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Updated 2025 Tax Year

Sanders County
Property Tax Guide

Everything you need to know about property taxes in Sanders County, MT. Rates, due dates, exemptions, and how it affects your monthly payment.

10 Official Sources
8 min read
Quick Facts
Tax Rate
1.40% for homes ≤$400K, 1.89% for higher values, varies by special districts
Exemptions
5+ Available
Section 1

How Property Tax Works

Sanders County property taxes fund essential local services including schools, roads, law enforcement, fire protection, and county government operations. The property tax system in Montana operates on assessed value, which is calculated as a percentage of market value based on property classification. Sanders County has implemented recent legislative changes that provide reduced tax rates for many residential properties, with the 2025 tax rate set at 1.40% for homes valued at $400,000 or less, and 1.89% for higher-valued properties.

Property tax rates in Sanders County vary significantly by location within the county due to special taxing districts such as school districts, fire districts, cemetery districts, and other local improvement districts. These special assessments are added to the base county levy, meaning two properties of identical value in different areas of the county may have substantially different tax bills. The county encompasses multiple school districts and rural fire districts, each with their own mill levies that contribute to the total property tax burden.

Tax statements for the 2025 levy year are mailed by October 25, 2025, with the first installment due in November 2025. Property owners should verify their mailing address with the Sanders County Treasurer's office to ensure timely receipt of tax statements, as owners remain responsible for payment even if statements are not received due to address changes.

Section 2

What Makes Up Your Tax Bill

ComponentRate RangeDescriptionLevy Year
Residential Properties ($400K or less)1.40%Base rate for qualifying residential propertiesFY 2025
Residential Properties (over $400K)1.89%Standard rate for higher-value residentialFY 2025
Qualified Agricultural Land2.05%Rate for qualified agricultural propertiesFY 2025-2026
Non-Qualified Agricultural Land14.35%Rate for non-qualifying agricultural landFY 2025-2026
School District LeviesVariesAdditional mills for local school fundingFY 2025
Fire District LeviesVariesRural fire protection districtsFY 2025
Special Assessment DistrictsVariesLocal improvement districts, cemetery districtsFY 2025

Note: These rates represent county-wide averages. Actual tax rates vary significantly by specific location within Sanders County due to overlapping special taxing districts. Properties in incorporated areas may have additional municipal taxes. The 2026 levy year will implement further rate changes, with properties valued at less than 6 times the county median receiving a 1.50% rate, while properties at or above 6 times median will be taxed at 1.90%.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Sanders County, property taxes are due in two installments:

Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental property taxes in Sanders County are triggered by specific events that change property ownership or value during the tax year. The most common triggers include change of ownership through sale or transfer, completion of new construction or major improvements, and correction of assessment errors discovered by the county assessor. When these events occur, the county assessor issues a supplemental assessment to capture the difference between the previous assessment and the new assessed value.

Supplemental taxes are calculated by determining the difference between the old and new assessed values, then applying the current tax rate to this difference. The supplemental tax is prorated based on the number of months remaining in the fiscal year from the date the change became effective. For example, if a property sells in January and the new assessment is higher, the buyer would be responsible for supplemental taxes covering January through December of that tax year.

Example: A property assessed at $250,000 sells in March for $450,000. The county reassesses the property at $400,000 (market value adjusted for assessment ratio). The supplemental tax would be calculated on the $150,000 increase in assessed value, multiplied by the applicable tax rate (1.40% for this value range), and prorated for 10 months (March-December), resulting in approximately $1,750 in supplemental taxes due within 30 days of the supplemental bill date.

Example Calculation

Property Value: $300,000

  • Market Value: $300,000
  • Assessed Value: $300,000 (residential assessment ratio)
  • Applicable Tax Rate: 1.40% (under $400K threshold)
  • Gross Annual Tax: $4,200
  • Less: Homestead Credit: -$420 (example 10% credit, requires application)
  • Net Annual Tax: $3,780
  • Monthly Escrow: $315

Property Value: $600,000

  • Market Value: $600,000
  • Assessed Value: $600,000 (residential assessment ratio)
  • Applicable Tax Rate: 1.89% (over $400K threshold)
  • Gross Annual Tax: $11,340
  • Less: Senior/Disability Credit: -$500 (if applicable, requires application)
  • Net Annual Tax: $10,840
  • Monthly Escrow: $903

