Carter County, MT Property Tax: $782/yr (2026)
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The effective property tax rate in Carter County is 0.44% of assessed home value. On a home at the county median value of $176,600, that works out to about $777 per year, or $65 per month. Carter County is located in southeastern Montana, and is home to approximately 1,361 residents.
About Carter County
Carter County covers approximately 3,340.5 square miles in Montana. The county is home to about 1,361 residents living in roughly 799 housing units, of which 46.2% are owner-occupied. The median household income is $52,171, and the median home was built in 1973.
Carter County borders Custer County, Fallon County, Powder River County, Butte County, Harding County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in Montana
Property taxes in Montana are administered at the county level. Each county sets a millage rate applied to the assessed value of real property — the effective rate above accounts for any partial assessments and exemptions already built into the local tax base. Assessed value can differ meaningfully from current market value depending on how often the county reassesses and what fraction of market value it uses.
Most counties in Montana offer exemptions that reduce the taxable assessed value: homestead exemptions for primary residences, senior exemptions, disability exemptions, and veteran exemptions are common. These reduce your effective rate below the county-wide average shown here. Contact the Carter County Assessor's office to learn which exemptions apply to your property and when to file.
Carter County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| Carter County, MT | 0.44% | $176,600 | $777 |
| Montana state average | 0.77% | — | $1,360* |
| Custer County | 1.10% | $204,200 | $2,242 |
| Fallon County | 0.57% | $237,000 | $1,359 |
| Powder River County | 0.83% | $149,400 | $1,237 |
| Butte County | 1.06% | $207,700 | $2,197 |
| Harding County | 0.93% | $156,400 | $1,460 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at Carter County's median home value of $176,600. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does Carter County's property tax rate compare to the rest of Montana?
At 0.44%, Carter County is lower than the Montana state average of 0.77%. On a home at the county median of $176,600, that means about $777 per year — versus $1,360 at the state average rate, a difference of $583 per year. Compared to the national average of 1.10%, Carter County is below average.
What's a typical annual property tax bill in Carter County?
For a home at the county median value of $176,600, the annual property tax in Carter County is approximately $777 — or about $65 per month. For a home worth $264,900, expect around $1,166 per year. For a $353,200 home, approximately $1,554 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a Carter County property tax assessment?
Property assessment appeals in Carter County are handled by the Carter County Assessor's office. Most jurisdictions require filing within 30–90 days of receiving your assessment notice — confirm the specific deadline with the assessor's office before submitting, as deadlines and procedures vary by county. A successful appeal can reduce your assessed value and lower your tax bill for the current and future tax years.
What exemptions are available in Carter County?
Montana counties commonly offer homestead exemptions for owner-occupied primary residences, senior citizen exemptions for qualifying homeowners aged 65 and older, exemptions for disabled residents, and veterans' exemptions. Each exemption reduces your assessed taxable value, which in turn reduces your effective tax rate below the county-wide 0.44% shown here. Contact the Carter County Assessor's office to confirm which exemptions are available and the application deadlines.
Data sources: US Census Bureau ACS 2023 5-Year Estimates, US Census Gazetteer (2024), County Adjacency File