Williamson County Property Tax Protest Savings Calculator

See what a lower WCAD value would save, unit by unit, with Williamson County's 2025 rates preloaded.

Short answer: savings = value reduction × your combined rate. In Round Rock (1.678876%), every $10,000 off your value saves about $167.89 a year.

Build your estimate

Rate source

Pick my taxing units

Enter a combined rate I already know

Taxing units

County

City

If you live outside any city limits, choose "Unincorporated / no city."

School district (ISD)

Search special districts

MUDs, ESDs, and similar districts depend on your exact address. None are selected by default — verify yours on your appraisal district's site.

Select a county first.

Property values

Noticed (appraised) value this year ($)

Target value after protest ($)

Support this with comparable sales or an unequal-appraisal comparison — see the prep checklist below.

Do you have a residence homestead exemption on this property?

Yes

Are you age 65+ or disabled?

Yes

Only affects the units-picker mode, where it adds the school homestead exemption automatically.

Per-unit savings
Taxing unit	Rate	Noticed tax	Target tax	Savings

Williamson County example

$400,000 noticed → $360,000 target, homestead, pick Round Rock and Round Rock ISD.

$5,465.16Tax at $400,000
$4,793.61Tax at $360,000
$671.55Yearly savings
1.678876%Combined rate

Appraisal district: Williamson Central Appraisal District (WCAD)
Protest deadline: May 15 (next business day if that falls on a weekend), or 30 days after the notice is mailed — whichever is later (Tax Code §41.44). Check your notice.

Questions

How much could a protest save in Round Rock?

If a $400,000 Round Rock homestead is lowered to $360,000, the bill drops by about $671.55 a year: the $40,000 reduction × the combined 1.678876%.

How do I file a protest with WCAD?

Online through the onlineappeals.wcad.org, using the QuickRef ID and Online Passcode from your current appraisal notice. See wcad.org/online-protest-filing and WCAD's yearly "Protest Process Overview" PDF for paper filing and office details.

What is the Williamson County protest deadline?

May 15 (next business day if that falls on a weekend), or 30 days after the notice is mailed — whichever is later (Tax Code §41.44). Your notice from WCAD shows the exact date.

Do I need to hire a protest company?

No. Filing is free and you can present your own evidence. The free WCAD protest kit walks you through it.