Prop 19 and California Property Tax: A General Overview

Prop 19 changed two property tax tools in California, one for homeowners who are 55 or older and one for family transfers. At the time this article was written (October 2026), the San Diego County Assessor said homeowners who are 55 or older, or disabled, can use the base year value transfer up to three times, and the new home can be in any California county. The rules are detailed and have conditions. This guide is a general overview for learning. It is not tax or legal advice, and I am not a tax professional or an attorney.

What Prop 19 does

Prop 19 is a California ballot measure that changed two property tax tools. Both tools use your base year value. That is the taxable value set under Prop 13 when a property is bought or built. You can read the basics in my overview of how San Diego property taxes work.

The first tool lets some homeowners who are 55 or older, or disabled, move their base year value to a new home. The second tool covers some transfers from parents to children and from grandparents to grandchildren. The BOE says the family transfer changes started February 16, 2021, and the base year value transfer changes started April 1, 2021.

The BOE says that before Prop 19, the age 55 transfer worked only within the same county or between counties that had agreed to it. It says Prop 19 lets a homeowner move anywhere in California.

The transfer for homeowners 55 or older

At the time this article was written, the San Diego County Assessor's page described these general points about the base year value transfer.

• The homeowner must meet the age or disability condition when the original home is sold.
• Both the old home and the new home must qualify for the homeowners' exemption. In plain words, each must be a main home.
• The new home can be in any California county and can be any value.
• The transfer can be used up to three times.
• Some kinds of values, such as temporary Prop 8 values, do not transfer.

The BOE describes a timing rule. The new home generally must be bought or built within two years of selling the old one, and buying first is also covered if the old home sells within two years. These are summaries, and the full rules have more conditions.

How the price of the new home can matter

The BOE explains that if the new home costs the same or less than the old one, the base year value moves over unchanged. If it costs more, part of the difference may be added to the value that moves. The BOE says the limit used depends on when the new home is bought compared with the sale of the old one.

The BOE's page has its own examples and tables. I am not repeating them here, because a mistake in a tax calculation could mislead you. The County Assessor can explain how the numbers work for a specific purchase, and a tax professional can help with planning.

Family transfers

The BOE says Prop 19 limits the family transfer exclusion to a family home that is the main home of the parent and becomes the main home of the child, or to a family farm. It says rental homes passed between parents and children do not qualify.

The BOE also says there is a value limit, which is adjusted over time. If the market value is above the limit, the extra amount can be added to the base year value.

The County Assessor adds more points. The Assessor says the exclusion is not automatic, and a claim must be filed and approved. It also describes conditions for grandchildren, and it says the home must stay the main home of the person who received it. Because these details are complex, the Assessor and an attorney or tax professional are the right people to ask.

Forms and deadlines

At the time this article was written, the County Assessor's website listed separate application and claim forms for the age 55 transfer and for family transfers. It also listed filing deadlines.

I am not listing the deadlines here. They differ by situation, they can change, and a missed deadline can matter. The Assessor's website and a tax professional can confirm the current forms and dates.

Why timing comes up for buyers and sellers

Prop 19 can come up when people plan a sale and a purchase. As a REALTOR, I can talk about the market side of timing, such as what selling costs and what a sale may net. My guides on the cost to sell a home in San Diego and net proceeds from selling cover that side.

The tax side is different. Whether Prop 19 applies, and how, is a question for the County Assessor and a licensed tax professional or attorney. That is also true for inherited homes, where timing and claim steps can depend on the facts.

Please talk with a professional

Prop 19 is detailed. The BOE has posted new guidance more than once since 2021, and some of its dollar amounts are adjusted over time. I did not use the newest adjusted amount here.

I am a REALTOR, not a tax professional or an attorney. This guide is not a prediction of what will apply to you. Please contact the San Diego County Assessor and talk with a licensed CPA, tax professional or attorney about your own facts.

Questions people bring to the County Assessor or a professional

• Do I meet the age, disability and main home conditions?
• How do the two-year timing rules apply to my plans?
• How could the price of a new home change the result?
• Which forms do I file, and by when?
• For a family transfer, how will the home be used afterward?

Related guides

• How San Diego property taxes are calculated
• How Mello-Roos taxes work in San Diego
• ADU rules, costs and rental income in San Diego
• Junior ADU vs. detached ADU in San Diego
• The cost to sell a home in San Diego
• Net proceeds from selling a home in San Diego

Frequently asked questions

What is Prop 19 in California?

It is a state ballot measure that changed property tax rules for some moves and some family transfers. It lets some homeowners 55 or older, or disabled, move their base year value to a new home, and it limits some parent-child and grandparent-grandchild exclusions.

How many times can the Prop 19 age 55 transfer be used?

At the time this article was written, the San Diego County Assessor said it can be used up to three times, and the new home can be in any California county. Conditions apply, so please check with the Assessor.

How long is the window to buy a new home under Prop 19?

The BOE describes a general two-year window around the sale of the old home. The full rules have more conditions, so please check with the County Assessor or a tax professional.

Can someone keep a parent's property tax base after inheriting a home?

Only in some cases, and the rules are detailed. The BOE describes conditions such as main home use and a value limit. The County Assessor and an attorney or tax professional can explain how it applies to a specific case.

Is the Prop 19 transfer automatic?

No. The County Assessor says an application or claim must be filed. Forms and deadlines are on the Assessor's website, and a tax professional can explain them.

About the author

Trevor Landress is a San Diego REALTOR® with Coldwell Banker West (DRE# 02126901). He was born and raised in San Diego and has been licensed since 2021. Trevor helps homeowners sell, guides first-time buyers through the home buying process and assists investors with their next acquisition. His work includes negotiating offers, analyzing market trends, building pricing strategies and running marketing campaigns for his listings.

He serves clients across San Diego County, from coastal communities like La Jolla, Del Mar and Carlsbad to neighborhoods inland. Trevor is part of the Campbell Group, a three-generation real estate team, and he and the Campbell Group consistently rank as a top producing team at Coldwell Banker West each month. He writes these guides to help San Diego buyers and sellers navigate an ever-changing market.

Each guide on this blog is built from official or primary sources, and the text names the source and the month it was checked. When a fact can go stale, such as a rate, a fee, a deadline or a rule, the guide says so. The goal is plain answers you can use before you make a big decision.

Trevor is a REALTOR, not a tax advisor, attorney, lender or contractor. For questions in those areas, he recommends you check with the right professional. To talk through your plans, call or text (619) 402-4614 or contact Trevor Landress.

How I help San Diego home buyers

Trevor guides first-time buyers through the home buying process, from setting a budget to closing. His work includes negotiating offers and analyzing market trends so buyers understand what a home may really cost to own.

How I help San Diego home sellers

Trevor helps homeowners sell with pricing strategies, marketing campaigns, offer negotiation and market analysis, so sellers know what to expect before they list.

Sources

• California State Board of Equalization, Proposition 19 (checked October 2026)
• San Diego County Assessor, Property Tax Relief for Seniors (checked October 2026)
• San Diego County Assessor, Parent to Child Exclusion (checked October 2026)

This guide is general information only. It is not tax, legal or financial advice, and I am not a tax professional or an attorney. Please talk with a licensed CPA, tax professional or attorney, and with the County or the agency named above, before you make any decision.