For many longtime North County San Diego homeowners, moving is not simply a question of what their home will sell for or what the next home will cost. There is another number that can make a major difference: their property-tax basis.
Proposition 19 allows qualifying California homeowners age 55 or older to transfer the factored base-year value of their current principal residence to a replacement principal residence anywhere in California. The benefit can be used up to three times, but it is not automatic. Eligibility depends on age, occupancy, timing, property values and filing the correct claim with the county assessor.
In coastal North County, where home values can be substantially higher than a longtime owner's assessed value, understanding these rules before selling can potentially save thousands of dollars per year. We have created a resource at www.DownSizeAlly.com for you.
Key takeaways
The claimant must be at least 55 years old when the original principal residence is sold. Qualifying severely and permanently disabled homeowners of any age may also be eligible under separate rules.
The original residence and replacement residence must qualify as principal residences, not vacation homes or rental properties.
The replacement residence must be purchased or newly constructed within two years before or after the original residence is sold.
A replacement residence may be located anywhere in California.
Qualifying age- or disability-based homeowners may use the Proposition 19 transfer up to three times.
The value test generally allows a replacement worth up to 100% of the original home's value when purchased before the sale, 105% when purchased during the first year after the sale, and 110% when purchased during the second year after the sale.
Buying a more expensive home does not automatically eliminate the benefit. The value above the applicable limit is generally added to the transferred taxable value.
The benefit must be claimed. Homeowners qualifying based on age file form BOE-19-B with the assessor in the county where the replacement residence is located.
How does Proposition 19 help homeowners who want to move or downsize?
Under Proposition 13, a California property's taxable value is generally based on its value when acquired, with annual inflation adjustments limited to no more than 2%, plus reassessments for qualifying new construction or later changes in ownership.
That means a homeowner who purchased decades ago may have a taxable value far below the home's current market value. Without Proposition 19, purchasing another home would ordinarily establish a new taxable value based on the replacement property's current market value.
Proposition 19 can allow an eligible homeowner to transfer the original residence's factored base-year value—often called its taxable value—to the replacement residence. Depending on the values involved, that transfer can substantially reduce the taxable value of the new home compared with a complete reassessment at current market value.
This does not necessarily preserve the homeowner's exact tax bill. Tax rates, special assessments, parcel taxes, Mello-Roos and voter-approved charges can differ from one property to another. Proposition 19 transfers the qualifying taxable value, not every charge appearing on the tax bill.
Who qualifies for an age-55 transfer?
For an age-based transfer, the claimant must be at least 55 on the date the original principal residence is sold. The homeowner may have been younger than 55 when the replacement residence was purchased, provided the original home is later sold within the required two-year period and the homeowner is at least 55 on the sale date.
The original residence must be owned and occupied as the claimant's principal residence and must be eligible for the Homeowners' Exemption or Disabled Veterans' Exemption. The claimant must also own and occupy the replacement residence as a principal residence when filing the transfer claim.
There is no required minimum number of years that the homeowner must have lived in the original residence. The important issue is whether the property satisfies the ownership and principal-residence requirements.
The California State Board of Equalization's Proposition 19 guidance provides the statewide rules, while the assessor in the replacement property's county reviews the claim and determines the applicable property values.
What changed from the previous property-tax transfer rules?
Before Proposition 19, most qualifying homeowners could transfer their taxable value only once. Intercounty moves were also limited to counties that had adopted reciprocal ordinances.
Proposition 19 removed those geographic restrictions for qualifying transfers beginning April 1, 2021. An eligible homeowner can now move from Encinitas to Palm Springs, Carlsbad to Sacramento, or one San Diego County community to another and apply to carry the qualifying taxable value to the replacement principal residence.
The law also permits up to three age- or disability-based transfers. According to the State Board of Equalization, previous transfers under Propositions 60, 90 or 110 do not use up the three transfers available under Proposition 19.
How do the 100%, 105% and 110% value thresholds work?
The timing of the replacement purchase affects how the assessor determines whether the replacement residence is of equal or lesser value.
Replacement purchased before the original residence is sold: The replacement residence may be worth up to 100% of the original residence's full cash value for the taxable value to transfer without an added value adjustment.
Replacement purchased during the first year after the sale: The replacement may be worth up to 105% of the original residence's full cash value.
