between the interest rate a lender charges on a mortgage and the yield on a benchmark, usually the 10-Year Treasury bond.
If lenders keep mortgages priced about 2% over the 10-Year Treasury the 10-Year Treasury would need to drop to ~3.95–4.00%. That would typically give 30-year mortgage rates around 5.90–6.00%. To stay under 5.99%, the 10-Year Treasury needs to stay comfortably below 4%, not just dip for a day
Rule of Thumb:
10-Year at 3.95% ≈ 5.9% mortgage
If Spreads Tighten (Best-Case, Calm Markets)
Sometimes, bond volatility drops and mortgage-backed security (MBS) spreads improve usually when inflation cools and the Fed’s plans look steady. In that case, spreads could tighten closer to pre-2008 levels (~1.7%).
- With spreads around 1.75–1.85%, a 5.99% mortgage could happen even if the 10-Year Treasury is a bit higher, around 4.05–4.10%
This usually requires: Softer inflation numbers. Stable or falling oil prices. And, No surprise hawkish moves from the Fed
The 10-Year Treasury sets the tone, but spreads, inflation, and Fed signals all matter. Watching these factors can give you a better idea of where rates might go and when it could be a good time to lock in a mortgage.
