Should I give up my 3% mortgage rate to move?
Last updated August 31, 2026
Only if the move buys you more than the rate is worth, and you can find out what the rate is worth. Run your loan balance at your old rate, then run the same balance at the rate a lender quotes you today. The gap between those two payments is the price of moving. Put that price next to what the move gets you, and decide with both numbers on the table.
If you locked a rate under 4 percent, you hold something valuable. Your instinct to protect it is right. Protect it with a number, though, because you cannot make a good decision about an asset you refuse to price.
What is the mortgage rate lock-in effect?
The lock-in effect is the name economists gave to a simple trap. You hold a mortgage at a rate far below what a new loan costs. Moving means giving up that rate, so the cheap loan works like a fine for moving, and you stay. Millions of owners make the same choice at once, which is part of why so few homes come up for sale when rates sit well above the loans people already hold.
The personal version matters more than the economics. The house stopped fitting your life a while ago, and you keep it because the loan attached to it is cheap.
Treat the low rate as a real asset, because it is one. You cannot sell it and you cannot take it to the next house. It pays you one way: the payment money it saves on your balance, for the years you keep the loan. So measure exactly that.
How much is a 3% mortgage rate actually worth?
Start with an example. These are round numbers we picked to show the math. Your balance and your quoted rate will give a different answer, so run your own before you decide anything.
Say you owe $600,000 at 3 percent on a 30 year loan. Principal and interest come to about $2,530 a month. The same $600,000 at 6.5 percent costs about $3,792. The gap is about $1,263 a month, which is over $15,000 a year for the same borrowed money.
Two adjustments make that number honest.
First, count the years. The rate only saves you money for as long as you would have stayed. If you were five years from moving anyway, the asset is five years of savings.
Second, watch the balance. If the next house means borrowing more than you owe now, the extra borrowing costs the full new rate no matter what. Charge that cost to the bigger house. The old rate had nothing to do with it.
Run your real numbers in the payment calculator. Rates move every week. That is why we will not print one here and call it current.
What do people get wrong when they price this decision?
Four mistakes show up over and over. Two of them push people to move when they should stay. The other two hold people in place when they should go.
The payment gap is one side of the ledger. The other side is what the move buys you: room for the second kid, a commute that gives you back an hour a day, one story for knees that hate stairs, a street near your grandchildren. Those things have value even though no bank statement prints them, so put your own dollar figure on them. If the move buys you nothing you want, even a small payment increase costs too much. If it buys the next twenty years of your life, a big one can be cheap.
Your current tax bill rests on your assessed value under Prop 13, which can grow at most 2 percent a year. Buy a new house and the county assesses it at the price you paid. For a longtime owner that jump can rival the mortgage gap, and it lasts as long as you own the home. California gives one big exception. If you are 55 or older, Proposition 19 lets you carry your low tax base to a replacement home anywhere in the state. The deadlines are strict. Miss the two year window between the sale and the purchase and the benefit is gone. File the claim late and you lose the early years of savings. Estimate your own transfer with the Prop 19 calculator.
The equity in your house grows and shrinks with the house, and it buys you nothing while it sits there. It pays for none of the things you wanted the move for. Stay put to protect a 3 percent loan and a large share of your net worth stays parked in a life you no longer live. The rate has a price. So does that.
Assume rates stay high forever and you will overvalue the old loan. Assume they drop next year and you will overpay for the new house. Nobody knows which way rates go. If they fall after you buy, you can refinance, pay the closing costs on the new loan, and keep the house. That option is real, and nobody can promise it. Rates may never fall, a refinance costs money, and you have to qualify when you apply. Buy a payment you can live with if it never changes, and treat a refinance as a bonus.
When does keeping the low rate win?
Often. Keep the rate when the ledger says keep it, and the ledger says so in a few common cases.
The house still fits. If the move is a trade to a similar house in a similar area, the payment gap buys you almost nothing, so the rate wins easily.
The gap eats the reason for the move. Say the move is meant to fund a better life, and the new payment plus the tax reset swallows the whole margin that life needed. Find that out on paper before escrow finds it for you.
Your horizon is short. If this would not be your last move either, you would pay the rate premium twice. Skip the middle move, or wait until the next one is the last one.
Waiting can also be the right answer, as long as you wait on purpose. Pick a trigger, put a number on it, and check it once a year. That plan is one of the three exits we walk sellers through, next to listing on the open market and a verified cash offer.
If I do move, should I sell first or buy first?
The rate question decides whether you move. The order question decides how stressful the move gets. For most people the answer is sell first, because selling turns your equity into cash before you commit it, and it spares you two payments at once with one of them at the new rate.
Either way, start with the number that anchors the rest: what your house nets you after every cost. The free Equity & Exit Report gives you that for your address, with a projected list price, your net proceeds, and a real cash offer range.
One honest limit. We can price the rate, the taxes, and the net proceeds. We cannot price the hour a shorter commute gives back to your family, or what it is worth to sleep on the same floor you cook on. Put your own number on those. It is allowed to be large.
This is not tax advice, and it is not lending advice. Property tax results under Prop 13 and Prop 19 depend on your facts and your filings, so confirm them with your CPA and your county assessor. Loan terms, approval and refinance eligibility come from your lender. Get your actual figures in writing before you rely on them.
Should I give up my 3% mortgage rate to move?
Only when the move is worth more than the rate. Price the rate first. Take your loan balance and compare the monthly payment at your current rate against the same balance at the rate a lender quotes you today. That gap, over the years you would have stayed, is what you give up by moving. If a house that fits your life is worth more to you than that number, move. If it is worth less, keep the rate.
What is the mortgage rate lock-in effect?
The lock-in effect happens when homeowners hold mortgages at rates far below what a new loan costs. Moving means trading the old rate for a new one, so the cheap loan works like a fine for moving, and owners stay in houses that no longer fit their lives. The cost is real. Price it in dollars, then decide.
How do I calculate what my low mortgage rate is worth?
Run the same loan balance at both rates. Here is an example with round numbers. A $600,000 balance at 3 percent on a 30 year term costs about $2,530 a month in principal and interest. The same $600,000 at 6.5 percent costs about $3,792. The gap of about $1,263 a month is what the rate is worth on that balance. These are examples. Run your real balance and your real quoted rate, because the answer moves with both.
Can I refinance later if I buy at a higher rate?
Maybe. If rates fall, you can refinance, pay the closing costs on the new loan, and keep the house. Nobody can promise rates will fall, a refinance has its own costs, and you have to qualify when you apply. Buy a payment that works if it never changes, and treat a future refinance as a bonus.
Summary points
- A mortgage rate under 4 percent is a real asset. Its value is the payment gap on your balance between your old rate and a new one, for the years you would have stayed.
- Example with round numbers: $600,000 at 3 percent on a 30 year term runs about $2,530 a month in principal and interest, and about $3,792 at 6.5 percent. The gap of about $1,263 a month is the price of the rate on that balance.
- Compare whole lives, and count what the move buys: a shorter commute, one story, family nearby. A bank statement prints none of those.
- A new purchase resets your property tax base to the price you pay. Homeowners 55 and older can carry their low base to a replacement home under Prop 19, with strict deadlines.
- Equity in the current house buys nothing while it sits there. Protecting a cheap loan can mean parking your net worth in a life you no longer live.
- Rates could fall and they could stay. A later refinance is possible and never guaranteed, so buy a payment that works if it never changes.
- Keeping the rate wins when the move is a trade to a similar house, when the payment gap eats the reason for moving, or when this would be a middle move rather than a last one.