California property tax appeals
Review the sourced process overview below, then get the California DIY Appeal Kit with an evidence workbook, filing controls, official links, and an editable appeal letter in one PDF. No parcel-specific comps.
How a California appeal actually works
Every statement below is cited to its primary source and shows the date we verified it. Where we could not confirm something from a primary source, we say so instead of guessing. Dataset last re-verified 2026-08-13.
Missed the main deadline? California has 5 remedies most homeowners never hear about
County pages rarely surface these. Each one is a distinct legal route with its own clock.
Two-year deemed-granted rule (the single most valuable California remedy)
Rev. & Tax. Code 1604(c): 'If the county board fails to hear evidence and fails to make a final determination on the application for reduction in assessment of property within two years of the timely filing of the application, the applicant's opinion of value as reflected on the application for reduction in assessment shall be the value upon which taxes are to be levied for the tax year or tax years covered by the application' - unless the applicant agreed in writing or on the record to an extension, or the application was consolidated with another for which an extension was granted. The subdivision does not apply 'to applications for reductions in assessments of property where the applicant has failed to provide full and complete information as required by law or where litigation is pending directly relating to the issues involved in the application.' Rev. & Tax. Code 1604(e) requires the board to notify the applicant in writing of a decision not to hold a hearing within the two-year period and to inform the applicant that the applicant's opinion of value will control. OPERATIONAL CONSEQUENCE: never sign a blanket extension request without pricing it, and always state a defensible opinion of value on the application, because that number can become the enrolled value by operation of law.
When:
primary source · verified
Claim for refund of taxes
Rev. & Tax. Code 5096 lists the refundable categories, including taxes 'Erroneously or illegally collected,' 'Illegally assessed or levied,' and 'Paid on an assessment in excess of the value of the property as determined pursuant to Section 1614 by the county assessment appeals board.' Rev. & Tax. Code 5097(a)(2) sets the general limitations period: a claim must be 'filed within four years after making the payment sought to be refunded, within one year after the mailing of notice as prescribed in Section 2635, within the period agreed to as provided in Section 532.1, or within 60 days of the date of the notice prescribed by subdivision (a) of Section 4836, whichever is later.' Where an appeal application was filed but not designated a refund claim, 5097(a)(3) gives one year after the board's final determination (or six months if the board's notice advises the applicant to file within six months). Rev. & Tax. Code 5097(b): 'An application for a reduction in an assessment filed pursuant to Section 1603 shall also constitute a sufficient claim for refund under this section if the applicant states in the application that the application is intended to constitute a claim for refund.'
When:
primary source · verified
Roll correction for a missed decline in value
Rev. & Tax. Code 4831 permits correction of incorrect roll entries. Most relevant here is 4831(c): 'Any error or omission involving the exercise of assessor value judgment that arises solely from a failure to reflect a decline in the taxable value of real property, floating homes subject to taxation pursuant to Section 229, and manufactured homes subject to taxation under Part 13 (commencing with Section 5800), as required by paragraph (2) of subdivision (a) of Section 51 shall only be corrected within ONE YEAR after the making of the assessment that is being corrected.' Non-judgment errors get four years under 4831(a)(1); audit-discovered non-judgment errors get six months after audit completion under 4831(b). This is the cleanup path when the assessor simply failed to carry a Proposition 8 reduction forward as Section 51(e) requires.
When:
primary source · verified
Automatic annual Proposition 8 review with no filing required
Rev. & Tax. Code 51(e): once a property's taxable value has been reduced under 51(a)(2), 'the value of that property shall be annually reappraised at its full cash value as defined in Section 110 until that value exceeds the value determined pursuant to paragraph (1) of subdivision (a). In no event shall the assessor condition the implementation of the preceding sentence in any year upon the filing of an assessment appeal.' Note the corollary trap flagged in BOE Publication 30: 'An application must be filed for each year you disagree with the Assessor's value, even if you have a decline in value appeal pending for a prior year.' The automatic review is the assessor's duty; it does not preserve a contested value for a later year.
