Prop 19 for California homeowners 55 and older: how to move and keep your property-tax base

If you’ve owned your home for a long time, your property tax is probably based on a value from decades ago. For a lot of South Bay owners, the assessed value is a fraction of what the house would sell for today.

For years, that low tax bill was a reason to stay put. Buying another home meant a new assessment at today’s prices, and a property-tax bill that could jump several times over.

Proposition 19 changed that for homeowners 55 and older. You can now sell your home, buy or build another one almost anywhere in California, and bring your old assessed value with you. Here’s how it works, where the timing rules catch people, and what else to plan around before you move.

General education, not tax or legal advice. Figures and rules below come from the California State Board of Equalization and current federal law as of September 2026. Confirm the details for your own situation with Brad or Dev and a qualified CPA or attorney before you act.

What Prop 19 does

Prop 19 passed in November 2020. The part that matters most for longtime owners took effect on April 1, 2021.

It lets an eligible homeowner transfer the “taxable value” of their primary residence to a replacement primary residence. Taxable value is your original purchase price (the base year value) plus the small yearly increases allowed under Prop 13, capped at 2 percent a year. In the Bay Area, that number is often far below market value.

Normally, buying a home resets the assessment to the purchase price. With a Prop 19 transfer, the assessor starts from your old taxable value instead, with an adjustment if the new home costs more than the old one sold for. Your property tax on the new home is then based on that lower number.

Prop 19 replaced the older Prop 60 and Prop 90 rules. Those allowed one transfer, usually within the same county or to a handful of participating counties, and only to a home of equal or lesser value. Prop 19 works in every county, allows up to three transfers, and allows moving up in price with an adjustment.

Who qualifies

You can use a Prop 19 base year value transfer if you are:

• 55 or older on the date you sell your original home. You can be younger than 55 when you buy the replacement, as long as you’re 55 by the sale. If you’re married, only one spouse needs to be 55.
• Severely and permanently disabled, at any age.
• A victim of a wildfire or natural disaster whose home was substantially damaged, at any age.

The rest of this article focuses on the 55-and-older version. The disability and disaster versions follow nearly the same rules with different forms.

The original home has to be your principal residence, meaning eligible for the homeowners’ exemption, either when you sell it or within two years of buying the replacement. Vacation homes and rentals don’t qualify. The replacement also has to become your principal residence.

A home held in your revocable living trust generally qualifies, because you’re still treated as the owner. Property owned by a corporation or other legal entity does not.

The rules at a glance: any county, up to three times, a two-year window

• Anywhere in California. Any county, from Los Gatos to Sacramento to San Diego. Moving out of state doesn’t qualify.
• Up to three times in your lifetime. Earlier Prop 60 or Prop 90 transfers don’t count against the three.
• Two-year window. You must buy or finish building the replacement within two years before or after selling the original.
• It must be a real sale. The original home has to be sold for value (cash, debt, or an exchange of property). Giving it away doesn’t count.
• Any price. The replacement can cost more or less than the original. If it costs more, part of the difference is added to your transferred value. See the value test below.
• New construction counts. You can build a replacement. The date construction is completed is what counts for timing.
• File with the county assessor where the replacement is located, using Form BOE-19-B. File within three years of buying the replacement to get the full benefit.

The value test: what happens if the new home costs more

This is where the timing of your move changes the math. The assessor compares the replacement’s market value to the original’s market value at the time of sale, using a percentage that depends on when you buy:

• Bought before you sell the original: the replacement can be worth up to 100 percent of the original.
• Bought in the first year after the sale: up to 105 percent.
• Bought in the second year after the sale: up to 110 percent.

If the replacement falls within that limit, your old taxable value transfers as is (plus any inflation adjustments between the two dates). If the replacement is worth more, the amount above the limit is added to your transferred value.

Example (hypothetical numbers). You bought your Cupertino home in the early 1990s. Its taxable value today is about $450,000. You sell it for $2,800,000.

