Understanding How Mortgage Interest Rates Are Determined
Your rate isn't invented by your lender and it isn't set by the Fed. It's the product of two things: what bond investors demand, and how risky your specific loan looks to them.
By Saman Khanian
Mortgage Professional
Two markets, one rate
The short answer
Your rate is a market price, then adjusted for your risk.
Mortgage rates start in the bond market. Lenders fund loans and sell them to investors — often bundled into mortgage-backed securities. The yield those investors demand sets the baseline rate available that day.
Then your own file moves that baseline up or down: credit score, down payment, loan amount, property type, occupancy and debt-to-income all carry adjustments. A lender's rate sheet is, in effect, the market price plus a stack of personal risk add-ons.
Understanding which part is market and which is you is useful: you can't control Treasury yields, but you can often control several hundredths of a percent — or more — through the choices in your file.
Market forces
Six market forces that set the baseline rate
You can't negotiate these — but knowing them explains why your quote changes from one day to the next.
Treasury yields
Mortgage rates track longer-term Treasury yields closely — especially the 10-year note. When bonds sell off and yields rise, mortgage rates usually follow.
Mortgage-backed securities
Most loans are sold to investors as MBS. Higher demand from investors pushes mortgage rates down; selling pressure pushes them up.
Inflation
Inflation erodes the value of future payments, so investors demand higher yields when inflation is elevated — pulling mortgage rates higher.
Economic data
Jobs reports, CPI, retail sales and GDP surprises move bond markets within minutes. Strong data often lifts rates; weak data often lowers them.
Global events
Geopolitical shocks usually push investors toward safe assets like Treasuries, which can push mortgage rates down — temporarily.
Lender competition & capacity
Lenders price to manage volume. When market demand is high they raise rates or tighten criteria; when demand is low they compete harder on pricing.
The Fed
The Fed doesn't set mortgage rates — but it moves them
The federal funds rate is the rate banks charge each other for overnight loans. Mortgage rates are long-term and are set by bond investors looking years ahead.
Where the Fed matters is expectations. A Fed signal that inflation is cooling can lower long-term yields before any rate cut; a hawkish tone can push them up. The market moves on what the Fed is expected to do next, not only what it did today.
Common mix-up
What people often assume
"The Fed cut rates, so my mortgage rate will drop by the same amount."
What actually happens
Mortgage rates may fall modestly, rise, or not move at all — depending on what bond markets expected before the announcement and what the Fed signalled about the future.
Rule of thumb: watch the 10-year Treasury, not just the Fed headline.
Your file
Eight factors you bring to the pricing
Lenders apply adjustments to the market baseline based on your specific loan. These are the ones that usually matter most — and which of them you can change.
Credit score
HighThe single largest personal lever. Lenders price in tiers, and the top tiers generally start around 740–780. A modest improvement can unlock a meaningfully lower rate.
Down payment / LTV
HighA larger down payment lowers your loan-to-value ratio and the lender's exposure. Below 80% LTV often means a lower rate and less mortgage insurance.
Loan type & term
HighFHA, VA, conventional, jumbo and Non-QM are priced differently, and 15-year terms typically carry lower rates than 30-year terms.
Occupancy
MediumPrimary residences get the best pricing. Second homes and investment properties carry add-ons because the borrower is less tied to the property.
Debt-to-income
MediumA high DTI signals less room to absorb a financial shock. It can push your pricing tier up or push you below a program's limit.
Property type
MediumCondos, multi-unit buildings and non-warrantable properties can carry add-ons. A standard single-family home is the cheapest to underwrite.
Loan amount
Low–MediumVery small loans and jumbo loans are priced differently from standard conforming amounts, reflecting origination cost and investor demand.
Cash reserves
Low–MediumDocumented reserves can offset a thinner profile and sometimes improve a pricing exception for a borderline file.
Locks & points
The rate you get isn't fixed until you lock it
Between application and closing, the market moves. Locking is the main way to control that risk — and points are how you trade upfront cost for a lower rate.
Rate lock
Protects your quoted rate for a set period — commonly 30, 45 or 60 days. If rates rise, your locked rate holds; if they fall, you generally keep the locked rate.
Float
No lock. Your rate is set closer to closing at whatever the market is then. More upside if rates fall, more risk if they rise.
Float-down option
Some lenders allow a one-time drop if rates fall significantly after locking, usually for a small fee or higher initial rate.
Extension
If closing slips past your lock, an extension may be available for a fee — and at the worse of the two rates.
Points & credits
Discount points
Paid upfront to lower your rate, with the break-even measured in months.
Lender credits
The opposite: take a slightly higher rate and have the lender cover some closing costs.
Origination fees
The lender's own charge — always compare the full fee stack, not just the rate.
Third-party costs
Appraisal, title, escrow and recording — these don't change your rate but do change your cost.
One point = 1% of the loan amount. Break-even is decided by how long you keep the loan — not by the rate alone.
Apply NowReading a rate
The anatomy of your quoted rate
Every rate quote is five layers stacked on top of each other. Knowing which layer you're negotiating is how you compare offers properly.
Compare APR, not just rate. The annual percentage rate folds in fees and points, which makes two offers with the same rate but different costs easy to compare.
One number tells the story: cost over the life of the loan. Rate × years + upfront cost is a simpler comparison than any single quoted figure.
Apply NowFrequently asked questions
What borrowers ask us most about rates.
What to watch for
Mistakes that raise the rate
Most borrowers don't pay a higher rate because of the market. They pay it because of a preventable decision during the process.
Avoidable rate increases
- Opening new credit cards or financing a car before closing
- Not locking while the market is moving against you
- Shopping only on rate, ignoring points and fees
- Late documentation that pushes closing past the lock
- Changing loan structure close to closing
- Letting an offer from one lender expire before comparing
What actually helps
- Improve your credit score before applying, not during
- Document income and assets completely and early
- Compare the full cost — rate, points and fees together
- Lock when the rate fits your budget, not when it feels perfect
- Ask your loan officer how a rate change would affect your payment
Written by
Saman KhanianMortgage professional at Equitable Lending, helping buyers understand pricing and choose the right loan across Los Angeles and nationwide.
Want to know what rate your file would get today?
Tell us your credit range, down payment and the home you're considering. We'll show you the rate you'd realistically get — and what would move it.
Free, no-obligation review · NMLS 1124483 · DRE 01941713