You opened your Notice of Appraised Worth from HCAD and encountered four distinct dollar amounts attached to your residence. Market figure. Appraised determination. Assessed total. Something referencing a statutory cap. These designations sound interchangeable at first glance, but they represent fundamentally different concepts — and the distinctions between them are precisely where your annual obligation gets calculated. According to the Texas Comptroller's Assistance Division, comprehending these four interconnected numbers constitutes the single most consequential prerequisite before deciding whether to initiate a formal challenge.
The 4 Terms That Matter
1. Market Value
What it represents:
Specifically, this is the price the Harris County Appraisal District (HCAD) believes your dwelling would command on the open market as of January 1 of the relevant year. According to Texas Tax Code §1.04(7), this determination is predicated on what a willing buyer would pay a willing seller under normal conditions, absent any duress or unusual motivating circumstances.
How it impacts your taxes:
In addition, this figure serves as the foundational starting point from which all subsequent calculations derive. HCAD establishes this number using recent comparable transactions in your neighborhood, physical characteristics, and computerized mass appraisal models. Every downstream computation — the cap, exemptions, and ultimately your bill — flows from this initial determination.
Common misconception:
"The market figure on my notice reflects what my house would genuinely sell for." Not necessarily. HCAD's market determination relies on mass appraisal methodology, which can produce estimates either above or below what an actual purchaser would ultimately offer. Licensed real estate agents and independent fee appraisers frequently arrive at substantially different conclusions. To illustrate, across Texas, central appraisal district estimates regularly diverge from recorded transaction prices by meaningful margins.
2. Appraised Value
What it represents:
Moreover, this is the determination HCAD assigns to your parcel for official purposes. For the vast majority of residential dwellings, this figure coincides with the market determination. However, if you hold agricultural or other special-use designations, or if the district applies adjustments for condition or depreciation, the appraised amount can diverge from the market figure.
How it impacts your taxes:
As a result, this is the specific number you challenge when filing a dispute. When you initiate a formal contest, you are asserting that the appraised determination exceeds what the supporting documentation shows. If the appraisal district's representative or the Review Board concurs with your evidentiary presentation, this figure is reduced accordingly.
Common misconception:
"The appraised determination and market figure are identical." For the majority of homeowners, these figures happen to coincide numerically, which explains why people routinely conflate them. Nevertheless, they constitute legally distinct concepts under Texas Tax Code — serving different functions within the calculation hierarchy. Your appraised determination can never exceed your market estimate, but it can be lower due to agricultural exemptions, special-use designations, or condition-based depreciation adjustments.
3. Assessed Value (aka "Cap Value")
What it represents:
For this reason, if you have a homestead exemption, Texas law constrains how much your capped appraisal can escalate in any given year — specifically, a maximum of 10% above the preceding year's assessed amount. According to Texas Tax Code §23.23, this statutory ceiling applies automatically to homesteaded residences without requiring any additional filing or action. The resulting assessed figure is the number upon which your levies are ultimately calculated, after the cap limitation has been applied.
How it impacts your taxes:
Consequently, this is the number that directly determines your annual obligation. Your applicable rate gets multiplied by your assessed figure (minus any qualifying exemptions) to produce the total amount you owe. Even if HCAD raises your appraised determination by 30%, your assessed figure can only increase 10% from the prior year's baseline — providing a meaningful restraint during periods of rapid appreciation.
Common misconception:
"The 10% cap means my taxes can only escalate by 10%." In reality, the cap constrains only the assessed figure increase, not the overall levy increase. If your local taxing jurisdictions simultaneously raise their rates through their independent budgetary processes, your combined burden can escalate by substantially more than 10% even with the cap fully in effect. According to the Texas Comptroller, rates and assessed figures are established through entirely separate governmental procedures.
4. Taxable Value
What it represents:
Notably, this equals your assessed figure minus the aggregate of all qualifying exemptions (homestead exemption, over-65 freeze, disabled veteran credit, etc.). This is the terminal number in the calculation chain — the specific figure that gets multiplied by each taxing jurisdiction's applicable rate.
