Assessment higher than what you paid for your home: how to appeal

Last updated 2026-07-10

Why would my assessment be higher than what I paid?

Your purchase price and your assessed value are two different numbers, and the assessor isn't required to line them up. That catches a lot of new homeowners off guard.

Assessors use mass appraisal. They run a formula across every property in a jurisdiction at once, usually built on neighborhood sales data, square footage, and condition ratings pulled from a drive-by or a desktop review. Nobody walked through your house. Nobody read your closing disclosure. If the model was calibrated on a hot stretch of sales and your market has since cooled, or if it has your property's characteristics wrong, the number it spits out can easily land above what a real buyer just paid.

A few things cause the overshoot. The county may be running stale data from a reassessment cycle that closed a year or two before you bought. The model may have your home tagged with the wrong square footage, bedroom count, or condition grade. A neighbor's big renovation may have dragged your estimated value up. Or the office just got it wrong.

None of that locks you in. Most states require assessed values to reflect market value, and a recent arm's-length sale is the strongest evidence of market value there is ^[1].

Is my purchase price actually good evidence for an appeal?

Yes. In most jurisdictions it's the single best piece of evidence you have.

Property tax law in nearly every state defines "market value" or "fair cash value" as the price a willing buyer and a willing seller would agree to in an open, arm's-length deal. If you bought through a standard sale with no family tie to the seller, no distress, and no strange concessions, your closing price is a textbook arm's-length transaction. Appeal boards and courts treat that kind of sale as strong direct evidence of value ^[1].

The International Association of Assessing Officers (IAAO) sets the professional standards most state assessment offices follow. Its Standard on Ratio Studies holds that assessment-to-sale ratios should fall within 10 percent of the jurisdiction's median to be considered equitable ^[2]. So if your assessed value is 115 percent of what you paid six months ago, that ratio sits outside IAAO's accepted band. That's more than a fairness complaint. It's a standards argument you can put in writing.

Now the caveats. If you paid far below market because the sale was distressed (foreclosure, estate sale, divorce, or a relative), the assessor can argue the price isn't arm's-length and discount it. If you bought during a stretch of compressed prices and values have climbed since the assessment date, timing cuts against you. But for the ordinary homeowner who paid a normal market price and then got a notice showing more, the settlement statement is your anchor.

What is the appeal deadline and how do I find mine?

Miss the deadline and the assessment locks in for the year. This is the one step you can't undo.

Deadlines swing hard by state and sometimes by county. Most jurisdictions give you 30 to 90 days from the date printed on your assessment notice, not from when the tax bill shows up. A handful of states use a fixed annual date instead of a rolling window off the notice mailing. The table below shows representative deadlines for several large states so you can see the spread.

State	Typical appeal window	Filing body
California (Prop 13 base)	July 2 to Nov 30 filing window	County Assessment Appeals Board [3]
Illinois (Cook County)	30 days from notice or set township deadline	Cook County Assessor / Board of Review [4]
Texas	May 15 or 30 days after notice, whichever is later	Appraisal Review Board [5]
New York (most counties)	Grievance Day (varies, often 3rd Tue in May)	Board of Assessment Review [6]
Georgia	45 days from date of notice	County Board of Assessors [7]
Florida	25 days from TRIM notice mailing (usually September)	Value Adjustment Board [8]

To find your exact deadline, dig the assessment notice out of whatever pile it landed in. The notice itself usually prints the last day to file. Lost it? Call the county assessor's office or check their site. Search your county name plus "assessment appeal deadline" or "board of review filing date."

If the deadline already passed, you're not entirely out of moves. Some counties take late appeals in narrow cases (clerical error, failure to receive the notice). Texas allows a late protest for "good cause" within 125 days of the assessment date ^[5]. Call and ask. Just don't plan on it.

How do I actually file an appeal when my assessment is above my purchase price?

Filing is simpler than people expect. The work is in the evidence, not the form.

Step 1: Get the form. Most counties post the protest or appeal form on the assessor's or board of review's website. In Texas every appraisal district takes the standard Form 50-132 (Notice of Protest), and many accept an online filing through the district's portal ^[5]. In California you file a formal application with your county's Assessment Appeals Board, posted on the county site ^[3].

