How to appeal a property tax assessment on a new build

Last updated 2026-07-09

Why are new builds so often over-assessed?

Your new build has no sales history, so the assessor guesses. Most counties fall back on a cost approach: add land value to the depreciated cost of rebuilding the structure from scratch. That method has a known flaw. It measures what the house cost to build, not what a buyer would actually pay for it right now.

In a market where builder prices have softened, or where nearby resales trade below replacement cost, the cost approach almost always spits out a number that's too high. A 2023 Lincoln Institute of Land Policy report found that newly constructed residential properties rank among the most frequently over-assessed property classes in the country, largely because of this gap between cost and market. ^[1]

There's a second problem specific to new subdivisions. Assessors sometimes finish their valuation before the neighborhood sells out. They anchor on the builder's original list price rather than actual closing prices, and closing prices are often lower thanks to builder incentives, rate buydowns, and discounts on the last lots. Those concessions cut the true market value of your home. The assessor never sees them unless you show the data.

What is the deadline to appeal a new build property tax assessment?

This is the one thing you cannot get wrong. Miss the deadline and you pay the inflated bill for the whole tax year, sometimes longer. Most windows run 30 to 90 days from the date your assessment notice goes out.

Deadlines vary sharply by state. A few states tie the deadline to a fixed calendar date no matter when your notice arrives. The table below covers the states where new construction disputes come up most.

State	Deadline trigger	Typical window
California	Prop 8 decline-in-value period or regular roll, July 2 to Nov 30 annually [2]	Open season, but Prop 13 base-year appeal is within 60 days of notice
Texas	Notice of appraised value mailed (typically April)	By May 15 or 30 days from notice, whichever is later [3]
Illinois (Cook County)	Assessment notice publication	30 days from publication date [4]
Georgia	Annual assessment notice	45 days from notice date [5]
New York (outside NYC)	Tentative roll (May 1 in most jurisdictions)	By Grievance Day, typically 3rd Tuesday in June [6]
Florida	Assessment notice (TRIM notice, August)	25 days from TRIM notice [7]
New Jersey	October 1 assessment date	January 15 to April 1 of tax year

The clock usually starts the day your notice is mailed, not the day you open it. Read the notice for the exact date. If you bought a new build and never got a formal assessment notice because the county hadn't finished the parcel record, call the assessor's office right away and ask when the clock starts for your parcel. Some jurisdictions allow a late appeal in that exact situation.

Big metro counties complicate this. In Cook County, Illinois, the appeal windows rotate by township, so your neighborhood may open on a different schedule than the one a few miles over. The cook county tax assessor tax bill process shows how township schedules catch homeowners off guard.

What documents do you need before you file?

Walk in with the right paperwork and your case is half won. Show up empty-handed and you get a polite denial. Gather this before you touch the appeal form.

1. Your closing disclosure (CD). This is the strongest document in a new build appeal. The CD shows exactly what you paid, including seller concessions, builder buydowns, and credits. Assessed value has to reflect market value, and your closing price is direct market evidence. If the assessment tops your closing price by more than a few percent, that gap alone often wins.

2. The assessment notice itself. You need the parcel number, the land value versus improvement value split, and the total assessed value. The split matters. Sometimes the land is fine and the improvement value is inflated, or the reverse.

3. The builder's purchase agreement. This shows incentives: free upgrades, mortgage rate buydowns, closing cost credits. Each one cuts your effective price. An assessor who uses the base list price without backing out concessions is overstating market value.

4. Comparable sales (comps). Pull three to six sales of similar new builds in your subdivision or nearby ones that closed in the past 12 months. Match square footage, lot size, age, and finish level. You want homes that sold, not homes sitting on the market. MLS data, Zillow sold listings, or your county's recorded deed data all work.

5. Your property record card from the assessor's website. Check square footage, bedroom count, bathroom count, garage size, and lot dimensions. Data entry errors on new parcels are common and easy to argue.

Found a factual error on the record card? You can often get a quick administrative correction without a formal hearing. Start there.

How do you find and use comparable sales for a new build appeal?

Comps are the backbone of the market value argument. For a new build, the best comps are other new builds in your subdivision that closed recently, because they share your floor plans, finishes, and incentives. Same builder, same product, lower closing price. That's the comp you want.

Not enough sales in your subdivision yet? Expand to the closest comparable community. Keep the radius tight, no more than one to two miles in suburban markets, and match age within a year or two. New construction depreciates differently than a 15-year-old house, and a hearing officer will throw out a comp that mixes vintages.

For each comp, record the address, sale date, sale price, square footage, price per square foot, lot size, and any known concessions. Put it in a plain table you can hand across the table.

