Why the Fed cutting rates doesn't lower your mortgage

The Federal Reserve cuts rates. The headlines say borrowing just got cheaper. You check mortgage rates the next morning and nothing has moved — or worse, they have gone up.

This is not a delay, and nobody is holding out on you. The Fed does not set your mortgage rate, and the thing that does was already moving before the announcement.

What the Fed actually sets

The Fed sets the federal funds rate — an overnight rate, for banks lending to each other for a single night. It flows fairly directly into things priced off short-term money: credit cards, car loans, HELOCs, savings accounts.

A thirty-year mortgage is not short-term money. It is priced against something else entirely, and the connection between the two is loose enough that they routinely move in opposite directions.

The clearest recent demonstration: between September 2024 and January 2025 the fed funds rate fell by roughly 80 basis points while the 10-year Treasury yield rose by about 90. Anyone who had been waiting for a Fed cut to go shopping watched their buying power shrink through a rate-cutting cycle.

What actually sets it: the 10-year Treasury

Mortgage rates track the 10-year Treasury yield.

The reason is duration. A thirty-year mortgage is almost never held for thirty years — people move, refinance, pay off. The average life is somewhere around seven to ten years, which makes a ten-year government bond the closest comparable instrument.

And the two genuinely compete. A pension fund choosing between government bonds and mortgage debt weighs one against the other, so when Treasury yields rise, mortgage rates must rise to stay attractive. When yields fall, mortgage rates follow.

Which is why the 10-year Treasury is in the bar at the top of every page on this site. It is the number that tells you where mortgage rates are heading, and it moves daily while mortgage rates are surveyed weekly.

The spread, and what it tells you

The gap between the 30-year mortgage rate and the 10-year Treasury is the spread, and it is the third figure in that bar.

It is not a margin anyone pockets. It compensates investors for two things a Treasury bond does not carry:

Credit risk. The US government is assumed not to default. A borrower might.

Prepayment risk. This one is underappreciated and is most of the spread. If rates fall you refinance, and the investor's high-paying asset disappears exactly when they can only reinvest at a lower rate. If rates rise you keep the loan forever, and their money is stuck below market. The option works against them in both directions, so they charge for it.

Historically the spread sits somewhere around 1.5 to 2 percentage points. It compresses when markets are calm and demand for mortgage debt is strong. It blows out — past 3 points in 2008 and again in the 2022–23 tightening cycle — when volatility rises and investors want more compensation for uncertainty.

That matters to you in a specific way. When the spread is wide, mortgage rates are high relative to where Treasuries say they should be, which means there is room for rates to improve even if Treasury yields go nowhere. When it is narrow, mortgage rates are already about as good as the bond market allows, and improvement has to come from Treasuries themselves.

You can watch all three on the rates page — 30-year, 15-year, 10-year Treasury, and the spread between them, updated hourly from the Federal Reserve Bank of St. Louis.

What this means if you are buying

Do not time a purchase around a Fed meeting. Whatever the Fed does is largely priced into the bond market before the announcement. The move you are hoping for has usually already happened, or has not.

Watch the 10-year, not the headlines. It moves daily. If it is trending down over weeks, mortgage rates follow with a lag. If it is climbing, no amount of Fed commentary changes what you will be quoted.

A weekly average is not a quote. The figure in the header is Freddie Mac's national survey. Your rate depends on your credit, your down payment and the property, and on a clean file it is often better than the average.

Rate is one variable among several. A quarter point on a $450,000 loan is roughly $74 a month. A MUD district can be $344. A builder's incentive can be worth $15,000 at closing. People spend months chasing an eighth of a point and sign the district disclosure without reading it.

The honest summary: nobody knows where rates are going, anyone who says otherwise is selling something, and the variables you can actually control — which lender, which structure, which house, which district — are worth more than the one you cannot.

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The figures in the site header are Freddie Mac's Primary Mortgage Market Survey and Treasury constant-maturity yields, both published by the Federal Reserve Bank of St. Louis. They are national averages, not a quote, and not the rate you would be offered.

Sources: Federal Reserve Bank of Atlanta — Not Joined at the Hip: The Relationship between the Fed Funds Rate and Mortgage Rates · FRED — 30-Year Fixed Rate Mortgage Average · FRED — 10-Year Treasury Constant Maturity