Formal written protest vs. informal review: which one should you file?

Last updated 2026-07-10

What is an informal review of a property tax assessment?

An informal review is exactly what it sounds like: you call or walk into your county assessor's office, explain why you think your assessed value is wrong, and a staff member looks at your property record. No forms. No sworn statements. No hearing officer. The assessor can fix obvious errors on the spot, like a data entry mistake that shows your house has four bathrooms when it has two.

That's the best-case outcome for an informal review, and it does happen. Assessors make clerical errors regularly. A 2017 Lincoln Institute of Land Policy study found that across major U.S. jurisdictions, data errors in property records contributed to assessment-ratio disparities that often exceed 10 percent for residential properties ^[1].

The downside is real. The informal review is discretionary. The assessor's office can say no, and you have no recourse from that no. You haven't filed anything legally, so you have no pending case. In most states, the informal review does not pause your formal appeal deadline. Miss the formal deadline while waiting for an informal answer, and you've lost your appeal rights for the year entirely.

Some counties push the informal review hard because it clears their dockets. That's a reason for them, not for you.

What is a formal written protest (and what makes it 'formal')?

A formal written protest is a legal document you file with your county's appraisal review board, board of equalization, or similar tribunal. The exact name varies by state. Texas calls it a Notice of Protest filed with the Appraisal Review Board ^[2]. Illinois property owners file with the Board of Review ^[3]. California uses an Application for Changed Assessment filed with the Assessment Appeals Board ^[4].

What makes it formal: it's filed in writing, assigned a case number, and puts the assessor's value under legal scrutiny. You get a hearing. The assessor has to defend the number. You present evidence. The board issues a written decision. If you don't like that decision, you can appeal further to state tax court or district court, depending on jurisdiction.

The formal protest also has teeth before the hearing ever happens. Once a case number exists, assessors and their attorneys know a hearing is coming. That creates real pressure to settle. Many cases close through settlement talks after a formal protest is filed, not before it.

One more thing that matters: filing a formal protest typically preserves your right to a refund if the board reduces your value. In Texas, the assessor must send a corrected bill and refund any overpayment within 60 days of a final order ^[2]. No formal protest, no refund right.

How do the deadlines compare between informal and formal routes?

Deadlines for the informal review are either nonexistent (you can often request one anytime before the formal deadline) or they match the formal deadline. Deadlines for formal protests are hard legal cutoffs.

State	Formal protest deadline	Deadline trigger	Source
Texas	May 15 or 30 days from notice, whichever is later	Notice of Appraised Value mailed	Texas Tax Code §41.44 [2]
California	60 days from mailing of notice, or Sept 15 to Nov 30 for regular roll	Assessment notice or roll completion	Cal. Revenue & Taxation Code §1603 [4]
Illinois (Cook County)	varies by township, typically Feb-Apr for triennial reassessment	Assessor's notice	Cook County Assessor [3]
New York (NYC)	March 1 (Tax Commission), then Apr 1-Oct 31 for Small Claims	Tentative assessment roll	NYC Finance [5]
Georgia	45 days from notice	Board of Assessors notice	O.C.G.A. §48-5-311 [6]
Florida	25 days from TRIM notice mailing (usually Sept)	TRIM notice	Fla. Stat. §194.011 [7]

The pattern is clear. Formal deadlines run from 25 days (Florida) to several months (California's regular roll window). Miss one by a single day and your appeal is dead in almost every jurisdiction. Informal reviews carry no such penalty, but they also carry no benefit when the assessor says no.

Here's the safe play if you're unsure: file the formal protest before the deadline, then chase the informal conversation in parallel. You can always withdraw the formal protest if the informal review gives you everything you want.

Which one actually gets you a bigger assessment reduction?

The formal process wins, and it's not close, whenever the overassessment is more than a rounding error.

Nobody has clean national data comparing reduction amounts by route, because assessors don't publish informal review outcomes as public record. But the indirect evidence is strong. The International Association of Assessing Officers standard for assessment uniformity requires assessment-to-sale ratios to stay within a coefficient of dispersion (COD) of 10 to 15 percent for residential properties ^[8]. When assessors settle formal protests, they're defending against exactly that standard. They settle cases they'd lose at a hearing.

