What evidence do assessors actually accept in appeal hearings

Last updated 2026-07-11

Why does the type of evidence you bring actually matter?

Here's the assumption that sinks most appeals: homeowners think the assessor has to prove the value is right. Backwards. In most states, once the assessor issues a value, that number carries a legal presumption of correctness, and you have to overcome it.

Illinois writes this into 35 ILCS 200/16-185, which makes the board of review's determination prima facie correct and puts the burden on the taxpayer. ^[1] Texas Property Tax Code Section 41.43 does the same: the appraisal district's value is presumed correct unless the taxpayer offers evidence that outweighs it. ^[2]

That presumption is why thin evidence loses by default. A hearing officer who is tired and behind schedule will do nothing with a vague argument. Bring the right documents and the room tilts your way, legally and psychologically.

There's a second reason quality matters. Most appeal bodies are boxed in by law on what they can even consider. A board of equalization cannot cut your value because you think taxes are too high. It can only act when the evidence shows the assessed value exceeds market value or breaks the uniform-and-equal standard. Know that walking in the door.

What are comparable sales and why do hearing officers want them most?

Comparable sales, called comps, are arm's-length sales of similar properties that closed before your jurisdiction's appraisal date (usually January 1 of the tax year). They're the gold standard because mass appraisal systems run on the same sales data. When you find sales that were in the system and the model still overvalued your house, that's direct proof the model missed on your specific property.

A strong comp set has three to five sales from the last twelve months (some jurisdictions allow up to twenty-four), within a mile if you're in a suburb, same property type, within 20% of your square footage, same number of stories, similar lot. Pull them from your county assessor's own sales database, from Realtor.com, or from a licensed agent who can run an MLS search for you.

Present them in a plain grid: address, sale date, sale price, square footage, price per square foot, and the adjustments you made for differences. If your comps average $185 per square foot and the assessor has you at $215, show that math on one line. Hearing officers are not appraisers. Clear arithmetic wins.

One mistake trips up a lot of people: using active listings or pending sales. Those show what a seller hopes to get, not what a buyer paid. Only closed sales count. ^[3]

If you're in Cook County, the assessor's office publishes its own sales ratio studies, and you can sometimes turn the county's own numbers against it. The Cook County Assessor posts annual sales data you can download straight from the portal. ^[4]

Does an independent appraisal help or is it overkill for residential appeals?

An independent appraisal from a licensed or certified residential appraiser is the most persuasive single document you can bring. It also costs $400 to $700 for a typical single-family home and takes two to three weeks to schedule. ^[5] For a lot of residential appeals, that cost only makes sense when your assessed value is high enough that a reduction saves you more than the appraisal fee.

Here's the rule I'd use. If your likely tax savings over two years beat the appraisal cost by two to one or more, get the appraisal. Take a $600,000 assessed home in a jurisdiction with a 1.2% effective rate. A $50,000 reduction saves about $600 a year, so $1,200 over a two-year cycle. A $500 appraisal pays for itself with room to spare.

Boards give appraisals real weight because they're prepared by credentialed professionals under USPAP (Uniform Standards of Professional Appraisal Practice) and hold up in court. ^[6] If your board hearing fails and you push on to district or circuit court, an appraisal stops being optional.

For a modest overassessment, three or four well-picked comps on a clean one-page grid usually do the same work for free. Spend the money on an appraisal when your property has unusual features, when the gap between your value and the assessor's is large, or when you expect to litigate.

What physical condition evidence actually moves the needle?

Assessors assume average condition for the age of the house unless you prove otherwise. Photos, contractor estimates, and inspection reports are how you prove it. The key is turning condition into dollars.

Specific and dollar-quantified beats vague every time. A photo of a cracked foundation is useful. A licensed structural engineer's report saying the crack needs $28,000 in repairs is far better, because that number drops straight into a value deduction the hearing officer can write down and defend.

Document what the assessor couldn't see from the street: wet basement, failing HVAC, rotted subfloor. Document functional obsolescence too, like one bathroom in a four-bedroom house or no garage on a block where every comp has one. And document external obsolescence, such as a commercial truck depot that opened next door after your last assessment.

Two things rarely work. Photos of a messy interior (mess is curable) and general gripes about the neighborhood (neighborhood quality is already baked into the sales data).

