Browse source-reviewed property tax appeal guides for California. County deadlines, filing methods, and available records can differ by county and tax year.
Each published guide identifies the public sources used for its deadline and filing summary. Confirm current requirements with the official filing authority before submitting anything.
Alameda County: 2026 deadline guidance is 2026 regular assessment appeals: July 2 through September 15, 2026. Guide: https://fairpath.app/property-tax-appeal/california/alameda-county
Los Angeles County: 2026 deadline guidance is November 30, 2026 for regular assessment appeals. Guide: https://fairpath.app/property-tax-appeal/california/los-angeles-county
Orange County: 2026 deadline guidance is July 2 through November 30, 2026 for regular assessments. Guide: https://fairpath.app/property-tax-appeal/california/orange-county
San Diego County: 2026 deadline guidance is July 2 through November 30, 2026 for regular assessments. Guide: https://fairpath.app/property-tax-appeal/california/san-diego-county
Santa Clara County: 2026 deadline guidance is 2026 regular assessment appeals: July 2 through September 15, 2026. Guide: https://fairpath.app/property-tax-appeal/california/santa-clara-county
Stanislaus County: 2026 deadline guidance is 2026 regular assessment appeals: July 2 through November 30, 2026. Guide: https://fairpath.app/property-tax-appeal/california/stanislaus-county
Source: Alameda County Clerk of the Board, 2026-2027 Assessment Appeal Application Notice, https://acgov.org/clerk/forms/NOTICE2026-revised.pdf. Reviewed 2026-07-16.
Source: Alameda County Clerk of the Board, Assessment Appeals, https://acgov.org/clerk/assessment.htm. Reviewed 2026-07-16.
Source: Alameda County Clerk-Administrator, 2026 Assessment Appeals Board Instruction Booklet, https://acgov.org/clerk/forms/AABBOOK2026_Final-Final.pdf. Reviewed 2026-07-16.
Source: California State Board of Equalization, Property Tax Assessment Appeals, https://www.boe.ca.gov/proptaxes/asmappeal.htm. Reviewed 2026-07-16.
Source: County of Alameda, Online Assessment Appeal Application, https://aab.alamedacountyca.gov/. Reviewed 2026-07-16.
Source: County of Santa Clara Office of the Clerk of the Board, Appeal Your Property Taxes, https://cob.santaclaracounty.gov/appeal-your-property-taxes. Reviewed 2026-07-16.
Source: County of Santa Clara Office of the Clerk of the Board, Assessment Appeal Dates and Deadlines, https://cob.santaclaracounty.gov/appeal-your-property-taxes/assessment-appeal-dates-and-deadlines. Reviewed 2026-07-16.
Source: County of Santa Clara Office of the Clerk of the Board, Assessment Appeals Hearing Preparation, https://cob.santaclaracounty.gov/appeal-your-property-taxes/assessment-appeals-hearing-preparation. Reviewed 2026-07-16.
Source: County of Santa Clara Office of the Clerk of the Board, Value Hearing Officers, https://cob.santaclaracounty.gov/appeal-your-property-taxes/resources/assessment-appeals-board/value-hearing-officers. Reviewed 2026-07-16.
Source: Los Angeles County Assessment Appeals Board, Assessment Appeals Board Online Services, https://lacaab.lacounty.gov/Home.aspx?cm_type=gnav. Reviewed 2026-07-16.
Source: Los Angeles County Executive Office, Assessment Appeals Services, https://bos.lacounty.gov/Services/Assessment-Appeals. Reviewed 2026-07-16.
Source: Orange County Assessor, Assessment Appeals FAQ, https://www.ocassessor.gov/faqs/assessment-appeals. Reviewed 2026-07-16.
Source: Orange County Clerk of the Board, Appeal Your Property Value, https://cob.oc.gov/appeal-your-property-value. Reviewed 2026-07-16.
Source: San Diego County Assessor-Recorder-County Clerk, Assessment Appeals, https://www.sdarcc.gov/content/arcc/home/divisions/assessor/assessment-appeals.html. Reviewed 2026-07-16.
Source: San Diego County Clerk of the Board, Assessment Appeal Filing Guide, https://www.sandiegocounty.gov/cob/aab/filingguide.html. Reviewed 2026-07-16.
Source: San Diego County Clerk of the Board, Assessment Appeals Boards, https://www.sandiegocounty.gov/cob/aab/index.html. Reviewed 2026-07-16.
Source: Stanislaus County Assessor, Assessment Appeals Information, https://www.stancounty.com/assessor/Appeals.shtm. Reviewed 2026-07-16.
Source: Stanislaus County Board of Supervisors, Assessment Appeals Board Rules and Regulations, https://www.stancounty.com/board/aab/pdf/aab-local-rules.pdf. Reviewed 2026-07-16.
Source: Stanislaus County Clerk of the Board, Assessment Appeals, https://www.stancounty.com/board/aab/. Reviewed 2026-07-16.
Source: Stanislaus County Clerk of the Board, Assessment Appeals Frequently Asked Questions, https://www.stancounty.com/board/aab/aab-faq.shtm. Reviewed 2026-07-16.