A home sold when mortgage rates were near 4% is still being used to support prices in a market where buyers are borrowing near 7%. That does not make the sale useless. It does mean we should stop pretending the financing environment is irrelevant.

A $300,000 mortgage at 4% costs about $1,432 per month in principal and interest.

At 6.76%, that same $300,000 costs about $1,948 per month.

Nothing about the house changed.

The buyer’s cost did.

By more than $500 every month.

And yet in real estate, we routinely look backward at closed sales to determine what a property should be worth today.

That is normally reasonable. Comparable sales are the foundation of residential valuation.

But there is an elephant in the room.

Some of the sales still influencing pricing today were created in a financing environment that no longer exists.

When money was cheap, buyers could stretch further. Another $10,000 on the purchase price did not move the payment nearly as much. More households qualified. More buyers could tolerate repairs, competition, or the risk of paying aggressively for the right property.

Near 7%, the calculation changes.

The same income supports less debt. The same house consumes more of the monthly budget. A buyer who might have stretched before may now walk away entirely.

That does not mean every house should suddenly be worth 20% less.

It does mean that a sale produced by a 4% mortgage market cannot automatically be treated as perfect evidence of what buyers will support in a 7% mortgage market.

A comparable sale tells us what someone paid.

It does not, by itself, tell us whether the market that produced that price still exists.

Start with the payment

Ignore taxes, insurance and HOA fees for a moment.

Take exactly $300,000 of mortgage debt on a 30-year fixed loan.

At 4%, principal and interest are approximately:

$1,432 per month.

At the current 6.76% average:

$1,948 per month.

Same house.

Same loan amount.

Same 30 years.

Approximately $516 more every month.

That is more than $6,100 per year in additional debt service.

At 7%, the payment is almost $1,996.

Now reverse the calculation.

Suppose the buyer who could afford a $300,000 mortgage at 4% still wants to spend approximately $1,432 per month on principal and interest.

At 6.76%, that payment supports a mortgage of only about:

$220,600.

At 7%, it supports approximately:

$215,300.

That does not mean a $300,000 house should automatically fall to $220,000.

Housing markets do not work that neatly.

But it does demonstrate something important:

The same household income does not create the same purchasing power when the cost of borrowing changes.

The Federal Reserve has explicitly documented the effect. Its research found that the rise in mortgage rates dramatically increased payments on newly originated mortgages, reduced housing demand and contributed to a steep decline in home sales.

That matters when we talk about value.

A house does not trade in a vacuum

There is a common argument that mortgage rates should not affect the underlying value of a house.

After all, the structure did not change because Treasury yields moved.

The lot did not become smaller.

The kitchen did not lose cabinets.

The roof did not suddenly age ten years.

A cash buyer could theoretically purchase the exact same property without caring about mortgage rates at all.

All true.

But market value is not an engineering measurement of the physical property.

It is a measurement of what buyers and sellers are likely to agree upon in a competitive market at a particular point in time.

Fannie Mae's own definition describes market value as the most probable price a property should bring in a competitive and open market, with informed and typically motivated buyers and sellers, as of a specified date.

That date matters.

The buyer pool matters.

Available credit matters.

Income matters.

Inventory matters.

The monthly cost of owning the asset matters.

Mortgage rates influence several of those things simultaneously.

The Federal Reserve puts the basic mechanism plainly: lower interest rates generally encourage borrowing, including mortgages, while higher rates restrain borrowing.

So while the mortgage itself may not be part of the physical property, the mortgage market absolutely influences the market for the property.

Think about the buyer, not just the house

Consider two buyers looking at the same home.

One bought in 2021.

The other is buying today.

The first buyer may have been offered a mortgage near 3%.

Their payment was low enough that they could stretch another $20,000 or $30,000 without radically changing the monthly budget.

They might overlook an aging HVAC system.

They might waive repairs.

They might bid above asking because another $10,000 financed over 30 years barely moved the monthly payment.

They might buy sooner because borrowing money was extraordinarily cheap.

Now put a buyer into essentially the same transaction around 7%.

The economics change.

Every additional dollar of purchase price carries substantially more debt service.

