California property tax rate: how the 1% rule actually works

Last updated 2026-07-09

What is California's property tax rate?

California's base property tax rate is exactly 1% of assessed value. That cap has been in the state constitution since voters passed Proposition 13 in June 1978. ^[1] The California Constitution, Article XIII A, Section 1, puts it plainly: "The maximum amount of any ad valorem tax on real property shall not exceed one percent (1%) of the full cash value of such property." ^[1]

That 1% flows into a pool. County auditors split it among local governments, schools, and special districts using a formula set by the state. You don't pick where it goes.

But 1% is the floor for the state's share, not the ceiling on your total bill. Your effective rate almost always lands higher once local add-ons get counted. More on that below.

Why is my actual tax bill higher than 1% of what I paid?

Two things push your effective rate above the 1% baseline. Voter-approved bonds and special assessments.

Start with bonds. Proposition 13 carved out one explicit exception: local governments can tax above 1% if two-thirds of voters approve a bond measure. ^[1] School districts, community college districts, and cities use it constantly. A school bond in Los Angeles Unified, a library bond in Santa Clara County, a hospital bond in San Mateo County, they each land as a separate line on your bill, expressed as dollars per $1,000 of assessed value (or the same thing stated as a percentage). ^[2]

Then come direct levies and special assessments. These are flat dollar charges for specific services: mosquito abatement, lighting districts, Mello-Roos Community Facilities Districts. ^[3] Mello-Roos charges show up in subdivisions built after 1982 and can add several thousand dollars a year on top of your base tax.

Add the base 1% to typical bond overrides and effective rates across California counties usually fall between 1.1% and 1.6% of assessed value. Some Mello-Roos pockets in newer Southern California suburbs push the all-in rate past 2%. ^[4]

The California State Board of Equalization publishes how the base 1% gets apportioned among local entities. It doesn't cap or consolidate the bond add-ons. That's why two neighbors in different school districts can owe meaningfully different amounts on identically assessed homes.

How does Proposition 13 set assessed value?

Prop 13 did two jobs. It capped the rate at 1% and it rewrote how properties get assessed. Under Prop 13, a property's assessed value (county records call it the "taxable value") is set at its purchase price when you acquire it. ^[1] That base value can rise no more than 2% a year, no matter what the market does. ^[1]

So two identical houses on the same block can carry wildly different assessed values, and wildly different tax bills, based on nothing but when each one sold. A homeowner who bought in 1995 might be assessed at $180,000 on a house that sold last year for $900,000. The new buyer starts at $900,000 on day one.

The 2% cap is a ceiling, not a promise. If the California Consumer Price Index rises less than 2%, the annual increase is limited to that lower CPI figure. ^[5] In some recent years the bump has come in under 2%.

A "change of ownership" triggers a full reassessment to current market value. So does new construction or a substantial addition. Routine maintenance and repairs don't. ^[5] The county assessor decides what counts as a change of ownership, and the exceptions matter. Certain transfers between parents and children, and transfers to a spouse, can keep the low assessed value intact.

What is the effective property tax rate across California counties?

The 1% base rate is uniform statewide. What changes county to county is the total effective rate once bond overrides pile on. The table below shows approximate effective rates for selected large counties, drawn from fiscal year 2023-24 county tax rate area schedules. ^[2][4] These are weighted averages across all tax rate areas in each county. Your specific parcel's rate can differ.

County	Approx. effective rate (FY 2023-24)
Los Angeles	1.16%, 1.25%
Santa Clara	1.14%, 1.20%
San Diego	1.05%, 1.19%
San Mateo	1.05%, 1.15%
Contra Costa	1.12%, 1.30%
Riverside	1.08%, 1.35%
Fresno	1.05%, 1.22%
Sacramento	1.08%, 1.28%

These ranges leave out Mello-Roos special taxes, which sit outside the property tax rate framework and show up as flat dollar amounts. If your parcel sits in a Mello-Roos district, check your county's secured tax roll for the special tax line items.

For the full list of every tax rate area in a county, each auditor-controller publishes an annual tax rate book. Los Angeles County Auditor-Controller, Santa Clara County, and Contra Costa County post these online. ^[2][6]

How is my property tax bill actually calculated?

