Mortgage interest rates are shaped by two broad forces: the overall economy and your personal financial profile. On the macro side, rates track the yield on the 10-year U.S. Treasury note, responding to inflation expectations, Federal Reserve policy, and investor demand for mortgage-backed securities. On the personal side, your credit score, down payment size, loan type, and loan term all shift the rate a lender offers you. Understanding both layers helps you make sense of why rates move and why two borrowers shopping on the same day can get very different quotes.
The 10-Year Treasury Sets the Baseline
The single biggest driver of 30-year fixed mortgage rates is the yield on the 10-year U.S. Treasury note. According to the Federal Reserve Bank of Richmond, the two have moved in tandem for more than 30 years. Lenders price mortgages as a spread on top of that Treasury yield, essentially asking: “How much more than a risk-free government bond do we need to charge to cover the extra risk of a home loan?”
In calm economic times, that spread stays relatively stable, typically hovering in a range of 1.5 to 2 percentage points above the 10-year Treasury. During periods of economic stress, the spread widens sharply. Recessions, banking crises, and sudden uncertainty all push lenders to demand a bigger cushion, which is why mortgage rates sometimes rise even when Treasury yields are falling.
One nuance worth knowing: when the yield curve inverts (meaning short-term rates are higher than long-term rates), the mortgage spread tends to blow out. The correlation between the spread and the shape of the yield curve jumps to -0.84 during those periods, according to Richmond Fed research. That happens because borrowers are expected to refinance quickly once rates drop, making mortgages behave more like short-term assets. Lenders compensate by charging more above the 10-year yield.
How the Federal Reserve Influences Rates
The Federal Reserve doesn’t set mortgage rates directly. What it controls is the federal funds rate, which is the interest rate banks charge each other for overnight loans. That rate has the strongest pull on short-term borrowing costs like credit cards, auto loans, and adjustable-rate mortgages. Fixed-rate mortgages, by contrast, track the 10-year Treasury yield rather than the federal funds rate.
Still, Fed policy has a powerful indirect effect. When the Fed raises its benchmark rate to fight inflation, it signals that borrowing costs across the economy should be higher, and Treasury yields tend to rise in response. When the Fed cuts rates to stimulate growth, the opposite happens. The Fed also buys and sells debt securities in the open market, a tool that supports the flow of credit and puts additional pressure on rates. During the pandemic, for example, massive Fed purchases of mortgage-backed securities helped push mortgage rates to historic lows.
The Role of Mortgage-Backed Securities
Most lenders don’t hold your mortgage for 30 years. Instead, they sell it on the secondary market, where agencies like Freddie Mac bundle thousands of similar loans into mortgage-backed securities (MBS) and sell them to investors: banks, insurance companies, pension funds, hedge funds, and international buyers. The cash from those sales flows back to lenders, who use it to fund new loans.
Investor appetite for these securities directly affects your rate. When demand for MBS is strong, investors accept lower returns, which translates into lower rates for borrowers. When demand weakens, perhaps because investors see better returns elsewhere or perceive more risk in housing, yields on MBS rise and mortgage rates follow. This is why global economic events, stock market swings, and even geopolitical crises can move mortgage rates: they all shift where investors want to put their money.
Your Credit Score and Down Payment
Two borrowers applying on the same day at the same lender can receive noticeably different rates. The biggest personal factors are your credit score and your loan-to-value ratio (LTV), which is the percentage of the home’s value you’re borrowing.
For conventional loans backed by Fannie Mae and Freddie Mac, lenders apply loan-level price adjustments (LLPAs), which are fees baked into your rate based on your risk profile. A borrower with a credit score of 659 borrowing 75% of the home’s value would pay a fee equal to 1.5% of the loan balance. A borrower with a score above 780 may pay no LLPA at all. That fee difference can translate to roughly a quarter to half a percentage point on your rate, or sometimes more.
Your debt-to-income ratio (DTI), which compares your monthly debt payments to your gross income, also plays a role. Higher DTI signals more financial strain, and lenders price that risk in. The property type matters too: investment properties and multi-unit homes carry higher rates than a primary single-family residence.
Loan Type and Term Length
The type of mortgage you choose has a built-in effect on your rate. Conventional loans, FHA loans (backed by the Federal Housing Administration), and VA loans (for eligible veterans and service members) each carry different risk profiles and government guarantees, which means different pricing. VA loans often come with the lowest rates because they carry a federal guarantee and no required down payment. FHA loans tend to fall between VA and conventional rates, though they require mortgage insurance that adds to your overall cost.
Loan term is another major variable. A 15-year fixed mortgage typically comes with a rate roughly 0.5 to 0.75 percentage points lower than a 30-year fixed mortgage. The reason is straightforward: a shorter loan means the lender’s money is at risk for half as long, so they charge less for that reduced exposure. Adjustable-rate mortgages (ARMs) usually start with rates below comparable fixed-rate loans because you, the borrower, are taking on the risk that rates could rise after the initial fixed period ends.
Inflation Expectations
Inflation is the invisible force behind nearly every rate movement. Mortgage investors need a return that outpaces inflation, or their money loses purchasing power over the life of the loan. When inflation is expected to stay high, investors demand higher yields on Treasury bonds and mortgage-backed securities, pushing mortgage rates up. When inflation cools, those expectations ease and rates tend to fall.
This is why monthly reports on the Consumer Price Index, employment data, and GDP growth can cause mortgage rates to jump or dip within hours. Markets are constantly recalculating where inflation is headed, and mortgage pricing updates in near-real time to reflect that consensus. A single jobs report that comes in stronger than expected can nudge rates up by a few basis points (hundredths of a percentage point) the same morning.
Discount Points and Lender Margins
Even after all the macro and personal factors are set, you still have some control over your rate through discount points. One point costs 1% of your loan amount and typically lowers your rate by about 0.25 percentage points, though the exact exchange varies by lender and market conditions. Paying points makes sense if you plan to keep the loan long enough to recoup the upfront cost through lower monthly payments.
Lender margins also vary. Two lenders looking at the same borrower profile and the same secondary market pricing can quote different rates because they operate with different overhead costs, profit targets, and competitive strategies. Shopping multiple lenders is one of the most reliable ways to get a lower rate. Research consistently shows that borrowers who get at least three quotes save meaningfully compared to those who accept the first offer.