Replacement purchased during the second year after the sale: The replacement may be worth up to 110% of the original residence's full cash value.
These comparisons are based on the properties' full cash values as determined by the assessor—not automatically on their contract prices. In a typical arm's-length transaction, the sale and purchase prices may provide strong evidence of market value, but the assessor makes the final determination.
If the replacement residence exceeds the applicable value threshold, the homeowner may still receive a partial benefit. The excess value is generally added to the original residence's transferred factored base-year value.
A simple example
Assume the original residence has:
A factored base-year value of $500,000
A full cash value at sale of $2,000,000
If the homeowner purchases the replacement residence during the first year after the sale, the equal-or-lesser-value limit is:
$2,000,000 × 105% = $2,100,000
If the replacement residence has a full cash value of $2,300,000, the amount above the threshold is:
$2,300,000 − $2,100,000 = $200,000
The replacement residence's estimated transferred taxable value would therefore be:
$500,000 + $200,000 = $700,000
That is still substantially below a full reassessment at $2,300,000. This example is for illustration only; the county assessor determines the actual values and eligibility.
North County coastal market context
Recent local market data shows why Proposition 19 planning can be especially important for longtime coastal homeowners.
North County area median sale prices—trailing approximately 90 days, September 2026
| Area | Median sale price | Median days on market |
|---|---|---|
| Encinitas | $2,223,750 | 47 |
| Carlsbad | $1,450,000 | 33 |
| Solana Beach | $2,200,000 | 43 |
| Del Mar | $3,900,000 | 47 |
These are area-level medians from recent local market data. They are useful for understanding the broader market, but they do not establish the value of an individual property. A home's actual value depends on its location, condition, lot, improvements, view, property type and the market at the time of sale.
What is the two-year timing requirement?
The replacement residence must be purchased or newly constructed within two years before or after the sale of the original residence. Either the sale of the original residence or the purchase or completion of the replacement residence must occur on or after April 1, 2021.
Homeowners can buy first or sell first, but the order affects both the applicable value threshold and the timing of the tax benefit.
If you buy before selling
Buying first uses the 100% equal-or-lesser-value test. It may give the homeowner more time to move, prepare the original home for sale and avoid making the purchase contingent on a sale.
However, the Proposition 19 transfer does not become effective until the later qualifying event. If the replacement residence is purchased first, the homeowner will generally owe property taxes based on its full assessed market value until the original residence sells. The State Board of Equalization states that there is no refund for that interim period.
If you sell before buying
Selling first allows a replacement residence purchased during the first year to qualify under the 105% test. A replacement purchased during the second year may qualify under the 110% test.
The broader percentage does not extend the overall deadline: the replacement must still be purchased or completed within two years of the original home's sale.
This is why Proposition 19 planning should happen before the original home is listed. Closing dates, temporary housing, financing and the anticipated value of the replacement home can all affect the best sequence.
How do you claim the transfer in San Diego County?
The transfer is not automatic and is not completed through escrow. The claim is filed after both transactions are complete and the homeowner occupies the replacement residence.
Homeowners qualifying based on age use form BOE-19-B, Claim for Transfer of Base Year Value to Replacement Primary Residence for Persons at Least Age 55 Years.
The claim must be filed with the assessor in the county where the replacement residence is located. For a replacement residence in North County San Diego, that is the San Diego County Assessor/Recorder/County Clerk.
Qualifying severely and permanently disabled homeowners use BOE-19-D and BOE-19-DC. A move to a single-story or otherwise more accessible property does not by itself establish disability eligibility. The claimant must meet California's severely-and-permanently-disabled standard and provide the required physician certification.
What is the filing deadline?
To receive relief retroactive to the transfer's effective date, the claim should generally be filed within three years of the purchase or completion of new construction of the replacement residence.
A homeowner who misses the three-year period may still qualify, but the benefit generally begins with the year in which the claim is filed rather than being applied retroactively to the original transfer date. Filing promptly can prevent unnecessary delays, supplemental bills and lost retroactive relief.
The BOE publishes the current forms and filing requirements on its Proposition 19 page.
What transfers—and what does not?
The transferred amount is the qualifying factored base-year value of the original residence. This is the property's taxable value after permitted annual inflation adjustments and any applicable reassessments—not necessarily the amount originally paid for the home.
