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Mariposa County · CaliforniaAppeal Your Mariposa County Property Tax.
The Mariposa County Assessor's office in Mariposa 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.
Mariposa County Assessor
Source: California State Board of Equalization county directory.
Mariposa 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 Prop 8 review request with your report
Mariposa has a dedicated downloadable "Request for Review of Decline in Value (Proposition 8)" form.
DIY Download the form, attach your Vulorean report as supporting documentation, and submit to the Assessor's Office. Comparable sales must be no later than 90 days after the January 1 lien date.Concierge Your Vulorean rep handles the form completion and submission on your behalf.- Prop 8 request form (PDF): Request for Review of Decline in Value (PDF)
- Prop 8 review process info: mariposacounty.gov/563/Prop-8-Review-Process
- Assessor phone: (209) 966-2332
- Assessor office: 4982 10th Street, Mariposa, CA 95338
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Await assessor response
DIY If approved, your reduced value is reflected on your tax bill and reviewed annually.Concierge Your Vulorean rep monitors the response and keeps you informed. -
Formal appeal if denied
DIY File an Application for Changed Assessment (BOE-305-AH) with the Mariposa County Clerk of the Board between July 2 and September 15. Note: $30 non-refundable filing fee required. File in parallel with step 3 to protect your rights.Concierge Your Vulorean rep handles the appeal filing on your behalf.- Board of Equalization appeals: mariposacounty.org/120/Assessment-Appeals
- Clerk of the Board: P.O. Box 784, Mariposa, CA 95338
- Clerk phone: (209) 966-3222
Mariposa 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 Mariposa County Assessor in Mariposa.
When You Probably Qualify for a Mariposa County Reduction
- Your current assessed value is above recent sales of comparable homes in Mariposa County
- You bought in Mariposa County in the last 12 months below the county's assessed value
- Your Mariposa 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 Mariposa Assessor hasn't adjusted
Mariposa County Appeal Package · $50 Flat
We pull your Mariposa 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 Mariposa County Appeal →Mariposa County Property Tax FAQ
When does Mariposa County mail assessment notices?
California counties, including Mariposa, 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 Mariposa 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 Mariposa County homeowners file and represent themselves.
Will my Mariposa 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.