California property tax appeals

Prop 13 keeps your taxable value low until the market dips below it. Then Prop 8 lets you ask for the lower market value.

The rules in California

Topic	California
Value date	January 1
Filing window	July 2 – November 30 in most counties (including LA, Orange, San Diego, Riverside); July 2 – September 15 in 11 counties
How it's filed	Informal decline-in-value review (LA: form RP-87), then the Assessment Appeals Board (BOE-305-AH) if needed
Your agent	No state license; you sign an agent authorization
Can it go up?	Not above your Prop 13 base value
Our fee	30% of first-year tax savings — nothing if your bill doesn't go down

Every California county

We cover all 58 California counties. Most (including Los Angeles, Orange, San Diego and Riverside) accept filings July 2 – November 30. Eleven counties close September 15; their 2026 window has passed, so we'll file for those homes next July.

Los Angeles County guide →Riverside County guide →San Diego County guide →Orange County guide →San Bernardino County guide →Santa Clara County guide →Sacramento County guide →Alameda County guide →Contra Costa County guide → How to Appeal Your Property Taxes in California, Step by Step → Get my free review

All 58 counties we serve in California

Alameda County · Sept 15
Alpine County · Sept 15
Amador County
Butte County
Calaveras County
Colusa County
Contra Costa County
Del Norte County
El Dorado County
Fresno County
Glenn County
Humboldt County
Imperial County
Inyo County · Sept 15
Kern County
Kings County · Sept 15
Lake County
Lassen County
Los Angeles County
Madera County
Marin County
Mariposa County
Mendocino County
Merced County
Modoc County
Mono County · Sept 15
Monterey County
Napa County
Nevada County
Orange County
Placer County · Sept 15
Plumas County
Riverside County
Sacramento County
San Benito County
San Bernardino County
San Diego County
San Francisco County · Sept 15
San Joaquin County
San Luis Obispo County · Sept 15
San Mateo County
Santa Barbara County
Santa Clara County · Sept 15
Santa Cruz County
Shasta County
Sierra County · Sept 15
Siskiyou County
Solano County
Sonoma County
Stanislaus County
Sutter County
Tehama County
Trinity County
Tulare County
Tuolumne County
Ventura County · Sept 15
Yolo County
Yuba County

Sept 15 = filing window ends September 15 instead of November 30.

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