The buyer may have less monthly margin after the mortgage.

The inspection matters more.

Insurance matters more.

Taxes matter more.

Future repairs matter more.

The price matters more.

Calling that buyer simply “more risk averse” probably understates what is happening.

The buyer's financial exposure has changed.

And buyers who cannot make the numbers work do not merely offer less.

Some disappear from the buyer pool entirely.

The Federal Reserve has found that the increase in mortgage costs disproportionately reduced purchases by lower-income households partly because debt-to-income constraints limit how much borrowers can finance.

That is demand destruction.

And demand is one of the things that determines price.

So why didn't home prices collapse?

This is where the story becomes more complicated.

If rates went from roughly 3% to nearly 7%, and purchasing power dropped dramatically, it seems reasonable to ask why home values did not simply fall until the monthly payment returned to where it started.

The answer is that high mortgage rates attacked both sides of the housing market.

They hurt buyers.

But they also trapped sellers.

Millions of homeowners refinanced or purchased homes during the low-rate period.

The Federal Reserve reported this summer that the majority of outstanding mortgages still carry rates below 4%, while market rates remain substantially higher.

Selling a house with a 3% mortgage and buying another at nearly 7% can mean taking on a dramatically larger payment even when the homeowner does not substantially upgrade.

So people stayed put.

Researchers call this the mortgage rate lock-in effect.

FHFA researchers estimated that for every percentage point by which prevailing mortgage rates exceeded a homeowner's existing rate, the probability of that homeowner selling fell by 18.1%. Their research estimated that mortgage lock-in prevented approximately 1.33 million sales between the second quarter of 2022 and the fourth quarter of 2023.

That removed enormous amounts of inventory.

And here is where housing economics starts behaving in a way that frustrates almost everyone.

The same interest-rate increase that reduces what buyers can afford can also reduce the number of houses available for those buyers to purchase.

FHFA researchers estimated that elevated mortgage rates directly pushed prices down, but the shortage of homes created by mortgage lock-in pushed prices upward even more during the period they studied. Their estimate attributed a 3.3% downward price effect to elevated rates, while the inventory restriction associated with lock-in increased prices by 5.7%.

Federal Reserve researchers reached a similar conclusion from another direction. They estimated that mortgage lock-in explained 44% of the decline in mortgage-borrower mobility from 2021 to 2022 and, under the unusually tight market conditions of that period, contributed to higher prices. Importantly, their model found that the same lock-in shock in a more balanced market similar to 2019 would have produced little or no price effect.

That distinction is critical.

High rates do not mechanically produce lower prices.

They change the market.

What happens next depends heavily on supply.

And that creates a problem for comparable sales

A comparable sale is often treated as though it contains some fundamental truth about a property's value.

It does not.

A comp tells us what one buyer and one seller agreed upon under the market conditions that existed when that property went under contract.

That is evidence.

Very useful evidence.

But evidence still has context.

Was inventory extremely low?

Were buyers competing aggressively?

Were mortgage rates 3%?

Were rates 7%?

Were builders buying down rates?

Were sellers paying closing costs?

Were insurance premiums materially different?

Was the market appreciating?

Was it declining?

Was the buyer pool expanding or contracting?

Those questions are not separate from market value.

They help create it.

This is also why professional appraisal standards do not simply instruct appraisers to grab three nearby sales and average them.

Fannie Mae specifically requires appraisers to analyze changes in market conditions between the comparable's contract date and the effective date of the appraisal.

When market conditions have changed, a time adjustment may be warranted, and that adjustment must be supported by market evidence. Fannie specifically recognizes statistical analysis, modeling, paired sales and home-price indices as possible tools for supporting those adjustments.

Fannie also says comparable sales within the previous 12 months generally should be used, although older sales can be appropriate when they are genuinely more comparable or when a thin market provides few recent transactions. When older sales are used because market conditions have changed, those conditions must be explained.

In other words:

The appraisal system already recognizes that a sale occurring under different market conditions cannot automatically be treated as identical evidence of today's value.

The difficult part is measuring how much those conditions matter.

Interest rates are not a simple adjustment line

This is where the argument can easily go too far.