For real deferred maintenance, get at least two written contractor estimates on letterhead. A verbal quote from a buddy in the trades carries zero evidentiary weight. The board needs paper it can file.

Recent professional home inspection? Fair game. Maryland's appeal process, for example, accepts evidence of physical defects as documentation at the Maryland Tax Court level. ^[7]

Can you use purchase price as evidence, and when does it work?

Yes, and it's often the cleanest evidence you have if the sale was recent. An arm's-length purchase within the last two to three years is strong proof of market value, because it's exactly what a real buyer paid with real money.

The catch is timing. The assessor's appraisal date usually sits before your purchase, so you need the sale close enough in time to matter. Bought in October 2024 with a January 1, 2025 appraisal date? Highly persuasive. Bought in 2019 for a 2025 appraisal date? The market has moved and the argument loses air.

You also need a clean transaction. Sales between relatives, foreclosures, and estate sales that never hit the open market can be set aside. Bring your closing disclosure (or the older HUD-1) to show the terms.

Texas gives this real teeth. Under Tax Code Section 41.43(b), if you bought the property in the two years before January 1 of the tax year at a price below the appraisal district's value, the district must prove by clear and convincing evidence that its number is correct. ^[2] That flips a heavy burden onto the county.

What income and expense data is required for rental property appeals?

For income-producing property, assessors can use three approaches: cost, sales comparison, and income. On a single-family rental or small multifamily, the income approach often drives the assessor's number, so you attack it on its own terms.

Income-approach evidence means actual rent rolls for the past twelve months, a profit-and-loss statement or the Schedule E from your federal return, documented vacancy rates from a local market report, and capitalization rates from published sources like CBRE, CoStar, or a local commercial broker's market report.

If the assessor used a 5% cap rate and market cap rates for your property class run 6.5%, that gap alone can cut value by 20% or more. Cap rate data is public. Many commercial brokerages publish annual market reports by city and property type.

Bigger commercial properties may need a formal income-approach appraisal from a MAI-designated appraiser (Member of the Appraisal Institute). That work runs $1,500 to $5,000 or more. The stakes on a $3 million assessed office building scale up too.

Owners in high-value jurisdictions like LA County and Santa Clara County lean on income-approach arguments even for small multifamily, because assessed values there are so large that a single point of cap rate moves tens of thousands of dollars.

What evidence formats do boards of equalization actually accept?

Most boards take paper submissions, PDF uploads through an online portal, or in-person presentation at the hearing. The format rules vary more than people expect, and blowing a format deadline can bar your evidence entirely.

For paper hearings, bring at least three copies: one for the board, one for the assessor's representative, one for you. Many boards won't make copies at the hearing.

Remote and online hearings, which became common after 2020 and stuck around in a lot of jurisdictions, usually want exhibits uploaded through a case portal before the hearing date. Upload deadlines often fall 48 to 72 hours ahead, not the morning of. Miss it and your evidence may not be admitted.

Format specs matter more than people realize. A 200-page PDF dump of every real estate article you ever bookmarked gets ignored. A clean four-page packet with a cover sheet, a one-page summary, one page of comps in a table, and one page of photos gets read. Hearing officers process dozens of cases a day. Brevity is itself a form of evidence quality.

Most jurisdictions also require you to exchange evidence with the assessor before the hearing rather than spring it on them that day. Georgia requires evidence exchange at least five days before a Board of Equalization hearing under O.C.G.A. Section 48-5-311. ^[8] Check your local rules. The Gwinnett County Tax Assessor posts its appeal procedures and submission requirements online.

What evidence is commonly rejected or ignored?

This is where DIY appeals fall apart. Knowing what not to bring saves your time and keeps you from torpedoing your own credibility.

Zillow and Redfin automated estimates (AVMs) get rejected almost everywhere as hearsay. They're algorithms, not appraisals, and no assessor is bound by them. Zillow's own accuracy data puts the Zestimate's median error around 2.4% nationally, but the error on any single home can top 15%. ^[9] The hearing officer knows this.

Neighbor testimony about what they think your house is worth is not evidence. Affidavits from friends are not evidence. Your gut read on the market is not evidence.

"I heard prices dropped" is not a fact a board can act on. Bring closed sales or bring nothing on that point.

