Harris County, TX property tax protest guide for 2027

Harris Central Appraisal District (HCAD) values taxable property as of January 1, 2027. If the value, equality of appraisal, exemption treatment, property records, required notices, taxing-unit assignment, or another appraisal-district action is wrong, a property owner may protest to the Appraisal Review Board. Texas appraisal standards describe market value as an open-market price between informed, willing parties without undue pressure, and HCAD is responsible for appraising property rather than setting tax rates or collecting taxes (Texas Comptroller, HCAD first-time owner guide).

2027 Harris County protest deadline

For the 2027 regular protest cycle, HCAD’s published rule is May 15 or 30 days after the notice of appraised value was mailed, whichever is later. If the deadline falls on a weekend or legal holiday, it moves to the next business day. Because May 15, 2027 is a Saturday, the regular county-wide deadline is treated as Monday, May 17, 2027. Accounts with later-mailed notices may have a later account-specific deadline (HCAD FAQs).

Do not wait for the last day if you need time to gather sales, photos, repair estimates, exemption documents, or ownership records. A mailed protest should be postmarked by the account deadline, and online filing should be completed before the deadline for that account.

Filing options

HCAD allows filing through its owner account and iFile system, by mail if postmarked by the account deadline, or in person during office hours. HCAD also describes iFile and iSettle as online tools that let owners protest noticed values and, in many residential cases, submit evidence for review before a formal hearing is set (HCAD iFile and iSettle).

TaxSauce can help estimate value, organize comparable sales, build an equity grid, and prepare a filing packet. The property owner should review the facts, choose the protest reasons, consent to the final packet, and submit it through the filing option they select.

Common protest reasons

Value is over market value

Use Value is over market value when HCAD’s January 1, 2027 market value is higher than comparable arm’s-length sales and other market evidence support. Good evidence often includes a sales grid, sale dates, sale prices, photos, property characteristics, and notes explaining adjustments for differences.

Value is unequal compared with other properties

Use Value is unequal compared with other properties when the property is appraised at a higher level than comparable properties after appropriate adjustments. This can matter even when HCAD’s market value may look supportable. Texas unequal-appraisal evidence focuses on a reasonable number of comparable properties and the adjusted median appraised value or appraisal level.

Other record, exemption, and notice issues

HCAD protest reasons also include Property should not be taxed in this taxing unit, Failure to send required notice, Change in use of land appraised as ag-use, open-space, or timber land, Ag-use, open-space, timber, or other special valuation denied, modified, cancelled, Exemption denied, modified, or cancelled, Owner's name incorrect, Property description incorrect, Property should not be taxed in this appraisal district, and Other.

Use the official reason that matches the dispute. For example, a wrong building area, land size, condition, construction class, or improvement description belongs under Property description incorrect. A denied homestead, over-65, disability, disabled veteran, charitable, religious, or other exemption belongs under Exemption denied, modified, or cancelled.

Comparable-sale evidence for 2027

HCAD does not publish a fixed county-wide numeric grid for residential comparable sales. For a reusable Harris County default, start with arm’s-length sales from calendar year 2026, especially sales closest to the January 1, 2027 valuation date. Prefer the same HCAD market area or neighborhood and within about 1 mile when adequate comparable sales exist. HCAD’s reappraisal materials emphasize market areas, property characteristics, sales data, size, age, condition, location, and related value factors rather than one universal radius or square-footage rule (HCAD 2025-2026 reappraisal plan).

Comparable sales should have the same or similar use and should be adjusted for meaningful differences in gross living area or building area, land size, age, condition, quality or class, location, amenities, restrictions, and other factors affecting value. Exclude, or separately explain, related-party sales, foreclosure or forced-sale transactions, distressed sales, bulk transactions, atypical financing, partial-interest transfers, and other non-market transactions.

For unequal-appraisal evidence, use a reasonable group of comparable properties and compare the subject’s appraised value or appraisal level to the adjusted median of the comparable group. A clear equity grid is usually easier to understand than a list of account numbers without adjustments.

Evidence packet checklist

A strong Harris County protest packet usually includes:

• The HCAD account number and noticed value.
• The selected protest reasons exactly as filed.
• A requested value and a short explanation.
• A sales grid for Value is over market value.
• An equity grid for Value is unequal compared with other properties.
• Sale dates, sale prices, addresses, account numbers, and property characteristics.
• Adjustment notes for size, age, condition, quality, land, location, and amenities.
• Photos, inspection notes, repair estimates, permits, or condition evidence when relevant.
• Exemption, ownership, notice, or record documents for non-value issues.
• Any HCAD data or market data relied on.

HCAD’s affidavit evidence form explains that sworn affidavit evidence may be used when the owner does not attend the hearing, subject to timing and content requirements (HCAD affidavit form 41-44). If you plan to rely on affidavit evidence, read the official instructions carefully before the hearing date.

What happens after filing

Many protests begin with informal review by HCAD. If no agreement is reached, the case can proceed to a formal hearing before the Appraisal Review Board, an independent body. HCAD’s 2024 Annual Report says most panels consist of three ARB members, although a single ARB member can hear a formal protest at the property owner’s request, and the panel makes the final determination (HCAD 2024 Annual Report).

Harris County has very high protest activity. HCAD reported 516,205 protests for 2024, compared with 528,170 in 2023, and listed an average 2024 reduction of 6.98% in its protest activity table. That appeal count and volume context show why organized evidence and clear issue selection matter, but they do not predict any individual result (HCAD 2024 Annual Report).

Tax impact planning

Use 1.72% as a county-wide planning estimate only. The actual tax effect of a value change depends on the overlapping school district, city, county, hospital, flood control, MUD, and other taxing units for the property’s location. HCAD appraises property, but the taxing units set rates and the tax office handles billing and collection (HCAD first-time owner guide).

A lower appraised value does not automatically mean a specific bill reduction. Exemptions, tax-rate changes, homestead caps, and the mix of taxing units can all affect the final tax bill.