Tax Code Reference
Effective Rate: 0.61%
Montana
Property Tax Code
Montana Code Annotated — Title 15 (Taxation) — Complete reference for assessment procedures, appeal rights, exemptions, and key statutes governing property taxation in Montana.
Quick Facts
Assessment Authority
Montana Department of Revenue
Appeal Board
State Tax Appeal Board
Assessment Ratio
100% of market value; graduated class 4 residential rates for primary residences and long-term rentals (tax year 2026, HB 231 of 2025): 0.76% up to the statewide median residential value, 0.90% up to 2x median, 1.10% up to 4x median, 1.90% above 4x median; other residential property 1.90%
Assessment Cycle
Biennial
Appeal Deadline
30 days from the date on your notice; in an intervening year with no new notice the deadline is June 1
Assessment System
Governing CodeMontana Code Annotated — Title 15 (Taxation)
Assessment AuthorityMontana Department of Revenue
Assessment Ratio100% of market value; graduated class 4 residential rates for primary residences and long-term rentals (tax year 2026, HB 231 of 2025): 0.76% up to the statewide median residential value, 0.90% up to 2x median, 1.10% up to 4x median, 1.90% above 4x median; other residential property 1.90%
Assessment CycleBiennial
Appeal System
Appeal BoardState Tax Appeal Board
Appeal Deadline30 days from the date on your notice; in an intervening year with no new notice the deadline is June 1
Key Notes for Montana
Montana's Department of Revenue assesses all property statewide. The biennial reappraisal cycle means values are updated every two years. HB 231 (2025) replaced the former flat residential rate with graduated homestead rates keyed to the statewide median residential value (estimated at $395,400 for the 2025-2026 cycle).
Hearing Types Available
1
Informal appeal to DOR2
State Tax Appeal Board3
District CourtValid Grounds for Appeal
Overvaluation
Incorrect classification
Denial of benefit