You should appeal if your assessment is higher than similar homes in your area or if the assessed value doesn't match what you actually paid for the property

A property tax assessment is the value your local assessor assigns to your home for tax purposes. This number determines how much property tax you owe each year. If that number seems wrong — either too high compared to nearby homes or disconnected from the market value — you have the right to challenge it through a formal appeal process.

The decision to appeal comes down to three questions: Is your assessment genuinely out of line? Do you have evidence to prove it? And is the potential tax savings worth the time and cost? For most homeowners, the answer to all three determines whether an appeal makes financial sense.

Key Takeaways

  • You can appeal your assessment if it's higher than comparable homes sold recently in your neighborhood or if the assessed value doesn't reflect what you paid for the property.
  • Most assessors allow appeals within 30 to 45 days of the assessment notice, though some jurisdictions extend this window — check your local important date when ready.
  • The strongest evidence for an appeal is a recent comparable sale (a similar home that sold nearby for less) or a professional appraisal showing lower value.
  • Many appeals succeed because assessors made factual errors — wrong square footage, missing basement, or incorrect property classification — not because of market disagreement.
  • If your first appeal is denied, most counties allow a second appeal to the county board of assessment appeals, which is a more formal hearing process.

Signs your assessment is worth challenging

Start by comparing your assessed value to recent sales of similar homes in your area. If three comparable homes sold for $280,000, $285,000, and $290,000 in the last six months, but your assessment is $320,000, you have a strong case. The assessed value should track reasonably close to what similar properties actually sell for.

A second red flag is a gap between what you paid and what the assessor says it's worth. If you bought your home for $250,000 two years ago and the assessment just jumped to $310,000 without major renovations or a neighborhood boom, that jump deserves scrutiny. Assessments can increase year to year, but they should follow market trends, not spike unexpectedly.

The third common reason to appeal is a factual error in the assessment record itself. Assessors work from property cards that list square footage, number of bedrooms, lot size, and condition. If your card says 2,500 square feet but your home is actually 2,100, or if it lists a finished basement you don't have, the assessment is based on wrong information. These errors are often the easiest to fix.

How to gather evidence before you file

Request a copy of your property assessment record from your local assessor's office — usually available online or by phone at no cost. Review it line by line. Check the square footage against your deed or a recent appraisal. Verify the number of bedrooms, bathrooms, and any special features listed. Write down anything that's incorrect.

Next, find recent comparable sales. Your county assessor's office, county recorder's office, or real estate websites like Zillow or Redfin show what similar homes sold for in the past three to six months. Look for homes within a quarter-mile of yours, built around the same year, with similar size and condition. Print or screenshot these sales with the sale date and price. Three to five comparables is usually enough.

If the gap between your assessment and comparable sales is large — more than 10 to 15 percent — consider getting a professional appraisal. An appraisal costs $300 to $500 but carries significant weight in an appeal. The appraiser will document condition, recent sales, and market factors, giving you a formal third-party valuation.

The appeal process and timeline

Your assessment notice includes a important date to file an appeal — typically 30 to 45 days from the notice date, though some counties allow 60 days or more. Check your notice when ready and mark the important date on your calendar. Missing it usually closes your right to appeal for that year.

File your appeal with the assessor's office or the board of assessment appeals, depending on your county's process. Some jurisdictions require you to file with the assessor first; others go straight to the appeals board. Your notice should say which office handles appeals. You'll fill out a form stating why you believe the assessment is wrong and submit your evidence — the comparable sales, the corrected property details, or the appraisal.

After you file, the assessor or appeals board will review your case. Some jurisdictions schedule a hearing where you can present your evidence in person; others decide on the written record. Hearings typically happen within two to four months of filing. You may be able to attend by phone or video rather than in person — ask when you file.

What happens if your appeal is denied

If the assessor or local appeals board denies your appeal, most states allow a second appeal to the county board of assessment appeals or a similar higher-level body. This is a more formal process, often resembling a small claims court hearing. You present your evidence, the assessor presents theirs, and a panel or judge decides. The important date to file this second appeal is usually 30 to 60 days after the first denial.

If you lose the second appeal, you can sometimes pursue further legal action through the state court system, but this becomes expensive and is rarely worth it unless the assessment error is very large. Most homeowners stop after the county-level appeal.

When an appeal probably isn't worth your time

If your assessment is only 5 percent higher than comparable sales, the potential tax savings may be small. Calculate what you'd actually save: if your property tax rate is 1 percent of assessed value and you'd reduce the assessment by $10,000, you'd save about $100 per year. If an appraisal costs $400, you'd need four years of savings to break even. In that case, the appeal may not be worth filing.

Similarly, if you can't find comparable sales that support a lower value, or if your home has unique features that genuinely justify a higher price, an appeal is unlikely to succeed. An appeal works best when you have clear, recent evidence that similar homes sold for less.

Common mistakes that weaken an appeal

The biggest mistake is filing an appeal based only on disagreement with the assessed value, without evidence. Saying "I think my home is worth less" doesn't work. You need comparable sales, an appraisal, or proof of a factual error on the assessment card.

A second mistake is missing the filing important date. Once it passes, you typically cannot appeal that year's assessment. Mark the important date as soon as you receive your notice and file early rather than waiting until the last day.

A third mistake is submitting disorganized evidence. Organize your comparables by sale date, highlight the key information (address, sale price, sale date, square footage), and clearly explain why each one is comparable to your home. If you're claiming a factual error, provide documentation — a deed showing different square footage, a recent appraisal, or photos of a missing feature.

Frequently Asked Questions

Can I appeal my assessment even if I haven't received a notice?

Yes, but you need to know your important date. Contact your local assessor's office and ask when the current assessment was issued and when the appeal window closes. Some jurisdictions allow appeals year-round, while others have a specific window. If you miss the important date, you typically have to wait until the next assessment cycle, which may be one to three years away depending on your county.

What if I appeal and the assessor raises my assessment instead of lowering it?

This is rare but possible. An assessor reviewing your appeal might find that your assessment was actually too low. However, most jurisdictions protect you from this — they won't raise your assessment as a result of your appeal, only lower it or leave it the same. Check your local rules before filing, or ask the assessor's office directly whether they have this protection in place.

Do I need a lawyer to appeal my assessment?

No. Most homeowners file appeals without a lawyer and succeed. A lawyer is useful only if your case is complex, involves a large dollar amount, or you're pursuing a second appeal to the county board. For a straightforward appeal based on comparable sales or a factual error, you can handle it yourself.

How long does an appeal usually take?

From filing to decision typically takes two to four months, though it can stretch to six months in busy counties. If you lose and file a second appeal, add another two to four months. The timeline varies by jurisdiction, so ask the assessor's office for an estimate when you file.

Will appealing my assessment affect my property tax bill this year?

Usually not. Most jurisdictions don't adjust your tax bill for the current year while an appeal is pending. If your appeal is successful, the new assessment typically takes effect the following tax year. Some counties may issue a refund if you've already paid taxes based on the higher assessment, but this varies by location.