Tax bills from nearby properties are weak on their own. An equalization argument ("my neighbor pays less") requires you to show the neighbor's property is genuinely comparable and that the gap comes from unequal assessment, not a legitimate difference in market value. To make a uniformity claim, you need the neighbor's assessed value, your assessed value, and ideally an assessment ratio for both. Texas has a formal equity appeal process under Tax Code Section 41.43(b), but most states treat this as secondary to the market value argument. ^[2]

Emotional appeals go nowhere on value. How long you've lived there, your fixed income, how much you love the house: none of it changes market value. It might qualify you for a separate exemption or abatement program, but that's a different process from a value appeal.

How do you organize your evidence file for maximum impact?

Build your submission like a short legal brief: conclusion first, then support. Hearing officers decide better when you lead with the number you want.

A winning packet for a residential appeal usually runs four to eight pages.

Page 1: Cover sheet. Property address, parcel number, current assessed value, your requested value, and one sentence stating your theory ("Market sales show this property's market value is $340,000, not $415,000").

Page 2: Comparable sales grid. Address, sale date, sale price, gross living area, price per square foot, and a simple net adjustment column. Put your subject property in the first row.

Pages 3 to 4: Photos. Exterior condition, any defects worth documenting, and a neighborhood shot if it helps (power lines, commercial intrusion, and the like).

Page 5 (if needed): Contractor estimates or inspection excerpts with the dollar figures highlighted.

Page 6 (if needed): Your closing disclosure or HUD-1 if you bought recently.

Number your exhibits and reference them out loud: "Exhibit B, the comps grid, shows an average sale price of $185 per square foot." That keeps the board tracking with you and builds a clean record if you have to appeal further.

Want a template for this? The TaxFightBack DIY appeal kit uses the exact packet format that's carried hundreds of successful residential appeals, with no contingency fee. One flat cost, and you keep every dollar of the reduction.

What are the evidence rules for hearings in specific large counties?

Rules vary enough that a few high-population examples are worth knowing before you file.

Cook County, Illinois: The Board of Review takes evidence through its online portal. Residential filers can submit comps on the board's own comparable form. The board's rules require comps within 25% of subject gross living area, same township preferred, closed within twelve months of the triennial reassessment date. ^[4]

Los Angeles County, California: The Assessment Appeals Board requires evidence filed at least five business days before the hearing. Under California Revenue and Taxation Code Section 1606, the applicant carries the burden of proof on value. ^[10] For the Los Angeles County property tax appeal, the AAB accepts appraisal reports, comparable sales, income and expense data, and repair estimates.

Bexar County, Texas: The Appraisal Review Board follows the Texas Property Tax Code on evidence exchange. Both sides must deliver evidence to each other no later than the first day of the hearing unless both agree otherwise. ^[2] The Bexar County Tax Assessor website spells out local procedural rules.

Hennepin County, Minnesota: The Minnesota Tax Court Small Claims Division handles residential appeals and runs notably informal. Property owners can submit their own comp grids without a lawyer. Evidence must be filed ten days before the hearing. ^[11]

County	Comp window	Evidence exchange deadline	Appraisal required?
Cook County, IL	12 months	At submission	No
Los Angeles, CA	12-24 months	5 business days before	No
Bexar County, TX	12 months	Day of hearing	No
Hennepin County, MN	12 months	10 days before	No
Montgomery County, MD	24 months	At filing	No

What happens if you don't have perfect evidence?

Nobody walks into a hearing with a perfect file. The real question is whether your evidence beats the assessor's file, not whether it's flawless.

Imperfect comps still work. If your best comps sit 1.2 miles away instead of one mile, bring them with a note saying nothing closer sold in the period. Boards don't toss a comp grid on a technicality when the taxpayer clearly made a good-faith effort.

Only found two comps instead of five? Present two and explain the thin market. One clean, well-documented sale beats five messy ones.

Got a defect but couldn't line up a contractor estimate in time? Show the photos and ask for more time. Most boards grant a short continuance for a legitimate reason.

The most common mistake isn't thin evidence. It's no evidence at all. Roughly 30 to 40% of residential appeals produce some reduction, per multi-state outcome data in the Lincoln Institute of Land Policy's Significant Features of the Property Tax database. ^[12] Plenty of those wins come from modest files. Show up organized and fact-based and you've got a real shot.

