Low-Rate Mortgages Are Keeping Homeowners in Place and Weighing on the Housing Market

Nearly half of America’s outstanding mortgages are locked in at interest rates below 4%, a gap that could keep the housing market subdued for some time.

For many homeowners, selling means giving up a mortgage rate that may be hard to find again. With current borrowing costs above 7%, buying a similarly priced home could raise monthly housing expenses by hundreds of dollars.

The ripple effects go beyond individual households. When current owners decide not to list their homes, fewer properties reach the market, reducing options for buyers and making conditions more challenging for real estate investors.

A new Realtor.com analysis, based on Federal Housing Finance Agency mortgage data, shows how high rates and the ultra-low borrowing environment of the pandemic era continue to shape the U.S. housing market.

The Mortgage Lock-In Effect

In the second quarter of 2026, about 49% of outstanding mortgages had rates below 4%. Another 29% were between 4% and 6%, meaning nearly 78% of existing mortgages were below 6%.

The math can be striking. On a hypothetical $300,000 mortgage with a 30-year term, a 3.25% rate would result in a monthly principal-and-interest payment of about $1,306.

At 7%, that payment would rise to roughly $1,996. That is about $690 more each month, or $8,280 a year, before taxes and insurance.

For homeowners thinking about moving, that added cost can outweigh the appeal of a new property.

Robin B. Kirkman, a North Carolina real estate agent, told Realtor.com that some clients want to relocate but remain reluctant because of the difference between their existing mortgage rates and today’s borrowing costs.

Inventory Stays Constrained

The impact is especially visible in the age of outstanding mortgages.

The report says a record 43% of outstanding mortgages were originated between mid-2019 and mid-2022, when borrowing costs were near historic lows.

By contrast, only about 28% were originated during the four years ending in June 2026, reflecting weaker lending and refinancing activity.

That trend suggests many homeowners are choosing to keep favorable financing rather than replace it with more expensive debt.

For investors, tighter resale inventory can affect buying opportunities, pricing, and competition. At the same time, higher borrowing costs make investment-property financing more expensive, which can compress returns.

A Gradual Reset

Realtor.com expects the mortgage lock-in effect to persist into 2027.

Its forecast suggests that loans with rates of 6% or higher could make up about 27% to 29% of outstanding mortgages by mid-2027, up from roughly 23% in the second quarter of 2026.

Even then, most existing borrowers would still have mortgages below 6%.

There are signs of a slow adjustment. Home listing prices fell 1.4% in September, while available inventory edged up slightly.

Lower interest rates could eventually bring more owners into the market, boosting supply and giving buyers more choices.

Still, the unusually large share of low-rate mortgages suggests any recovery may be measured, even as newer, higher-rate loans gradually take a bigger place in the market.

If your mortgage rate is below 6%, would you be more likely to sell or stay put?