Here's the argument in one shape: your assessed value implies X per square foot, the market shows comparable homes sold at Y per square foot, and the assessment overstates value by Z dollars. Keep it that clean.

Where to pull closed sales for free: your county assessor's website usually has a deed search or sales verification tool. Zillow and Redfin both show sold prices. Texas central appraisal districts (CADs) publish sales data on their public portals. The National Association of Realtors notes that comparable sales within the prior 12 months carry the most weight in residential valuation disputes. ^[8]

California is a special case. The base-year value set at purchase is generally your best protection under Proposition 13. If the county sets a base year above your actual purchase price, that's a direct statutory error worth appealing. The California State Board of Equalization publishes guidance on base-year value challenges. ^[2]

How do you actually file the appeal?

The form differs by county. The mechanics are the same almost everywhere.

Step 1: Get the correct form. Most counties post the appeal or protest form on the assessor's or appraisal review board's site. In Texas it's Form 50-132, the Notice of Protest, filed with your county appraisal review board. ^[3] In Florida you file a Petition to the Value Adjustment Board. In most other states it's a generic appeal form from the county board of equalization or assessment appeals board.

Step 2: State your grounds clearly and briefly. You're disputing market value. Your evidence is your actual purchase price, the builder concessions that cut your effective price, and recent comparable sales supporting a lower number. One sentence per point. No novels. Hearing officers process dozens of cases a day.

Step 3: Attach your evidence. Closing disclosure, comps table, any record card error documentation. Keep it under 20 pages unless your situation is genuinely complicated.

Step 4: File by the deadline. Mail it certified with tracking, or e-file if your county offers it. Keep a copy of everything.

Step 5: Prepare for the informal hearing. Many counties offer an informal review before the formal date. Take it. Bring your closing disclosure and three best comps. A calm, organized ten minutes often settles the case right there.

In Texas, Georgia, and Florida, a large share of new build protests settle at the informal level. Assessors know the cost approach is weak, and they negotiate when a homeowner shows up with a clean closing disclosure. The formal hearing is your fallback if the informal offer isn't fair.

Don't want to build the packet from scratch? The TaxFightBack DIY appeal kit walks you through each form and the comp table with state-specific instructions, and you keep 100% of whatever reduction you win.

What arguments work best in a new build appeal hearing?

Lead with your purchase price. Nearly every state requires property to be valued at fair market value, defined as the price a willing buyer pays a willing seller with full information and no pressure. Your closing was exactly that transaction. It's the cleanest evidence of market value you can bring.

The International Association of Assessing Officers (IAAO) Standard on Mass Appraisal treats the assessment-to-sale-price ratio as the main accuracy measure for residential assessments. ^[9] When your assessment tops 100% of your sale price, the assessor is missing the standard they're supposed to hit.

Second argument: builder concessions. Assessors often use the base contract price and ignore $10,000 to $30,000 in rate buydowns, closing cost credits, or free upgrades. Those are real dollars that cut the buyer's effective cost. Bring the closing disclosure and point to the net proceeds. That net figure, not the base list price, is your true market value.

Third argument: comparable sales. Even if the assessor resists the purchase price on procedural grounds, three or four closed comps at a lower price per square foot is hard to wave away. Lay them in a table: address, sale date, square footage, sale price, price per square foot. Show that your assessment implies a price per square foot none of the comps support.

Skip the emotional pitch. "I can't afford this bill" moves nothing. "My assessed value of $485,000 tops my actual purchase price of $452,000 by 7.3%, and four comparable new builds in this subdivision sold between $441,000 and $461,000" is the kind of sentence that wins.

In Georgia, the gwinnett county tax assessor office posts its appeal procedures online, including what evidence it accepts at hearings. County-specific detail like that matters when you prep.

What if the assessor used the wrong square footage or property details?

This happens constantly on new builds. The assessor's data comes from building permits and developer plans, and those numbers don't always match the finished house. Common errors: recorded square footage runs too high (the permit counted an unfinished basement now logged as finished living space), phantom bathrooms, or lot size pulled from a preliminary plat that differs from the recorded survey.

Pull your property record card from the assessor's public portal and compare it against your closing documents, builder floor plan, and survey. A discrepancy over roughly 50 square feet in living area is worth chasing. At $100 to $200 per square foot in assessed value, a 100-square-foot error adds $10,000 to $20,000 to your assessment, which runs about $100 to $300 a year in extra tax depending on your rate.

