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Marin County · CaliforniaAppeal Your Marin County Property Tax.
The Marin County Assessor's office in San Rafael 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.
Marin County Assessor
Source: California State Board of Equalization county directory.
Marin County Prop 8 Filing Steps
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Check if your property qualifies
Run your address or APN through vulorean.com to 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 your informal review request with your report
Marin has a dedicated online "Request for Informal Assessment Review" form — filing window is July 1 – October 31.
DIY Complete the online form and attach your Vulorean report as supporting documentation.Concierge Your Vulorean rep handles the form completion and submission on your behalf.- Online informal review form: arcc.marincounty.gov — Request Informal Assessment Review
- Prop 8 info page: arcc.marincounty.gov — Decline in Value
- Assessor phone: (415) 473-7215
- Assessor office: 3501 Civic Center Drive, Room 208, San Rafael, CA 94903
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Await assessor response
DIY If approved, your reduced value is reflected on your tax bill and reviewed automatically each year — no need to re-file.Concierge Your Vulorean rep monitors the response and keeps you informed. -
Formal appeal if denied
DIY File an Application for Changed Assessment with the Marin County Assessment Appeals Board between July 2 and November 30. File in parallel with step 3 — do not wait for the informal result.Concierge Your Vulorean rep handles the appeal filing on your behalf.- Assessment Appeals Board info: arcc.marincounty.gov — Important Dates
- Clerk of the Board: (415) 473-7331
Marin 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 Marin County Assessor in San Rafael.
When You Probably Qualify for a Marin County Reduction
- Your current assessed value is above recent sales of comparable homes in Marin County
- You bought in Marin County in the last 12 months below the county's assessed value
- Your Marin 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 Marin Assessor hasn't adjusted
Marin County Appeal Package · $50 Flat
We pull your Marin 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 Marin County Appeal →Marin County Property Tax FAQ
When does Marin County mail assessment notices?
California counties, including Marin, 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 Marin 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 Marin County homeowners file and represent themselves.
Will my Marin 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.