The math is simple once you have two numbers: your assessed value and your tax rate area's total rate.

Step 1: Find your assessed value. It's on your annual Assessment Notice from the county assessor, usually mailed in late July or early August. It's also on your tax bill. Two components make it up: land value and improvement value. Both fall under Prop 13 limits if they've been on the roll before.

Step 2: Find your total tax rate. Your bill lists each piece. Add the 1% base levy, each bond override (a rate per $100 of assessed value), and any rate-based assessments. The sum is your total rate for your tax rate area.

Step 3: Multiply. (Assessed value / 100) x total rate = base tax due. Then tack on any flat special assessments (Mello-Roos and the like) listed separately.

Here's an example. A home assessed at $650,000 in a tax rate area with a 1.18% total rate owes $7,670 in base property tax. Add a $1,400 Mello-Roos charge and the total bill is $9,070, an all-in effective rate of about 1.40%.

California property taxes come in two installments. ^[7] The first (July through December) is due November 1 and goes delinquent after December 10. The second (January through June) is due February 1 and goes delinquent after April 10. Miss those dates and a 10% penalty attaches on the spot. No grace period past the delinquency date.

What exemptions can reduce my taxable assessed value?

Several exemptions trim the assessed value used to calculate your 1% base levy.

Homeowners' Exemption. The standard homeowners' exemption cuts assessed value by $7,000 for an owner's primary residence. ^[8] That saves you exactly $70 a year at the 1% base rate. Modest, yes. But it's automatic once you file the initial claim, and you never refile as long as you stay the owner-occupant. File with your county assessor.

Disabled Veterans' Exemption. Qualifying disabled veterans get a far larger break, roughly $161,082 to $241,627 in assessed value exempted, indexed each year for inflation. ^[8] Low-income disabled veterans who meet the income threshold get the higher tier.

Proposition 19 parent-child and grandparent-grandchild transfers. Effective February 16, 2021, Prop 19 sharply narrowed the old parent-child exclusion. ^[9] A parent-to-child transfer of a primary residence now excludes only the first $1,000,000 of value above the transferor's assessed value. Transfers of non-primary-residence property between family members no longer qualify at all. If you got or are planning a family transfer, the new rules are much tighter than the ones that ran before 2021.

Proposition 60/90 (now replaced by Prop 19). Before Prop 19, seniors 55 and older could move their low assessed value to a replacement home once, within the same county (Prop 60) or a participating county (Prop 90). Prop 19, effective April 1, 2021, replaced those rules with a more generous version: up to three transfers to any county in California, though the value-transfer math is different. ^[9] If you moved before that date and used the old exclusion, your carryover stays put.

Senior, Blind, and Disabled Postponement Program. This one isn't an exemption. The California State Controller's Office runs a program that lets qualifying low-income seniors or disabled homeowners defer tax payments at a low interest rate instead of reducing the assessed value. ^[10]

Can my assessed value go down, and when should I appeal?

Yes, it can go down. California Revenue and Taxation Code Section 51 requires assessed value to be the lower of (a) the Prop 13 factored base year value or (b) the property's current market value as of January 1. ^[5] When market values drop below a property's Prop 13 cap, the assessor is supposed to apply a "Decline in Value" reassessment (people call it a Proposition 8 review, after a 1978 statutory amendment, not the ballot measure). ^[5]

In practice, assessors don't always apply these reductions automatically, or they don't apply them in full. That's your opening to appeal.

California's standard appeal deadline is November 30 of the assessment year in most counties. ^[11] Some counties with a January 1 lien date and July notices run deadlines to September 15. Your county's exact deadline is on your assessment notice. Miss it and you lose the right to appeal for that year.

You file with the county Assessment Appeals Board (AAB), not the assessor's office, though many counties push you toward an informal review with the assessor first. The filing fee usually runs $0 to $30 depending on the county.

To win a Decline in Value appeal, you need proof that your property's fair market value as of January 1 was lower than the assessed value on your notice. Comparable sales pulled from the county's own sales data, the MLS, or a licensed appraiser's report are the standard evidence. If you'd rather build that case yourself and skip a contingency firm, a structured DIY approach like the appeal kit at TaxFightBack walks you through pulling and presenting comps in the format boards find persuasive.

