You open your Texas appraisal notice and see a market value that has climbed sharply since you bought the property. Then you look at the assessed or taxable value and find a much lower figure. Your first thought is usually that the county made a mistake. Your second is that the lower number must be permanent.
Neither assumption is safe.
The difference between market value vs assessed value is central to understanding your Texas property tax bill. Market value describes what the appraisal district believes your property could sell for. Assessed value reflects the amount left after Texas rules, homestead limits, and exemptions affect the tax calculation. Those figures can move at different speeds, and the gap can either protect you or hide a future increase.
Why Your Appraisal Notice Shows Two Different Numbers
Suppose you bought a home in Austin two years ago. The appraisal notice shows that the property's market value rose by 18%, but the taxable figure increased by only 10%. You may wonder whether the county used the wrong number or whether the notice contains a clerical error.
Usually, it doesn't. The notice is showing two stages of the same tax process.
The appraisal district must estimate the property's market value as of January 1. That figure reflects the district's opinion of the home's current economic worth. The tax-bearing number can be lower because a qualifying homestead may receive a statutory cap, and exemptions can reduce the amount that local taxing units use to calculate taxes.
Practical rule: A higher market value doesn't automatically create an equal increase in your taxable value.
The larger number attracts attention because it resembles a sales price. But homeowners don't calculate their tax bill by multiplying market value directly by a tax rate. They need to identify the number after caps and exemptions have been applied. That's the figure that determines the tax burden.
Why the gap matters
Texas law requires appraisal districts to appraise taxable property at market value as of January 1. For a homestead, however, the assessed amount can be limited by the homestead cap. The cap applies to the prior year's assessed value, not to the market value figure itself, so a fast-rising market can produce a substantial spread between the two.
That spread isn't necessarily a windfall. It can reflect a valid homestead protection, an exemption, the timing of a purchase, or an incomplete exemption record. It can also change after ownership transfers, when the cap may no longer protect the property in the same way.
The first step is to read the notice as a calculation pipeline rather than as a single valuation. The Texas appraisal notice guide can help you identify the values, exemptions, and deadlines shown on the document. Once you know which figure drives the bill, you can decide whether the problem is an inflated market value, a missing exemption, or a taxable value that was calculated incorrectly.
Market Value vs Assessed Value Explained
Market value and assessed value answer different questions. Market value asks what the property is worth in the market. Assessed value asks how much value the law allows the taxing system to use.
Texas appraisal districts estimate market value as of January 1 through mass appraisal methods, property data, and market evidence. Assessed value is a legal and administrative figure shaped by caps and exemptions. It may be materially lower than market value for a qualifying homestead, but it isn't the number you should use to estimate a likely sale price.
Market Value vs Assessed Value at a Glance
| Attribute | Market Value | Assessed Value |
|---|---|---|
| Primary purpose | Estimates what the property could sell for on the open market | Establishes the value used in the property tax calculation |
| Valuation date | Texas appraisal districts value property as of January 1 | Reflects the market value calculation after applicable statutory limits and exemptions |
| Main evidence | Comparable sales, property characteristics, condition, and local market data | Prior assessed value, homestead limitations, and qualifying exemptions |
| Effect of a homestead cap | The cap doesn't restrict this figure | The qualifying homestead amount may be limited under Texas law |
| Effect of exemptions | Exemptions don't change the property's economic worth | Exemptions can reduce the value subject to taxation |
| Use in a sale | Helps describe the property's economic worth | Doesn't set the negotiated sale price |
| Best number to challenge | Challenge this figure when the district's market opinion is too high | Review this figure when caps or exemptions weren't applied correctly |
A common mistake is protesting the lower figure just because it appears on the notice. If your market value is wrong, that error can eventually affect the tax calculation. If your market value is reasonable but the homestead cap or exemption is missing, the protest strategy is different.
Economic estimate versus legal construct
Market value responds to current conditions. A buyer may care about location, condition, competing listings, and recent sales. The appraisal district uses its own valuation model, and that model can misstate a property when its records contain an incorrect building size, condition rating, or feature.
Assessed value follows a separate legal path. In Texas, the amount can stay below market value because the homestead cap limits annual growth from the prior assessed value. Exemptions then reduce the taxable base according to their own eligibility rules.
That's why a lower assessed value isn't proof that the district got market value right. It may show that a cap or exemption is working. Use the definition of assessed value to separate the economic estimate from the tax-limited amount before gathering evidence for a protest.
How Texas Appraisal Districts Calculate Your Assessed Value
The calculation starts with market value, not with the number on last year's tax bill. Texas law requires appraisal districts to appraise property at market value as of January 1. The district then applies the rules that determine the assessed and taxable figures.