You cannot look at a house that sold for $300,000 at 4%, calculate that the payment-equivalent mortgage today would be $220,000, and declare the property worth $220,000.

That would be wrong.

Buyers make different down payments.

Household incomes change.

Cash buyers exist.

Inventory changes.

Population changes.

Construction costs change.

Insurance changes.

Taxes change.

Rents change.

Investors respond differently from owner-occupants.

Sellers make concessions.

Builders subsidize financing.

And existing homeowners with extremely cheap mortgages can reduce supply simply by refusing to sell.

Interest rates are therefore not a clean line-item adjustment like adding value for additional square footage or subtracting for condition.

They operate through the entire market.

That actually makes them more important to understand, not less.

The new-home market gives us a clue

Builders have been dealing with this problem more directly than most resale sellers.

Instead of relying exclusively on headline price cuts, many builders have used mortgage-rate incentives, closing-cost assistance and other concessions to make monthly payments work.

Why?

Because builders understand that buyers often purchase based on the payment they can carry.

The Mortgage Bankers Association reported in July that buyers had responded to incentives from builders trying to reduce unsold inventory.

By August, MBA reported that July new-home purchase applications were down 5.7% from a year earlier and specifically said weaker demand likely reflected increased homebuyer sensitivity to higher mortgage rates.

The property did not physically change between those months.

The economics surrounding the buyer did.

Existing homes have another complication

A builder generally has to sell inventory.

An existing homeowner often does not.

That distinction matters enormously.

A homeowner sitting on a 3% mortgage may simply decide that selling is financially irrational.

If enough owners make that choice, inventory remains scarce.

The few properties that do sell can maintain surprisingly high transaction prices even though many potential buyers can no longer afford them.

That creates an unusual market where:

Prices can remain high while affordability collapses.

Sales volume can fall while nominal values remain relatively stable.

Buyers can feel that homes are overpriced while sellers can correctly point to recent closed sales supporting their asking prices.

Those things can happen simultaneously.

It is one reason the Federal Reserve reported in July 2026 that existing-home sales had been moving sideways at very low levels for several years, with rate lock continuing to restrain transactions.

Low transaction volume makes the comp problem worse

This matters especially in smaller, rural or unusual markets.

Imagine trying to value a property for which only a handful of genuinely comparable homes have sold.

The appraiser or agent may have to expand geographically.

Or adjust for acreage.

Or condition.

Or age.

Or construction quality.

Or flood zone.

Or outbuildings.

Or reach farther back in time.

Every step introduces another variable.

Now add a major shift in financing conditions.

A comparable property from another rate environment may still be the best evidence available.

But its sale price should not be treated as though the market surrounding that transaction is irrelevant.

Fannie Mae explicitly allows older comparables in rural or low-volume markets for exactly this reason, while requiring the appraiser to explain their use.

The farther a transaction moves from the current market—geographically, physically or temporally—the more analysis becomes necessary.

Recent comps are different

There is another important distinction.

If a comparable sold three months ago to a conventional buyer in an arms-length transaction, that sale occurred under roughly the same high-rate environment buyers face today.

The interest-rate effect is already embedded in that transaction.

You would not normally subtract some arbitrary amount from it again because mortgage rates are high.

The market already cleared at that price.

The bigger question becomes what happens when we rely on transactions from materially different environments—or when today's recent sales are themselves being produced inside an unusually constrained market.

That is why saying simply that “rates aren't being considered in comps” misses the more interesting issue.

The market may be considering rates already.

But it is considering them through two competing forces:

Higher rates reduce buyer purchasing power.

Higher rates also suppress existing-home inventory.

One pushes values down.

The other can hold them up.

Which force wins depends on the particular market.

This is why price and affordability have separated

For decades, buyers naturally assumed that when financing became significantly more expensive, home prices would adjust downward.

Sometimes they do.

But the post-2022 housing market exposed a structural feature of the American mortgage system that previous rate cycles did not encounter at this scale.

A massive share of American homeowners secured long-term fixed-rate debt near historic lows.

Those loans stayed attached to the homeowners when rates increased.

