Last updated 2026-07-09
TL;DR
In most counties you can call or visit the assessor's office and request an informal review before you file a formal appeal. Bring comparable sales, your property record card, and any proof of errors. Many assessors fix obvious mistakes on the spot. This costs nothing and does not waive your right to appeal if the talk goes nowhere.
What is an informal review with the assessor, and is it different from an appeal?
An informal review is a conversation, not a legal proceeding. You contact the assessor's office, explain why you think your assessment is wrong, and they look at it. No hearing officer, no sworn testimony, no docket number. If the assessor agrees there's an error, they can correct it administratively and you never file an appeal form.
A formal appeal goes to an independent body: a county board of equalization, an assessment appeals board, a tax court, or something equivalent. That body has legal authority to order a reduction the assessor doesn't want to give. Formal appeals have hard deadlines, filing fees in some places, and procedural rules that can get you dismissed if you miss a step.
The informal review sits in front of all of that. Think of a billing dispute you handle with the company directly before you escalate to your credit card issuer. Most of the time the company fixes the obvious error once you flag it. Property assessment works the same way.
Here's the part that trips people up. Requesting an informal review does not pause your formal appeal clock in most states [1]. The deadline keeps running while you talk. If you get close to the deadline with no resolution, file the formal appeal anyway to protect yourself. You can always withdraw it later if the assessor comes around.
Do most counties actually allow direct negotiation with the assessor?
Yes. The overwhelming majority do, though they rarely advertise it loudly. The International Association of Assessing Officers (IAAO) recommends informal review as a best practice, and most state statutes explicitly let assessors correct errors before the formal protest period closes [2].
The Cook County Assessor in Illinois runs a formal "Certificate of Error" program that lets homeowners get corrections without a formal appeal when the assessor's office agrees a mistake was made [3]. California county assessors are required by Revenue and Taxation Code Section 1605 to give property owners a chance to present evidence before values are finalized [4]. In Texas, Section 41.413 of the Tax Code lets appraisal districts correct errors informally at any time before a hearing [5].
The specifics vary a lot by state. In some places the informal review is a structured appointment with a staff appraiser. In others it's a phone call. A handful of counties built online portals where you upload evidence and get a written response within 30 days. Check your notice of assessment. Many print the phone number for the "taxpayer assistance" or "informal review" line right on the front page.
Large counties tend to run a more formalized process. Cook County tax assessor tax bill is a good example of a big jurisdiction with a documented informal correction path. Smaller counties often handle the whole thing with one phone call to the chief appraiser.
What actually happens during an informal review meeting?
You sit down with a staff appraiser, not an elected official, in person or on a phone or video call. They pull up your property record card on their screen. You walk through your concerns. The appraiser sees the same data you do, plus the internal notes from when your property was assessed.
Common outcomes:
| Outcome | How common | What happens next |
|---|---|---|
| Assessor agrees, corrects error | Fairly common for data errors | You get a revised notice; no formal appeal needed |
| Assessor offers partial reduction | Occasional | You accept or file formal appeal for more |
| Assessor holds firm | Most common when comps are disputed | File formal appeal before deadline |
| Assessor requests more evidence | Common | Provide it; schedule follow-up |
Data errors get fixed fast because the appraiser can verify them on the spot: wrong square footage, wrong number of bathrooms, a pool that doesn't exist. Value disputes based on comparable sales take longer because the appraiser has to run their own analysis.
Bring your evidence organized. A one-page summary on top helps. The appraiser is probably seeing a dozen people that day and responds better to someone clear and calm than someone arguing about fairness in the abstract. Stick to facts. The county says your house is 2,400 square feet but the building permit says 1,950. The three homes on your street with the same floor plan sold for $280,000 to $295,000, not $340,000.
What evidence should you bring to the assessor's office?
The assessor is not going to lower your value because the number feels too high to you. You need facts they can point to internally as the justification for a correction.
The most effective evidence, ranked by impact:
1. Your property record card with errors circled. Get it free from the assessor's website or office. If it says 4 bedrooms and you have 3, that's a clean win.
