How to appeal your property tax assessment if it's too high
If your home is worth less than its assessed value, appeal your property tax assessment by the deadline on your notice. Start with an informal review at the assessor's office, then go to the local board. Your Closing Disclosure and three to five comparable sales are your best evidence. Deadlines are short and vary by location.
What a property tax appeal is
An assessment is the value your local government uses to figure your tax bill. In an appeal, you argue that the value is wrong. It isn't a complaint about the tax rate, and a board won't consider one. In Warwick, New York, for example, the review board hears assessment complaints only.
Buying a house can change the picture. In California, assessed value is generally set when a property changes ownership. In Florida, assessed value resets to market value after a sale. So your first bill may look nothing like the seller's, and your purchase price is useful evidence.
There are usually two levels. An informal review with assessor staff can fix plain errors. If that fails, a formal appeal goes to a local board. After that, some owners go to a state body or court, usually with a lawyer.
When to appeal your property tax assessment
Start the day your notice arrives. Consumer guides put the usual window at about 30 to 90 days after the notice, though some places use a fixed date instead. Missing it can mean waiting a year, so find the exact date on your notice or the assessor's website.
One timing trap: your comparable sales need to match the valuation date, not today's market. Warwick, for example, requires sales that reflect value as of July 1, and says current sales and listings don't count. Your notice or the assessor can tell you your date.
What you can save if you lower your property tax assessment
A worked example with made-up numbers, and a made-up tax rate of 1.2%:
| Line | Amount |
|---|---|
| Assessed value on your notice | $400,000 |
| What comparable sales support | $360,000 |
| Reduction you're asking for | $40,000 |
| Tax at 1.2% on that reduction | $480 a year |
Some places assess at a percentage of market value, so compare like with like. One guide says a gap of about 5% or more is generally worth pursuing. For comps, consumer guides suggest 3 to 5 arm's-length sales within about a mile, from the past 6 to 12 months, and within about 10% to 20% of your square footage. An independent appraisal, about $300 to $500 by one estimate, may not be needed if your purchase was recent.
How to appeal your property tax assessment
- Read the notice closely
Note the assessed value, the deadline and how to file. Check if it's market value or a percentage.
- Pull your property record card
Look for wrong square footage, bedrooms, bathrooms, garage or year built. Guides call these the easiest wins.
- Ask for an informal review
Call the assessor's office. Clear errors can often be fixed without a hearing.
- Gather evidence
Collect your Closing Disclosure, comps, photos and repair estimates or inspection reports for any defects.
- File before the deadline
Submit the local form with your parcel number, the value you're proposing and copies of your evidence. Keep proof of filing.
- Present your case
Hearings are usually short, one guide says 5 to 10 minutes. Lead with your strongest evidence.
- Check the outcome
Confirm the corrected value on your next bill. If you lost, ask about the next level and its deadline.
Property tax appeal deadline by state
Every state has its own process, and even counties differ. These dates from a consumer guide show the range. Confirm yours locally, since they can change:
| State | Typical deadline |
|---|---|
| New Jersey | April 1 |
| Connecticut | February 20 |
| Ohio | March 31 |
| Texas | May 15, or 30 days after notice |
| Florida | 25 days after the TRIM notice |
| California | September 15, or November 30 in some counties |
Board names differ as well. California uses assessment appeals boards or a county board of equalization, and its form is BOE-305-AH, available from the county clerk of the board.
Mistakes to avoid in a property tax appeal
- Arguing about the rate or how high taxes feel. Stick to value and facts.
- Foreclosures and family sales as comps. Guides say to avoid them.
- Skipping your tax bill. One guide says the bill stays in effect during an appeal, with overpayments typically refunded or credited. Confirm this locally before you withhold anything.
- Paying for help on a simple case. Consultants often work on contingency, typically 25% to 40% of first-year savings by one estimate.
- Handing the board your only copies. Warwick keeps what you submit.
This is general information. For a complex case or a court appeal, talk to a property tax attorney.
How to appeal property taxes: common questions
Can my purchase price lower my property tax assessment?
It can help. A recent arm's-length purchase below the assessed value is useful evidence, so bring your Closing Disclosure. How much weight it gets depends on local rules and the valuation date.
How long do I have to appeal a property tax assessment?
It depends on where you live. Consumer guides say about 30 to 90 days after the notice, but some places use fixed dates. Check your notice, since a late appeal may not be accepted.
Do I need a lawyer to appeal my property taxes?
Usually not for an informal review or a local hearing. Guides suggest help mainly for complex or higher-value cases, or at state level, where legal representation is common.
Sources: boe.ca.gov, townofwarwickny.gov, ircpa.org, propertytaxbystate.com, countrytaxcalc.com
General guidance for U.S. homes, not professional advice. For gas, electrical and structural work, call a licensed pro.