Editorial note: Gold California is not a tax advisor, a licensed attorney, or a county assessor. This page is a plain-English explainer of a California property tax rule for readers age 55 and older. Every figure and rule is cited to the California Board of Equalization or the Revenue and Taxation Code. Consult a licensed California CPA, attorney, or your county assessor for your specific situation.
Last updated: August 15, 2026 · By Gold California Editorial
Quick answer: Proposition 19 lets California homeowners age 55 or older transfer the base year value of a principal residence to a replacement principal residence up to three times over a lifetime. The replacement must be bought or newly built within two years of the sale of the original home. The transfer works statewide since April 1, 2021. If the replacement is worth more than the original, the excess is added to the transferred base year value.
Short on time? The essentials
- Proposition 19 was approved by California voters on November 3, 2020, and the base year value transfer provisions became operative on April 1, 2021.
- Three categories qualify under the same rule: homeowners at least age 55, severely and permanently disabled homeowners, and victims of a Governor-proclaimed wildfire or natural disaster.
- The transfer applies to a principal residence sold and a principal residence purchased or newly constructed, not to rentals or second homes.
- The replacement must be bought or newly built within two years of the sale of the original home (sale before purchase, or purchase before sale).
- The transfer is statewide: any California county to any California county, replacing the county-by-county rules under prior Propositions 60, 90, and 110.
- An age-55-and-older claimant can use the transfer up to three times in a lifetime, regardless of prior use under Propositions 60, 90, or 110.
- If the replacement is of equal or lesser value than the original, the factored base year value carries over with no adjustment.
- If the replacement is worth more than the timing-adjusted original value, the excess is added to the transferred base year value.
- The claim is filed on Form BOE-19-B with the county assessor of the replacement home, within three years of purchase or completion.
- The statutory authority is California Revenue and Taxation Code section 69.6, implementing Article XIII A, section 2.1 of the California Constitution.
This page is for California homeowners age 55 and older, surviving spouses, adult children helping a parent, and executors weighing what Proposition 19 does to the property tax base when a family home sells. Below we cover the qualifying rules, the value math, the three-use lifetime cap, and the county-assessor filing that turns a claim into a transferred base year value.
Every figure and every rule below is cited to the California Board of Equalization or to the Revenue and Taxation Code. This is not tax advice; consult a licensed California CPA, attorney, or your county assessor for your specific situation.
What is a Prop 19 base year value transfer?
A base year value transfer moves the assessed value of an original principal residence over to a replacement principal residence, so the property tax is calculated on the older, lower value instead of the replacement's purchase price. That is the whole point of the rule.
Under Proposition 13, a property's overall local tax rate is capped at 1 percent of assessed value, and the assessed value grows by 2 percent or inflation each year, whichever is lower. Selling and rebuying normally resets that base to the new purchase price. Prop 19 lets three groups of homeowners keep the old base under specific conditions (source: California Board of Equalization, Proposition 19).
The statutory authority is Revenue and Taxation Code section 69.6, which implements Article XIII A, section 2.1 of the California Constitution. Section 69.6 replaced two older provisions for people at least age 55, severely disabled homeowners, and disaster victims: sections 69.5 (Props 60/90/110) and 69/69.3 for certain disaster relief (same BOE page).
The base year value transfer provisions of Proposition 19 became operative on April 1, 2021 (source: BOE Letter to Assessors No. 2020/061, Proposition 19, December 2020).
Who qualifies under Prop 19 section 69.6
Three categories of California homeowners can use the base year value transfer. They are treated under the same section 69.6, and a homeowner only needs to fit one of the three:
- Age 55 or older. The claimant must be at least age 55 on the date of sale of the original home. If a couple owns the home together, only one spouse needs to meet the age test.
- Severely and permanently disabled. The claimant must be severely and permanently disabled at the time of sale, as certified on the claim form.
- Wildfire or natural disaster victim. The original home must be substantially damaged or destroyed by a wildfire, as declared by the Governor of California, or by another Governor-proclaimed disaster.
To qualify, the claimant does not need to be all three categories at once. The BOE states plainly that "a homeowner may qualify for the base year value transfer under any one of the three categories listed" (source: BOE, Proposition 19 FAQs). This page focuses on the age-55-or-older path.