2. Recent sales of comparable properties. "Comparable" means similar size, age, condition, and location, sold within the last 12 months, within a mile if possible. Pull three to six comps. The MLS, Zillow's sold listings, and county deed records all work. If comparable homes sold for 10 to 15 percent less than your assessed value, that gap is your argument.
3. A recent appraisal done for another purpose, like a refinance or estate settlement. If a licensed appraiser put your home at $310,000 six months ago and the assessor says $375,000, that's hard to ignore.
4. Photos of condition problems. Roof damage, foundation cracks, flooding history, heavy deferred maintenance. The assessor probably graded your home as average condition. If it's genuinely below average for its age, photos and repair estimates support a downward adjustment.
5. Proof of purchase price if you bought recently at arm's length. Many states treat a recent arm's-length sale price as strong evidence of market value [4].
Skip the general complaints about rising taxes or inflation. That's a policy gripe, not evidence of a wrong assessment, and the appraiser can't do anything with it.
How do you actually request an informal review before the appeal deadline?
Start by finding the right contact. Your assessment notice is the place to look. The letter you got when the new value was set usually lists a phone number or URL just for questions or disputes. If it doesn't, search your county assessor's website for "informal review," "taxpayer assistance," "value conference," or "property owner protest."
When you call, say this: "I received my assessment notice for [address], and I'd like to schedule an informal review before the appeal deadline. Can you tell me the process and whether I need an appointment?"
Request the meeting in writing even if the first contact is by phone. Send a follow-up email confirming the date, time, and what you plan to discuss. That creates a record, which matters if anyone later disputes whether you tried to resolve things informally.
Timing decides a lot. The appeal deadline in most states runs 30 to 90 days from the date on the assessment notice [1]. Assessor's offices jam up near the end of that window. Request your informal review within the first two weeks of getting your notice. Wait until week eight of a 90-day window and you may not land an appointment before the clock runs out.
Some counties fold the informal step into the formal process. In Gwinnett County tax assessor (Georgia), the informal appeal is the first official step in the protest process, not a separate informal path. Georgia requires a 45-day window for the initial written appeal, after which a more formal hearing gets scheduled if the assessor doesn't agree [6]. Know whether your county treats informal review as a distinct pre-step or as part of the formal track.
Does requesting an informal review extend your appeal deadline?
Almost never. Don't assume it does.
A few jurisdictions explicitly pause the formal appeal clock once an informal review is requested. Most do not. Some states say the opposite: the formal deadline is hard, and the assessor has no authority to extend it no matter what informal conversations are happening.
The safe rule is short. If your appeal deadline is close and you have no written commitment from the assessor to reduce your value, file the formal appeal. You can run both processes at once. The assessor can still settle informally after you've filed. A formal appeal just gives you a fallback.
Filing as protection does not make you adversarial. Assessors know homeowners do this. If the informal review resolves in your favor, you withdraw the formal appeal. The filing fee, where one exists, runs about $15 to $50 in states that charge one, and that's cheap insurance.
Unsure of your exact deadline? The assessor's website, your assessment notice, or your state's department of revenue will list the statute-set window. Several state associations of county assessors keep deadline tables online, and they're worth bookmarking.
What can the assessor actually change without a formal appeal?
More than most people realize, but with real limits.
Assessors can correct factual errors at any time in most states. Wrong square footage, wrong year built, wrong lot size, or a structure that doesn't exist all get fixed without any formal proceeding. Depending on the jurisdiction these are called clerical errors or material errors.
Value-based adjustments are murkier. Some assessors will voluntarily cut assessed value when comparable sales clearly support a lower number, especially on low-dollar residential properties where a formal appeal would cost the county more staff time than the adjustment is worth. Others have internal policies against any reduction outside the formal process.
The Cook County Certificate of Error program allows corrections to current and prior year assessments when the error is documented [3]. California's Section 4831.5 allows corrections of base-year value errors going back up to 8 years in some circumstances [4]. Texas appraisal districts can correct appraisal rolls for the current year under Tax Code Section 25.25 [5].
What the assessor cannot do informally: drop your assessment below what the evidence supports just because you asked nicely, apply a blanket percentage cut with no basis, or waive penalties that are governed by separate statute. If you want something beyond a correction, the formal appeal process is built for that.
