An appeal is not a lawsuit and it is not a fight. It is a paperwork exercise: you are asking the county to correct a number, and you are handing them the evidence that the number is wrong. Most homeowners can do it themselves, without a lawyer and without a firm that takes a cut of the savings. Here is the whole process, in order.
Step 1: Read your assessment notice carefully
Every year (or every few years, depending on your reassessment cycle) your county mails an assessment notice. It states the value the assessor has placed on your property for tax purposes. This is the number your bill is calculated from, so it is the number you are appealing.
Two figures matter most on the notice. The first is the assessed value or market value the assessor has assigned. The second, in many states, is the assessment ratio or assessment level, the percentage of market value that actually gets taxed. Note the date the notice was issued, because the clock on your appeal window usually starts there.
Step 2: Decide whether you actually have a case
Appealing is only worth your time if the assessment is genuinely too high. There are two common grounds:
- Over-valuation. The assessor thinks your home is worth more than it would actually sell for. This is the most common and most winnable argument.
- Lack of uniformity. Your home is assessed at a higher share of its value than comparable homes around you, even if the raw number looks plausible. Some states weigh this heavily; others barely at all.
Before you go further, run a quick sanity check: what would your home realistically sell for today, and how does that compare to the assessed market value on your notice? If the assessment is at or below what you would list for, an appeal probably will not go anywhere. Our guide on how to tell if your home is over-assessed walks through both tests in detail.
Step 3: Gather your evidence
The single most persuasive piece of evidence is comparable sales: recent sales of similar homes near you that sold for less than your assessed value. Boards think in comps because that is how appraisers think.
Good comps are recent (ideally within the last 6 to 12 months of your assessment date), close by, and genuinely similar in size, age, condition, and style. Three to five strong comps beat a dozen weak ones. Alongside comps, useful evidence can include:
- Photos of condition problems the assessor would not have seen (a failing roof, foundation cracks, an unfinished basement counted as finished).
- A recent purchase price, if you bought the home recently for less than the assessed value in an arm's-length sale.
- A professional appraisal, which carries more weight than an automated estimate but costs money.
- Corrections to the property record, if the assessor has your square footage, bed and bath count, or lot size wrong.
What evidence a board actually finds convincing is worth understanding before you assemble your packet; see what evidence actually wins a property tax appeal.
Step 4: Ask for an informal review first
Many assessor offices offer an informal review before any formal appeal. You walk through your evidence with a staff appraiser, and they either adjust the value or explain why they will not. It is free, low-stakes, and often resolves the matter without a hearing. Not every jurisdiction offers one, so confirm the process for your county; if the informal review does not get you where you want, move to the next step.
Step 5: File the formal appeal before the deadline
The formal appeal goes to a review body, often called a Board of Review, Board of Equalization, Board of Assessment Appeals, or Value Adjustment Board depending on the state. You file a form (increasingly online), state the value you believe is correct, and attach or reference your evidence.
The deadline is the part people miss. Appeal windows are short and vary widely by state and county, and a missed deadline usually means waiting a full year for the next cycle. Do not leave this to the last day; see property tax appeal deadlines for how to find yours.
Step 6: Present your case at the hearing
If your appeal reaches a hearing, it is usually short and informal, in front of a board or a hearing officer. You are not on trial. Bring your evidence, hand over copies, and make the argument in one clear line: my home's market value is X, here are the comparable sales that show it, so the assessment should be reduced to X.
Keep it factual and specific. Stick to value and comps. Arguments that rarely help: that your taxes went up a lot, that you cannot afford the bill, or that a neighbor's assessment seems unfair without the comps to prove it. The board decides on value, not on hardship.
Step 7: Get the decision, and know your next option
The board issues a decision, sometimes on the spot, sometimes by mail weeks later. If they lower your assessment, your bill drops accordingly, and in many places the lower value carries forward until the next reassessment, so the win compounds over several years, not just one. If they deny the appeal and you still believe you are right, most states offer a further level of appeal, to a state tax tribunal or court; that step is more formal, so weigh the potential savings against the cost and effort.
The short version
Read the notice, confirm you are actually over-assessed, gather three to five strong comparable sales, try an informal review, file the formal appeal before the deadline, and present your value clearly at the hearing. It is methodical rather than difficult, and the payoff can last for years.
Skip the legwork for your own address.
The report pulls a market estimate, your assessed value, the gap, the comparable sales, and the appeal steps for your area into one PDF, so your Step 3 is already done.
Get your Property Tax Appeal Report · $29