Step 2: Write down your grounds. Most forms ask why you think the assessment is wrong. For a purchase-price case, your grounds are usually two lines: the assessed value exceeds the market value set by a recent arm's-length sale, and you have documents to prove it. Some forms also let you claim unequal appraisal, meaning you're taxed at a higher ratio to market value than your neighbors. Claim both.

Step 3: Build your evidence packet before you submit. You want a copy of your HUD-1 or Closing Disclosure showing the sale price and date, a copy of the deed, the assessment notice, and two to five comparable sales from the past 12 months showing homes like yours that sold near what you paid. Comps are your insurance policy. The purchase price alone is strong, but comps prove it wasn't an outlier.

Step 4: Submit everything before the deadline. Use certified mail or the official online portal so you have a time-stamped receipt.

Step 5: Prepare for the hearing. Many informal hearings happen at the assessor's office before any formal board hearing. Bring printed copies of everything. Keep it tight: state your purchase price, the assessment date, and the assessed value, then show the gap. Let the numbers talk.

Cook County homeowners should know the cook county tax assessor tax bill process runs separate filing windows for the Assessor's office and the Board of Review, and which window applies to your township matters a lot. Texas homeowners in Bexar County can find county-specific filing details at bexar county tax assessor.

How do I find comparable sales to support my appeal?

Comps are sales of similar homes near yours that closed around the same time at prices in line with what you paid. They do two jobs: they confirm your purchase price wasn't a fluke, and they give you an independent basis to argue for a lower value even if the assessor pushes back on using your own sale.

You want homes that are genuinely similar. Within roughly 15 to 20 percent of your square footage, same general property type (single-family, townhome), same neighborhood or a comparable one, and ideally sold within the 12 months before your assessment date. Three to five comps is the sweet spot. One looks cherry-picked. Fifteen looks desperate.

Where to find them without hiring an agent:

Zillow and Redfin both show recent sold data with address, price, and basic specs. Not perfect, but a fine starting point. Open the actual listing to confirm square footage and condition.

Your county assessor's website or property records portal often lets you search or download sales by neighborhood. This is the same data the assessor used, so it carries weight when you hand it back to them.

The Multiple Listing Service (MLS) is the gold standard. You reach it through a licensed agent or, in some states, through public records tied to the appraisal district.

Once you have your comps, build a simple table: address, square footage, sale date, sale price, price per square foot. Run the same math on your home using your purchase price. If your price per square foot sits at or below the comp average, that's your argument.

What if the assessor argues my sale wasn't arm's-length?

This is the main counterargument you'll hear, so be ready for it.

An arm's-length sale is one between unrelated parties, neither under duress, both with enough time and information to negotiate. If you bought from a relative, at a bank auction, or in an estate sale where the executor wanted a fast close, the assessor has a reasonable basis to discount your purchase price.

If your sale was completely standard, say so plainly. Bring the purchase contract showing the list price, the days on market, and any multiple-offer situation that proves competitive pricing. A closing disclosure showing conventional financing at market terms backs up the arm's-length status. Most MLS-listed residential sales pass this test without a fight.

If the assessor still claims your price came in below market (that you got a deal and the property is worth more), your comps carry the day. Four other homes of the same size and condition that sold for similar prices around the same time sink the "you got a deal" story fast.

What should I expect at the appeal hearing?

Most property tax appeals run through two stages: an informal review with the assessor's staff, then a formal hearing before an independent board if you don't settle first.

The informal review is often a phone call or a short in-person meeting where an appraiser looks over your documents. This is where most appeals actually resolve. In Texas, the informal hearing with the appraisal district usually happens before your scheduled Appraisal Review Board hearing, and many disputes settle right there ^[5]. In Cook County, the Assessor's office handles your first appeal and the Board of Review handles a second-level appeal if you need it ^[4].

Bring printed copies of everything, stacked in the order you'll present: assessment notice on top, then purchase documents, then comps. Keep it under five minutes. The reviewers hear dozens of cases a day. "I paid $380,000 six months ago. The assessment says $445,000. Here are three comparable sales from the same period that support a value near my purchase price" beats a ten-minute story every time.

The hearing officer or board can accept your proposed value, split the difference, or deny the appeal. If they deny, most states give you a further appeal to a state-level board or to court. Court appeals rarely pencil out for residential cases unless the tax savings are large, but the door exists.

Success rates vary. Cook County Board of Review data shows roughly 55 percent of residential appeals that reach the board end in a reduction ^[4]. Lincoln Institute of Land Policy research finds that nationally, owners who appeal with organized evidence win reductions in about 40 to 70 percent of cases, though the range across jurisdictions is wide and nobody has a clean nationwide dataset on it ^[9].