• You buy a $2,000,000 home near your kids eight months later. That’s under the limit, so the new home’s taxable value starts around $450,000 instead of $2,000,000.
• You buy a $3,200,000 home eight months later instead. The limit is 105 percent of $2,800,000, which is $2,940,000. The $260,000 above that is added, so the new taxable value is about $710,000.

At California’s base rate of 1 percent plus local bonds and assessments, the difference between a $450,000 and a $2,000,000 assessed value is well over $15,000 a year in property tax, every year you own the home.

Buying first or selling first

The letter we send talks about planning the move in the right order. Here’s why it matters.

Selling first gives you cash in hand and no pressure to buy fast. It also gives you the most room on price: up to 105 percent in year one and 110 percent in year two. The costs are finding somewhere to live in between and moving twice.

Buying first lets you move once and take your time finding the right home. The limit drops to 100 percent of the original’s value, so moving up in price costs more in added value. You also need a way to buy before your equity is free. Common options are a bridge loan, a home equity line of credit on the current home, or other financing a lender can walk you through.

What catches people:

• Missing the two-year window. The clock runs from the sale of the original, in both directions.
• Buying a home that’s worth more than the limit without realizing part of it will be added to the taxable value.
• Letting the original home stop being their principal residence too early. For example, moving out and renting it for a few years before selling.
• Transferring the house to a child instead of selling it. That uses the parent-child rules instead, and you lose the base year transfer.

Your equity, timeline, and where you want to land decide which order works best. Mapping it out before you list is part of what a call with Brad and Dev covers.

How to file

File Form BOE-19-B (Claim for Transfer of Base Year Value to Replacement Primary Residence for Persons at Least Age 55 Years) with the assessor in the county where your new home is. Disabled owners file BOE-19-D with a physician’s certificate (BOE-19-DC). Disaster victims file BOE-19-V.

File within three years of buying or finishing the replacement to get the benefit from the start. A late claim is still accepted, but the lower value applies only from the year you file.

Filing soon after you close also helps avoid a supplemental tax bill based on the full purchase price that later has to be corrected. Keep your closing statements for both homes. The assessor will want dates and prices.

What Prop 19 changed for your kids

The same proposition that helps you move made it harder to pass a low tax base to your children.

Before February 16, 2021, parents could usually pass their home, plus up to $1 million of other property, to their children without reassessment. Now:

• Only the family home (or a family farm) can keep the parents’ tax base. Rentals, vacation homes, and other property are reassessed at market value when they pass to children.
• A child has to move in. The child must make it their principal residence and file for the homeowners’ exemption within one year of the transfer.
• The benefit is capped. The exclusion covers the parents’ taxable value plus $1,044,586 (the figure for transfers from February 16, 2025 to February 15, 2027; it adjusts every two years). Value above that is added to the child’s assessment.
• Grandchildren qualify only if the parent in between has passed away.

In the South Bay, the cap matters. Say your home has a taxable value of $450,000 and is worth $2,800,000 when your child inherits it and moves in. The child’s taxable value becomes about $1,755,000 ($2,800,000 minus $1,044,586), not $450,000. If no child moves in, it becomes $2,800,000.

Transfers completed before February 16, 2021 kept their old treatment. Prop 19 isn’t retroactive.

A group has been trying to put a partial repeal on the ballot. As of September 2026, it did not qualify for the November 2026 ballot, so these rules stand.

The capital gains side of the move

Property tax is only part of the picture. If you’ve owned your home for decades, selling it can mean a large capital gain, and that tax is separate from anything Prop 19 does.

• Home-sale exclusion (Section 121). If you’ve owned and lived in the home for at least two of the last five years, you can exclude up to $250,000 of gain, or $500,000 for a married couple filing jointly. Many longtime South Bay owners have gains well above that.
• Gain above the exclusion is taxed. Federally at long-term capital gains rates (up to 20 percent), plus a 3.8 percent net investment income tax for higher incomes. California taxes the gain as ordinary income, up to 13.3 percent.
• Your basis includes improvements. Remodels, additions, and other capital improvements over the years raise your basis and lower the gain. Receipts matter.
• A primary home can’t be 1031 exchanged. A 1031 exchange is for investment property. If part of the property was a rental or you own other rentals, other options open up.

