Harris County Property Tax Protest Deadline 2027

The date to remember: May 15, 2027. Here's the deadline, the fine print around it, and exactly what to do the day your HCAD notice lands in the mail.

The deadline: May 15, 2027

The deadline to protest your Harris County property taxes for the 2027 tax year is May 15, 2027. That is the date your protest must be filed — not postmarked, not prepared, filed. HCAD's online system timestamps your submission, and that timestamp is what counts.

There is one legal nuance: Texas law gives you until May 15 or 30 days after the date of your Notice of Appraised Value, whichever is later. Because HCAD mails its notices around April — and most homeowners receive them before mid-April — May 15 is the date that applies to the vast majority of properties. If your notice is dated unusually late (or you never received one and can show it), the 30-day window could be the one that applies to you. When in doubt, use the earlier of the two — May 15 — and you cannot miss either way.

We keep this page year-free in the URL but update it every year, so "deadline 2027" search results always land on the current date. For the full how-to — what triggers a protest, what evidence wins, the hearing process — see our complete how to protest your Harris County property taxes guide.

When HCAD mails the notices

HCAD sends Notices of Appraised Value each year around April. The notice shows HCAD's proposed appraised value for the coming tax year, last year's value, and the change between them. It is the official starting gun for protest season: from the day notices go out, you have the deadline window above to decide whether to file.

You don't have to wait for the paper notice to start. Your HCAD record is public, and our free check pulls the same values from HCAD's official bulk records — market, appraised, and taxable — for any address, any time of year. If you're fairly sure you want to protest, knowing your numbers weeks before the notice arrives is a real advantage.

The 30-days-after-notice rule, explained

The "whichever is later" rule exists to protect homeowners who get their notice late. If your notice is dated April 25, for example, 30 days after that is May 25 — which would be your deadline under the rule. If your notice is dated April 10, 30 days after is May 10, and May 15 is later — so May 15 wins.

The practical reading: the deadline is May 15 for nearly everyone, and the 30-day rule only extends it when the notice arrives late enough to push the 30-day mark past May 15. Do not rely on the extension. Treat May 15 as the date and you are covered in every scenario.

What happens if you miss it

The protest window is set by Texas law, and HCAD is not permitted to simply accept protests filed whenever homeowners get around to it. A protest filed after the deadline is generally not accepted, and the appraised value stands for that tax year.

We are not going to invent clever remedies for you, because there aren't reliable ones. Missing the deadline means your best lever — the annual protest — is closed until the next protest season. The honest takeaway is unglamorous: check your values early, decide early, and file early. A 15-minute online filing on May 1 beats a stressful scramble on May 16.

One common confusion worth clearing up: the May 15 protest deadline is about challenging the appraised value. It is not the deadline to pay your tax bill — bills are mailed later in the year, after rates are set, and come with their own due dates. Don't let "I'll deal with it when the bill comes" become the reason you miss the protest window. The bill arrives months after the chance to protest is gone.

How to file online: HCAD iFile

Filing is straightforward through HCAD iFile, the appraisal district's online portal at owners.hcad.org:

1. Create an account or log in (you'll need your property address and, if you have it, your HCAD account number — find both on your notice).
2. Start a new protest for your property and select your grounds — the most common is that the appraised value exceeds market value.
3. Upload your evidence (comparable sales) and submit. The system confirms your filing date — keep that confirmation.
4. Watch for next steps: an informal hearing offer, a hearing scheduling notice, or a decision.

Mailed and in-person filings are still accepted, but online is faster, gives you an immediate record, and eliminates any question about whether HCAD received your protest in time.

One practical tip: don't wait to create your iFile account. Account setup takes a few minutes, and doing it before the notice even arrives means the only thing left on deadline day is the filing itself. Small prep now removes the entire class of "the system was slow and I missed it" failure.

What to do the day the notice arrives

The notice is not a bill and not a demand — it's a proposal. Here is a calm, sensible sequence:

1. Don't panic. An increased appraised value does not mean your tax bill increased by that percentage — exemptions, the cap, and rate changes all sit between the two numbers.
2. Check your values free. Run your address through our check to see the market, appraised, and taxable values side by side, plus your exemptions and cap status.
3. Gather comps if there's a case. Three or more recent, deed-verified sales of similar nearby homes. If you can't find three, the honest conclusion may be not to protest.
4. Decide and file before May 15, 2027. Filing costs nothing and commits you to nothing — you can still walk away after hearing HCAD's informal offer.

The single best day to start is the day the notice arrives. Every deadline crisis in April and May traces back to someone putting the notice aside for "later."

Why the deadline gets real urgency — and why that's legitimate

A lot of tax-adjacent marketing manufactures urgency that doesn't exist. This deadline is different: it is a real, statutory date, and missing it genuinely closes the door for the year. That is why this page exists and why it is worth acting on now rather than in May.

At the same time, "urgent" does not mean "file blindly." Filing a protest you can't support is wasted effort — the ARB will not lower a defensible value just because you asked. The right move is the two-step: check your numbers first, and only file if there's an evidence-backed case. That's the honest framing we build everything around: the deadline is real, but so is the possibility that the right answer is not to appeal.

Same-day help if you have a case

If your free check suggests an appeal is worth pursuing, our $59 Detailed Appeal Analysis builds the evidence side for you: deed-verified comparable sales, a human review of every comp, a signed market-value range, estimated savings, and a PDF you can take to the hearing. Same-day delivery — order by noon and the report arrives today. It is the fastest way to go from "my notice says what?" to a filed, evidence-backed protest before May 15, 2027.

Frequently asked questions

Educational information about Texas and Harris County property tax protests. Not legal, tax, or appraisal advice. Savings figures are estimates, not guarantees. Verify deadlines and procedures with HCAD (hcad.org) before acting.

Last updated: August 15, 2026