For plain factual errors, many counties have an informal correction process that beats a formal appeal on speed. Call the assessor's office, explain the discrepancy, and ask about an administrative correction. Bring your survey and the builder's floor plan. If they fix it before the notice deadline, you may never need to file a protest.

Won't fix it administratively? Note the specific error on your appeal form as a separate ground: "The property record card overstates living area by 137 square feet, as documented by the attached survey and closing disclosure." That precision helps even while you also argue market value.

Can you appeal the land value separately from the building value?

Yes, and sometimes the land is where the real overage hides. On a new build, assessors often set land value from raw lot prices earlier in the development, before the builder's lot premiums deflated or the market cooled. Buy a lot in phase 3 of a subdivision where phase 1 lots carried a $30,000 premium that no longer exists, and your land value may be overstated by exactly that amount.

Check whether your closing disclosure shows a separate land value. Some builders split the purchase price between land and structure in the contract. If yours does, that allocation is evidence. If it doesn't, argue from what nearby vacant lots are selling for right now.

In big metro markets like Los Angeles, the land-versus-improvement breakdown is public record. The los angeles county property tax office publishes assessment roll data showing how the county splits land from improvement value on comparable parcels. That's useful evidence when your land allocation looks out of line.

California raises the stakes here. Proposition 13 caps future increases at 2% a year once the base year is set, so getting the initial base-year land value right matters more than it does in most states. ^[2]

What happens after the appeal hearing?

You get a written decision by mail, usually within a few weeks to a few months depending on the county's caseload. Texas appraisal review boards must issue a written order through the hearing process. ^[3] Florida value adjustment boards must issue written decisions within 20 days of the final hearing. ^[7]

Win, and the assessor adjusts your value and recalculates your bill. Depending on timing, you get a corrected bill, a refund of overpaid taxes, or a credit toward a future installment.

Win partially, meaning you got a reduction but not the full amount you asked for, and you decide whether the gap is worth escalating. Your next step is usually a second-level administrative appeal (board of equalization, state tax court, or similar) or a judicial appeal in district court. Judicial appeals cost filing fees and possibly attorney fees, so they only make sense when the dollars are real, generally when the remaining over-assessment costs you more than a few hundred dollars a year.

Lose entirely, and the usual reasons are thin comp evidence, comps that are too old or too different, or missing builder concessions. Note the deadline for next year's appeal, sharpen your evidence package, and try again. Some over-assessments hang around for multiple years on new builds while the assessor recalibrates the subdivision's mass appraisal model to actual sales.

Are there exemptions that lower your new build's taxable value regardless of assessment?

Yes, and they stack on top of your appeal. These cut taxable value whether or not you win the valuation fight.

The homestead exemption is the big one. Most states reduce the taxable value of your primary residence by a fixed dollar amount or percentage. Texas offers a $100,000 homestead exemption from school district taxes starting in 2023. ^[3] Georgia offers a basic $2,000 homestead exemption from county taxes plus additional local exemptions in many counties. ^[10] Florida's homestead exemption is $25,000 on the first $50,000 of assessed value, plus another $25,000 on assessed value above $50,000 for non-school taxes. ^[7]

The catch on new builds: you have to apply. It's not automatic. The deadline usually falls between January 1 and April 1 of the tax year you want it for. Close on your new build in October and forget to file a homestead application by the following April 1, and you lose that year's exemption. File right after closing.

Other exemptions worth checking: first-time homebuyer programs in some states and counties, veteran exemptions if you qualify, and any new-construction tax abatement your municipality offered as a development incentive. Some new subdivisions sit inside a tax increment financing (TIF) district or special assessment district that changes your effective rate. Read your closing documents. Those obligations should have been disclosed at closing.

In the DC suburbs, the montgomery county property tax system has several credit programs beyond the basic homestead credit that new homeowners keep missing.

Is it worth doing this yourself or should you hire someone?

For most new build appeals, do it yourself. The evidence is unusually clean, so you're not the target market for a contingency firm.

You already hold the strongest documents. A recent closing disclosure shows market value directly. A purchase agreement shows the concessions. A subdivision full of similar homes gives you comps. This is not a case where you need to spend $400 to $600 on a formal appraisal. The paperwork in your closing file is stronger than anything an appraiser would produce.

Contingency firms typically charge 25% to 50% of first-year tax savings. On a $500 reduction, that's $125 to $250 out of your pocket for maybe four hours of work you could do yourself. These firms earn their fee on complex cases, on properties that need a formal appraisal, or on commercial deals where the income approach takes real expertise.

A standard new build residential appeal asks for four skills: read your closing disclosure, pull three comps from the county portal or Zillow sold listings, fill out the protest form accurately, and show up organized. Anyone who can follow a checklist can do that.

