Thinking about selling your Santa Monica home but worried about losing your low property tax? If you are 55 or older or severely and permanently disabled, California’s Proposition 19 can help you move and keep a lower assessed value. In this guide, you’ll learn who qualifies, how the transfer works, the timing rules, and the exact steps to file in Los Angeles County. You’ll also see simple number examples to make the math clear. Let’s dive in.
Prop 19 at a glance
- Eligibility: You qualify if you are at least 55 or are severely and permanently disabled, and you are selling your principal residence and buying another principal residence in California. The BOE’s Prop 19 overview explains the rules.
- Anywhere in California: Your replacement home can be in any county.
- Up to three transfers: Each spouse or registered domestic partner can use up to three transfers.
- Two-year window: Buy or newly construct the replacement within two years of the sale.
- You must file a claim: The transfer is not automatic. You file with the county where the replacement home is located after you own and occupy it as your principal residence.
How the tax transfer works
Prop 19 lets you move your factored base year value, which is the lower assessed value that keeps your property taxes down. If your replacement home is more expensive than your Santa Monica home, you keep your low base and only pay taxes on the extra value above the allowed threshold. The BOE details the calculation method and timing rules in its Letter to Assessors No. 2022/009.
Simple example: Upsizing
- Original Santa Monica home: market value 2,000,000; assessed value (factored base) 600,000.
- Replacement home: market value 2,500,000.
- Difference in value: 500,000. Add that to the transferred base of 600,000. New assessed value becomes 1,100,000. You keep the benefit of the 600,000 base and pay normal tax rates on the 500,000 difference.
Simple example: Downsizing
- Original Santa Monica home: market value 2,000,000; assessed value 600,000.
- Replacement home: market value 1,800,000.
- If the replacement meets the equal or lesser value test for your timing, the 600,000 base transfers with no upward adjustment. If a new assessment without transferring would be lower than 600,000, you may choose not to file, since claiming the transfer is optional. Run the numbers before you decide.
Quick 3-step checklist
- Confirm eligibility: Age 55+ or severely and permanently disabled, and both homes are principal residences. Review BOE’s Prop 19 guidance for details.
- Align timing: Buy or build the replacement within two years of selling the Santa Monica home.
- File your claim: After you own and occupy the replacement, file the appropriate BOE form (BOE‑19‑B for 55+, BOE‑19‑D plus BOE‑19‑DC for disability) with the county assessor where the replacement is located. File within three years of purchase or construction completion.
Key timing rules and pitfalls
- Two-year buy/sell window: The purchase or construction of the replacement must occur within two years of the sale of your original home.
- File within three years: File the base year value transfer claim within three years of replacement purchase or construction completion.
- Occupy before filing: You must own and occupy the replacement as your principal residence when you file.
- Escrow does not handle it: This is a separate county assessor claim, not an escrow item.
- Buying before selling: Expect to pay taxes on the replacement’s full assessed value until the sale occurs, then the county may issue an adjustment or refund after processing. See the BOE’s calculation and timing guidance.
Smart strategies for Santa Monica sellers
Strategy 1: Preserve your low base
If your Santa Monica assessed value is far below today’s market value and you are buying another California home, transferring your base can significantly reduce ongoing property taxes compared to a fresh assessment. Statewide eligibility and up to three transfers provide flexibility.
Strategy 2: Run the numbers before you claim
If your replacement would be assessed lower than your transferred base, claiming the transfer could raise your tax bill. Since filing is optional, compare both outcomes first.
Strategy 3: Coordinate the dates
The equal or lesser value test depends on timing bands. If possible, align your purchase and sale to fit favorable thresholds. Balance this with the reality that buying first may trigger a temporary higher tax bill until the sale closes.
Strategy 4: Plan as a couple
Each spouse or registered domestic partner has up to three transfers. In multi-move plans, sequence who claims and when to preserve flexibility.
Strategy 5: Be careful with inherited homes
Prop 19 narrowed parent-to-child exclusions. If you inherit and plan to occupy and later use portability, confirm the filing steps and limits first. Complex cases often need professional advice.
LA County filing steps for Santa Monica sellers
- Get the forms and instructions: File with the county where the replacement home is located. For local estimates and help, use the Los Angeles County Prop 19 calculator on the county portal: LA County Prop 19 calculator.
- Contact the Assessor: LA County Assessor general lines are (213) 974-2111 or 888-807-2111. Ask about local documentation, processing times, and any additional county requirements. The county’s general FAQ page is here: LA County Property Tax Portal.
- Gather documentation:
- Closing statements and recorded deed for your Santa Monica sale.
- Purchase contract and closing documents for the replacement home.
- Assessor parcel numbers (APN/AIN) for both properties.
- Proof of age or disability (BOE‑19‑DC for disability claims) and proof of occupancy.
- Keep records: Save copies of your filed claim and the county’s receipt. Processing can take time, and adjustments or refunds may follow later.
What to expect from the assessment
- The county determines “full cash value” and may adjust a sale price that does not reflect market value.
- If your replacement home costs more than your original, the difference above the equal or lesser threshold is added to your transferred base.
- If your replacement qualifies as equal or lesser for your timing, no upward adjustment applies.
Make your move with confidence
Prop 19 can help you right-size or relocate without giving up your low Santa Monica property tax base. A clear plan, careful timing, and complete documentation go a long way. For a tax-aware move strategy and discrete, concierge-level execution, connect with Lisa Bourque.
FAQs
Can I keep my low Santa Monica tax base when I move under Prop 19?
- Yes, if you are 55 or older or severely and permanently disabled, buy or build your replacement in California within two years, occupy it as your principal residence, and file a timely claim with the county assessor. See the BOE overview.
When should I file my Prop 19 claim after buying in LA County?
- File after you own and occupy the replacement residence, and within three years of the purchase or construction completion date; filing sooner helps avoid delays. Guidance is in BOE LTA 2022/009.
Will transferring ever increase my property taxes on the replacement home?
- It can. If a fresh assessment on the replacement would be lower than your transferred base, claiming the transfer could raise your taxes, so compare both outcomes before filing.
Does escrow handle Prop 19 paperwork for Santa Monica sellers?
- No. You must file the BOE claim form with the county assessor where the replacement property is located; escrow does not file it for you.
How many times can spouses use Prop 19 transfers?
- Each spouse or registered domestic partner can transfer a base year value up to three times, subject to eligibility and timing rules outlined by the BOE.
What happens if I buy my replacement before selling my Santa Monica home?
- You may pay taxes on the replacement’s full assessed value until the sale closes; the county can adjust after processing your claim, and a refund may follow if applicable, per BOE LTA 2022/009.
What documents do I need for a Prop 19 claim in LA County?
- Sale and purchase closing documents, recorded deeds, APN/AINs, proof of age or disability if applicable, and proof of occupancy; the LA County Assessor can confirm any additional items.
