Your taxable value went up. Here is what actually changed.
If your Montana taxable value jumped for 2026 — for a lot of people it roughly two-and-a-half times — the most likely explanation is not an error, not your market value, and not your county. It is a rate change, and there is a form behind it.
The short version
HB 231 (2025) made Montana’s reduced property tax rates opt-in. In 2025 the 0.76% rate applied to residential property generally. For 2026 it applies only if you have filed a homestead or long-term rental claim. Everything else defaults to 1.9%.
0.76% to 1.9% is exactly 2.5×. If your taxable value roughly two-and-a-half-timed on an unchanged market value, that is the whole story.
You did not lose an exemption
This is the part most coverage gets backwards. People assume they had something and it lapsed. They did not. In 2025 that 0.76% was simply the general residential rate — it applied to second homes, cabins and bare lots alike, and bare land can never qualify for a homestead.
So there is no reinstatement to argue for and no administrative mistake to point at. What changed is that an application which was never previously required is now the only thing standing between your parcel and the 1.9% default. That is annoying, but it is also fixable — going forward.
What you can still do
If you live there — the homestead rate
Your principal residence, occupied at least 7 months a year, one per owner, owned in your individual name(s) or a grantor revocable trust, and current on taxes. An LLC or corporation cannot hold a homestead — that is a structural floor, not a filing oversight.
If you rent it out — the long-term rental rate
Rented in periods of 28 days or more, for at least 7 months of the year you are claiming. The 28-day test is what disqualifies short-term rentals: an Airbnb that turns over weekly fails even with a full calendar. Unlike the homestead, an entity-owned property can claim this one.
Worth knowing because it is widely misreported: this claim buys the same graduated bands as the homestead, starting at 0.76% — not a flat 1.1%. On a house below $386,000 it restores the old rate exactly.
If it is bare land — nothing, and that is the honest answer
Both reduced rates require a dwelling. MCA 15-6-402(2)(a) defines a long-term rental as a dwelling unit, trailer, manufactured or mobile home; the homestead rate requires you to live there. A vacant lot qualifies for neither, in this year or any future year— and it cannot be attached to a neighbouring parcel’s claim, because the same section excludes “any contiguous or adjacent parcels.”
One exception worth checking: a manufactured or mobile home is often assessed as its own record, so the land can read as vacant while a dwelling genuinely sits on it. Mobile-home owners have been the group most often caught out by the opt-in change.
If it is a second home or cabin — you have four options
Pay the 1.9%; convert it to a qualifying long-term rental; move in for 7+ months a year and make it your principal residence; or sell. There is no relief program for a second home as such. The 7-month rental test does leave five months free, so an off-season lease can qualify while preserving the season you actually want — whether that works depends entirely on your local rental market.
If it is commercial — there is no election
No homestead, no rental claim, no PTAP — every relief program in Title 15 is residential. Commercial sits at 1.5% below $2,274,000 (six times the $379,000 median), with the excess above that at 1.9%. Two things only can be contested: the market value and the classification.
And note the direction is not uniform. HB 231 pivoted commercial around roughly $505,000 of market value — smaller parcels went up, larger ones came down. A single headline percentage will be wrong for half a mixed portfolio.
The deadline, and what happens if you miss it
The window for the 2027 tax year is open now and closes March 1, 2027. The statute sets it at December 1, but the department opened this one early — so calendaring from the code alone leaves you late by default. Apply at homestead.mt.gov, which is also where you check whether a claim is already on file.
- Nothing changes 2026. That window closed March 1, 2026. The bill arriving this fall carries the default rate, and the letter the department sent in September is explicitly not appealable.
- A late application is not forfeited — postmarked after March 1 it applies to the following tax year instead. It costs you a year, not the program.
- The saving lands one bill later. Claim by March 1, 2027 and it reduces the 2027taxable value, which shows up on the treasurer’s bill in the fall of 2027.
- Once granted it rolls over — until ownership or use changes. A transfer into an entity or an inheritance ends it silently, and the first sign is a taxable value that doubles.
What is not worth fighting
Of the five steps between a building and a bill, only two can ever be contested:
| Market value | Contestable — but against the valuation date, not today’s market |
| Classification | Contestable — and a genuine error is correctable any time under MCA 15-8-601, with no window to miss |
| The rate | Statutory. Not appealable. |
| The mills | Set by jurisdictions and voters. Never appealable. |
So if your value is unchanged and only the rate moved, an appeal has nothing to bite on — the claim form is the entire remedy. If the value also moved, that is a different conversation, and it runs on a 30-day clock from the date on the notice, not the date you opened it.
“Won’t the mills just come down?” — only partly
There is a revenue cap (MCA 15-10-420) that forces a jurisdiction to lower its mills when values rise. But subsection (5) exempts the school levies— the statewide “95 mills,” the 6-mill university levy, and every local school district levy. Those are set in mills, not in revenue, so when the taxable base grows they simply collect more.
Since school levies are commonly the largest single line on a Montana bill, the float-down applies to the minority of it. When your bill arrives, split the mill breakdown into capped (county, city) and uncapped (state, university, schools) before drawing any conclusion.
Related
- The homestead reduced rate: who qualifies, and how to claim it
The Montana homestead reduced tax rate takes a principal residence off the 1.9% default and onto graduated bands starting at 0.76%. The four tests, the ownership rule that disqualifies LLCs outright, the real application window, and what happens if you miss it.
- How a Montana taxable value is actually built
Market value, classification, statutory rate, mills, bill. Five steps from a building to a tax bill — and only the first two can ever be contested. Worked through with the graduated bands, and how to tell a rate change from a value change.
- Can you still fix 2026?
The 2026 application window closed March 1 — but an owner who was eligible for the homestead rate and never applied can recover one year by informal appeal to the Department of Revenue, by May 31, 2027. There is no long-term-rental equivalent.
Where your own parcel stands
The rate check is free and takes about ten seconds — look up any Montana property and see which rate applies, which reduced rate it could qualify for, and the gap between them. No email required. If you would rather someone went through the whole notice, that is what we do.
Rates, deadlines and statutory citations verified against MCA Title 15 as of September 17, 2026. The median residential value ($386,000) and median commercial value ($379,000) are recalculated every two years with reappraisal — the next reset is in 2027. Up The Creek Research LLC is a public-records research firm, not a law firm, an accounting firm or an appraisal firm; this page explains what the statute provides and is not advice about your particular situation. See our Disclaimer & Terms.