How interest rates change what you can afford

Why a one-point change in the mortgage rate moves the price you can afford by roughly 10%, with the numbers worked out.

The short version

Your monthly budget buys a mortgage, not a price. When rates rise, more of each payment goes to interest, so the same payment supports a smaller loan, so you can afford a lower price. As a rule of thumb, every 1 percentage point change in the rate moves your buying power by roughly 10%. The home did not change. The rate did.

The same budget at different rates:

Rate	Monthly payment on $400,000	Buying power on $2,500 a month
5%	about $2,147	about $466,000
6%	about $2,398	about $417,000
7%	about $2,661	about $376,000

As of mid-2026, the average 30-year fixed rate sits around 6.5%, and that number is the single biggest input into how much house your budget reaches.

Why the payment, not the price, is the real constraint

Most buyers shop by monthly payment, because that is what has to fit the budget every month. A mortgage payment is mostly principal and interest, and the interest portion is set by the rate. Raise the rate and the payment on a given loan goes up. To keep the payment the same, you have to borrow less. (For how lenders cap that payment using the 28/36 guideline, see how much house you can afford.)

The math, worked out

Take a buyer who can comfortably budget $2,500 a month for principal and interest. On a 30-year loan, here is what that payment buys at different rates:

At 5%: about $466,000 in loan.
At 6%: about $417,000.
At 7%: about $376,000.

Moving from 5% to 7%, two points, cuts buying power from about $466,000 to about $376,000. That is roughly 19% less home for the identical monthly payment. Each single point is worth about $45,000, close to 10% of buying power, on this budget. The buyer's income, savings, and target neighborhood never changed. Only the rate did.

The same effect, from the payment side

Now hold the price fixed and watch the payment move instead. On a $400,000 loan over 30 years, principal and interest run about:

$2,147 a month at 5%
$2,398 a month at 6%
$2,661 a month at 7%

That is roughly a $500 monthly swing across two points, about $6,000 a year, on the exact same house. Whether you look at it as less house for the same payment or a bigger payment for the same house, the rate is doing the work.

Why this matters even when prices are flat

A buyer can be priced out by rates without home prices rising at all. When rates climbed from the 3% era into the 6% to 7% range, the payment on the same house nearly doubled. That is the affordability squeeze of the last few years, and it happened even where prices barely moved. It also runs in reverse: if rates fall, your buying power rises, which is part of why a rate drop can heat a market up quickly.

The low-rate asset

Because the rate drives affordability so heavily, an existing low rate is a financial asset. A seller carrying an assumable loan at 3% holds something a buyer cannot get on the open market, and in the right situation a buyer can take over that loan and the dramatically lower payment that comes with it. (See the assumable mortgage listing for how a 3% rate gets priced as a buyer asset.)

What to do with this

Four moves follow from the math. First, get pre-approved, so you know your real payment and price ceiling at today's rate instead of guessing. Second, shop lenders, because rates and fees vary and comparing a few can save real money. Third, understand the trade-offs of buying down the rate with points, choosing an adjustable rate, or making a larger down payment, each of which changes the payment math. Fourth, remember the rate is not permanent: if rates fall later, refinancing can reset your payment, so do not let today's rate alone talk you out of a home that otherwise fits.

Frequently asked questions

How much do interest rates affect how much house I can afford?

A lot. As a rule of thumb, every 1 percentage point change in the mortgage rate moves your buying power by roughly 10%. On a $2,500 monthly principal-and-interest budget, a 30-year loan supports about $466,000 at 5%, about $417,000 at 6%, and about $376,000 at 7%, the same payment buying noticeably less as the rate rises.

Why does a higher rate mean a smaller loan?

Because more of each payment goes to interest. Your monthly budget supports a fixed payment, and a mortgage payment is mostly principal and interest. When the rate rises, the interest portion grows, so to keep the payment the same you have to borrow less, which means you can afford a lower price.

Can I be priced out by rates even if home prices do not rise?

Yes. Rates alone can push a payment out of reach. When rates rose from around 3% to the 6% to 7% range, the principal-and-interest payment on the same home nearly doubled, even where prices held steady. That is why affordability tightened sharply in recent years despite flat or slow price growth in some areas.

What is the mortgage rate right now?

As of mid-2026, the average 30-year fixed rate is around 6.5%, and most forecasts expect rates to stay above 6% through the year. Rates change constantly, so confirm the current number and your own quoted rate with a lender before relying on it.

If rates are high, should I wait to buy?

It depends on your situation, not the headline rate. Rates are not permanent, and refinancing can reset your payment if they fall later. Get pre-approved to see what you can afford today, compare lenders, and weigh options like buying down the rate or a larger down payment. The right answer is about your budget and plans, not timing the market.

Sources: Freddie Mac Primary Mortgage Market Survey for the current 30-year fixed rate (around 6.5% as of late June 2026) and rate context, with the payment and buying-power figures calculated from standard 30-year amortization at the rates shown. Rates change frequently; confirm current numbers with a lender.

This article is general information, not financial or lending advice. Confirm the specifics of your situation with a qualified professional before acting.