How Does a 1% Interest Rate Change Affect Your Buying Power?

When you're deciding whether a home fits your budget, it's easy to fixate on the price tag. But mortgage rates are an equally important part of the affordability equation — and they probably changed since you last did the math. 

Mortgage interest rates change frequently, and even seemingly small changes in rates can affect not only what you’ll pay for housing each month and over the long run, but how much you can afford to spend on a home.

Given the extraordinary volatility of the mortgage market in recent years, it helps to know how interest rates impact what you can afford — and how you can keep on top of rates so you’re getting the best possible deal.

How does the mortgage rate affect your monthly payment?

When you pay your mortgage every month, you’re paying down the amount you borrowed — known as the principal, and the interest on that money. The payments follow a fixed schedule, with the earlier payments consisting mostly of interest. Over time, a greater share of the payment goes toward the principal until you refinance, sell your home, or pay it off.

“Even a small move in mortgage rates can change what you pay each month by more than many people expect — and that difference compounds over the life of the loan," says Zillow Chief Economist Mischa Fisher. "It moves your purchasing power, too. Even a quarter of a percentage point can change how many homes you're actually in a position to act on.”

How much of a difference does 1% make on a mortgage rate?

To show how rate changes affect your monthly payment and buying power, we ran the numbers on a typical home — both nationally and in select metros. We assumed a 20% down payment and the most common loan: a fixed-rate, 30-year mortgage.

Notes: Figures are based on May 2026 data and don't include taxes or insurance. Buying power assumes your down payment amount stays the same. At a lower rate, that fixed payment covers a larger loan — so you can afford a higher-priced home.*

For a typical U.S. home, valued at $368,700: $194 a month

At a 7% mortgage rate:

• Your monthly payment would be $1,962.
• At 6%, it’s $1,768, or $194 less each month.
• Over 30 years, the difference would save you $69,819 in interest.

Buying power boost: If you budgeted about $1,962 a month for a mortgage payment, and the interest rate dropped 1 percentage point — from 7% to 6% — you could spend about $32,348 more on a home without increasing your monthly payment.

For a typical home in San Diego, valued at $943,100: $497 a month

At a 7% mortgage rate, your monthly payment would be $5,020. At 6%, it's $4,523, or $497 less each month. Over 30 years, the difference would save you $178,591 in interest. 

Buying power boost: If you budgeted $5,020 a month for a mortgage payment, and the interest rate dropped 1 percentage point — from 7% to 6% — you could spend about $82,743 more on a home without increasing your monthly payment.

For a typical home in Atlanta, valued at $381,100: $200 a month

At a 7% mortgage rate, your monthly payment would be $2,028. At 6%, it's $1,828, or $200 less each month. Over 30 years, the difference would save you $72,167 in interest. 

Buying power boost: If you budgeted $2,028 a month for a mortgage payment, and the interest rate dropped 1 percentage point — from 7% to 6% — you could spend $33,436 more on a home without increasing your monthly payment.

See what you can buy at today's rate

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For a typical home in Dallas, valued at $364,200: $191 a month

At a 7% mortgage rate, your monthly payment would be $1,938. At 6%, it's $1,747, or $191 less each month. Over 30 years, the difference would save you $68,967 in interest. 

Buying power boost: If you budgeted $1,938 a month for a mortgage payment, and the interest rate dropped 1 percentage point — from 7% to 6% — you could spend $31,953 more on a home without increasing your monthly payment.

For a typical home in St. Louis, valued at $275,900: $145 a month

At a 7% mortgage rate, your monthly payment would be $1,468. At 6%, it's $1,323, or $145 less each month. Over 30 years, the difference would save you $52,246 in interest. 

Buying power boost: If you budgeted $1,468 a month for a mortgage payment, and the interest rate dropped 1 percentage point — from 7% to 6% — you could spend $24,206 more on a home without increasing your monthly payment.

For a typical home in Pittsburgh, valued at $231,400: $122 a month

At a 7% mortgage rate, your monthly payment would be $1,232. At 6%, it's $1,110, or $122 less each month. Over 30 years, the difference would save you $43,819 in interest.

Buying power boost: If you budgeted $1,232 a month for a mortgage payment, and the interest rate dropped 1 percentage point — from 7% to 6% — you could spend $20,302 more on a home without increasing your monthly payment.

How much of a difference does 0.5% make on a mortgage rate?

For a typical U.S. home, valued at $367,500: $98 a month

• Your monthly payment would be $1,962.
• At 6.5%, it's $1,858, or $98 less each month.
• Over 30 years, the difference would save you $35,175 in interest.

Buying power boost: If you budgeted $1,956 a month for a mortgage payment, and the interest rate dropped half a percentage point — from 7% to 6.5% — you could spend $19,323 more on a home without increasing your monthly payment.

