Every time the Federal Reserve meets, I can count on the phone in my office to start ringing. On the other end are clients who saw a headline about the Fed and want to know whether the rate on the house they are buying just went up, down, or sideways. It's one of the most reasonable questions a person can ask, and the answer is almost never what they expect. The Fed does not directly change their mortgage rate. That rate is set in a different market altogether.

This confusion is worth clearing up, because it drives real decisions. Buyers wait for a Fed cut that was never going to help them. Sellers misjudge their timing. Even seasoned business owners, people who read the financial pages closely, tend to treat the federal funds rate and the 30-year mortgage as the same lever. They are not. Understanding the difference explains why the cost of a home loan can rise on the very day the Fed eases.

What the Fed actually controls

The Fed sets a target range for the federal funds rate, which is the rate banks charge one another to borrow money overnight. That single number ripples outward fast: It moves the prime rate, and with it credit cards, auto loans, home equity lines, and most business lines of credit. If you carry a balance that adjusts, the Fed is very much your concern. These are short-term instruments, and short-term money is the Fed's domain.

A 30-year fixed mortgage is a different animal. Rather than staying on the lender's books, most mortgages are bundled with thousands of others and sold to investors as mortgage-backed securities. Those securities compete with other long-term investments, Treasury bonds above all, and their prices are set by investors around the world. The mortgage you sign is ultimately part of a bond that trades in a global market, and that market — not the Federal Reserve — sets the rate a borrower gets. That does not make the Fed irrelevant; its policies shape inflation, growth, and where investors think rates are heading, all of which feeds the bond market. But the effect on mortgages is indirect. Mortgage rates answer to what investors believe is coming, not to what the Fed announces on a given afternoon.

Follow the 10-year Treasury yield

If you want a single number that tracks where mortgage rates are heading, ignore the Fed and watch the yield on the 10-year Treasury note. The relationship isn't perfect, but it's close, and it holds for a sensible reason. Investors treat mortgage bonds and Treasurys as competing places to park long-term money. When Treasury yields climb, mortgage rates have to climb too, or nobody would accept the added risk of a home loan over the safety of government debt.

Why does the 10-year Treasury have such influence, and not the 30-year Treasury, given that the loan runs 30 years? It's because almost nobody keeps a mortgage that long; people sell, they refinance, or they move for work. Depending on the market, a typical mortgage loan is paid off or replaced between seven and 12 years, which makes the 10-year Treasury a better yardstick. This is also why inflation news moves mortgage rates so sharply. Inflation is the enemy of anyone holding a fixed payment over years, since it erodes the value of every dollar that comes back, and a hot inflation report can push rates higher before the Fed even says a word.

The piece almost nobody talks about

Here is where it gets interesting for anyone who ponders the markets. The mortgage rate is not simply the 10-year yield plus a fixed markup. It sits above the yield by a gap the industry calls the “spread”. Lately, the 10-year Treasury yield has hovered around 4.5%, while the average 30-year mortgage is near 6.75%. That gap, more than two full percentage points, is the spread, and it's doing real work.

Part of the spread covers the mortgage lifecycle: originating the loan, guaranteeing it, servicing it, and selling it on. The spread also covers a risk somewhat unique in fixed income; a homeowner can refinance any time rates fall, leaving the investor to reinvest the money at a lower yield. Yet, if rates rise, that same homeowner keeps paying the old low rate for years. The investor bears the downside in both directions. Heads, the borrower wins; tails, the investor loses. Nobody accepts that bet for free, so they demand extra yield, and that premium widens whenever market volatility spikes.

The spread matters because it acts as a second lever on your rate; one that has nothing to do with the Fed, and it can move on its own. In 2023, the spread widened, keeping mortgage rates high even when Treasury yields temporarily eased. The reverse can happen, too. Today's mortgage spread sits above its long-term average of roughly 1.75 percentage points. If it simply drifted back to normal, mortgage rates would fall by around 0.33%, or 33 basis points, with no action from the Fed at all.

Why this should matter to you

When a client tells me they are waiting for the Fed to rescue their rate, they are often waiting for the wrong thing. Rates can improve because inflation cools, because global investors grow hungrier for American bonds, because Treasury yields fall, or because a stretched spread finally relaxes. Any of those can happen while the Fed sits perfectly still. The opposite is just as true, which is why a rate can jump the same afternoon the Fed announces a cut, catching everyone who was watching the wrong number.

The next time a Fed announcement takes over the headlines, don't assume your mortgage rate will move because of it. Watch the bond market instead: the 10-year yield, the inflation reports that move it, and the spread riding on top. That is where the price of a mortgage is really decided, every trading day, long before my phone starts to ring.

Skip Leasure is a senior loan officer at Intercap Lending, in Spokane. He is licensed in Washington, Idaho, and Oregon, and can be reached at [email protected].