When:
primary source · verified
Stipulation with the assessor (avoids a hearing)
Rev. & Tax. Code 1603(c) allows an application within 12 months following the month of notification where the applicant and assessor 'stipulate that there is an error in the assessment as the result of the exercise of the assessor's judgment in determining the full cash value of the property and a written stipulation as to the full cash value and assessed value is filed in accordance with Section 1607.' BOE Publication 30: 'If you and the Assessor reach an agreement regarding the value of your property after filing an application but prior to the hearing, the agreement should be in writing and signed by all parties, including the applicant (or applicant's relative or authorized agent), the County Assessor, and the county legal officer... which can accept or reject the stipulation. If the stipulation is rejected, a hearing will be scheduled.'
When:
primary source · verified
What evidence wins in California
Comparable SALES, on a strict statutory recency rule, and comparable ASSESSMENTS are legally irrelevant. Rev. & Tax. Code 402.5: 'When valuing property by comparison with sales of other properties, in order to be considered comparable, the sales shall be sufficiently near in time to the valuation date, and the properties sold shall be located sufficiently near the property being valued, and shall be sufficiently alike in respect to character, size, situation, usability, zoning, or other legal restriction as to use... to make it clear that the properties sold and the properties being valued are comparable in value... "Near in time to the valuation date" does not include any sale more than 90 days after the valuation date.' The valuation date for a decline-in-value appeal is the January 1 lien date of the year appealed; BOE Publication 30: 'Any comparable sales you present as evidence can have occurred before January 1, 2015, but no more than 90 days after January 1, 2015,' and 'Comparable sales dated more than 90 days after the valuation date cannot be admitted into evidence.' Pub 30 also confirms the three approaches ('comparable sales of similar property approach; replacement cost less depreciation approach; and income approach') and that 'In most residential appeals, the most reliable type of evidence to support your opinion of "fair market value" is the sale of properties similar to yours.' Evidence is hearing-bound: 'The only evidence that an appeals board can consider is the evidence that you and the Assessor present at your assessment appeal hearing. The board may not consider any information attached to your application or any discussions with the Assessor's office or others, unless you also present such evidence at your appeal hearing.' 'Depositions are not admissible and may not be considered for any purpose by the appeals board.' UNIFORMITY IS NOT A CAUSE OF ACTION. BOE Publication 30's list of what appeals boards CANNOT do includes: 'Reduce your property's assessed value simply because you are paying more taxes than your neighbor.' This follows structurally from Proposition 13: because each property carries its own base year value fixed at its own acquisition date and escalated at up to 2 percent per year, two physically identical neighboring homes lawfully carry wildly different assessed values. The Supreme Court upheld exactly this disparity against an equal protection challenge in Nordlinger v. Hahn, 505 U.S. 1 (1992). Consequence for product design: an assessment-comparison engine, which is the core of a Texas or Illinois appeal product, produces legally worthless output in California. The only winning theory is that CURRENT MARKET VALUE on the lien date is below the factored base year value.
primary source · verified 2026-08-12
The appeal ladder, in California's own terms
- 1
County Assessor - informal decline-in-value (Proposition 8) review request
Deadline: No statutory filing deadline for the informal request itself, and critically NO APPLICATION IS REQUIRED AT ALL for the assessor's annual decline-in-value review. Rev. & Tax. Code 51(e) verbatim: 'for each lien date after the first lien date for which the taxable value of property is reduced pursuant to paragraph (2) of subdivision (a), the value of that property shall be annually reappraised at its full cash value as defined in Section 110 until that value exceeds the value determined pursuant to paragraph (1) of subdivision (a). In no event shall the assessor condition the implementation of the preceding sentence in any year upon the filing of an assessment appeal.' Practically, the informal request must be made early enough to preserve the formal appeal: Rev. & Tax. Code 1603(d) lets a county board of supervisors adopt a resolution allowing an application to be filed within 60 days of the mailing of the assessor's response to a reassessment request, but ONLY if (among other conditions) 'The request for reassessment was made on or before the immediately preceding March 15,' the assessor's response 'was mailed on or after September 1 of the calendar year in which the request for reassessment was made,' and 'The application for changed assessment is filed on or before December 31 of the year in which the request for reassessment was filed.' Where the county has not adopted that resolution, the informal request does NOT extend the regular 1603(b) filing period.
