Montana maintains a low property tax burden with a statewide effective rate of roughly 0.61%. The state uses a complex fractional assessment system that heavily favors primary homeowners, assessing the first tier of a primary home’s value at just 0.76%. To combat rising home values, state laws stringently restrict local governments from increasing tax revenues beyond half the rate of inflation (est., Tax Foundation 2026 / U.S. Census ACS 2023).
Unlike states that allow local governments to increase revenue freely during housing booms, Montana legally shackles property tax revenue to the rate of inflation. Between these strict state caps and the newly introduced tiered assessment ratios that protect primary homeowners, Montana actively works to keep residents from being taxed out of their homes.
Tiered Assessment Ratios and the 2-Year Cycle
Montana recently moved away from a flat assessment ratio for primary residences. Instead of taxing you on 100% of your home’s market value, the state applies a complex fractional, tiered assessment ratio for primary homes (effective for the 2025/2026 cycle):
- Up to $400,000: Assessed at just 0.76%.
- $400,001 to $1.5 million: Assessed at 1.10%.
- Over $1.5 million: Assessed at 2.20%.
For example, if you own a $300,000 home, your Taxable Value is only $2,280 ($300,000 x 0.0076). Your local mill levies are then applied to that drastically reduced figure.
To ensure fairness, the Montana Department of Revenue reappraises all residential and commercial property uniformly on a two-year cycle.
Montana statewide effective rate. On a $400,000 home, expect approximately $2,440 per year at the statewide average. (est., Tax Foundation 2026 / Census ACS 2023).
| Home Value | Annual Tax (est.) | Monthly Payment | vs. U.S. Average |
|---|---|---|---|
| $200,000 | $1,220 | $101 | -$580 below avg. |
| $400,000 | $2,440 | $203 | -$1,160 below avg. |
| $600,000 | $3,660 | $305 | -$1,740 below avg. |
| $800,000 | $4,880 | $406 | -$2,320 below avg. |
| $1,000,000 | $6,100 | $508 | -$2,900 below avg. |
Estimates use 0.61% statewide effective rate. U.S. average uses 0.90%. Source: est., Tax Foundation / Census ACS 2023.
Strict Limits on Mill Levy Revenue Increases
Under Montana Code Annotated 15-10-420, local governments are heavily restricted from cashing in on property value spikes.
State law dictates that a local governmental entity cannot collect more property tax revenue than it did the previous year, plus an adjustment for inflation and new construction.
The inflation limit is capped at a maximum of 4% (often structurally calculated as half the average rate of inflation for the prior three years). Because of this cap, when the state reappraises properties and values jump by 20%, local governments are legally forced to lower their mill levies so their total revenue collected does not exceed the inflation limit.
Property Tax Assistance Program (PTAP) & Veterans
Montana offers significant direct relief to vulnerable homeowners based on income and military service.
- Property Tax Assistance Program (PTAP): Designed for homeowners with fixed or limited incomes. It reduces the property tax rate on the first $418,000 of a primary residence’s market value by 30%, 50%, or 80%, depending heavily on income brackets.
- Montana Disabled Veteran (MDV) Program: Provides a 50%, 70%, 80%, or 100% tax rate reduction for veterans with a 100% service-connected disability (or their unmarried surviving spouses). Unlike PTAP, the MDV program has no limit on the market value of the home it applies to.
Major County Tax Rates in Montana
Missoula and Yellowstone counties carry the highest effective property tax rates in the state (over 0.80%). Because these counties are the primary urban hubs for the state, they levy more taxes to support extensive infrastructure and large school districts.
Conversely, Flathead County (Kalispell) maintains one of the lowest effective rates in the state at 0.54%. Massive luxury property values and secondary home ownership around Glacier National Park and Flathead Lake generate substantial tax revenue, keeping the rate low for local residents.
| County | Effective Rate | Annual Tax on $400k Home | Notes |
|---|---|---|---|
| Yellowstone County | 0.82% | $3,280 | Includes Billings; most populous county, higher mill levies. |
| Gallatin County | 0.64% | $2,560 | Includes Bozeman; high home values keep rate near state avg. |
| Missoula County | 0.85% | $3,400 | Includes Missoula; highest effective rate in the top 10. |
| Flathead County | 0.54% | $2,160 | Includes Kalispell; lowest effective rate in the top 10. |
| Cascade County | 0.75% | $3,000 | Includes Great Falls. |
| Lewis and Clark County | 0.77% | $3,080 | Includes Helena (State Capital). |
| Ravalli County | 0.70% | $2,800 | Includes Hamilton / Bitterroot Valley. |
| Silver Bow County | 0.75% | $3,000 | Includes Butte. |
| Lake County | 0.65% | $2,600 | Includes Polson. |
| Lincoln County | 0.68% | $2,720 | Includes Libby. |
Disclaimer and Methodology
This calculator provides estimates for planning purposes only, based on historical effective property tax rates (actual median taxes paid divided by full market value). Under Montana law, residential property is assessed fractionally using a tiered structure, and mill levies are dynamically capped by inflation indices. This calculator uses “effective rates” to bypass the highly complex state fractional math, providing a highly realistic estimate of actual homeowner burden.
What this calculator does not account for:
- State-issued property tax rebates, such as the $675 direct rebates issued in 2023 and 2024, which lowered out-of-pocket costs after the county tax bill was paid.
- Secondary homes or commercial properties, which are subject to entirely different (and higher) assessment tiers than primary residences.
How to get an accurate estimate:
- Find your home’s Market Value on your classification and appraisal notice from the MT Dept. of Revenue.
- Determine your Taxable Value using the state’s tiered assessment ratios (e.g., 0.76% for the first $400k).
- Multiply the resulting Taxable Value by your local mill levy, and divide by 1,000.
Data sources: Statewide effective rate and county effective rates derived from U.S. Census Bureau ACS 2023 and SmartAsset aggregations. Statutory rules, inflation caps, and tiered ratios from the Montana Department of Revenue.
Return to the National Property Tax Calculator to compare Montana with other states.