How often do informal reviews actually result in a lower assessment?
Nobody has clean national data on this. The informal nature of the process means most outcomes never land in a searchable database. What we have are county-level reports and academic studies of formal appeal outcomes, which probably understate informal success rates because the easy cases get resolved before they reach a formal hearing.
The closest reliable data point comes from the Lincoln Institute of Land Policy, which has documented that property owners who file formal appeals get reductions roughly 40 to 60 percent of the time in well-studied jurisdictions, with higher success when the owner brings professional evidence [7]. Informal reviews that focus on factual errors almost certainly beat that rate, since you're not arguing a valuation opinion, you're correcting a verifiable mistake.
In Bexar County tax assessor in San Antonio, the appraisal district's annual reports show a large share of protests resolved informally or by agreement before a formal ARB (Appraisal Review Board) hearing. Texas appraisal districts collectively resolved over 700,000 property protests in 2022, and a substantial portion settled before the formal hearing stage [5].
The honest answer: your odds are best with a factual error or very clear comparable sales. They're worst when the assessor's value sits inside the normal margin of error for mass appraisal, typically plus or minus 10 to 15 percent of market value, and you have no smoking-gun comparable.
Should you use a lawyer or consultant, or do this yourself?
For the informal review stage, you almost certainly do not need a lawyer or a contingency firm. The informal review is built to be usable by property owners without legal training. The issues are factual (is the square footage right, do comps support the value), not legal.
Contingency firms typically take 25 to 50 percent of your first-year tax savings as their fee [8]. On a $500 reduction in annual tax, that's $125 to $250 gone. On a $2,000 reduction, it's $500 to $1,000. If you can put together a one-page summary with three comparable sales, there's no reason to split that savings with anyone.
Professional help earns its keep in a few spots: large commercial properties, complex valuation disputes (income-approach properties like apartment buildings), or a case where the assessor has denied your informal request and you're heading into a formal hearing with an adversarial dynamic. At that level the stakes are high enough that a specialist's knowledge of local board procedures can pay for itself.
For residential homeowners, a well-prepared DIY approach beats a contingency firm on economics almost every time. If you want a structured walkthrough of gathering and submitting evidence, the TaxFightBack appeal kit packages exactly that into step-by-step form so you keep 100 percent of whatever reduction you win.
What if the assessor says no? Your options after an unsuccessful informal review
If the informal review goes nowhere, you still have the formal appeal, assuming you filed it or still have time. It goes to an independent body: a county board of equalization, a state board of tax appeals, a local assessment appeals board, or in some states a regular court.
The formal process has more teeth. The independent board can order a reduction the assessor refuses to grant. In many states the assessor carries some burden of proving the assessment is correct once you've shown evidence it isn't.
After the formal appeal, if you still don't get the reduction you believe is warranted, most states let you escalate to a state-level administrative body and then to the courts. Few residential cases go that far because the cost-benefit math usually stops them at the board level. But the path exists.
Some states put the informal step inside the required sequence. In Montgomery County property tax in Maryland, the informal review (called a "supervisor's conference") comes before the formal Petition of Appeal, and the conference itself is a required step [9]. Skipping it can affect your appeal timeline, so know your county's exact order.
One more thing. Even a partial reduction at the informal stage is real money. If the assessor offers to drop your assessed value by $20,000 but you think $40,000 is right, you can accept the $20,000 correction and still file a formal appeal for more in most states, though rules vary. Confirm this in your jurisdiction before accepting any partial offer.