What "principal residence" means
Both the original home and the replacement home must be a principal residence, not a rental, a second home, or a commercial property. The BOE states that "eligible for" the transfer means "the homeowner must own and occupy the home as a principal residence" (same BOE page).
The homeowner must have owned the original home and used it as a principal residence either at the time of sale, or within two years of buying the replacement (same source). Ownership on paper alone does not qualify; the home must have been lived in as a primary residence.
Proof of principal-residence status is usually the homeowners' exemption on the property tax bill, or the disabled veterans' exemption. Filing that exemption on the replacement home, within one year of the transfer, is part of what protects the claim.
The two-year window between sale and purchase
The two homes must be tied together in time. The replacement principal residence must be purchased or newly constructed within two years of the sale of the original home. The window works in both directions.
The BOE confirms the point directly. At least one of the two transactions must occur on or after April 1, 2021. The original home must then be sold within two years of the purchase of the replacement home for the base year value to transfer under Proposition 19 (source: BOE, Proposition 19 FAQs).
Practically, you can sell first and then buy within two years, or buy first and then sell within two years. Either sequence is allowed, and the two-year clock is not extendable by the BOE. The operative dates come from the California Constitution (same BOE page).
The equal-or-lesser-value test at 100, 105, and 110 percent
The comparison that decides whether the base carries over unchanged is between the full cash value of the replacement home and an "adjusted full cash value" of the original home. The adjustment depends on when the replacement was bought or built:
- 100 percent of the original's full cash value if the replacement was purchased or newly constructed before the sale of the original home.
- 105 percent if the replacement was purchased or newly constructed within the first year after the sale of the original home.
- 110 percent if the replacement was purchased or newly constructed within the second year after the sale of the original home.
If the replacement's full cash value is equal to or less than that adjusted figure, the factored base year value carries over with no adjustment. If the replacement is worth more, the difference is added to the factored base year value (source: BOE, Proposition 19 FAQs).
The BOE gives the following worked example. An original home has a full cash value of $400,000 and a factored base year value of $100,000 at time of sale. The replacement is purchased within one year after the sale. The adjusted full cash value equals $400,000 times 105 percent, which is $420,000.
If the replacement's full cash value is $600,000, the difference is $600,000 minus $420,000, which equals $180,000. That $180,000 is added to the factored base year value of $100,000. The new base year value on the replacement is $280,000 (same BOE FAQ).
The three-uses lifetime cap
Proposition 19 raised the number of allowed base year value transfers from one under prior Props 60, 90, and 110 to three under section 69.6. The cap is a hard limit on the age-55-or-older and disabled categories; disaster claims are counted separately by many assessors.
The BOE addresses the interaction with prior use directly. Under Proposition 19, three transfers are allowed for homeowners over age 55 or physically and permanently disabled. That allowance stands even if a property owner previously transferred a base year value under Propositions 60/90 or 110 (source: BOE, Proposition 19 FAQs).
In plain terms, a prior single use of Prop 60/90/110 does not eat into your three Prop 19 uses. But the three Prop 19 transfers are total, not per property or per county. Track how many you have used, because assessors keep a claim history for each claimant.
A spouse pair is treated as one claimant unit. If either spouse used a prior transfer, that use is attributed to the couple. See BOE Letter to Assessors No. 2022/009, Implementation of Proposition 19: Base Year Value Transfers for the assessor-level guidance.
Statewide since April 1, 2021: what changed from Props 60, 90, and 110
The most reader-facing change is geography. Under the prior Props 60 and 90, a base year value transfer was intracounty by default, and intercounty only if the receiving county had chosen to accept transfers by ordinance. In practice, only a short and shifting list of counties accepted them.
Prop 19 removed that limit. Since April 1, 2021, the transfer is statewide: any California county to any California county. The BOE places the operative date squarely: "the base year value transfer provisions became operative on April 1, 2021" (same source).
The prior Props 60 and 90 rules under Revenue and Taxation Code section 69.5 still apply to transfers with a sale on or before March 31, 2021 (source: California Legislative Information, Revenue and Taxation Code section 69.5). Section 69.5 is the legacy statute; section 69.6 is the current Prop 19 statute.