The informal review has no such pressure. The person you're talking to has no authority to settle a contested valuation the way a hearing officer can. They can fix errors. They can't typically make the judgment call that your neighborhood's market trend was misapplied and cut your value by 12 percent.

For a reduction larger than a few thousand dollars, you almost always need the formal route. The effort is higher. You gather comparable sales, fill out forms, and show up (or submit written evidence). The payoff scales with the work. A homeowner with a $400,000 overassessment who wins a 10 percent reduction saves roughly $1,000 to $1,500 a year depending on the local rate, and that saving repeats every year until the next reassessment cycle.

What evidence do you need for each type of review?

For an informal review, you need almost nothing. Bring your assessment notice and any obvious proof of errors: a floor plan showing the square footage the assessor used is wrong, a permit showing your roof is 15 years old and not 2, photos of condition problems. The staff member can pull your property card and compare right there.

For a formal written protest, you need a real evidence package. The heart of it is comparable sales, properties like yours that sold recently for less than your assessed value implies. Most state hearing boards want evidence submitted ahead of the hearing, sometimes 10 to 14 days out. Texas Appraisal Review Boards require evidence exchange at least 14 days before the hearing under Texas Tax Code §41.67 ^[2].

Your evidence package for a formal protest should include:

A list of three to six comparable sales, pulled from public deed records or your county's sales database, with sale prices, sale dates, addresses, and key physical characteristics. A reconciliation showing why your property's value per square foot should track those sales rather than the assessor's number. Any independent appraisal you've obtained (not required, but powerful). Documentation of condition problems: deferred maintenance, foundation issues, environmental concerns. Income data if you have a rental property.

The TaxFightBack DIY appeal kit includes a step-by-step comparable sales worksheet and pre-formatted evidence submission templates built for the formal protest process, so you're not starting from a blank page.

One thing people miss: the assessor's own data is evidence. Request your property record card (it's public record in all 50 states) before you file. Errors on it are your fastest wins.

Does an informal review pause the formal protest deadline?

Almost never. This is the most dangerous misconception in property tax appeals.

In most states, the formal protest deadline runs from the date of your assessment notice regardless of any ongoing informal discussions. Texas Tax Code §41.44 is explicit that the deadline is the later of May 15 or 30 days from the notice date, full stop ^[2]. California's deadline runs from the date of notice regardless of any contact with the assessor's office ^[4]. Florida's 25-day window from the TRIM notice does not pause for informal review requests ^[7].

There are narrow exceptions. Some jurisdictions toll the deadline if you file a timely records request for your property data and the assessor fails to provide it. A few counties run formal pre-hearing conference programs that extend deadlines as part of the program. Check your specific county's rules.

The safe move is always to file the formal protest on time. You lose nothing by doing it. You keep all your rights. Then if the informal review gives you a result you like, you withdraw the formal filing. If it doesn't, you're already in the queue.

What happens at a formal protest hearing?

The hearing is less intimidating than it sounds. Most residential hearings before appraisal review boards or boards of equalization last 15 to 45 minutes. You're not in a courtroom. You're usually in a conference room or a government meeting room, sometimes appearing by video in states that adopted remote hearings after 2020.

The typical sequence: you present your evidence first (you're the petitioner), the assessor's representative presents theirs, you get a chance to rebut, and the board deliberates. Some boards rule on the spot. Others mail a written decision within 30 to 90 days.

The board members are not judges. In many states they're appointed citizens trained in property valuation principles, not licensed appraisers. They respond well to organized, factual presentations and tend to distrust aggressive posturing.

Bring three copies of your evidence packet: one for you, one for the board, one for the assessor's representative. Arrive early. Know your three key comparables cold. Be ready to explain why those sales are relevant to your property. The assessor will likely argue their comparables are better, and you need to explain the differences.

For major metro jurisdictions with high appeal volumes, like Cook County or Los Angeles County, the boards handle hundreds of cases and appreciate brevity.

Can you do both an informal review and a formal protest at the same time?

Yes, and you should.

