How to Tell If Your County Overvalued Your Home (And What It Actually Takes to Fight a Bad Number)
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My neighbor's county assessment jumped 31% in one year while her house sat unsold and unpainted. Mine barely moved. Same street. Same school district. Different luck with whoever ran the numbers that cycle. That gap is the entire reason this topic exists, and it's the reason you should spend ten minutes checking your own notice instead of assuming it's fine.
I've watched enough of these notices land in mailboxes to know the pattern: a county appraiser works from a mass model, your house gets slotted into a value bucket, and nobody walks your driveway before the number goes out. Sometimes the bucket fits. Sometimes it doesn't. If it doesn't, a travis county property tax appeal is the standard way homeowners push back, and the same basic mechanics show up in most counties, not just Travis. Your job today isn't to become a tax expert. It's to figure out whether your number is wrong enough to bother with, then do the boring parts right if it is.
Here's what we're covering: how to read your notice in five minutes, the three mistakes that sink most challenges, a filing calendar that keeps you out of trouble, and the evidence that actually moves an appraiser. No jargon, no fee schedule, no promise that you'll win.
Read Your Notice Like You're Looking for Errors, Not Numbers
Most people open the envelope, look at the total, feel something, and put it down. That's backwards. The total is downstream of two inputs: the taxable value and the rate. The rate gets set by your school district, city, and county in public meetings you can attend but can't really fight. The value is the part you can contest, so that's where your attention goes.
Skim for four things:
The assessed value versus last year's assessed value, as a percentage.
The exemptions listed. If you filed a homestead exemption and it's missing, that's a phone call, not a protest.
The value classification. Did they call your 1,800 square foot ranch a two-story?
The deadline printed somewhere on the page. It's usually within a month of the notice date.
If the percentage jump is bigger than what's happening to similar homes around you, keep going. If it's roughly in line with the neighborhood and the exemptions are right, you probably don't have a case, and filing one anyway costs you a Saturday and a little credibility with the panel.
What Actually Constitutes Overvaluation
Feeling like your taxes are too high and proving your house is overvalued are two different animals. The board doesn't care that the bill stings. It cares whether the number on your notice reflects what your property would realistically sell for on January 1.
So grab comparable sales. Not listings, not Zillow's estimate. Closed sales, ideally within the last year, ideally within a half mile, ideally similar in age, size, and condition. Three solid comps beat fifteen loose ones, and a comp that sold for a stretch price after a bidding war hurts you more than it helps.
Then look for defects the mass model couldn't see. Foundation repair. A weird lot shape. A busy road at the property line. An addition that never got permitted, which cuts value no matter how much you spent on it. This is the part where a little honesty pays off, because the panel hears "my house is perfect and worth less" all day and tunes it out.
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The Filing Calendar You Can't Afford to Miss
Every jurisdiction sets its own window, but the shape is consistent: you get a notice, you get a fixed stretch of time to respond, and once that stretch closes, you're usually stuck with the number for the year. In Texas, the standard deadline is May 15 or 30 days after the notice arrives, whichever comes later, and that detail trips people up every spring.
Put the deadline in your phone the day the notice lands. Not the day you decide to protest. The day it lands. I've seen people with a genuinely strong case lose it entirely because they spent three weeks hunting down a survey and blew past the window.
Filing itself is usually a form or an online portal, and it's free in most counties. You don't need a lawyer to file. You need a settled number in your head, your comps, and photos of whatever's wrong with the place.
Where Most Challenges Fall Apart
Arguing the tax bill instead of the value. The panel can't lower your rate. Ask for a value correction and let the bill follow.
Showing up with an estimate. Automated valuation models are all over the place, and appraisers know it. The Federal Trade Commission has written about how those estimates get marketed, and the short version is they're not appraisals. Printed listings from a portal carry about the same weight.
Ignoring the evidence packet requirement. Many counties want documents submitted before the hearing, not handed across the table. Read the instructions twice. It's tedious and it decides cases.
A Quick Way to Check Your Own Odds Before You Bother
I call it the two-question screen, and it takes about five minutes.
Question one: can you name three closed sales nearby that support a lower number? If you can't name them without opening a laptop, your case is thin.
Question two: is there something about your property the county's model couldn't have known? A defect, a lot issue, a use restriction? If yes, you've got an argument that doesn't depend on market timing.
Two yeses, file. One yes, file if the gap is wide. Zero yeses, save your afternoon. That screen has kept me from wasting more time than any spreadsheet ever did.
For context on why local governments lean on this revenue source so hard, the U.S. Census Bureau tracks how property taxes stack up against other local revenue streams, and it's not a small slice. Knowing that doesn't change your number, but it explains why counties are slow to hand out reductions without documentation.
Evidence Type | Weight With the Panel | Effort to Gather
|
Closed comparable sales | High | Medium |
Photos of defects | High | Low |
Contractor repair estimate | Medium | Low |
Online valuation estimate | Low | Very low |
Recent listing prices | Low | Low |
If You'd Rather Not Do It Yourself
Filing on your own is genuinely doable, and I'd push most homeowners to try it once just to learn how the system reads their property. But there's a version of this where hiring help makes sense: a wide valuation gap, a commercial property, a hearing already rescheduled twice, or a schedule that won't allow a weekday morning off. Look for a firm that charges based on what it saves you rather than a flat retainer, because that structure keeps their incentives pointed the same direction as yours.
One more thing worth checking before you file anything: your state's rules on how values get set and what relief programs exist, since those vary more than most people assume. The Texas Comptroller's office publishes plain-language material on how the process works in this state, and reading twenty minutes of it will make your hearing go smoother than any script you memorize.
What to Do This Week
Pull your notice out of the pile. Check the four items. Run the two-question screen. If the answer is file, calendar the deadline, gather your comps, and submit early rather than the night before. If the answer is skip, you've still learned how your county values your biggest asset, and that knowledge pays off the next time a notice shows up. So, what's the gap on your notice this year, and does it match what homes near you are actually selling for?