Mortgage rates go up when it gets more expensive for lenders to fund home loans, and that cost is shaped by a handful of forces working at once: the yield on government bonds, Federal Reserve policy, inflation, investor appetite for mortgage-backed securities, and overall demand for credit. As of May 2026, the average 30-year fixed rate sits around 6.5%, with the 10-year Treasury yield near 4.5%.1Federal Reserve Bank of Boston. Why Mortgage Rates Exceed Treasury Yields Some of these forces move rates within a day. Others build slowly and show up in your monthly payment months later.
Treasury Yields Set the Baseline
The single most direct influence on 30-year mortgage rates is the yield on the 10-year U.S. Treasury note. Both are long-term lending instruments, so investors constantly compare them. Treasuries carry virtually no default risk because the federal government backs them. Mortgages carry the possibility that borrowers refinance early, default, or prepay. To compensate for that extra risk, mortgage rates always sit above Treasury yields by a margin known as the spread.2Fannie Mae. What Determines the Rate on a 30-Year Mortgage
That spread has historically averaged around 170 basis points (1.7 percentage points), though it has widened past 300 basis points during periods of severe market stress. In mid-2026, the gap is roughly 200 basis points.1Federal Reserve Bank of Boston. Why Mortgage Rates Exceed Treasury Yields When Treasury yields climb because of new government borrowing, inflation fears, or reduced foreign demand, mortgage rates follow almost immediately. Lenders have no real choice. If they don’t raise mortgage rates in step with Treasuries, investors put their money into safer government bonds instead, and the funding for new home loans dries up.
Federal Reserve Policy
The Fed influences mortgage rates through two channels. The first is the federal funds rate, the target interest rate at which banks lend to each other overnight. The Federal Open Market Committee meets eight times a year to set that target.3Federal Reserve. FOMC Meeting Calendars and Information As of mid-2026, the target range is 3.5% to 3.75%.4Federal Reserve. The Fed Explained – Accessible Version
That rate does not dictate mortgage rates directly. It governs short-term borrowing, while mortgages are long-term instruments benchmarked mainly to the 10-year Treasury.2Fannie Mae. What Determines the Rate on a 30-Year Mortgage But when the Fed raises its target, it signals that it considers the economy overheated or inflation too high, and markets adjust longer-term rates upward in anticipation of tighter conditions.
The second channel is the Fed’s balance sheet. During crises, the Fed buys large quantities of mortgage-backed securities to push rates down. That tool is called quantitative easing. The reverse, quantitative tightening, happens when the Fed lets those holdings shrink by not replacing bonds as they mature. As of April 2026, the Fed still holds roughly $2 trillion in mortgage-backed securities, down from a peak above $2.7 trillion.5Federal Reserve Bank of St. Louis. Assets: Securities Held Outright: Mortgage-Backed Securities As that pile shrinks, private investors have to absorb more of the mortgage market’s risk, and they demand higher yields to do it. This is why mortgage rates can stay elevated even after the Fed stops raising the funds rate.
Inflation Erodes Lender Returns
A lender who hands you $400,000 today won’t get the last dollar back for 30 years. If inflation runs hot during that period, those future payments buy less than the original loan was worth. Lenders protect themselves by building an inflation premium into the rate. The higher they expect inflation to be, the more they charge up front.
Two indexes guide those expectations. The Consumer Price Index tracks the average change in prices paid by urban consumers for a broad basket of goods and services.6U.S. Bureau of Labor Statistics. Consumer Price Index The Personal Consumption Expenditures price index captures inflation across a wider range of spending and reflects shifts in consumer behavior over time.7U.S. Bureau of Economic Analysis. Personal Consumption Expenditures Price Index The Fed targets 2% inflation measured by the PCE index, part of its congressionally assigned mandate of stable prices and maximum employment.8Federal Reserve. What Economic Goals Does the Federal Reserve Seek to Achieve Through Its Monetary Policy
When either index signals prices are climbing faster than expected, the whole chain reacts. Bond investors demand higher Treasury yields to compensate for lost purchasing power, and mortgage lenders tack on an even larger spread above those yields. Inflation pushes on multiple parts of the equation at once.
