This August, the Columbia Falls City Council walked through numbers for its 2026-27 budget that put a fine point on something buyers comparing towns in the Flathead Valley need to understand before they write an offer. A primary residence assessed at $600,000 would see its city general fund tax bill fall by about $359, landing near $777 for the year. A second home or short-term rental assessed at that same $600,000 would rise by $558.54. Same city. Same assessed value. A difference of roughly $918 a year that has nothing to do with the house itself.
That gap is not a Columbia Falls quirk. It is the leading edge of a statewide reclassification that changed how every residential property in the Flathead Valley gets taxed, and it means the question worth asking before you compare Whitefish to Kalispell to Columbia Falls is not really about the town. It is about a box you check on a state form.
The line Montana drew between two kinds of owners
Montana's 2025 Legislature passed a pair of bills, Senate Bill 542 and House Bill 231, that rebuilt residential property taxation starting with 2026 bills. The core move: homes enrolled as a homestead, meaning the owner lives there at least seven months of the year, or long-term rentals leased in 28-day-or-longer increments to a tenant who occupies the unit for at least seven months, sit on a graduated rate track that keeps most values under 1 percent. Everything else, meaning second homes, vacation properties, and short-term or Airbnb-style rentals, moved to a flat 1.90 percent rate.
Both categories cover the exact same physical house. What changes the bill is how the owner uses it and whether they filed the paperwork saying so.
Why Flathead County buyers feel this more than most
A preliminary analysis the Montana Department of Revenue released in May 2025 projected that homestead-enrolled homeowners in Flathead County, the county that includes Kalispell, would see roughly a 27 percent average decrease in their tax bills over two years. Missoula County, by comparison, was projected at closer to 13 percent.
That is not because Flathead County lawmakers wrote a better deal for locals. It is because the county has an unusually large share of properties that do not qualify for the lower rate. Second homes and short-term rentals absorb a bigger portion of the tax base here than in most Montana counties, so when the law shifted weight away from homesteaded owners, there was more weight to shift. The valley's popularity with vacation buyers is the same force that is now lightening the load for the neighbor who lives there year-round.
Here is how the three tracks break down:
| Occupancy type | Rate structure | What qualifies |
|---|---|---|
| Primary residence (homestead) | Graduated, under roughly 1% for most home values | Owner occupies the home at least 7 months of the year, filed with the state |
| Long-term rental | Same graduated track as homestead | Leased in 28-day or longer increments, tenant occupies at least 7 months of the year |
| Second home or short-term rental | Flat 1.90% | Vacation home, seasonal use, or nightly/weekly rental not enrolled under either category above |
Whitefish adds a second layer
Kalispell and Columbia Falls sit inside the state framework above. Whitefish layers something older and more local on top of it.
Whitefish voters approved a 3 percent resort tax back in 1995 by a 56 to 44 margin, collected on lodging, restaurants, bars, ski resort goods and services, and defined luxury retail. Voters extended it in 2021 through January 2045. A quarter of what it collects goes straight to property tax relief. For the coming fiscal year, that credit comes to $2,439,028, equal to a 20.1-mill reduction across the city, according to a Whitefish city budget update published this month. Over the past eight years, the city's share of the tax bill on a $1 million home has averaged just 2.5 percent growth annually, largely because that resort tax revenue keeps absorbing pressure that would otherwise land on mills.
The practical effect: a full-time Whitefish homeowner gets a lower city tax rate that visitors and part-time owners are helping fund every time they eat dinner downtown or buy ski gear. A second-home owner in Whitefish is paying into that same resort tax pool at checkout while also carrying the flat 1.90 percent state rate on their tax bill, without the homestead discount showing up on their own statement.
There is now a third layer for buyers looking just outside city limits. Residents in the unincorporated area around Whitefish Mountain Resort voted in January 2025 to create the Big Mountain Resort Area District, with its own separate 3 percent resort tax. The district collected about $1.5 million in its first year and made its first distributions in July 2026, including a $395,000 check to the Big Mountain Fire District. That area falls under Flathead County Sheriff's Office jurisdiction rather than city police, and response times from the county can run up to an hour and a half. A home a few miles outside Whitefish city limits can look like a bargain next to one inside them, but it comes with a different tax mechanism and a different emergency response reality attached.
Sen. Greg Hertz, one of the lawmakers who has pushed back on how this system came together, put the frustration plainly: "We need to get back to a less complicated property tax system."
A paperwork deadline that outweighs square footage
Homestead status does not transfer with a sale. If you buy a home in Flathead County from an owner who was enrolled, you have to file your own application with the state, not simply inherit theirs. The window for enrollment runs from December 1 through March 1 each year, meaning anyone planning to close on a primary residence in Flathead County ahead of the 2027 tax year needs that filing done well before next spring.
There is a wrinkle worth flagging if you are structuring a purchase through an LLC or a trust. Properties held in certain entity types may not qualify for homestead status even when the owner genuinely lives there full time. Buyers who plan to hold property this way should raise the question with their closing team before signing rather than after the first tax bill arrives.
The legal question still hanging over the 2026 rules
None of this is fully settled. In January 2026, Sen. Greg Hertz, Senate Majority Leader Tom McGillvray, and former legislator Keith Regier sued the state and the Department of Revenue in Gallatin County District Court, arguing SB 542 was amended so extensively during the legislative process that it violated the Montana Constitution's requirements that a bill stick to a single subject and its original purpose. Gov. Greg Gianforte asked the Montana Supreme Court to take the case directly and rule quickly, warning that a loss could unwind roughly $95 million in rebates already paid out. The Supreme Court declined that request on March 31, 2026, and sent the matter back to the district court, where it remained unresolved as of the most recent reporting this summer. No ruling has surfaced since.
Buyers signing purchase agreements in the Flathead Valley right now are pricing a tax structure that a district court judge could still revise. The Montana Legislature does not reconvene until January 2027, and even lawmakers who disagree on the lawsuit's merits, including Hertz and Rep. Llew Jones, agree that property tax will be back on the table then regardless of how the case resolves.
A few questions before you sign
If I buy a home that already has homestead status, do I inherit it? No. The classification is tied to the previous owner's use, not the property itself. You have to file your own application with the Montana Department of Revenue after closing.
What exactly counts as a long-term rental for the lower rate? A lease of 28 days or longer, with the tenant using the home as their residence for at least seven months of the year. A property rented out nightly or weekly, even if it sits empty most of the year, falls into the flat 1.90 percent category instead.
What happens to my tax bill if the lawsuit succeeds? It is genuinely unclear. Gov. Gianforte has argued a loss could reverse the relief that roughly 80 percent of Montana homeowners saw on their 2025 and 2026 bills, while the plaintiffs maintain they are not asking for rebates to be clawed back, only for the process that created the law to be reviewed. Until the district court rules, current law stands.
The town you choose in the Flathead Valley still matters for lifestyle, commute, and lot size. But the number that actually shows up on your tax bill next spring depends less on whether you buy in Kalispell, Whitefish, or Columbia Falls, and more on a form you either filed by March 1 or didn't. If you are weighing a purchase anywhere in the valley and want help running the real numbers for a specific property, reach out to Ashley Inglis for a personalized market consultation.
