County assessors value millions of properties every year, and they get it wrong more often than you'd think. If your home is assessed at more than its current market value — the price a willing buyer would pay today — you're overpaying your property taxes. The appeal process exists precisely for this situation, and it's more accessible than most homeowners realize.
The most important thing to understand: you don't need to prove your home is worth a certain amount. You need to show that the assessor's value is higher than what comparable homes are actually selling for. That's a much lower bar, and in many markets it's easy to demonstrate with a few recent sales.
Should You Appeal?
Appeal is worth considering if any of these are true:
- ✓Your assessed value increased more than 10% from last year without a major renovation
- ✓Comparable homes in your neighborhood sold recently for less than your assessed value
- ✓Your property record contains errors (wrong square footage, bedroom count, lot size)
- ✓Your home has significant deferred maintenance or condition issues not reflected in the value
- ✓Your assessed value is higher than the price you paid for the home recently
The Appeal Process, Step by Step
Review your assessment notice
Your county assessor mails an annual assessment notice (sometimes called a TRIM notice or "Notice of Proposed Property Taxes") showing your property's assessed value. This is not your tax bill — it's the valuation that your tax bill will be based on. Read it carefully. Note the assessed value, the appeal deadline (often 25–45 days from the mailing date), and the instructions for filing.
Research comparable sales (comps)
Your strongest evidence is recent sales of similar homes near yours. Look for properties sold within the past 6–12 months that are similar in size, age, condition, lot size, and location. Your county assessor's website often has a public records search; you can also use Zillow, Redfin, or the county deed records. If comparable homes are selling for less than your assessed value, you have a strong case.
Check for errors in your property record
County records frequently contain errors: wrong square footage, incorrect number of bedrooms or bathrooms, incorrect lot size, or improvements listed that were never built. Request a copy of your property's assessment card from the assessor's office. Any factual error is grounds for an immediate reduction — no market analysis needed.
File the informal appeal first
Most counties offer an informal review before a formal hearing. Call or visit the assessor's office and explain your evidence. Many assessors will agree to a reduction at this stage if your comps are solid, saving everyone time. Get any agreed reduction in writing before you leave.
File a formal appeal if needed
If the informal review doesn't resolve the issue, file a formal appeal with your county's Board of Equalization, Value Adjustment Board, or Assessment Appeals Board (the name varies by state). You'll receive a hearing date. Bring printed copies of all your evidence: comparable sales, photos of your property's condition, repair estimates for deficiencies, and a clear summary of your argument.
Attend the hearing
Hearings are typically 15–30 minutes. Be concise and professional. Present your comparable sales first — they're your strongest argument. If your home has condition issues (deferred maintenance, foundation problems, etc.), document them with photos and contractor estimates. The board members are not adversaries; they're evaluating evidence.
Accept or escalate the decision
If the board rules in your favor, your assessed value is adjusted and your tax bill recalculated — sometimes with a refund if you've already paid. If you're not satisfied, most states allow a further appeal to a state-level board or tax court, though this typically requires an attorney and is only worth pursuing for large dollar amounts.
Tips for a Stronger Appeal
- ›File before the deadline — missing it by even one day typically means waiting a full year to try again.
- ›Use sales that closed within 6 months of the assessment date for maximum relevance.
- ›Prioritize comps with the same number of bedrooms and similar square footage over all other factors.
- ›Don't over-argue. If your comps support a 10% reduction, ask for that — not 40%. Credibility matters.
- ›Document your property's condition before the appeal window closes. Photos are dated evidence.
- ›Check whether your county has an online portal — many now allow you to upload evidence electronically.
Never miss a property tax deadline
Get a free email reminder before your county's due date — including assessment appeal windows.
Related Guides
Frequently Asked Questions
How long does a property tax appeal take?
How often do property tax appeals succeed?
Do I need a lawyer or property tax consultant to appeal?
What evidence is most effective in a property tax appeal?
Can I appeal every year?
Information is for reference only. Tax rates and laws vary by jurisdiction — consult your local assessor's office or a tax professional for advice specific to your situation.