The TaxFightBack DIY appeal kit has state-specific forms, a comp table template, and a checklist matching the steps in this article. You keep everything you save.

The one time hiring help makes sense on a new build: your county's formal appeal requires a certified appraisal, or you're escalating to tax court. At that level a property tax attorney or licensed appraiser adds real value. Most residential new build appeals never get there.

What if your new build was assessed mid-year or before construction finished?

This is a common headache. A county may assess your parcel while construction is still going, capturing the land plus a partial improvement value. Then the final assessment lands after completion, and you get hit with a retroactive bill or a much higher value.

Most states have rules for mid-year assessments on new construction. California uses a prorated base-year value when construction finishes mid-year, assessed as of the completion date and prorated for the remaining months of the fiscal year. The California State Board of Equalization publishes guidance on this. ^[2]

Get an assessment on an incomplete structure that assigns value to features that aren't finished? Document the construction status with dated photos and the builder's completion certificate. That's grounds to challenge the improvement value head-on.

For counties that assess annually, one question runs the whole argument: what was the property's condition on the statutory valuation date? In most states that's January 1. If your home was a concrete slab on January 1 and a finished house by March, your assessment for that tax year should reflect the January 1 condition, with the full improvement value starting the following year. Plenty of assessors get this wrong on new builds, so check it.

Texas uses January 1 as the appraisal date. ^[11] Georgia uses January 1. Florida uses January 1. If you closed in March and the assessor hit you with a full-year assessment on a house that wasn't finished on January 1, that's a procedural argument worth raising in your protest.

Frequently asked questions

How long does a new build property tax appeal take?

Informal reviews often resolve in four to eight weeks. Formal hearings before an appraisal review board or board of equalization typically run two to six months depending on the county's caseload. Texas requires appraisal review boards to hear protests within a set window after the filing deadline. Florida value adjustment boards often stretch into the fall. Budget for six months from filing to final decision if you go the formal route.

Does my closing price automatically override the assessor's value?

It's strong evidence but not automatic. Most states treat a bona fide arm's-length sale as the best evidence of market value, and assessors are expected to give it serious weight. If the assessor believes your transaction wasn't arm's-length, or if builder incentives distort the headline price, they can argue around it. Documenting that your sale was arm's-length and showing the net-proceeds figure from your closing disclosure strengthens the argument.

What if my new build's assessed value is below my purchase price?

That's a favorable outcome for you. Assessed value below market value means you're paying less tax than full market value would require. Don't file an appeal in that situation. The system is working in your favor. The only reason to call the assessor is a factual error on your record card, not a value discrepancy that benefits you.

Can I appeal if I already paid my tax bill?

Yes, in most states. Paying does not waive your right to appeal. Win a reduction after paying, and you typically get a refund or a credit toward your next installment. File by the appeal deadline regardless of whether you've paid. Some states require a timely appeal even if you plan to pursue a refund claim later, so don't wait.

Do I need a licensed appraiser to file a new build appeal?

Not for an informal or formal administrative hearing in most states. Your closing disclosure, purchase agreement, and comparable sales data are usually enough. A formal certified appraisal ($400 to $600 from a licensed appraiser) adds credibility in contested cases and is required if you escalate to tax court in some states. For a straightforward new build where your purchase price sits below assessed value, you almost certainly don't need one.

What is the success rate for appealing a new build property tax assessment?

Nobody tracks this specifically for new builds nationally, and state-level data is inconsistent. The Lincoln Institute of Land Policy found that new construction properties rank among the most frequently over-assessed classes, which implies appeals carry above-average merit. Texas reports that a large majority of protests filed with evidence get some reduction at the informal level. Your odds climb when your purchase price sits below assessed value and you bring recent comparable sales.

Can I appeal every year, or just the first year?

You can file every year in most states, as long as you meet that year's deadline. If your new build gets corrected in year one but values rise again in year two, protest again. States like Texas and Georgia allow annual protests. California's Proposition 13 limits annual assessment increases to 2% after the base year is set, so the first-year base-year value appeal is often the one to get right.

What if my neighborhood is still under construction and there aren't many comparable sales yet?

Use what's available: any completed sales in your subdivision, any sales in the nearest comparable subdivision, and your own closing price. Thin comp data actually supports your point that the assessor's valuation is speculative rather than market-based. You can also request the assessor's own comp data under public records laws in most states. Their comps often turn out to be larger, older, or on premium lots that don't fairly compare to yours.

Will filing an appeal cause the assessor to raise my value?

