Montana Mortgage Calculator

Calculate your exact monthly payment (PITI) for Montana real estate. This tool automatically applies the state's new 2026 tiered property tax framework and adjusts for secondary home penalties.

1. Property Details

Home Price $ Enter a valid home price

Residency Status (MT Tax Laws)

Secondary homes are heavily penalized with a flat 1.90% tax rate.

2. Financing

Down Payment %

Less than 20% down triggers Private Mortgage Insurance (PMI). Enter valid percentage

Interest Rate %

Loan Term

3. Insurance & Extras

Homeowners Insurance $/yr High wildfire risk zones (Flathead/Missoula) will be significantly higher.

HOA Dues $/mo

Calculation Results

Estimated Monthly Payment (PITI)

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Includes principal, interest, taxes, insurance, and applicable PMI/HOA.

Understanding Montana's unique real estate quirks

The 2026 Tiered Property Tax System

Montana overhauled its residential property tax codes. If the home is your primary residence, you benefit from a highly protective tiered structure. The Montana Department of Revenue assesses only 0.76% on the first $378,000 of value. The rate slowly steps up to 0.90%, then 1.10%, and only hits the maximum 1.90% on home values exceeding $1.51 million[cite: 1].

The Secondary Home Penalty

Out-of-state buyers purchasing vacation homes or short-term rentals (Airbnbs) do not get the tiered protection. Montana taxes secondary residences at a flat 1.90% from the very first dollar[cite: 1]. On a median-priced $530,000 home, an out-of-state investor will pay $10,070 per year in property taxes, while a local resident will pay only $4,240.

Zero Real Estate Transfer Tax

Montana is one of the few remaining states that does not impose a state-level real estate transfer tax. This means that when a property changes hands, neither the buyer nor the seller has to pay a percentage of the sale price to the government, making your final closing costs significantly cheaper than in states like Washington or Colorado.

Non-Disclosure State Laws

Montana is a strict non-disclosure state, meaning property sale prices are not public record. You cannot simply look up what your neighbor paid for their house on Zillow. Only licensed real estate agents with MLS access and the Department of Revenue know the true sale prices. This actively prevents the county from arbitrarily raising your property taxes simply because the house next door sold for an inflated premium.

Montana 2026 Property Tax Brackets[cite: 1]

Home Value Bracket	Primary Residence Rate	Second Home Rate
$0 to $378,000	0.76%	1.90%
$378,001 to $756,000	0.90%	1.90%
$756,001 to $1,511,999	1.10%	1.90%
$1,512,000+	1.90%	1.90%

Frequently asked questions

What is the Montana Board of Housing (MBOH)?

The MBOH provides specialized loan programs and down payment assistance (DPA) for Montana residents. Programs like the Regular Bond and Plus 0% Deferred DPA offer slightly below-market interest rates and down payment cash injections. However, these are strictly capped by income limits (usually $80,000 for a 1-2 person household) and purchase price limits.

Why are homeowners insurance rates rising in Montana?

Wildfire risk. While the statewide average for homeowners insurance is reasonable, properties situated in heavily forested WUI (Wildland-Urban Interface) zones—particularly in Flathead, Gallatin, and Missoula counties—are seeing massive premium hikes. If your desired property backs up to National Forest land, quote insurance before making an offer.

How does Private Mortgage Insurance (PMI) work?

If you put less than 20% down on a conventional loan, the lender will force you to pay a monthly PMI premium. This insurance protects the bank (not you) in case you default on the loan. PMI typically costs between 0.3% and 1.5% of your total loan amount annually, and automatically falls off once you build 20% equity in the home.

About this calculator

This tool goes beyond a generic national calculator by directly embedding the Montana Department of Revenue's current statutory tax code into the backend math[cite: 1].

The calculation engine utilizes the following logic:

Loan Amount = Home Price − (Home Price × Down Payment %)

Monthly P&I = Loan Amount × [r(1+r)^n] / [(1+r)^n - 1]
*Where r is the monthly interest rate and n is the total number of months.

Montana Primary Tax Tier 1 (Up to $378k) = Value × 0.0076[cite: 1]
Montana Primary Tax Tier 2 ($378k to $756k) = Value × 0.0090[cite: 1]
Montana Primary Tax Tier 3 ($756k to $1.51M) = Value × 0.0110[cite: 1]
Montana Primary Tax Tier 4 (Over $1.51M) = Value × 0.0190[cite: 1]

Montana Secondary Home Tax = Flat 1.90% of Total Value[cite: 1]

Methodology and sources

Montana Mortgage Calculator combines the measurements and choices entered above with the assumptions displayed on this page. Cost outputs are planning estimates rather than contractor quotes or appraisals. Labor rates, taxes, permits, access, product specifications and regional conditions can materially change an actual project cost.

Source note: This calculator is driven by standard arithmetic and the values supplied by the user. No unrelated third-party source has been added merely for authority; any benchmark assumptions used by the tool are stated in its About section.

Last reviewed: August 2026. The linked organizations provide reference material and do not endorse Efficienco or this calculator.