42.8% of U.S. Mortgages Are Locked Below 3%, and It's Freezing the Housing Market

Loans originated between mid-2019 and mid-2022, when mortgage rates dipped below 3%, now account for 42.8% of the U.S. market, according to a report released Thursday by Realtor.com. That concentration of ultra-cheap debt is the single biggest force pinning homeowners in place and throttling housing supply.

The mechanics are simple and brutal. The average 30-year fixed-rate mortgage has climbed as high as 7.6% in the recent surge. Anyone holding a sub-3% loan faces a monthly payment shock of historic proportions if they sell and rebuy, so they simply don't. It's the housing equivalent of golden handcuffs: the better your deal, the harder it is to walk away.

How big is the lock-in, exactly?

Nearly half of U.S. homeowners currently carry a mortgage rate below 4%, according to the latest figures from the Federal Housing Finance Agency. About one in five homeowners sits at a rate under 3%. In practical terms: if you're a buyer shopping today, you're competing for a thin slice of inventory, because roughly half of the owners who might otherwise list have a financial disincentive to move that didn't exist a generation ago.

The locked-in cohort includes two distinct groups, according to Hannah Jones, senior economist at Realtor.com. Some bought homes during the low-rate window. Others refinanced between 2020 and 2021 to capture those exceptionally low rates. "Homeowners are still making decisions around those unusually low rates today," Jones said in a statement. Many of those borrowers, she noted, have no natural payoff or move horizon in sight — a structural drag on the market, not a temporary one.

The other side of the ledger is growing, but slowly. Outstanding mortgages with rates above 6% currently make up 22.5% of the overall market. Jones projects that share could rise to as high as 28.5% by this time next year, since rates are likely to stay above that level. That's a six-point shift in twelve months — meaningful, but nowhere near enough to unwind the lock-in effect quickly.

What does this change for buyers and sellers?

For buyers, the calculus is an inventory squeeze with no fast fix. Jones argues the pandemic-era refinancing wave is aging into mortgage rate lock-in, which remains the dominant force in the housing market. "The rate unlock is real, but it's slow, as low-rate loans gradually age out, are traded up or paid off," Jones said. Translation: supply arrives at a trickle, not a wave.

For sellers who do list, less competition works in their favor. And the market hasn't ground to a halt despite the slowdown. "Even in today's high-price, high-rate market, homebuying activity around major life events, such as having kids, a job change, or a divorce, keeps the market in motion," Jones said. Life events, not rate arbitrage, are what's moving transactions right now.

What could loosen things up?

Jones laid out three levers. Lower mortgage rates would obviously help. Easing inflation might also spur more housing activity. And a larger inventory of homes for sale would relieve price pressure and reduce competition — pulling more buyers off the sidelines.

Don't hold your breath on timing, though. "However, the recent surge in mortgage rates has pushed expectations of recovery further afield," Jones said. Her broader read is that rates above 6% are the new normal for the foreseeable future, and market participants will adjust to that reality rather than wait for a return to 2020-era financing.

The so-what for practitioners: plan around a market where nearly half the housing stock is effectively off the transaction grid. The unlock is happening — 22.5% becoming 28.5% proves it — but it's measured in years, not quarters.