How to Read Your Property Assessment Notice (and What to Check First)

The letter that shows up once a year with your county's opinion of what your home is worth is not a bill — it's a notice of value, and it's the only document that gives you a working window to contest that value before it hardens into your tax bill. Almost nobody reads it carefully, because it looks like paperwork. It shouldn't be treated that way: most jurisdictions start your appeal clock on the date the notice was mailed, not the date you opened it, and once that window closes, the number is locked in for the year regardless of whether it was right.

This is a field guide to that document — what each number on it means, the order to check things in, and where the deadline is usually hiding. Formats and terminology vary by state and even by county, so treat the specific field names below as a translation guide, not a literal template of what will land in your mailbox.

It's Not a Bill — It's Your Appeal Trigger

Two documents arrive from your local government over the course of the year, and they are not the same thing:

• The assessment notice (also called a notice of value, notice of appraised value, change of assessment notice, or TRIM notice depending on where you live) tells you what the assessor thinks your property is worth and, usually, the taxable value that will be used to calculate your bill. It is a proposal, and it comes with a deadline to challenge it.
• The tax bill arrives later, after tax rates are finalized, and reflects the assessed value that was never successfully appealed. By the time the bill lands, the value is generally locked for the year.

Texas's appraisal notices make this sequencing explicit: notices go out by April 1 for homesteaded property (May 1 otherwise), and the Texas Comptroller is direct about the deadline that follows — you generally have until May 15 or 30 days from the date the appraisal district mailed the notice, whichever is later, and that 30-day count runs "from the date the appraisal district mails a notice, not from the delivery date." Florida runs on a similar logic through its TRIM ("Truth in Millage") notice, which the Florida Department of Revenue confirms goes out in August and starts a roughly 25-day window to challenge the value with the county's Value Adjustment Board. Different states, same shape: a value notice, followed by a short and strict clock, followed by a bill that assumes you didn't act.

If you've already gotten as far as a tax bill, the appeal window for that year has usually already closed. The notice was the moment.

What It's Called Where You Live

The document itself goes by different names depending on your state and county — notice of value, notice of appraised value, change of assessment notice, notice of proposed property taxes, or (in Florida specifically) a TRIM notice. Some counties mail it separately from anything else; others combine it with a preliminary tax estimate on the same page. There is no single national format, which is exactly why it pays to read your specific notice line by line rather than pattern-matching to what a neighbor in another state received.

Field by Field: What the Numbers Mean

Notices vary in layout, but most contain some version of the following fields. Not every field appears on every notice — some states fold two of these into one line, and a few don't show all of them at all.

Market Value / Appraised Value

The assessor's estimate of what your property would sell for, as of a fixed valuation date (often January 1 of that year, though the exact date varies by state). This is the number most likely to get compared to a Zillow estimate, and the two are not calculated the same way — one comes from a statistical mass-appraisal model run across your whole neighborhood, the other from an automated valuation model with its own inputs. Our assessed value vs. market value guide covers why they diverge.

Assessed Value

The value your county actually uses as the starting point for tax calculations. In some states this equals market value (a "100% assessment" jurisdiction). In others it's a percentage of market value set by state law — the assessment ratio, covered next.

Assessment Ratio

The percentage applied to market value to arrive at assessed value, where one applies. If your state uses a ratio below 100%, an assessed value that looks far lower than what your home would sell for isn't a discount or an error — it's the ratio doing its job. Illustrative only: in a jurisdiction with, say, a hypothetical 50% ratio, a home with a $400,000 market value would show an assessed value around $200,000 — the ratio itself, not a sign anything is wrong. Your actual ratio, if any, should be stated on the notice or your assessor's site; if it's missing, that's worth a phone call rather than an assumption.

Exemptions Applied

Reductions to your taxable value for things like a homestead exemption, senior or disabled exemption, veteran status, or agricultural use. These should be itemized by name and amount. An exemption you qualify for but that isn't listed is one of the most common — and most fixable — errors on a notice.