Property Value: $1,000,000

  • Market Value: $1,000,000
  • Assessed Value: $1,000,000 (residential assessment ratio)
  • Applicable Tax Rate: 1.89% (over $400K threshold)
  • Gross Annual Tax: $18,900
  • Less: Veteran's Disability Credit: -$200 (if applicable, requires application)
  • Net Annual Tax: $18,700
  • Monthly Escrow: $1,558

Important Notes: All tax credits shown require separate applications filed with Sanders County by specified deadlines. The Homestead Credit limits annual assessment increases rather than providing a flat reduction. Actual taxes may vary based on special district assessments in your specific location within the county.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Sanders County require property tax escrow accounts for loans with less than 20% down payment, though borrowers may request escrow even with higher equity positions. Lenders collect monthly escrow payments equal to 1/12th of the annual property tax bill, plus amounts for homeowner's insurance and other required coverages. The escrow account serves as a buffer to ensure timely tax payments and protect the lender's security interest in the property.

Sanders County tax statements are mailed by October 25th each year, with the first installment typically due in November. Lenders usually pay the first installment directly from escrow funds in November, with subsequent monthly payments continuing throughout the tax year. Property owners should provide their mortgage servicer with copies of tax bills promptly to ensure accurate escrow calculations and avoid payment delays that could result in penalties.

Annual escrow analysis statements reconcile the account balance with actual tax bills and insurance premiums. If property taxes increase due to reassessment or new special district levies, monthly escrow payments will be adjusted accordingly. Property owners can verify that their lender has made tax payments by checking with the Sanders County Treasurer's office online or by phone, as the property owner remains ultimately responsible for ensuring taxes are paid even when using an escrow account.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are property taxes due in Sanders County for the 2025 tax year? A: Tax statements are mailed by October 25, 2025, with the first installment due in November 2025. Subsequent payments are due monthly. Electronic payment is required for amounts of $50,000 or more beginning in 2026.

Q: What tax credits are available and do I need to apply? A: Montana offers several tax credits including the Homestead Credit (limits assessment increases), Senior/Disability Credits, and Veteran's Disability Credits. All credits require separate applications filed with Sanders County Assessor by specified deadlines - none are automatic.

Q: How does the Homestead Credit work? A: The Homestead Credit doesn't reduce your property's market value but instead limits how much your taxable value can increase each year (typically capped at 10% annually). You must file a homestead declaration with the county assessor to qualify, and it must be renewed periodically.

Q: How often are properties reassessed in Sanders County? A: Montana requires property reassessment cycles, but frequency varies by property type. Residential properties are typically reassessed every 6 years, while commercial properties may be assessed more frequently. You can appeal assessments within 30 days of receiving your assessment notice.

Q: What happens if I pay my property taxes late? A: Sanders County charges penalties and interest on late property tax payments. Penalties typically start at 2% and increase monthly, with interest accruing daily. After several years of delinquency, properties may be subject to tax lien sales.

Q: Can I pay my property taxes online? A: Yes, Sanders County offers online payment options through their website. Credit card payments may include convenience fees. Electronic payments are mandatory for tax bills of $50,000 or more beginning in 2026.

Q: Why do my taxes differ from my neighbor's even though our homes are similar? A: Property taxes vary based on assessed value, but also on location within different special taxing districts. School districts, fire districts, and local improvement districts create "tax code areas" with different total mill levies, resulting in different tax rates even for similar properties.

Q: What should I do if I disagree with my property assessment? A: Contact the Sanders County Assessor's office first to discuss your concerns. If unresolved, you can file a formal appeal within 30 days of receiving your assessment notice. The appeal process includes review by the local tax appeal board and potentially the state tax appeal board.

Q: Are there special considerations for agricultural land? A: Yes, qualified agricultural land receives preferential tax rates (2.05% for 2025-2026) compared to non-qualified agricultural land (14.35%). Properties must meet specific criteria for agricultural use and production to qualify for these reduced rates.

Q: What happens to my taxes if I make home improvements? A: Major improvements that increase your property's market value may result in a higher assessment and supplemental tax bill. Minor maintenance and repairs typically don't trigger reassessment. New construction or substantial remodeling will likely increase your taxable value.

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