How Much Does a Property Tax Protest Save? Real Data from 960,000 Texas Homes

Everyone asks the same question before they protest their property taxes: is it even worth the effort? To answer it with data instead of anecdotes, we ran millions of homes through the same comparable-sales method our live calculator uses. The results are blunt. Across the properties we analyzed, hundreds of thousands are over-assessed, and the combined annual overpayment runs into the billions. Here is what the numbers actually say, and what a protest is realistically worth for a typical homeowner.

The headline numbers

Our over-assessment study analyzed 8.2 million homes across five states, matched each one against comparable nearby properties, and flagged those assessed above what their comps support. The totals:

• 978,080 homes came back over-assessed.
• Those homes carry roughly $4.44 billion in combined annual over-assessment.
• Texas alone accounts for the largest share: of about 2.42 million Texas homes analyzed, 768,351 are over-assessed, an estimated $3.57 billion in annual overpayment.

In other words, nearly one in three analyzed Texas homes is carrying a value above what comparable properties nearby actually support. That is not a rounding error. That is a systemic pattern in how mass appraisal works, and it is exactly what the protest process exists to correct.

What a protest is actually worth per home

Aggregate billions are abstract. What matters to you is the per-home number. A successful residential protest in Texas typically produces on the order of $760 in annual tax savings, in line with the roughly $774 average that contingency services themselves report.

The reason that number matters more than it looks: it repeats. When you win a reduction, the lower assessed value becomes the baseline your future assessments build on. A single successful protest of around $760 a year is $3,800 over five years, and the homestead cap math means the benefit tends to persist rather than reset.

Set against that, the cost of protesting is small. Filing yourself is free. A flat-fee kit is $49, one time. The expected value of a protest, for an over-assessed home, is strongly positive.

County-by-county: Texas

Over-assessment is not evenly spread. Running each county's homes through the same matched-comps method the calculator uses on the live site, here is what the five big metros look like. The rates below are normalized to be comparable across counties.

A few things stand out:

• Bexar County / San Antonio has the highest normalized over-assessment rate of the major metros at 23.6%. Older inner-city ZIP codes like 78207, 78210, 78201, and 78204 are among the most over-assessed in the county. Full detail is in our Bexar County guide.
• Travis County / Austin sits at 19.9%, and because the Austin market cooled from its 2022 peak while assessments lagged, many of those gaps are unusually wide. See the Travis County guide.
• Tarrant County / Fort Worth is at 21.4% on a normalized basis. More in the Tarrant County guide.
• Harris County / Houston produces the largest raw count of over-assessed homes in the state simply because it is the biggest metro, at a 2.31% effective rate, the highest of the five. See the Harris County guide.
• Dallas County carries an elevated over-assessment rate consistent with its peer metros. We report normalized per-home counts where our method produces them; the Dallas County guide has the current filing detail.

At these tax rates, even a modest reduction is real money. A $30,000 cut in assessed value at Harris County's 2.31% rate is about $693 a year, every year you hold the lower value.

Why so many homes end up over-assessed

Appraisal districts use mass appraisal: they group your home with neighborhood comps, apply a per-square-foot value from recent sales, and adjust for characteristics. The model is calibrated to the median, which means individual homes with any negative attribute, a smaller lot, dated condition, a less desirable street, a flood-zone location, routinely end up valued too high. The model also cannot see inside your house, so foundation problems, roof damage, and deferred maintenance never make it into the number.

That is why the unequal-appraisal argument wins so often. You do not have to prove the whole system is broken. You just have to show that comparable homes near you are assessed for less, which the district's own public records frequently confirm.

How to find out where you stand

The study answers the population-level question. For your specific home, the answer takes about 30 seconds:

1. Run your address in the free calculator. No signup. It pulls your comps from public county records and estimates your over-assessment and annual savings.
2. If you are over-assessed, you have a case worth filing. Do it yourself for free, or use the $49 flat kit to skip the comp-pulling and get a filing-ready packet, keeping 100% of the savings.
3. If you are fairly assessed, you found that out for free and can stop.

Read the full methodology and the most over-assessed ZIP codes in our nationwide over-assessment study, or the Texas study hub for the county-by-county picture.

The data is clear: hundreds of thousands of Texas homeowners are overpaying, the typical fix is worth around $760 a year, and it compounds. The only homeowners who never see that money are the ones who never check. Check your property and find out which group you are in.

Check Your Houston Address

Free calculator pulls HCAD comps in 30 seconds, no signup. Optional $49 protest kit pre-fills your iFile protest, so you just sign and submit, and you keep 100% of your savings.