How to Appeal Your Property Tax Assessment, Step by Step

A higher assessment can mean a bigger tax bill, but you do not have to accept a value you think is wrong. This guide explains how to appeal property tax assessment decisions, from reading your notice to presenting evidence at a hearing. Every state runs its own process, so we use official Texas, California and New York pages as examples and show you what to look up for your county.

What does a property tax appeal actually challenge?

A property tax appeal challenges your home’s assessed value, or a decision about your property such as a denied exemption. It does not challenge the tax rate. You win by showing that the assessor’s value is higher than your home’s market value, that your record has errors, or that your home is assessed unfairly compared with similar homes.

New York’s tax department makes this point directly: assessors do not set taxes. If your assessment is fair but you still think taxes are too high, you take that up with the school board, town board, county legislature or other taxing body (New York State Department of Taxation and Finance). Texas says the same in its own words: neither the appraisal district nor the review board sets your taxes, and the board cannot consider your personal finances (Texas Comptroller).

If you are still learning the basics of values, rates and levies, start with our explainer on how property taxes work.

Step 1: How do you read your assessment notice?

Your assessment notice tells you the value the assessor set, the tax year it applies to, and usually the deadline and instructions to appeal. Read it the day it arrives. Look for three things: the market value estimate, the assessed or taxable value, and the last day to file.

View data as table

Figure	Value
Assessment	$90,000
Implied market value	$300,000
Comparable sales	$270,000

Worked example Source: The Homeowner Guide worked example (as of October 18, 2026)

Texas, for example, requires appraisal districts to send a notice when they raise a property’s value: by April 1 for a residence homestead, or by May 1 for other property, or as soon as practical after. The notice explains how to protest and how to request an informal conference (Texas Comptroller).

If your area assesses at a fraction of value

Some places assess homes at a percentage of market value. To see the assessor’s market value estimate, divide your assessment by the local level of assessment. New York gives the formula: assessment ÷ level of assessment = the assessor’s estimate of market value (New York State Department of Taxation and Finance).

Hypothetical example. Your assessment is $90,000 and your town assesses at 30% of market value. $90,000 ÷ 0.30 = $300,000. If similar homes near you sell for about $270,000, you may have a case.

Step 2: When is the deadline to appeal?

Deadlines vary by state and sometimes by county, and missing one can cost you the right to appeal for the whole year. Find yours on your notice or your county’s website, then put it on your calendar with a reminder a week earlier.

State	Usual filing window	Where you file
Texas	May 15 or 30 days after notice mailed, whichever is later	Appraisal review board
California	July 2 to Sept. 15 or Nov. 30, by county	County assessment appeals board
New York	Grievance Day, typically 4th Tuesday in May	Board of assessment review

Source: Texas Comptroller of Public Accounts; California State Board of Equalization; New York State Department of Taxation and Finance (as of October 18, 2026)

These are examples to show how much rules differ. Always confirm your own deadline with your county.

Step 3: How do you check your property record for errors?

Pull your property record card from your county assessor’s or appraisal district’s website. Compare every detail with your home: square footage, lot size, number of bedrooms and bathrooms, year built, garage, pool, basement finish and condition. A wrong detail can raise your value, and errors are often the easiest thing to fix.

Common errors to look for:

• Living area that includes an unfinished basement or an unheated porch.
• An extra bathroom, fireplace or garage that does not exist.
• A pool or outbuilding that was removed.
• A condition rating that ignores serious problems, such as a failing foundation or roof.
• The wrong exemption status, such as a missing homestead exemption.

If you find an error, bring proof: a survey, your closing appraisal, building plans or dated photos. In Texas, owners can protest if errors exist in the appraisal records (Texas Comptroller). If the problem is a missing exemption, you may need a separate application instead of an appeal; see our guide to homestead exemptions.

Step 4: How do you find comparable sales?

Comparable sales (“comps”) are recent sales of homes similar to yours, close to yours, around the date your home was valued. They are the most common evidence in a home assessment appeal, because assessors usually value houses the same way, by comparing them with similar homes that sold recently (New York State Department of Taxation and Finance).

