Collin County · Check the filing deadline on your notice
Severely over-appraised? A § 25.25(d) correction is still open until January 31, 2027 →
Collin County Property Tax Protest: Deadline and DIY Options
Prepare your Collin County property tax protest with the appraisal district instructions, your notice and your own evidence. Compare a representation service with the $29 DIY kit before choosing how to proceed.
Start with your notice and county record. A kit helps you organize the work; a reduction depends on your evidence and the review board.
Plano property tax protest: companies vs DIY
A representation company may handle the protest under its service agreement. Compare the total fee, cancellation terms and who attends the hearing. With DIY, you prepare the evidence and submit the protest yourself. AppealMyTax sells guides and data; we do not file or represent you.
Use the appraisal district named on your notice, not your mailing city alone. Plano addresses can cross county boundaries. This section links the Collin County route; confirm it applies to your parcel.
Check your notice before filing
The usual Texas deadline is the later of May 15 and 30 days after the appraisal notice is mailed. Weekend and legal-holiday deadlines move to the next regular business day. The ordinary 2026 May window has passed; a later notice or a special correction route needs its own eligibility check. Prepare your records now and confirm the current district instructions for your tax year.
Sources checked September 14, 2026: Collin CAD instructions, Texas protest deadline rule and weekend and holiday rule.
How to protest property taxes in Collin County
Every Texas homeowner has a right to protest their assessed value under Texas Property Tax Code §41.41. In Collin County, protests are handled by the Collin Central Appraisal District (Collin CAD). The usual deadline is May 15 or 30 days after your appraisal notice was mailed, whichever is later. A weekend or legal-holiday deadline moves to the next regular business day. Confirm your district calendar and tax year.
Collin CAD has one of the most digitized protest systems in Texas. Online filing through their portal is standard, and informal hearings often resolve in 10 minutes with good evidence.
The strongest protests include 3-7 comparable sales from the last 12 months in your immediate neighborhood, adjusted for square footage, age, and condition. Plano / Frisco-area assessors typically reduce values when presented with clear, recent comp data.
Collin County is one of the counties in our Texas Over-Assessment Study, where we ran millions of homes through the same unequal-appraisal comparison the Collin CAD uses. You can check your own address free in 30 seconds, or read our full methodology first.
File With
Collin Central Appraisal District
- Address
- 250 Eldorado Pkwy, McKinney, TX 75069
- Phone
- (469) 742-9200
- Website
- collincad.org
- Next deadline
- Check your notice and district calendar (notice and business-day rules apply)
Live · pulled from Collin CAD public records
$133,412,236 in projected annual overpayments across 30 Collin County ZIPs.
Most overassessed ZIPs in Collin County
Ranked by total annual projected overpayment. Drill into any ZIP for the top flagged homes.
Check your Collin County assessment
Check free first. The complete Audit is $49 once and provides filing-ready evidence when supported, or a valuation and county-record report when it is not. No percentage fee. 30-day money-back guarantee.
Check My Property →Texas protest guides
Collin County protest guides
See the full data behind these numbers in our Texas Over-Assessment Study.