California Property Tax Appeal Guide | Property Tax Edge
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California

West · 58 counties

Complete property tax appeal guide for California homeowners — rates, deadlines, exemptions, and step-by-step appeal instructions.

California State Board of EqualizationModerate to Appeal
0.70%
Effective Tax Rate
Rank #32 nationally
100%
Assessment Ratio
100% of purchase price (Prop 13)
$734,700
Median Home Value
latest Census/ACS estimate
$5,124
Median Annual Tax
Per year
1

Prop 13 caps annual increases at 2% — most homeowners pay well below market-rate taxes

2

Appeals most effective within 1–2 years of purchase or major improvement

3

58 counties each have their own Assessment Appeals Board

Appeal Deadline

July 2 – November 30 (most counties); September 15 in 11 counties (Alameda, Alpine, Inyo, Kings, Mono, Placer, San Francisco, San Luis Obispo, Santa Clara, Sierra, Ventura)

Eleven counties close on September 15, not ten — Placer is the one most often left off the list, and a Placer owner told 'November 30' has six weeks of runway that does not exist. These counties mail value notices to all owners, which is what shortens the window. November 30, 2026 falls on a Monday, so no weekend rollover applies. Confirm against the BOE's annual Letter to Assessors rather than the undated filing-periods PDF, which still serves the 2024 table.

Verified August 2026 against the official source · official source · always confirm the current date with your county

Understanding California's Assessment Ratio

100%
100% of purchase price (Prop 13)

California assesses at 100% of market value, so your assessed value should equal what your property is worth on the open market.

This makes appeals straightforward: if comparable homes in your area sold for less than your assessed value, you have grounds for an appeal.

📌 Proposition 13: Assessed value capped at purchase price + 2% annual increase; reassessed only on sale or new construction

How to Appeal Your Property Tax in California

1

Review your annual assessment notice

2

File with the County Assessment Appeals Board July 2 – November 30 — but by September 15 in Alameda, Alpine, Inyo, Kings, Mono, Placer, San Francisco, San Luis Obispo, Santa Clara, Sierra and Ventura

3

Attend informal conference with assessor (optional)

4

Formal hearing before the Assessment Appeals Board

5

Further appeal to Superior Court

Appeal Body
County Assessment Appeals Board → Superior Court

Exemptions & Relief Programs

Homestead Exemption
$7,000 assessed value reduction (Homeowners Exemption)
Senior / Disabled Exemption
Prop 19: base-year transfer for 55+ moving to equal/lesser-value home
Proposition 13
Assessed value capped at purchase price + 2% annual increase; reassessed only on sale or new construction

Key Statutes & Legal References

§
Cal. Rev. & Tax. Code §110.1 (Prop 13 base year)
§
Cal. Rev. & Tax. Code §51 (2% annual cap)
§
Cal. Rev. & Tax. Code §1603 (appeal filing)
§
Proposition 19 (2021 base-year transfers)

California Property Tax Code

Governing Code
California Revenue & Taxation Code
Assessment Authority
County Assessor
Appeal Board
Assessment Appeals Board (AAB)
Assessment Cycle
Annual (base year value + 2% max increase under Prop 13)

Key Statutes

R&TC §51
Base Year Value (Prop 13)
Establishes the base year value system — property is assessed at 1975-76 value or purchase price, with maximum 2% annual increase.
R&TC §68
Change in Ownership
Defines what constitutes a change in ownership triggering reassessment to current market value.
R&TC §69.5
Senior Transfer (Prop 19)
Allows homeowners 55+ to transfer their base year value to a replacement home anywhere in California.
R&TC §218
Homeowners' Exemption
Provides a $7,000 exemption from assessed value for owner-occupied primary residences.

Major Exemptions

Homeowners' Exemption
Owner-occupied primary residence
$7,000 assessed value
Disabled Veterans' Exemption
Qualifying disabled veterans
$100,000–$150,000 assessed value
Senior Transfer (Prop 19)
Age 55+, primary residence
Base year value transfer
Official Code

California Appeal Tools

Use these tools to build your appeal case for California:

Over-Assessment Calculator
County Appeal Guides
Jurisdiction Intelligence
CAD Interactive Map
Sales Comparables Tool
Deadline Manager

Quick California Calculator

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Assessment ratio: 100% · Rate: 0.7%

Quick Links

Over-Assessment Calculator
Find a Consultant
Deadline Manager
Community Forum
Moderate to Appeal
Prop 13 limits reassessment; appeals most effective on new purchases or improvements

Taxing Authority

County Assessor
Assessment Frequency
On Sale/Improvement

Ready to Appeal Your California Property Tax?

Use our free tools to calculate your potential savings, find a local consultant, and manage your appeal deadlines.

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California's assessment ratio study

How closely California assessors' values actually track real sale prices — and whether you can use that in an appeal.

No usable published studyLatest study: 2025

Assessment Practices Survey (NOT a sales-ratio study)

California offers no ratio-based appeal — identical neighbours lawfully carry different assessments under Prop 13. An Assessment Appeals Board application must argue either that the factored base-year value was computed wrongly, or that current market value has fallen below it (a Prop 8 decline-in-value claim).

