Collin County Property Tax Protest: How to Do It Yourself
If your Collin Central Appraisal District/CCAD notice shows a value that feels too high, you can protest it — free, on your own, without paying a company a cut of your savings. The process runs through CCAD and an independent Appraisal Review Board/ARB, and most homeowners can work through it start to finish in a few hours. This guide covers exactly what to do in Collin County.
Who Sets Your Value: CCAD and the ARB
The Collin Central Appraisal District appraises every property in Collin County for tax purposes. CCAD does not collect taxes — it sets the assessed value that cities, school districts, and other taxing units use to calculate your bill. When you protest, you are challenging CCAD's number before the Appraisal Review Board, an independent panel that is not part of CCAD. The ARB weighs your evidence against CCAD's and decides.
The Protest Deadline — Confirm It Before Anything Else
Texas law generally gives homeowners until May 15 or 30 days after CCAD mailed your Notice of Appraised Value — whichever is later. Miss that window and you lose the right to protest for the current year; there is no grace period. Check the exact current deadline at collincad.org as soon as your notice arrives. Do not rely on a prior year's date — deadlines are year-specific.
Two Grounds Worth Filing On
A protest has to rest on a stated legal ground. Two cover the vast majority of successful residential protests in Collin County, and you can check both on the same form at no extra cost.
- Market value: CCAD's appraised value exceeds what your home would realistically sell for today. You back this up with recent comparable sales — similar homes nearby that closed for less than CCAD's figure.
- Unequal appraisal (equity): your home is assessed at a higher ratio to market value than comparable properties nearby. In Texas the equal-and-uniform argument stands on its own and can produce a reduction by itself.
Most Collin County homeowners file on both grounds simultaneously. CCAD's online portal lets you view the comparables CCAD used when setting your value, which can reveal inconsistencies before you submit.
How to File Your Protest With CCAD
CCAD accepts protests online through its e-file portal at collincad.org, by mail using Form 50-132 (Notice of Protest), and in person at the CCAD office in McKinney. Online is fastest and gives you a timestamped confirmation — keep it. State your grounds (market value, unequal appraisal, or both) when you file. Nothing has to be attached at filing — the evidence comes with you to the hearing.
After filing, CCAD may send an informal settlement offer before your ARB date — many protests resolve here without a formal hearing. If you reject the offer, your case moves to a formal ARB hearing (typically 15–30 minutes) where both sides present evidence.
Collin County by the Numbers: What CCAD Values and What the County Charges
These are the Comptroller's official numbers for the county — 2025 County Report of Property Value, data version January 28, 2026 — and they show the scale the appraisal district operates at.
| Measure | Collin County | What it means |
|---|---|---|
| Total market value | $336.3 billion | The district's full valuation of county property, exemptions not yet deducted. |
| Taxable value (General / Road & Bridge) | $270.5 billion | The base the county actually taxes after exemptions. |
| County tax rate, 2025 | $0.14934 per $100 | County portion alone; your bill adds school, city and special-district rates on top of it. |
| County levy | $0.404 billion | What that rate yields for the county across all accounts. |
What this means for your bill. On $300,000 of taxable value the county line alone runs about $448 a year ($300,000 ÷ 100 × $0.14934). Take 10% off the appraised value and that line drops by roughly $45 — and the identical reduction then applies to every other rate charged on the same value, which is where the bulk of any saving comes from. Collin has the lowest county rate in this group — but one of the fastest-rising tax bases, so values move quickly year over year. Your own rates appear on your tax bill.
Evidence That Moves the ARB
Everything you plan to rely on should be printed and handed over in hard copy. Collin County's rapid growth in cities like Frisco, McKinney, and Prosper means CCAD's mass-appraisal models can miss property-specific details that hurt your value.
- Three to five comparable sales from the past 12 months: similar square footage, lot size, age, and condition, in your subdivision or close to it, that sold below CCAD's appraised value.
- Appraised value per square foot for neighboring properties pulled from CCAD's public records — showing yours is higher — to support an unequal-appraisal argument.
- Photos or repair estimates documenting condition problems CCAD may not have on file: foundation movement, roof damage, drainage issues, or outdated systems.
- A recent independent appraisal from a refinance or purchase — it carries real weight with the ARB panel as a licensed professional's opinion of value.
Close, well-matched comparable sales remain the surest route to a reduction. A reduction is not guaranteed — it depends on how your evidence lines up with CCAD's data and the ARB's judgment.
Questions Collin County Homeowners Ask
Do I have to appear before the ARB?
Frequently no — CCAD tends to make an informal offer first, which settles a large share of cases. Decline and a short formal hearing follows.
DIY or agent?
For a typical single-family home with solid comps, DIY gets you there. Bring in help for complex properties or when you simply have no time for the hearing.
Do I send evidence with the filing?
No. At filing you state grounds only. Comps, photos and estimates belong at the hearing, printed.
Is it worth filing without strong comps?
Possibly. Pull CCAD's published values for similar homes nearby first — if yours sits high per square foot, that alone supports an unequal-appraisal case.
What does a protest cost me?
Filing itself is free at CCAD. The expense only appears if you bring in a firm working on contingency.