Data quality, county by county
We compare the appraisal district's appraised values, not sale prices, so AppealTexasTax is only as good as the data underneath it. For every county, this page shows where the appraisal data came from, how fresh it is, and what it can and can’t support, in plain English. The 2026 protest season is closed. The next one starts with 2027 preliminary notices, usually in April or May. Certified values are final for the year and can't be protested.
- Single-family homes only. We analyze detached single-family homes. Duplexes & multi-family, commercial, land, and business personal property aren’t covered because they’re valued a different way.
- Rural (E-class) homes are shown but not scored. They appear gray, “review by hand” because rural acreage is too varied for reliable automatic comparables.
- How the verdict is made. Each home is compared to similar homes matched on construction quality or class, size, year built, and neighborhood, then checked against the median of those homes.
- Capped, not market. We compare each home’s capped (assessed) value under Tax Code 23.23, not its market value.
“Homes analyzed” is the number of single-family homes that received a verdict (the same count shown on the Counties page). “Years on the map” lists every dataset you can select with the year bar on the map. A certified roll holds the final values for that year. A preliminary roll is the district’s first set of values, before protests lower some of them.
Data source — how the county’s roll is obtained: a free public download, an open-data API, a public FTP, a data portal, or a public-records request. Fee is what it cost to obtain the data. Data as of is the roll’s export date (or our build date). Preliminary rolls are refreshed to the certified values after certification (~August).