02 What you need to know
How a Prop 19 base year value transfer works
Under Proposition 19, base year value transfers became available on April 1, 2021. A qualifying homeowner can transfer the taxable value of their primary residence to a replacement primary residence anywhere in California.
Taxable value here means your factored base year value: the value set when you bought, plus the yearly inflation adjustments capped at 2%. For a long-time owner, it’s often far below market value.
Who may qualify
- Homeowners 55 or older on the date the original home is sold. If you’re married, generally only one spouse needs to meet the age requirement.
- Homeowners who are severely and permanently disabled.
- Owners whose home was damaged by a wildfire or natural disaster, as defined. Separate rules apply to this group.
For those 55 and older or severely disabled, the transfer can be used up to three times.
Key requirements
- Both homes must be your principal residence, eligible for the homeowners’ or disabled veterans’ exemption. Vacation homes and rentals don’t count.
- The replacement must be purchased or newly built within two years of selling the original, before or after.
- You file the claim with the assessor in the county of the replacement home. For the 55+ transfer, that’s Form BOE-19-B. BOE guidance says to file within three years of buying or completing the replacement home.
The value test
The transfer is cleanest when the replacement costs the same or less than what the original sold for, using these limits:
- 100% of the original’s value if you buy the replacement before selling.
- 105% if you buy in the first year after selling.
- 110% if you buy in the second year after selling.
If the replacement costs more, you can still transfer. The amount above that adjusted limit is added to your transferred value.
Prop 19 also changed parent-to-child transfers, which now generally require the child to live in the home. That’s a separate set of rules.
03 Real-world example
Prop 19 example: downsizing vs. buying up
You sell your LA home for $1,200,000. Your factored base year value is $300,000. You’re over 55, and both homes will be your primary residence.
Case A: buy a $1,000,000 condo
The condo costs less than the original sold for, so the $300,000 value transfers as is.
Case B: buy a $1,500,000 home within a year of selling
The 105% limit is $1,260,000. The replacement is $240,000 over it, so the new taxable value is $300,000 + $240,000 = $540,000.
| Scenario | Taxable value | Tax at illustrative 1.2% |
|---|---|---|
| Case A, with transfer | $300,000 | $3,600 |
| Case A, reassessed at $1,000,000 | $1,000,000 | $12,000 |
| Case B, with transfer | $540,000 | $6,480 |
| Case B, reassessed at $1,500,000 | $1,500,000 | $18,000 |
Assumptions: 1.2% is an illustrative total rate; actual rates vary by tax rate area. Excludes direct assessments, Mello-Roos and exemptions. Assumes the claim is approved. The assessor sets the actual values.
04 What most people overlook
What homeowners overlook about Prop 19
- Timing changes the math. Buying in year two gives you a 110% limit; buying before you sell gives you only 100%.
- The two-year clock runs from the sale of the original home. Missing it can mean a full reassessment.
- Market value isn’t always the price. The assessor compares full cash values. Unusual sales terms can change the comparison.
- Filing is on you. The transfer isn’t automatic. File BOE-19-B with the assessor where the replacement home is.
- Qualifying for the loan is separate. Retirees with strong savings but little paycheck income may qualify using assets. See asset depletion mortgages.
Prop 19 can make a move far more affordable, but the result depends on timing, values and an approved claim. Confirm with the LA County Assessor before you commit.
05 How I’d approach it
How I’d plan a move using Prop 19
If taxes are the reason you haven’t moved, let’s put real numbers on it before you decide you’re stuck.
I start with your current factored base value from your tax bill and a realistic sale price. Then I map which purchase window gives you the most room.
- Decide whether to buy before or after you sell, since it changes both the value limit and your financing.
- Estimate the replacement home’s taxable value and tax at different prices. Compare with a full reassessment.
- Run the payment in the mortgage payment calculator.
- Have you confirm eligibility and filing details with the LA County Assessor.
I’m a loan advisor, not a tax advisor, so I’ll also suggest you check the plan with your CPA.