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Orange County · California · Free guideOrange County property tax appeal. Start with a free check.
Think your Orange County assessment is too high? This free property tax appeal guide explains how to compare your assessed value with your home's market value, request a Prop 8 review, and prepare a formal appeal. It covers homeowners in Santa Ana and throughout Orange County.
Guide updated 2026-09-04. Vulorean is an independent service, not a county office.
Free property tax appeal help in Orange County
You can use this guide and check your eligibility for free. You can also gather comparable sales and represent yourself. Start with the Orange County Assessor for the informal review process and ask the Clerk of the Board for the current formal appeal application.
County filing fees are separate. Confirm the current amount and any available fee waiver with the county.
Eligible self-file reports are free during launch. No card required. County filing fees and optional representation are separate. An account is required, with up to three free report claims per account.
View a sample report before creating an account. You handle your own filing and any hearing.
Orange County Assessor
Source: California State Board of Equalization county directory.
Where to File in Orange County
Usual filing period based on the BOE county list. County form, fee and filing details may change. Confirm current-year details with the Orange County Clerk of the Board before filing.
Orange County Prop 8 Filing Steps
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Check if your property qualifies
Use the free Vulorean eligibility check as a starting point. Compare your assessed value with evidence of market value as of January 1 before deciding to request a review.
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Gather evidence, with or without a report
Collect comparable sales that support your opinion of value as of January 1. A Vulorean report is an optional way to organize the analysis. You can prepare and file your own evidence directly with the county.
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Submit your appeal
File both: an informal review with the Assessor (online) and a formal appeal with the Clerk of the Board.
DIY Submit the informal review through Orange County's online portal. Fill out the formal Assessment Appeal Application using your Vulorean report.Concierge Your rep prepares both forms. Sign the Agent Authorization Form (included with your report - get a report to access) so they can act for you.- Informal review (online portal): assessmentappeals.ocgov.com
- Formal appeal form: Download Assessment Appeal Application (PDF) (included with your report - get a report to access)
- Property tax reappraisal landing page: cob.oc.gov — Appeal Your Property Value
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File your appeal
Submit the formal appeal to the Orange County Clerk of the Board.
DIY File online via the OC Assessment Appeals portal, or mail / deliver in person to O.C. Assessment Appeals – FORMS, 400 W. Civic Center Drive, Room 110, Santa Ana, CA 92701 (include a self-addressed stamped envelope).Concierge Your rep submits the appeal on your behalf.- Online filing portal: assessmentappeals.ocgov.com — Online filing
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Await response
If approved, you will be notified. If a hearing is scheduled, you may need to attend.
DIY Watch for a response by mail. Attend any scheduled hearing or send a representative.Concierge Your rep monitors the response and handles any hearing.
Keep the deadline in view. A request for an informal review does not extend the deadline for a formal appeal. Follow the Orange County Clerk of the Board's instructions if your review is still pending near the deadline.
What to gather for your Orange County appeal
- Your parcel number and assessment notice, with the tax year and assessed value you are disputing.
- Recent sales of similar properties in Orange County near the relevant valuation date. Explain differences in size, location and condition.
- Photos, repair estimates or corrected property records that support your opinion of value.
- A copy of everything you submit and confirmation that the county received your application.
For a regular decline-in-value appeal, focus on market value as of January 1. A lower asking price or an online estimate alone does not establish what the county should assess. Savings depend on the approved value reduction and your property's tax rates.
Start your Orange County appeal research for free
Check whether your assessment may be too high, then use the county contacts and filing steps above to decide what to do next.
Check my property for free →Orange County property tax appeal FAQ
Can I appeal my Orange County property tax for free?
Eligible self-file reports are free during launch. No card required. County filing fees and optional representation are separate. An account is required, with up to three free report claims per account. This guide and the property check are free. You handle your own filing and any hearing.
When is the Orange County property tax appeal deadline?
The usual regular assessment appeal window in Orange County is July 2 through November 30. Confirm the current year's deadline with the Clerk of the Board, including weekend or holiday adjustments. Informal review deadlines can differ. An informal request does not extend your formal appeal deadline. Supplemental and escape assessments have separate notice-based deadlines.
How do I contact the Orange County Assessor?
Contact the Orange County Assessor in Santa Ana, California, at (714) 834-2727. Official website: https://www.ocgov.com/gov/assessor. The assessor handles valuation reviews; formal appeals go to the Clerk of the Board.
What form do I file in Orange County?
Orange County uses form BOE-305-AH (Assessment Appeal Application), filed with the Orange County Clerk of the Board. Prop 8 informal reviews typically use a county specific form available at the Orange Assessor's website. Obtain the current application directly from the county. You do not need to buy a Vulorean report to get the county application.
Can the appeals board increase my assessed value?
Yes. The appeals board can lower, leave unchanged, or increase a property's assessed value based on the evidence. Continue paying tax bills on time while an appeal is pending.
Does a Prop 8 reduction last forever?
No. A decline-in-value reduction is temporary and reviewed annually. As market value recovers, the assessment can rise by more than 2% in a year, up to the applicable factored Prop 13 base year value.
Official appeal resources
- California BOE assessment appeals questions and answers
- BOE county filing periods list (the linked list currently covers 2024; confirm this year's dates with the county).
- BOE decline-in-value guidance
Related Pages
- California Property Tax Appeal Guide, statewide process
- California county picker, every other California county
- All 20 State Appeal Guides
- How to Reassess Your Property Tax