View data as table

Figure	Value
Market value	$100,000
Current assessment	$100,000
Fair assessment (90%)	$90,000

Source: New York State Department of Taxation and Finance (as of October 18, 2026)

Good comps share these traits with your home:

• Same neighborhood or a very similar one nearby.
• Similar size, age, style, lot and number of rooms.
• Similar condition and quality of construction.
• Sold close to the valuation date your area uses.

California’s guide adds a rule worth knowing: appeals boards may only consider comparable sales that happened no later than 90 days after the valuation date, and sales closer to that date carry more weight (California State Board of Equalization). Check whether your state has a similar limit.

Where to find sales: your county’s public sales records or assessor website, your own closing appraisal if you bought recently, and the sales the assessor used (you can often ask for them).

Equal and uniform: another angle

Even if your value is close to market, you may be over-assessed compared with your neighbors. New York gives this example: your home is worth $100,000 and is assessed at $100,000, but the town assesses at 90% of market value, so your assessment should be $90,000 (New York State Department of Taxation and Finance). Texas also lets owners protest on unequal appraisal.

Step 5: Should you ask for an informal review first?

Yes, when it is offered. An informal review is a meeting or phone call with the assessor’s office before any formal hearing. You share your evidence, they explain their value, and many cases settle there. It costs nothing and usually takes less time than a hearing.

New York suggests an informal discussion with your assessor first, noting it often helps both sides (New York State Department of Taxation and Finance). California’s guide also advises talking to your county assessor before you file (California State Board of Equalization). In Texas, you may request an informal conference with the appraisal district before your board hearing (Texas Comptroller).

Step 6: What happens at the board hearing?

If the informal step does not resolve it, your case goes to a local review board, made up of citizens or hearing officers who are not the assessor. In Texas, for example, the appraisal review board is a board of local citizens that hears disagreements between owners and the appraisal district, and it begins hearing protests around May 15 (Texas Comptroller). You and the assessor each present evidence, and the board decides the value. Hearings are less formal than court but should be treated with the same respect.

What to expect, using Texas as an example:

1. You receive written notice of the hearing date, time and place, at least 15 days ahead (Texas Comptroller).
2. You can usually appear in person, by phone or video, or by sworn written statement (affidavit).
3. You and the appraisal district each present evidence and state an opinion of value.
4. The board issues a written decision.

Tips that apply almost anywhere:

• Arrive early with the number of copies the board’s procedures ask for.
• Lead with your best two or three comps and any documented errors.
• Stay calm and stick to value. Texas reminds owners that emotional arguments and personal finances have no bearing on the decision.

Evidence checklist for your appeal

Bring what supports your value, and leave out what does not. This checklist draws on the evidence types the Texas Comptroller lists for hearings, adapted for homeowners.

If you need repair estimates, our guide to hiring a contractor explains how to get written bids from licensed pros.

What happens after the decision?

The board will lower your value, leave it the same, or in some places raise it. You get a written decision. If you win, your bill is corrected, and if you already paid, you get a refund. If you lose, you can usually take the case to a higher level, such as a state board, arbitration or court.

Things to know after a decision:

• Refunds. In Texas, if the board rules in your favor and you already paid, the taxing units send any refund that results (Texas Comptroller). California’s guide says you receive a refund with interest if your value is reduced (California State Board of Equalization).
• Values can go up. California’s appeals boards can lower, raise or confirm a value, so be sure your evidence is solid before you file.
• It may cover only one year. Texas board decisions are binding only for the tax year in question. California decline-in-value appeals apply only to the year filed, so you may need to file again next year.
• Further appeals. Texas owners can appeal a board decision to state district court and, in some cases, to the State Office of Administrative Hearings or to binding arbitration. New York homeowners can use Small Claims Assessment Review after the grievance process.
• Keep paying on time. California’s guide is clear that you must pay your taxes on time even with an appeal pending, or face penalties and interest.

How to appeal a property tax assessment: a quick recap

1. Read the notice the day it arrives and note the deadline.
2. Check your property record for errors.
3. Estimate your market value with three to five good comps.
4. Ask for an informal review, but file the formal appeal on time.
5. Organize your evidence and practice a short, calm presentation.
6. Attend the hearing, then follow up on refunds or next steps.

This guide is general information, not legal advice. For complex cases or court appeals, consider talking with a property tax attorney or licensed appraiser in your state.