Capped Value / "Capped" Line

Some states limit how much a property's assessed or taxable value can increase in a single year regardless of what the market did, often tied to a percentage or an inflation index. Where a cap applies, your notice may show both an uncapped market value and a lower capped value used for taxes — Florida's notice, for instance, is built around exactly this kind of homestead protection, per the Florida Department of Revenue. Whether your state has a cap, and exactly what it limits, varies — check your notice or your state revenue department's site rather than assuming a number carries over from another state.

Taxable Value

Assessed value minus exemptions. This is the figure your tax rate actually gets multiplied against, and it's often the smallest of the numbers on the page.

Millage Rate / Tax Rate

Sometimes shown on the notice itself — Florida's TRIM notice includes proposed rates from each taxing authority — and sometimes only appearing later on the separate tax bill once budgets are finalized. A millage rate is expressed as dollars of tax per $1,000 of taxable value; some states express the same idea as a percentage instead. Either way, this number is set through a local budget process, not by the assessor, which is why a flat or even lower assessment can still produce a higher bill. Our why did my property taxes go up post walks through that mechanism in detail.

The Five Checks, in Order

Work through these in this sequence — each one can make the next one irrelevant, so there's no point starting with number four. A factual error in your property description undermines everything downstream of it, while a deadline you've already missed makes the rest moot no matter what you find, which is why it still gets flagged early even though the filing itself comes last.

1. Is the property description right?

Square footage, bedroom and bathroom count, lot size, and year built all feed the valuation model that produced your number. A county record that overstates your square footage, credits you with a bathroom you don't have, or is missing a demolished structure will overstate your value no matter how accurate the market analysis otherwise is — and this is a surprisingly common, surprisingly overlooked error. See is your home's square footage wrong on county records for how to check and correct it.

2. Are your exemptions actually applied?

Compare the exemptions listed on the notice against what you believe you qualify for. Exemptions don't apply themselves in most places — you generally have to file for them once, and they can fall off after a refinance, a name change on the deed, or a county records error. A missing exemption is often worth more than a successful value appeal, and it's usually the easiest thing on this list to fix.

3. Did the assessed value jump more than local sales justify?

This is the substantive question. Pull recent sales of genuinely comparable homes near you — similar size, age, and condition, sold within the last several months — and compare what they actually sold for against what your notice implies your home is worth. A modest gap is normal; assessors work with ranges, and mass-appraisal models are not going to land exactly on every individual home. A gap that runs meaningfully above what comparable sales support is the kind of thing worth appealing; a gap that isn't there is a real answer too, and it means the honest move is to stop here rather than file anyway.

4. Is the assessment ratio applied correctly?

If your state uses a fractional assessment ratio, confirm the notice applied the right one to the right property type — owner-occupied and non-owner-occupied property are taxed under different ratios in some states, and an incorrect classification (say, your primary residence coded as a rental) can inflate your number even when the underlying market value estimate is fine.

5. What's the actual deadline, and where does it say to file?

The notice should state both. Read this section last only in the sense that it's item five on this checklist — not because it can wait. Note it now, because it's easy to lose track of once you start digging into comparable sales.

Where the Deadline Hides

The appeal deadline is usually printed on the notice itself, often in a paragraph of small type near the bottom or on the back — not headlined the way the dollar figures are. It is very often a different date from your tax payment due date, and confusing the two is one of the most common ways homeowners lose their appeal rights without realizing it.

Two verified examples of how differently this plays out by state:

• In Texas, the clock runs from when the appraisal district mailed the notice, not when you received or opened it — per the Texas Comptroller, you generally have 30 days from that mailing date (or May 15, whichever is later).
• In Florida, the Department of Revenue is explicit that an informal conversation with the property appraiser's office does not pause or extend the Value Adjustment Board petition deadline — the clock keeps running while you're trying to resolve things informally.

Your state and county will have their own version of this rule. Don't assume it matches either example above — read the notice, or check your county assessor's site, and don't let an informal conversation lull you into thinking the formal deadline moved. Our deadline table tracks verified county filing windows where we've been able to confirm them, and our guides cover county-specific processes in more depth.

