A family from the Metroplex closes on a Bozeman home in May, packs up a ski closet, and plans to spend Christmas there with the kids before eventually retiring into it full time. Down the same street, another owner closes the same month on an almost identical house, same builder, same square footage, and lists it as a weekend rental between trips. Come October, when Gallatin County mails this year's property tax bills, those two owners open envelopes with meaningfully different numbers on the bottom line. The gap has nothing to do with the house. It comes down to a filing window that closed back in March, months before either family owned the property.
That is the story nobody selling a Montana ski home is telling a Texas buyer clearly enough: starting with 2026 tax bills, the sale price on the listing is only half the math. The other half is a classification decided by a deadline, not a deed.
The Law Behind Two Different Bills
In 2025, Governor Greg Gianforte signed Senate Bill 542, carried by Sen. Wylie Galt of Martinsdale, and House Bill 231, carried by Rep. Llew Jones of Conrad. Together, the bills rewrote how Montana taxes residential property, splitting every home in the state into one of two tracks for the 2026 tax year.
The first track, homestead, covers owner-occupied primary residences and qualifying long-term rentals (leases of 28 days or longer, for at least seven months of the year). Properties on this track are taxed on a tiered scale, where each bracket of a home's value is taxed at the rate assigned to that bracket, not the full value, according to the Montana Department of Revenue's own 2026 property tax guidance. The state projects this will cut the average homestead bill by roughly 18 percent, and the average long-term rental bill by about 22 percent, once fully phased in.
The second track, the default track, catches everything else: second homes, vacation properties, and short-term rentals booked through platforms like Airbnb or VRBO. These properties pay a flat 1.9 percent on every dollar of assessed value, with no bracket relief. The Montana Department of Revenue's own projections, reported by Montana Free Press, put the cumulative increase on non-homestead residential property at 68 percent by 2026, compared with an estimated 14 percent increase that would have applied under the old tax code.
Two rates, same state, same year. Which one applies to a given house depends less on how a family plans to use it and more on a form.
The Deadline That Already Closed
Enrollment in the homestead track is not automatic just because a family intends to live in a home full time. Owners who claimed Montana's 2025 property tax rebate and still own and occupy the same home for at least seven months in 2026 carried over automatically. Everyone else, including anyone who bought a home after that rebate cycle, had to apply during a window that ran from December 1, 2025 through March 1, 2026, per the Department of Revenue.
That window has already closed for this tax year. A family that closed on a Bozeman or Big Sky property this spring or summer, fully intending to make it a primary residence, could not have applied during that period because they did not yet own the home. Under the enrollment rule as written, that property lands on the default track, the same 1.9 percent flat rate assigned to a weekend rental, for the current tax bill regardless of how the family actually uses the house. The next enrollment window will not open until the following December.
For a buyer closing this fall, that means the first tax bill on a new Montana purchase may carry the second-home rate even for a home bought to live in year round. It is not a penalty for buying a vacation property. It is a mechanical consequence of when the deed was recorded relative to a filing calendar that has nothing to do with intent.
What the Number Actually Looks Like on a Luxury Property
For a true second home, the math is more concrete than the percentages suggest. According to an analysis from the law firm Parsons Behle & Latimer, nonresidents, second homes, and short-term rentals valued above $1.5 million will likely see an increase of approximately $8,250 a year once the new rate is fully in effect, assuming no change in the property's assessed value or local mill levies. Compare that against the roughly $700 annual decrease projected for a median-level homeowner enrolled in the homestead track, and the split becomes the single biggest variable in what a Montana ski house costs to hold, ahead of the purchase price itself.
That $8,250 is not a one-time adjustment. It is an annual carrying cost that shows up every October, for as long as the property stays classified as a second home.
The Legal Question Still in Play
None of this is fully settled. A group of Montana legislators filed suit challenging the new tax structure as unconstitutional, and as of early June 2026 the case remained pending in Gallatin County District Court, according to reporting from the Daily Montanan. Montana's Supreme Court had already declined the governor's request to take up the case directly, which keeps the litigation moving through the lower court rather than resolving quickly at the state level. For now, county assessors are still applying the rules as written, but a buyer running long-term numbers on a Montana purchase should know the framework could shift again before it fully settles.
