Prop 19 explained: keep your tax base when you sell
Last updated August 19, 2026
If you are 55 or older, Proposition 19 lets you take your low property tax basis with you when you move, to a replacement home anywhere in California. If you bought decades ago, that basis is probably a fraction of what a new buyer would pay on the same house today, so it is worth real money every year you own the next one. The rules have deadlines, and missing one costs the benefit permanently.
What Prop 19 actually does
Before Prop 19, moving to a new home in California generally meant your property taxes were reassessed at the new home's full market value, no matter how low your old tax basis was. For a longtime owner, that could mean a tax bill several times higher, permanently.
Proposition 19, passed in 2020, changed this for homeowners 55 or older, severely disabled homeowners, and victims of wildfire or natural disaster. It lets you carry your existing, lower property tax basis to a replacement home anywhere in California, even if the new home costs more than the one you sold.
You do not have to choose between moving and keeping the tax bill you have earned by staying put. Done correctly, you take your low basis with you.
How the transfer actually works
- You must be 55 or older (or severely disabled, or a qualifying disaster victim) at the time you sell your original home.
- The replacement home can be anywhere in California, not just the same county, and can cost more than your original home.
- If the new home costs more, the difference in value is added to your transferred tax basis at current rates. You are not taxed on the full new value, only on the increase above what you sold for.
- You can use this up to three times in your lifetime.
- Timing matters. You generally must purchase the replacement home within two years of selling the original, whether you buy first or sell first.
Already have a replacement home in mind? See what the actual monthly payment looks like with Mortgage vs Rent, our free buyer calculator.
Where owners lose the benefit
The rules around sequencing and deadlines are unforgiving. Buy or sell outside the qualifying window, misjudge how the value difference is calculated, or file the required claim late with the county assessor, and the low tax basis can be lost permanently, with no way to reclaim it later. This is exactly the kind of detail that decides whether selling now or waiting is the better financial move, and it is rarely explained clearly before someone lists their home.
This is general information, not tax or legal advice. Confirm your specific numbers and timing with a qualified tax professional or your county assessor before you act.
You are 55 or older, have owned your home a long time, and want to move (downsize, relocate closer to family, or upgrade) without a permanent tax increase.
You are close to the two-year window, considering a home significantly above your current value, or unsure how many times you have already used the transfer.
The only way to know your real numbers, your current tax basis, your projected transfer, and what a sale nets you after every fee, is to see them laid out for your specific home.
Can I keep my low property tax base when I sell in California?
Yes, if you are 55 or older, Proposition 19 lets you transfer your current property tax basis to a new home anywhere in California, even one that costs more, as long as you meet the timing rules.
How many times can I use the Prop 19 tax base transfer?
Homeowners 55 or older can use the Prop 19 base year value transfer up to three times in their lifetime.
Does Prop 19 only apply if I buy a cheaper home?
No. You can buy a more expensive home and still transfer your tax base, though the portion of the new home's value above your old home's value is added to your transferred base at current tax rates.
Summary points
- If you are 55 or older, Proposition 19 lets you carry your existing low property tax basis to a replacement home anywhere in California.
- It also covers severely disabled homeowners and victims of wildfire or natural disaster.
- The replacement home can cost more than the one you sold. The difference in value is added to your transferred basis at current rates, so only the increase is taxed at today's value.
- You can use the transfer up to three times in your lifetime.
- You generally have two years between the sale and the purchase, in either order.
- Miss the window or file the claim late with the county assessor and the low basis is gone permanently. This is not tax advice. Talk to your CPA.