Assessment higher than your purchase price? Here's what to do

Last updated 2026-07-11

Why does your assessment exceed your purchase price?

Assessors do not watch sales in real time. Most counties reassess on a cycle, anywhere from every year in some states to every four or five years in others, and the number they land on comes out of a mass-appraisal model built from pooled sales data, not your specific closing ^[1]. So you closed escrow three months ago. The notice in your mailbox might be built on a model tuned to last year's sales. Or it has your square footage wrong. Or it misread your home's condition.

There is also a legal wrinkle called the "assessment ratio." Many states do not assess at 100% of market value. They assess at a fraction: 80%, 50%, sometimes as low as 10% of appraised value in rural jurisdictions. The taxable base then gets adjusted by an equalization rate to make the math consistent ^[2]. Compare your raw assessed value to your purchase price without accounting for that ratio and the gap looks terrifying when the numbers are actually fine. Look up your state's legal assessment ratio first. Your county assessor's website lists it.

Assessors still get it wrong constantly. A 2023 study by the Lincoln Institute of Land Policy found systematic assessment inequality in most major U.S. cities, with lower-value homes often taxed at higher effective rates than higher-value ones ^[3]. You are not paranoid. The number really might be off.

Is a purchase price legally binding on an assessor?

No, but it is about as persuasive as evidence gets. Many state courts treat a recent arm's-length sale as the best available proof of market value. The phrase that matters is "arm's-length." It means the buyer and seller were unrelated, neither was under pressure, the property hit the open market, and both sides acted in their own interest ^[4].

Meet that test and the assessor is stuck. They have to argue your home is worth more than a real buyer just paid for it on the open market. That is a hard case to make. Courts in New York, Illinois, Texas, and Ohio have all upheld purchase prices as controlling evidence in appeals where the assessor could not show the sale was unusual.

Your sale is NOT arm's-length if you bought from a relative, bought at a foreclosure auction, bought in a short sale where the bank ate part of the mortgage balance, or wrote in some odd seller concession that pumped up the sticker price. The assessor can toss those out, fairly. Be honest with yourself about which bucket your sale falls into before you build an appeal on it.

How much time do you have to file an appeal?

This is the question that kills more good appeals than anything else. Deadlines are hard. Most jurisdictions grant no extensions. The clock usually starts on the date printed on the assessment notice, not the day you opened the envelope.

The table below shows appeal windows for a sample of major states. These are the general statutory windows. Your specific county may run a shorter local deadline, so verify with your county assessor's office before you count on any of them.

State	Typical appeal window	Starts from
California	60 days (most counties)	Assessment notice date [5]
Illinois (Cook County)	30 days from publication	Township reassessment schedule
New York City	March 15 (tentative roll deadline)	Annual
Texas	May 15 or 30 days after notice	Whichever is later [6]
Florida	25 days	TRIM notice date [12]
Georgia	45 days	Assessment notice date
Ohio	March 31 of the tax year	Annual
New Jersey	April 1 or 45 days after notice	Whichever is later

Unsure of your deadline? Call your county assessor's office and ask, word for word: "What is the last date I can file a formal appeal of my assessment notice dated [X]?" Get the name of the person who answers. Write it down.

Readers in specific metros should check local quirks first. The appeal processes for Cook County, Los Angeles County, Gwinnett County, and Bexar County each have wrinkles worth knowing before you file.

What evidence do you need when the sale price is your main argument?

Your closing disclosure or HUD-1 settlement statement is the centerpiece. It shows the contracted price, the date, and who was on each side of the deal. Make a clean copy. Attach it to your appeal form as Exhibit A.

Next, show the sale was arm's-length. A printout of the Multiple Listing Service (MLS) listing with days on market, the list-price history, and the "sold" stamp does most of that work. No MLS access? Your agent can pull it, or you can print the detail page from Zillow or Redfin showing the sale date and price.

Pull three to five comparable sales ("comps") that confirm your price was normal for the market. The assessor cannot brush off your sale as an outlier when you show four other homes in the same neighborhood that sold within 15% of your price in the same window. County assessors often publish their own comp data through their property search portals. Use their numbers against them ^[7]. A clean set of comps puts you in a strong spot.

Last, photograph any condition problems your home had at sale that the assessor may not know about: deferred maintenance, an old roof, a non-permitted addition that drags on value. These back up your price if the assessor tries to argue the sale was depressed.