In St. Louis County personal property tax appeals, the process runs more informal and the county often negotiates before the formal hearing, which means even preliminary evidence submitted early can produce a result.

What should you say at the hearing to present your evidence effectively?

Most residential oral presentations last three to five minutes. You're not arguing to a jury. You're walking a busy hearing officer through a paper record.

Open with your conclusion: "The evidence I'm submitting today shows this property's market value is $340,000, not $415,000 as assessed."

Then walk each exhibit in order. Don't read every number out loud. Point to the grid, name the exhibit, give the takeaway: "Exhibit B shows five closed sales in the neighborhood between January and June 2024. The average adjusted sale price is $185 per square foot. The assessor's value implies $215."

Got a defect? Show the photo and the estimate: "Exhibit C is a photo of the foundation crack. Exhibit D is a licensed contractor's written estimate for $28,000 in repairs."

Close by restating your requested value and the basis for it. Don't beg. Don't apologize. You're presenting facts.

When the hearing officer asks a question, answer straight. If you don't know, say so. "I don't know the exact cap rate the district used" is a fine answer. Guessing wrong damages your credibility on the rest of your file.

After the hearing, follow up in writing if the board doesn't rule on the spot. Many boards take four to eight weeks to mail a determination. Keep copies of everything.

Frequently asked questions

Can I use a Zillow estimate as evidence in a property tax appeal?

No. Automated valuation models like Zillow's Zestimate are rejected by virtually every board of equalization and appraisal review board because they aren't appraisals and aren't prepared by a credentialed professional. Zillow's own published accuracy data shows a median error around 2.4% nationally, but individual property errors can top 15%. Closed MLS sales or a licensed appraisal are what boards actually act on.

How many comparable sales do I need to win an appeal?

Three to five is the practical standard. Fewer than three is thin but not disqualifying if you explain a limited sales market. More than seven starts to bury your argument unless each one clearly supports your position. Quality beats quantity. One tight, recent, well-documented sale in the same subdivision outperforms five loose comps from across town.

Do I need a licensed appraiser to appeal my property taxes?

No, not for most residential appeals. Comparable sales you research yourself, photos, repair estimates, and your purchase price are all valid evidence you can assemble without hiring an appraiser. A licensed appraisal helps when the value gap is large, when your property has unusual features, or when you expect to appeal to tax court after losing at the board level.

What is the burden of proof in a property tax appeal?

In most states, the assessor's value carries a legal presumption of correctness and the taxpayer bears the burden of proof. Illinois codifies this in 35 ILCS 200/16-185 and Texas does so in Property Tax Code Section 41.43. A few states split the burden or shift it to the assessor in certain cases, such as Texas when you paid less than the assessed value in an arm's-length purchase within two years.

Can I use my purchase price as evidence of market value?

Yes, if the sale was arm's-length and recent. A closing within two to three years before the appraisal date is strong evidence because it reflects what a real buyer paid under market conditions. Bring your closing disclosure or HUD-1 settlement statement. Sales between relatives, foreclosure sales, and estate sales that weren't marketed publicly may be discounted or disregarded by the assessor.

Do photos of property damage actually help at a hearing?

Photos alone are weak. Photos paired with a licensed contractor's written repair estimate on letterhead are much stronger, because they turn a condition problem into a dollar figure the hearing officer can justify in writing. Document foundation issues, failing HVAC, wet basements, roof problems, and structural defects. Photos of clutter or cosmetic issues rarely influence a hearing officer.

How do I find comparable sales data for free?

Your county assessor's website often has a property search tool that shows recent sales by neighborhood or street. Realtor.com, Redfin, and Homes.com also show closed sale prices. A licensed real estate agent can run a formal MLS comp search for you, often free as a courtesy. Some counties, like Cook County in Illinois, publish downloadable sales files right on the assessor portal.

What evidence works for an income-producing rental property appeal?

For rentals, use actual rent rolls from the past twelve months, a profit-and-loss statement or Schedule E from your federal return, documented vacancy rates from a local market report, and capitalization rate data from published brokerage sources like CBRE or CoStar. If the assessor's assumed cap rate sits below market rates, that alone can justify a significant reduction under the income approach.

When is the deadline to submit evidence before a hearing?

