Travis Bunn
Founder, AppealDesk · Published March 1, 2026
How Much Can Property Taxes Increase in Montana? 2026 Complete Guide
Updated July 2026
Quick Answer
Montana caps neither your home's assessed value nor the tax rate applied to it. Assessments track full market value, and the Montana Department of Revenue reappraises residential property statewide every 2 years. The binding limit is on the revenue side: under MCA 15-10-420, a county, city, or school district may collect the prior year's actual property tax revenue plus one-half the average rate of inflation for the prior 3 years, with newly taxable property excluded from that base and voter-approved levies allowed on top. Separately, the 2025 Legislature rewrote residential taxation itself. HB 231 and SB 542 replaced the flat residential rate with graduated rates by home value for tax year 2025, and starting in tax year 2026 they give enrolled primary residences and long-term rentals lower homestead rates while second homes and short-term rentals pay a higher flat rate.
Most homeowners never challenge their assessment, usually because nobody tells them they can or shows them how. That gap is the whole reason AppealDesk exists: see what your county has your home on record at, free, and if the number looks wrong we build the case for $49.
Does Montana Have Property Tax?
Yes. Montana has no general state sales tax, which sometimes leaves people with the impression that it is a light-tax state across the board, but property tax is the backbone of local government funding here. Counties, cities, and school districts all levy against property, and every home in the state carries a value set by the Department of Revenue. What Montana does not have is any ceiling on how fast an individual home's assessed value can climb. That single fact shapes everything else in this guide.
How Much Can Property Taxes Increase Each Year in Montana?
There is no clean percentage answer for an individual homeowner, because Montana's limit applies to governments rather than to houses. Under MCA 15-10-420, each taxing jurisdiction may collect the property tax revenue it actually collected the prior year, plus one-half the average rate of inflation over the prior 3 years. Newly taxable property, including new construction, is excluded from that base, so a county growing through new building does not have to give the growth back. Voters may also approve levies above the limit, and the statute permits those voter-approved amounts explicitly.
Work through the arithmetic and the limit looks tight. If a county collected $10 million in property taxes last year and inflation averaged 3 percent across the prior 3 years, half of that is 1.5 percent, so the levy limit allows roughly $10.15 million from the existing tax base this year. Total collections in that jurisdiction cannot balloon quietly.
The catch is that the limit governs the size of the pie, not the size of your slice. Every 2 years, when the Department of Revenue reappraises the state, homes that appreciated faster than their neighbors absorb a larger share of the same constrained levy. Your bill can climb far beyond inflation while your county stays entirely inside its revenue cap, because the increase came out of the reappraisal, not the levy.
Montana Puts No Cap on Assessed Values
Montana values property at market value with no ceiling on the year-over-year change. It is not an acquisition-value state: assessments do not reset on sale, and there is no protection tied to how long you have owned the home. The reappraisal runs on a statewide biennial cycle conducted by the Montana Department of Revenue rather than by individual county assessors, so every residential property in Montana receives a fresh market-value number on the same schedule.
That means the most consequential number on your tax bill, the assessed value, comes out of a statewide mass-appraisal model that prices thousands of homes at once. The levy limit never audits that number. The graduated and homestead rates described below are simply applied to it. If the model overshoots on your particular house, every downstream rate benefit multiplies the error instead of correcting it.
Caps and rate limits only control how fast your bill can grow. Nothing in them checks whether the number underneath is right. Assessors in Montana set values with mass-appraisal models that price thousands of homes at once, and nobody reviews yours unless you challenge it.
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What Is Montana's Property Tax Rate in 2026?