Clock starts: Lien date of January 1 of the assessment year; for the 1603(d) extension, the mailing of the assessor's written response to a reassessment request made on or before March 15
Cal. Rev. & Tax. Code 51(a)(2), 51(e); Cal. Rev. & Tax. Code 1603(d) · primary source · verified 2026-08-12
Form: No statewide statutory form. Rev. & Tax. Code 1603(d)(1) contemplates that a request for reassessment be 'submitted in writing to the assessor in the form prescribed by the State Board of Equalization and includes all information that is prescribed by the State Board of Equalization.' BOE Publication 30 instructs: 'Talk to Your County Assessor First.' Most counties publish a local 'Decline-in-Value Review' / 'Proposition 8 Review' request form; it is not the appeal application and does not preserve appeal rights by itself. official form
primary source · verified 2026-08-12
Fee: none
No fee is authorized; the informal review is not a statutory adjudicative proceeding and Rev. & Tax. Code 51(e) forbids conditioning the annual decline-in-value reappraisal on any filing. · primary source · verified 2026-08-12
- 2
County Assessment Appeals Board (or the county Board of Supervisors sitting as the county board of equalization)
Deadline: COUNTY-SPECIFIC, and the split is the opposite of the common assumption: most California counties are November 30, not September 15. Rev. & Tax. Code 1603(b)(1): 'The application shall be filed within the time period from July 2 to September 15, inclusive. An application that is mailed and postmarked September 15 or earlier within that period shall be deemed to have been filed within the time period beginning July 2 and continuing through and including September 15.' Rev. & Tax. Code 1603(b)(3) extends that: 'the last day of the filing period shall be extended to November 30 in the case of an assessee or party affected with respect to all property located in a county where the county assessor DOES NOT provide, by August 1, a notice, as described in Section 619, to all assessees of real property on the local secured roll.' So September 15 applies only where the assessor mails value notices to ALL secured-roll owners by August 1; otherwise November 30. The assessor must tell the clerk by April 1 which it will be, and the clerk certifies it to the BOE, which 'shall maintain a statewide listing of the time period to file an application in each county' (1603(b)(3)(A)-(C)). FOR 2026, per BOE Letter To Assessors No. 2026/023 (June 2, 2026): 'The regular appeals filing period in each county will begin on July 2, 2026, and will end on September 15, 2026, for those counties where the Assessor mails assessment notices to all taxpayers with property on the secured roll by August 1, 2026. For counties where assessment notices are not mailed by August 1, 2026, the filing period is extended to November 30, 2026.' MAJOR-COUNTY EXAMPLES FOR 2026 (from the LTA table): Los Angeles = November 30; Orange = November 30; San Diego = November 30; Riverside = November 30; San Bernardino = November 30; Contra Costa = November 30; San Mateo = November 30; Santa Clara = SEPTEMBER 15; Alameda = SEPTEMBER 15; San Francisco = SEPTEMBER 15; Ventura = SEPTEMBER 15; San Luis Obispo = SEPTEMBER 15. In 2026 both dates fall on business days (September 15, 2026 is a Tuesday; November 30, 2026 is a Monday), so no roll applies. TWO SEPARATE ESCAPE HATCHES: (i) Rev. & Tax. Code 1603(b)(2) - 'if the taxpayer does not receive the notice of assessment described in Section 619 at least 15 calendar days prior to the deadline to file the application described in this subdivision, the party affected, or his or her agent, may file an application within 60 days of receipt of the notice of assessment or within 60 days of the mailing of the tax bill, whichever is earlier, along with an affidavit declaring under penalty of perjury that the notice was not timely received'; (ii) Rev. & Tax. Code 1603(c) - a stipulated-error application may be filed 'within 12 months following the month in which the assessee is notified of the assessment' where the assessor stipulates to a judgment error and a written stipulation is filed under Section 1607.
