Deadlines & Filing Methods
You must file by May 15, 2026 (or 30 days after your Notice of Appraised Value, whichever is later).
- ✓Online: iFile at collincad.org - fastest, receipt confirmation instant
- ✓Email: [email protected] with your property ID + reason
- ✓In person: Collin CAD office at 250 Eldorado Pkwy, McKinney
Evidence That Works
The ARB (Appraisal Review Board) responds best to:
- ✓3-5 comparable sales within 0.5 miles sold in the last 6 months at lower $/sqft
- ✓Photos of deferred maintenance (roof, foundation cracks, aging HVAC)
- ✓A written appraisal from a licensed appraiser (costs $300-500 but typically saves $1,000+ in taxes)
- ✓Unequal appraisal argument: show that similar homes on your street are appraised lower
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