Prop 19, in plain English
Over 55 and thinking about moving? You can take your low property-tax base with you — anywhere in California, up to three times. Done right, it saves thousands a year for life. Done wrong, or ignored, it can cost six figures. Here's how it actually works.
Your 1980s-or-1990s tax bill can move with you
Under Proposition 13, your property taxes are based on what you paid for your home (plus small annual increases) — not what it's worth today. If you bought in Cupertino in 1994, you might be paying taxes on a taxable value of $180,000 while your neighbors who just bought pay taxes on $2.6 million.
For decades, that low tax bill was a reason not to move — the "golden handcuffs." Proposition 19 unlocked them. If you're 55 or older (or severely disabled, or displaced by wildfire/disaster), you can transfer that low taxable value to your next primary residence:
- Anywhere in California — all 58 counties, not just a participating few like the old rules
- Up to three times in your lifetime
- Even to a more expensive home — with a fair adjustment (examples below)
- As long as the replacement is purchased or built within two years of your sale
Why this matters in dollars: a $1.5M replacement home normally means roughly $17,000+/year in property taxes for a new buyer. Carry over a $180,000 base and you keep paying roughly $2,000/year. That's ~$15,000/year, every year, for as long as you own the home.
Real examples, real numbers
Example 1 — Trading down (the classic downsizer)
| Item | Amount |
|---|---|
| Cupertino home, bought 1994 — current taxable value | $180,000 |
| Sells for | $2,600,000 |
| Buys Santa Cruz condo for | $1,500,000 |
| New taxable value with Prop 19 | $180,000 |
| Annual property tax with Prop 19 (approx.) | ≈ $2,000 |
| Annual tax without the transfer (approx.) | ≈ $17,000 |
Buying equal or down: your old taxable value transfers as-is.
Example 2 — Trading up (yes, you can)
Trading up doesn't cost you the whole difference. The law lets your replacement exceed the original's market value by 105% if you buy within one year of the sale, or 110% in the second year, with none of that excess added to your base. Only the amount above the threshold gets added.
| Item | Amount |
|---|---|
| Sells longtime home for | $2,600,000 |
| Buys replacement for | $3,000,000 |
| 105% allowance (buying within one year of the sale) | $2,730,000 |
| Excess above the allowance ($3.0M − $2.73M) | $270,000 |
| Old taxable value | $180,000 |
| New taxable value with Prop 19 | $450,000 |
A brand-new buyer of the same $3M home would be assessed at $3,000,000. You: $450,000. Roughly $28,000/year less in property tax.
This is where sequence costs real money. The same two homes produce three different tax bases depending on when you buy:
| How you sequence it | New taxable value |
|---|---|
| Buy within one year after selling (105% allowance) | $450,000 |
| Buy in the second year after selling (110% allowance) | $320,000 |
| Buy before you sell — allowance drops to 100% | $580,000 |
That's a $260,000 spread in assessed value on identical transactions — roughly $2,900 a year, forever, decided purely by timing. Worth mapping before you commit to either side of the move.
To be precise about the mechanics: only the excess over the allowance is added to your base, never the full price difference. In the buy-first row those happen to be the same number, because the allowance is exactly 100% of what the original sold for. Buying first also costs you a second way — you pay full market-rate property tax on the new home until the old one closes, with no refund.
The calculator does the 100/105/110% math for you and shows all three timing scenarios side by side.
The rules that trip people up
- Both homes must be your primary residence. Rentals, second homes, and investment properties don't qualify for the 55+ transfer.
- The two-year window is firm. Buy (or complete construction on) the replacement within two years of selling — before or after.
- File the claim. The transfer isn't automatic — you file with the county assessor where the new home is. File within three years of purchase to preserve full relief.
- Sequence matters when trading up. Buying after you sell earns you a 105% allowance in year one, or 110% in year two, before any excess is added. Buying before you sell gets no allowance at all — the full difference is added to your base. On a $2.6M-to-$3M move that's a $130,000 difference in assessed value.
The other side of Prop 19: inherited homes
The same law that gave 55+ owners portability also removed most of the old parent-child reassessment exclusion. Since February 16, 2021, a home left to children keeps its low tax base only if a child moves in as their primary residence within one year — and even then, the protection is capped. The excluded amount is the old assessed value plus $1,044,586 for transfers dated February 16, 2025 through February 15, 2027; market value above that sum gets added to the taxable value. (The Board of Equalization re-indexes that allowance every two years — it was $1,000,000 in 2021 and $1,022,600 in 2023, so the figure that applies is the one in effect on the date of death.) An inherited home kept as a rental is fully reassessed at market value.
There's also a clock most families never hear about: the child has to be living there and have filed for the homeowners' exemption within one year of the death. Miss it and relief only starts in the year you file — you don't get the intervening years back. Run the free Deadline Clock to see every date that applies to your situation.
For many families, that flips the old "keep the house for the low taxes" logic on its head. If you've inherited a home — or you're planning what happens to yours — the numbers deserve a hard look. See the Trust & Estate Sales guide, and bring your estate attorney into the conversation early.
Honest disclaimer, CFO-style: I'm a broker, not your CPA or attorney. Prop 19 has edge cases (multi-owner homes, trusts, partial interests, disaster rebuilds). I'll run your numbers, coordinate the filing, and work directly with your tax and legal advisors — who always have the final word.
Prop 19 FAQ
Do both my spouse and I need to be 55?
No — only one spouse who is an owner and occupant needs to be 55 or older at the time the original home sells.
Can I move to another county?
Yes. That's the biggest change from the old Props 60/90: the transfer now works in all 58 California counties. Silicon Valley to Santa Cruz, to Sacramento, to San Diego — anywhere in the state.
Can I buy my next home first, then sell?
Yes — the two-year window runs both directions. Buy first and sell within two years, or sell first and buy within two years. (When trading up, the price-comparison math applies small adjustments depending on timing — worth mapping before you commit.)
How many times can I use it?
Up to three times for homeowners 55+ (no limit for disaster-displaced homeowners).
Does Prop 19 help with capital gains taxes too?
No — Prop 19 is property tax only. Capital gains are a separate calculation (basis, improvements, the §121 exclusion, federal + state rates). The Net Proceeds Calculator handles that side honestly.
What form do I file?
The base-year transfer claim (BOE-19-B for 55+) is filed with the assessor in the county of your new home. I prepare and coordinate this filing with every eligible client — it's part of the job, not an extra.
Your Tax-Base Transfer Assessment
Tell me about your current home and where you're headed, and I'll send you a written estimate:
- Your current taxable value and what transfers
- Your estimated new property-tax bill — with and without Prop 19
- The dollar savings per year, and over 10 years
- The timing plan that protects your eligibility
No cost, no obligation. Estimates, not tax advice — your CPA gets the final word.
Request the assessment
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Prop 19 is one piece. The whole move is the puzzle.
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