How it impacts your taxes:
To illustrate, a standard homestead exemption subtracts a flat dollar amount from your assessed figure before the computation occurs. If your assessed figure is $297,000 and you hold a $140,000 homestead exemption for school district levies, you only pay school taxes on the remaining $157,000 — representing a substantial reduction in your effective annual burden.
Common misconception:
"I filed for homestead so my whole value is protected." The homestead exemption reduces your taxable value by a fixed amount — it does not eliminate your tax bill or cap your value at what you originally purchased the home for.
How They Flow Together
In addition, understanding the sequential relationship between these four interconnected figures is essential, because each one feeds into the next in a deterministic cascade that ultimately produces your annual obligation:
Market Value
HCAD's estimate of sale price
Appraised Value
Usually equals market value for homes
Homestead Cap Applied: max 10% increase over prior year
Assessed Value
The capped number
Minus Exemptions: homestead, over-65, etc.
Taxable Value
× Tax Rate from each taxing entity
Your Tax Bill
The critical insight: you can only challenge the top of this sequential chain. You contest the appraised determination. The statutory cap, qualifying exemptions, and applicable rates are established by law or by your local taxing jurisdictions through their independent governance processes. You cannot dispute those downstream components. “Homeowners frequently come to hearings wanting to argue about their tax rate,” notes Dale Craymer, President of the Texas Taxpayers and Research Association (TTARA). “But the only lever they can pull at the appraisal district level is the property's appraised figure.”
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Check Your Property FreeWorked Example: A Hypothetical Harris County Home
Specifically, let's walk through a realistic scenario to see how all four figures work together.
The residence: A hypothetical 2,100 sq ft home in a Harris County subdivision. The homeowner has a homestead exemption and has owned the dwelling for several years.
| Step | What Happens | Amount |
|---|---|---|
| Market Value | HCAD estimates what the home would sell for based on comparable sales in the neighborhood | $350,000 |
| Appraised Value | HCAD sets this slightly below market value based on property condition adjustments | $320,000 |
| Prior Year Assessed | Last year's capped value (already on file) | $270,000 |
| Current Assessed | The 10% cap kicks in: $270,000 × 1.10 = $297,000. Because $297,000 is less than the $320,000 appraised value, the cap saves the homeowner here | $297,000 |
| Taxable Value | For simplicity, we'll use the assessed value before entity-specific exemptions | $297,000 |
| Tax Rate | Combined rate across all taxing entities (county, school district, MUD, etc.) | ~2.3% |
| Tax Bill | $297,000 × 0.023 | ~$6,831 |
What the cap did in this example: Without the homestead cap, taxes would have been calculated on $320,000 (the appraised value), producing a bill of roughly $7,360. The 10% cap reduced the taxable basis by $23,000 and kept approximately $529 in the homeowner's pocket.
What a successful protest could do: If this homeowner protested and got the appraised value reduced from $320,000 to, say, $290,000, it would not change the current year's tax bill at all — because the capped assessed value of $297,000 is already below $290,000's cap path. But it would help in future years by narrowing the gap between the appraised and assessed values. That gap matters because it represents stored increases that can compound over time.
Four Things People Get Wrong
Myth 1: "My appraised determination went down, so my taxes should drop correspondingly."
Not automatically. If a differential exists between your appraised determination and your capped evaluation, a decrease in the appraised figure might not penetrate to your assessed baseline at all. Critically, your annual obligation derives from the assessed amount, not the appraised determination. Until the appraised figure descends below the assessed threshold, a reduction in appraisal produces zero impact on your current-year bill. Nevertheless, narrowing that differential still carries meaningful implications for future billing cycles.
Myth 2: "The market figure on my notice represents what I could actually sell my residence for."