This is the part of Montana's system that changed most recently, and any 2026 guide that skips it is out of date. Residential property in Montana is Class 4 property. In 2025 the Legislature passed HB 231 and SB 542, which retired the flat 1.35 percent residential rate and replaced it with rates that step up with home value. These are the Class 4 residential rates for tax year 2025:
| Market Value Tier | Tax Year 2025 Rate |
|---|---|
| First $400,000 | 0.76% |
| $400,000 to $1.5 million | 1.10% |
| Above $1.5 million | 2.20% |
Because the tiers are graduated, a $300,000 home falls entirely inside the first bracket and carries the 0.76 percent rate on its whole value. A $600,000 home takes 0.76 percent on its first $400,000 and 1.10 percent on the remaining $200,000, so its blended rate lands between the two published numbers rather than at the higher one. That structure is deliberate: it concentrates the heavier rates on the top of the market.
Beginning with tax year 2026, the system splits again along use. Enrolled primary residences and long-term rentals qualify for homestead rates, graduated from 0.76 percent at the bottom up to 1.90 percent at the top tier, which works out to roughly an 18 percent cut for most qualifying primary residences. Second homes and short-term rentals instead pay a flat 1.90 percent. Enrollment runs through Homestead.MT.gov, and if the property is where you actually live, enrolling is the highest-leverage thing you can do to your rate.
Keep in mind that these statutory rates are one input to the bill. The other input is the set of mills your local jurisdictions levy within the MCA 15-10-420 limit, which varies county to county and district to district. Your classification and appraisal notice from the Department of Revenue is the authoritative statement of how your property is being classified and valued, so read it against the tiers above rather than assuming.
What Changed in 2025: HB 231, SB 542, and the $400 Rebate
The 2025 reform did more than reshuffle rates. HB 231 also authorized a one-time property tax rebate of up to $400 on a Montana homeowner's primary residence for 2025. Taken together, the graduated tiers, the coming homestead rates, and the rebate all push in the same direction: move residential burden toward high-value properties, second homes, and short-term rentals, and away from owner-occupied primary residences. If you owned and occupied a Montana home in 2025 and have not looked into the rebate, confirm your eligibility with the Department of Revenue rather than assuming it arrived automatically.
It is worth being precise about what this reform did not do. It did not cap assessment growth, it did not slow the biennial reappraisal, and it did not create any protection based on how long you have owned your home or whether it recently changed hands. Montana still has no transfer-triggered reassessment and no long-term-owner freeze. The relief is delivered through rates and through the levy limit, and nothing else.
Will Property Taxes Go Down in 2026?
For a lot of Montana homeowners, yes, at least on the rate side. The homestead rates taking effect for tax year 2026 amount to roughly an 18 percent cut for most qualifying primary residences that enroll, and long-term rentals receive the same graduated treatment. The other side of the ledger is that second homes and short-term rentals move to a flat 1.90 percent, so owners of those properties should generally expect increases rather than relief.
Two cautions before you pencil in a smaller bill. First, the homestead rate is not automatic. It applies to enrolled properties, so an eligible homeowner who never enrolls through Homestead.MT.gov can watch the cut pass by. Second, a lower rate applied to a higher value can still produce a bigger bill. If reappraisal moves a home from $400,000 to $500,000, an 18 percent rate cut can be swallowed whole by a 25 percent value increase. The rate reform never examines whether that new value is accurate.
What Is the Average Property Tax in Montana?
There is no single statewide average worth quoting with confidence right now, and any figure circulating online for Montana deserves a hard look at its date. Residential rates were restructured twice inside two years, which makes averages computed from older bills stale on arrival. Bills also swing widely by county because local mill levies differ, and from 2026 forward two identical houses on the same street can carry different rates depending on whether each is an enrolled primary residence or a second home.
The more useful number is your own effective property tax rate, and you can compute it in about a minute. Divide your most recent annual tax bill by the market value shown on your Department of Revenue classification and appraisal notice. A $4,000 bill on a $400,000 valuation is a 1.0 percent effective rate. That figure captures your classification, your tier, and your local mills all at once, and it gives you a clean baseline to compare against after the 2026 homestead rates land. If your effective rate looks noticeably higher than neighbors with similar homes, the likeliest explanation is the valuation, not the law.
