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Montana Property Tax Calculator

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Overview of Montana Taxes

Montana has relatively low taxes on residential real estate. The state’s average effective property tax rate is 0.74%, lower than the national average of 0.99%.

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  • About This Answer

    To calculate the exact amount of property tax you will owe requires your property's assessed value and the property tax rates based on your property's address. Please note that we can only estimate your property tax based on median property taxes in your area. There are typically multiple rates in a given area, because your state, county, local schools and emergency responders each receive funding partly through these taxes. In our calculator, we take your home value and multiply that by your county's effective property tax rate. This is equal to the median property tax paid as a percentage of the median home value in your county. more
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Montana Property Taxes

Photo credit: © Moorman

Buying a house in Billings? Missoula? Helena? If so, it’s a good idea to get familiar with the Montana property tax system. Montana has relatively low taxes on residential real estate. The state’s average effective property tax rate is 0.74%, well below the U.S. average, which currently stands at 0.99%.

In part, rates in Montana are low because the system is structured to reduce the burden on homeowners. The taxable value for an owner-occupied residential property is only a small percentage of the property’s market value. Commercial and business property also receive big exemptions.

If you are buying a house in Montana, it’s also a good idea to familiarize yourself with the details of getting mortgage in the Big Sky State. You can find this information, along with details about rates on our Montana mortgage guide.

A financial advisor can help you understand how homeownership fits into your overall financial goals. SmartAsset’s free tool matches you with up to three vetted financial advisors who serve your area, and you can interview your advisor matches at no cost to decide which one is right for you. If you’re ready to find an advisor who can help you achieve your financial goals, get started now.

How Montana Property Taxes Are Calculated

Property taxes in Montana are based on your total tax rate and the taxable value of your home. Taxable value is based on your home’s market value, but the state of Montana calculates it using a somewhat complicated formula.

First, residential property is reappraised by state assessors once every two years. (Reappraisal occurred every six years prior to 2015). The goal of the reappraisal is to match the current market value for each property. If the reappraised value is greater than the previous value, the difference is phased in over the course of the two-year reappraisal cycle. That means there is a slight lag between your current market value and the value on which your taxes are based.

Montana Property Tax Rates

Cities, counties and school districts largely determine tax rates in Montana. The state also collects statewide taxes to support education. Tax rates are expressed in mills or millage rates. A mill equals $1 for every $1,000 of taxable value, while a millage rate is a mill expressed as a decimal. For example, 1 mill is equivalent to a millage rate of 0.001.

For example, the statewide taxes are 95 mills for public schools and another 6 mills for higher education.

While your tax bill will reflect a millage rate, a good way of comparing tax rates from one area to the next is through effective tax rates. This is equal to annual property taxes paid as a percentage of home value. The table below shows average effective property tax rates for every county in Montana, along with their median home values and median annual property tax payments.

CountyMedian Home ValueMedian Annual Property Tax PaymentAverage Effective Property Tax Rate
Big Horn$150,300$1,0810.72%
Deer Lodge$129,100$1,4091.09%
Golden Valley$107,600$750.000.70%
Judith Basin$154,200$7600.49%
Lewis and Clark$263,900$2,6711.01%
Powder River$135,900$1,0590.78%
Silver Bow$155,300$1,7961.16%
Sweet Grass$243,300$1,4290.59%

You can also learn more about your mortgage payments with our mortgage loan calculator.

Yellowstone County

Yellowstone County is located in central Montana and contains the city of Billings. Tax rates in Yellowstone County are near the state average, as its average effective tax rate is 1.04%. However, it has a moderately high $238,700 median home value, which causes its $2,492 median annual property tax payment to rank as fifth-highest in the state.

Missoula County

The median annual property tax payment in Missoula County is $3,760, the highest in the state. The city of Missoula has some of the highest taxes of Montana’s largest cities, with total mill levies of about 283 mills. Missoula County's average effective tax rate is 1.24%.

Flathead County

Located in northwest Montana along the western boundary of Glacier National Park, Flathead County has some truly beautiful areas. It also has relatively modest property taxes. The average effective property tax rate in the county is 0.91%, much higher than the state average (0.74%).

Gallatin County

© Bratslavsky

Gallatin County stretches from the tristate border with Idaho and Wyoming up to the city of Bozeman. It contains parts of the Gallatin National Forest and Yellowstone National Park.

The median home value in Gallatin County is $388,00. That makes homes here the most valuable of Montana's 56 total counties.

So while Gallatin County’s property tax rates are slightly lower than the state average, homeowners in the county still pay among the highest property taxes in Montana in dollar terms. The typical Gallatin County resident has a property tax bill of $3,465, placing the county as the second-most expensive behind only Missoula County.

Cascade County

The average effective property tax rate in Cascade County is 1.16%, 5th-highest in the state. At that rate, the annual property taxes on a home worth $171,700 (the median home value in the county) would be $1,991.

Lewis and Clark County

The sixth-most populous county in Montana, Lewis and Clark County has property tax rates higher than the state average. The county’s average effective property tax rate is 1.01%, compared to the 0.74% state average.

Ravalli County

If you’re buying a home in Montana, but don’t like paying property taxes, Ravalli County may be the place for you. The county’s 0.59% average effective property tax rate ranks as the 3rd-lowest in the state.

Silver Bow County

The average effective property tax rate in Silver Bow County is 1.16%, good for fifth-highest in Montana. A homeowner whose home is worth $120,000 would pay $1,392 annually at that rate.

Lake County

Situated at the southern end of Flathead Lake in northwest Montana, Lake County is the ninth-most populous county in Montana. The county’s average effective property tax rate of 0.71% is slightly lower than the  0.74% statewide average.

Lincoln County

The typical homeowner in Lincoln County pays $1,342 annually in property taxes. That's nearly $800 less than the state median of $2,390. The average effective property tax rate here is 0.68%.