San Mateo County homeowners can challenge an over-assessment before the September 15 deadline.
β Filing-ready packet β comparable evidence, a recommended value, and county forms.
β Self-serve California appeal β you file the packet; TaxDrop does not provide hearing representation in California.
β Refunded if no reduction β the packet fee is refunded if your filing yields no assessment reduction.
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San Mateo County homeowners can challenge an over-assessment before the September 15 deadline.
β Filing-ready packet β comparable evidence, a recommended value, and county forms.
β Self-serve California appeal β you file the packet; TaxDrop does not provide hearing representation in California.
β Refunded if no reduction β the packet fee is refunded if your filing yields no assessment reduction.
San Mateo County property owners can appeal when the countyβs assessed value is higher than the evidence supports. The regular filing window runs from July 2 through September 15, and supplemental assessments generally carry a separate 60-day deadline.
TaxDrop provides a self-serve California appeal packet. The packet includes comparable evidence, a recommended value, and the county forms needed to file. TaxDrop does not provide hearing representation in California.
County assessments rely on property records, market data, and comparable sales. Errors in square footage, property condition, location factors, or the sales used for comparison can produce a value that does not reflect your property on the January 1 valuation date.
Your appeal must show why the assessed value is too high. A large tax bill by itself is not evidence; the strongest cases use relevant sales and accurate property details.
A successful appeal lowers the assessed value used to calculate your property tax bill. The dollar savings depend on the amount of the reduction and the local tax rate applied to your property.
Review the assessment notice as soon as it arrives. Waiting until the end of the filing window leaves less time to confirm property facts, select comparable sales, and prepare the required county forms.
The self-serve packet organizes the evidence and filing materials you need to submit your own appeal. It is designed to reduce research and paperwork while keeping the filing decision and submission in your hands.
Start with your property address to review potential savings. If the evidence supports an appeal, TaxDrop prepares the packet; you submit it to San Mateo County and attend any required hearing.
Sign up and TaxDrop handles the paperwork, the evidence, and the filing. It takes less than 3 minutes to enroll.
Step 1: Review Your Assessment
Receive Assessed Value Notice by July 1 showing property valuation.
Step 2: File Your Appeal
Submit Assessment Appeal Application with supporting evidence between July 2 β September 15.
Step 3: Application Review
Clerk reviews application and schedules hearing (60-90 days after filing).
Step 4: Hearing Preparation
Gather comparable sales data, appraisals, and documentation.
Step 5: Appeals Board Hearing
Present case to Board panel (typically 4-9 months after filing).
Step 6: Decision & Adjustment
Board issues written decision; if successful, assessed value reduced and tax refund issued (30-60 days after hearing).
Filing Deadlines:
Required Documents:
Where to Submit:
San Mateo County Assessment Appeals Board, 555 County Center, Redwood City, CA 94063
Official resources:
The regular filing window runs from July 2 through September 15. Supplemental assessments generally have a separate 60-day filing window, so check the date on your notice.
TaxDrop provides a self-serve California appeal packet with comparable evidence, a recommended value, and the county forms needed to file. TaxDrop does not provide hearing representation in California.
Your savings depend on the assessment reduction and local tax rate. A lower assessed value reduces the amount used to calculate your property tax bill.
Use the San Mateo County Assessorβs property search to review your current assessed value, taxable value, exemptions, and assessment history.
Useful evidence includes comparable sales near the January 1 valuation date, documentation of property condition, and corrections to inaccurate property records.
Yes. Homeowners, landlords, and commercial property owners can challenge an assessment when evidence supports a lower value.
You will usually need to wait for the next regular filing period unless a supplemental or escape assessment creates a separate deadline.
Enter your property address on TaxDrop to review potential savings and prepare a self-serve filing packet for San Mateo County.