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 Toole County Treasurer/Assessor / Montana Department of Revenue Property Assessment Division.
Effective rate
no single countywide effective rate was published; Montana county, municipal, school, and special-district mill levies vary by taxing jurisdiction.
Statement mailing
Usually mailed in late October 2026 under Montana DOR guidance; no specific county mailing date was published.
Payment deadline
Tax year 2026 Montana real-property taxes: first payment due by 5:00 p.m. November 30, 2026; second payment due by 5:00 p.m. May 31, 2027. If a due date falls on a weekend or holiday, the next business day applies; county notice/postmark rules also apply.
Valuation protest
Submit Montana DOR Form AB-26 within 30 days of the date on the 2025–2026 classification and appraisal notice. If that deadline was missed, the 2026 fallback informal-review deadline was June 1, 2026; formal appeals may proceed to the Montana Tax Appeal Board. Official process: https://revenue.mt.gov/property/appraisal/appeals-and-reviews.
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.