Similarly, HCAD employs computerized mass appraisal models to generate market estimates for over a million parcels simultaneously. Importantly, they are not conducting an individualized inspection or personalized appraisal of your specific dwelling. Their algorithmic output can be substantially higher or lower than what a motivated purchaser would actually pay in an arms-length transaction. If your residence has deferred maintenance, unconventional architectural features, or fronts a heavily trafficked thoroughfare, the district's market figure may materially overstate what a genuine buyer would offer. That divergence between algorithmic estimate and realistic transaction price constitutes one legitimate basis for initiating a formal challenge.
Myth 3: "I can protest my tax rate."
By contrast, you cannot. The rate is set by each taxing jurisdiction (school district, county, city, MUDs, hospital district, etc.) through their own budget and public hearing process. What you can dispute is the figure HCAD places on your residence. Lower figure, same rate, lower bill.
Myth 4: "Contesting will flag my home and trigger a retaliatory increase next year."
For this reason alone, this misconception represents the single most common reason homeowners forgo filing a challenge, and it is categorically false. Texas statute explicitly prohibits elevating a dwelling's appraisal solely because the owner exercised their right to appeal. HCAD reappraises every parcel annually using identical computerized mass appraisal methodologies regardless of whether the homeowner contested the prior year's determination. The worst conceivable outcome of initiating a dispute is that the appraised figure remains precisely unchanged. There is genuinely no downside risk whatsoever.
Glossary of Secondary Terms
NOAV (Notice of Appraised Value)
The annual notice HCAD dispatches to homeowners, typically arriving in mid-April, displaying the proposed figures for the upcoming year. This document serves as your procedural starting gun — it communicates what the appraisal district believes your residence is worth and simultaneously triggers the countdown toward your filing deadline to initiate a formal contest.
iFile
HCAD's online system for filing a property tax protest electronically. Available at owners.hcad.org. You'll need your property account number and iFile number (found in the upper right corner of your Notice of Appraised Value). First-time users who lost their notice can retrieve their iFile number at features.hcad.org by scanning their Texas driver's license.
iSettle
HCAD's online informal settlement tool. After you file a protest, HCAD may offer you a reduced value through iSettle before a formal hearing. There is no counter-offer mechanism — it is accept or reject only. You can accept or reject the offer up to the day before your formal ARB hearing, typically giving you about 3 weeks to decide.
ARB (Appraisal Review Board)
An independent panel of citizens that hears property tax protests when the homeowner and HCAD cannot reach an agreement informally. The ARB conducts formal hearings and issues binding decisions on value disputes. Hearings are typically 15 minutes and conducted via Cisco WebEx videoconference or in person at the HCAD building.
Equity Argument
A dispute strategy where you argue that your dwelling is appraised higher than analogous homes in your area. Even if HCAD's figure is close to actual market worth, if similar residences nearby are appraised for less, you can argue that your evaluation is unequal. Texas law allows this as a separate ground for appeal.
Homestead Exemption
A benefit available to Texas homeowners who use their real estate as their primary residence. It provides a $140,000 reduction in taxable worth for school district levies (increased from $100,000 in November 2025 via Proposition 13) and caps annual assessed increases at 10%. Seniors and disabled homeowners receive an additional $60,000, for a total school exemption of $200,000. You must apply for it — it is not automatic.
Comparable Properties (Comps)
Homes similar to yours in size, age, condition, and location that are used to support or challenge an appraised figure. In a contest, you present comps that sold for less (or are appraised for less) than your dwelling to argue that your determination should be reduced.
Dollar Per Square Foot ($/sq ft)
A common metric for comparing real estate valuations. Calculated by dividing the appraised or sale price by the total living area. If your home is valued at $160/sq ft but equivalent residences in your neighborhood are appraised at $140/sq ft, that gap can support a challenge.
Key Dates to Remember
The valuation date. HCAD determines your property's value as of this date each year.
NOAVs are mailed out (typically).
Deadline to file your protest (or 30 days after your NOAV is delivered, whichever is later). Miss this and you lose your right to challenge this year's values.