Prop 19 Explained: How to Carry Your Property Tax Base to a New Home

Almost every client over 55 asks me some version of the same question: "If I sell my house, am I going to lose my low property tax bill?" The answer is usually no — but the rules changed a few years ago, and most people are still working off the old version.

I've explained this so many times that I genuinely know it cold. I'm also a licensed California attorney, so when people ask me this, they're not getting a guess — they're getting the actual mechanics. I've done this transfer myself, on my own house, so I know the form number too.

The old rules: Prop 60 and Prop 90

Before 2021, homeowners 55 and older could transfer their assessed value under Prop 60 (same county) or Prop 90 (only in counties that opted in to accept transfers from elsewhere). Both had a hard rule: your replacement home had to be of equal or lesser value than the home you sold. If it cost even $100 more, you got nothing — you were fully reassessed at the new purchase price.

That rule didn't make a lot of sense in practice. It punished people for moving up even slightly, and it only worked if you happened to be moving within — or into — the right county.

What Prop 19 actually changed

Prop 19 passed in November 2020 and took effect April 1, 2021, replacing Prop 60 and Prop 90. Two big changes:

1. Any county, not just same-county or opt-in counties. You can transfer your tax base anywhere in California now.
2. No more equal-or-lesser-value cliff. If your replacement home costs more, you don't lose the benefit — you just pay tax on the difference.

Here's the math, the way I walk clients through it:

Say you sell your home for $1,000,000, and your old assessed value was $400,000.

• Buy a home for $800,000 (less than what you sold for): you carry your full $400,000 assessed value. Simple.
• Buy a home for $1,200,000 (more than what you sold for): you carry your $400,000 assessed value, plus the difference between your sale price and purchase price. In this example that's $200,000, so your new assessed value is $600,000 — not the full $1.2M purchase price.

Under the old Prop 60/90 rules, that second example would have gotten you nothing at all. You'd have been reassessed at the full $1.2 million. Prop 19 fixed that.

You also get up to three transfers under Prop 19 (the old rules generally allowed it once), and there's no limit for victims of a declared disaster like a wildfire.

Why this matters more than people think

People hear "property tax transfer" and assume it's a minor detail. It's not — it's often the difference between a move being financially comfortable or financially painful. I've had clients who were staying in homes that no longer fit their life — too many stairs, too much yard, too far from family — purely because they were scared of losing a tax base they'd built up over 20 or 30 years. Once they understand Prop 19, that fear usually goes away.

A word on the form

When my wife Janet and I did our own transfer, I filed the paperwork myself and it took about six months to process. You pay taxes at the new assessed rate in the meantime and get a credit once it's processed — so don't panic if your first bill looks wrong. It catches up.

If you're thinking about a move and want to know exactly what your numbers would look like under Prop 19, reach out and I'll walk you through it — same way I would for any client sitting across the table from me.

This is general information, not legal or tax advice. Every situation has its own facts — confirm your specifics with the county assessor or your own attorney/CPA before making a decision.