Prop 19 Explained: Property Tax Transfers for Homeowners 55+ Moving Within California

Many longtime California homeowners would like to downsize, move closer to family, or find a single-story home that is easier to maintain. What often stops them is not the price of the next home but the property tax bill that comes with it.

As California's Legislative Analyst's Office (LAO) explains, a home's taxable value is usually set at its purchase price and can rise by no more than 2% a year after that, while the typical property tax rate is about 1.1%. Because home values usually grow much faster than 2% a year, someone who bought decades ago may be paying taxes on a fraction of what the home is worth today. When they sell and buy again, the taxable value resets to the new purchase price, and the tax bill can jump dramatically.

Proposition 19, approved by voters in November 2020, was designed to ease that problem for homeowners 55 and older. Here is how it works and how to use it.

What Prop 19 Does

According to the official 2020 Voter Information Guide, Prop 19 allows homeowners who are over 55, severely disabled, or victims of wildfire or natural disaster to transfer their primary residence's tax base to a replacement residence. In practice, that means you can sell your current home and bring your lower taxable value (called your “factored base year value”) with you to your next home.

Prop 19 took effect for these transfers on April 1, 2021, and it replaced older rules (Propositions 60 and 90) that were far more limited. The biggest improvements are:

• Move anywhere in California. The old rules generally limited transfers to the same county or to a handful of participating counties. Now you can move from Contra Costa to Sacramento, San Diego, or anywhere else in the state.
• Buy a home at any price. Under the old rules, the new home had to cost the same or less. Now you can buy a more expensive home and still keep much of your tax savings.
• Use it three times. The old benefit could generally be used once in a lifetime. Prop 19 allows up to three transfers, even if you already used the old Prop 60 or 90 benefit.

To qualify based on age, you must be at least 55 on the date you sell your original home, and both the home you sell and the home you buy must be your primary residence.

How the Math Works

The key test is whether your new home is of “equal or lesser value” than the home you sold. The California State Board of Equalization (BOE) defines that based on timing:

• Buy before you sell: up to 100% of the sale price of your original home
• Buy within the first year after selling: up to 105%
• Buy within the second year after selling: up to 110%

If your new home falls within that limit, your existing taxable value transfers over unchanged. If it costs more, you still keep your base, but the difference is added to it.

Here is an example. Say you are 64 and have owned a Walnut Creek home since the late 1990s. Its factored base year value is $300,000, and you sell it for $1,100,000.

• Downsizing: You buy a Concord condo for $850,000 six months later. That is below 105% of your sale price, so your new home's taxable value is $300,000. At a 1.1% tax rate, that is roughly $3,300 a year instead of about $9,350 without Prop 19.
• Moving up: You buy a $1,300,000 home in Pleasant Hill 18 months after selling. The limit is 110% of $1,100,000, or $1,210,000. The $90,000 difference is added to your base, so your new taxable value is $390,000, still far below the $1,300,000 a typical buyer would pay taxes on.

The San Luis Obispo County Assessor walks through the same calculation the same way: when the replacement home is worth more, only the difference in value is added to the transferred base.

Key Rules and Deadlines

The BOE's Prop 19 guidance highlights several details that trip people up:

• The two-year window works in either direction. You can sell first and buy within two years, or buy first and sell your original home within two years.
• Buying first has a cost. If you buy before you sell, you will pay property taxes on the new home's full market value until your original home sells, and that difference is not refunded.
• There is no minimum ownership period. The home you sell simply has to be your primary residence at the time of sale.
• Co-owners are allowed. If a child or other family member goes on title with you to help you afford the new home, you can still transfer your base to the entire replacement home.
• It is not handled in escrow. You file a claim with the county assessor after both transactions close and you are living in the new home, within three years of buying it.

The question of whether to buy or sell first is especially important under Prop 19. Our guide, Should You Buy or Sell First?, walks through the tradeoffs, from contingencies and rent-backs to the risk of carrying two homes at once.

The Other Side of Prop 19: Inherited Homes

Prop 19 also changed what happens when parents pass a home to their children, and older homeowners planning their estates should know about it. Before February 16, 2021, a parent's low tax base could transfer to a child with no reassessment, even for rental properties. Now, as the LAO summarizes, the benefit applies only to a family home that the child moves into as their own primary residence, or to a family farm.

Even then, there is a value cap. If the home's market value exceeds its taxable value by more than about $1 million (an amount adjusted every two years), the excess is added to the child's taxable value. The BOE lists the current adjusted amount as $1,044,586 for transfers between February 16, 2025, and February 15, 2027. Because these rules are complex, families should talk with an estate planning attorney or tax advisor before transferring property.

How to File

You file your claim with the assessor in the county where your new home is located, not where you sold it. If you are moving within or into Contra Costa County, the Contra Costa County Assessor's Prop 19 page provides the forms you need, including:

• BOE-19-B, Claim for Transfer of Base Year Value to Replacement Primary Residence for Persons at Least Age 55 Years
• BOE-19-D and BOE-19-DC, for severely disabled homeowners
• BOE-19-V, for victims of wildfire or other natural disasters

You should also file for the homeowners' exemption on your new home. Keep copies of your closing statements for both properties, since the assessor will compare the sale price of your original home with the purchase price of your new one. Because a single missed detail can affect thousands of dollars in taxes each year, it is wise to confirm your eligibility with the assessor's office or a tax professional before you commit to a purchase.

Make Your Next Move Without the Tax Shock

For homeowners 55 and older, Prop 19 can turn a move that once seemed financially out of reach into a smart, affordable next chapter. Whether you want to downsize, move closer to the grandkids, or trade a two-story house for a single-level home, keeping your lower tax base can save you thousands of dollars every year.

The Vincent Rossi Real Estate Group helps East Bay homeowners in Walnut Creek, Concord, Pleasant Hill, Clayton, Martinez, and beyond time their sale and purchase to fit Prop 19's two-year window, price their current home strategically, find a replacement home that keeps them within the equal-or-lesser-value limit, and coordinate every step from listing to closing. Book a consultation to start planning your move.