What Is Ad Valorem Tax in Texas: Calculation, Exemptions, and Protests

Ad valorem tax in Texas is a tax on the assessed value of property you own, and it’s the main way local governments pay for schools, roads, police, fire service, and county operations. “Ad valorem” is Latin for “according to value,” so the more your property is worth, the more you pay. Because Texas has no state income tax, counties, cities, school districts, and special districts lean heavily on this one revenue source. Every county in the state runs the same yearly cycle: the appraisal district sets a value in January, you have a window to protest, local units adopt rates in the fall, and bills come due by January 31 of the following year.

What Property Is Taxed

Texas counties and school districts tax all nonexempt property inside their boundaries.1Texas Comptroller. Property Tax System Basics Two broad categories are in play.

Real property covers land and anything permanently attached to it: single-family homes, apartment buildings, commercial and industrial buildings, vacant lots, and oil and gas interests. Business personal property covers tangible assets a business uses to produce income, including inventory, furniture, equipment, and machinery.2Texas Comptroller of Public Accounts. Property Classification Guide

Personal belongings kept at home, like clothing and household furniture, are not taxed. The dividing line is commercial use. A laptop you use for personal email isn’t taxable; the same laptop sitting on a desk in your company’s office is.

How Your Tax Bill Is Calculated

Three numbers drive every bill: appraised value, exemptions, and the tax rate. The county appraisal district sets your property’s market value as of January 1 each year.3Texas Comptroller of Public Accounts. Texas Code Property Tax Law Deadlines Any exemptions you qualify for come off the top, leaving a taxable value. Each local taxing unit then applies its own rate to that taxable value.

Rates are expressed per $100 of value. To find what you owe one unit, divide the taxable value by 100 and multiply by that unit’s rate. On a home with a taxable value of $200,000 after exemptions and a school district rate of $1.05 per $100, the school portion is $2,100. You do that math for every unit that covers your property, typically a school district, county, city, and one or more special districts. The total is your annual bill.

A worked example makes the exemption effect clear. A home appraised at $300,000 with $140,000 in homestead exemptions has a taxable value of $160,000 for school purposes. At a combined rate of $2.50 per $100, the owner owes $4,000. Without the exemption, the same home would generate a $7,500 bill.

Two different offices handle this work. The county appraisal district values your property and processes exemption applications. The county tax assessor-collector mails bills and collects payment. If you have a question about value, you call the appraisal district; if you have a question about the bill itself, you call the tax office.

The Annual Tax Calendar

The dates below repeat every year, and missing them has real consequences.

  • January 1: Your property’s market value is fixed for the year, and a tax lien automatically attaches to secure payment.3Texas Comptroller of Public Accounts. Texas Code Property Tax Law Deadlines
  • April through May: The appraisal district mails notices of appraised value.
  • May 15 or 30 days after your notice is mailed, whichever is later: Deadline to file a protest with the Appraisal Review Board.4Texas Comptroller. Appraisal Protests and Appeals
  • Late summer to early fall: Local taxing units adopt their rates based on approved budgets.
  • October through November: Tax bills go out.
  • January 31: Payment deadline. Anything unpaid on February 1 is delinquent.5Texas Comptroller. Paying Your Taxes

Homeowners who are 65 or older, disabled, or disabled veterans (or the unmarried surviving spouse of one) can split their payment into four equal quarterly installments without penalty or interest. Owners of property damaged in a designated disaster or emergency area may also use installments.6Texas Comptroller. Payment Options

Exemptions That Lower Your Taxable Value

Exemptions are the most direct way to cut your bill. They reduce taxable value before any rate is applied, and you generally have to apply for them through your county appraisal district.

Residence Homestead

If you own and live in the home as your primary residence, school districts must exempt $140,000 of its appraised value. Texas voters approved that increase from the previous $100,000 figure in November 2025. Counties that collect farm-to-market or flood control taxes must provide a separate $3,000 homestead exemption, and any taxing unit can adopt an optional exemption of up to 20 percent of appraised value, with a $5,000 floor.7Texas Comptroller. Property Tax Exemptions

Age 65 or Older and Disabled Homeowners

Homeowners who are 65 or older, or who have a qualifying disability, get an additional $60,000 school district exemption on top of the standard homestead amount. Other taxing units may offer their own additional exemptions, with a $3,000 minimum if adopted. Seniors and disabled homeowners also get a tax ceiling on school taxes: once the exemption is in place, the school tax amount is frozen and cannot rise unless you add improvements.

