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Homebuyers face severe uncertainty this fall amid surging mortgage rates and stubbornly high living costs, but those who prepare and take stock of their finances early can shield their budgets from unexpected spikes.
Last week, the average rate on 30-year fixed home loans surged to an 18-month high of 6.95%, propelled by climbing 10-year Treasury yields as the Federal Reserve increased its interest rates for the first time in three years.
These developments have made home shoppers question whether they can manage monthly payments on their purchase, as reflected in a slowdown in August’s existing-home sales.
To offer jittery buyers guidance on navigating market uncertainty, Realtor.com® researchers analyzed monthly mortgage rate shifts dating to 2000, establishing clear benchmarks for how much rates typically fluctuate over time—and how risk-averse buyers can adjust their budgets accordingly.
“Rate-proofing for potential buyers right now is super important because they can’t build assumptions for their finances on the chance that interest rates may go down,” Ralph DiBugnara, president of Home Qualified, tells Realtor.com.
“They need to be comfortable with the monthly payment, whether the rates go down or up, and build their budgets around that. This is not a market where you can time for the best rate and the best price that’s the best fit for you.”
The 12-month strategy for mortgage rates
If their purchase window extends over the next 12 months, buyers are advised to be ready for a mortgage rate to move as much as 100 basis points in either direction of today’s rate, a range that covers 80% of historical scenarios considered in the analysis.
For example, if the current 30-year fixed mortgage rate is roughly 7%, a home shopper should be equally prepared for the rate to drop to 6% or surge to 8% by next September.
As Realtor.com senior economist Joel Berner explains, this mathematical exercise carries major real-world consequences.
For a buyer with a monthly budget of $2,000 for mortgage payments, the difference between a 6% and an 8% mortgage rate determines whether they can take on a loan balance of $333,583 at the low end or $272,567 at the high end.
“The potential variability in rates one year out can create a range of over $60,000 in homebuying power for this hypothetical buyer,” says Berner.
Tania Jhayem, a real estate agent at Keller Williams The Marketplace‘s luxury division in Las Vegas, says that in the current environment, where buyers’ affordability is already stretched thin, “rate-proofing” for the future is the smart approach.
“Buyers shouldn’t build a home search around the assumption that the rate they see today will still be available three, six, or 12 months from now,” she tells Realtor.com. “Rather than asking, ‘What can I afford at today’s rate?’ I would encourage buyers to ask, ‘What can I still comfortably afford if rates are higher when I actually purchase?'”
Six-month strategy
An aspiring homeowner starting to plan six months in advance should budget for mortgage rates to move up to 75 basis points up or down.
For the buyer operating on a $2,000 monthly budget, a rate jump to 7.75% lowers their loan capacity to $279,169.
On the other hand, if mortgage rates retreat to 6.25%, that purchasing power expands to $324,824—a buying power boost of more than $45,000.
“The further out buyers feel they are from actually closing on a home, whether it be 60, 90, 120, or 180 days, the bigger the payment buffer they are using as a variable should be,” says DiBugnara. “I would always want a buyer to be very conservative on the low side and use the high side of interest rate and monthly payments to make decisions on homes they want to purchase.”
According to Jhayem, building a rate buffer into a budget helps buyers identify a price point they can actually afford.
“If someone is six months away and planning around a 75-basis-point swing, we can establish their comfortable monthly payment first and then determine the price range that still works under that higher rate scenario,” says the agent. “The goal isn’t necessarily to qualify for the maximum amount. It’s to make sure the purchase still feels financially comfortable if the market moves against you.”
Three-month strategy
Shoppers who have a narrower timeline of three months to make a move have a better sense of where the rates will land when they go to obtain a loan. Historically, 80% of the time, rates fluctuate 40 to 45 basis points in either direction over the course of three months.
To be on a more conservative side with an extra cushion, Realtor.com experts suggest that buyers allow for 50 basis points of movement from the current rate.
In other words, a buyer looking to secure a home just before Christmas this year should budget for the 30-year fixed mortgage rate to edge down to as low at 6.5% or rise to as high as 7.5%.
For the hypothetical $2,000-per-month buyer, this range of rates translates into loan balances of $316,422 and $286,035, respectively.
“This roughly $30,000 difference is still sizable, a sign of how much buyers need to be flexible,” notes Berner.
How rate shifts hit your monthly payment
Consider a home purchaser three months away from closing on the median-priced property of $424,500, assuming a 10% down payment. If the rates stay at around 7%, the buyer’s monthly principal and interest payment would amount to $2,542.
If the rate edges down to 6.5%, that monthly payment would shrink to $2,415. However, should the rate rise to 7.5%, where it was in November 2023, the payment will increase to $2,671.
To rate-proof their homebuying budget, the shopper should be prepared to pay $129 more or $127 less per month, depending on how the rates move.
Mortgage volatility is a constant feature of the homebuying process, no matter the state of the economy. What a buyer can afford continuously shifts: a dream home that was within budget just a week ago can suddenly become out of reach today depending on rate ups and downs.
But experts maintain that following these guidelines makes these shifts more predictable, allowing shoppers to be better prepared and more empowered to take control of their homebuying.
Tips for buyers
“Currently, homebuyers need to be very cautious on how much they gamble on interest rates for the homes they’re interested in,” says DiBugnara. “They move much faster up than they will down. Interest rates coming down any significant amount will take a long period of time, and it is very tied to how fast inflation can come down.”
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Both DiBugnara and Jhayem agree that trying to time mortgage rates is next to impossible.
“Instead, buyers should know their payment at several different rate scenarios before they write an offer,” suggests the Vegas agent. “They should also understand what options may be available if rates move higher, including permanent rate buydowns, seller concessions where appropriate, adjusting the down payment, or simply changing the purchase price.”
Meanwhile, the Home Qualified president urges shoppers to “control their own controllables,” meaning to prepare for a home purchase by reducing their other monthly debt obligations and boosting savings.
Jhayem describes this process as creating “financial breathing room” by paying down revolving debt to improve debt-to-income ratios to give the buyer more flexibility if mortgage rates swing up.
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