Every time the Fed meets, I get the same email from clients: "Should I wait? They're about to cut rates, right?" And every time, I have to explain the same uncomfortable fact — the Federal Reserve does not set your mortgage rate. They influence it. Loosely. With a lag. Through a mechanism most homebuyers have never had explained properly.
The December meeting confirmed what bond traders had already priced in three weeks earlier: a hold on the federal funds rate, with hawkish commentary suggesting fewer 2025 cuts than the September dot plot implied. Mortgage rates moved up that afternoon — even though the Fed didn't touch a thing.
This is the part nobody explains. So let me.
The rate you pay is set by the bond market, not the Fed
Your 30-year fixed mortgage rate is functionally priced off the 10-year Treasury yield, plus a spread (currently around 2.4 percentage points — historically wide, by the way, but that's another article). The 10-year Treasury is set by tens of thousands of bond traders pricing in their expectations for inflation, growth, and Fed behavior over the next decade.
The Fed funds rate is an overnight rate. It affects credit cards, HELOCs, and short-duration commercial paper directly. Mortgages? They're influenced indirectly through the 10-year, and the 10-year cares more about expected Fed policy than actual Fed policy. By the time the announcement happens, the market has usually moved already.
"Waiting for the Fed to cut so your mortgage rate drops is like waiting for the weather forecast to change before you decide what to wear. The market already saw it coming."
What actually moved rates this month
Three things, in order of impact: November CPI coming in 0.1% hotter than expected, a stronger-than-forecast jobs report on December 6th, and the FOMC's updated dot plot showing only two projected cuts in 2025 (down from four in September).
None of these are the Fed funds rate decision itself. All of them moved mortgage rates more than the December 18th announcement did. If you were waiting for the meeting to "lock in lower," you watched 30-year rates climb from 6.71% to 7.02% over the two weeks leading up to it.
What this means for borrowers right now
If you're sitting on the sidelines waiting for rates to drop into the 5s based on Fed forecasts, here's the honest math: even the most aggressive cut scenarios (75-100 bps in 2025) would likely move 30-year mortgage rates by 40-60 bps at most. The bond market has priced in most of that already. The remaining surprise upside on rates is smaller than most people think.
What you can do, in order of practical impact:
- Get pre-qualified now at today's rate. You can always renegotiate the rate at lock — but you can't renegotiate the time you spent waiting.
- Ask your loan officer about a float-down option if you find a property. Most lenders offer one for a small fee (or free, depending on the relationship). It lets you lock today and catch the upside if rates drop before closing.
- Run the 2-1 buydown math. If you're buying with a seller credit, a temporary buydown can knock 2 points off your year-one rate. The savings are real, the structure is misunderstood, and not every loan officer will offer it without being asked.
- Stop waiting for the Fed to fix this. The Fed isn't going to fix it. The bond market will eventually, but on its own schedule, and you'll know about it three days after it already happened.
The bottom line
Mortgage rates are a function of inflation expectations, Treasury supply, and the Fed-MBS spread. They are not a function of "what the Fed did this week." If a loan officer or article tells you otherwise, that's a reading-comprehension problem, not a market problem.
If you've got a specific scenario — purchase, refi, locked in something painful in 2023, holding off on a move because "rates" — send me your numbers. I'll run the math against today's market and tell you what's actually true for your situation, not what the headlines suggest.
