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Napa County · CaliforniaAppeal Your Napa County Property Tax.
The Napa County Assessor's office in Napa 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.
Napa County Assessor
Source: California State Board of Equalization county directory.
Napa 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. You can also check your value notice online at the Napa Assessor parcel portal.
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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 Decline in Value review request with your report
Napa has a dedicated downloadable "Request for Decline in Value Review" form. Informal review deadline: November 15. Comparable sales must be no later than March 31.
DIY Complete the form, attach your Vulorean report as supporting documentation, and submit to the Assessor's Office.Concierge Your Vulorean rep handles the form completion and submission on your behalf.- Decline in Value Review form (PDF): Decline in Value Review Request (PDF)
- Assessor phone: (707) 253-4459
- Email: assessor@countyofnapa.org
- Assessor office: 1127 First Street, Suite A, Napa, CA 94559
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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 Napa County Assessment Appeals Board between July 2 and November 30. Note: $75 non-refundable fee for residential properties; $150 for commercial/other. The Assessor recommends filing a protective appeal while your informal review is pending — do not wait for a result.Concierge Your Vulorean rep handles the appeal filing on your behalf.- Assessment Appeals info: napacounty.gov/1415/Assessment-Appeals
- Assessment Appeals Process: napacounty.gov/154/Assessment-Appeals-Process
Napa 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 Napa County Assessor in Napa.
When You Probably Qualify for a Napa County Reduction
- Your current assessed value is above recent sales of comparable homes in Napa County
- You bought in Napa County in the last 12 months below the county's assessed value
- Your Napa 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 Napa Assessor hasn't adjusted
Napa County Appeal Package · $50 Flat
We pull your Napa 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 Napa County Appeal →Napa County Property Tax FAQ
When does Napa County mail assessment notices?
California counties, including Napa, 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 Napa 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 Napa County homeowners file and represent themselves.
Will my Napa 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.