If You Can't Find a Deadline on the Notice

Check, in order: the fine print on the back or bottom of the notice itself; the "appeals" or "how to protest" section of your county assessor's or property appraiser's website; and, if neither turns up a clear date, a direct call to the assessor's office. Deadlines are public information and staff are used to the question. Avoid relying on a search result or a forum post for the exact date — filing windows are sometimes measured in single-digit days, and getting it from the primary source is the only way to be certain.

Informal Review vs. Formal Appeal

Most jurisdictions offer two tiers, and the informal one is worth trying first because it's usually free and faster:

Informal review typically means contacting the assessor's or property appraiser's office directly — by phone, online form, or in person — and asking them to look again, often pointing to a specific factual error (wrong square footage, a pool that doesn't exist, a missing exemption). The Texas Comptroller describes this as an "informal conference" available before a formal hearing, and North Carolina's Department of Revenue similarly recommends contacting the tax office informally first, to "resolve the difference without filing a formal appeal."

Formal appeal is the structured process — a written petition, a filing deadline, and typically a hearing before a review board (an Appraisal Review Board in Texas, a Value Adjustment Board in Florida, a Board of Equalization and Review in North Carolina) if the informal step doesn't resolve things. This is where evidence matters most: comparable sales, photos, and a clear statement of what value you believe is correct.

Important nuance, confirmed directly by Florida's Department of Revenue: pursuing the informal route is not a prerequisite for the formal one in every jurisdiction, and trying informally first does not necessarily buy you extra time on the formal deadline. Treat the two as running in parallel, with the formal deadline as the one that actually matters if you're unsure.

Why Informal First Usually Makes Sense

Informal review is generally the cheaper and lower-effort option: it typically costs nothing to ask, requires no written petition, and can resolve simple factual errors — a wrong bedroom count, a missing exemption — in a single phone call or email. Formal appeals, by contrast, often involve a filing fee (sometimes waived for residential owner-occupants, sometimes not), a written submission with evidence, and a scheduled hearing. None of that effort is wasted if informal review doesn't work — it's simply the next step — but there's little downside to trying the free option first, provided you don't let it eat into your formal filing deadline.

What Happens After You File

Once a formal appeal is submitted, the general pattern (again, varying by county) runs something like this: the review board or a hearing officer schedules a date, you present your evidence (comparable sales, photos, corrected property facts), the assessor's office presents its basis for the original number, and a decision follows — sometimes the same day, sometimes by mail afterward. Possible outcomes are typically a reduced value, an unchanged value, or occasionally a value the board considers should be higher; check whether your jurisdiction allows that last outcome before filing, since it's not universal. If you disagree with the result, many states offer a further appeal to a state-level board or court, usually with its own separate deadline.

What to Do the Same Day Something Looks Wrong

If you spot an error while reading your notice, don't wait to gather everything perfectly before you start:

• Photograph anything that contradicts the notice — a bedroom count, a missing pool, storm damage, an addition that was never built. Date-stamped photos are useful evidence later.
• Write down what specifically looks wrong and why, while it's fresh: the exact figure on the notice, what you believe the correct figure is, and your source (a listing, a survey, a contractor's measurement).
• Pull your property record card — the underlying document your county assessor maintains with the detailed characteristics (square footage, room counts, lot size, condition ratings) that fed the valuation. This is usually available on the assessor's website or by request, and it's the document you'll actually need to dispute, since the notice itself is only a summary of what the record card contains.

None of this requires filing anything the same day. It just means capturing evidence before it's harder to reconstruct — a repair gets finished, a photo opportunity passes, or you simply forget the exact figure that first caught your eye. The record card in particular is worth requesting early: some counties take days to produce it, and you'll want it in hand well before any filing deadline, not the day before.

Keep a Simple Log

A one-page note is enough: the date you received the notice, the field that looked wrong, what you believe the correct figure is, and the deadline you found on the notice. If you end up filing formally, this becomes the starting outline of your case. If you end up not filing, it's still a useful record for next year's notice.