Clock starts: Opening of the regular equalization period on July 2 of the assessment year (fixed), with the closing date determined by whether the assessor mailed Section 619 notices to all secured-roll assessees by August 1
Cal. Rev. & Tax. Code 1603(b)(1)-(4), 1603(c); Cal. Rev. & Tax. Code 619 · primary source · verified 2026-08-12
Form: BOE-305-AH — Assessment Appeal Application. NOTE THE RENAME - the BOE states: 'Prior to January 21, 2015, BOE Form 305-AH, Assessment Appeal Application, was previously named Application for Changed Assessment. Please be sure to use the current form when obtaining an Application from the Clerk of the Board in the county where the property is located.' The form is prescribed by the State Board of Equalization (Rev. & Tax. Code 1603(a): 'The form for the application shall be prescribed by the State Board of Equalization') but is ISSUED AND ACCEPTED COUNTY BY COUNTY. BOE Publication 30: 'To be valid, all appeals should be filed on the official Assessment Appeal Application form used for the county where your property is located.' Rev. & Tax. Code 1603(g) permits counties to accept electronically filed applications with an authenticated electronic signature. official form
primary source · verified 2026-08-12
Fee: SET LOCALLY. No filing fee is imposed by Rev. & Tax. Code 1603; most California counties charge $0. LOS ANGELES COUNTY CHARGES A FEE: 'On August 31, 2021, the Board of Supervisors approved an amendment to LA County Code Title 2 establishing a $46 non-refundable filing fee for assessment appeal applications. Effective October 1, 2021, the fee must be paid when submitting an application.' LA provides a hardship waiver: 'If paying the fee would cause undue financial hardship, you may request a fee waiver. Waiver forms must be submitted online, in the mail, or in-person along with your application.' (set_locally)
Cal. Rev. & Tax. Code 1603 (no state fee); Los Angeles County Code Title 2 (as amended August 31, 2021, effective October 1, 2021) · primary source · verified 2026-08-12
- 3
California Superior Court - action for refund of property taxes
Deadline: Two-step and easy to blow. First, administrative remedies must be exhausted before the assessment appeals board (Rev. & Tax. Code 5142(a): 'No action shall be commenced or maintained under this article, except under Section 5148, unless a claim for refund has first been filed pursuant to Article 1 (commencing with Section 5096). No recovery shall be allowed in any refund action upon any ground not specified in the refund claim.'). Second, the suit deadline: Rev. & Tax. Code 5141(a) - 'An action brought under this article, except an action brought under Section 5148, shall be commenced within six months from and after the date that the board of supervisors or city council rejects a claim for refund in whole or in part.' Rev. & Tax. Code 5141(b): if no notice of action is mailed within six months after the claim is filed, 'the claimant may, prior to mailing of notice by the board of supervisors or city council of its action on the claim, consider the claim rejected and bring an action under this article.' Rev. & Tax. Code 5141(c): where the appeal application itself was designated a refund claim, 'the claim for refund shall be deemed denied on the date the final installment of the taxes extended on such assessment becomes delinquent or on the date the equalization board makes its final determination on the application, whichever is later.' BOE Publication 30 restates it: 'If you wish to appeal the appeal board's decision, you must first file a claim for refund with the Board of Supervisors... You must file within six months of the date your claim for refund was denied by the Board of Supervisors.' PLANNING POINT from Pub 30: 'If you file an action in superior court, you will need the "Written Findings of Facts"... and a copy of the hearing transcript as evidence for the court to consider' - findings of fact must be REQUESTED at the appeals board stage under Rev. & Tax. Code 1611.5 or the right is waived (Rev. & Tax. Code 1603(e)).
Clock starts: Rejection of the claim for refund by the county board of supervisors (or deemed rejection under 5141(b)-(c))
Cal. Rev. & Tax. Code 5140, 5141, 5142, 5096, 5097; Cal. Rev. & Tax. Code 1611.5 · primary source · verified 2026-08-12
Form: No prescribed state form; a civil complaint for refund of property taxes is filed in the superior court of the county. The predicate refund claim may be made on the appeal application itself - Rev. & Tax. Code 1604(b)(1): 'An application for a reduction in an assessment filed pursuant to Section 1603 shall also constitute a sufficient claim for refund, if the applicant states in the application that the application is also intended to constitute a claim for refund pursuant to the provisions of Section 5097.' BOE Publication 30 warns: 'Do not file a claim for refund with the Board of Supervisors if you made your appeal application a claim for refund.' official form
primary source · verified 2026-08-12
Not confirmed from a primary source: The Government Code civil filing fee schedule was not fetched in this session; do not quote a dollar amount. Check the official page before relying on this.