The four-stage pipeline
The district establishes market value. Appraisers use property records, comparable sales, and mass appraisal models to estimate what the property would be worth on January 1. The quality of this stage depends on accurate data about the parcel and reasonable treatment of comparable properties.
The appraisal district determines the appraised value. The market value estimate becomes the starting point for the property's appraisal treatment. Certain property categories, including property receiving a productivity valuation, can follow different rules, so the owner must verify the classification shown in the records.
The district applies exemptions. A homestead exemption, an Over-65 exemption, or a Disabled Veteran exemption can reduce the amount subject to taxation when the owner qualifies and the exemption is properly recorded. These provisions don't reduce what the home could sell for. They reduce the tax base.
The district applies caps and limits. For a qualifying homestead, the assessed value is generally limited to the prior year's assessed value plus a maximum annual increase of 10%. The cap doesn't restrict the market value figure, which can rise or fall based on current conditions.
Williamson CAD describes the mechanics directly. The homestead cap uses the prior year's assessed value plus 10%, while the market value figure can change by any amount. That distinction is why a notice can show a market value that rises much faster than the amount used for taxation.
Where owners should look for errors
Each stage creates a different review question. Check the property record for incorrect square footage, construction details, condition, or features. Review the notice for the homestead designation and other exemptions. Then compare the current assessed value with the prior year's figure to see whether the statutory limit appears to have been applied.
Property owners and investors also need to understand the underlying valuation method. A clear explanation of property valuation methodology can help you identify whether your evidence challenges the district's market opinion or only the later tax treatment.
For investors evaluating a purchase, this distinction belongs in the underwriting file. A resource on Texas real estate investment can provide broader context, but the property tax analysis still has to account for ownership status, exemptions, and the local appraisal record.
The Hidden Gap Between Market Value and Taxable Value
A Texas homeowner can open an appraisal notice and see market value climbing while taxable value remains substantially lower. Travis County's 2025 median residential homestead market value was $519,677, compared with a median taxable value of $401,879. That separation reflects homestead protections and exemptions, not a calculation error. The comptroller guidance cited earlier explains how these values serve different purposes.
The cap can protect you, but it can also mislead you
The 10% homestead cap limits how quickly a qualifying homestead's assessed value can rise from one year to the next. It does not limit the market value shown by the appraisal district. That creates the Texas-specific gap homeowners often see: market value can rise sharply, while the capped assessed value increases more slowly.
Treating that lower assessed value as a permanent benefit is a mistake. The gap can narrow or disappear after a change in ownership, an exemption lapse, or another change in eligibility. A new owner may not receive the prior owner's full tax-limited position, and a homestead designation may require action after a move or change in use.
Local tax rates still apply to the taxable base. A cap can slow the increase in value used for taxation, but it does not guarantee a lower bill when taxing units raise their rates.
The reverse can occur as well. Recent Texas coverage reported that median assessed value rose 8.25% while median market value was nearly flat at 0.02% from 2024 to 2025, an 8.23 percentage-point difference between the two movements (Ownwell's Texas assessed and market value analysis). Reassessment timing, exemption changes, caps, and local appraisal practices can push the two figures in different directions.
A lower taxable value helps only if you know why it is lower and whether the protection still applies.
Ownership records matter
Property taxes follow the legal ownership record. A deed transfer, exemption filing, or change in use can alter how the appraisal district treats the parcel. Anyone handling a purchase, transfer, estate issue, or ownership correction should review Texas property deeds and taxes before assuming the existing tax treatment will continue.
Check the record before reacting to the headline value. Determine whether the district overstated market value, failed to apply the cap, missed an exemption, or correctly calculated a taxable value that changed because of a triggering event.
Real Calculations Using Travis County Numbers
A Travis County homeowner can see a $519,677 median residential homestead market value alongside a $401,879 median taxable value for 2025, per the same comptroller guidance referenced above. The gap is real, but neither figure alone determines the final tax bill.
Start with the two values
Use the Travis County median as a reference:
- Market value: $519,677, the district's estimate of the property's worth as of January 1.
- Taxable value: $401,879, the median amount remaining after applicable tax treatment.
- Difference: The amount separating the market estimate from the taxable base.
The calculation is:
$519,677 minus $401,879 equals $117,798.
That $117,798 difference is not cash in the owner's pocket, and it does not make market value irrelevant. It shows that the tax calculation for this median homestead example does not apply directly to the full market estimate. In Texas, the homestead cap can create this gap, so a rising market value does not automatically produce the same increase in taxable value.