One honest caveat. If your Prop 13 base year value already sits well below market, a decline-in-value appeal probably fails, because your assessed value is already lower than what the property would sell for. Appeals earn their keep when you bought recently at or near market, or when prices have dropped hard since your last reassessment.

What happens to assessed value when I buy a home in California?

The county assessor reassesses your property to its full purchase price the day escrow closes. That's your new base year value. ^[5] From there, the 2%-a-year inflation cap runs going forward.

Supplemental assessments. When you buy, you'll get one or two supplemental tax bills on top of your regular annual bill. ^[7] They cover the gap between the prior owner's assessed value and your new higher one, prorated for the part of the fiscal year left when you took title. Supplemental bills catch buyers off guard because they land months after closing, after the main tax bill already went out.

New construction supplementals work the same way. Add a bedroom or an ADU and the assessor values only the new construction, adding that amount to the base roll. The existing structure keeps its old assessed value.

If you paid well over fair market value (say a bidding war where you came in $100,000 above asking), you can ask the assessor to review whether the purchase price really reflects market value, or you can appeal to the AAB. Purchase price is presumed to equal market value under California law, but that presumption is rebuttable with adequate evidence.

How do California property taxes compare to other states?

California's effective property tax rate actually sits below the national average, mostly because Prop 13 keeps assessed values from chasing current market values. The Lincoln Institute of Land Policy and the Tax Foundation both peg California's effective rate around 0.70% to 0.76% of true market value, well under the national median of roughly 1.0% to 1.1%. ^[4]

Here's the catch. California home prices rank among the highest in the country, so the dollar amount paid per homeowner is still steep in absolute terms. The Census Bureau's American Community Survey puts median annual property taxes paid by California homeowners in the $4,000 to $5,500 range, depending on the year and county. ^[4]

Other states run entirely different systems. Look at property tax in New York City and Miami-Dade property taxes, and Hennepin County property tax in Minnesota assesses at market value every year with no inflation cap like Prop 13.

Within California, the difference between owning in Los Angeles (check LA County property tax details) versus Santa Clara property tax or San Mateo County property tax mostly comes down to which bond measures local voters approved, not the base rate, which is always 1%.

If you're sizing up how California stacks up before buying, or before deciding whether an appeal is worth the effort, the property tax taxation overview here covers the structural differences in more depth.

What are supplemental and escaped assessments?

Two kinds of assessments fall outside the normal annual cycle and blindside owners who don't know to expect them.

Supplemental assessments. As noted above, these cover mid-year changes in ownership or completed new construction. California Revenue and Taxation Code Section 75 governs the supplemental roll. ^[7] The county sends a supplemental bill separate from the regular secured roll bill. If the assessment date falls between January 1 and May 31, you get two supplemental bills: one for the rest of the current fiscal year, one for the next full year. If it falls between June 1 and December 31, you get a single bill for the remaining partial year.

Escaped assessments. If taxable property got left off the roll by accident, or assessed too low because of assessor error, the county can issue a retroactive "escaped assessment" reaching back up to four years. ^[5] These show up with no warning and cover back taxes plus a small interest charge. They're fairly rare. But owners of new construction finished without a permit sometimes see one when a building inspection finally catches the unpermitted work.

How do I read my California property tax bill?

County tax collectors mail California property tax bills in late October or early November. A few sections are worth knowing.

Parcel number (APN). The assessor's parcel number identifies your specific lot. Every other document, exemption filing, and appeal references it.

Assessed values. The bill breaks out land value, improvement value, and personal property value (if any) separately. It also lists any exemptions applied. The net assessed value is what gets taxed.

Tax rate area. A four- to six-digit code marking the exact combination of taxing entities whose levies hit your parcel. ^[2] Two parcels on the same street can sit in different tax rate areas.

Line-item levies. Below the 1% base levy, each bond measure appears separately with its rate and dollar amount. The descriptions are often shorthand ("LAUSD GO Bond 2020") but enough to trace the source.