Bozeman, Big Sky, and Whitefish Are Not the Same Bet
The classification question matters more or less depending on which Montana market a family is comparing. Bozeman's median sale price sat at $672,000 over the three months ending May 2026, up just 1.1 percent year over year, with a separate local tracking measure putting the Q2 2026 median closer to $702,500, essentially flat from the first quarter. That is a market where a primary-residence buyer stands a reasonable chance of living in the home full time and eventually enrolling in the homestead track.
Big Sky is a different animal. As of January 2026 data, the typical home value there ran close to $1.8 million, with active listings carrying a median list price of $2.4 million, and the local affordability ratio, a measure of home price relative to local income, stood at 17.2, the highest of any community in the state. Whitefish came in at 11.7 and Bozeman at 8.8 on the same scale. In plain terms, Big Sky is built almost entirely around second-home and investment ownership, which means a much larger share of its housing stock is likely to land on the flat 1.9 percent default track by design, not by exception.
For a Texas family comparing these towns, the entry price on a listing sheet tells only part of the story. A cheaper-looking home in a market saturated with second-home inventory can carry a higher effective tax rate than a pricier home in a town where most owners live there full time.
Local Governments Are Managing Their Side of It, Separately
The state sets the homestead-versus-default classification, but cities still control their own piece of the bill through mill levies. Whitefish offers a useful example of how that plays out. According to Mayor John Muhlfeld, writing in the Flathead Beacon, the city council voted 4-3 to draw down its carry-forward mill reserve from 27.82 mills at the end of fiscal year 2026 to 11.59 mills by the end of fiscal year 2027, a deliberate move to avoid future tax spikes rather than lean on reserves. The practical result: a $1,000,000 primary residence in Whitefish will see less than a 6.6 percent increase in the city portion of its tax bill, roughly $53 a year.
That cushion applies to the city's own mills on a primary residence. It does not change the state-level classification. A second home in the same city still lands on the flat 1.9 percent default track regardless of how carefully the local council manages its budget. City-level decisions can soften the increase for residents. They cannot move a property from one track to the other.
What to Actually Check Before Writing an Offer
For a DFW family weighing a Montana purchase against options like a lake property in Southeastern Oklahoma or a beach house on 30A, the Montana calculation now carries one more moving part than either of those markets. Before making an offer, it is worth confirming:
- Whether the seller is currently enrolled on the homestead track, and whether that status will carry over or reset with new ownership
- What the property's current tax bill looks like under each track, not just the most recent bill on file
- Whether the closing date will fall inside or outside the next enrollment window, since that determines the classification for the first full tax cycle under new ownership
- Whether the plan for the home (full-time residence, long-term lease, or short-term rental) actually qualifies for the lower track under the rules as currently written
A Few Questions Worth Asking Directly
Does the flat 1.9 percent rate apply to the whole home value, or just the amount above a certain threshold? For non-homestead properties, it applies to the entire assessed value from the first dollar. Only the homestead track uses the tiered, bracket-based structure.
If I buy this fall and move in right away, am I stuck paying the second-home rate for a full year? Based on the enrollment rules as written, yes, if the purchase closes after the March 1 window closes for that tax year. The next opportunity to enroll comes with the following December's filing period.
Could this all change again? Possibly. With litigation still active in Gallatin County District Court, the structure described here reflects the rules as they currently stand, and any buyer running long-term numbers should build in room for the framework to shift.
A Montana second home still delivers what draws Texas families there in the first place: real mountains, real rivers, and a pace of life that a spreadsheet cannot capture. But the spreadsheet still matters, and this year it has a new variable in it. Families comparing Montana against other second-home markets deserve a clear-eyed look at what a property actually costs to hold, not just what it costs to buy.
If your family is weighing a mountain property against other second-home options, or trying to figure out how a cross-market purchase like this fits alongside a primary residence in Southlake or Westlake, the team at Selling Southlake can help you think through the full picture before you write an offer.