How much can I actually save if I win?

The math is simple once you know your local tax rate.

Take the gap between the assessed value and your purchase price, multiply by your jurisdiction's assessment ratio (some states assess at 100 percent of market value, others at 50 percent or some other fraction), then multiply by the effective tax rate.

Example: Your home is assessed at $450,000. You paid $380,000. Your state assesses at 100 percent of market value. Your effective tax rate is 1.2 percent.

Current bill: $450,000 x 1.2% = $5,400 per year. Reduced to purchase price: $380,000 x 1.2% = $4,560 per year. Annual savings: $840.

That $840 repeats every year until the next reassessment. In many states, reassessment runs every two to four years, so one win can save you $1,600 to $3,300 across the cycle before anyone looks at your value again.

In states with Proposition 13-style caps (California, for one), a win also sets a lower base value that limits future increases ^[3]. Over a long ownership stretch, that compounds.

Georgia homeowners run the savings math through a specific exemption and millage rate structure. The gwinnett county tax assessor and bibb county tax assessor pages walk through county-specific rates if you're in those markets.

Want to run the whole appeal yourself instead of handing a contingency firm 30 to 40 percent of the savings? The TaxFightBack appeal kit takes you through each step with jurisdiction-specific checklists and a comp-analysis worksheet you fill in once and carry to the hearing.

Should I hire a property tax consultant or do it myself?

My honest take: for a purchase-price case, do it yourself.

Contingency firms usually charge 25 to 40 percent of the first year's tax savings. On $840 of savings, that's $210 to $336 gone for work you could finish in an afternoon. The appeal form, the comp search, and the hearing are all things a homeowner with organized documents can handle. A purchase-price argument is about as clean as appeals get. You're not fighting a highest-and-best-use question on a commercial parcel.

When does professional help earn its fee? Large commercial properties where the savings justify the cut. Cases arguing construction defects or unusual conditions that need a licensed appraiser's report. Or appeals you've already lost at the informal level and are taking to court. For a standard residential appeal anchored to your own closing price, the only real cost is a few hours.

Los Angeles homeowners should note the la county property tax system has quirks around Proposition 19 transfers and supplemental assessments worth understanding before you file. In Maryland, montgomery county property tax runs a three-year assessment cycle that changes the timing math on when an appeal pays off.

What mistakes should I avoid when appealing a high assessment?

A few mistakes sink otherwise solid appeals.

Missing the deadline is the obvious one. The more common one is filing the form with no evidence behind it. A bare claim that the assessment is too high gives the board nothing to act on. Bring the documents when you file, or at the very least organize them before your hearing date.

Bad comps come next. If your comps sit in a different neighborhood, are townhomes when your home is a detached single-family, or closed six years ago, the assessor tosses them. Find genuinely similar sales. Two strong comps beat ten weak ones.

Getting adversarial at the hearing does nothing for you. The staff reviewers didn't set your assessment personally. Treat it as a negotiation, not a fight, and you'll get better outcomes. Bring a clear ask: "I'm requesting the assessed value be set at $380,000 based on my October 2024 purchase and the comparable sales attached."

Skipping your property record card is a missed shot. The assessor keeps a card or data sheet for your property with the square footage, bedroom count, condition grade, and other traits fed into the model. Most states hand it over free on request. If it says 2,400 square feet and your home is actually 1,950, you now have a factual-error argument stacked on top of the purchase-price argument. These errors turn up more often than people think.

Minnesota homeowners who want to see how the assessor builds that record can read the hennepin county property tax walkthrough of how Hennepin County structures its records.

What if I recently bought the home but the assessment date predates my closing?

Assessment dates matter, and the timing can cut either way.

Most jurisdictions value property as of a set lien date or valuation date, often January 1 of the tax year. If your purchase closed in March and the assessment was set as of the prior January 1, the assessor can argue their value reflects lien-date conditions, not your closing date. That's a legitimate procedural point. It doesn't make your purchase price useless.

Here's what it means in practice. If your market was climbing fast and you paid January-level prices by closing in March, the assessor's counter is weak. If the market dropped between January and your March closing, the assessor's January value might hold up even though it sits above what you paid. The whole question is what the market did between the assessment date and your closing.