Official California dataCompare all 50 states + DC

Supplemental, Escape & Corrected Bills in California

California is the archetypal supplemental-assessment state: buying or building triggers one or two extra prorated supplemental bills on top of the annual bill, each with its own 60-day appeal clock that usually starts at the assessor's NOTICE (not the later tax bill) — except in Los Angeles County and other §1605(c) counties where it runs from the bill. Escape assessments can reach back 4 years (8 for unrecorded ownership changes/penalties, unlimited for fraud), and factual errors can be fixed via assessor roll corrections or recovered through a §5097 refund claim within 4 years of payment.

Supplemental assessment (change in ownership / completed new construction)

Change in ownership or completion of new construction after the Jan 1 lien date. The assessor first mails a Notice of Supplemental Assessment (R&T §75.31); the tax collector mails the supplemental tax BILL weeks or months later. The notice and the bill are distinct documents — in most counties the appeal clock runs from the NOTICE, not the bill.

Appeal window: 60 days from the mailing date printed on the Notice of Supplemental Assessment or its postmark, whichever is later. EXCEPTION: in counties whose board of supervisors adopted R&T §1605(c), and in Los Angeles County, the 60 days runs from the mailing date printed on the supplemental TAX BILL (or its postmark, whichever is later). If the notice was not received at least 15 days before the deadline, the owner may file within 60 days of the tax bill's mailing/postmark with an affidavit of non-receipt.60 days

Escape assessment

Property or value that escaped assessment or was underassessed for a prior year — e.g. unreported/unrecorded change in ownership, unpermitted or unreported new construction, business personal property audit findings, or exemption incorrectly allowed.

Appeal window: 60 days from the date of mailing of the notice of enrollment of the escape assessment (R&T §1605(b)); escape assessments are excluded from the regular assessment-period filing window. In §1605(c) counties and Los Angeles County, 60 days from the mailing date printed on the tax bill or postmark, whichever is later.60 days

Roll corrections (base-year value and clerical corrections)

Assessor-discovered errors. §51.5: errors in a base year value NOT involving the assessor's judgment as to value (clerical, factual) may be corrected in ANY year the error is discovered; errors involving value judgment may only be corrected within 4 years after July 1 of the assessment year the base value was first established. §4831: other roll entry errors not involving value judgment correctable within 4 years after the assessment was made (1 year for certain tax-collector errors).

Appeal window: If a correction INCREASES the assessment, it is enrolled and noticed as an escape assessment, giving the owner the standard 60-day appeal window from the notice (or bill in §1605(c)/LA counties). Downward corrections generate a corrected bill or refund; the owner may also appeal a §51.5 base-year value determination within the normal appeal periods.60 days

Property tax refund claim

Taxes paid that were erroneously or illegally collected, or overpaid due to roll corrections, cancellations, or a successful assessment reduction.

Appeal window: Claim must be filed within 4 years after making the payment, or within 1 year after the mailing of a notice of overpayment by the tax collector/auditor, or within the period agreed to in a written extension — whichever is later. A timely assessment appeal application can be designated as a claim for refund.

Full details & sources →Got one of these bills? Track its deadline →
AI Evidence Packet · $49

Build your California appeal evidence packet

Our AI assembles a professional evidence packet — cover letter, comparable-sales analysis, assessment ratio check, hearing script, and your state's filing instructions. $49 one-time, no subscription, no percentage of your savings. You file it with your county; we don't file or represent you.

We prepare the evidence — you submit it. The $49 is charged when the packet is generated, not when an appeal succeeds. See a sample packet.

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California property tax appeals — frequently asked questions

When is the property tax appeal deadline in California?+

In California, the appeal window is July 2 – November 30 (most counties); September 15 in 11 counties (Alameda, Alpine, Inyo, Kings, Mono, Placer, San Francisco, San Luis Obispo, Santa Clara, Sierra, Ventura). Eleven counties close on September 15, not ten — Placer is the one most often left off the list, and a Placer owner told 'November 30' has six weeks of runway that does not exist. These counties mail value notices to all owners, which is what shortens the window. November 30, 2026 falls on a Monday, so no weekend rollover applies. Confirm against the BOE's annual Letter to Assessors rather than the undated filing-periods PDF, which still serves the 2024 table. Always confirm the exact date with your local county assessor or appeal board, as it can vary by county.

How do I appeal my property tax assessment in California?+

The general process: 1) Review your annual assessment notice; 2) File with the County Assessment Appeals Board July 2 – November 30 — but by September 15 in Alameda, Alpine, Inyo, Kings, Mono, Placer, San Francisco, San Luis Obispo, Santa Clara, Sierra and Ventura; 3) Attend informal conference with assessor (optional); 4) Formal hearing before the Assessment Appeals Board; 5) Further appeal to Superior Court. Appeals are heard by the County Assessment Appeals Board → Superior Court.

What is the average property tax rate in California?+

California's effective property tax rate is about 0.7% of value — roughly $5,124 per year on the state's median home value of $734,700. Assessments are made at 100% of purchase price (Prop 13).

What exemptions can lower my property tax in California?+

Common relief includes the homestead exemption ($7,000 assessed value reduction (Homeowners Exemption)) and senior relief (Prop 19: base-year transfer for 55+ moving to equal/lesser-value home). Eligibility and amounts vary — check with California State Board of Equalization.

Does California cap how much property taxes can increase?+

Yes. Under Proposition 13: Assessed value capped at purchase price + 2% annual increase; reassessed only on sale or new construction

Is it worth appealing my property taxes in California?+

If your assessed value is higher than what your home would realistically sell for, an appeal can lower your bill — often for the life of the assessment. Use the free over-assessment calculator to estimate your potential savings before you file.