The equal-or-lesser-value math also changed. Under the old Props 60 and 90, the replacement had to be of equal or lesser value than the original at the time of sale (100 percent), with narrow timing adjustments in a few counties. Under Prop 19, the 100 percent, 105 percent, and 110 percent windows are set in the state Constitution and apply uniformly across California.
Prop 19 base transfer vs Prop 19 parent-child exclusion
Proposition 19 changed two different property tax rules on the same ballot. Do not confuse them. This page covers the base year value transfer for age-55-or-older homeowners under section 69.6. The parent-child exclusion is a separate provision in section 63.2, addressing what happens when a parent gifts or bequeaths a home to a child.
The parent-child exclusion became operative on February 16, 2021. It now applies only to the transferor's principal residence, and only if the transferee makes the home the transferee's principal residence within one year. The value cap is the factored base year value plus $1,000,000, indexed (source: BOE, Proposition 19). Everything above that cap is added to the transferred base year value.
The base year value transfer for age 55 and older, which this page covers, has no $1,000,000 cap. The math above the equal-or-lesser-value threshold is a straight dollar-for-dollar add of the excess. The two provisions share Prop 19 as a parent, but the machinery is different.
How to file Form BOE-19-B with the county assessor
The claim for an age-55-or-older base year value transfer is filed with the county assessor of the replacement home. The form is BOE-19-B, "Claim for Transfer of Base Year Value to Replacement Primary Residence for Persons at Least Age 55 Years" (source: BOE-19-B sample form, revised 2024).
Steps below reflect the standard filing path. Every county assessor has a version of the same form on its website, sometimes with local claim-status instructions layered on top.
- Confirm the original home's factored base year value. Pull the last property tax bill for the original home. The assessed value line is the factored base year value that would transfer.
- Confirm the sale date of the original home and the purchase or completion date of the replacement. The two dates together set the 100, 105, or 110 percent adjustment factor.
- Compute the adjusted full cash value of the original. Multiply the original's full cash value at time of sale by 100 percent, 105 percent, or 110 percent, based on timing.
- Compare to the replacement's full cash value. If less than or equal, the factored base year value carries over. If greater, the excess is added to the transferred base.
- Download Form BOE-19-B from the county assessor of the replacement home. Every county publishes the form; a few counties add a supplemental sheet.
- File the claim within three years of the replacement's purchase or completion. The three-year window is set in section 69.6; late filings receive prospective relief only.
- File the homeowners' exemption on the replacement within one year of transfer. The exemption is proof of principal-residence status and protects the claim.
Base year value across sale-and-replacement scenarios
The table shows how the new base year value moves under the BOE-worked framework. It uses the same original-home numbers ($400,000 full cash value, $100,000 factored base year value) and varies only the replacement price and timing.
| Scenario | Adjusted full cash value of original | Replacement full cash value | Excess added | New base year value on replacement |
|---|---|---|---|---|
| Bought before sale (100 percent) | $400,000 x 100% = $400,000 | $400,000 | $0 | $100,000 |
| Bought before sale (100 percent), replacement more expensive | $400,000 x 100% = $400,000 | $600,000 | $200,000 | $300,000 |
| Bought within year 1 of sale (105 percent) | $400,000 x 105% = $420,000 | $420,000 | $0 | $100,000 |
| Bought within year 1 of sale (105 percent), replacement more expensive | $400,000 x 105% = $420,000 | $600,000 | $180,000 | $280,000 |
| Bought within year 2 of sale (110 percent) | $400,000 x 110% = $440,000 | $440,000 | $0 | $100,000 |
| Bought within year 2 of sale (110 percent), replacement more expensive | $400,000 x 110% = $440,000 | $600,000 | $160,000 | $260,000 |
Sources: California Board of Equalization, Proposition 19 FAQs and worked example; BOE Letter to Assessors No. 2022/009. Checked August 2026.
When a Prop 19 transfer is a bad idea
A balanced page names when this rule works against you, or when using it would waste one of your three transfers. Several situations argue for slowing down.
- The original home was never your principal residence. Rentals, second homes, and vacation properties do not qualify for section 69.6. Filing anyway wastes assessor time and creates a paper trail you may have to correct later.
- The replacement is much more expensive than the original. If the excess over the adjusted threshold is large, most of the replacement is reassessed at market anyway, and the transferred base may not save enough tax to be worth using a lifetime slot.
