Los Angeles County: How to Use Prop 19 to Move Your Property Tax Base or Inherit a Parent's Home (October 2026)

In Los Angeles County, the number on your property tax bill often has less to do with what your home is worth today than with when you bought it. Under Proposition 13, your assessed value is set when you buy, then rises each year by an inflation factor that can't be more than 2%. A family that bought decades ago may be paying taxes on a fraction of today's value. A buyer who closes this year pays on the full price.

That gap is why Proposition 19 matters so much here. Approved by California voters on November 3, 2020, Prop 19 lets certain homeowners carry their low tax base to a new home, and it sets the rules for when children and grandchildren can keep a parent's or grandparent's tax base after an inheritance or gift. It's especially relevant this year, as many Altadena, Pasadena, and Pacific Palisades families decide whether to rebuild or move after the January 2025 Eaton and Palisades fires.

This guide covers who qualifies, how to run the numbers, which forms to file with the Los Angeles County Assessor, and the timing mistakes that can cost thousands a year.

The Los Angeles County market right now

Realtor.com's September 2026 county data shows:

• Median listing price: $950,000, down 4.5% from September 2025.
• Median listing price per square foot: $620.
• Active listings: 15,374, up 4.1% from a year earlier.
• Median days on market: 56.
• Price-cut share (Realtor.com's price_reduced_share): 15.9% of listings had a price reduction.

The rate. Freddie Mac's 30-year fixed average (Primary Mortgage Market Survey) was 7.32% for the week of October 22, 2026, down from 7.40% the week before.

What a median-priced home costs a buyer. On the $950,000 median with 20% down ($190,000), the loan is $760,000. At 7.32% for 30 years:

Monthly payment = loan x r / (1 - (1 + r)^-360), where r = 0.0732 / 12

That works out to about $5,221 a month in principal and interest. Add the 1% base property tax on a full purchase price ($9,500 a year, about $792 a month), and you're at about $6,012 a month before local voter-approved charges, insurance, and HOA dues.

That property tax line is exactly what Prop 19 can shrink for an eligible homeowner.

Prop 19 in plain language

Prop 19 has two separate parts, and they work very differently.

Part 1: Base-year value transfers (in effect since April 1, 2021). A homeowner who is 55 or older, severely and permanently disabled, or whose home was substantially damaged or destroyed by a wildfire or natural disaster can sell their primary residence and move its "factored base year value" (the Prop 13 value plus the yearly inflation adjustments) to a replacement primary residence. According to the California State Board of Equalization (BOE):

• The replacement home can be anywhere in California. Before Prop 19, a move was limited to the same county or one of a handful of counties that opted in.
• The replacement can be any price. If it's worth more than the "equal or lesser value" limit, the extra value is added to the tax base you carry over.
• Homeowners 55+ or disabled can use it three times, even if they already used the older Prop 60/90 transfer. Under Revenue and Taxation Code section 69.6, the three-time limit does not apply to wildfire and disaster victims. The LA County Assessor describes the disaster rule as once per disaster.
• You must buy or build the replacement within two years of selling the original home (either order works).

Part 2: Parent-child and grandparent-grandchild transfers (in effect since February 16, 2021). Under the old Props 58 and 193, parents could pass down a home of any value, plus up to $1 million of other property such as rentals, without reassessment. Prop 19 narrowed this to:

• A family home that was the parent's (or grandparent's) principal residence and becomes the child's principal residence within one year, or a family farm.
• A value limit: the home's current factored base year value plus $1 million, adjusted every two years. The BOE lists the amount as $1,044,586 for transfers from February 16, 2025 through February 15, 2027.
• No exclusion for rentals, vacation homes, or other non-primary property. Those are reassessed to market value when they change hands.
• For grandchildren, the grandchild's parents who are the grandparents' children must be deceased on the date of transfer.

