Texas property tax protest deadline is May 15 for most counties

By AI, Created 5:06 PM UTC, May 18, 2026, /AGP/ – Texas property owners have until May 15, 2026, to file most property tax protests, with some counties using later deadlines tied to notice dates. The filing window matters because appeals can correct appraisal errors and potentially reduce taxable values before tax bills are finalized.

Why it matters: - Texas property taxes are among the highest in the nation, and rising values in 2026 could push bills higher when the next round is released. - Property tax protests can reduce a home or business’s taxable value, which can lower taxes. - The protest process can also correct appraisal mistakes that may affect owners for years. - Missing the deadline usually means losing the chance to challenge the appraisal for that year.

What happened: - The standard statewide deadline to file a Texas property tax protest is May 15, 2026, or 30 days after the notice of appraised value was mailed, whichever is later. - Harris County moved its deadline to May 18. - Most Texas counties are still using the May 15 deadline. - O’Connor highlighted the deadline and urged property owners to act quickly.

The details: - The appeal deadline applies to the informal protest filed with the appraisal district. - Most protests are resolved at the informal level through a settlement. - If the appraisal district does not offer an acceptable settlement, the taxpayer can move to the appraisal review board, or ARB. - If needed, the taxpayer can go further into binding arbitration or judicial appeals. - Filing can be done electronically through the appraisal district portal or by submitting Form 50-132. - Taxpayers should gather supporting documents and attend the appraisal district meeting to present evidence. - Late appraisal notices can extend the filing window beyond May 15. - The deadline on the notice itself may show the correct filing date. - Taxpayers can also check their appraisal district online for their individual deadline. - Valid grounds for a protest include factual errors, overappraisal, and unequal appraisal. - Factual errors can include incorrect ownership, missing exemptions, wrong square footage, incorrect classification, or nonexistent improvements. - Overappraisal means the property was assessed above reasonable market value. - Unequal appraisal means the property was assessed higher than similar neighboring properties. - Evidence can include photos, repair estimates, comparable sales, and appraisals of nearby properties.

Between the lines: - The biggest risk is not just a higher bill, but a missed chance to fix appraisal records before those errors compound. - Texas growth is expanding demand beyond the biggest metros into cities such as Waco, Killeen, and surrounding suburbs, which can keep upward pressure on values. - A late notice can matter as much as the county deadline, so owners need to check their own appraisal notice instead of assuming May 15 applies.

What’s next: - Property owners still have a short window to file before the deadline closes. - Owners who want help can enroll in O’Connor’s Property Tax Protection Program, which has no upfront fee and charges only if the firm reduces taxes. - O’Connor says online enrollment takes 2 to 3 minutes. - The firm represents 185,000 clients in 49 states and Canada and handled about 295,000 protests in 2024.