AppealDesk
Rob Hartley

Rob Hartley

Founder, AppealDesk · February 28, 2026

California Property Tax Appeal Deadlines 2026 by County

Updated March 2026

California property tax appeal deadlines run from July through December, varying by county. Unlike regular reassessments protected by Prop 13, decline-in-value appeals require annual filing.

Major County Deadlines 2026

Los Angeles County

  • Regular Assessment Appeal: September 15 - November 30, 2026
  • Decline-in-Value (Prop 8): Same window
  • Board Hearings: January - March 2027

Orange County

  • Filing Period: July 2 - September 15, 2026
  • Late Filing (with fee): Through November 30, 2026
  • Online filing available

San Diego County

  • Filing Period: July 2 - September 15, 2026
  • Informal Review: Available before formal appeal
  • AAB Hearings: October 2026 - February 2027

San Francisco County

  • Filing Period: July 2 - September 15, 2026
  • Supplemental Assessment Appeals: 60 days from notice
  • Hearing Decisions: Within 120 days

Riverside County

  • Regular Deadline: November 30, 2026
  • August Notice Deadline: 60 days from notice date
  • Online filing encouraged

San Bernardino County

  • Filing Window: July 2 - September 15, 2026
  • Extended Deadline: November 30 (80% cases)
  • Hearing Schedule: Posted December 2026

Understanding California's Dual System

Proposition 13 Protection

  • Limits annual increases to 2%
  • Resets to market value upon sale
  • Appeal if: Purchase price assessment exceeds actual price paid

Proposition 8 (Decline-in-Value)

  • Temporary reduction when market value drops
  • Must file annually to maintain
  • Appeal if: Current market value below Prop 13 base

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Critical: Prop 8 Reviews Are NOT Automatic

Many California homeowners assume decline-in-value adjustments happen automatically. They don't.

You must file annually to get/keep Prop 8 reductions. Counties will restore your full Prop 13 value without notice if you don't appeal.

California-Specific Deadlines by Region

Bay Area Counties

  • Alameda: July 2 - September 15
  • Contra Costa: July 2 - September 15
  • Marin: July 2 - September 15
  • San Mateo: July 2 - September 15
  • Santa Clara: July 2 - September 15

Southern California

  • Ventura: July 2 - November 30
  • San Bernardino: July 2 - September 15
  • Kern: July 2 - September 15
  • Santa Barbara: July 2 - November 30

Central Valley

  • Fresno: July 2 - September 15
  • Sacramento: July 2 - September 15
  • San Joaquin: July 2 - November 30
  • Stanislaus: July 2 - November 30

Special California Appeal Situations

New Purchase Appeals

  • Deadline: Within 4 years of purchase
  • Best time: First year after buying
  • Key evidence: Purchase price vs assessment

Calamity Reassessment

  • Fires, earthquakes, floods trigger special rights
  • File within 12 months of damage
  • Separate from regular appeal calendar

New Construction

  • Supplemental assessment appeals
  • 60 days from supplemental notice
  • Challenge value added, not base

What Happens If You Miss the Deadline?

California is strict. No deadline extensions except for:

  • Documented hospitalization
  • Natural disasters
  • Death of property owner

"I didn't know" or "was traveling" = denied.

Cost of missing: If over-assessed by $100,000, you lose $1,000+ in savings for the year.

California Appeal Application Requirements

Minimal for filing:

  • Assessor Parcel Number (APN)
  • Property owner name
  • Opinion of value
  • $60 filing fee (most counties)

Evidence comes later: File first, build case second. Don't miss deadline gathering evidence.

Winning California Appeals

Strong Arguments:

  • Recent comparable sales (6-18 months)
  • Same neighborhood/zip code
  • Similar size and features
  • Closed sales only (not listings)

Prop 8 Specific:

  • Show market decline since last assessment
  • Include market reports
  • Emphasize temporary nature

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County-Specific Tips

Los Angeles

  • Extremely backlogged — file early
  • Online filing recommended
  • Settlements common pre-hearing

Orange County

  • Informal review often successful
  • Strong online system
  • Quick decisions

San Diego

  • Prefers email evidence submission
  • Reasonable hearing officers
  • Good settlement rate

Action Plan by Filing Period

If Your County Deadline is July-September:

  1. March-April: Review assessment
  2. May: Gather comparable sales
  3. June: Prepare application
  4. July 2: File immediately (don't wait)

If Your County Deadline is November:

  1. August: Check assessment notice
  2. September: Research comparables
  3. October: Complete application
  4. Early November: File (avoid late rush)

Don't Let Complexity Stop You

California's county-by-county system is confusing by design. Add Prop 13 vs Prop 8 rules, and most homeowners give up.

AppealDesk simplifies California appeals with:

  • County-specific deadline tracking
  • Prop 8 vs regular appeal guidance
  • California-compliant comparable analysis
  • Pre-filled county forms
  • Filing instruction by county

Remember: Your Deadline Is Final

Whether it's July 2 or November 30, California counties don't negotiate deadlines. File on time or pay full assessment.

The average California appeal saves $2,053 per year. In high-value counties, savings often exceed $5,000 annually.

Don't leave that money on the table. Check your county deadline. Mark your calendar. File on time.

Your move. Their money. Choose wisely.