Step 1: Check whether you qualify

How to do it:

1. Pick your category. Under the BOE's guidance, you only need to meet one: age 55+, severely and permanently disabled, or wildfire/disaster victim. You must meet it on the date the original home is sold.
2. Confirm it's your principal residence. The original home must be eligible for the homeowners' or disabled veterans' exemption because you own it and live in it, either at the time of sale or within two years of buying the replacement. The BOE says there's no minimum number of years you must have lived there.
3. Confirm the replacement will be your principal residence. When you file, you must own and live in the replacement home. The BOE says a child can be on title with you. You don't have to be the sole owner of the replacement.
4. For disaster victims, check the damage test. Section 69.6 says a home is "substantially damaged or destroyed" if the land or the improvements suffered physical damage of more than 50% of their full cash value right before the disaster. The disaster must be a wildfire or a natural disaster proclaimed by the Governor.
5. Count your prior transfers. If you're claiming as 55+ or disabled, you can't have already been granted two Prop 19 transfers. Transfers under the old Prop 60/90 don't count against you.
6. For inheritances, check the date. The BOE says the date of death (or when a trust becomes irrevocable, typically at death) is the transfer date. On or after February 16, 2021, Prop 19 applies.

Step 2: Understand "equal or lesser value," and the upward adjustment

This is the rule that decides whether your tax base moves with you untouched or gets bumped up. The BOE defines "equal or lesser value" by when you buy the replacement:

If the replacement costs more than that limit, you still get the transfer. The amount over the limit is simply added to your carried-over tax base:

New taxable value = original factored base year value + (replacement value - limit)

The BOE's own example: an original home with a full cash value of $400,000 and a factored base year value of $100,000 is sold. The replacement is bought in the first year for $600,000. The limit is $420,000 (105% of $400,000), so $180,000 is added, and the new taxable value is $280,000.

For disaster victims, the comparison uses the original home's value immediately before the fire or disaster, not the lower value of a burned lot.

Step 3: Run the numbers on your own tax bill

The examples below use example values for illustration only. Your real numbers come from your tax bill, your sale price, and the Assessor's determination. For tax savings, we use roughly 1% as a stand-in for the base levy. Your actual bill is roughly 1% plus local voter-approved charges, which vary by tax rate area.

Example A: A 55+ downsizer (example values). You sell your longtime home for $1,500,000. Its factored base year value is $400,000. Within the first year, you buy a smaller home for $1,400,000.

Example B: Moving up in price (example values). Your original home sells at $950,000, the same as LA County's September median listing price, and its factored base year value is $300,000. You buy a $1,200,000 replacement. Watch how much the timing changes the result:

The more expensive replacement still saves thousands a year. Selling first and buying later gives you a higher limit, but you need somewhere to live in between.

Example C: Inheriting a parent's home (example values). A parent's home, which was the parent's principal residence, passes to a child in 2026. Its factored base year value is $250,000 and its market value is $1,500,000. The child moves in and files for the homeowners' exemption within a year.

If the same home were worth $1,200,000 instead, it would fall under the limit, and the child would keep the parent's $250,000 base unchanged.

Example D: A fire-destroyed home (example values). A home in a Governor-proclaimed wildfire area had a pre-fire value of $2,000,000 and a factored base year value of $600,000. The owner sells the damaged lot and, within the first year after the sale, buys a $2,300,000 home in another California county.

How to run your own numbers:

1. Find your current assessed (taxable) value on your tax bill or the LA County Assessor's property search.
2. Estimate the market value of the home you're selling and the price of the replacement.
3. Choose the right limit (100%, 105%, or 110%) based on your timing, or base + $1,044,586 for an inheritance.
4. Subtract the limit from the replacement value. If the result is positive, add it to your base.
5. Multiply the new taxable value by roughly 1%, then add the voter-approved charges from your current bill.
6. Try the LA County Assessor's estimators on its Prop 19 page, which take your Assessor Identification Number (AIN) and estimate the new base year value for both kinds of transfer.

Keep in mind that a tax base you carry over keeps rising each year by the inflation factor, which can't be more than 2%. For the 2026 roll, the BOE told assessors to use 1.02, the full 2%. A $400,000 base that rises the full 2% every year would be about $487,600 after 10 years.

Step 4: File the right forms with the LA County Assessor

You file Prop 19 claims with the Assessor of the county where the property is located. For a base-year transfer, that means the county of the replacement home. These forms are all listed on the LA County Assessor's forms page, and the deadlines come from the BOE's Prop 19 filing checklist:

How to do it:

1. Don't try to do it in escrow. The BOE says the base-year transfer claim is filed after both the sale and the purchase are complete and you're living in the replacement home. It is not handled through escrow.
2. For an inheritance, file the homeowners' exemption first. The BOE says that if the exemption is filed after the one-year period, the exclusion only applies going forward from then. The Assessor's office says the child or grandchild must live in the home and file the exemption within one year of the transfer.
3. Ask about other forms after a death. The LA County Assessor's forms page also lists BOE-502-D, Change in Ownership Statement, Death of Real Property Owner. Ask the Assessor or your attorney whether you need to file it.
4. Late filers still have options. Under section 69.6, a base-year claim filed after the three-year window can still be granted, but only from the lien date of the year you file. Earlier years are lost.
5. Contact the Assessor. Headquarters is at 500 W. Temple Street, Room 225, Los Angeles, CA 90012, (213) 974-3211 or toll free 1 (888) 807-2111. (The Sylmar office closed March 26, 2026.)