Mortgage-Backed Securities and Prepayment Risk
Most home loans don’t stay on the original lender’s books. They get bundled into mortgage-backed securities (MBS) and sold to investors on the secondary market. That process lets lenders keep issuing new loans: they sell the old ones, replenish their capital, and repeat. Fannie Mae and Freddie Mac guarantee most of these securities against borrower default, charging a guarantee fee that averaged around 65 basis points in 2024.9Federal Housing Finance Agency. Single-Family Guarantee Fees Report That fee gets baked into the rate you pay.
The bigger factor is prepayment risk. Mortgage borrowers can refinance or sell at any time, which means MBS investors can get their principal back earlier than expected, usually right when rates have dropped and reinvestment options are poor. Research from the Federal Reserve Bank of Boston identifies the prepayment option as the dominant driver of the gap between MBS yields and Treasury yields, accounting for roughly 80% of the variation in that spread since 2006.1Federal Reserve Bank of Boston. Why Mortgage Rates Exceed Treasury Yields When interest rate volatility rises and refinancing behavior becomes harder to predict, investors demand a wider spread, and your mortgage rate goes up even if Treasury yields haven’t moved.
Strong Economies Push Rates Higher
Good economic times create a lot of would-be borrowers at once. Employment is high, wages are rising, and consumer confidence pushes more households into the housing market. That surge in demand for mortgage financing meets a finite supply of capital, and basic supply and demand pushes the price of borrowing higher.
Lenders also respond to volume strategically. When applications are flooding in, they have less reason to compete on price, because they can fill their pipelines without cutting rates. During slowdowns, they drop rates to attract the fewer qualified borrowers still looking. This is why rates can feel counterintuitive. Your job is secure, the economy looks healthy, and yet the cost of a mortgage keeps climbing. Your improved ability to repay is part of why lenders can charge more.
Global Demand for Treasuries
The U.S. Treasury market is the world’s largest and most liquid bond market, and foreign governments and investors hold trillions of dollars in Treasury securities. When foreign demand is strong, with central banks in China, Japan, or Europe buying Treasuries to manage their own currencies, yields stay lower because more buyers are competing for the same bonds. That keeps mortgage rates lower too.
The reverse hurts. When foreign investors pull back, yields have to rise to attract other buyers. Sustained foreign buying has historically kept U.S. mortgage rates 50 to 100 basis points lower than they would otherwise be, so a meaningful pullback can add half a point to a full point to mortgage rates, all else equal. Geopolitical tensions, trade disputes, and currency shifts feed into this flow in ways that have nothing to do with the American housing market but land squarely on the American borrower.
Why Your Personal Rate Can Rise Even More
Everything above explains why the headline mortgage rate moves. The rate you personally receive can differ from that headline, because lenders and the agencies that guarantee loans charge more to borrowers they consider riskier.
Credit score is the biggest individual factor. A 100-point drop in score can add half a percentage point or more to your rate. Beyond the rate itself, Fannie Mae and Freddie Mac impose loan-level price adjustments based on a matrix of credit score and loan-to-value ratio. A borrower with a 740 score putting 20% down pays far less in pricing adjustments than someone with a 660 score putting 5% down, and the gap between those two scenarios can translate to well over a full percentage point in effective rate.
Other factors that push your individual rate higher:
- A higher debt-to-income ratio. Most conventional loans allow up to 43 to 45% DTI, but the best pricing goes to borrowers at or below 36%.
- A smaller down payment. Less equity means more risk for the lender, which means a higher rate and usually private mortgage insurance on top.
- Loan type. Jumbo loans, investment property loans, and cash-out refinances all carry pricing surcharges compared with a standard owner-occupied purchase.
- Skipping discount points. Borrowers who choose lender credits instead of paying points accept a higher rate in exchange for lower closing costs.
What a Rate Increase Actually Costs
Percentages in the abstract don’t land the same way as dollars out of your pocket. On a $400,000 loan over 30 years, the difference between a 6% rate and a 7% rate is roughly $260 per month, and about $94,000 in total interest over the life of the loan. That single percentage point doesn’t just change your monthly budget. It changes how much house you can afford in the first place, because lenders size your maximum loan based on the payment you can carry at the current rate.