55 or Older and Selling? Prop 19 Lets You Take Your Low Property Tax Base With You

If you have owned your home for a long time, your property tax bill is probably one of the best deals in your budget. Under Proposition 13, the general tax rate is capped at 1% of your home's taxable value (plus voter-approved local add-ons), and that taxable value can rise no more than 2% a year, no matter what the market does. The catch used to be that the deal stayed with the house: sell, and your next home got taxed at its full purchase price. Since April 2021, California's Proposition 19 has changed that for a lot of Central Valley owners. Here is how it actually works.

1. The rule in plain English

If you are 55 or older when you sell your principal residence, Proposition 19 lets you transfer its taxable value - what the state calls the factored base year value - to a replacement principal residence anywhere in California. A few key points from the State Board of Equalization:

• Any county works. Your replacement home can be anywhere in the state. Stay in Lodi, move closer to grandkids in Folsom, head to the coast - the transfer follows you.
• You can use it up to three times. The old rules allowed one transfer; Proposition 19 allows three.
• There is a two-year window. You must buy or newly construct the replacement home within two years of selling the original - before or after the sale.
• Both homes must be principal residences, eligible for the homeowners' exemption. This is for the home you live in, not rentals.
• The same transfer also covers homeowners who are severely disabled and victims of wildfire or natural disaster.

2. What the numbers can look like

Here is an illustration with stated assumptions - it is our own math, not a quote for any home. Say you bought your Lodi home in 1999 for $170,000. With the 2% annual cap, its taxable value today might be roughly $290,000, so at about 1% plus local assessments your annual bill lands in the neighborhood of $3,200.

Now say you buy a replacement for $750,000 before selling that home for $650,000. Buying before the sale means the equal-or-lesser test is 100% of your sale price:

• Without the transfer, the new home is taxed near its purchase price - roughly $8,250 a year at the same rough rate.
• With the transfer, you keep your $290,000 base and add only the $100,000 price difference: a new taxable value of about $390,000, or roughly $4,300 a year.

That is a difference of about $4,000 in the first year of this illustration - the assessor sets the actual assessed values, and the gap can change over time as both taxable values adjust under the 2% annual cap. If your replacement costs the same or less than your sale price, there is nothing to add - your lower base carries over as-is, subject to a timing rule covered below. Real tax rates vary by district, supplemental tax bills are separate, and the assessor sets the official values, so treat these figures as a way to see the shape of the benefit, not the exact dollars.

3. The fine print that trips people up

• It is not automatic. You have to file a claim with the county assessor where your replacement home is. In San Joaquin County, that is form BOE-19-B, and the Assessor accepts it online. Do this as part of your move, not years later.
• The equal-or-lesser test has a clock. Buy before you sell, and the replacement can cost up to 100% of your original home's market value with nothing added. Buy in the first year after selling, and the allowance is 105%; in the second year, 110%. Anything above that gets added to your transferred base, as in the example above.
• Market value is not your estimate. The assessor confirms the value of both properties, and there is a form for that certification too.
• Three transfers per person over a lifetime, so it is worth using them thoughtfully.

4. One more change worth knowing if family property is involved

Proposition 19 also tightened the rules for homes passed from parents to children. The exclusion from reassessment now requires the child to make the home their own principal residence, and it is capped at the home's taxable value plus an inflation-adjusted amount - $1,044,586 for transfers between February 16, 2025 and February 15, 2027, up from the original $1 million. The state adjusts that amount every two years, with the next adjustment due in February 2027. Rental homes and vacation properties no longer qualify for that exclusion at all. If keeping a home in the family is part of your thinking, it is worth reviewing these rules before assuming the old ones apply.

5. Bottom line

For long-time owners, Proposition 19 removed one of the biggest financial reasons to stay put. Whether a move actually pencils out depends on your taxable value, where you would go, and what you would buy - and that is a set of numbers we are glad to walk through with you, alongside your tax professional. This post is general information, not tax or legal advice; your county assessor and your tax adviser have the final word on your situation. If you would like to see what your own transfer could look like, reach out to The Halstead Team and we will put the numbers together. No pressure either way.

Sources

• California State Board of Equalization, Proposition 19: boe.ca.gov/prop19
• San Joaquin County Assessor, Base Year Transfers for Owners 55 and Older (rules and claim form BOE-19-B): sjgov.org/department/assessor/tax-savings-exemptions/base-year
• California State Board of Equalization, California Property Tax: An Overview (Proposition 13 basics): boe.ca.gov/proptaxes/pdf/pub29.pdf
• Board of Equalization Letter to Assessors 2025/009 (current adjusted exclusion amount and dates): boe.ca.gov/proptaxes/pdf/lta25009.pdf
• Dollar example: Halstead Team illustration using the rules above; figures are assumptions, not quotes.