Special assessments. Flat-dollar charges for Mello-Roos districts, lighting districts, vector control, and similar services sit at the bottom, often with their own total.

Delinquency dates. The bill states the December 10 and April 10 delinquency deadlines up front. If your mortgage servicer pays through an impound (escrow) account, confirm they got the bill. Servicer errors that trigger delinquency penalties happen more than you'd guess, and the county charges the penalty to you anyway.

When is it worth fighting your California property assessment?

The honest answer: appealing pays off in a narrower set of situations than the contingency-fee industry wants you to believe.

Appeal when your assessed value is close to or above current market value. That happens most often in the two or three years after a sharp downturn, or if you bought at the peak and prices have since slid. Appeal too when the assessor made a flat factual error, like the wrong square footage, wrong year built, or the wrong zoning classification.

Don't bother when your Prop 13 base year value already sits well below market. Bought in 2010, assessed at $400,000 on a home now worth $900,000? Your assessment is lawfully correct. You can't appeal the Prop 13 cap itself.

A DIY appeal costs mostly time. Filing fees at California Assessment Appeals Boards run from $0 in some counties to $30 in others. ^[11] The potential savings on a $100,000 overassessment at a 1.2% effective rate is $1,200 a year. If the appeal wins and the correction applies retroactively (boards can do this within limits), the savings compound.

Contingency firms usually take 25% to 40% of one year's savings as their fee. On a $1,200-a-year reduction, that's $300 to $480 handed to someone else for work you can do yourself with the right framework. TaxFightBack's appeal kit exists to help California homeowners build and present that case without surrendering a cut of their own savings.

For Contra Costa County property tax appeals specifically, the AAB has submission procedures worth reading before you file.

Frequently asked questions

Is California's 1% property tax rate applied to market value or purchase price?

It applies to assessed value, which gets set at purchase price (fair market value at the time you acquire the home) under Proposition 13. After purchase, assessed value can rise no more than 2% a year, so it often drifts well below current market value over time. The 1% rate itself is constitutionally fixed and does not float with the market.

Why is my effective California property tax rate higher than 1%?

Proposition 13 lets local governments tax above 1% when two-thirds of voters approve a bond measure. School bonds, community college bonds, and municipal bonds layer on top of the base 1% rate. The total of all these approved levies in your tax rate area is why most California owners pay between 1.1% and 1.6% of assessed value, not a clean 1%.

How much will my property taxes increase each year in California?

Your assessed value can climb no more than 2% a year, or the prior year's California Consumer Price Index change, whichever is lower. So your base tax cannot grow faster than 2% annually, absent a change of ownership or new construction. Bond overrides shift year to year as new bonds pass or old ones expire, so your total bill can move on its own, independent of the assessed value cap.

What triggers a property tax reassessment in California?

Two events trigger a full reassessment to current market value: a change of ownership (most sales, gifts, and certain trust transfers) and completed new construction. Routine maintenance, interior renovations that add no living space, and cosmetic upgrades don't trigger it. Certain family transfers, including parent-to-child transfers of a primary residence, qualify for a partial exclusion under Proposition 19.

What is a California Decline in Value (Prop 8) reassessment?

When a property's current market value drops below its Prop 13 factored base year value, California law requires the assessor to temporarily lower the assessed value to that market value. It's called a Proposition 8, or Decline in Value, reassessment. Assessors are supposed to do it automatically, but homeowners can request a review or file a formal appeal if they think the reduction never came or wasn't large enough.

How do I appeal my California property tax assessment?

File an Application for Changed Assessment with your county's Assessment Appeals Board by the deadline on your assessment notice, usually November 30 in most counties. You'll need evidence that the assessor's value tops your property's fair market value as of January 1, typically comparable sales from around that date. Many counties push you toward an informal review with the assessor's office first; that step costs nothing and sometimes settles it before a hearing.

What is the California property tax appeal deadline?

For most California counties, the deadline to appeal is November 30 of the assessment year. Some counties set an earlier deadline of September 15. The exact date appears on your annual assessment notice. Missing it means you cannot appeal the current year's assessment; you wait for the next cycle. There are no extensions for a late filing.