State-by-state differences that change how this works
The informal review process varies more than most homeowners expect. Here's how key differences compare across major states:
| State | Informal review path | Appeal deadline (typical) | Who hears formal appeals |
|---|---|---|---|
| Texas | Informal meeting with appraisal district staff; required before ARB hearing | May 15 or 30 days after notice | Appraisal Review Board (ARB) |
| California | Informal meeting with county assessor's staff | Sept 15 or Nov 30, depending on county | Assessment Appeals Board |
| Illinois (Cook County) | Certificate of Error program; can run parallel to formal appeal | 30 days after assessment published | Cook County Board of Review |
| New York City | Informal online review via NYC Finance; then formal Small Claims Assessment Review (SCAR) | March 1 (most property classes) | NYC Tax Commission; SCAR court |
| Florida | VAB (Value Adjustment Board) petition; informal meeting optional | 25 days after TRIM notice | Value Adjustment Board |
| Georgia | Written appeal to board of assessors; informal discussion at same time | 45 days from assessment notice | Board of Equalization |
| Ohio | Complaint filed with county BOR; informal conference sometimes offered | April 1 of tax year | County Board of Revision |
Sources: Texas Tax Code Sec. 41.413 [5]; California Revenue & Taxation Code Sec. 1605 [4]; Georgia O.C.G.A. Sec. 48-5-311 [6]; Ohio Revised Code Sec. 5715.19 [10].
Every state allows some form of pre-formal-appeal conversation with assessing officials. The name, structure, and legal weight of that conversation differ. For counties like LA County property tax or Santa Clara property tax, California's September 15 deadline is the date to circle [4].
Common mistakes homeowners make during informal review
Getting emotional. The appraiser did not personally set out to overcharge you. They're running a mass appraisal model across tens of thousands of parcels with imperfect data. Anger closes the conversation. Calm specificity opens it.
Arriving without evidence. "This seems too high" is not a case. Three comparable sales and a corrected property record card is.
Asking for a dollar amount instead of presenting evidence. Lay out the facts and let the appraiser reach the conclusion. "I have three comps here that sold between $285,000 and $300,000; your assessment is $350,000. I'd like to understand how you got that number." That works better than "I want you to cut this by $50,000."
Missing the appeal deadline while waiting for the informal review to resolve. This is the most expensive mistake on the list. Always file the formal appeal if the deadline is within two to three weeks and you have no written reduction offer.
Accepting a reduction that's too small without checking whether you can still appeal. Get clarity on that before you sign anything.
Not getting the outcome in writing. If the assessor verbally agrees to reduce your assessment, ask for written confirmation before you leave or hang up. Verbal commitments sometimes don't survive the staff member's next week of workload.
Frequently asked questions
Does asking for an informal review pause my formal appeal deadline?
In almost all states, no. The formal appeal clock keeps running regardless of any informal conversations with the assessor. A few jurisdictions explicitly pause the deadline once an informal review is scheduled, but never assume yours does. If your deadline is approaching and you have no written commitment from the assessor, file the formal appeal to protect your rights.
Can I negotiate my property taxes down if I just bought the house?
Yes, and a recent arm's-length sale is strong evidence of market value in most states. If you paid $310,000 and the assessor values the property at $370,000, bring your closing disclosure to the informal review. California, Texas, and many other states treat a recent purchase price as presumptive evidence of market value, which puts real pressure on the assessor to adjust.
What is a property record card and how do I get one?
A property record card (sometimes called a field card or property data card) is the assessor's internal file on your property: square footage, bedroom and bathroom count, lot size, year built, and condition notes. Get it free from the assessor's website or by asking at the office. Checking it for factual errors is the first step in any informal review.
How long does an informal review with the assessor usually take?
The initial meeting typically runs 15 to 30 minutes. Getting a written response afterward takes anywhere from a few days to several weeks depending on the county's workload. Request your informal review early in the appeal window, ideally within the first two weeks of getting your assessment notice, to leave enough time to file a formal appeal if the talk doesn't resolve things.
Is there a fee to have an informal discussion with the assessor?
No. Informal review is free. Some jurisdictions charge a fee to file a formal appeal (typically $15 to $50), but the pre-appeal conversation with the assessor's office costs nothing. That's one reason to try it before paying a contingency firm 25 to 50 percent of your savings or spending money on a formal filing.
Can I bring a real estate agent or appraiser with me to the informal review?
Yes, in most counties. No rule bars bringing a licensed appraiser, real estate agent, or even a knowledgeable friend to an informal meeting. A licensed appraiser who can speak to comparable sales and condition adjustments strengthens your position considerably, though their fee may offset part of your savings on smaller reductions.
What happens if the assessor agrees to reduce my value but I think the new number is still too high?