How do you actually file the appeal?

Get the right form first. Most counties use a formal petition, sometimes called a "petition for review," an "application for abatement," or a "protest form." It lives on the county assessor's website or the county board of equalization site. Download it. Do not send a free-form letter instead.

Fill in your parcel number (it's on the assessment notice), your name and contact info, the assessed value you are challenging, and the value you think is right. Enter your purchase price as your opinion of value. State your basis in one line: "Property sold at arm's-length on [date] for [price], per the attached closing disclosure."

Attach your evidence in order. Lead with the closing disclosure, then the MLS printout or sold listing, then your comps. Number every page. Keep a copy of the whole packet.

Then file by the deadline. Many counties take electronic filings through their portals now. Some still want physical mail or in-person delivery. If you mail it, use certified mail with return receipt so you hold proof of delivery. That green card has rescued appeals the assessor's office swore never showed up.

The informal hearing, if your jurisdiction offers one, usually comes first. A staff assessor reviews your evidence and may float a settlement. Plenty of purchase-price appeals close right here, before any formal board ever sees the file. With a clean arm's-length sale and tight documentation, do not be shocked when the reviewer drops your value on the spot.

What if the assessor argues your sale price was too low?

This shows up most in hot markets, where the assessor's model sees nearby sales climbing above what you paid, or when you bought a fixer and the assessor insists the home is worth more in "as-repaired" shape.

Their burden is real, not a formality. They have to show, with evidence, that your sale did not represent the market. The usual arguments: your deal was a short sale or foreclosure (check your paperwork, it should say on the deed), you got unusual concessions that inflated the sticker price, or the sale fell outside the "look-back" window their model uses.

None of those apply? Push back. Ask the assessor exactly what evidence supports the claim that your arm's-length sale understated market value. Request their comparable sales. Most states' public records laws give you the right to that data. Then line their comps up against yours. If theirs sit in a different neighborhood, carry more square footage, or postdate your sale, say so at the hearing.

Nobody has clean data on how often assessors successfully override a recent arm's-length sale. The closest read comes from practitioners who handle these cases, and they report that well-documented purchase-price appeals prevail at a high rate, especially when the sale is under 12 months old.

Can you appeal every year if the assessment stays too high?

Yes, in most states. An assessment appeal is not a one-shot right. If the assessor refuses to cut your value this year, refile next year. The catch: as time passes, your purchase price loses power. The assessor can argue the market moved between your sale date and the current assessment date, which lands hard in a rising market.

That's why speed matters. If your sale is fresh, under 18 months old, your closing disclosure is tough to argue with. If it's three years old and the local market jumped 30% since, the assessor has a fair counterargument.

Lose at the informal stage and most states let you escalate to a formal board hearing, then to the state tax court if that fails too. The path varies. In Texas, the protest goes to an Appraisal Review Board (ARB), then to district court or the State Office of Administrative Hearings ^[6]. In New York City, the Small Claims Assessment Review (SCAR) program runs a low-cost formal hearing for residential owners ^[8]. In California, the Assessment Appeals Board hears formal cases after informal review fails ^[5].

Readers in Montgomery County, Santa Clara, or Hennepin County should read their county's specific guidance before pushing past the informal stage. The escalation rules differ enough to matter.

What if you bought a home but the assessment reflects the prior owner's value?

Some states cap annual assessment increases for existing owners but reset to full market value the moment ownership changes. California is the famous one: Proposition 13 holds increases to 1% a year for current owners, then reassesses at market value on a sale ^[9]. So you might see your assessed value leap after purchase because the prior owner sat on a 1978 base year value and your sale just tripped the reassessment. That jump is legal and working exactly as California law intends.

Here your appeal is not about beating your purchase price. It's about whether the value they landed on matches what you actually paid. Assessed at $610,000 but you paid $590,000? That $20,000 gap is worth appealing, and your closing disclosure still anchors it.

Michigan and Florida also run some form of acquisition-value or recent-sale reassessment. Check whether your state uses a uniform market-value standard or an acquisition-value system, because your strategy changes with the answer.

The county assessor's own portal is usually the best first stop for how the mechanics work near you. The Bibb County Tax Assessor and NYC property tax guides on this site show how far local rules can drift from each other.

Should you hire a consultant or do this yourself?