Who has to prove what
Preponderance of the evidence in an administrative hearing; the Section 167 presumption is a 'rebuttable presumption affecting the burden of proof,' which under California evidence law shifts the burden of proof (not merely production) to the assessor.
primary source · verified 2026-08-12
When values are set
ACQUISITION-VALUE SYSTEM, NOT A CYCLICAL REVALUATION SYSTEM. Under Cal. Const. art. XIII A, sec. 2(a) (Proposition 13, adopted June 6, 1978), "full cash value" means 'the county assessor's valuation of real property as shown on the 1975-76 tax bill under "full cash value" or, thereafter, the appraised value of real property when purchased, newly constructed, or a change in ownership has occurred after the 1975 assessment.' The base year value is then escalated annually by an inflation factor capped at 2 percent - Rev. & Tax. Code 51(a)(1)(D): 'In no event shall the percentage increase for any assessment year determined pursuant to subparagraph (A), (B), or (C) exceed 2 percent of the prior year's value.' The taxable value each lien date is the LESSER of (1) the factored base year value or (2) 'Its full cash value, as defined in Section 110, as of the lien date, taking into account reductions in value due to damage, destruction, depreciation, obsolescence, removal of property, or other factors causing a decline in value' (Rev. & Tax. Code 51(a)(2) - the Proposition 8 decline-in-value branch). There is no general annual reappraisal: Rev. & Tax. Code 51(e) - 'Nothing in this section shall be construed to require the assessor to make an annual reappraisal of all assessable property.' Once a property has been reduced under 51(a)(2), however, the assessor MUST reappraise it annually at full cash value until market value again exceeds the factored base year value, and may not condition that on an appeal being filed. Ad valorem rate is capped at 1 percent of full cash value by Cal. Const. art. XIII A, sec. 1(a), exclusive of voter-approved bonded indebtedness.
primary source · verified 2026-08-12
How counties differ
The filing deadline is the single largest county variable and it is binary: September 15 or November 30, recertified annually by each county clerk and published by the BOE. For 2026 the authoritative list is BOE Letter To Assessors No. 2026/023 (June 2, 2026). Counties on SEPTEMBER 15 for 2026: Alameda, Alpine, Inyo, Kings, Mono, Placer, San Francisco, San Luis Obispo, Santa Clara, Sierra, Ventura. All remaining counties, including Los Angeles, Orange, San Diego, Riverside, San Bernardino, Contra Costa, San Mateo, Sacramento, Fresno, Kern, Santa Barbara, Santa Cruz, Sonoma and Marin, are on NOVEMBER 30. This list must be re-pulled every year - a county can switch by electing to mail Section 619 notices to all secured-roll owners by August 1. Other county-level variables: whether a filing fee is charged (Los Angeles $46; most counties none); whether the board of supervisors has adopted the Rev. & Tax. Code 1603(d) resolution extending the deadline to 60 days after the assessor's response to a reassessment request; whether electronic filing with electronic signature is accepted under 1603(g); and whether the county uses assessment appeals boards or hearing officers (Rev. & Tax. Code 1636 et seq.).
California appeal deadline
Deadlines varyCalifornia deadlines are set locally.
The deadline is almost always printed on the assessment notice your local assessor mails you. Use that date, it is the one that counts.
Are you missing a California exemption?
Exemptions cut your bill before any appeal even starts, and most homeowners never claim all the ones they qualify for. Answer four questions:
Is your California home over-assessed?
The whole appeal hinges on one comparison: your assessed value (from your tax notice) versus your home's market value (what it would sell for today). Put both in:
How to find your home's real market value (free) →
- Pull free estimates. Look up your address on Zillow (“Zestimate”) and Redfin (“Redfin Estimate”). Average them, algorithms run high or low, so two beats one.
- Find 3-5 real comparable sales. Same neighborhood, similar size, beds/baths, age, and condition, sold in the last 6-12 months. Recent sales (not listings) are the strongest evidence a board will accept.
- Adjust for differences. Knock value off comps that are bigger or renovated; add for ones that are smaller or dated, so you're comparing like-for-like.
- Compare to your assessment. If your assessed value sits clearly above that adjusted market figure, you have grounds to appeal.
One catch: some states assess at a fraction of market value (an “assessment ratio”). If your notice shows a ratio or an “equalized” value, compare your implied full value to market, not the raw assessed number.
How property tax appeals generally work
Most states follow the same basic path: your local assessor mails an assessment notice with a value and a deadline; you file an appeal (often called a protest, grievance, or petition) before that deadline; you present comparable sales of similar homes; and a local board reviews the evidence and can lower your value.
The exact form, deadline, and board can vary by county. Use the current assessment notice and the official sources linked above to confirm the controlling local requirements. The paid kit organizes that verification, the evidence, the filing steps, and your editable letter in one place.
Want to see the depth we build per state? Take a look at our Texas, Florida, and Georgia guides.