Prop 19 for Move-Up Buyers

Last updated: July 2026

If you've owned your California home a long time, your property tax bill is probably a lot lower than a fresh buyer would pay for the same house — that's Proposition 13 at work. Selling and buying somewhere else usually means giving that up and starting over at the new purchase price. Proposition 19 changes that calculation for a specific group of owners. Here's how it works, what it's actually worth, and how it fits into the bigger decision of whether to sell your current home or keep it as a rental.

What Prop 19 does

Effective April 1, 2021, Proposition 19 lets eligible homeowners transfer their existing, Prop 13-protected assessed value — their “base year value” — to a replacement primary residence anywhere in California, instead of having the new home fully reassessed at its purchase price. Eligible owners can use this up to three times.

Who qualifies

The base-year transfer is available to owners who are 55 or older, severely and permanently disabled (of any age), or victims of a wildfire or other qualifying natural disaster. You generally need to sell your original home and buy the replacement within two years of each other to qualify.

The mechanics

The math depends on whether your replacement home costs more or less than the one you sold. Buy a home at or below your old sale price, and your existing base value transfers over completely unchanged — your tax bill on the new home stays exactly where it was. Buy a more expensive replacement — the “move-up” case this guide is about — and only the price difference gets newly assessed: your new taxable base equals your old base value plus the amount by which the replacement costs more than your sale price. You don't get reassessed on the full new purchase price, just the increment above what you sold for.

A worked example

Say a 62-year-old homeowner sells a home for $900,000. Thanks to decades of Prop 13 protection, its factored base value is only $300,000. They buy a $1,100,000 replacement — a $200,000 “buy-up” above the sale price. Under Prop 19, the new taxable base is $300,000 + $200,000 = $500,000, not the full $1,100,000.

At the county's blended effective rate of roughly 1.10%, that's about $5,500 a year in property tax with the Prop 19 transfer, versus roughly $12,100 a year on a fresh reassessment of the full $1,100,000 purchase price — a difference of about $6,600 a year. These are illustrative figures using a hypothetical example and the site's blended estimate tax rate, not a quote for any specific property.

Sell your old home, or keep it as a rental?

Here's the part that trips people up: Prop 19's base-value transfer only applies if you actually sell your original home. If you keep it and rent it out instead — a common move-up strategy — you keep that property's own low tax basis (nice for the rental's cash flow), but you don't get to carry it forward to the new home. The new purchase gets a full, fresh reassessment with no Prop 19 offset.

That's a genuine trade-off, not a clear-cut answer: sell and transfer your tax base versus keep the rental's low basis and take the new home's full assessment, partly offset by rental income. sounding's own move-up mode is built to model both paths side by side — it treats a portion of expected rent (the same 75% haircut a lender typically applies) as qualifying income if you keep the old home, so you can compare the combined monthly picture against selling and using a Prop 19 transfer instead. It shows you both numbers; it doesn't tell you which path is right for your situation, which depends on more than the tax math alone.

Model your move-up with Prop 19 in the picture

Keep your current home and rent it out, or sell and carry your tax base forward — see both, for this exact address, free.

Try move-up mode ↑

Source: California State Board of Equalization — Proposition 19. This is general information, not legal or tax advice — a tax professional can confirm how Prop 19 applies to your specific situation.

← Back to sounding