How Mortgage Rates Work

Are you comparing mortgage rates from different lenders and wondering why the numbers don't match?

The 30-year fixed-rate mortgage averaged 6.01 percent as of mid-February 2026, according to Freddie Mac, but the rate you're offered could be a full percentage point higher or lower depending on your financial profile and which lender you ask.

Understanding how mortgage rates are determined gives you a real advantage when you're ready to buy or refinance a home in Worcester County.

What drives mortgage rates up and down

Mortgage rates aren't set by any single person or institution. They're the product of several economic forces working together, most of them operating well above the level of your individual loan application.

The starting point is the yield on the 10-year U.S. Treasury bond, the interest rate the federal government pays investors who lend it money for a decade. When the 10-year Treasury yield rises, mortgage rates tend to follow.

When it falls, mortgage rates usually come down too. Lenders track the 10-year bond rather than the 30-year because most mortgages are paid off or refinanced within seven to 10 years, making the 10-year Treasury the closest match in duration, according to Fannie Mae.

Your mortgage rate will always be higher than the Treasury yield by an amount called the spread. Since the end of the Great Recession, that spread has averaged about 1.7 percentage points, according to Fannie Mae.

So if the 10-year Treasury yield is 4.3 percent, you'd expect a 30-year fixed mortgage rate somewhere around 6 percent. The spread doesn't stay constant, though. During 2023 and 2024, it widened to around 3 percentage points, according to Bankrate, pushing mortgage rates higher than the Treasury yield alone would have suggested.

How the Federal Reserve fits in

The Fed sets the federal funds rate and the rate banks charge each other for overnight loans.

That rate has a strong influence on short-term borrowing costs like credit cards and home equity lines of credit, but fixed-rate mortgages follow the bond market more closely.

Where the Fed does affect mortgage rates is through inflation expectations. When the Fed raises its rate to slow inflation, bond investors adjust their outlook for future economic growth. If investors believe inflation will stay under control, they accept lower yields on Treasury bonds, which tends to pull mortgage rates down.

If they expect inflation to persist, yields rise, and mortgage rates go with them.

The Fed also pushed mortgage rates to historic lows during the pandemic by buying large quantities of mortgage-backed securities (MBS) — bundles of home loans packaged as investments.

The 30-year fixed rate bottomed at 2.65 percent in January 2021, per Freddie Mac. The Fed ended that purchasing program in December 2025, and private investors now absorb the full supply of MBS, which is one reason the spread between Treasury yields and mortgage rates remains wider than its long-term average.

The factors you can control

While you can't move the bond market, several parts of your mortgage rate are directly within your control. These personal factors can mean the difference between the average rate you see in the news and the rate on your loan estimate.

Build and protect your credit score

Your credit score is one of the two biggest factors in your individual rate, according to the Consumer Financial Protection Bureau.

A score of 740 or above typically qualifies you for the lowest available rates, per NerdWallet. On a $300,000 loan, the gap between a top-tier credit score and a score in the 620 to 639 range can add up to more than $60,000 in interest over 30 years, according to data compiled by Curinos for myFICO.com.

If your score has room to improve, paying down credit card balances and correcting errors on your credit report before you apply could save you a meaningful amount.

Make a larger down payment

Your down payment determines your loan-to-value (LTV) ratio (the percentage of the home's value that you're borrowing).

If you're buying a $400,000 home and putting $80,000 down, your LTV is 80 percent. An LTV at or below 80 percent generally earns you a better rate and lets you avoid private mortgage insurance (PMI).

You don't need 20 percent down, conventional loans allow as little as 3 percent, and FHA loans go as low as 3.5 percent, but a lower LTV usually means a lower rate.

Keep your debt-to-income ratio low

Your debt-to-income (DTI) ratio is your total monthly debt payments divided by your gross monthly income.

If you earn $6,000 a month and your debts add up to $2,400, your DTI is 40 percent. Most lenders prefer a DTI of 36 percent or below, though you may be approved with a ratio as high as 43 percent. A lower DTI signals more breathing room in your budget and can help you qualify for a better rate.

Choose the right loan type and term

A 15-year fixed mortgage will almost always have a lower rate than a 30-year — the 15-year averaged 5.35 percent in mid-February 2026 compared to 6.01 percent for the 30-year, according to Freddie Mac.

You'll pay more each month with the shorter term, but you'll save substantially on total interest.

Government-backed loans work differently. FHA loans may accept credit scores as low as 580 with 3.5 percent down, though they come with mortgage insurance premiums.

VA loans, available to eligible veterans, often carry some of the lowest rates on the market. Adjustable-rate mortgages offer a lower initial rate, but that rate can change after the introductory period; usually five or seven years. If you're planning to stay long-term, the predictability of a fixed rate is usually worth the slightly higher starting cost.

Ask about discount points

Discount points let you pay an upfront fee to reduce your interest rate. Each point costs about 1 percent of your loan amount and typically lowers your rate by a fraction of a percentage point.

On a $350,000 loan, one point would cost $3,500. Whether points make sense depends on how long you plan to keep the loan. If you're staying in the home for seven or more years, the monthly savings often outweigh the upfront cost. If you expect to move or refinance sooner, you may be better off keeping that cash available.

Why shopping around matters more than you think

One of the most effective things you can do to get a lower rate is simply getting quotes from more than one lender. Freddie Mac research found that borrowers who received quotes from two different lenders reduced their rate by an average of 10 basis points during normal markets and 20 basis points when rates were elevated. Borrowers who gathered at least four quotes saved more than $1,200 per year during high-rate periods.

Genaro Villa, a macro and housing economics researcher at Freddie Mac, has noted that rate dispersion — the range of rates offered to similar borrowers on the same day — widens when rates are higher. Two lenders might quote you rates that differ by half a percentage point or more, even though your application looks identical.

In Worcester County, you'll find national lenders, regional banks, credit unions, and mortgage brokers.

Each sets its own rates based on its business model and overhead costs. Getting at least three to four quotes and comparing the annual percentage rate (APR), which includes fees and points, gives you a clearer picture of the true cost of each offer.

Lock in when you're ready

Mortgage rates change daily. Once you've found a rate you're comfortable with, you can ask your lender for a rate lock, which guarantees that rate for a set period — usually 30 to 60 days — while your loan is processed.

If rates rise during that window, you're protected. Some lenders offer float-down options that let you capture a lower rate if one becomes available before closing.

Mortgage rates are shaped by forces that range from global bond markets down to the three digits of your credit score.

You can't control the first part, but every step you take on the second — strengthening your credit, managing your debt, saving for a larger down payment, and comparing lenders — moves the number in your favor.