To appeal your property taxes, file a written challenge to your assessed value with your local assessor’s office or review board before the deadline printed on your assessment notice, and back it with concrete evidence that the value is wrong. The process is the same in outline almost everywhere: identify a valid reason your assessment is off, gather proof, file the paperwork on time, and present your case at a hearing if the assessor doesn’t resolve it earlier. The specifics — deadlines, forms, fees — are set locally, so confirm the details with your assessor before you file.
Grounds You Can Actually Argue
Feeling that your taxes are too high is not a ground for appeal. You need a specific, provable reason the assessed value is wrong. Three arguments carry most residential appeals.
Overvaluation. The assessor set a market value higher than what your property would actually sell for. This is the most common basis. It shows up when the assessor relies on stale sales data, misses a neighborhood decline, or overlooks the condition of your home. If comparable houses in your area are selling for $275,000 and your assessment reflects a $325,000 value, that gap is your argument.
Unequal assessment. Even if the dollar figure looks accurate, you can challenge it when similar properties nearby are assessed at a lower percentage of their market value. The principle is uniformity: like properties should be taxed proportionally. If your home is assessed at 90 percent of market value while comparable houses on your street sit at 75 percent, you can ask for a reduction to match the local norm.
Factual errors. Mistakes in the property record are usually the easiest fix. Wrong square footage, an incorrect lot size, a miscount of bedrooms or bathrooms, a residential home coded as commercial, or a basement listed as finished when it isn’t — any of these can be corrected, sometimes without a contested hearing.
Two related grounds are worth knowing about. External obsolescence covers value losses from outside forces: heavier traffic, a nearby industrial site, environmental contamination, or a local economic downturn. Functional obsolescence covers outdated features that reduce usefulness, such as an awkward floor plan or inadequate wiring. Either can justify a lower value, but only if you can show how the specific issue affects what a buyer would pay.
Check for Exemptions First
Before spending time on an appeal, look at whether an exemption can cut your bill without touching the assessment. Most jurisdictions offer a homestead exemption that reduces the taxable value of your primary residence by a set amount. Many add exemptions for seniors, disabled homeowners, and veterans. Values range from a few hundred dollars to tens of thousands, and homeowners often miss them because they don’t realize an application is required. Ask your assessor’s office what you qualify for and whether you’ve already claimed everything available.
Try an Informal Review
Most assessor offices let you request an informal review before you file anything formal. It’s usually free. You call or meet with a staff member, point out factual errors, share recent comparable sales, and describe conditions the assessor may not have known about. Clear data mistakes often get corrected at this stage without a petition or hearing.
An informal review does not replace your right to a formal appeal, and in most places it does not extend your filing deadline. Start the conversation early so you still have time to file if it doesn’t resolve.
Evidence That Moves the Needle
The appeal turns on your evidence. Opinions about fairness carry almost no weight. Documented facts about value do.
Comparable sales. Comps are the foundation of most residential appeals. Pull three to five properties that sold recently in your area and share the key traits of yours: age, size, lot dimensions, construction type, condition. Sale prices and dates are in public records at your county recorder or assessor’s website. Note the differences between each comp and your home, and explain how they affect value. A comparable that sold for $290,000 with a two-car garage, where you have a one-car garage, supports a value below $290,000 — not above.
A professional appraisal. A recent appraisal from a licensed appraiser is strong independent evidence. If you had one done for a mortgage, refinance, or purchase in the past year or two, that report can carry your case. Ordering a new appraisal for the appeal is an option, but residential appraisal fees generally run from about $300 to over $1,000 depending on the property. Weigh that cost against the potential tax savings.
Photographs and repair estimates. Document physical defects with dated photographs and written contractor bids. A $20,000 estimate to repair a cracked foundation, or a $12,000 bid to replace a failing roof, gives the reviewer a concrete reason to accept a lower value than a home in good condition.
Recent purchase documents. If you bought within the last year or two, your closing statement or sales contract shows what a willing buyer actually paid. That’s especially persuasive when the purchase price is well below the assessed value, because it reflects a real arm’s-length transaction rather than an estimate.
Filing the Formal Petition
With your evidence assembled, you submit a formal petition. The rules vary by locality, so confirm the specifics with your assessor or review board.
Deadlines Are Strict
Miss your deadline and you wait until the next assessment cycle. The window usually runs from the date your assessment notice is mailed, but its length varies a lot — some jurisdictions give as little as 30 days, others allow several months. Your assessment notice should state the filing deadline or tell you where to find it. Don’t assume an informal review buys you extra time.
The Petition
The form goes by different names, often something like Assessment Appeal Application or Petition for Review. It asks for your parcel identification number (on your tax bill or assessment notice), the assessor’s current value, your opinion of the correct value, and the basis for your appeal. Attach your supporting evidence. Many jurisdictions accept online submissions through a web portal, which gives immediate confirmation. If you mail it, use certified mail with a return receipt so you have proof of timely delivery.
Filing Fees
Some jurisdictions charge a small filing fee, often under $100; others charge nothing. The amount can depend on your property’s value. Check before you file so the fee doesn’t hold up your submission.
What Happens at the Hearing
If the appeal isn’t resolved earlier, it moves to a hearing before a local review board. The board is called different things in different places — Board of Equalization, Board of Review, Value Adjustment Board — but the function is the same.
The assessor’s valuation is presumed correct. You carry the burden of showing it’s wrong. That doesn’t mean proof beyond doubt, but it does mean more than your opinion. Comparable sales, an appraisal, photographs of defects, or documentation of factual errors are what shifts the burden. Show up without documents and the board will almost certainly uphold the original assessment.
Hearings are less formal than court but structured. You usually present first, walking the board through your evidence. The assessor or a representative responds, often with their own comps and methodology. Board members may ask about the date of a sale you cited, the condition of a comp, or whether a renovation has been finished. Most residential hearings run about 15 to 30 minutes.
The Risk of a Higher Assessment
In some jurisdictions, filing an appeal can lead the board to raise your assessment rather than lower it. It’s uncommon, but real if the evidence suggests the assessor undervalued your property. Before you file, compare your assessed value carefully to what similar homes are actually selling for. If the numbers cut both ways, think hard about whether the potential savings justify the risk.
After the Decision
The board typically mails a written decision within a few weeks to a few months. It will state whether your assessment was upheld, reduced, or increased, and explain the basis.
If your assessment is reduced, the financial benefit depends on local rules. Some jurisdictions issue a refund for taxes you already overpaid; others apply the reduction as a credit toward your next bill; some make it retroactive to the start of the tax year. Ask your local tax office how and when you’ll see the savings.
If you disagree with the decision, most jurisdictions let you escalate to a state tax tribunal or a court. The decision notice should include instructions and a deadline, which can be short — sometimes 10 to 30 days. Escalation involves more formal legal procedures and often benefits from professional representation.
When to Hire Help
Many homeowners handle their own appeals successfully. Professional help is worth considering when the property is high-value, the valuation issues are complex, or you’re uncomfortable presenting at a hearing.
Property tax consultants and attorneys who specialize in assessment appeals often work on contingency, charging nothing upfront and taking a percentage of the tax savings — typically 25 to 40 percent of the first year’s savings. You pay nothing if the appeal fails, but you give up a meaningful share if it succeeds. Get the fee structure in writing before you hire anyone, ask about their experience with your property type, and check whether your jurisdiction requires representatives at hearings to hold a specific license or credential.