MT · 2026 appeal calendar

Montana Property Tax Appeal Deadlines 2026.

Montana property tax appeal deadlines and filing windows for commercial real estate. Verify with your local assessor or appeal board for the specific jurisdiction before filing.

Updated May 2026

Verify before filing. Statutory deadlines change, and many counties operate on their own schedule inside the state framework. Always confirm the current year's window with the assessor or appeal board for the specific jurisdiction before relying on a date.

2026 appeal calendar

Montana deadlines at a glance.

State-level deadlines plus major sub-jurisdictions where the schedule diverges from the state default. Where a column says "Varies," confirm the date with the local assessor.

Month Type Event Date Details
June Both
Value Notices Issued
Varies MT reassess every 2 years, the next evaluation will be in 2019. The value notices are issued in 2017.
June Both
Appeal Deadline
Varies The later of the 1st Monday in June or 30 days after receiving either 1) a notice of classification and appraisal or 2) a determination after the assessment review procedure

RP = Real Property · BPP = Business Personal Property · Both = Applies to both

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