The couple who bought a $750,000 Bay Area home in 2015 has, eleven years later, about $892,000 in net cash if they sell today. Equity. After the mortgage payoff, after selling costs, after capital gains tax. Built almost entirely from making a housing payment they had to make anyway.
A renter paying $4,500 a month over those same eleven years also paid for housing — but walked away with no asset to show for it. The 2015 buyer paid roughly the same monthly cost and ended with $892,000.
That's the case for getting in. Not perfectly, not at the bottom, not when rates feel right. Just in. The system rewards homeowners over time, sometimes spectacularly, even in markets that look impossible from outside.
Which makes what comes next interesting. Because the same forces that built that $892,000 in equity are the forces holding inventory off the market today.
You've probably noticed there are almost no homes for sale. Not "fewer than usual." Twelve days from list to sold in much of the Bay Area. Twenty-three percent over asking on average for San Francisco single-family homes last month. Inventory in some counties down 34% year-over-year. The market isn't slow. The market is empty.
The standard explanation is that homeowners locked in low mortgage rates during the pandemic and don't want to give them up. That's true. It's also incomplete.
For Bay Area homeowners specifically, there are three locks holding inventory in place — not one. The second and third are larger than most buyers realize.
Lock one: the mortgage rate.
Take that 2015 couple. They bought at 3.85%, refinanced in 2021 at 2.875%. Their current monthly principal and interest is about $2,180.
If they sold and bought a $2 million home today at 6.25% — putting nearly half down with the equity from their sale — their new principal and interest would be about $6,822 per month. The rate alone, applied to a larger loan, costs them roughly $4,640 more every month than they pay now. About $55,700 a year. (6.25% reflects late-April 2026 conditions; your rate will vary based on credit, loan size, and debts.)
This is the lock everyone talks about. It's real.
Lock two: the property tax.
Proposition 13, passed in 1978, caps the annual increase in a home's assessed value at 2% per year — until ownership changes. At change of ownership, the home is reassessed at current market value, and a new base is set.
The 2015 couple's assessed value today, after eleven years of capped 2% increases, is about $933,000. At San Francisco's effective rate of roughly 1.18% — the 1% Proposition 13 base plus voter-approved bonds — they pay around $11,000 per year in property tax.
The same couple buying a $2 million home today would be reassessed at $2 million. Year-one property tax: about $23,600. That figure then grows at up to 2% per year, indexed forever.
The property tax line alone costs them an additional $12,500 every year. Permanently. It does not refinance away if rates drop. It does not get smaller with a larger down payment. It is the part of the move that cannot be undone.
Lock three: the capital gains tax.
The IRS lets a married couple exclude $500,000 of gain on the sale of a primary residence under Section 121. That sounds generous until you run the numbers on a Bay Area home owned for a decade.
Sale price: $1.5 million. Selling costs at six percent: $90,000. Net proceeds: $1.41 million. Cost basis: $750,000. Realized gain: $660,000. Subtract the $500,000 exclusion. Taxable gain: $160,000.
Federal long-term capital gains at the 20% bracket: $32,000. Net Investment Income Tax at 3.8%: $6,080. California, which taxes capital gains as ordinary income at 9.3% in the relevant bracket: $14,880.
Total tax owed at the moment of sale: about $53,000.
That's not a monthly cost. It's a one-time cost extracted from the equity before any of it gets deployed into the next home.
The sum of the three.
Walk through the full move. The 2015 couple sells their $1.5M home, nets $1.41M after selling costs, pays off their $465K mortgage, hands the IRS and California $53K, and walks away with about $892,000 in cash. They put it all into a $2M home, take out a $1.108M loan at 6.25%, and pay $23,600 a year in property tax.
Their housing cost goes from about $3,100 per month to about $8,800 per month. About $68,300 more every year, indefinitely. Plus the $53,000 they handed the government on the way out.
A skeptic could argue any one of these locks individually. Rates might come down. Property tax bills are the price of upgrading. Capital gains is the cost of having made money.
The point isn't that any one lock is unfair. The point is that all three apply at the same time, to the same transaction, to the same household — and most analyses of "why won't anyone sell" address only the first.
The market isn't broken. The math is working exactly as designed. Three different policy decisions, each defensible on its own, compound at the moment a long-tenured owner considers selling. The result is the inventory you see — or rather, the inventory you don't.
Here's the quieter implication. Every one of the three locks holding today's sellers in place is a lock that protects today's buyers once they get in. Every year you own is a year of capped property tax, of a fixed mortgage payment in a market where rents climb, of a $500,000 exclusion accruing in your name. The system that looks impossible from outside looks different once you're on the other side of it.
For a first-time buyer in 2026, this is the floor of the situation. Not a temporary condition that resolves when rates fall. A structural feature of how the Bay Area housing market is now organized.
Plan for the inventory you'll actually see. And if the math is close, get in imperfectly rather than wait for perfect.
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When you're ready to run your numbers, TheMortgageLens.com is where I send people. Your real income, your real debts, your real credit. No phone call, no follow-up.
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