Why the Fed Rate Isn't Your Mortgage Rate

The Federal Reserve doesn't set your mortgage rate. On September 16, 2026, the Fed's Federal Open Market Committee voted 12–0 to raise its benchmark federal funds rate by a quarter point — "to 3-3/4 to 4 percent," in the committee's own words (Federal Reserve). Yet that single decision did not directly produce the rate on your new home loan. Mortgage rates are set by the bond market, and above all by the 10-year Treasury yield, so waiting on the Fed's every meeting can cost you while the rate you'll actually be quoted moves on a completely different clock.

I'm Jay Sondhi, a mortgage loan officer in Oakland and San Francisco. The most common question I get after any Fed announcement is some version of "did rates just drop?" The honest answer is often no — because the rate you're quoted doesn't follow the Fed announcement. It follows the 10-year Treasury yield, which shifts every trading day.

Why the Fed's rate isn't the rate you're quoted

The federal funds rate is the overnight interest rate that depository institutions charge each other for reserve balances. It governs short-term bank-to-bank lending, which means it moves products like credit cards, auto loans, and home equity lines far more directly than it moves a 30-year mortgage. The Fed raises or lowers it to steer the economy — to cool inflation or to spur growth — but it has no direct say over the number a lender quotes on a fixed-rate home loan.

That distinction shows up clearly on a chart. The federal funds rate and the 30-year mortgage rate move in similar directions over long stretches, but they are not the same line — the mortgage rate almost always sits higher.

The 10-year Treasury yield is the real driver

The 10-year Treasury yield is the annual return the U.S. government pays investors who buy bonds that mature in a decade. Why does a government bond set your home loan rate? Because a 30-year mortgage is rarely held for 30 years — most borrowers refinance, sell, or pay off the loan in about eight years. So investors who buy mortgage-backed securities calculate their return over roughly a decade, making the 10-year Treasury the closest comparable "risk-free" investment.

When demand for Treasuries rises, their yields fall — and mortgage rates tend to follow. When investors worry about inflation or growth, yields rise, and mortgage rates creep up. Chase explains that "Lenders often reference 10-year U.S. Treasury bonds when setting mortgage rates for 30-year mortgages because of similarities in their economic activity" (Chase).

The spread: why rates don't fall as fast as the Fed cuts

Mortgage rates don't simply equal the 10-year Treasury yield — they carry an extra cushion called the mortgage spread. This is the gap between the 30-year fixed mortgage rate and the 10-year Treasury yield, and it exists because a home loan is riskier than a government bond. Lenders build in compensation for borrower default risk, early payoff, and the day-to-day cost of servicing the loan.

Historically that spread is narrow. The Mortgage Bankers Association (MBA) reports that between 1990 and 2021, the spread averaged around 170 basis points (a basis point is one-hundredth of a percentage point), but starting in 2022 it widened dramatically, exceeding 300 basis points in some weeks (MBA). During that period, Treasury yields rose around 300 basis points between early 2022 and late 2023, yet mortgage rates climbed by over 400 basis points because of the wider spread — rates reached weekly averages near 8% (MBA). That lag is a big reason a Fed move doesn't instantly become cheaper borrowing for you.

Here's the practical effect: when the Fed cuts, the market may already have priced that cut into the 10-year Treasury weeks earlier. So on the day of the announcement, mortgage rates may barely budge — and in the days between meetings they move constantly as the yield and the spread both shift.

This is why consumers see mortgage rates move on days the Fed doesn't meet at all. A jobs report, an inflation print, or nervous global markets can shift the Treasury yield a few basis points (a basis point is one-hundredth of a percentage point) in a single morning, and lenders adjust quoted rates accordingly.