Filing a formal protest doesn't stop you from talking to the assessor's office informally. Many assessors will call you to discuss a settlement after they receive your formal protest, because a settled case costs them less than a hearing. That call is an informal review happening after the formal filing.

The sequence that works: request your property record card as soon as your notice arrives, call the assessor's office to flag any obvious errors, file the formal protest before the deadline no matter what that conversation produces, then keep talking to the assessor's office as your hearing date approaches.

Some jurisdictions require a pre-hearing settlement conference. Illinois Cook County Board of Review runs a settlement program where assessors review formal appeals and may issue a recommendation before the hearing ^[3]. Accept the recommendation and the case closes. Reject it and your hearing stays scheduled. You keep options at every step.

This dual-track approach means you never trade legal rights for a friendly conversation.

What are the risks of relying only on the informal review?

Three real risks.

First, you can miss the formal deadline. This happens to homeowners every year. They call the office, have a pleasant conversation, feel like things are moving, and then realize the 30-day or 45-day window closed while they waited. No formal filing means no appeal rights for that tax year.

Second, informal outcomes don't always survive. In some states, a value reduction granted informally through an office review can be reversed or ignored when the assessment roll is finalized, because no formal order requires the change. A formal board decision is binding.

Third, you have no escalation path. If the informal review produces a reduction you think is still too small, you have nowhere to go unless you filed a formal protest. The formal protest gives you the right to appeal further to state tax court. In Texas, the next step is district court or binding arbitration. In California, it's the superior court. In Georgia, you can go to superior court under O.C.G.A. §48-5-311 ^[6]. None of those paths exist if you only did an informal review.

For homeowners in high-value markets like Montgomery County, Maryland or Santa Clara County, where one percentage point of assessed value can mean thousands of dollars, losing escalation rights is an expensive mistake.

How do you file a formal written protest step by step?

Step one: get the right form. Every jurisdiction has a specific one. In Texas it's Form 50-132, Notice of Protest, available from your county appraisal district ^[2]. In California it's the Application for Changed Assessment from your county's Assessment Appeals Board ^[4]. In Georgia, it's a letter or form filed with the Board of Assessors ^[6]. Search your county's assessor or board of equalization website for the current year's form.

Step two: fill in the basics. Your name, property address, parcel identification number (on your assessment notice), and the value you believe is correct. Many forms ask you to state the grounds: market value error, unequal appraisal, exemption denial, or procedural error. Check all that apply.

Step three: file before the deadline. Methods vary. Texas appraisal districts accept in-person delivery, certified mail (postmark controls), fax, and in many districts, e-filing through their online portal ^[2]. Keep a copy of everything. If you mail, use certified mail with return receipt. If you fax, keep the fax confirmation.

Step four: request the hearing evidence exchange materials from the assessor. In Texas, you can request the assessor's evidence at least 14 days before the hearing under §41.67 ^[2]. In California, both parties exchange evidence 10 days before the hearing under Rule 308 of the State Board of Equalization's hearing rules ^[4].

Step five: build your evidence package. Comparable sales, property record card, condition documentation. A well-organized three-ring binder or PDF set does the job.

For Bexar County, Gwinnett County, and Bibb County owners, check the county appraisal district or board of assessors website directly, since local procedures for form submission and evidence exchange differ from state defaults.

What if the formal protest decision still leaves your value too high?

You can escalate. Every state with a formal protest process has a next step, though the path and cost vary.

In Texas, you can file for binding arbitration (for properties valued under $5 million for homesteads, under $1 million for other residential) or sue in district court ^[2]. Arbitration costs a deposit of $500 to $1,500 depending on property value, refundable if you win.

In California, if the Assessment Appeals Board rules against you, you can file a claim for refund and then sue in superior court. The filing fee for a superior court property tax case runs roughly $400 to $500.

In New York City, property owners can go from the Tax Commission to the New York State Supreme Court. For commercial properties, this route is common and well-worn ^[5].

In Florida, after the Value Adjustment Board rules, you can file suit in circuit court within 60 days under Fla. Stat. §194.171 ^[7].

None of these escalation paths exist if you only pursued the informal route. That's the clearest reason to always file the formal protest: you keep every door open. You can always settle or withdraw. You can never un-miss a deadline.