A temporary Proposition 8 decline-in-value assessment is not the same as a factored base-year value. Historic-property assessments under a Mills Act contract also require special analysis. Homeowners in either situation should ask the assessor to identify the taxable value eligible for transfer before relying on an estimate.
Even when the taxable value transfers without adjustment, the total property-tax bill may change because the replacement residence may have different:
Special assessments
Parcel taxes
Mello-Roos obligations
School or infrastructure bonds
Local voter-approved charges
The transferred taxable value is powerful, but it does not freeze every component of the tax bill.
Frequently asked questions
If I am over 55, can I keep my current property-tax bill when I buy a smaller home?
You may be able to transfer your current factored base-year value, but Proposition 19 does not transfer or guarantee the exact tax bill. If the replacement residence satisfies the applicable value test, the original home's taxable value can generally transfer without an added value adjustment. Local tax rates and assessments may still cause the new bill to differ.
What does “equal or lesser value” mean if I sell in Carlsbad and buy a condo in Oceanside?
The assessor compares the full cash value of the replacement residence with the original residence's full cash value at the time of sale. If the replacement is purchased before the Carlsbad home sells, the applicable limit is generally 100%. If purchased during the first year after the sale, it is 105%; during the second year, it is 110%.
The assessor determines the official values. The contract prices may be important evidence, but they do not replace the assessor's valuation.
Can I use Proposition 19 more than once?
Yes. Qualifying homeowners age 55 or older—and qualifying severely and permanently disabled homeowners—may use the Proposition 19 transfer up to three times. A previous transfer under Proposition 60, 90 or 110 does not reduce the three transfers available under Proposition 19.
Do I have to buy before I sell?
No. The replacement residence can be purchased or newly constructed within two years before or after the original residence is sold. Buying first uses the 100% value threshold and may create an interim period during which the replacement is taxed at its full assessed market value. Buying during the first year after selling uses the 105% threshold; buying during the second year uses the 110% threshold.
What happens if the replacement home is more expensive?
You may still receive meaningful tax relief. If the replacement residence exceeds the applicable value threshold, the excess is generally added to the transferred factored base-year value. The result may still be far lower than a complete reassessment at the replacement home's current market value.
What form should I file?
Homeowners qualifying based on age file BOE-19-B with the assessor in the county where the replacement residence is located. Qualifying disabled homeowners file BOE-19-D and BOE-19-DC. The claim is filed after the sale and purchase are complete and the claimant occupies the replacement residence.
Does Proposition 19 also affect homes transferred to children or grandchildren?
Yes, but that is a different part of Proposition 19 with separate eligibility, occupancy, value and filing rules. A homeowner considering both a move and an eventual family transfer should consult the county assessor and a qualified property-tax or estate-planning professional before making either transfer.
The bottom line for North County homeowners
Proposition 19 can remove one of the biggest financial obstacles facing longtime California homeowners who want to downsize, move closer to family or purchase a home that better fits their current lifestyle.
But the benefit depends on details: the owner's age on the sale date, principal-residence eligibility, the two-year window, the assessor's values, the order of the transactions and timely filing. Those details should be mapped out before the original residence goes on the market—not after both escrows have closed.
If you are considering a move in Encinitas, Carlsbad, Solana Beach, Del Mar or elsewhere in North County San Diego, I can help you evaluate the real estate side of the decision, estimate different sale-and-purchase scenarios and coordinate the timing with your tax and legal professionals.
Contact me to schedule a no-obligation consultation and build a move strategy around your goals.
You can also read what past clients have said about working with me on Google.
For more guidance, see After Accepting an Offer: North County San Diego Escrow and How to Price a North County Home Right in 2026.
About Loren Sanders
Loren Sanders is a Compass broker associate serving North County San Diego's coastal communities. With 35 years of real estate experience, he helps buyers and sellers navigate important decisions with clear communication, local market knowledge and a practical, data-informed approach.
Loren Sanders | Compass
California DRE #01139038
760-583-7100
Equal Housing Opportunity
This article provides general information and does not constitute legal, tax or financial advice. Proposition 19 eligibility and taxable values are determined by the applicable county assessor. Consult the county assessor and a qualified property-tax attorney, CPA or other tax professional regarding your specific circumstances.