Disabled Veterans

Veterans with a VA disability rating get a partial exemption that scales with the rating:8Texas Veterans Commission. Property Tax Exemptions Available to Veterans Per Disability Rating

Veterans 65 or older with at least a 10 percent rating, or who are blind or have lost the use of a limb, get the full $12,000 regardless of actual rating.

Agricultural and Timber Productivity Valuation

Land used mainly for farming, ranching, or timber production can be appraised on what it produces rather than what it would sell for. The savings can be dramatic. A hundred acres of ranchland might have a market value of $500,000 but a productivity value of $15,000.10Texas Comptroller. Agricultural Use – Productivity Appraisal The catch is a rollback tax. If the use changes, the owner owes the difference between taxes paid under productivity valuation and taxes that would have been paid at market value for the three preceding years, plus interest.11Collin Central Appraisal District. What Happens If Land Receiving an Agricultural Appraisal Changes to a Non-Agricultural Use

The 10 Percent Homestead Appraisal Cap

When the market surges, a homesteaded property’s appraised value cannot rise by more than 10 percent per year, plus the value of any new improvements.12Texas Comptroller. Valuing Property The cap kicks in the second year the exemption is in place. It doesn’t change the district’s opinion of market value; it limits the assessed value used to calculate tax. In a hot market, the gap between the two can grow large. It closes when you remove the homestead exemption or sell, because the cap resets for the next owner.

Protesting Your Appraised Value

Filing a protest is the single most effective thing you can do to control your bill, and it costs nothing. You can protest if you believe the district overvalued the property, applied the wrong exemptions, or has errors in the property’s description such as square footage, bedroom count, or lot size.4Texas Comptroller. Appraisal Protests and Appeals

The deadline is May 15 or 30 days after the district mails your notice, whichever is later. The 30-day clock starts on the mailing date, not the date you actually receive the notice.

Most districts offer an informal meeting first, often by phone or video, where you walk through your evidence with a district appraiser. If the appraiser agrees to a lower value, the protest ends there. If you can’t reach agreement, the case goes to a formal hearing before the Appraisal Review Board, a panel of independent citizens who hear both sides and issue a written order. You can appeal that order to district court or, for homes valued at $1 million or less, to binding arbitration.

The ARB will not visit your property, so your evidence has to carry the case.13Texas Comptroller of Public Accounts. How to Present Your Case at an Appraisal Review Board Hearing – A Homeowners Guide Useful material includes recent sale prices of similar nearby homes that came in lower than your appraised value, photos of condition problems like foundation cracks or roof damage, written repair estimates from contractors, blueprints or a survey if the district’s measurements are wrong, and documentation of negative location factors such as a nearby highway, railroad, or flood zone. Bring copies for yourself, the district representative, and each ARB panelist. Only conditions that existed on or before January 1 count for that year.

What Happens If You Pay Late

Missing January 31 triggers penalties that escalate quickly. A 6 percent penalty hits on February 1, with another 1 percent added each month through June. On July 1, the penalty jumps to 12 percent regardless of how many months you’ve been late.14Texas Comptroller. Penalty Tax Bills Interest runs at 1 percent per month on top of that for every month the tax stays unpaid.

The largest charge usually comes from attorney collection fees. If the taxes are still delinquent on July 1 and the taxing unit has contracted with a collections attorney, an additional penalty of up to 20 percent of the total tax owed can be added. A homeowner who owes $5,000 and ignores the bill into mid-year can face around $600 in base penalties, several hundred more in interest, and a $1,000 attorney fee penalty. Within a single year the total can climb 30 to 40 percent above the original tax.

If delinquency continues long enough, the taxing units can sue to foreclose on the tax lien and force a public sale, typically on the courthouse steps on the first Tuesday of the month. The former owner may have a limited right to redeem the property after the sale, but the redemption price includes all back taxes, penalties, interest, and legal costs. Ignoring a Texas property tax bill is one of the few ways to lose a home outright.

Homeowners who are 65 or older or disabled can defer their taxes entirely, with interest accruing at 5 percent per year and no penalties, as long as the property remains their homestead. The deferred amount comes due when the property is sold or the owner no longer qualifies.