Montana lawmakers overhauled the state’s property tax system this year, responding to years of complaints from homeowners who watched their tax bills climb sharply after a statewide reappraisal pushed residential values up much faster than commercial and industrial property values. The result is a new law that changes how tax rates are calculated based on a property’s value and use, and that shifts more of the tax burden away from primary residences.
For homeowners, the practical effect will show up on tax bills mailed later this year and in notices already arriving from county assessors. Understanding how the new structure works, and what options exist to challenge an assessment or claim an exemption, can make a meaningful difference in what a household ultimately owes.
Why lawmakers revisited property taxes
The pressure for change built after Montana’s 2023 property reappraisal, which found that residential values in many counties had risen far more than commercial and agricultural values over the preceding reappraisal cycle. Because Montana’s tax system spreads the total local tax burden across all taxable property in a jurisdiction, a value increase concentrated in homes means homeowners end up covering a larger share of local government and school budgets, even when tax rates themselves stay flat.
State legislators from both parties said during the session that the imbalance had become politically untenable, particularly in fast-growing counties such as Gallatin, Flathead and Missoula, where home values rose the most. The new law was designed to correct that imbalance without eliminating the revenue that counties, cities and school districts rely on.
What the new law changes
The legislation replaces Montana’s previous flat residential tax rate with a system that varies depending on how a property is used and, in some versions of the reform, how much it is worth relative to the median home value in its area.
A tiered rate structure
Instead of taxing every home at the same rate regardless of value or use, the new law creates separate rate categories. Primary residences occupied by their owners are taxed at a lower rate than second homes, vacation properties and short-term rentals. Long-term rental housing occupied by tenants also qualifies for a reduced rate under the law, an effort by lawmakers to avoid discouraging the construction and maintenance of rental housing stock in a state facing a persistent housing shortage.
Relief targeted at owner-occupied homes
The core intent of the law is to direct relief toward Montanans who live in the home they own. Owners must generally certify that a property is their primary residence to receive the lower rate, a process handled through the Montana Department of Revenue rather than automatically applied. Homeowners who fail to file the required certification risk being taxed at the higher, non-primary-residence rate even if they do live in the home full time.
Higher rates for second homes and short-term rentals
Properties that do not qualify as a primary residence, including vacation homes, investment properties advertised as short-term rentals, and homes owned by out-of-state residents, are taxed at a higher rate under the new structure. Lawmakers who supported this approach argued that owners of high-value second homes and vacation rentals, many purchased by out-of-state buyers during the pandemic-era influx into Montana, were contributing to the valuation surge without necessarily paying a proportionate share of the resulting tax burden.
How this affects homeowners’ bills
The size of any change to an individual bill depends on several factors: the assessed value of the property, whether it qualifies as a primary residence, the tax rates set by local taxing jurisdictions, and any exemptions the owner claims. Because Montana’s system layers state rate classifications on top of locally set mill levies, two homes with similar values in different counties, or even different school districts within the same county, can see different results.
Homeowners who occupy their homes full time and previously felt squeezed by rising valuations should generally see a smaller increase, or in some cases a reduction, compared with what they would have owed under the old flat-rate system. Owners of second homes, vacation properties and short-term rentals are more likely to see their bills rise, since those categories now carry a higher rate under the law.
County treasurers’ offices and the Department of Revenue are the most reliable sources for a specific bill estimate, since local mill levies set by school boards, city councils and county commissions still factor heavily into the final amount owed.
Appealing an assessment
Property owners who believe their assessed value is inaccurate retain the right to appeal, a process that has not changed under the new law even though the rates applied to that value have.
Steps to file an appeal
- Review the classification and appraisal notice mailed by the county assessor’s office, checking the listed square footage, lot size, condition and comparable sales used to set the value.
- Contact the local Department of Revenue field office to request an informal review before filing a formal appeal, which can sometimes resolve simple data errors without a hearing.
- File a formal appeal with the county tax appeal board if the informal review does not resolve the disagreement, providing supporting evidence such as recent comparable sales, an independent appraisal, or photographs documenting the property’s condition.
- Attend the scheduled hearing, where the appeal board will consider the evidence presented by both the property owner and the assessor’s office before issuing a decision.
Deadlines to watch
Appeal deadlines in Montana are tied to the date printed on the assessment notice, and owners typically have a limited window, measured in weeks rather than months, to file after that notice is mailed. Missing the deadline generally forecloses the ability to challenge that year’s valuation, so property owners are advised to calendar the date as soon as the notice arrives rather than waiting until a final tax bill is issued later in the year.
Exemptions and relief programs worth checking
Beyond the new rate structure, Montana continues to offer several longstanding relief programs that many eligible homeowners do not claim simply because they are unaware the programs exist.
- Property Tax Assistance Program (PTAP), which reduces the tax rate on a primary residence for homeowners who meet income limits set by the state.
- Elderly Homeowner/Renter Credit, available to older residents who meet age and income requirements, providing a credit against state income tax based on property taxes or rent paid.
- Disabled American Veteran exemption, which reduces or eliminates property taxes on the primary residence of qualifying veterans with a service-connected disability.
- Land value exemptions for agricultural property, which remain in place for working farms and ranches meeting state use requirements, separate from the residential rate changes.
Applications for these programs are handled through the Department of Revenue, and most require renewal or income verification on a periodic basis rather than a one-time application.
Conclusion
Montana’s new property tax law represents the most significant restructuring of residential tax rates in years, aimed at easing the burden on full-time homeowners while asking owners of second homes and short-term rentals to shoulder a larger share. The size of the change for any individual household will depend on local mill levies, the property’s classification, and whether the owner has taken the steps needed to certify a primary residence or claim an available exemption. Homeowners with questions about their specific bill are encouraged to contact their county treasurer or the Montana Department of Revenue directly, since local rates and deadlines vary across the state.