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 Caribou County Assessor.
Effective rate
Idaho county tax bills are based on taxing-district-specific levies; the reviewed official county sources do not publish one countywide effective property-tax percentage.
Statement mailing
By November 23, 2026 (the fourth Monday in November); Idaho's official property-tax guidance states most county tax bills are mailed by that date.
Payment deadline
December 21, 2026 for the full amount or first half (statutory December 20 falls on Sunday; next business day); second half June 21, 2027 (statutory June 20 falls on Sunday; next business day).
Valuation protest
June 22, 2026 (the fourth Monday in June) for the 2026 assessment appeal; contact the county assessor promptly after receiving the assessment notice.
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.