Collin County · over-assessed homes overpay year-round · next deadline May 15, 2027
Collin County Property Tax Appeal Guide
Collin County homeowners can protest their property taxes by filing with the Collin Central Appraisal District (Collin CAD) before May 15, or by mid-July under Texas Property Tax Code Section 41.44(b) for late protests. Our analysis of 356,172 Collin County homes found 17.5% assessed above comparable sales, with average potential savings of $1,058/year.
Plano / Frisco homeowners save an average of $1,058/year when they appeal with strong comparable evidence. 86% of well-prepared protests succeed.
How property tax appeals work 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 deadline is May 15, 2027, or 30 days after your appraisal notice was mailed, whichever is later.
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
- May 15, 2027 (next protest window)
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.
Cities we cover in Collin County
Our protest kits work for homeowners across Collin County, including:
Ready to appeal in Collin County?
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Start Your Appeal →Texas protest guides
Collin County protest guides
See the full data behind these numbers in our Texas Over-Assessment Study.