It depends on the jurisdiction. Georgia requires evidence exchange at least five days before the hearing under O.C.G.A. Section 48-5-311. Los Angeles County's Assessment Appeals Board requires filing at least five business days before. Hennepin County's Minnesota Tax Court requires ten days. Texas appraisal review boards require exchange by the first day of the hearing. Always check your county's rules; missing the deadline can bar your evidence entirely.

Can I appeal just because my neighbor pays less in property taxes?

You can raise a uniformity or equalization argument, but it takes more than pointing at a lower tax bill. You need to show both properties are genuinely comparable and that the assessment ratio differs unfairly, more than that the tax bills differ. Texas has a formal equity appeal process under Tax Code Section 41.43(b). Most states treat market value arguments as stronger and easier to win than equalization claims.

What format should I submit my evidence in at a hearing?

Bring at least three paper copies to in-person hearings: one for the board, one for the assessor's representative, one for you. For remote or online hearings, upload a PDF through the county's case portal before the submission deadline, usually 48 to 72 hours before the hearing. Keep your packet to four to eight pages. A clear, brief submission gets read; a 100-page dump does not.

What is a board of equalization and who sits on it?

A board of equalization (sometimes called a board of review or appraisal review board) is the first formal appeal body in most states. Members vary: some are elected officials, some are appointed citizens, some are county employees. They're generally not licensed appraisers. They weigh evidence, hear arguments from the taxpayer and the assessor's representative, and issue a written determination of value.

Can I bring a real estate agent to testify on my behalf?

Some jurisdictions allow it, some don't. An agent can't testify as an expert witness on value the way a licensed appraiser can, but they can sometimes present a competitive market analysis (CMA) as supporting documentation. Check your county's specific rules. A written CMA attached to your submission as an exhibit is often more useful than having the agent appear in person.

What happens if I lose at the board of equalization level?

You can typically appeal to a state tax court, circuit court, or a dedicated tax tribunal, depending on your state. At that level the rules of evidence get more formal and an independent appraisal is usually necessary. Filing deadlines for the next level often run 30 to 90 days from the board's written decision. Miss that window and you forfeit further appeal for that tax year.

Sources

1. Illinois General Assembly, 35 ILCS 200/16-185, Property Tax Code: Illinois statute provides the board of review's determination is prima facie correct and the burden is on the taxpayer to prove otherwise
2. Texas Legislature, Texas Property Tax Code Section 41.43: Texas Property Tax Code Section 41.43 states the appraisal district's value is presumed correct; also establishes equity appeal standard and the two-year purchase price burden shift
3. Appraisal Institute, The Appraisal of Real Estate, 15th Edition: Only closed arm's-length sales, not listings or pending sales, are used as comparable sales evidence in appraisal practice
4. Cook County Board of Review, Rules and Procedures for Residential Appeals: Cook County Board of Review requires comps within 25% of subject gross living area, same township preferred, closed within twelve months of the reassessment date
5. National Association of Realtors, Cost of Residential Appraisal Survey: Independent residential appraisals typically cost $400 to $700 for a single-family home
6. Appraisal Foundation, Uniform Standards of Professional Appraisal Practice (USPAP): Appraisals prepared under USPAP by credentialed professionals are legally defensible and accepted by hearing officers and courts
7. Maryland State Department of Assessments and Taxation, Property Tax Appeal Procedures: Maryland Tax Court level appeals accept evidence of physical defects as acceptable documentation for residential property appeals
8. Georgia General Assembly, O.C.G.A. Section 48-5-311, Board of Equalization Procedures: Georgia requires evidence exchange at least five days before the Board of Equalization hearing
9. Zillow Research, Zestimate Accuracy Data: Zillow's Zestimate has a median absolute percentage error of approximately 2.4% nationally, with individual property errors potentially exceeding 15%
10. California State Board of Equalization, Revenue and Taxation Code Section 1606: Under California Revenue and Taxation Code Section 1606, the applicant has the burden of proof on value at an assessment appeals hearing
11. Minnesota Judicial Branch, Minnesota Tax Court Small Claims Division: Minnesota Tax Court Small Claims Division handles residential appeals informally, allows owners to submit their own comp grids, and requires evidence filed ten days before the hearing
12. Lincoln Institute of Land Policy, Significant Features of the Property Tax database: Roughly 30 to 40 percent of residential appeals result in some reduction based on multi-state appeal outcome data