Generate a California Agricultural Use Valuation Appeal demand letter. Challenge Williamson Act and farmland assessments with state-specific citations and deadlines.
Generate My Letter — $19If your California farmland or ranch is enrolled in a Williamson Act contract or otherwise qualifies for agricultural use valuation, the county assessor must value it based on its restricted agricultural use, not its potential market value for development. When assessors ignore these rules, property owners can pay thousands more in property taxes than the law allows. California's Revenue and Taxation Code provides a clear path to challenge an incorrect agricultural assessment, but the deadlines are short and the procedural rules are strict. A well-drafted appeal letter or Application for Changed Assessment, citing the correct statutes and valuation methodology, is often the fastest way to get the assessor's attention and secure a corrected bill or refund.
California protects agricultural land through several overlapping laws. The Williamson Act (California Land Conservation Act of 1965), codified at Government Code §§ 51200-51297.4 and implemented in Revenue and Taxation Code §§ 421-430.5, requires assessors to value enrolled land based on its agricultural income-producing capacity using a capitalization-of-income method, not comparable sales of unrestricted parcels. Land under a Farmland Security Zone contract receives an even deeper assessment reduction—valued at 65% of the Williamson Act value or Proposition 13 base, whichever is lower (Gov. Code § 51296). Separately, Proposition 13 (Cal. Const. art. XIIIA) caps annual assessment increases at 2% absent a change in ownership or new construction, and agricultural improvements such as living orchards and vineyards are subject to specific valuation rules under Rev. & Tax. Code § 423. Assessors must apply state-prescribed capitalization rates published annually by the State Board of Equalization. Common assessor errors include using market-based comparables instead of the restricted income approach, failing to apply the Farmland Security Zone discount, misclassifying non-living improvements, double-counting trees and vines as both land and improvements, and improperly triggering reassessment on intra-family transfers that qualify for exclusion under Rev. & Tax. Code §§ 62 and 63.1. Property owners challenge these errors by filing an Application for Changed Assessment (Form BOE-305-AH) with the county Assessment Appeals Board or, in some counties, a Board of Supervisors sitting as the Board of Equalization. The appeal must identify the property, state the owner's opinion of value, and specify the basis for the appeal. Informal review by the assessor is also available and often resolves issues without a hearing.
A demand letter to the county assessor serves two purposes in California: it opens an informal review channel before the formal appeals deadline, and it creates a documented record showing you raised specific legal objections. An effective letter identifies the parcel by APN, states the assessed value and your opinion of correct value, and cites the controlling authority—typically Rev. & Tax. Code § 423 for the income-capitalization method, the Williamson Act contract recording information, and the State Board of Equalization's current capitalization rate factors. The letter should attach supporting evidence: the recorded Land Conservation Contract, recent crop and lease income data, USDA soil classification, and any comparable restricted-use valuations. Request a specific remedy: a corrected assessment roll entry, a refund of overpaid taxes under Rev. & Tax. Code § 5096 et seq., and confirmation in writing. State clearly that you are preserving your right to file a formal Application for Changed Assessment if the matter is not resolved before the filing deadline. Many California assessors will stipulate to a corrected value when presented with documented errors, avoiding the expense of an Appeals Board hearing. Send the letter by certified mail to both the Assessor and the Clerk of the Assessment Appeals Board, and keep proof of delivery. If the assessor refuses or does not respond before your county's filing deadline, file the formal application immediately—the demand letter does not extend statutory deadlines.
California assessment appeals are filed with the county Assessment Appeals Board, not in court. The standard filing window is July 2 through September 15 in counties that have adopted the earlier deadline, or July 2 through November 30 in all other counties; supplemental and escape assessment appeals must be filed within 60 days of the notice. Filing fees vary by county, typically $30-$60 per application. Hearings are evidentiary and the property owner bears the burden of proof, except on owner-occupied single-family residences. After exhausting the Appeals Board process, refund actions may be filed in Superior Court under Rev. & Tax. Code § 5140 within six months of the Board's final decision. Small claims court (limit $12,500) generally cannot be used for property tax disputes against the county.
