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Alameda County · CaliforniaAppeal Your Alameda County Property Tax.
The Alameda County Assessor's office in Oakland values every property on California's January 1 lien date. When that assessed value overshoots the market, you have two tools: an informal Prop 8 decline in value review with the assessor, or a formal Assessment Appeals Board filing with the Clerk of the Board.
Alameda County Assessor
Source: California State Board of Equalization county directory.
Alameda County Prop 8 Filing Steps
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Check if your property qualifies
Run your address or APN through vulorean.com to instantly see if your assessed value exceeds current market value as of January 1. If it does, you have a viable Prop 8 claim.
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Get your Vulorean valuation report
The report produces a market value opinion as of the January 1 lien date and includes comparable sales. Choose DIY (you file using the report) or Concierge (Vulorean handles everything from here).
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Submit the informal review form with your report
DIY File with the Alameda County Assessor using your Vulorean report as supporting documentation, ideally by April 10 (after that, you can still file for formal review).Concierge Your Vulorean rep handles the submission for you.- Owner e-form: findmyproperty.acgov.org
- PDF form: 2025-2026 Informal Request for Decline in Market Value
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Await assessor response
DIY If approved, your reduced value appears on your July notice and October tax bill.Concierge Your Vulorean rep monitors the response and keeps you informed. -
Formal appeal if denied
DIY File an Application for Changed Assessment with the AAB between July 2 and September 15 — file this in parallel with step 3 to protect your rights.Concierge Your Vulorean rep handles the appeal filing on your behalf.- Assessment Appeals Board: acgov.org/clerk/assessment.htm
Alameda County reminder: California's Prop 13 caps annual taxable value growth at 2%, so a successful appeal keeps paying dividends every year your market value sits below the Prop 13 base. Prop 8 is the complement. It lets you capture temporary market dips. Both paths run through the Alameda County Assessor in Oakland.
When You Probably Qualify for a Alameda County Reduction
- Your current assessed value is above recent sales of comparable homes in Alameda County
- You bought in Alameda County in the last 12 months below the county's assessed value
- Your Alameda Assessor parcel record has errors, wrong square footage, added features that don't exist, or incorrect grade
- Your home has unrepaired damage, structural issues, foundation settling, or major deferred maintenance
- Your neighborhood's market softened but the Alameda Assessor hasn't adjusted
Alameda County Appeal Package · $50 Flat
We pull your Alameda County Assessor record, build comparable sales, and produce a filing ready BOE-305-AH appeal in 48 hours. You keep 100% of the savings.
Start My Alameda County Appeal →Alameda County Property Tax FAQ
When does Alameda County mail assessment notices?
California counties, including Alameda, typically mail notices in June or July. Your window to file BOE-305-AH opens July 2 and closes either September 15 or November 30 depending on the county's Clerk of the Board schedule. Confirm with the Alameda Clerk's office.
Do I have to use an attorney?
No. The California Assessment Appeals Board is designed for pro se homeowners. Filing BOE-305-AH is a two page form and hearings are informal. Most Alameda County homeowners file and represent themselves.
Will my Alameda County taxes go up if I appeal?
No. California appeal outcomes at the Assessment Appeals Board are strictly reductions or no change. Prop 13 caps assessed value growth at 2% per year regardless.
Is Prop 8 the same as Prop 13?
No. Prop 13 is the base year rule that caps annual assessment growth. Prop 8 is the companion rule that lets the assessor (or you) temporarily drop your value below the Prop 13 base when the market falls. When the market recovers, your value can rise back up to the Prop 13 cap, but not above it.