The loans did not reprice.

So instead of forcing existing homeowners to absorb higher rates, monetary tightening primarily hit new buyers and anyone who needed to move.

That created two very different housing economies.

One homeowner might owe $300,000 at 3%.

Their neighbor might purchase an identical house with $300,000 financed near 7%.

The principal balance is identical.

The monthly economics are not even close.

Federal Reserve household data now show the consequence. Among homeowners with mortgages, those who moved during 2024 or 2025 reported a median mortgage payment of $2,300 per month, compared with $1,600 across homeowners with mortgages overall. In the South, recent movers reported a median of $2,250, compared with $1,550 overall.

That is the housing market buyers are actually living in.

What sellers should understand

A previous sale does not guarantee that the next buyer has the same financial capacity.

Neither does a Zestimate.

Neither does what the neighbor received two years ago.

Neither does what an owner “needs to get out of it.”

The relevant question is what buyers competing for that property today are willing and able to pay.

Sometimes scarce inventory allows the seller to command nearly the same price despite much higher financing costs.

Sometimes it does not.

Sometimes a house sits for months because the seller is anchored to a transaction produced by a buyer pool that no longer exists.

That is where days on market, price reductions, concessions, failed contracts and competing active listings begin telling us something that an old closed sale cannot.

Buyers should understand the opposite

High rates do not automatically mean every home is overpriced.

A buyer may look at the payment difference between 2021 and today and reasonably conclude that prices should have fallen substantially.

But if inventory remains constrained and several financially capable buyers still want the same property, the price may remain supported.

Market value does not care what the house should cost based on one variable.

It reflects the actual market.

That may not feel fair.

It can still be real.

And agents should stop treating a CMA like a calculator

A useful comparative market analysis should be explaining the market that produced the numbers, not merely presenting the numbers.

Three closed sales and an average price per square foot are not analysis.

They are inputs.

If mortgage rates have changed materially, inventory has shifted, days on market are climbing, seller concessions are increasing or buyers are withdrawing, those conditions belong in the conversation.

Fannie Mae's appraisal guidance is explicit that the appraisal represents a specific point in time and that comparable transactions must be analyzed for changes in market conditions between their contract dates and the valuation date.

Real estate pricing should be approached with the same seriousness.

The comp is not the value

This may be the most important distinction.

A comparable sale does not tell us what a house is worth.

It tells us something about what the market was willing to pay for another property at another moment.

From there, someone still has to interpret the evidence.

Sometimes the appropriate conclusion is that very little has changed.

Sometimes the conclusion is that the market has moved significantly.

And sometimes—like the current housing market—the evidence is contradictory.

Borrowing costs say one thing.

Inventory says another.

Payments say one thing.

Closed prices say another.

Sales volume says something else entirely.

That is not a failure of housing economics.

That is housing economics.

The United States moved from the cheapest mortgage money in modern history to rates approaching 7% while millions of owners kept mortgages below 4%.

We should not expect the market on the other side of that transition to behave normally.

And we should probably stop pretending that a transaction produced in one financing environment can always be carried into another without asking what changed.

Because buyers do not purchase houses in isolation.

They purchase the house, the financing, the insurance, the taxes, the repairs and the risk.

The physical property may be exactly the same.

The economics of owning it are not.

About the Author

I’m Dalton Barron, a licensed real estate agent serving Southwest Louisiana.

I spend a lot of time looking at real estate that never makes it into a listing description: ownership records, land assemblages, development plans, servitudes, zoning, infrastructure and the transactions happening before a project becomes public knowledge.

That same work carries over to my clients.

If you're trying to understand a piece of property, what it's worth, what is happening around it, or what the records actually say, bring me the address or parcel. I'll dig into it.

Buying or selling isn't a requirement.

Sometimes you just need somebody willing to look past the listing and into the file.

Dalton Barron
Real Broker, LLC
C. 337.764.1754
O. 855.450.0442
Licensed by the LREC
Main Office: Baton Rouge, LA

About 337.NEWS

337.NEWS is an independent Southwest Louisiana publication built around a simple idea: some local stories deserve more than the first answer.**

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