For a clean purchase-price appeal, skip the consultant. The single strongest piece of evidence in property tax law is already sitting in your closing file. You can write the petition yourself in half an hour.

Contingency firms typically take 30% to 50% of the first year's tax savings. Save $1,200 a year and they keep $360 to $600. On a purchase-price appeal, where the outcome is fairly predictable and the evidence is already in your hands, that fee is hard to justify.

Where consultants actually earn it: commercial properties with income-based valuations, appeals that need a licensed appraisal to rebut the assessor's model, multi-year fights with an aggressive assessor, and cases headed to tax court where you need a lawyer anyway.

For a residential purchase-price appeal, the TaxFightBack DIY appeal kit walks you through the exact forms and evidence checklist so you keep every dollar of the savings. This article already gives you everything you need to file for nothing. The kit just saves you time.

One trap to watch: some contingency firms bury a multi-year contract that hands them your appeal savings indefinitely. Read the fine print before you sign.

What happens to your tax bill while the appeal is pending?

You still owe the tax on the original assessed value while the appeal grinds through the system. Sitting on your bill to wait out the result is a mistake. In most jurisdictions, unpaid taxes rack up interest and penalties that can swallow whatever you'd save on the appeal, and in bad cases lead to a tax lien ^[10].

Pay on time. Win the appeal and you get a refund of the overpayment, sometimes with interest depending on your state. Texas, for instance, refunds successful appellants within 60 days of the ARB order, and the refund accrues interest at 9.5% a year for the overdue period ^[6]. California also requires refunds within 60 days of a final decision ^[5].

Some counties offer a payment-under-protest option, where you flag the dispute right on the payment. That preserves your refund right and keeps the payment from counting as acceptance of the assessed value. Ask your county whether it's available and which form it needs.

Managing payments online? The online tax payment for property guide covers how to flag a protest on electronic payments in counties that support it.

Frequently asked questions

Can I use my purchase price as evidence even if I bought the home recently?

Yes, and a recent sale makes your case stronger, not weaker. Courts in most states treat a bona fide arm's-length sale as among the best evidence of market value. The closer the sale is to the assessment date, the harder it is for the assessor to claim the property is worth more. Attach your closing disclosure to the appeal form and note the sale date plainly.

What if the assessor says my sale was not arm's-length?

Make them explain exactly why. The burden sits on the assessor to back that claim with evidence. Common disqualifiers are sales between relatives, foreclosures, short sales, and deals with odd concessions. If none apply, your sale is almost certainly arm's-length and their objection is thin. Bring your MLS listing showing normal market exposure to knock it down.

How do I calculate whether my assessment is actually too high after the assessment ratio?

Look up your state's legal assessment ratio (the assessor's website lists it). Divide your assessed value by that ratio to get the implied market value the assessor is using. Compare that to your purchase price. Example: assessed value $320,000, ratio 80%, implied market value $400,000. If you paid $360,000, that is a $40,000 gap worth appealing.

Will winning an appeal affect my neighbors' taxes?

Not directly. Each property's appeal is decided on its own. A win lowers your assessed value and your bill. It does not automatically change how neighboring homes are assessed. If an assessor's model is systematically off across a neighborhood, a pattern of successful appeals can trigger a broader review, but that is a side effect, not something you need to plan around.

What is a settlement statement and where do I find mine?

For homes closed after October 2015, it is called a Closing Disclosure, the five-page form your lender or title company issued at closing ^[11]. For older deals, it may be a HUD-1 Settlement Statement. Your title company keeps the original and can reissue it. Your mortgage lender holds a copy too. The form shows the purchase price, the parties, and the closing date.

How long does a property tax appeal typically take?

An informal review by the assessor's office often lands within 30 to 90 days of filing. A formal board hearing can run 6 to 18 months depending on the county's backlog. Tax court takes longer still. Most purchase-price appeals settle at the informal stage, so a clean case usually runs 60 to 120 days from filing to outcome.

Can I appeal if I bought the home a few years ago, not recently?

You can still appeal, but your purchase price carries less weight. The assessor can argue the market moved since your sale. You will need current comparable sales to anchor the appeal, either instead of or alongside your closing price. Pull sold comps from the past 6 to 12 months in your neighborhood and lead with those.

Do I need a professional appraisal to appeal?

