The 2026 Collin County Protest Deadline Is Almost Here
If you own property in Collin County — Plano, Frisco, McKinney, Allen, Prosper, Wylie, or anywhere else in the county — and you think your appraised value is too high, Texas law gives you the right to protest. But that right expires on a fixed date. Miss it, and you're stuck with whatever the Collin Central Appraisal District (CCAD) has decided your home is worth — and the tax bill that comes with it.
Here's what Collin County homeowners need to know about the 2026 protest deadline.
The Standard Deadline: May 15, 2026
For most Collin County homeowners, the deadline to file a property tax protest is May 15, 2026. This is set by Texas state law and applies to residential properties across the state.
Your protest must be received by CCAD on or before this date — not postmarked. If you're filing by mail, send it well in advance. Better yet, file online through CCAD's Taxpayer Portal at onlineportal.collincad.org to avoid mail delays entirely.
The 30-Day Rule: Your Safety Net
There's one important exception under Texas Tax Code Section 41.44(a)(1). If CCAD mails your appraisal notice after April 15, 2026, you get 30 days from the date on the notice to file your protest — even if that date falls after May 15.
How it works in practice:
- Notice dated April 10, 2026 → deadline is May 15, 2026 (standard deadline)
- Notice dated April 22, 2026 → deadline is May 22, 2026 (30 days from the notice)
- Notice dated May 3, 2026 → deadline is June 2, 2026 (30 days from the notice)
Always check the date on your appraisal notice. The 30-day rule can give you extra time, but only if your notice was mailed late. Don't assume — verify.
What Happens If You Miss the Deadline?
If you miss the deadline, CCAD will not accept your protest. There are no extensions, no grace periods, no appeals. Your appraised value for 2026 becomes final, and your tax bill will be calculated based on that number.
Collin County's combined tax rate runs around 2.1-2.2% depending on your city and school district. With Collin County's higher-than-average home values, a $50,000 over-assessment can cost you more than $1,000 in unnecessary property taxes for the year. A $80,000 over-assessment costs over $1,700. In high-growth areas like Frisco and Prosper, where assessments often outpace actual market reality, the gap can be even larger.
How to File Your Protest With CCAD
Filing is simpler than most people think. You don't need a lawyer, and the filing itself is free. Collin County homeowners have three options:
Option 1: File Online Through the Taxpayer Portal (Recommended)
CCAD's online system, the Taxpayer Portal, is the fastest way to file. Visit onlineportal.collincad.org, create an account if you don't already have one, link your property, and follow the protest prompts. You'll need your property account number (it's on your appraisal notice).
Benefits of filing online: - Instant confirmation that your protest was received - Many protests are settled entirely through the portal — no in-person hearing required - You can upload evidence directly through the portal
Option 2: File by Mail
Download the protest form from collincad.org or use the one included with your appraisal notice. Fill it out, sign it, and mail it to the address listed on the form.
Important: Mail it at least 7-10 days before the deadline. Consider sending it via certified mail so you have proof of delivery.
Option 3: File in Person
You can bring your completed protest form directly to the CCAD office in McKinney. This guarantees delivery but requires a trip and possible wait time.
What to Include When You File
The filing itself is straightforward. You need to:
- Identify your property (account number or address)
- State the reason for your protest (most homeowners choose "value is over market value")
- Sign and date the form
You do not need to include your evidence when you file. Evidence — comparable sales, photos, property record corrections — comes later, either through the Taxpayer Portal or at your hearing. The filing just gets you in the door.
That said, start gathering evidence right away so you're not scrambling later.
A Simple 2026 Timeline for Collin County
- Early April: Receive your appraisal notice from CCAD. Review it immediately.
- Mid-April: Decide whether to protest. Look up comparable sales and check your property record for errors.
- Late April: File your protest through the Taxpayer Portal. Don't wait until the last minute.
- May – July: Settle through the portal, or attend your informal hearing and/or ARB hearing.
- After decision: If successful, your appraised value drops and so does your tax bill.
Why Filing Early Beats Filing Late
Collin County is one of the fastest-growing counties in the country, and CCAD processes well over 150,000 protests each year. Filing early in April or early May gives you real advantages:
- No risk of missing the deadline due to illness, travel, or forgetfulness
- Earlier hearing dates — CCAD schedules in the order protests are received
- More time to gather evidence and build a strong case
- Settlement opportunities — the Taxpayer Portal often resolves early filers with a reasonable reduction without any hearing at all
In a county where suburbs like Frisco, Prosper, and Celina are still adding thousands of new homes per year, mass-appraisal models routinely lag the true market — which means well-supported protests have a strong chance of success.
Get Your Free Collin County Analysis
Not sure whether your home is over-assessed? You can find out in under a minute.
Enter your Collin County address at claimengine.org for a free, instant property analysis. We pull comparable sales data, check for over-assessment, and show you an estimate of potential savings. If there's a case to be made, we prepare everything you need to file a successful protest — before the deadline passes.
Related Guides
- Texas Property Tax Appeal: Statewide Guide
- How Comparable Sales Can Lower Your Property Tax Bill
- Common Property Tax Appraisal Errors to Watch For
- Free Collin County Property Tax Analysis — Don't miss the deadline