The TaxFightBack appeal kit walks through the evidence-building process for the formal protest stage specifically, because that's where you have real bargaining power.

Are informal reviews ever the right choice?

Honestly, yes, in two specific situations.

First, if your overassessment is small, say $10,000 to $20,000 in assessed value in a low-tax-rate county, the tax savings from a formal hearing might be $200 to $400 a year. If the formal process takes multiple hours of evidence prep plus a hearing appearance, the informal review is a reasonable first stop. Fix it with a quick call if you can. If not, file formally.

Second, if you have a clear, provable error on your property record card, like wrong square footage, wrong number of bedrooms, or a permit showing a structure was demolished. Assessors fix those quickly and informally, and you won't need a hearing to prove two plus two equals four.

Everything else, a disputed market value, a uniformity argument that neighbors are assessed lower, a fight over depreciation on an older home, needs the formal process. The informal review has no mechanism to resolve those disputes because it has no evidentiary standard and no binding outcome.

For Hennepin County or NYC property owners facing complex commercial valuations, skip the informal step and go straight to formal. The stakes are too high and the assessors too experienced for an informal chat to move the number.

Frequently asked questions

Does filing an informal review stop the formal protest deadline from running?

No, in almost every state it does not. The formal deadline runs from the date of your assessment notice regardless of any informal discussions. Texas gives you May 15 or 30 days from notice. Florida gives you 25 days from the TRIM notice. California's window is 60 days from notice or a set annual period. File the formal protest before the deadline and pursue informal discussions at the same time.

Can the assessor raise my value after I file a formal protest?

In most states, yes, this is a real risk in certain scenarios. Texas appraisal review boards can raise a value if the assessor files a counter-notice within the same case. California allows the assessor to file a counterclaim. This risk is rare for standard residential overvaluation cases, but it's a reason to gather strong evidence before you file rather than filing on a hunch with no comps to back you up.

How long does a formal protest hearing actually take?

For residential properties, most hearings run 15 to 45 minutes. Commercial cases can take longer. Many states have moved to remote video hearings. You present your evidence, the assessor presents theirs, you rebut, and the board deliberates. Some boards rule on the spot; others mail a decision within 30 to 90 days. Prep time, building your comp set and evidence packet, typically takes 3 to 8 hours for a motivated homeowner.

Is there a filing fee for a formal written protest?

Usually no, for the initial protest before the appraisal review board or board of equalization. Texas, California, Georgia, and most other states charge nothing to file the initial formal protest. Fees appear at the escalation stage: Texas arbitration deposits run $500 to $1,500; California superior court filings run roughly $400 to $500. Check your specific county, but the first-level formal hearing is almost always free to file.

What is the difference between a board of equalization and an appraisal review board?

They do the same job under different names. Texas, Kansas, and a few others use 'Appraisal Review Board.' California, Colorado, Washington, and many others use 'Board of Equalization' or 'Assessment Appeals Board.' Both are quasi-judicial bodies that hear formal protests, review evidence from both the property owner and the assessor, and issue binding decisions. The name on the form you file tells you which body your state uses.

What if I can't attend my formal protest hearing in person?

Most states let you submit a written affidavit or evidence packet instead of appearing, and many now offer video hearings. Texas explicitly allows homeowners to submit evidence by affidavit under Texas Tax Code §41.45. If you can't appear and your jurisdiction doesn't offer video, submit a written statement with your evidence well before the deadline. Call the board to confirm their process. Missing without notice usually results in a dismissal or a default ruling for the assessor.

How do I find comparable sales to support my formal protest?

Start with your county assessor's own sales database, which most counties publish online as public record. Look for sales of properties like yours (similar size, age, condition, neighborhood) that closed within the 12 months before your assessment date. Your county recorder's deed records are another source. Real estate portals like Zillow and Redfin show sale prices but may lag on data. Aim for three to six comparables that sold for less per square foot than your assessed value implies.

Can I withdraw a formal protest after I file it?