Property tax in California is governed by the California Revenue and Taxation Code (property taxation), implementing Article XIII A of the CA Constitution (Proposition 13) (Cal. Const. art. XIII A (Prop 13); Cal. Rev. & Tax. Code §§ 110, 619, 1603, 3691 et seq.). Assessment cycle: Annual lien date of January 1 each year; under Prop 13 the base-year (purchase-price) value is set at acquisition and capped at a maximum 2% inflationary increase per year unless there is a change in ownership or new construction that triggers reassessment. Assessed value: 100% of full cash value (fair market value). Cal. Rev. & Tax. Code § 401 requires assessment at full value. Under Prop 13 the taxable value is the factored base-year value (acquisition value + 2%/yr max), not annual market value.
County Assessor (assessment) and county Assessment Appeals Board / county Board of Equalization (appeals) at the local level; the California State Board of Equalization (BOE) provides statewide oversight, guidance, and property tax rules. The window to act is short — regular assessment appeals filing period runs July 2 through either September 15 or November 30 depending on the county. As of 2025, 11 counties (incl. Alameda, San Francisco, Santa Clara, Ventura) use September 15; the other 47 counties use November 30. Supplemental and escape assessments must be appealed within 60 days of the notice/tax bill mailing date. No extensions.
A recent change to watch: Proposition 19 (passed Nov. 2020; base-year-value transfers effective April 1, 2021) lets homeowners 55+, severely and permanently disabled, or victims of wildfire/disaster transfer their Prop 13 base-year value to a replacement home anywhere in California up to three times, while narrowing the parent-child reassessment exclusion largely to a primary residence the transferee occupies.
How your value is assessed: 100% of full cash value (fair market value). Cal. Rev. & Tax. Code § 401 requires assessment at full value. Under Prop 13 the taxable value is the factored base-year value (acquisition value + 2%/yr max), not annual market value.
Grounds you can raise: Assessor's full cash value (fair market value) exceeds actual market value; incorrect base-year value; decline-in-value (Prop 8) below the factored Prop 13 base value; improper change-in-ownership or new-construction reassessment; supplemental or escape assessment disputes.
Appeal deadline: Regular assessment appeals filing period runs July 2 through either September 15 or November 30 depending on the county. As of 2025, 11 counties (incl. Alameda, San Francisco, Santa Clara, Ventura) use September 15; the other 47 counties use November 30. Supplemental and escape assessments must be appealed within 60 days of the notice/tax bill mailing date. No extensions.
First-level appeal: Application for Changed Assessment filed with the clerk of the county Assessment Appeals Board (AAB), or in smaller counties the county Board of Equalization sitting as the appeals board (Cal. Rev. & Tax. Code § 1603).
Next-level appeal: After exhausting the administrative appeal before the Assessment Appeals Board, the taxpayer's further remedy is a refund action in California Superior Court (judicial review), typically after paying the tax and filing a refund claim; there is no intermediate second administrative appeal body.
Evidence that works: Comparable sales, appraisals, income/expense data (income approach), cost data, and evidence of fair market value as of the valuation date; the § 110(b) rebuttable presumption is that full cash value equals actual purchase price in an open-market transaction.
Exemptions to claim: Homeowners' Exemption: $7,000 reduction in assessed value of an owner-occupied principal residence. Veterans' Exemption: up to $4,000. Disabled Veterans' Exemption: roughly $161,083 basic / $241,627 low-income for 2026 (inflation-adjusted). Property Tax Postponement (age 62+, blind, or disabled) and Prop 19 base-year-value transfers for homeowners 55+, severely disabled, or disaster victims. Prop 13 caps assessed-value growth at 2%/yr.
The hearing: In-person (and increasingly virtual) evidentiary hearing before the county Assessment Appeals Board; taxpayer and assessor present evidence and testimony, and the board renders a value determination.
First, application for Changed Assessment filed with the clerk of the county Assessment Appeals Board (AAB), or in smaller counties the county Board of Equalization sitting as the appeals board (Cal. Rev. & Tax. Code § 1603).
If that fails, after exhausting the administrative appeal before the Assessment Appeals Board, the taxpayer's further remedy is a refund action in California Superior Court (judicial review), typically after paying the tax and filing a refund claim; there is no intermediate second administrative appeal body.
Mind the deadline: regular assessment appeals filing period runs July 2 through either September 15 or November 30 depending on the county. As of 2025, 11 counties (incl. Alameda, San Francisco, Santa Clara, Ventura) use September 15; the other 47 counties use November 30. Supplemental and escape assessments must be appealed within 60 days of the notice/tax bill mailing date. No extensions.
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