You handle this by naming the assessment date in your appeal, presenting your sale as evidence of value "on or near the valuation date," and backing it with comps that span the January-to-closing window. If January comps also show prices near your purchase price, the timing argument falls apart.

In California, the assessment date rules tie to the Proposition 13 base year, and a change of ownership triggers a reassessment to the purchase price automatically ^[3]. So if California assessed you above what you paid on a recent purchase, that's more likely a data entry error or a supplemental assessment timing issue than a standard overassessment, and the fix may be as simple as filing a Request for Reappraisal with proof of the purchase.

What if I lose the appeal? What are my next steps?

Losing at the informal or first-level board hearing isn't the end.

Every state gives you at least one more level of review. In most, you can appeal from the local board to a state-level board or administrative tribunal. Illinois, for instance, routes appeals first to the county board of review and then to the Illinois Property Tax Appeal Board before court ^[10]. Once you've exhausted administrative remedies, you generally have the right to file in state court, though court is slow and expensive for most residential cases.

The more useful next step after a first-level denial is to re-examine your evidence. Were your comps strong? Did you pull your property record card and check for data errors? Sometimes a denial at the informal stage means the reviewer was following policy, not weighing the merits, and a formal board hearing with a sharper packet lands differently.

If you lose at the formal board and the numbers still don't add up, file again next cycle. Assessment appeals are an annual right in most states. Markets move, and in a cooling market, an assessment that survived this year can be plainly wrong next year. Some owners who lost their first appeal won the following year with fresh comps from a softer market.

After it's resolved, keep the record. If you win a reduction, confirm the new assessed value shows up on your next tax bill. Posting errors happen. The TaxFightBack appeal kit includes a follow-up checklist for exactly that step.

Frequently asked questions

Can I appeal my property tax assessment if I just bought the house?

Yes. A recent arm's-length purchase is strong grounds for an appeal, because the sale price is direct market evidence of value. File within your jurisdiction's appeal window measured from the assessment notice date. Bring your closing disclosure, deed, and comparable sales. Most appeal boards give recent purchase prices real weight as evidence of fair market value.

How long do I have to appeal a property tax assessment?

Deadlines range from 25 days (Florida's TRIM notice window) to 90 days or more depending on state and county. Texas gives you until May 15 or 30 days after the notice, whichever is later. New York municipalities use a fixed Grievance Day. Check your assessment notice for the printed deadline; that date governs, not when the mail arrived.

What documents do I need to appeal a property tax assessment that's higher than my purchase price?

At minimum: the assessment notice, your HUD-1 or Closing Disclosure showing the sale price and date, a copy of the deed, and two to five comparable sales of similar homes that closed around the same time for similar prices. Also request your property record card from the assessor before the hearing to check for data errors like incorrect square footage.

What percentage of property tax appeals are successful?

Success rates vary by county and evidence quality. Cook County Board of Review data shows roughly 55 percent of residential appeals that reached the board resulted in a reduction. Lincoln Institute of Land Policy research puts the national range at about 40 to 70 percent for appeals filed with organized documentation. Appeals grounded in a recent purchase price tend to land at the stronger end.

Will the assessor raise my value if I appeal and lose?

In most states, no. Most appeal processes are one-directional: the board can lower or confirm the value but cannot raise it beyond the original assessment because you appealed. Verify this in your specific jurisdiction's rules before filing, but for the large majority of U.S. counties this protection exists.

What is an arm's-length sale and why does it matter for my appeal?

An arm's-length sale is a transaction between unrelated, uncoerced parties with enough time to negotiate, which is what most standard home purchases are. It matters because property tax law defines market value as what a willing buyer and seller agree to under exactly those conditions. An arm's-length purchase price is the most direct evidence of market value, which is what your assessed value is supposed to reflect.

Can I appeal if I bought the home as-is or at a discount?

It depends on why you got the discount. A price cut for cosmetic issues or dated finishes is still arm's-length; the condition is part of the value. But if you bought a foreclosure, an estate sale, or from a relative, the assessor can argue the sale wasn't arm's-length and give your price less weight. Your comparable sales become more important as supporting evidence in those cases.

Does a property tax appeal affect my mortgage escrow payment?

Yes, if you win. Your mortgage servicer adjusts your escrow account each year based on the projected tax bill. A successful appeal that lowers your assessed value lowers your property tax bill, which should reduce your escrow payment at the next annual escrow analysis. Some servicers refund the overage; others apply it as a credit to future escrow installments.

