Williamson County Property Tax Protest: Steps and Deadlines
A protest asks the appraisal district to review your home's appraised value. Knowing the deadline and how to file online or by mail keeps you in the process.
A Williamson County property tax protest lets you dispute the appraised value on your home, and it is one of the services the county tax office lists for owners [1]. If you think that value is too high, a protest is how you ask for a review. This article covers the steps, the deadline, and the evidence that helps, so you can decide whether to file. For the next step, see Property Tax in Georgetown TX: How Your Bill Works.
The protest is about the appraised value shown on your Notice of Appraised Value. That value feeds into your home's taxable value, so a lower appraisal can reduce the amount you are taxed on.
The protest must be filed by a deadline tied to that notice, not to when your tax bill arrives. The clock runs from the day the notice is mailed, so note that date as soon as the notice arrives [2].
When is the protest deadline in Williamson County?
Your protest deadline in Williamson County is May 15, or 30 days after the Notice of Appraised Value is mailed, whichever is later. [2] For 2026, the published deadline is May 15, 2026, or 30 days after the notice, whichever is later. [3] In practice, you use whichever of the two dates falls later.
How the two dates compare
Then compare that result with May 15. The later date is your deadline. [2]
Most notices mailed early in the spring leave May 15 as the later date. A notice mailed later in the spring is different. Its 30-day count can run past May 15, and that gives you more time than the calendar date alone suggests. [2]
Here is a concrete case. Suppose your notice was mailed 10 days before May 15. Counting 30 days forward lands 20 days after May 15, so that later date becomes your deadline. Filing on May 15 would have cost you 20 days you were entitled to use. [2]
The rule is the same whether the notice comes early or late. Only the mail date changes the result. A notice mailed a few days earlier moves the 30-day date a few days earlier, and the May 15 date then decides your deadline.
Work from the mail date
The clock runs from the mail date on the notice, so that date is the one to work from. That gives you the full window the rule allows.
If the two dates are close together, pick the later one and file with a few days to spare. A protest filed on the last day leaves no room for a delay in getting it submitted.
Keep both dates in view
You do not need a separate deadline for each year. The same comparison works for any notice you receive, because the rule stays the same from one year to the next. Only the mail date and the calendar year change.
Write the deadline you calculated on the notice itself or in your calendar app, so you can see it at a glance. Once it is recorded, you can plan the filing around it instead of working it out again under time pressure.
How do you file a protest online or by mail?
You can file a Williamson County property value protest online through the Williamson County Appraisal District's protest page, or you can mail it instead. Online filing takes three steps, and mailing is the alternative to them [4].
Filing online
- Open the Property Search box. Go to the Williamson County Appraisal District's online protest filing page. Find the Property Search box at the top of the page, where you search for your property [4].
- Search for your property and click the protest icon. Type your property information into the Property Search box and locate your home. If the search returns more than one result, choose the one that matches the address on your notice. Then click the icon for filing a protest online, which is the option for protesting instead of mailing a protest [4].
- Complete the protest online. Follow the form that opens and enter the details as they appear on your Notice of Appraised Value, so the form matches your property record. For example, if your notice shows a unit number, include it in the same format.
Mailing instead
If you prefer not to file online, you can mail the protest instead of using the online form [4].
Keep a copy of everything you send, along with the date you mailed it. That copy shows what you submitted and when, which helps if the district later asks about your filing.
Choosing between online and mail
Filing online starts from the property search, so you do not have to hunt for the right form. Mailing suits you if you prefer to write your reasons in your own words or include supporting papers with the protest. Either way, plan to send it early so it reaches the district on time.
Once you submit, the protest is on record with the district. Keep the confirmation or your mailed copy with your notice, so you can match them if anything comes back later.
What mistakes cause a protest to miss out?
The protest window is set by the appraisal notice, not by your tax bill. If you wait for the bill, you may find the deadline has already passed, because the clock is tied to when the Notice of Appraised Value was mailed [2].
Waiting for the tax bill
The tax bill arrives later and does not start the protest period. Owners who hold off until the bill shows up often run out of time. Look for the appraisal notice itself, since that is the document the deadline depends on [2].
Counting from the day you opened the notice
Many owners count from the day they opened the envelope or first saw the value. The deadline counts from the day the notice was mailed, not the day you read it [2]. For example, if the notice was mailed on a Tuesday and you opened it the following Monday, the clock started on Tuesday.
This is easy to get wrong when mail sits in a box for a few days. Write the mailing date on the notice as soon as you get it, so you are not guessing later.
Assuming a late mailing will be accepted
Mailing your protest close to the deadline is a risky plan. Do not assume that a letter dropped in the mail on the last day will count as on time. Treat the deadline as the last day your protest can be filed, and file well before it.
File early
Set a reminder for at least one week before the deadline and file that week. If you mail the protest, allow time for delivery. If you file online through the Williamson County Appraisal District, you can finish the job in one sitting rather than waiting on the post office.
Keep a copy of whatever you submit. If the appraisal district questions your filing later, you will have proof of what you sent and when.
Next step: check your notice and calendar the deadline
Your protest deadline is May 15 or 30 days after your Notice of Appraised Value is mailed, whichever is later [2].
Start by finding the notice and noting its mail date, because the 30-day count begins there. Then calendar both May 15 and the date 30 days after the mail date, and treat the later one as your deadline [2]. Set a reminder a few days early so a slow mail date does not catch you short.
To file online, search for your property in the Property Search box on the Williamson County Appraisal District site and click the icon for filing a protest online [4]. If you prefer, you can mail the protest instead [4]. Either way, file before your calendared date. For the next step, see Williamson County Property Tax Due Date: Installments and Deadlines.