2026 fiscal calendar
Know the tax date before it becomes a penalty date.
Tax bills, payment rules, and valuation-review windows are controlled by the local jurisdiction and the governing state framework. The verified record below separates published figures from dates that require confirmation with Collin Central Appraisal District.
Effective rate
Collin County publishes tax rates by taxing entity and property location, not one countywide effective rate.
Statement mailing
October 2026; the Collin County Tax Assessor-Collector states tax statements are mailed in October, but the official 2026 sources reviewed do not publish a specific day.
Payment deadline
2026 property tax statements are due upon receipt; the Collin County Tax Assessor-Collector states January 31, 2027 is the deadline to avoid penalties and interest, with statutory postponement rules for late-mailed bills.
Valuation protest
May 15, 2026 for real property, or the later deadline printed on the Notice of Appraised Value; Collin CAD published May 15, 2026 as the 2026 real-property deadline.
Critical payment warning
Do not assume a grace period.
The verified county record identifies the payment timing above but does not establish a universal penalty schedule for this page. Late charges, interest, collection costs, tax-sale procedures, and lien or foreclosure timelines can depend on state law and the local collector’s process. If the deadline is close or a balance is delinquent, contact the tax collector directly and request the current payoff amount in writing.
Treat the published payment deadline as a hard operational date and retain your receipt or confirmation number.
Read the calendar in order
From assessment to collection
1. Valuation and notice
Review the assessment notice as soon as it arrives. The protest window may run from the notice date rather than from the payment due date.
2. Statement and account review
Match the tax statement to the parcel or account number and confirm exemptions, assessed value, taxing units, credits, and balance.
3. Payment confirmation
Use the official collector channel, then save the receipt, transaction reference, and date posted. A bank submission is not always the same as a county posting date.