Step 5: Time the sale and purchase

The two-year window is the rule that trips people up most.

How to do it:

1. Map your dates before you list. Write down your expected closing date and the date two years later. The replacement must be bought or built by then.
2. Decide which order works for you. If you buy first, the BOE says you pay property tax on the replacement's full market value from the purchase date until you sell the original, with no refund for that period. Buying first also sets the limit at 100% of the original home's value.
3. If you sell first, plan your housing. Buying in year 1 or 2 after the sale raises your limit to 105% or 110%, but you'll need a rental or other place to live in between.
4. Use today's market. With 15.9% of LA County listings cutting price and a median 56 days on market, a buyer with a sale already closed has leverage. A lower purchase price can keep you under the limit and avoid an add-on.
5. Fire victims: know the sequence. The Assessor's disaster guide says Prop 19 requires selling the damaged property in its damaged condition. The two-year clock starts at that sale, not at the fire, so you can take time to decide. If you'd rather keep the lot, the Assessor explains that the older Prop 50 (buy within LA County within 5 years of the disaster) and Prop 171 (move to certain participating counties within 3 years) may apply instead, and neither requires a sale.

Step 6: Plan the inheritance before it happens

How to do it:

1. Have the family talk early. Decide which child, if any, will actually live in the home. Under Prop 19, the exclusion depends on a child making it their principal residence within a year. A home that will be rented out gets reassessed.
2. Understand that only one child needs to live there. The BOE says that if a home goes to two children, only one has to live there and file the exemption, as long as all other requirements are met.
3. Know what happens if the child moves out. The BOE says that once the home is no longer the child's principal residence, it gets a new taxable value as of the next lien date. That value is the market value on the inheritance date, adjusted for inflation since then.
4. Bring in a professional. Trusts, sibling buyouts, and estates with several properties can change the result. The BOE encourages consulting an attorney.

Mistakes to avoid

• Missing the two-year window. The Assessor's disaster guide says Prop 19 disaster relief isn't available if it's missed, and the same timing applies to 55+ and disability transfers.
• Assuming a rental or vacation home transfers. Only the family home (or family farm) qualifies.
• Missing the one-year homeowners' exemption deadline on an inherited home.
• Assuming the replacement must cost less. It can cost more. You just pay tax on the extra.
• Filing in the wrong county. Base-year claims go to the Assessor where the replacement home is.
• Keeping a homeowners' exemption you no longer qualify for. The BOE says December 10 is the last day to end it without penalty.

Your Prop 19 checklist

1. Category confirmed (55+, disabled, disaster, or inheritance), with the date you qualify
2. Current assessed value pulled from the tax bill or Assessor's property search
3. Sale date, two-year deadline, and three-year filing deadline on your calendar
4. Limit calculated (100% / 105% / 110%, or base + $1,044,586) and add-on estimated
5. LA County Assessor Prop 19 estimator run with your AIN
6. Correct form chosen: BOE-19-B, BOE-19-D and BOE-19-DC, BOE-19-V, BOE-19-P, or BOE-19-G
7. Homeowners' exemption (BOE-266) filed for the replacement or inherited home
8. Lender's payment estimate updated with the lower tax figure
9. Attorney or tax professional consulted on trusts, estates, or multiple properties

What this means day to day

For a long-time Los Angeles County homeowner over 55, Prop 19 can turn "we can't afford to move" into a real option. Downsizing, moving closer to family, or leaving the county no longer has to mean trading a small tax bill for a much larger one. In our examples, the difference is $6,500 to $10,000 or more a year, and it adds up for as long as you own the home.

For families inheriting a home, the decision is now practical, not just emotional. If someone in the family will live there, the low tax base can stay. If the plan is to rent it out, budget for a full reassessment.