How do I find comparable sales to use in my property tax appeal?

Start with Zillow or Redfin sold listings, filtered to your neighborhood, property type, and the 12 months before your assessment date. Your county assessor's property records portal often has downloadable sales data too. Look for homes within about 15 to 20 percent of your square footage, same type, similar condition. Three to five genuinely similar sales is enough; more isn't better if the extras are weak matches.

What is a property record card and how do I get one?

A property record card is the assessor's internal data sheet for your home. It lists the traits used in the assessment model: square footage, bedroom and bathroom count, lot size, age, condition grade, and any outbuildings. You can request it from the assessor's office, often free. Errors on this card, like the wrong square footage, are a separate and often overlooked basis for appeal.

Do I need a lawyer or appraiser to file a property tax appeal?

For most residential appeals, no. The forms are built for self-filing, hearings are informal, and a purchase-price argument with a closing disclosure and comps is straightforward to present. A licensed appraiser's report adds weight if your case is complex or headed to court, but for a standard first-level appeal it usually isn't worth the cost of the appraisal.

What happens if I miss the property tax appeal deadline?

In most states the assessment becomes final and you lose the right to appeal for that tax year. Some counties take late filings under narrow exceptions, such as failure to receive the notice or a documented clerical error. Texas allows a late protest for good cause within 125 days of the assessment date. Call your assessor's office right away if you've missed the deadline; the answer varies by jurisdiction.

How many years does a successful appeal affect my taxes?

That depends on your state's reassessment schedule. If your county reassesses every year, you benefit for one year and then appeal again if needed. If your county reassesses every two to four years, one win can lock in a lower base value for the whole cycle. California's Proposition 13 structure makes a base year reduction especially valuable because it caps annual increases at 2 percent.

Can I appeal if I think my neighbors are assessed lower than me for similar homes?

Yes. This is called an unequal appraisal or equity appeal, and it's a separate legal ground from market value in many states. Texas explicitly allows unequal appraisal appeals under Tax Code Section 41.43. Even where it isn't separately codified, showing that similar neighboring properties are assessed at much lower values per square foot strengthens any appeal. You can assert both grounds at once.

Sources

1. International Association of Assessing Officers (IAAO), Standard on Mass Appraisal of Real Property: Market value in mass appraisal is defined as the price in an arm's-length transaction; recent sales are treated as direct evidence of market value.
2. International Association of Assessing Officers (IAAO), Standard on Ratio Studies: IAAO standards hold that assessment-to-sale ratios should fall within 10 percent of the median for a jurisdiction to be considered equitable.
3. California Board of Equalization, Publication 29: California Property Tax, An Overview: Under Proposition 13, a change of ownership triggers reassessment to purchase price; the formal appeal window runs July 2 through November 30 filed with the county Assessment Appeals Board.
4. Cook County Assessor's Office, Appeals Information: Cook County residential appeals must be filed within 30 days of the notice or the set township deadline; approximately 55 percent of appeals that reach the Board of Review result in a reduction.
5. Texas Comptroller of Public Accounts, Property Taxpayer Remedies: Texas protest deadline is May 15 or 30 days after the notice, whichever is later; late protests for good cause are allowed within 125 days of the assessment date; unequal appraisal appeals are authorized under Tax Code Section 41.43.
6. New York State Department of Taxation and Finance, How to Contest Your Assessment: Most New York municipalities hold a fixed Grievance Day (often the third Tuesday in May) as the deadline to file with the Board of Assessment Review.
7. Georgia Department of Revenue, Property Tax Appeal Process: Georgia property owners have 45 days from the date of the assessment notice to file an appeal with the county Board of Assessors.
8. Florida Department of Revenue, Property Tax Oversight: Taxpayer Rights: Florida property owners have 25 days from the mailing of the TRIM (Truth in Millage) notice, typically in September, to file with the Value Adjustment Board.
9. Lincoln Institute of Land Policy, Pathways to Property Tax Reform: Research indicates that property owners who appeal with organized evidence win reductions in roughly 40 to 70 percent of cases, though jurisdiction-level variation is wide and no clean nationwide dataset exists.
10. Illinois Department of Revenue, Property Tax Assessment Appeals: Illinois provides for appeal first to the county board of review and then to the Illinois Property Tax Appeal Board before court recourse.