Not for a purchase-price appeal. Your closing disclosure plus comparable sales from public records or the MLS carry most informal and board-level hearings. A licensed appraisal costs $300 to $600 and makes sense only when the stakes are high (a large commercial property or a big residential overassessment) or when the case escalates to tax court.

What if I bought the house at a foreclosure auction?

Foreclosure auction sales generally do not count as arm's-length, because the seller (the lender) acts under legal compulsion, not free negotiation. Assessors routinely set them aside. If you bought at auction, build your appeal around current comparable sales rather than your purchase price. An independent appraisal can help too.

Can I appeal if I inherited the property instead of buying it?

Yes. Inherited properties often trigger a reassessment at the transfer date, and that value can be wrong. Without a purchase price to lean on, you rely on comparable sales and, if needed, a professional appraisal. Some states, California among them, exclude certain family transfers from reassessment; look up your state's inheritance and transfer rules before assuming a full reassessment applies.

What is the success rate for property tax appeals?

Aggregate success rates are hard to pin down because most counties do not publish outcomes by evidence type. The Lincoln Institute of Land Policy, which tracks appeals broadly, notes that appeal and success rates swing wildly by jurisdiction. Practitioners widely report that purchase-price appeals with a recent, arm's-length sale succeed at much higher rates than appeals built on comps alone.

Will an appeal raise my assessment if the board thinks my home is worth more?

In theory, some states let assessors counter-appeal or raise a value they find underassessed. In practice, this almost never happens in residential purchase-price cases. Most state statutes bar the assessor from increasing your value during your own appeal. Check your state statute, but do not let a theoretical risk stop you from filing a well-supported case.

Do I owe taxes while my appeal is pending?

Yes. Pay your bill on time no matter where the appeal stands. Late payment racks up interest and penalties that usually outweigh anything you'd recover. Win, and you get a refund of the difference, sometimes with interest. Withholding payment does not protect your appeal rights and can put a tax lien on your property.

Sources

1. Lincoln Institute of Land Policy, Understanding Property Tax Assessment: Most counties reassess on a cycle ranging from annual to every several years using mass-appraisal models calibrated to aggregated sales data, not individual transactions.
2. IAAO (International Association of Assessing Officers), Standard on Ratio Studies: Many states assess at a legal fraction of market value; the taxable base is then adjusted by an equalization rate to produce uniform effective rates.
3. Lincoln Institute of Land Policy, Measuring Property Tax Inequity in U.S. Cities (2023): A 2023 Lincoln Institute analysis found systematic assessment inequality in most major U.S. cities, with lower-value homes often assessed at higher effective rates.
4. IAAO, Standard on Mass Appraisal of Real Property: An arm's-length sale requires unrelated parties, no duress, open market exposure, and both parties acting in their own interest; such sales are considered the best evidence of market value.
5. California State Board of Equalization, Assessment Appeals: California property owners generally have 60 days from the assessment notice date to file an appeal; refunds following a successful appeal are required within 60 days of a final decision.
6. Texas Comptroller of Public Accounts, Property Tax Protests and Appeals: Texas property owners must file a protest by May 15 or 30 days after the notice, whichever is later; successful appellants receive refunds within 60 days, accruing interest at 9.5% per year.
7. National Taxpayers Union Foundation, Guide to Property Tax Appeals: Comparable sales data available from county assessor portals can be used by homeowners to support their own appeal without hiring a consultant.
8. New York State Department of Taxation and Finance, Small Claims Assessment Review (SCAR): New York's SCAR program provides residential property owners a low-cost formal hearing process to challenge their assessment after informal review fails.
9. California State Board of Equalization, Proposition 13 Overview: California's Proposition 13 limits annual assessment increases to 1% for existing owners but triggers reassessment at full market value upon a change of ownership.
10. IRS, Understanding a Federal Tax Lien (general reference): Unpaid property taxes accrue interest and penalties and can lead to a tax lien on the property in most jurisdictions.
11. Consumer Financial Protection Bureau, Closing Disclosure Explainer: For homes closed after October 3, 2015, the Closing Disclosure is the five-page standardized form issued at closing that documents the purchase price, parties, and settlement charges.
12. Florida Department of Revenue, Property Tax Oversight, TRIM Notice: Florida property owners have 25 days from the TRIM (Truth in Millage) notice date to petition the Value Adjustment Board.