- You may need to move again within a few years. Each move uses one of your three transfers. If a downsizing move is likely to be followed by another move (for care, family, or a smaller home), keep at least one slot in reserve.
- You are planning to leave California. The transfer is statewide, but only inside California. A move to another state does not carry a base year value with it.
- You are counting on the parent-child exclusion. That is a different rule (section 63.2) with its own conditions, a $1,000,000 factored-base add-on, and a one-year principal-residence-use test on the transferee. Do not conflate them.
- You have used all three transfers. Section 69.6 caps at three lifetime uses for the age-55-or-older category. A fourth attempt will be denied by the county assessor.
If one of these describes you, wait, get advice from a licensed California CPA or attorney, and revisit later. The Prop 19 base transfer rewards planning; it does not reward rushing.
Prop 19 base transfer questions, answered
Does Prop 19 let me keep my old property tax bill?
Not the whole bill, but the base year value that drives it. Your local voter-approved debt, parcels, and special assessments still apply on the replacement home. What transfers is the factored base year value under Proposition 13, which sets the assessed value that the 1 percent cap runs against.
Can I use the Prop 19 base transfer if I already used a Prop 60 or Prop 90 transfer before 2021?
Yes. Under section 69.6, three transfers are allowed for homeowners at least age 55, regardless of whether the claimant previously used a transfer under Proposition 60, Proposition 90, or Proposition 110. The BOE addresses this point in its Prop 19 FAQs and confirms three Prop 19 slots remain available.
Does the Prop 19 transfer work if my replacement home is more expensive than my original home?
Yes, with an upward adjustment. If the replacement's full cash value exceeds the adjusted full cash value of the original (100 percent, 105 percent, or 110 percent based on timing), the excess is added to the transferred factored base year value. The new base equals the original factored base plus that excess.
Do I have to buy the replacement in the same county?
No. Since April 1, 2021, Prop 19 base year value transfers work anywhere in California, in any county. The prior county-by-county rules under Props 60 and 90 no longer apply to sales on or after April 1, 2021. The replacement county assessor administers the claim under section 69.6.
What form do I file, and how long do I have?
Form BOE-19-B, "Claim for Transfer of Base Year Value to Replacement Primary Residence for Persons at Least Age 55 Years." File it with the county assessor of the replacement home within three years of the replacement's purchase or completion date. Late filings receive prospective relief only, starting the lien date of the year the claim is filed.
Can only one spouse be at least age 55 for the transfer to work?
Yes. Only one spouse of a co-owner couple needs to meet the age-55-or-older test on the date of sale of the original home. The BOE confirms this in its Prop 19 FAQs. That single-spouse rule is a common facts and circumstances question, and the assessor form asks for the qualifying spouse's date of birth.
Is the two-year window between sale and purchase extendable?
No. The two-year window is set in the California Constitution and cannot be extended by the Board of Equalization or the county assessor. The BOE states plainly that the BOE does not have the authority to extend or change Proposition 19's operative dates. Plan your closing dates around the window.
Does a Prop 19 base transfer help with California state income tax?
No. Proposition 19 changes the local property tax base year value on a replacement home. It has no effect on California state income tax, on federal income tax, on Section 121 capital-gains treatment of the sale itself, or on any retirement-account rules. Those are separate systems; consult your tax advisor for your specific situation.
Sources
- California Board of Equalization, Proposition 19 (main page and FAQs). Checked August 2026.
- California Board of Equalization, Letter to Assessors No. 2020/061, Proposition 19 (December 2020). Checked August 2026.
- California Board of Equalization, Letter to Assessors No. 2021/019, Proposition 19 Base Year Value Transfer Guidance Questions and Answers. Checked August 2026.
- California Board of Equalization, Letter to Assessors No. 2022/009, Implementation of Proposition 19: Base Year Value Transfers. Checked August 2026.
- California Board of Equalization, Sample Form BOE-19-B, Claim for Transfer of Base Year Value to Replacement Primary Residence for Persons at Least Age 55 Years. Checked August 2026.
- California Legislative Information, Revenue and Taxation Code section 69.6 (Proposition 19 base year value transfer statute). Checked August 2026.
- California Legislative Information, Revenue and Taxation Code section 69.5 (legacy Propositions 60, 90, and 110 statute). Checked August 2026.
