The Harris County property tax protest deadline for 2026 is May 15 — or 30 days after your assessment notice is mailed, whichever is later. In Harris County, 88–95% of informal protests backed by documented evidence result in a reduction.
You do not need to hire an attorney or attend a hearing in person.This guide covers every step of the process: checking your assessment, gathering evidence, filing through HCAD's iSettle system, and understanding what happens after you submit.What Is a Property Tax Protest?Every year, the Harris County Appraisal District (HCAD) assigns a market value to your property.
This value determines how much you pay in property taxes. If you believe HCAD's value is too high, Texas law (Tax Code §41.41) gives you the right to formally protest.A protest is not adversarial. It's a standard administrative process that over 400,000 Harris County property owners initiate each year.