If you are 55 or older, California's Proposition 19 lets you sell your home and carry its property tax base to a replacement home anywhere in the state, up to three times. For an East Bay owner who bought years ago, that can be the difference between a new tax bill based on today's price and one close to what you pay now.

Here is how the transfer works, where the math can change, and what I would line up before you list.

What does Prop 19 allow for owners 55 and older?

Proposition 19 took effect April 1, 2021. The State Board of Equalization lists three groups who can transfer a base year value: homeowners 55 or older, homeowners who are severely and permanently disabled, and victims of wildfire or other natural disasters. The home you sell must be your principal residence, and the replacement becomes your new principal residence.

Before Prop 19, most owners got one transfer and were limited to certain counties. Now the BOE lists three transfers, and the replacement can be anywhere in California.

How is the new home's taxable value figured?

It depends on the replacement's market value compared with the market value of the home you sold. According to the BOE, the transferred base year value applies without adjustment when the replacement is worth no more than:

  • 100 percent of the original home's value, if bought before the original is sold
  • 105 percent, if bought in the first year after the sale
  • 110 percent, if bought in the second year after the sale

If the replacement is worth more, the difference is added to the transferred value. The BOE gives this example: an original home with a taxable value of $300,000 and a market value of $600,000, and a replacement worth $700,000. The replacement's taxable value becomes $400,000, which is the $300,000 plus the $100,000 difference.

What are the deadlines?

The replacement has to be bought or newly built within two years of the sale of the original home. The claim is filed within three years of buying the replacement, using form BOE-19-B for the 55+ transfer, with the county assessor where the replacement home is located. If you move within Contra Costa, that is the Contra Costa County Assessor.

What should you plan before listing?

  • Know your current taxable value. It is on your tax bill. The bigger the gap between it and today's market value, the more the transfer is worth.
  • Get a realistic sale value. The value tests compare market values, so an accurate estimate of your sale price sets your price ceiling on the next home.
  • Decide the order. Buying first holds you to 100 percent. Selling first gives you 105 or 110 percent but means a move in between.
  • Count your transfers. Three are allowed under Prop 19, so plan for future moves too.
  • Talk to a tax professional about capital gains on the sale, which is a separate question.

If you are weighing a 55+ community, see how 55+ communities work in California and how ownership works in Rossmoor. For the income tax side, see capital gains when selling a California home.

Frequently asked questions about Prop 19 for owners 55 and older

Can I move my property tax base if I am over 55 in California?

Yes. Under Proposition 19, homeowners 55 or older can transfer the base year value of a principal residence they sell to a replacement principal residence anywhere in California.

How many times can I use the Prop 19 transfer?

The State Board of Equalization lists three transfers for homeowners who qualify by age, disability or disaster.

How long do I have to buy the replacement home?

The replacement must be purchased or newly built within two years of the sale of the original home.

What if the new home costs more than the one I sold?

The transfer applies without adjustment up to 100, 105 or 110 percent of the original home's market value, depending on timing. Any amount above that is added to the transferred taxable value.

Which form do I file, and where?

Form BOE-19-B for the 55+ transfer, filed with the county assessor where the replacement home is located, within three years of buying it.

The Bottom Line on Prop 19 for 55+ Sellers

If you are 55 or older and have owned your East Bay home for a long time, Prop 19 can keep your property taxes close to where they are now when you move. The value tests and the order you buy and sell in decide how much of that you keep, so plan both before you list.

Thinking about downsizing?

Send me your address and I will help you estimate your sale value and what that means for your price range on the next home.

Find out what your home is worth

Or call or text 925-250-9611.

Sources

California State Board of Equalization, Proposition 19, for eligibility, number of transfers, timing, value tests, forms and the effective date. California State Board of Equalization, Introduction to Proposition 19, for where to file and the worked example (all checked September 2026).

Jaz Chand, Broker Associate | Homes With Accent
The Jaz Team at Merrill Signature Properties | DRE #01751823
Phone/Text: 925-250-9611 | Jaz@HomesWithAccent.com

General information only, not tax or legal advice. Eligibility and values depend on your facts. Confirm with the county assessor and your own tax professional before you buy or sell.