Most fixed mortgages are bundled and sold to investors as mortgage-backed securities. The return those investors demand is the real engine behind your rate. When investors want a higher yield, lenders have to offer higher rates to sell the loans, and your quote rises. The 10-year Treasury is the most watched proxy because it moves with the same forces.
Inflation is the biggest lever. When inflation runs hot, investors demand more yield to protect their purchasing power, and rates climb. When the economy cools and inflation eases, yields and rates tend to drift back down.
The Federal Reserve sets the federal funds rate, a very short-term rate banks charge each other overnight. That feeds quickly into variable products like HELOCs and credit cards. The 30-year fixed mortgage rate is a long-term instrument, so it responds less to the Fed's current move and more to where the market expects inflation and growth to go.
This is why mortgage rates sometimes fall on the day the Fed raises, or rise on the day it cuts. The market had already priced in the expected decision and is reacting to the guidance about what comes next.
Once the market sets the floor, your own file decides the rest. Lenders price for risk: a higher credit score, a larger down payment, a primary residence, and a standard loan size all push your rate down. A lower score, a smaller down payment, an investment property, or a jumbo balance push it up.
You can also buy the rate down with points, which are prepaid interest. The question is never the rate in isolation, it is the break-even: how long it takes the lower payment to repay the upfront cost. Run that math before you decide.
Compare offers on APR, not just the headline rate, because APR folds in certain fees and points so two quotes become comparable. When the numbers look right, a rate lock holds the quoted rate for a set window, commonly 30 to 60 days, while your loan is processed.
Rates move all day with the bonds behind them, so timing a lock is partly about removing uncertainty rather than calling the bottom. Lock when the payment works for your budget and you are ready to move forward.
Start a no-pressure conversation about your scenario when you are ready. Educational only, never a sales pitch.
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