California property taxes, and the rules that save people thousands
California taxes property differently from almost every other state. Understanding it changes what you can afford, when you should move, and what happens to your family's home. Most of this never comes up until it is too late to use.
How Proposition 13 works
Passed in 1978, Prop 13 is the foundation of everything else on this page. Three rules:
- The base rate is 1% of your property's assessed value, plus voter-approved local debt. In practice, Southern California effective rates usually land between 1.1% and 1.3%.
- Assessed value can rise at most 2% per year, regardless of what the market does. A home that doubles in market value over a decade sees its assessed value rise about 22%.
- Value resets on a change of ownership. When a property sells, it is reassessed at the new market value, usually the purchase price, and the 2% cap starts again from there.
This is why two identical houses on the same street can have wildly different tax bills. Your neighbour who bought in 1994 may pay $2,400 a year while you pay $11,000 for the same square footage. Nothing is wrong. that is the system working as designed.
What this means when you buy
Never budget from the seller's current tax bill. Listing sites and old disclosures often show it, and it can be a fraction of what you will pay. Estimate your own at roughly 1.1–1.25% of your purchase price, then add any Mello-Roos or special assessments on that specific parcel.
The supplemental bill nobody warns you about
Here is the surprise that reaches new owners four to twelve months after closing.
When you buy, the county keeps billing on the seller's old assessed value until it reassesses your property. Once it does, it issues a supplemental tax bill for the difference, retroactive to your closing date.
Two things make this painful. First, the amount can be thousands of dollars. Second, it is usually not paid from your impound account, your lender collected based on the old, lower figure, so the supplemental bill arrives addressed to you, due on its own schedule.
Set the money aside at closing
If you buy well above the seller's assessed value, estimate the gap and park that cash. A buyer purchasing at $800,000 from a long-time owner assessed at $250,000 should expect a substantial supplemental bill, and it is far easier to budget for in escrow than to absorb as a surprise eight months later.
Homeowners' exemption
If you own and occupy your home as your primary residence, California reduces your taxable value by $7,000. At typical rates that saves roughly $70 to $90 a year.
It is small, the amount has not changed since 1972, but it is free, it is yours, and you have to claim it. File the claim with your county assessor after closing. Many new owners never do and simply leave it on the table year after year.
Proposition 19: moving without losing your tax base
This is the most valuable rule on this page, and the most widely misunderstood.
Since April 1, 2021, Proposition 19 lets eligible homeowners transfer the assessed value of their current home to a replacement home, so they keep paying taxes based on their old, low value instead of the new purchase price.
It starts at 55, not 65
The single most common mistake. People assume they must wait until 65 and lose a decade of savings waiting for a birthday that does not matter. The threshold is age 55. Only one spouse on title needs to meet it.
Who is eligible
- Homeowners age 55 or older
- Severely and permanently disabled homeowners, at any age
- Victims of a wildfire or declared natural disaster whose home was substantially damaged
What Prop 19 changed for the better
The old rules (Propositions 60 and 90) were far more restrictive. Prop 19 removed most of what made them unusable:
| Old rules (Prop 60/90) | Now (Prop 19) | |
|---|---|---|
| Where you can move | Same county, or a county that opted in | Anywhere in California |
| Price of new home | Equal or lesser value only | Any value, more expensive is allowed |
| How many times | Once in a lifetime | Up to three times |
Taken together: a couple in their late fifties who bought in Van Nuys in the 1990s can sell, move to a single-story home in Valencia, buy something larger, carry their 1990s tax base with them, and still have two more transfers available later in life.
The transfer math
If your replacement home costs the same or less
Your existing assessed value transfers straight across. Nothing is added.
| Scenario | Assessed value | Approx. annual tax |
|---|---|---|
| Current home, owned since the 1990s | $200,000 | ~$2,200 |
| Sells for | $900,000 | , |
| Buys replacement home for $850,000 with transfer | $200,000 | ~$2,200 |
| Same purchase without transfer | $850,000 | ~$9,350 |
Savings in this example: roughly $7,150 every year, for as long as they own the home, growing as the alternative bill would have grown.
If your replacement home costs more
You still transfer, you just add the difference in market value on top of your old assessed value. The formula:
New assessed value = old assessed value + (new home price − old home sale price)
| Step | Amount |
|---|---|
| Old assessed value | $200,000 |
| Old home sells for | $900,000 |
| Replacement home costs | $1,100,000 |
| Difference added | $200,000 |
| New assessed value | $400,000 |
| Approx. annual tax with transfer | ~$4,400 |
| Approx. annual tax without transfer | ~$12,100 |
Buying a more expensive home and still cutting the tax bill by roughly $7,700 a year is exactly the outcome the old rules made impossible.
Deadlines and rules that trip people up
- Both homes must be your primary residence. Not a rental, not a second home, not an investment property.
- Two-year window. You must buy or build the replacement home within two years of selling the original, in either order. Buying first and then selling works.