What you can do about it
How to Challenge Your Montana Assessment
Because Montana caps nothing on the value side, the appeal is the only mechanism in the system that reviews whether your individual number is right, and it runs on a short clock. From the date printed on your classification and appraisal notice you have 30 days to act, with two doors open. You can file Form AB-26, the Request for Informal Classification and Appraisal Review, with the Montana Department of Revenue, or you can appeal directly to your County Tax Appeal Board. If you take the AB-26 route and disagree with the result, you have 30 days from that decision to appeal to the County Tax Appeal Board, and county board decisions can be carried further to the Montana Tax Appeal Board.
The Department of Revenue does accept late informal-review requests, for the current cycle until June 1, 2026, but waiting has a real price: an adjustment from a late request applies only to the later tax year, not the one you were already billed for. The 30-day window from your notice date is the one that protects the current year. Treat the notice as a deadline document the day it lands in your mailbox, and if the value looks wrong, gather comparable sales before the clock runs out. County procedures and evidence expectations vary, so confirm the specifics with your county assessor's office or the Department of Revenue.
A real AppealDesk order, Denver County, Colorado
In May 2026, a homeowner in Denver County, Colorado ran the check. The county had their home on record at $2,387,100, while recorded sales of comparable homes supported about $1,600,198: an over-assessment of $786,902, worth roughly $4,244 per year if corrected. Their packet laid out the comparable sales, the forms, and the filing steps. Nobody at the county was ever going to run that check for them.
Growth limits only help if the number they grow from is fair. If your assessment jumped after a purchase, new construction, or a revaluation, that new number is the one nobody has reviewed. Checking it is free and takes about a minute.
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Frequently Asked Questions
How much can my Montana property taxes increase this year?
There is no per-home limit. Your assessed value can rise as far as the market moved since the last biennial reappraisal, and your share of local levies rises with it. The MCA 15-10-420 levy limit holds each jurisdiction's total collections to the prior year's revenue plus half the 3-year average inflation rate, but that constrains the total collected, not your individual bill.
How often is my property reassessed in Montana?
Every 2 years, and unusually, the reappraisal is conducted statewide by the Montana Department of Revenue rather than by county assessors. Each cycle you receive a classification and appraisal notice, and the date on that notice starts your 30-day appeal window.
Why doesn't Montana cap assessment increases like other states?
Montana has chosen to keep assessments tied to current market value and to deliver relief through the rate structure and the levy limit instead. Since the 2025 reform that relief is targeted rather than universal: graduated rates favor moderately priced homes, and from tax year 2026 enrolled primary residences and long-term rentals pay meaningfully lower homestead rates than second homes and short-term rentals, which pay a flat 1.90 percent.
Do I need to do anything to get the 2026 homestead rate?
Yes. The homestead rates apply to enrolled primary residences and long-term rentals, and enrollment runs through Homestead.MT.gov. If you qualify and never enroll, you can miss a rate reduction worth roughly 18 percent for most primary residences. Enrollment is a separate action from filing an appeal, and doing one does not accomplish the other.
What is the best way to control my property tax increases?
Check your assessed value against real sales of comparable homes every reappraisal cycle, and file the AB-26 or a County Tax Appeal Board appeal within 30 days of your notice when the number looks high. Enroll your primary residence for the homestead rate, confirm you received the 2025 rebate if you were eligible, and pay attention when local jurisdictions ask voters to approve levies above the limit, because those votes are the other lever that moves bills.
Related Resources
If your Montana assessment looks out of line, start with our step-by-step guide on how to appeal property taxes in Montana. If you are weighing whether the effort pays off, read is it worth appealing property taxes, and when you are ready to build your case, see what evidence you need for an appeal.
This article provides general information about Montana property tax laws as of July 2026. Tax laws change frequently, and local rules vary. Consult your county assessor, the Montana Department of Revenue, or a tax professional for advice specific to your situation.