Montana’s New Second Home Property Tax: What Homeowners Need to Know

Montana’s property tax system has undergone a major restructuring that changes how residential property is classified and taxed statewide. The new approach introduces tiered rates for many homes, while placing second homes and short-term rentals into a higher, flat-rate category.

The result is a significant shift in how the overall property tax burden is distributed across the state.

Overview of the New Tax Structure

Montana now uses a combination of tiered and classification-based taxation:

Most owner-occupied homes and qualifying rentals use a graduated tiered system
Second homes and short-term rentals are generally taxed at a flat higher rate
Tax liability is increasingly based on how the property is used, not just its value

This represents a shift away from a one-size-fits-all residential tax model toward a use-based system.

Statewide Tiered Tax Rates (Primary Residences & Qualifying Rentals)

For homes that qualify as a primary residence or long-term rental, Montana applies a progressive structure based on value:

0.76% on the first ~$400,000 of value

1.10% on value between ~$400,000 and $1.5 million

2.20% on value above ~$1.5 million

This tiered structure applies to most standard residential properties that meet homestead or long-term rental qualifications.

Second Homes and Short-Term Rentals

Properties that do not qualify as a primary residence or long-term rental are placed into a separate classification.

This typically includes:

Vacation homes
Seasonal residences
Short-term rentals (Airbnb/VRBO-type use)
Investment properties not used for long-term housing

Flat Tax Rate

These properties are generally taxed at a flat rate around 1.90%, regardless of value tier.

This change removes access to lower entry-level rates that primary residences benefit from, especially on lower and mid-range home values.

How the Tax Burden Is Shifting

The restructuring creates a clear redistribution of tax responsibility:

Property Types Likely to See Lower or Stabilized Taxes

Primary residences (owner-occupied homes)

Long-term rental housing (28+ day occupancy)

Some moderate-value homes that benefit from lower tier brackets

Property Types Likely to See Increases

Second homes

Short-term rentals

High-value investment properties

Out-of-state owned vacation homes

Key Shift

More of the statewide tax base is now carried by non-primary residential properties, particularly in high-demand recreation and tourism regions.

County-Level Impacts Across Montana

While the law is statewide, the effects vary significantly depending on housing demand, property values, and second-home concentration.

Gallatin County (Bozeman / Big Sky)

Gallatin County is among the most impacted areas in Montana due to:

Rapidly rising home values

Heavy concentration of second homes in Big Sky and surrounding areas

Strong short-term rental market

A high percentage of properties exceeding tier thresholds

Local Impact

Primary residences may see more stable or modest changes depending on value

Second homes and luxury properties are more likely to fall into higher tax brackets or flat-rate classification

High-value homes are disproportionately affected by the top-tier rates

Gallatin County sees one of the largest overall shifts because more properties exceed the higher value thresholds than in most other counties.

Lewis & Clark County (Helena Area)

Lewis & Clark County has a more balanced housing profile:

Higher share of government, workforce, and long-term residential housing

Fewer luxury second-home properties compared to resort counties

More stable overall home values

Local Impact

Most primary residences experience moderate changes

Less exposure to large increases tied to second-home taxation

The impact is more evenly distributed across residential property types

Overall, Lewis & Clark tends to see a more muted version of the statewide changes compared to high-growth areas.

Flathead County (Kalispell / Whitefish / Flathead Lake)

Flathead County is one of the most affected regions due to its strong second-home and tourism-driven market:

High concentration of lakefront and mountain vacation homes

Strong short-term rental activity in Whitefish and surrounding areas

Significant number of out-of-area property owners

Rapid appreciation in home values over the last decade

Local Impact

Second homes and vacation properties around Flathead Lake and Whitefish are more likely to see meaningful tax increases under the flat-rate structure

Many high-value properties fall into higher effective tax brackets compared to statewide averages

Primary residences may see comparatively smaller changes, especially in lower and mid-range price segments

Flathead County’s mix of tourism-driven ownership and high appreciation makes it one of the clearest examples of the shift toward taxing non-primary residences more heavily.

Implementation Timeline

The changes are being phased in:

2025: Transition year with early adjustments and rebate-related impacts

2026: Full implementation of the classification system and tiered structure

By 2026, the distinction between homestead (primary residence/qualifying rental) and non-homestead properties is fully applied statewide.

What Property Owners Should Pay Attention To

With this system, classification is now just as important as value. Property owners should understand:

Whether their property qualifies as a primary residence

Whether long-term rental status applies

How short-term rental use affects classification

Filing or verification requirements for tax status

How ownership structure (LLC, trust, etc.) may impact eligibility

Incorrect classification can result in significantly higher tax bills.

Final Takeaway

Montana’s updated property tax system fundamentally changes how residential properties are taxed by shifting from a uniform approach to a use-based, tiered structure.

In general:

Primary residents and long-term housing providers benefit from lower or stabilized rates

Second homes and short-term rentals carry a higher tax burden

High-growth counties like Gallatin and Flathead see the most noticeable impact

More stable counties like Lewis & Clark experience more moderate shifts

For property owners across Montana, understanding classification has become essential to anticipating future tax liability.