- File form BOE-19-B with the county assessor where the replacement home is located. Filing within three years protects your full relief; file later and relief is generally prospective only, so you lose the back years.
- Three transfers, counted per person. Disaster victims are not limited to three.
- Nothing is automatic. No one at the county applies this for you. An eligible homeowner who never files simply pays the higher bill.
Where this gets planned, not just filed
Because the added amount depends on the gap between your sale price and your purchase price, the order and timing of the two transactions changes your result. That is worth modelling before you list, not after you are in escrow.
Inherited property: what Prop 19 took away
Prop 19 gave homeowners more freedom to move. It also sharply narrowed what children inherit, and this part catches families by surprise.
Before Prop 19, a child could inherit any property from a parent, including rentals and second homes, and keep the parent's low assessed value, with no requirement to live there.
Now, the exclusion is much tighter:
- It applies only to the parent's primary residence (or a qualifying family farm). Rentals and vacation homes are reassessed at full market value.
- The child must move in and claim it as their own primary residence, generally filing for the homeowners' exemption within one year of the transfer.
- There is a value cap. The protected amount is the parent's assessed value plus an inflation-adjusted allowance, $1,044,586 for transfers between February 16, 2025 and February 15, 2027. Market value above that ceiling gets added to the new assessment.
- Form BOE-19-P is used to claim it.
A conversation worth having early
Families who assumed a rental property would pass down at its 1980s tax base are finding the inherited bill several times larger than expected, sometimes forcing a sale. If this describes your family's situation, an estate planning attorney and a CPA should see it well before it becomes urgent. I am neither, but I can tell you when it is time to call them.
Property Tax Postponement at 62+
Separate from Prop 19, California's State Controller runs a Property Tax Postponement program that lets qualifying homeowners defer payment of their property taxes. The state pays the county and records a lien that is repaid later, typically when the home is sold or the owner passes away.
Current requirements:
- Age 62 or older, or blind, or disabled
- Household income of $57,002 or less
- At least 40% equity in the home, liens and mortgages cannot exceed 60% of market value
- You own and occupy the home as your primary residence
- No reverse mortgage on the property
- Interest accrues at 5% per year on postponed amounts
Funding is limited and applications are handled first-come, first-served, so qualifying does not guarantee approval. Apply early in the cycle through the State Controller's Office.
Disabled Veterans' Exemption
Veterans with a qualifying service-connected disability, and unmarried surviving spouses of eligible veterans, may exempt a substantial portion of their home's assessed value, vastly larger than the ordinary $7,000 homeowners' exemption. A higher exemption amount applies below an income threshold.
Both exemption amounts and the income limit are adjusted annually, so confirm current figures with your county assessor. You cannot claim this and the standard homeowners' exemption on the same property, take whichever is larger.
Mello-Roos and other additions
Your bill is not only the 1% base rate. Watch for:
- Mello-Roos (Community Facilities Districts). Common in newer developments, around here that means much of Valencia, Stevenson Ranch, Castaic, and newer tracts in the Antelope Valley, funding the schools, roads, and parks that made the development possible. It can add $2,000 to $5,000 or more per year, it is not capped by Prop 13's 2% limit, and it usually runs 20 to 40 years. Two similar homes a mile apart can differ by thousands a year because one sits in a CFD.
- Voter-approved bonds for school and infrastructure projects, added on top of the 1%.
- Direct assessments for lighting, landscaping, vector control, and similar district services.
- HOA dues are not property taxes, but they are part of the same monthly reality and lenders count them in your qualifying ratios.
Always ask for the full tax bill on the specific parcel before removing your contingencies. "About 1.2%" is a starting estimate, not an answer.
If your value falls
Prop 13 caps increases; it does not force you to pay on a value the market no longer supports. Under Proposition 8, if your home's market value drops below its assessed value, you can request a decline-in-value reassessment from your county assessor and have your taxes temporarily lowered.
The reduction is reviewed each year and reverses as values recover, up to your original Prop 13 base. It costs nothing to file, and it is worth knowing about if you buy near a market peak.
When payments are due
California splits the annual bill into two installments, and the due dates are not intuitive:
| Installment | Due | Delinquent after |
|---|---|---|
| First | November 1 | December 10 |
| Second | February 1 | April 10 |
This page is a starting point, not advice
I am a real estate agent, not a tax advisor or an attorney. Everything here describes how these rules generally work, and every one of them turns on the specifics of your situation, your county, and the exact property. Before you act, confirm with your county assessor, a CPA, or an estate planning attorney. Where it matters, I will tell you plainly that you need one of them, and help you find them.
Next step
Wondering what a move would cost you in taxes?
If you are 55 or older and have owned your home for a long time, the difference between moving correctly and moving carelessly can be thousands of dollars every year for the rest of your life. Send me your situation and I will walk you through the numbers.
Call or text (818) 381-1844.
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