For a typical home in Phoenix, valued at $448,400: $120 a month

At a 7% mortgage rate, your monthly payment would be $2,387. At 6.5%, it's $2,267, or $120 less each month. Over 30 years, the difference would save you $42,919 in interest. 

Buying power boost: If you budgeted $2,387 a month for a mortgage payment, and the interest rate dropped half a percentage point — from 7% to 6.5% — you could spend $18,862 more on a home without increasing your monthly payment.

For a typical home in Portland, Oregon, valued at $552,000: $147 a month

At a 7% mortgage rate, your monthly payment would be $2,938. At 6.5%, it's $2,791, or $147 less each month. Over 30 years, the difference would save you $52,835 in interest.

Buying power boost: If you budgeted $2,938 a month for a mortgage payment, and the interest rate dropped half a percentage point — from 7% to 6.5% — you could spend $23,220 more on a home without increasing your monthly payment.

For a typical home in Cincinnati, valued at $311,300: $83 a month

At a 7% mortgage rate, your monthly payment would be $1,657. At 6.5%, it's $1,574, or $83 less each month. Over 30 years, the difference would save you $29,796 in interest. 

Buying power boost: If you budgeted $1,657 a month for a mortgage payment, and the interest rate dropped half a percentage point — from 7% to 6.5% — you could spend $13,095 more on a home without increasing your monthly payment.

For a typical home in Las Vegas, valued at $430,600: $115 a month

At a 7% mortgage rate, your monthly payment would be $2,292. At 6.5%, it's $2,177, or $115 less each month. Over 30 years, the difference would save you $41,215 in interest.

Buying power boost: If you budgeted $2,292 a month for a mortgage payment, and the interest rate dropped half a percentage point — from 7% to 6.5% — you could spend $18,113 more on a home without increasing your monthly payment.

How much of a difference does .25% make on a mortgage rate?

For a typical U.S. home, valued at $367,500: $49 a month

At a 7% mortgage rate:

• Your monthly payment would be $1,962.
• At 6.75%, it's $1,907, or $49 less each month.
• Over 30 years, the difference would save you $17,680 in interest.

Buying power boost: If you budgeted $1,956 a month for a mortgage payment, and the interest rate dropped a quarter of a percentage point — from 7% to 6.75% — you could spend $9,465 more on a home without increasing your monthly payment.

For a typical home in Seattle, valued at $742,900: $99 a month

At a 7% mortgage rate, your monthly payment would be $3,954. At 6.75%, it's $3,855, or $99 less each month. Over 30 years, the difference would save you $35,740 in interest.

Buying power boost: If you budgeted $3,954 a month for a mortgage payment, and the interest rate dropped a quarter of a percentage point — from 7% to 6.75% — you could spend $15,306 more on a home without increasing your monthly payment.

For a typical home in Denver, valued at $569,300: $76 a month

At a 7% mortgage rate, your monthly payment would be $3,030. At 6.75%, it's $2,954, or $76 less each month. Over 30 years, the difference would save you $27,388 in interest.

Buying power boost: If you budgeted $3,030 a month for a mortgage payment, and the interest rate dropped a quarter of a percentage point — from 7% to 6.75% — you could spend $11,730 more on a home without increasing your monthly payment.

For a typical home in Miami, valued at $475,600: $63 a month

At a 7% mortgage rate, your monthly payment would be $2,531. At 6.75%, it's $2,468, or $63 less each month. Over 30 years, the difference would save you $22,880 in interest.

Buying power boost: If you budgeted $2,531 a month for a mortgage payment, and the interest rate dropped a quarter of a percentage point — from 7% to 6.75% — you could spend $9,799 more on a home without increasing your monthly payment.

For a typical home in Charlotte, valued at $390,300: $52 a month

At a 7% mortgage rate, your monthly payment would be $2,077. At 6.75%, it's $2,025, or $52 less each month. Over 30 years, the difference would save you $18,777 in interest.

Buying power boost: If you budgeted $2,077 a month for a mortgage payment, and the interest rate dropped a quarter of a percentage point — from 7% to 6.75% — you could spend $8,042 more on a home without increasing your monthly payment.

Should you wait for mortgage rates to drop to buy a house?

No one knows what’s going to happen to interest rates. Nothing guarantees that they’ll come down or how much they’ll drop if they do. Rate dips can also help drive an increase in home prices, as more buyers enter the pool and compete for homes. 

“If buyers want to try to time their purchase with a low mortgage rate window, they should start to build relationships with a couple of lenders early on,’’ Fisher says. “But don’t discount your opportunity to refinance later on if you find the right home now.”

*This article is for educational purposes only. The figures and examples shown are illustrative and based on assumptions that may not reflect your situation. This is not financial advice. Talk to a lender to understand your actual buying power and loan options.