What is a property tax appeal?

A property tax appeal (also called a protest in Texas) is a formal process where you challenge your county appraiser's assessed value of your home. You file with the county Appraisal Review Board (ARB), present comparable-sales evidence that your home is overvalued, and the board issues a ruling.

When is the Texas property tax appeal deadline?

In Texas, the deadline to file a property tax protest is May 15 each year (or 30 days after your appraisal notice is mailed, whichever is later). The 2026 deadline has passed; the next protest window is April-May 2027.

How much can I save by appealing my property taxes?

Homeowners who appeal save an average of $774 per year in Texas, and you can protest again every year. Success rates range from 80-91% when you bring 3-5 comparable sales as evidence.

What's the difference between AppealMyTax and Ownwell?

AppealMyTax charges a flat $99, one time, for a complete personalized appeal packet you file yourself, or $199-$249 for our done-for-you filing service. You keep 100% of your savings every year. Ownwell keeps a 25-35% contingency on whatever you save and O'Connor keeps about half, meaning a $2,461 reduction costs you roughly $615-$1,230 every year forever. We charge $99 once and keep nothing.

What percent of homes in ZIP 75166 are overassessed?

19.7% of homes in Houston ZIP 75166 (1,151 of 5,846 parcels) are assessed more than 10% above the typical per-square-foot value for the neighborhood, based on HCAD public records.

How do I protest my property taxes in Houston ZIP 75166?

File a Notice of Protest with Collin CAD by May 15 each year. Bring 3-5 comparable sales from your immediate area to your ARB hearing. 2026 deadline has passed — next protest window is April-May 2027.

Collin County · Houston

ZIP 75166 property tax overassessment report

19.7% of homes in Houston ZIP 75166 (1,151 of 5,846 parcels) are assessed more than 10% above what comparable-size homes in the same ZIP typically pay per square foot. Combined annual overpayment: $1,625,076.

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5,846

Homes in ZIP

1,151

Flagged as overassessed

19.7%

$65,668

Avg overage / home

$336,244

Typical value

~$151/sqft

Collin County · over-assessed homes overpay year-round

Next: Collin CAD 2027 values mail late March-April. Protest deadline: May 15, 2027.

Collin County guide →

Top 25 most overassessed homes in 75166

Addresses anonymized. Pulled directly from HCAD public records. Each home pays significantly more than what a comparable-size home in this ZIP typically pays.

Address	Sq ft	Year	Market val	Expected	Overage	% over	$/yr
1XXXX STATE HWY 205	1,200	1970	$2,253,639	$181,200	$2,072,439	1143.7%	$42,278
1XXXX COUNTY ROAD 483	3,340	1983	$2,506,563	$504,340	$2,002,223	397%	$40,845
1XXXX STATE HWY 205	2,790	1985	$2,071,992	$421,290	$1,650,702	391.8%	$33,674
9XXX COUNTY ROAD 483	2,430	1986	$1,638,068	$366,930	$1,271,138	346.4%	$25,931
MCCLENDON RD	619	1940	$1,205,543	$93,469	$1,112,074	1189.8%	$22,686
1XXXX STATE HWY 205	9,695	2009	$2,447,000	$1,463,945	$983,055	67.2%	$20,054
1XXXX COUNTY ROAD 483	3,966	2021	$1,434,081	$598,866	$835,215	139.5%	$17,038
1XX MCCLENDON RD	2,734	1998	$1,224,129	$412,834	$811,295	196.5%	$16,550
1XXXX COUNTY ROAD 535	6,379	2023	$1,760,648	$963,229	$797,419	82.8%	$16,267
1XXXX STATE HWY 205	3,430	1997	$1,285,023	$517,930	$767,093	148.1%	$15,649
1XXXX CADDO CREEK DR	3,398	2009	$1,271,909	$513,098	$758,811	147.9%	$15,480
1XXX LAKE RD	5,099	2015	$1,506,661	$769,949	$736,712	95.7%	$15,029
1XXXX COUNTY ROAD 746	2,032	1984	$994,063	$306,832	$687,231	224%	$14,020
1XXXX COUNTY ROAD 535	3,874	2023	$1,242,798	$584,974	$657,824	112.5%	$13,420
1XXXX COUNTY ROAD 483	2,960	1996	$1,089,315	$446,960	$642,355	143.7%	$13,104
1XXXX CADDO CREEK DR	4,475	2006	$1,262,905	$675,725	$587,180	86.9%	$11,978
1XXXX COUNTY ROAD 945	4,148	2021	$1,193,898	$626,348	$567,550	90.6%	$11,578
1XXX GAGE RD	2,884	2014	$1,002,539	$435,484	$567,055	130.2%	$11,568
1XXXX CADDO CREEK DR	4,010	2007	$1,158,571	$605,510	$553,061	91.3%	$11,282
1XXXX STATE HWY 205	800	1990	$669,611	$120,800	$548,811	454.3%	$11,196
1XXXX COUNTY ROAD 483	2,172	1996	$876,735	$327,972	$548,763	167.3%	$11,195
9XXX SUNSET DR	3,744	2016	$1,105,386	$565,344	$540,042	95.5%	$11,017
9XX LAKERIDGE DR	4,567	2017	$1,229,005	$689,617	$539,388	78.2%	$11,004
1XXXX COUNTY ROAD 483	1,908	1976	$802,512	$288,108	$514,404	178.5%	$10,494
1XXXX COUNTY ROAD 483	3,155	2019	$968,073	$476,405	$491,668	103.2%	$10,030

Data: HCAD public records, Collin County, ZIP 75166. Addresses anonymized to protect privacy; full data is public record under Texas Public Information Act. Showing top 25 — there are likely more overassessed homes in this ZIP.

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