Prop 19 and the home-sale exclusion work independently. You can use both on the same move: the exclusion on the sale, and the base year transfer on the purchase.

The estate planning side: selling now or holding

For some owners, the right answer is to hold the home rather than sell it, and this is worth understanding before you decide.

• Step-up in basis. When someone dies, their heirs generally receive the property at its market value on the date of death. The built-up gain is erased for income tax purposes.
• The California community property rule. For a married couple holding the home as community property, when the first spouse dies, the whole home (both halves) generally gets a new basis at market value. The surviving spouse may then be able to sell with little or no capital gain. How your title is held (community property, joint tenancy, or in a trust) affects this, so it’s a question for your estate attorney.
• Surviving spouse and the exclusion. A surviving spouse who sells within two years of the death can generally still use the $500,000 married exclusion.
• Estate tax. California has no estate or inheritance tax. The federal estate tax exemption is $15 million per person in 2026, so it affects only very large estates.

The trade-off: holding for the step-up means not using the equity now for the move you want, and it gives up the Prop 19 transfer on this home. Which matters more depends on your health, your plans, your family, and how much gain is at stake. A CPA and estate attorney should run both paths with your real numbers.

Questions we hear about eligibility

Do both spouses need to be 55? No. If you’re married, only one spouse needs to be 55 or older on the date the original home is sold.

Can I move to another county? Yes. Prop 19 works in all 58 California counties. It doesn’t work for a home outside California.

Can I buy a condo or townhome? Generally yes, as long as it becomes your principal residence and qualifies for the homeowners’ exemption.

My home is in a living trust. Does that matter? A revocable living trust generally doesn’t affect eligibility, because you’re still treated as the owner. Irrevocable trusts and entity ownership are different, so check with your estate attorney.

I used Prop 60 years ago. Can I still use Prop 19? Yes. Prop 19 allows up to three transfers, and earlier Prop 60 or Prop 90 transfers don’t count against them.

Can I co-own the new home with my child? Yes. You don’t need to be the sole owner of the replacement. How the transfer applies to a shared purchase is worth confirming with the assessor.

Questions we hear about timing and money

Does the new home have to cost less? No. It can cost more. Any value above 100, 105, or 110 percent of your original home’s sale value (depending on when you buy) is added to your transferred value.

What if I buy the new home before I sell? That works, as long as you sell the original within two years. The value limit is 100 percent of the original’s market value, and you’ll need financing to buy first.

Can I rent out my current home instead of selling it? Not if you want the base year transfer. The original home has to be sold. Keeping it as a rental also means it’s reassessed if it later passes to your children.

How much could I save? It depends on your current taxable value, what you buy, and your county’s local levies. As a rough rule, every $100,000 of assessed value is about $1,000 to $1,300 a year in property tax in the South Bay. The gap between your old assessed value and a new purchase price is the number to look at.

Can I sell my home to my child and still use Prop 19 on my next home? Yes, if it’s a real sale for value. If you transfer the home to your child and the child claims the parent-child exclusion, you can’t also use the base year transfer.

Where to go from here

Prop 19 works best when the move is planned in the right order. That means knowing your current taxable value, your likely gain on the sale, the limit on your replacement price, and whether selling or holding serves your family better.

Brad and Dev lay out every option with you: the numbers, the timelines, and the logistics. It’s a free, no-pressure call. Text or call (650) 668-3288, or book a time on this page.

Brad Pickens (Broker, DRE# 02007206) and Dev Singh (Realtor, DRE# 01943535) are licensed California real estate professionals. Equity Exit Pros shares general education only, not tax or legal advice. Tax and legal advice comes from the qualified CPAs and attorneys we coordinate.