Locked Into a 3% Mortgage? The Real Math on Moving

DiscountAgent.com Blog • Seller Education

By Aaron Peters • Broker / Owner, DiscountAgent.com • August 2026

Updated: August 2026 • 13 min read

You refinanced into a 2.9% mortgage in 2021. Your family has outgrown the house. And every time you run the numbers on moving, the payment increase stops you cold.

You are not imagining it, and you are not alone. Surveys published in 2026 found that more than a third of homeowners with a rate under 6% say they would not give it up under any circumstances, and roughly 47% say they simply could not afford today’s borrowing costs. More than 40% say rates would have to fall below 4% before they would even consider selling.

This article runs the actual math on four Utah scenarios. For two of them, the honest answer is that moving costs meaningfully more every month and you should probably wait. For one of them, the entire premise of being “locked in” turns out to be wrong.

Commission matters here more than in a normal sale, because the money you do not pay in commission is the money you carry into the next house. But it does not erase the gap, and this article will not pretend it does.

Why the Trap Is Real

Start with a single number that explains the whole phenomenon. If you have a $360,000 balance at 3%, your principal and interest payment is about $1,518 a month. Here is what it would take to match that payment on a larger loan at today’s pricing:

New Loan Amount	Rate Needed to Match $1,518/mo	Realistic?
$400,000	2.19%	No
$450,000	1.34%	No
$500,000	0.60%	No

There is no rate the Federal Reserve can deliver that makes a bigger loan feel like your old one. Waiting for rates to fix this is waiting for something that is not coming. So the real question is not whether the payment goes up. It is whether the increase buys you something worth having, and whether you can reduce it.

Scenario 1: The Move-Up

You bought a $450,000 starter home in 2021 at 3.0%. It is worth roughly $607,500 today. You want a $655,000 home — the current Salt Lake County single-family median.

	Traditional 3% Listing	1.5% Listing
Listing commission	$18,225	$9,113
Net proceeds to carry forward	$245,925	$255,038
New loan at 6.10%	$409,075	$399,962
New payment	$2,479	$2,424
Increase vs. your $1,518 payment	+$961/mo	+$906/mo

The honest read: your payment goes up roughly $900 a month, and a discount listing does not change that. What it does change is that you keep about $9,100 more of your own equity — enough to cover about ten months of the increase, or to buy down the new rate. If a $900 monthly increase does not work in your budget, no commission structure fixes that. Wait, or look at a smaller move.

Scenario 2: The Lateral Move

Same house, same 3.0% rate — but this time you are moving to a different home at roughly the same $607,500 price. New school boundary, shorter commute, closer to family.

Traditional 3%

+$673/mo

$2,191 vs. $1,518

1.5% Listing

+$618/mo

$2,136 vs. $1,518

This is the scenario most people underestimate. Buying the same house across town still costs about $620 more per month, purely because your 3% rate does not travel with you. If the move is about preference rather than necessity, this is the math that should give you pause.

Scenario 3: The Downsize — Where Lock-In Turns Out to Be a Myth

Here is the finding that surprised us. Take an empty-nester who bought a $525,000 home in 2020 at 3.25%, now worth about $708,750, moving to a $550,000 home.

Current payment at 3.25%

$1,828

New payment at 6.10%

$1,530

Monthly change

−$298

The payment goes down by about $300 a month — while more than doubling the interest rate. Equity beats rate when the loan shrinks enough. Push the downsize further, from a $600,000 purchase at 2.99% to a $500,000 home, and the payment drops by more than $1,000 a month.

If you are downsizing, you are not locked in. You may have absorbed a narrative built for move-up buyers and applied it to a situation where it simply does not hold. The commission savings here are pure addition — roughly $10,600 that stays in your pocket on a $708,750 sale rather than funding a listing fee.

Scenario 4: You Do Not Actually Have a Choice

A job relocation. A divorce. A death in the family. A new baby in a two-bedroom condo. Aging parents who need you closer. Real estate agents nationwide report that these life events, not rate forecasts, are what actually move locked-in owners.

If you are in this group, the comparison changes entirely. You are no longer weighing your 3% rate against 6.1% — you are deciding how to execute a move that is happening either way. Every dollar of commission becomes a dollar of buying power in the next house.

What a 1.5% listing keeps in your pocket

Your Sale Price	3% Listing Fee	1.5% Listing Fee	Extra Equity You Keep
$500,000	$15,000	$7,500	$7,500
$655,000	$19,650	$9,825	$9,825
$750,000	$22,500	$11,250	$11,250
$870,000	$26,100	$13,050	$13,050

Listing side only. Buyer agent commission is separate and negotiated per transaction. Commission rates are negotiable and not set by law.

The Move That Actually Shrinks the Gap

Most sellers treat commission savings as a rounding error absorbed into the down payment. There is a better use: apply it to discount points on the new loan and permanently reduce the rate you were dreading.