What is the California Homeowners' Exemption and how much does it save?

The Homeowners' Exemption cuts a primary residence's assessed value by $7,000. At the 1% base rate, that saves exactly $70 a year. File the initial claim with your county assessor after purchase; once on file, it renews automatically as long as you keep the home as your primary residence. It's small, but there's no reason to skip it.

Do California property taxes transfer when a property is inherited?

Under Proposition 19 (effective February 16, 2021), the parent-child exclusion for inherited property is now limited. A child inheriting a parent's primary residence carries over the parent's low assessed value only for the first $1,000,000 of value above that base, and only if the child also lives in the home as a primary residence. Inherited investment or rental property no longer qualifies for the exclusion at all.

What is a Mello-Roos charge and is it part of the 1% property tax?

Mello-Roos charges are special taxes levied by Community Facilities Districts under the Mello-Roos Community Facilities Act of 1982. They are NOT part of the 1% Prop 13 property tax. They appear on your bill as flat-dollar line items and are common in newer California subdivisions. They can add $1,000 to $5,000 or more a year depending on the district, and they usually expire when the underlying bond is paid off.

When are California property taxes due?

California property taxes come in two installments. The first, covering July through December, is due November 1 and goes delinquent after December 10. The second, covering January through June, is due February 1 and goes delinquent after April 10. A 10% penalty hits right after each delinquency date. If you pay through a mortgage impound account, confirm your servicer paid on time; the penalty is yours regardless.

Can I estimate my California property taxes before buying a home?

Yes. Take the purchase price (your new assessed value), multiply by 0.01 for the base tax, then add an estimated 0.1% to 0.5% for bond overrides in that county and tax rate area. Many county assessor websites offer tax rate area lookups by address. For new developments, ask the builder for the Mello-Roos disclosure, which sellers must provide under California Civil Code Section 1102.6b.

Does California have a senior property tax exemption or freeze?

California doesn't freeze property taxes for seniors, but it runs two programs. The standard Homeowners' Exemption ($7,000 off assessed value) applies to any owner-occupant. The Proposition 19 base year value transfer lets homeowners 55 and older move their low assessed value to a replacement home anywhere in California, up to three times. Separately, the State Controller runs a property tax postponement program for low-income seniors and disabled homeowners.

Sources

1. California Constitution, Article XIII A (Proposition 13, 1978): Base property tax rate capped at 1% of full cash value; local bond overrides allowed with two-thirds voter approval; assessed value based on acquisition price
2. California State Board of Equalization, Property Taxes Law Guide: Explanation of Mello-Roos Community Facilities Districts and direct levies as non-1% additions to property tax bills
3. Lincoln Institute of Land Policy, Significant Features of the Property Tax: California effective property tax rate approximately 0.70%–0.76% of market value; national context for state comparison
4. California Revenue and Taxation Code, Sections 51, 60–68, 75 (via California Legislative Information): 2% annual assessed value cap; change of ownership and new construction as reassessment triggers; Prop 8 Decline in Value provisions; escaped assessments
5. Santa Clara County Assessor's Office, Property Tax Information: County-level tax rate area data and assessed value lookup for Santa Clara County properties
6. California State Board of Equalization, Publication 29: California Property Tax: An Overview: Supplemental assessment rules under Revenue and Taxation Code Section 75; two-installment payment schedule with November 1 and February 1 due dates
7. California State Board of Equalization, Homeowners' and Veterans' Exemptions: $7,000 assessed value reduction for Homeowners' Exemption; disabled veterans' exemption thresholds indexed annually
8. California State Board of Equalization, Proposition 19 Information: Proposition 19 parent-child exclusion rules effective February 16, 2021; base year value transfer rules for seniors 55+ effective April 1, 2021
9. California State Controller's Office, Property Tax Postponement Program: Property tax deferral program for qualifying low-income seniors and disabled homeowners
10. California State Board of Equalization, Assessment Appeals Overview: Standard November 30 appeal deadline; county Assessment Appeals Board filing process; minimal filing fees
11. San Mateo County Assessor-County Clerk-Recorder: San Mateo County property assessment data and effective tax rate ranges