How Mortgage Rates Are Set: The Fed, the 10-Year, and the Spread

The Federal Reserve does not set mortgage rates. It sets an overnight rate that banks charge each other, and mortgage rates follow a different number, the yield on the 10-year Treasury, plus a spread that widens and narrows on its own. Buyers who watch the Fed and expect their rate to move the next day are watching the wrong screen. This guide shows the real chain with the current figures, all dated, and what it means for a Central Oregon purchase.

Three numbers, in order

The federal funds rate. As of the Federal Open Market Committee's July 29, 2026 statement, the target range is 3.50% to 3.75%, unchanged since December 11, 2025. Since September 2024 the Fed has cut six times for a total of 1.75 percentage points, from a range of 5.25% to 5.50%. Source: the Federal Reserve's open market operations table.

The 10-year Treasury yield. On September 3, 2026 it closed at 4.77%, and it averaged 4.60% over the prior ninety days, per the Federal Reserve's daily series on FRED. This is the number mortgage rates actually track, because a 30-year mortgage is typically paid off or refinanced in well under ten years, and investors price it against the ten-year bond.

The 30-year mortgage rate. Freddie Mac's national average was 6.71% for the week of September 3, 2026. The difference between that and the Treasury yield is the spread: 1.94 percentage points that week. We computed the average spread from the first week of 2000 through September 2026, weekly mortgage rate minus the same-week Treasury yield, and it is 1.89 points. So the spread is close to its long-run average right now. In late 2023 it was not: on October 26, 2023 the mortgage rate peaked at 7.79% while the Treasury had peaked a week earlier at 4.98%, a spread near 2.8 points.

Why the Fed cutting did not cut your rate

The Fed cut 1.75 points between September 2024 and December 2025. Freddie Mac's annual average 30-year rate went from 6.72% in 2024 to 6.60% in 2025, a move of twelve hundredths of a point. The reason is that the 10-year yield is set by investors' view of inflation and growth over a decade, and the Fed's overnight rate is one input among many. When the Fed cuts because the economy is weak, long yields often fall ahead of the cut. When it cuts while inflation is still a question, long yields can hold or rise. 2025 was the second kind of year.

The history says the same thing. In 2019 the Fed cut three times, in August, September, and October. The mortgage rate had already fallen from 4.51% in the first week of January to 3.74% by the last week of December, and most of that drop came before the first cut. In the 2007-08 cycle the Fed went from 4.75% in September 2007 to a range of zero to 0.25% in December 2008, and the mortgage rate went from 6.46% to 5.53%, less than a point, while the Fed cut more than four.

What would actually move your rate

Two things. The 10-year yield falling, which happens when investors expect slower growth or lower inflation, and the spread narrowing back toward its long-run average when bond investors are less worried about prepayment and volatility. The spread is already near average, so the room there is small. The yield is the lever, and nobody prices it well in advance, including the people paid to.

What it means for a Central Oregon buyer

Do not wait for a Fed meeting to lock. The mortgage market prices expected cuts in before they happen, so the announcement itself rarely moves the rate the way people expect. Lock when the payment works. Watch the 10-year if you want a leading indicator, and read it as direction, not a forecast. And remember the local math: at Bend's ninety-day median of $733,000 as of September 7, 2026, a one-point change in the rate moves the payment on an 80% loan by about $386 a month. Our guide to what rates do to a Bend payment runs the full table.

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