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. It is not the same as market value or what you paid. If that assessed value seems wrong — either because it is inflated compared to comparable homes or because the assessor made a factual error about your property — you have the right to challenge it through a formal appeal process.
Whether you should appeal depends on three things: whether you have evidence the assessment is genuinely too high, whether your local appeal deadline has passed, and whether the cost and effort of appealing makes sense for your situation. Most appeals are free or low-cost to file, but they require documentation and time.
Key Takeaways
- You can appeal your assessment if it is higher than the assessed values of similar homes in your neighborhood or if the assessor made errors about your property's condition or features.
- Most jurisdictions have a specific filing deadline — usually 30 to 45 days after you receive your assessment notice — and missing it closes your right to appeal that year.
- You will need comparable sales data from your area, photos of your property, and documentation of any errors in the assessor's records to support your appeal.
- The appeal process typically starts with a local board of review or assessment appeals office, and you can escalate to county or state level if you lose at the first stage.
- A successful appeal usually lowers your assessment, which reduces your annual property tax bill, but the savings depend on your local tax rate and assessment reduction.
When the assessment is likely too high
The most common reason to appeal is that your home's assessed value is significantly higher than the assessed values of similar homes nearby. If your neighbor's house sold for $350,000 and is assessed at $280,000, but your house — similar in size, age, and condition — is assessed at $320,000, that gap suggests an error in your assessment.
You should also appeal if the assessor's records contain factual mistakes about your property. Common errors include listing a finished basement as unfinished, overstating square footage, missing a roof replacement or major repair, or assigning the wrong number of bedrooms or bathrooms. These errors directly inflate the assessment.
A third reason to appeal is if your property has a significant defect or limitation that the assessor did not account for. Examples include a property line dispute, environmental contamination, or a home located near a highway or power lines. These factors should reduce value but are sometimes missed in the initial assessment.
Understanding your local appeal deadline
Every jurisdiction sets its own deadline for filing an appeal, and missing it means you cannot challenge that year's assessment. Most deadlines fall between 30 and 45 days after the assessment notice is mailed, though some areas allow 60 days or more. A few jurisdictions have rolling deadlines tied to when you receive your notice rather than a single date for all properties.
Check your assessment notice itself — it should state the deadline clearly. If it does not, contact your local assessor's office or visit their website. Do not assume you have until the end of the year; most deadlines are in spring or early summer. If you miss the deadline, you typically cannot appeal until the next assessment cycle, which may be one to three years away depending on your area.
Some jurisdictions allow a brief extension if you can show good cause — for example, if the notice was misdirected or you were out of the country. Contact your local appeals board to ask; extensions are rare but possible.
What documents you will need to gather
The strength of your appeal depends on the evidence you bring. Start by collecting comparable sales data — the sale prices and assessed values of homes similar to yours that sold recently in your area. Real estate websites like Zillow, Redfin, and county assessor websites often show this information. You need at least three to five comparable properties, ideally within a quarter-mile of your home and sold within the past six to twelve months.
Next, document any errors in the assessor's records. Photograph your home's exterior and interior, especially any features the assessor may have missed or misrepresented. If the assessor's records say your roof is in poor condition but you replaced it two years ago, bring the contractor's invoice or receipt. If the records list square footage incorrectly, measure the home yourself or obtain the original deed or survey.
Gather any other evidence of reduced value: a Phase I environmental report if contamination is an issue, a property survey if there is a boundary dispute, or inspection reports documenting deferred maintenance. Keep copies of your purchase deed and closing statement; they show what you paid and can support an argument that the assessment is too high if you bought recently.
How the appeal process works in most jurisdictions
The first step is filing a formal appeal with your local board of review, assessment appeals office, or assessor's office — the name varies by location. You will submit a written statement explaining why you believe the assessment is wrong, along with your supporting documents. Some jurisdictions require a specific form; others accept a letter. Check your assessor's website or call to confirm what format they want and where to file.
After you file, the board or office will schedule a hearing, usually within two to four months. You may be able to present your case in person, by phone, or by submitting documents only — again, this varies by location. At the hearing, you present your evidence and explain why the assessment should be reduced. The assessor may present a counter-argument. The board then decides whether to uphold, reduce, or (rarely) increase the assessment.
If you disagree with the board's decision, most jurisdictions allow a second appeal to a county board of equalization or state tax court. This escalation is less common and more formal, and you may want to consult a property tax professional at this stage. The cost of escalation — in time and sometimes in professional fees — should be weighed against the likely tax savings.
Calculating whether an appeal is worth your time
A successful appeal reduces your assessment, which lowers your annual property tax bill. The actual savings depend on your local tax rate. If your assessment is reduced by $20,000 and your local tax rate is 1 percent of assessed value, you save $200 per year. If the rate is 2 percent, you save $400. Over ten years, that compounds, but the upfront effort is the same.
Consider the effort required: gathering comparables, photographing your home, organizing documents, and attending a hearing typically takes five to fifteen hours. If your likely annual savings is $100 or less, the return on that effort is small. If savings are $300 or more per year, the appeal is usually worth pursuing. For savings between $100 and $300, it depends on how much time you have and how confident you are in your evidence.
If your case is complex — for example, if it involves environmental issues or a significant property defect — hiring a property tax professional or attorney may cost $500 to $2,000 but can strengthen your appeal and handle the work for you. Some professionals work on contingency, taking a percentage of the tax savings rather than an upfront fee.
What happens if your appeal succeeds
If the board reduces your assessment, the new value takes effect immediately for tax purposes. Your next property tax bill will reflect the lower assessment. The reduction typically applies to the current tax year and future years, though some jurisdictions limit refunds to the current year only. Check with your assessor's office to confirm whether you receive a refund for overpaid taxes from prior years.
A successful appeal does not affect your home's market value or your mortgage. It only changes the value used for tax calculation. If you sell your home later, the buyer's lender will order a new appraisal, which is separate from the tax assessment.
Keep documentation of your successful appeal. If the assessor reassesses your property in future years, you can reference the prior appeal to challenge inflated values again. Some jurisdictions use the prior appeal as a baseline for future assessments.
Frequently Asked Questions
What if I just bought my home and the assessment seems too high?
Recent purchase price is strong evidence. If you bought for $300,000 and the assessment is $340,000, that gap is worth appealing. Bring your deed and closing statement. However, assessments are based on market value, not your purchase price, so a higher assessment is not automatically wrong — it depends on comparable sales in your area and when you bought relative to market conditions.
Can I appeal if I am behind on property taxes?
Yes. Owing back taxes does not prevent you from appealing the assessment. In fact, a successful appeal may reduce the amount you owe going forward. Contact your local assessor's office to confirm the appeal process and deadline; do not let tax debt delay your filing.
What if the assessor refuses to meet with me before the hearing?
Most assessors do not meet informally before the appeal hearing. The formal hearing is where you present your case. However, you can call the assessor's office to ask whether they will correct obvious factual errors — like square footage or number of bedrooms — without requiring a formal appeal. Many will if the error is clear and documented.
How long does it take to get a decision after I file?
Most local boards issue decisions within two to four months of the hearing. Some take longer if they have a large backlog. Ask for an expected timeline when you file. If you do not receive a decision within six months, contact the board to follow up.
If I win my appeal, will my taxes go down permanently?
The reduced assessment applies to the current year and future years, lowering your annual tax bill. However, the assessor can reassess your property in future cycles — typically every one to three years depending on your area. A successful appeal does not lock in a lower value forever, but it establishes a baseline that the assessor must justify if they try to raise it again.