Should You Give Up Your 3% Mortgage to Move in Southern California?

If you bought or refinanced your Southern California home between 2020 and 2022, there is a reasonable chance you have a mortgage rate somewhere between 2.5% and 3.5%. And if you have been thinking about moving — upsizing, downsizing, relocating within the region, or getting closer to family — you have probably done the math and felt the sting.

A new mortgage at today's rates would cost significantly more per month for the same loan amount. That gap is real, and it is keeping a lot of homeowners in place who might otherwise move.

But the decision is more complicated than a single rate comparison. Here is how to think through it honestly.

The Rate Lock-In Effect Is Real

The Federal Reserve Bank of San Francisco and other researchers have documented what economists call the "lock-in effect" — the tendency of homeowners with below-market mortgage rates to stay put rather than sell, because selling means giving up a rate they cannot replicate.

In Southern California, where home prices are among the highest in the country and monthly payments are highly sensitive to rate changes, this effect is particularly pronounced. A homeowner with a $700,000 mortgage at 3.0% has a principal and interest payment of approximately $2,952 per month. The same loan balance at 7.0% would cost approximately $4,657 per month — a difference of over $1,700 every month.

That is a real cost. It is rational to factor it into your decision.

But the Rate Is Not the Only Number That Matters

The rate comparison is the most visible part of the calculation, but it is not the whole picture. Here are the other variables that matter:

Your equity. If you have owned your Southern California home for several years, you have likely accumulated significant equity — both from appreciation and from principal paydown. That equity is a financial asset. When you sell and buy, you bring that equity to the new purchase, which reduces your new loan balance. A homeowner with $400,000 in equity buying a $900,000 home needs a $500,000 mortgage, not a $900,000 one. The rate applies to the loan balance, not the purchase price.

The price of the home you are moving to. If you are downsizing — moving from a larger, higher-priced home to a smaller, lower-priced one — you may be able to reduce your loan balance significantly, potentially offsetting much of the rate increase. If you are upsizing into a more expensive home, the rate increase compounds with the higher balance.

Your carrying costs in your current home. Your current home has costs beyond the mortgage: property taxes, insurance, maintenance, HOA fees if applicable. If your current home is larger than you need, or requires significant maintenance, or has rising insurance costs, those costs are part of the comparison too.

Your life circumstances. Financial calculations do not capture everything. A move that gets you closer to aging parents, into a better school district, or out of a commute that is costing you hours every week has real value that does not show up in a spreadsheet. These factors are legitimate inputs into the decision.

The opportunity cost of staying. Staying in a home that no longer fits your life has costs too — practical, emotional, and sometimes financial. A home that is too large, too far from work, or no longer suited to your household is not a free option just because the mortgage rate is low.

Running the Real Numbers

The most useful exercise is to build a side-by-side comparison of your current situation versus the move scenario. Here is what to include:

Current situation:

• Current monthly mortgage payment (P&I)
• Current property taxes and insurance
• Current HOA fees if applicable
• Estimated annual maintenance costs
• Remaining loan balance and years left on the mortgage

Move scenario:

• Estimated sale price of your current home
• Estimated net proceeds after agent commissions, closing costs, and mortgage payoff
• Purchase price of the target home
• Down payment (your net proceeds, or a portion of them)
• New loan balance
• New monthly payment at current rates
• New property taxes (reassessed at purchase price under California Prop 13 rules)
• New insurance and HOA costs

The difference in monthly carrying costs between the two scenarios is the real cost of moving. Whether that cost is worth it depends on what you get in return.

Options Beyond the Binary

The choice is not always "stay forever" or "sell and buy at today's rates." There are other paths worth considering depending on your situation:

Rent your current home and buy another. If your current home has strong rental income potential and you can qualify for a new mortgage while carrying the existing one, renting rather than selling preserves your low-rate mortgage while allowing you to move. This requires qualifying for both mortgages simultaneously, which depends on your income, debt-to-income ratio, and the rental income documentation requirements of the new loan program. It is not the right answer for everyone, but it is worth exploring.

Access your equity without moving. If what you actually need is cash — for a renovation, a family expense, or another purpose — a HELOC or cash-out refinance may let you access your equity without giving up your first mortgage rate. See our article on HELOC versus cash-out refinance for how to compare these options.

Wait for your circumstances to change. If rates decline meaningfully over the next few years, the cost of moving decreases. If your equity continues to grow, your down payment on the next home increases. Waiting is a legitimate strategy if your current home still works for your life.

No Rate Forecasts

I am not going to tell you where mortgage rates are headed. No one knows. Rates could decline, stay flat, or rise further. Making a major housing decision based on a rate forecast — yours or anyone else's — is not a sound approach.

What I can tell you is that the decision to move or stay should be based on your actual financial situation, your life circumstances, and a clear-eyed comparison of the real costs and benefits — not on waiting for a rate that may or may not arrive.

The Bottom Line

Giving up a 3% mortgage is a real financial cost. In Southern California, where loan balances are large and monthly payments are sensitive to rate changes, that cost can be substantial. It is rational to take it seriously.

But it is not the only number in the calculation. Your equity, your target home's price, your carrying costs, and your life circumstances all belong in the analysis. For some homeowners, the math works out better than they expect. For others, staying put is genuinely the right financial decision. The only way to know is to run your specific numbers.

If you want to work through the comparison for your situation, contact us or schedule a call. There is no cost to understanding your options.

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NMLS Individual #1087365 · NMLS Company #1147207 · CA DRE #01265685. SMS Mortgage is a licensed mortgage broker in California and Colorado. Stephanie Pedley holds individual MLO authorizations in Texas through B Walters CO., LLC (NMLS #262157), Ohio through Beacon of Hope Residential LLC (NMLS #2543671), and Nevada through CASMIA HOLDING LLC (NMLS #1740673). Not a commitment to lend. All loans subject to credit approval.