Yes, in virtually every jurisdiction. If the informal discussion with the assessor after you file produces a satisfactory reduction, or you decide the evidence doesn't support your case, you can withdraw the formal protest before the hearing. Contact the board or appraisal district in writing and request a withdrawal. Keep a copy. Withdrawing closes the case for that year; you cannot refile for the same tax year after withdrawing.

What is unequal appraisal and how does it relate to a formal protest?

Unequal appraisal means your property is assessed at a higher ratio of market value than comparable properties in your area, even if your absolute value might be defensible on its own. Texas Tax Code §41.43 explicitly allows formal protests on unequal appraisal grounds, separate from market value arguments ^[2]. Several other states have similar provisions. It requires showing that neighbors with similar properties carry lower assessed values, which you can often demonstrate using the assessor's own public data without a paid appraisal.

Does hiring a property tax attorney or consultant instead of doing it yourself change whether I use the formal or informal route?

No. Attorneys and consultants also use the formal protest process, because that's the only route with legal weight and escalation rights. What changes is who prepares the evidence and who appears at the hearing. Contingency-fee firms typically take 25 to 40 percent of your first year's tax savings as their fee. Filing a formal protest yourself costs nothing beyond your time and keeps 100 percent of any reduction. The formal process is built to be handled by non-attorneys.

If I got a reduction through an informal review last year, can I still file a formal protest this year?

Yes. Each tax year is a separate proceeding. A reduction granted informally in a prior year does not carry forward automatically and does not prevent you from filing a formal protest in the current year. If last year's informal reduction was smaller than you wanted, this year you should file formally to lock in your rights, especially if the assessor's office has raised the value again.

What happens if the formal protest board reduces my value but the assessor disagrees with the decision?

The assessor can also appeal a board decision in most states. In Texas, the appraisal district can file suit in district court against a board ruling it considers wrong. This is uncommon for residential cases but happens with large commercial properties. The board's written decision is the operative number for your tax bill in the interim, and you'd pay based on that reduced value while any further litigation proceeds.

Sources

1. Lincoln Institute of Land Policy, 'Improving the Performance of Property Tax Assessment' (2017): Data errors in property records contributed to assessment-ratio disparities often exceeding 10 percent for residential properties across major U.S. jurisdictions.
2. Texas Comptroller of Public Accounts, Texas Property Tax Code (Title 1, Chapters 41-42): Texas formal protest deadline is May 15 or 30 days from notice (§41.44); evidence exchange 14 days before hearing (§41.67); refund required within 60 days of final order; arbitration and district court escalation paths; unequal appraisal protest grounds (§41.43).
3. Cook County Assessor's Office, Appeals Overview: Illinois Cook County Board of Review handles formal appeals with a settlement program that may produce recommendations before the hearing.
4. California State Board of Equalization, Assessment Appeals: California formal protest deadline is 60 days from notice or September 15 to November 30 for regular roll (Cal. Revenue & Taxation Code §1603); evidence exchange 10 days before hearing under BOE hearing rules.
5. New York City Department of Finance, Property Tax Appeals: NYC property owners file with the Tax Commission by March 1 and can escalate from the Tax Commission to the New York State Supreme Court.
6. Georgia General Assembly, O.C.G.A. §48-5-311 (Property Tax Appeals): Georgia formal protest deadline is 45 days from the Board of Assessors notice; escalation path is superior court.
7. Florida Department of Revenue, Property Tax Oversight, Fla. Stat. §§194.011 and 194.171: Florida formal protest deadline is 25 days from TRIM notice mailing; escalation to circuit court must occur within 60 days of Value Adjustment Board decision.
8. International Association of Assessing Officers (IAAO), Standard on Ratio Studies (2013, updated 2023): IAAO standard for assessment uniformity requires coefficient of dispersion (COD) of 10 to 15 percent or less for residential properties.
9. Texas Comptroller of Public Accounts, Texas Property Tax Code §41.45 (Hearing Procedures): Texas homeowners may submit evidence by affidavit in lieu of in-person appearance at appraisal review board hearings.
10. Texas Comptroller of Public Accounts, Texas Property Tax Code §41.43 (Unequal Appraisal): Texas Tax Code §41.43 allows formal protests on unequal appraisal grounds, separate from market value arguments.