California Property Tax Appeal Guide (2025)
If you believe your California property’s assessed value is too high, you may have the right to appeal your property tax assessment.
Many homeowners assume their annual assessment is final, but California law provides a formal appeal process that allows property owners to challenge an incorrect assessment.
This guide explains when an appeal may be appropriate, how the process works, important deadlines, and what evidence can help support your case.
Estimate Your Property Taxes First
Before filing an appeal, use our California Property Tax Estimator to better understand how assessed value affects your annual property taxes.
Open the California Property Tax EstimatorWhen Should You Consider an Appeal?
A property tax appeal may be appropriate if you believe:
- Your property’s assessed value exceeds its fair market value.
- Your property characteristics are incorrect.
- Your home has been assessed differently than similar properties because of factual errors.
- Your property suffered damage or a significant decline in value that has not been reflected in the assessment.
Simply believing your taxes are “too high” is usually not enough. The issue is whether the assessed value accurately reflects your property’s taxable value under California law.
Proposition 13 and Property Tax Appeals
Many California homeowners are protected by Proposition 13, which limits annual increases in assessed value.
However, Proposition 13 does not prevent you from requesting a review if you believe your property’s assessed value exceeds its current market value.
In declining real estate markets, homeowners sometimes qualify for temporary assessment reductions under Proposition 8.
The Appeal Process, Step by Step
Review Your Assessment
Before filing an appeal, review your annual assessment notice and verify:
- Property address
- Parcel number
- Assessed value
- Property description
- Square footage
- Lot size
- Number of bedrooms and bathrooms
Errors in property records occasionally occur and may affect assessed value.
Gather Evidence
Successful appeals are typically based on objective evidence rather than opinion. Helpful documentation may include:
- Recent comparable home sales
- Professional appraisals
- Photographs of property damage
- Repair estimates
- Independent market analyses
- Other documentation supporting a lower market value
Comparable sales are often among the strongest forms of evidence.
Contact Your County Assessor
Many assessment questions can be resolved without filing a formal appeal. Contact your county assessor’s office to:
- Review your assessment
- Correct factual errors
- Ask questions about valuation
- Discuss available review procedures
Some counties offer informal review processes before requiring a formal Assessment Appeals Board hearing.
File a Formal Appeal
If the issue cannot be resolved informally, you may file an application with your county’s Assessment Appeals Board. The application generally requests:
- Property information
- Current assessed value
- Your opinion of value
- Reason for the appeal
Each county administers its own appeals process, although statewide rules provide the general framework.
Appeal Deadlines
California property tax appeal filing periods vary depending on the county and type of assessment.
Many counties accept regular assessment appeals between July 2 and September 15 or November 30, depending on when assessment notices are mailed.
Because deadlines vary, always verify the filing period with your county assessor or Assessment Appeals Board.
What Happens After You File?
After filing:
- Your application is reviewed.
- A hearing may be scheduled.
- You may present evidence supporting your opinion of value.
- The county may present its own valuation evidence.
- The Appeals Board issues a decision.
The process may take several months depending on the county’s workload.
If Your Appeal Is Successful
If the Appeals Board reduces your assessed value:
- Your property taxes may be reduced.
- You may receive a refund if you already paid taxes based on the higher assessment.
- The lower assessed value may continue as allowed under California law.
If Your Appeal Is Denied
Not every appeal succeeds.
If the Board determines that the county’s assessment is supported by the evidence, the original assessed value generally remains in effect.
Some homeowners choose to seek professional legal or appraisal assistance if additional review options are available.
Frequently Asked Questions
Can I appeal every year?
Yes. If you believe your property’s assessed value is incorrect, you may generally file during the applicable filing period each year.
Will appealing increase my taxes?
Simply filing an appeal does not normally increase your assessment. The purpose of the appeal is to determine the correct assessed value.
Do I need an attorney?
Many homeowners handle straightforward appeals themselves. More complex cases may benefit from professional advice.
Do I still have to pay my tax bill while appealing?
Yes. Property taxes generally remain due while an appeal is pending. If your appeal succeeds, you may receive an adjustment or refund.
Can I appeal because my neighbor pays less?
Usually not. Assessment appeals focus on your property’s assessed value rather than another homeowner’s tax bill.
Official Resources: For official appeal forms, filing deadlines, and hearing procedures, contact your county assessor or your county’s Assessment Appeals Board.
Disclaimer
This article is provided for educational purposes only and should not be considered legal or tax advice. Appeal procedures, deadlines, and eligibility vary by county and individual circumstances. Always consult your county assessor or a qualified tax professional regarding your specific situation.