In most states, an appeal cannot push your value above the original assessment, provided you filed on time. Texas statute prohibits the appraisal review board from raising your value above the appraisal district's original determination when you're the party initiating the protest. A few states technically allow an increase in rare cases, usually only when a factual correction shows the original was too low. Check your state's rules before filing.

Do builder incentives really affect my assessed value?

Yes, and most assessors ignore them unless you raise them. A $15,000 rate buydown that lowered your monthly payment didn't lower the headline sale price, but it's a real concession that cuts the effective transaction value. The IAAO standard for residential valuation calls for adjusting comparable sales for concessions. Your closing disclosure itemizes these. Present them explicitly and quantify the adjustment they imply to your effective purchase price.

What if my state requires the appeal to go through a third-party board, not the assessor directly?

File with whatever body has jurisdiction. In Texas it's the county appraisal review board. In New York it's the local board of assessment review. In California it's the county assessment appeals board. In Florida it's the value adjustment board. The process is the same: file by the deadline, present evidence, attend your hearing. The third-party structure actually helps you, since the hearing officer isn't the person who set your value.

Can I appeal just the land value on my new build?

Yes. You can challenge the land value, the improvement value, or both. If the land looks correct but the structure is over-assessed (or the reverse), say so explicitly on your appeal form. Assessors often over-allocate to improvements on new construction because they use replacement cost data, while land value tends to be more defensible. Check comparable lot sales and the land-to-improvement ratio on similar assessed parcels near you.

Is there a fee to file a property tax appeal?

Most administrative-level appeals (protest forms, informal hearings, board hearings) are free to file. Some states charge a small filing fee for formal board hearings, typically $15 to $30. Judicial appeals in state tax court carry standard court filing fees, which vary by state and case complexity. There's no contingency fee when you file yourself, which is the main cost advantage over hiring a protest firm.

How do I find my property record card to check for errors?

Search your county assessor's website for a property search or parcel lookup tool. Enter your address or parcel number. The record card (sometimes called an appraisal card or property data sheet) lists the characteristics the assessor used: square footage, bedroom and bathroom counts, garage size, lot dimensions, and year built. Compare every field against your closing documents and builder floor plan. Square footage errors are the most common and highest-impact mistakes on new builds.

Sources

1. Lincoln Institute of Land Policy, 'Measuring the Fairness of Property Assessments' (2023 research): Newly constructed residential properties are among the most frequently over-assessed property classes in the United States due to reliance on cost-approach valuation.
2. California State Board of Equalization, Property Taxes information: California allows Proposition 13 base-year value appeals within 60 days of notice, and prorates new construction assessments when completion occurs mid-year; the July 2 to November 30 window applies for decline-in-value claims.
3. Texas Comptroller of Public Accounts, Property Tax information: Texas property owners must file a Notice of Protest (Form 50-132) by May 15 or 30 days from the appraisal notice, whichever is later; homestead exemption is $100,000 from school district taxes; ARB cannot raise value above the original appraisal district determination when the property owner initiates protest.
4. Cook County Assessor's Office, Appeals information: Cook County assessment appeals must be filed within 30 days of the assessment publication date, with windows rotating by township.
5. Georgia Department of Revenue, Property Tax information: Georgia property owners have 45 days from the annual assessment notice date to file an appeal; January 1 is the valuation date.
6. New York State Department of Taxation and Finance, Contest Your Assessment information: In most New York jurisdictions outside NYC, the appeal deadline is Grievance Day, typically the third Tuesday in June, with the tentative roll posted May 1.
7. Florida Department of Revenue, Property Tax information: Florida property owners have 25 days from the mailing of the TRIM notice to petition the Value Adjustment Board; homestead exemption is $25,000 on the first $50,000 of assessed value plus an additional $25,000 on assessed value above $50,000 for non-school levies; January 1 is the assessment date; value adjustment boards must issue written decisions within 20 days of the final hearing.
8. National Association of Realtors, Appraisals and Valuation information: Comparable sales within the prior 12 months carry the most weight in residential valuation disputes.
9. International Association of Assessing Officers (IAAO), Standard on Mass Appraisal of Real Property: The IAAO Standard on Mass Appraisal defines the assessment-to-sale-price ratio as the primary accuracy measure for residential assessments, and calls for adjusting comparable sales for concessions in residential valuation.
10. Georgia Department of Revenue, Homestead Exemptions information: Georgia offers a basic $2,000 homestead exemption from county taxes with additional local exemptions available in many counties.
11. Texas Comptroller, Property Tax Basics guidance: Texas uses January 1 as the annual appraisal date; property condition and ownership on that date determines the assessment for that tax year.