Every time I quote a borrower a rate, I get the same follow-up question: "But the Fed didn't cut yet — why is my rate this high?" 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 — and a meaningful percentage of loan officers — have never had explained properly.
Mortgage rates aren't a single published number. They're an output of six specific inputs against today's bond market. If a lender shows you a single rate without telling you what assumptions sit behind it, they're either testing how gullible you are or hoping you won't notice when the locked rate comes in higher.
Here's what actually determines your rate — and what to ask a lender to see your real number.
Why mortgage rates don't move when the Fed moves
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, but that's another article). The 10-year Treasury is set by tens of thousands of bond traders pricing in their expectations for inflation, economic growth, and Fed behavior over the next decade.
The Fed funds rate is an overnight rate. It directly affects credit cards, HELOCs, and short-duration commercial paper. 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 Fed announcement happens, the bond market has usually already moved.
This is the part of mortgage math nobody bothers to teach borrowers, and it's why every "rates dropped today because the Fed cut" headline misses the point.
"Waiting for the Fed to cut so your mortgage rate drops is like waiting for the weather forecast to change before deciding what to wear. The market already saw it coming."
What actually determines your mortgage rate
Six inputs. Every single mortgage rate quoted to a borrower is a function of these six variables interacting with the current bond market. If you understand them, you understand mortgage pricing better than most people who originate loans for a living.
| Input | What It Affects | Approx. Rate Impact |
|---|---|---|
| Credit score | Lender's pricing of default risk | 740+ vs 680: ~0.625% |
| Down payment | Loan-to-value ratio + PMI requirement | 20% vs 5%: ~0.25% + PMI |
| Loan size | Conforming vs jumbo execution | Conforming vs jumbo: ~0.125–0.375% |
| Occupancy | Primary, second home, or investment | Investment property: +0.75–1.25% |
| Points paid | Prepaid interest to buy down rate | 1 point paid: ~−0.25% rate |
| Lock period | How long the rate is locked pre-close | 60-day vs 15-day: +0.125% |
Two of these inputs are within your control today (down payment and points). Three are within your control over months (credit score, loan size, occupancy choice). One is purely timing (lock period). Every quote you've ever received from a lender is a specific combination of these six against this morning's bond market.
If you're planning a move-up or first-home purchase and want to understand how each input affects your specific scenario, I cover the down-payment-side math in detail in the down payment math piece.
What about VA, FHA, and other government-backed loans?
Government-backed loans (VA, FHA, USDA) follow the same six-input framework but with different pricing curves. VA loans, in particular, are priced separately because they're backed by the Department of Veterans Affairs guarantee — which makes them less risky for the lender and typically prices them 0.25–0.50% below conventional. Add the "no PMI ever" benefit, and a VA loan is often the cheapest mortgage available to a borrower who qualifies.
FHA loans, on the other hand, are priced competitively on the rate itself but carry mortgage insurance (MIP) for the life of the loan unless you refinance out. That structural cost is often missed in rate comparisons. For a deeper look at when a VA borrower is leaving money on the table, see the post on VA funding fee exemptions.
What to ask a lender to see your real rate range
You can't get a real rate quote from a published page. You can get an accurate range from any honest loan officer in about three minutes. Here are the four specific questions that get you the real number:
- "What's my rate range given my specific credit score, down payment, and loan size?" A range, not a number. The range itself is the honest answer.
- "What does it cost in points to get to the lower end of that range?" Points are prepaid interest. The math on whether they save you money depends on how long you'll keep the loan.
- "What are your lender fees, in dollars, on a quote sheet I can keep?" APR is meaningless without seeing the underlying fees. Get them in writing before applying.
- "What's your lock policy if rates drop between today and my closing date?" Some lenders offer free or low-cost float-down options. Others lock you in and pocket the difference if rates drop.
If a lender refuses to give you a range, refuses to itemize fees, or pushes you toward a hard credit pull before showing you any of this, that's not how a good loan officer operates. Walk away.
The bottom line
Mortgage rates are a function of bond market expectations, lender risk pricing, and your specific borrower profile. 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 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. And if the math says you should wait, I'll tell you that too. I've covered the wait-or-refi math in detail in the refinance break-even post — worth reading before you commit either way.
