Same House, Two Tax Bills: How Montana's 2026 Rates Split Polson Owners by Use
Montana's county treasurers were expected to mail 2026 property tax bills around Oct. 31, and the first half is due Nov. 30. Picture two of those bills going to two identical houses on the same Polson street. Both houses have the same square footage, the same assessed value and the same mill levies. One bill can still be more than double the other, because the owners use their houses differently.
This matters if you're comparing homes from out of state. The seller's tax bill in a listing packet shows how the seller uses the house. Your bill will depend on how you use it.
Under the Montana Department of Revenue's 2026 tax structure, primary residences and qualifying long-term rentals get a tiered rate. Each slice of market value is taxed at its own rate:
Second homes, short-term rentals such as VRBOs and Airbnbs, and vacant residential lots pay a flat 1.90% on the full value.
The lower rate depends on who owns the house and how it's used. According to DOR's homestead and long-term rental rules, a homestead has to be the owner's principal residence for at least seven months of the year, and the taxes have to be current. An individual, a couple or a grantor revocable trust can hold a homestead. An LLC, corporation, partnership or irrevocable trust cannot. So the way you title a Polson purchase helps decide which rate applies to it.
The Northwest Montana Association of Realtors' September 2026 market update put the single-family median sale price at $712,000 for Flathead, Lake and Lincoln counties combined. That's a regional figure, not a Polson-only one, but it's a realistic test case. Applying DOR's tax year 2026 rates at that price and at a few other points shows how the gap behaves:
| Market value | Taxable value as homestead | Taxable value as second home | Second home vs. homestead |
|---|---|---|---|
| $378,000 | about $2,873 | about $7,182 | about 2.5 times |
| $712,000 | about $5,879 | about $13,528 | about 2.3 times |
| $1,512,000 | about $14,591 | about $28,728 | about 2.0 times |
| Above $1,512,000 | Every added dollar taxed at 1.90% | Every added dollar taxed at 1.90% | Gap holds at about $14,100 |
Taxable value isn't the bill. Local mill levies get applied to it, and the same mills apply whether the owner lives there or visits for a month each summer. The City of Polson's levy alone is 125.73 mills for fiscal 2026-27: 97.01 general, 11.70 permissive medical and 17.02 municipal services. At the $712,000 example, the city's mills by themselves turn the difference in taxable value into roughly $960 a year. County, school and state levies are added on top of that.
The table also shows how the gap is built. The homestead discount works like a fixed-size benefit. Once a home's value passes about $1.5 million, both versions pay 1.90% on every extra dollar, and the gap in taxable value stops growing. For a mid-priced in-town Polson home, the owner's use roughly doubles the taxable value. For a $3 million lakefront estate, the discount is the same size, so it's a much smaller share of the total. Lakefront owners who move here full time get less proportional relief than they might expect.
The state expected a narrower impact. As the Daily Montanan reported in June, Department of Revenue estimates predicted that 895 residential taxpayers in Lake County would see increases under the 2025 rewrite. In fact, 3,907 did, and the median increase was 33%.
Sen. Greg Hertz, R-Polson, has tied that outcome to "land-rich" properties: modest houses on valuable ground, which describes a lot of Flathead Lake shoreline. He told the Flathead Beacon that a tax cut for some owners has to be paid for by others in the same county:
"I think a lot of people who received tax reductions don't quite understand who paid for those."
That same Beacon report, which covered tax year 2025 bills, found that Flathead County residences valued above $1.25 million saw average increases ranging from 7.7% to 788.9%. Rep. Tracy Sharp, R-Polson, told the paper he regretted his vote for SB 542 because of how it affected constituents in Polson and Bigfork.
The county's own estimates point the same way. In a September presentation reported by Citizen Portal, Lake County staff estimated that a $100,000 house would save about $14.61 on the county portion of its bill, and noted that vacation and second homes face the top 1.9% rate. Commissioners also cautioned that school and other district levies can cancel out county-only savings.
For buyers who plan to rent, the type of rental decides the rate. A long-term rental qualifies for the tiered rate if it's rented to tenants for 28 days or more at a time, for at least seven months a year, as the tenant's residence. Unlike a homestead, it can be owned by an LLC, corporation or irrevocable trust. A short-term vacation rental pays the flat 1.90%.
Inside city limits, short-term rentals now have a local requirement as well. The Daily Inter Lake reported that the Polson City Commission approved the second reading of an annual short-term rental verification permit at its Sept. 21 meeting. The permit focuses on public health, life safety, emergency contact information and tracking. The fee is $30 for now, and city officials said it could rise later. A Polson host who spoke during public comment said she already complies with county and state requirements and supports the city permit.
So a Polson vacation rental now carries a city permit and the highest residential tax rate. A long-term rental in the same building carries the tiered rate.
The tiered structure is in effect now, but it's being challenged. Hertz, Sen. Tom McGillvray and former Sen. Keith Regier filed a lawsuit in January arguing that SB 542 violated the Montana Constitution's single-subject rule. They filed a second suit on Oct. 13 arguing that charging different rates on property in the same class violates equal protection, as the Flathead Beacon reported. Oral arguments in the first case were held in Bozeman on Oct. 21. KTVH reported that Judge Andrew Bruener gave the parties until Nov. 13 to submit proposed orders.
The plaintiffs' attorney, Matthew Monforton, told the Daily Montanan that the case looks forward and that "there's going to be no clawback" of benefits already received. Rep. Llew Jones, who pushed the 2025 relief bills through, said the 2027 Legislature will work on fixes for the owners who were left out. If you're buying this winter, the 2026 rates are the ones in force, but they could change through the court cases or the 2027 session.
This post is general information, not legal, tax or financial advice. Before you rely on any of these rules for your own purchase, confirm your situation with a tax professional or the Department of Revenue.
When we look at Polson homes together, I'll show you the seller's bill and also estimate what the same house would carry based on how you plan to use it, whether as a full-time home, a summer place or a rental. If you'd like that comparison before you write an offer, Dalon Pobran is ready to go through the numbers with you. Let's Connect.
Whether you are a first-time buyer, a seasoned investor, or somewhere in between, I bring the Flathead Lake Area market knowledge and personal attention that make all the difference.