An Appeal Contests Value — Not the Tax Rate

This distinction trips up a lot of first-time filers. The appeal process that comes with your notice exists to argue that the value the assessor assigned to your property is wrong — too high relative to what it would actually sell for, or based on incorrect facts about the property. It does not let you argue that the tax rate is too high, that your local government spends too much, or that taxes in general have gone up.

If your bill increased because your city, county, school district, or another taxing authority raised its rate — while your assessed value stayed flat or even dropped — an appeal is the wrong tool, because there's no value dispute to make. That's a budget and political process, not an assessment one. See why did my property taxes go up for how to tell which mechanism actually hit your bill before you spend time on an appeal that can't address it.

A quick way to tell which one you're dealing with: if your assessed value on this year's notice is close to last year's (or lower) and your estimated taxes still climbed, look at the rate, not the value. If the assessed value itself jumped well beyond what the market did, that's a value question, and the notice in your hand is the document built to raise it.

The Bottom Line

None of the five checks above require special expertise — they require reading the notice slowly, once, against the actual facts of your property and actual recent sales near you. Most homeowners skip that step entirely and either pay whatever number arrives or appeal on instinct without evidence. Both are avoidable. The notice tells you the value, the deadline, and usually enough of the "why" to know whether a challenge is worth your time — the work is just in reading it properly before the window closes.

Quick Answers

Is a property assessment notice the same as a tax bill?

No. The notice states a proposed value (and often a taxable value) and comes with a deadline to dispute it. The tax bill comes later, is calculated once rates are finalized, and generally assumes the notice went unchallenged.

What if I never received a notice?

Mailing requirements vary by state, but most assessors don't require proof you personally read it — only that it was mailed to the address on file. If you never got one, check your county assessor's website for your current value and deadline, and update your mailing address for next year. Our county guides list assessor sites by area.

Does an assessment notice affect my mortgage escrow?

Not directly and not immediately. Escrow is typically based on your most recent tax bill, not the proposed value on a notice. If an appeal later reduces your assessment, the change generally flows through on a future bill and escrow adjustment, not right away.

My notice has no assessment ratio or millage rate listed — is that normal?

It can be. Some states show only market value, assessed value, and exemptions on the notice itself, with the rate applied later on the separate tax bill. If you can't find a ratio or rate anywhere and want to confirm one applies in your area, your assessor's office or state revenue department's site is the source to check — don't assume a rate from a different state applies to you.

Can I appeal just to lower my tax rate?

No — the appeal process addresses value, not rate. If your rate rose, that's a local budget decision, generally worked out through public hearings and elected officials, not the assessment appeal process.

Do I need a lawyer or a tax consultant to appeal?

Not for a typical residential appeal in most jurisdictions — the process is generally designed for homeowners to file themselves, with a form and comparable-sales evidence. Larger commercial properties or complex disputes are where professional representation becomes more common.

What if my county's notice doesn't list a phone number or website?

The notice should include contact information for the issuing office, but if it doesn't, your county government's main website almost always has an assessor, appraiser, or property tax department listed, along with the appeals process for that jurisdiction.

Go Deeper

• Assessed value vs. market value — why your notice's number and a Zillow estimate were never meant to match.
• Why did my property taxes go up when my home value didn't? — the rate-driven increases an appeal can't fix.
• Is your home's square footage wrong on county records? — the single most common factual error hiding in a property record.
• County deadline table and county guides — verified filing windows and step-by-step processes where we've confirmed them.

Once you've read through your notice and flagged anything that looks off, the fastest way to find out whether it's worth pursuing is to check the underlying number against actual sales. Grove Hopper's free check compares your assessed value against recent comparable sales near you and surfaces your county's filing details in a couple of minutes — no account, no charge, and an honest "no case" answer when the math doesn't support one. Grove Hopper doesn't file appeals on your behalf or provide legal advice; you review the numbers and, if you decide to proceed, you file with your county yourself.