You Sell For	Commission Saved	New Rate After Points	Monthly Reduction
$607,500	$9,112	6.10% → 5.53%	−$145/mo
$708,750	$10,631	6.10% → 5.52%	−$169/mo
$870,000	$13,050	6.10% → 5.56%	−$208/mo

Assumes 0.25% rate reduction per discount point. Actual lender pricing varies. Estimates only.

On the move-up scenario, that turns a $906 monthly increase into roughly $761. It does not close the gap, but it is a permanent reduction funded entirely by money a traditional listing would have consumed. Full breakdown of the buydown math, including break-even.

And if you are buying your next home in Utah: the buyer side has its own lever. A 50% buyer commission rebate on a $655,000 purchase returns roughly $8,188 — which can also go toward points, stacking on top of the listing savings. How the buyer rebate works.

So Should You Move?

Yes, probably — if you are downsizing

The math frequently favors you outright. Run your actual numbers before assuming the rate makes it impossible, because it often does not.

Yes — if life is forcing the move anyway

Job, family, health, divorce. The rate comparison is irrelevant; the only question left is how efficiently you execute. Protect the equity.

Maybe — if you are moving up and can absorb the payment

Roughly $900 more per month on a median move-up. If that fits comfortably and the house solves a real problem, the rate you leave behind is a sunk consideration. If it strains you, it is not worth it.

Probably not — if it is a lateral move for preference

Paying roughly $620 more per month for an equivalent house is a real cost for a preference. That is a legitimate choice — but make it with the number in front of you.

One argument against waiting. If rates do fall meaningfully, the buyers currently sitting on the sidelines come back at the same time, and Utah inventory has been tight for years. Lower rates with more competition can easily cost more than a higher rate with fewer bidders. Nobody can tell you which way that nets out — but “wait for rates” is a strategy with its own risk, not a safe default.

FAQ: Selling With a Low Mortgage Rate

It describes homeowners staying put because selling means giving up a low mortgage rate for a much higher one. Surveys in 2026 found more than a third of owners with sub-6% rates say they would not give them up under any circumstances, and over 40% say rates would need to fall below 4% before they would consider selling. It is a major reason housing inventory has stayed tight.

It depends far more on the direction of your move than on the rate. Downsizing often lowers your payment even at today’s rates because the loan shrinks. A median move-up in Salt Lake County adds roughly $900 a month. A lateral move to a similar-priced home still costs about $620 more monthly. Run your specific numbers rather than assuming.

Frequently, yes. In our modeled example, an owner moving from a $708,750 home at 3.25% to a $550,000 home at 6.10% saw the payment fall by roughly $298 a month. A larger downsize dropped it more than $1,000. Enough equity applied to a smaller loan can outweigh a doubled interest rate.

No, and any agent claiming otherwise is overselling. On a median move-up, a 1.5% listing instead of 3% reduces the monthly increase from about $961 to about $906. What it genuinely does is keep roughly $9,800 more of your equity — which can cover about ten months of the increase or buy down the new rate permanently. It narrows the gap; it does not close it.

Waiting carries its own risk. No realistic rate makes a larger loan match a 3% payment — matching a $1,518 payment on a $450,000 loan would require about 1.34%. And when rates fall, sidelined buyers return simultaneously, which can raise prices and competition. Waiting is a strategy with tradeoffs, not a safe default.

Yes, with lender approval, and it is usually the strongest use. Roughly $9,100 saved on a $607,500 sale buys about 2.28 discount points on a $400,000 loan, cutting 6.10% to about 5.53% and lowering the payment around $145 a month permanently. See the full buydown analysis.

No — industry data shows buyer agent commissions have edged slightly upward since the settlement. The settlement gave you the right to negotiate; it did not lower anything automatically. Savings still require choosing a lower-cost broker. Our full breakdown of what the settlement did and did not change.

Call or text 801-243-8900 or email Aaron@DiscountAgent.com. You will get a current value estimate for your home, realistic net proceeds after all costs, and an honest read on the payment change — including when the answer is that waiting makes more sense. No pressure and no obligation.

Disclaimer

All figures are illustrative estimates based on modeled scenarios, not quotes. Payments shown are principal and interest only and exclude property taxes, insurance, HOA dues, and mortgage insurance. Home values, appreciation, loan balances, and rate pricing vary by situation and lender. This is not mortgage, financial, or tax advice. Consult a licensed loan officer for actual rate and payment quotes.

DiscountAgent.com is not a real estate brokerage. It is the marketing website of Aaron Peters, a licensed Utah real estate agent. Services are provided through NetLogix Realty, License #6390407-AB00. Commission rates are negotiable and are not set by law. Utah is a non-disclosure state; figures shown are approximate.

The lock-in effect is real, and for move-up buyers the arithmetic is genuinely hard. But a large number of Utah homeowners have concluded they are stuck without ever running their own numbers — and for downsizers in particular, that conclusion is often simply wrong.

Find out what your situation actually looks like. Call or text 801-243-8900 or email Aaron@DiscountAgent.com. If the honest answer is that you should wait, that is what you will hear.

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Locked Into a 3% Mortgage? Here's the Actual Math on Whether You Can Move