In most states you can accept a partial reduction at the informal stage and still pursue a formal appeal for the remaining difference. Confirm this in your jurisdiction before signing any agreement, because some informal settlement documents include a waiver of further appeal rights. Read anything you're asked to sign before you accept it.
Can I do an informal review by email or mail, or do I have to go in person?
Many counties now accept written requests by email or mail, and some built online portals for it. Others prefer or require an in-person or phone appointment. Check your assessment notice or the assessor's website for the preferred method. If you submit by email or mail, keep copies and use delivery confirmation so you have a dated record of your contact.
What if I missed the appeal deadline and never requested an informal review?
Missing the formal appeal deadline generally closes your options for the current tax year. A narrow exception exists in some states for substantial clerical errors (wrong parcel, wrong owner, clearly incorrect data), which the assessor can correct administratively at any time under most state statutes. For value disputes, you usually have to wait for the next assessment cycle. Check your state's specific rules.
Does the informal review outcome set a precedent that limits my formal appeal?
Not usually. The informal review is not a formal adjudication, so it generally doesn't create binding precedent or limit what you can argue in a formal appeal. Some states treat a signed settlement agreement as a waiver of further appeal rights for that year, which is why you should read any written agreement carefully before signing.
How do I find comparable sales to bring to the assessor?
Pull sales from the last 6 to 12 months of homes within a mile of yours with similar square footage, age, condition, and lot size. Zillow's sold listings, Redfin, Realtor.com, and your county deed records are all free sources. The assessor will scrutinize whether your comps are truly similar, so choose carefully and be ready to explain any differences.
Can renters or landlords request an informal review, or is it just for owner-occupants?
In most states the right to contest an assessment belongs to the property owner of record, not a tenant. Landlords who own rental property have the same right to informal review as owner-occupants. For commercial property, the same process applies, though the evidence required (income approach data, capitalization rates) is more complex than for residential properties.
Sources
- International Association of Assessing Officers (IAAO), Standard on Assessment Appeals: Informal review is recommended as a best practice before formal appeal proceedings; filing an informal review does not automatically extend formal appeal deadlines in most jurisdictions
- IAAO, Standard on Mass Appraisal of Real Property: IAAO recommends informal review mechanisms as part of equitable assessment administration
- Cook County Assessor's Office, Certificate of Error Program: Cook County offers a Certificate of Error program allowing homeowners to obtain corrections without a formal appeal if the assessor agrees an error was made, applicable to current and prior years
- California State Board of Equalization, Revenue and Taxation Code Section 1605: California Revenue and Taxation Code Section 1605 requires county assessors to give property owners an opportunity to present evidence before values are finalized; a recent arm's-length sale price is treated as strong evidence of market value
- Texas Comptroller of Public Accounts, Property Tax Code Sections 25.25 and 41.413: Texas Tax Code Section 41.413 allows appraisal districts to correct errors informally before a hearing; Section 25.25 allows appraisal roll corrections for the current year; Texas appraisal districts collectively resolved over 700,000 property protests in 2022
- Georgia Department of Revenue, O.C.G.A. Section 48-5-311: Georgia O.C.G.A. Section 48-5-311 requires a 45-day window for written appeal to the board of assessors, after which a formal hearing is scheduled if the assessor does not agree
- Lincoln Institute of Land Policy, Property Tax Appeals research: Property owners who file formal appeals succeed in getting reductions roughly 40 to 60 percent of the time in well-studied jurisdictions, with higher success rates when professional evidence is presented
- Urban Institute, Property Tax Appeals and Regressivity research: Contingency firms typically take 25 to 50 percent of first-year tax savings as their fee for handling property tax appeals
- Maryland Department of Assessments and Taxation, Property Assessment Appeals Process: Maryland's supervisor's conference is an informal pre-appeal step that precedes the formal Petition of Appeal; its timing affects the overall appeal sequence in Montgomery County and elsewhere
- New York City Department of Finance, Property Assessment Appeals: NYC property owners can file an informal online review through NYC Finance before pursuing formal Small Claims Assessment Review (SCAR); March 1 is the key deadline for most property classes
- Florida Department of Revenue, Value Adjustment Board Process: Florida property owners have 25 days from the TRIM notice to file a VAB petition; an informal meeting with the property appraiser's office is optional before filing