Montana's New Property Tax: How Primary vs. Second-Home Rates Affect Your Bottom Line

The Bottom Line

Beginning with 2026 property tax bills, Montana applies a tiered residential property tax: primary residences enrolled at Homestead.MT.gov pay graduated rates of 0.76%–1.10% on most value, while second homes and short-term rentals pay a flat 1.90%. For a $2.5M lakefront, that’s the difference between roughly $33,750/year under the old 1.35% uniform rate and $47,500/year under the new structure — a roughly 40%+ increase, projected to compound to roughly 68% over two years for non-primary residences.

If you’re buying a Montana home as a primary residence, the new homestead application is the single most important paperwork you’ll do. If you’re buying a second home or planning short-term rentals, the underwriting math has changed materially. This is the post we’re emailing every prospective buyer.

What changed

Montana House Bill 231 and Senate Bill 542 (passed in the 2025 legislature) restructured residential property taxation. Two big shifts:

1. Tiered rates by use type. Primary residences enrolled in the new homestead program get graduated rates that scale from 0.76% to 1.10% based on assessed value. Non-primary residences — second homes, vacation properties, and short-term rentals — get a flat 1.90%.

2. Homestead application required. To get the lower rate, the property owner must enroll at Homestead.MT.gov and certify primary-residence use. The application is straightforward but the deadline matters: the cutoff for the 2026 tax year was March 1, 2026; future years follow the same March 1 deadline.

Worked example: $2.5M lakefront on Flathead

To see the math, take a $2.5M lakefront home on the west shore of Flathead Lake.

Under the old 1.35% uniform rate (2024 and prior):

• Annual property tax: roughly $33,750 (before mill-levy adjustments)

Under the new structure as a primary residence (homestead-enrolled):

• Graduated rate of approximately 1.10% applied to most of the assessed value: roughly $27,500/year. The primary-residence buyer pays less than under the old rate.

Under the new structure as a second home or STR:

• Flat 1.90% rate: roughly $47,500/year. The second-home buyer pays roughly 40% more than under the old rate, and roughly 73% more than the primary-residence neighbor next door.

The cumulative impact over a multi-year hold is significant. On the same property, a second-home buyer pays roughly $200,000 more in property taxes over a decade than a primary-residence neighbor in the same home. That’s a real number that has to live in any honest underwriting model.

What this means for buyers

If you’re buying a primary residence: Enroll on Homestead.MT.gov within the first cycle. Set a calendar reminder for the March 1 deadline annually. The homestead designation persists, but reapplication is required if you change use type (e.g., move out and convert to a rental).

If you’re buying a vacation home or seasonal property: Plan for the 1.90% rate in your underwriting. For a typical $1M–$3M Flathead Lake property, that adds $5,000–$15,000 per year to carrying costs versus the prior law. STR income projections need to be net of this.

If you’re buying as an LLC or trust: The structure matters. Properties held in some entity types may not qualify for homestead status even when used as a primary residence. We coordinate with your CPA and attorney on the structure decision before closing.

If you have multiple Montana properties: Only one can be designated as primary. Plan accordingly — many out-of-state buyers with a Whitefish ski property and a Flathead Lake summer home need to choose which gets the homestead rate, and the choice has tax implications across both properties.

What this means for sellers

If you’re selling a primary residence to a buyer who plans to use it as a second home, expect their underwriting to reflect the new tax burden. This may mean slightly softer offers in segments where second-home buyers dominate (lakefront, Whitefish luxury). Conversely, if your buyer plans to homestead, the lower rate is a feature you can highlight in the pitch.

For homeowners considering a sell-and-buy within Montana, the homestead designation does not transfer with the property — the new owner re-applies. If you’re downsizing within the state, you’ll need to re-establish homestead status on the new property.

Open questions and active litigation

SB 542 is in active litigation. The Montana Supreme Court declined to fast-track the case in late 2025; the District Court matter remains open. If the law is overturned or modified, the math changes — and we update buyers when it does. As of mid-2026, the structure as described above is current.

The other open question is whether the legislature will further refine the rates in the 2027 session, particularly around treatment of long-term rentals (currently the 1.90% rate applies to STRs but treatment of long-term rentals is ambiguous in some interpretations). This is worth tracking.

What to do next

1. If you’re a current Montana primary residence owner: Verify your homestead status at Homestead.MT.gov. Re-enroll if you missed the deadline or recently changed use.
2. If you’re a buyer: Build the new tax structure into your underwriting model. We provide a worked tax projection on every offer.
3. If you’re a seller: Understand how the buyer’s use type affects their offer math. Pricing in a lakefront or vacation segment may have moved more than top-line market data shows.

For the specific math on your situation, a CPA who works with Montana primary and non-primary structures is the right resource. We coordinate referrals when helpful.