Overpaying on property taxes?
California homeowners save an average of $1,500/year.
Enter your address and see your potential savings. Free. 60 seconds.
Range reflects 10–20% overassessment on median home values in Alameda County ($925K) and Santa Clara County ($1.5M) at a 1.1% effective tax rate. Sources: Redfin, January 2026.
How it works
California law lets you request a review of your property tax assessment directly through your county Assessor's office. No cost to file, no hearings, and your assessment stays the same or goes down — never up. We help you build a strong case and submit it.
Step 1
Check if you're overpaying
Enter your address and we compare your county assessment to current market value. Free. Takes about 10 seconds.
Step 2
Get your evidence package
We pull comparable sales near you, calculate professional-grade adjustments, and give you the exact values to put on the county form.
Step 3
File in minutes
Submit your request through the Assessor's office — no cost, no hearings. If they agree, your assessment goes down. If not, nothing changes.
Everything you need to file your appeal
Start with a free check. When you're ready, the Filing Guide gives you a complete, ready-to-submit package.
File your appeal in about 10 minutes
- Comparable sales ranked by strength for your case
- Dollar-for-dollar adjustments for each comparable property
- Step-by-step filing instructions you can copy and paste
- Ready-to-submit value narrative for the county form
- Talking points if the assessor pushes back
- Downloadable PDF evidence packet with neighborhood map
Start with a free check — to see if you qualify.
File your informal review request soon — it's free
County assessors recommend submitting informal review requests early. No fee, no hearing — just submit your evidence and a certified appraiser reviews it. File early for the best chance of a timely review.
Understanding California property tax
Most California homeowners don't know this — but you might be paying more property tax than you have to.
What is Proposition 8?
When your home's market value drops below its assessed value, Prop 8 lets you pay taxes on the lower amount. Most homeowners don't know this exists.
Read moreCounty GuidesFind your county's appeal guide
Every county has different forms, deadlines, and fees. Find the guide that's built for where you live.
Read moreCommon questions about California property tax appeals
Straight answers — no jargon, no runaround.
Most qualifying homeowners save between $1,000 and $3,000 per year, depending on the gap between their assessed value and current market value. The larger the gap, the bigger the savings. Your actual savings depend on your specific property, local comps, and your county's tax rate.
Source: Alameda County Assessor data, 2024–2025 assessment cycle.
Learn how Proposition 8 reduces your taxesProposition 8 is a 1978 California law that lets homeowners pay property taxes based on their home's current market value when it drops below the county's assessed value. If comparable homes in your area are selling for less than your assessment, you have the legal right to request a temporary reduction.
Read the full guide to Proposition 8Compare the assessed value on your property tax bill to your home's current market value. If similar homes nearby have recently sold for less than your assessed value, you're likely overassessed. Overassessed does this comparison for you — enter your address and we'll pull your assessment and run the analysis.
Filing an informal review with your county Assessor is free — that's California law. A formal appeal through your county's Assessment Appeals Board has a small filing fee that varies by county. Overassessed charges $45 for a complete Filing Guide with comparable sales evidence and step-by-step instructions — no percentage of savings, no recurring fees.
You need comparable sales — recent sales of homes similar to yours in size, condition, location, and features that sold for less than your assessed value. The strongest appeals include professional-grade adjustments that account for differences between the comps and your property.
Learn what makes strong comparable sales evidenceAn informal review through the Assessor's office typically takes a few weeks to a couple of months from submission to determination. Formal appeals through the Assessment Appeals Board can take longer depending on their schedule and caseload.
Yes. The informal review process is designed for homeowners to handle themselves — no legal training or professional representation required. You just need comparable sales evidence showing your home is overassessed. Overassessed gives you the same kind of evidence a professional would prepare, ready to submit.
See the step-by-step filing process