For fire-affected families in Altadena and the Palisades, the rules give you time to decide, but the clock starts at the sale. Also on the calendar this fall: the Assessor's banner says the deadline to file a Decline-in-Value application for the 2026-2027 tax year is November 30, 2026, and the Assessor's disaster guide says Misfortune and Calamity claims must be filed within 12 months of a disaster.

With a median-priced Los Angeles County home costing about $6,012 a month in principal, interest, and base tax at 7.32%, a lower tax base is one of the few costs a qualifying buyer can actually control. Run the numbers before you list or buy.

If you're thinking about selling and buying under Prop 19, or you've inherited a home and aren't sure what to do next, Choice of America can help you map out the timing and the numbers with your tax professional.

Choice of America

Dr. Hamid Rowshan, DRE #02004794 | Company DRE #02240008

Call or text 833-THIS-BROKER (833-842-7465)

choiceofamerica.com | Los Angeles County real estate

Market figures are from Realtor.com's September 2026 county data for Los Angeles County. The payment example uses the September median listing price and Freddie Mac's 30-year PMMS average for the week of October 22, 2026 (7.32%). Examples A through D use hypothetical example values to show the math, and tax estimates use roughly 1% of taxable value as a stand-in for the base levy. Actual bills are roughly 1% plus local voter-approved charges and vary by tax rate area. Prop 19 rules are summarized from the California State Board of Equalization, the Los Angeles County Assessor, and Revenue and Taxation Code sections 63.2 and 69.6 as published; laws and adjustment amounts can change, and the Assessor makes the final determination on any claim. Choice of America is a real estate brokerage, not a law firm, tax adviser, or lender. This article is general information, not tax, legal, or lending advice. Consult a qualified attorney or tax professional about your situation.

Sources:

• Realtor.com Residential Data, county-level inventory core metrics (September 2026, Los Angeles County FIPS 06037: median listing price and YoY change, price per square foot, active listings, days on market, price_reduced_share): https://www.realtor.com/research/data/ (data file: https://econdata.s3-us-west-2.amazonaws.com/Reports/Core/RDC_Inventory_Core_Metrics_County.csv; also published on FRED as https://fred.stlouisfed.org/series/MEDLISPRI6037)
• Freddie Mac Primary Mortgage Market Survey (7.32% as of October 22, 2026): https://www.freddiemac.com/pmms
• California State Board of Equalization, Proposition 19 (comparison charts, FAQs, filing requirements checklist, $1 million amount adjustments): https://www.boe.ca.gov/prop19/
• California State Board of Equalization, Letter to Assessors No. 2025/009, Intergenerational Transfer Exclusion, Adjustment of the $1 Million Amount ($1,044,586): https://www.boe.ca.gov/proptaxes/pdf/lta25009.pdf
• California State Board of Equalization, Letter to Assessors No. 2026/002, 2026-27 California Consumer Price Index (1.02 inflation factor): https://www.boe.ca.gov/proptaxes/pdf/lta26002.pdf
• California State Board of Equalization, Letter to Assessors No. 2026/022, Disaster Relief for Damaged or Destroyed Property (Publication 802): https://www.boe.ca.gov/proptaxes/pdf/lta26022.pdf
• California State Board of Equalization, Homeowners' Exemption: https://www.boe.ca.gov/proptaxes/homeowners_exemption.htm
• California Revenue and Taxation Code section 69.6 (base year value transfers): https://california.public.law/codes/revenue_and_taxation_code_section_69.6 (official text: https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC&sectionNum=69.6)
• California Revenue and Taxation Code section 63.2 (parent-child and grandparent-grandchild exclusion): https://california.public.law/codes/revenue_and_taxation_code_section_63.2 (official text: https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC&sectionNum=63.2)
• Los Angeles County Assessor, Proposition 19: https://assessor.lacounty.gov/prop19/
• Los Angeles County Assessor, Forms: https://assessor.lacounty.gov/forms
• Los Angeles County Assessor, Disaster Relief Recovery Guide: https://res.cloudinary.com/los-angeles-county-assessor/image/upload/v1759252138/Factsheet/ASSR_DisasterRecovery.pdf
• Los Angeles County Assessor, BOE-19-V claim form and instructions: https://res.cloudinary.com/los-angeles-county-assessor/image/upload/v1622785296/Form/BOE-19-V.pdf
• Los Angeles County Assessor (office locations, Decline-in-Value deadline): https://assessor.lacounty.gov/