Apply the rate shown on your bill
Your bill depends on the taxable value and the combined rates charged by the property's taxing jurisdictions. Texas has no single statewide rate for every property. Read the taxing entities and rates printed on your statement, rather than substituting a generic Austin rate.
Local rates can raise the bill even when the taxable value stays unchanged. An Over-65 exemption or another qualifying exemption may reduce the taxable base further, depending on the exemption, taxing unit, and owner's eligibility. Check each exemption line instead of estimating from market value.
Ownership changes alter the math
An investor-owned rental generally does not receive the homestead protection available to a qualifying primary residence. If a property changes from an owner-occupied homestead to a rental, or transfers to a new owner, its prior cap-limited history may no longer produce the same result. Investors should model the tax position after the transaction instead of relying on the seller's current bill.
Buyers face the same issue. A seller's low taxable value may reflect a personal exemption or a cap that will not apply to the next owner in the same way. Review the ownership and exemption records before treating that taxable value as your future tax base.
When and How to Challenge Your Property Valuation
Challenge the number that is wrong. That sounds obvious, but many owners protest without deciding whether the evidence attacks market value, assessed value, or the exemption record.
If the appraisal district's market estimate is too high, build a case around comparable sales and property-specific facts. If the market value is defensible but the taxable figure ignores a homestead cap or exemption, focus on the calculation and eligibility record instead.
Build evidence that matches the dispute
A credible protest usually needs more than a list of nearby sale prices. The strongest evidence explains why the selected properties are comparable and what adjustments account for differences.
Use the following review:
- Property characteristics: Verify the district's square footage, lot information, age, condition, rooms, improvements, and features.
- Comparable sales: Select properties that resemble yours in location, size, age, condition, and quality. A renovated property shouldn't be treated as interchangeable with one needing substantial work.
- Condition documentation: Use photographs, inspection material, repair records, or contractor estimates when the property has defects the district's record overlooks.
- Exemption records: Confirm that every exemption you qualify for appears correctly and applies to the relevant taxing units.
- Calculation history: Compare prior and current values to identify whether a cap was applied, removed, or reset.
Texas property tax consultants operate in a regulated field. The Texas Department of Licensing and Regulation maintains a public roster of licensed Property Tax Consultant professionals (TDLR's licensed consultant roster). That licensing structure matters because a protest involves deadlines, valuation evidence, procedural choices, and representation before the appraisal review process.
INTELLI uses licensed property tax consultants and employs a data-first approach, using public and private data to build evidence for protests and exemption work. That differs from a software-only filing model that may submit generic comparable sales without examining the property record, ownership history, condition, or exemption status.
Decide whether to file alone
Handle a straightforward record correction yourself if you can document the error and meet the filing requirements. Bring in licensed representation when the property is complex, the valuation is material, the ownership structure is changing, or you don't have time to prepare a defensible evidence package.
Don't wait until the deadline is close. The appraisal notice identifies the applicable protest information, and the appraisal district or review board controls the process. Read the notice as soon as it arrives, gather evidence early, and target the precise figure that drives the disputed tax.
Your Action Plan for Lowering Texas Property Taxes
Start this week with the record, not the bill. Pull the appraisal notice, prior-year values, exemption information, and property record. Then work through the following order.
Verify homestead status. Confirm that the property is classified as your qualifying residence and that the homestead treatment appears on the record.
Check age and disability exemptions. Review eligibility for Over-65, Disabled Person, and Disabled Veteran exemptions. These programs have distinct requirements, and a missing filing can leave the tax base higher than necessary.
Review special-use possibilities. Agricultural and historic designations may apply in specific circumstances. Solar-related treatment and other property-specific exemptions also deserve review where applicable.
Inspect the valuation evidence. Compare the district's market estimate with similar sales. Check the physical record for incorrect measurements, features, condition, or improvement data.
Track the protest requirement. Use the appraisal notice to confirm the filing deadline and submission method. A well-supported protest filed late is still a missed opportunity.
A tax recovery audit can uncover past overcharges or missed exemptions, but you should treat that review as a separate task from the current-year protest. Homeowners can file independently when the issue is clear. Investors and commercial owners should consider professional help when the property record, valuation model, ownership structure, or exemption history is difficult to untangle.
The central question isn't whether market value is higher or lower than assessed value. It's whether the appraisal district applied the right value, cap, exemption, and ownership treatment to your property.
INTELLI reviews Texas property valuations, prepares evidence for protests, verifies exemptions, and uses licensed property tax consultants with public and private data. Visit INTELLI to review your property tax position and decide whether your market value, assessed value, or taxable value needs action.