Harris County and Montgomery County Play by Different Rules — And Most Homeowners Don't Know It

The Harris County Appraisal District and the Montgomery County Appraisal District both assess property taxes under Texas Tax Code §41.41, and both use May 15 as the standard protest deadline — or 30 days from the date of your notice, whichever is later. From there, the similarities narrow quickly, and the differences are exactly the kind of detail that determines whether your protest is evaluated on its merits or worked around by process.

This matters because most general guides treat Texas protest rules as uniform. They're not. Each county appraisal district sets its own procedures, operates its own filing portal, constitutes its own Appraisal Review Board, and applies its own informal settlement process. A packet built for HCAD's workflow may not be optimized for MCAD's — and vice versa.

The Filing Portal Is Just the Start

Both HCAD (hcad.org) and MCAD (mcad-tx.org) accept online protests, which puts them ahead of many Texas counties. But the portals work differently, the information they request differs, and — critically — what happens after you file differs substantially.

At HCAD, once you file a protest, you gain access to iSettle: an online settlement tool that lets you submit evidence directly and receive a settlement offer from HCAD's staff appraisers without scheduling a hearing. For homeowners with strong comparable sales data or a documented condition gap, iSettle can resolve a protest in days. It is an HCAD-specific feature — there is no equivalent at Montgomery County Appraisal District.

At MCAD, informal settlements happen over the phone or in person with a staff appraiser. The mechanics are similar — you present your evidence, the appraiser evaluates a reduction — but the process requires scheduling, direct negotiation, and typically more preparation time than HCAD's online tool. Neither approach is inherently better. What matters is knowing which county you're dealing with before you build your evidence package.

ARB Structure and Scale

Both counties convene an Appraisal Review Board — the independent panel that hears protests that don't settle informally. But the ARB's scale and scheduling dynamics differ significantly.

HCAD's ARB is one of the largest in Texas. During protest season (May through July), panels run simultaneously to process Harris County's more than 900,000 residential accounts. That volume means hearing dates are generally available within a reasonable window, but it also means panels are moving quickly. Organized, clearly structured evidence presentations that get to the point are particularly effective in this environment.

MCAD's ARB operates at a smaller scale, reflecting Montgomery County's residential base. Scheduling timelines and panel dynamics will differ — not worse, but calibrated to a different context. Preparation that accounts for those differences produces more credible results than a generic packet designed for no county in particular.

What Evidence Each County Weighs

Both counties operate under Texas Tax Code §41.43, which gives property owners two distinct grounds for protest. The first is value in excess of market value: your assessed value is higher than what your property would sell for under current market conditions. The second is unequal appraisal: your property is assessed at a higher ratio of market value than comparable properties within the same appraisal district — regardless of absolute values.

Both grounds require comparable sales analysis. How you present and weight that evidence should reflect the county you're addressing.

HCAD's mass appraisal model covers more than 900,000 parcels. At that scale, the district relies heavily on neighborhood-level adjustments and sales ratio analysis. Equal and Uniform arguments — showing your assessed value per square foot exceeds comparable properties in the same CAD neighborhood — are well-understood by HCAD staff and ARB panels and are supported directly by data HCAD publishes.

Montgomery County's model covers a smaller, faster-growing county where a mix of new construction and established neighborhoods creates different appraisal dynamics. Comparable sales arguments tend to carry significant weight, particularly when the comparable properties are genuinely similar in age, size, construction quality, and condition — not just proximity.

Why Generic Packets Miss This

A protest packet built without county-specific context makes implicit assumptions that may not hold. It may present evidence in a format the county's staff appraisers don't typically receive, cite comparables that fall outside the county's own neighborhood delineations, or omit the Equal and Uniform analysis entirely — which is available to every Texas property owner under §41.43 but overlooked by most off-the-shelf solutions.

The gap between a county-aware packet and a generic one isn't always visible in the outcome. It shows up in efficiency, credibility, and the likelihood that your evidence gets evaluated on its merits rather than processed past.

How County Rules Get Tracked

FairPath's RuleWatcher monitors published county sources — CAD websites, ARB procedural rules, Texas Comptroller guidance — for changes to filing procedures, evidence requirements, and deadlines. When HCAD updates its iSettle portal or MCAD publishes revised ARB scheduling procedures, RuleWatcher flags the change and updates the county configuration before any new packets are built.

This is not legal interpretation. It's source monitoring — the same thing a competent CPA does when they read the current IRS publication before completing your return rather than relying on last year's version. The county's own published rules drive every packet, not general assumptions about how Texas law works.

The May 15 deadline is the one rule most Harris County and Montgomery County homeowners share. Everything about how you exercise your §41.41 rights after that date is worth checking specifically for your county before you file.

Services like FairPath build protest packets calibrated to your county's specific procedures and evidence formats, for a flat $249 fee. The FairPath property lookup identifies your county and surfaces the applicable filing rules automatically.

FairPath provides document preparation services — not legal advice. For legal questions about your property tax protest, consult a licensed attorney.