What Is a Mortgage Rate?

What Is a Mortgage Rate?

Let me tell you straight: a mortgage rate is simply the interest charged on a home loan, expressed as an annual percentage.

These rates shift with the broader economic conditions at any time, but the specific rate you get as a homebuyer comes from the lender and hinges on your credit history, financial situation, and other factors.

You have options between variable-rate or fixed-rate mortgages. With a variable rate, it rises or falls along with national borrowing costs, which means your monthly payment can change for better or worse. A fixed rate stays constant throughout the mortgage term.

Understanding Mortgage Rates

When you're looking to buy a home with a loan, the prevailing mortgage rate is a key factor you need to consider. The rate you secure directly affects your monthly payment amount.

Mortgage rates respond sharply to economic shifts. Since 1980, the average for a 30-year fixed-rate mortgage peaked at 18.63% during high inflation in 1981 and bottomed at 2.67% in 2020 amid the COVID-19 pandemic. As of late May 2025, the national average stood at 6.89%.

To see why the rate matters, consider a $400,000 house where you put down $80,000 or 20%. You're financing $320,000. Using a mortgage calculator, your monthly payment—excluding taxes or insurance—on a 30-year term would be:

$1,293 at the historic low of 2.67%, $2,105 at the mid-2025 average of 6.89%, and $4,987 at the historic high of 18.63%.

Keep an Eye on the Fed

The Federal Reserve's decisions on rates it charges banks are the biggest influence on mortgage rates and all U.S. borrowing rates, aimed at system stability. These rates, set every six weeks, form the basis for all other loan rates.

Mortgage Rate Indicators to Keep an Eye On

Since interest rates impact your monthly costs so much, if you're thinking about buying a home, you should track their direction.

One indicator is the prime rate, which is the lowest average rate banks offer for credit, used for interbank lending and to top borrowers. It typically follows the Federal Reserve’s federal funds rate, sitting about 3% higher. The lowest mortgage rates on average hit in 2020 and 2021 due to the pandemic.

Another is the 10-year Treasury bond yield, which signals market trends in interest rates. If it rises, mortgage rates usually follow, and the same in reverse if it drops.

Even though most mortgages are for 30 years, many get paid off or refinanced within 10 years, making the 10-year yield a solid gauge. You can also check weekly updates on mortgage rate trends from Freddie Mac's site.

Determining a Mortgage Rate

Lenders take on risk when issuing a mortgage, as there's always a chance of default.

Several factors determine your rate, and higher risk means a higher rate to help the lender recover the loan faster if needed, safeguarding their investment.

Your credit score is crucial—it assesses the rate and loan size you can get. A high score shows good financial history and reliability in repaying debts, allowing the lender to offer a lower rate due to reduced default risk.

Is a Fixed-Rate Mortgage or a Variable Rate Mortgage Better?

A fixed-rate mortgage provides security: your payment stays the same regardless of external interest rate changes. If rates drop, you can refinance.

A variable-rate mortgage often starts with a slightly lower rate, helping keep costs down initially when money might be tight. The bank assumes rates will rise, while you hope they fall.

If rates rise instead, your payment increases, and refinancing isn't an option until they drop again.

How Are Mortgage Payments Calculated?

Your monthly interest is 1/12th of your annual rate times the remaining principal. For example, on $320,000 at 6.00%, the first month's interest is $1,600 ($320,000 * 0.005). The rest of your payment goes to principal. Each month, more goes to principal and less to interest. The full 360 payments for a 30-year mortgage make up your amortization schedule.

What Is Private Mortgage Insurance?

If your down payment is under 20% of the purchase price, you might need private mortgage insurance (PMI) to protect the lender in case of default. You can remove it once your home equity exceeds 20%. Until then, it costs $30 to $70 monthly per $100,000 borrowed.

The Bottom Line

In essence, a mortgage rate is the interest you pay to finance a home purchase.

You'll secure the best rate with a strong credit rating and proof you can repay the loan.

That said, the available rates at any time are beyond your control, set by prevailing interest rates that shift weekly with economic conditions.