Skip to main content
Published April 19, 2021

The inflation factor for FY 2022 is 0.93%.  Per 15-10-420, MCA, “a governmental entity that is authorized to impose mills may impose a mill levy sufficient to generate the amount of property taxes actually assessed in the prior year plus one-half of the average rate of inflation for the prior 3 years.”

Additionally, the Department of Revenue shall, “calculate one-half of the average rate of inflation for the prior 3 years by using the consumer price index (CPI), U.S. city average, all urban consumers, using the 1982-84 base of 100, as published by the bureau of labor statistics of the United States Department of Labor.”

One-half the average rate of (compounding) inflation was determined by taking the cubed root of the CPI for December 2020 (260.474) divided by the CPI for December 2017 (246.524), subtracting one, and multiplying the result by 50%.

FY 2022 Inflation Factor Mill Levy Calculation FormulaIf you have any other questions, please contact Eric Dale, Tax Policy and Research at DOA, by way of email at edale@mt.gov or by phone at 406-444-7925.

Eric Dale  |  Tax Policy and Research  |  Department of Administration  |  edale@mt.gov  |  (406) 444-7925