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Updated 2025 Tax Year

Bannock County
Property Tax Guide

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

10 Official Sources
8 min read
Quick Facts
Tax Rate
0.973% effective rate (varies by special taxing districts)
1st Due
Dec 20
2nd Due
Jun 20
Exemptions
4+ Available
Section 1

How Property Tax Works

Bannock County, Idaho operates under a property tax system that funds essential local services including schools, law enforcement, fire protection, and county operations. Property taxes are the primary funding source for these services, with the county serving as the collection agent for multiple taxing jurisdictions. The property tax system is administered by the Bannock County Assessor's Office, which determines assessed values, and the County Treasurer, who handles billing and collection.

The effective tax rate in Bannock County for 2025 is approximately 0.973% of assessed value, though actual rates vary significantly by location within the county due to special taxing districts such as school districts, highway districts, fire districts, and other local improvement districts. Property owners may be subject to different combinations of these district taxes depending on their property's location. The county assesses properties annually, and tax bills are typically divided into two installments for payment convenience.

Section 2

What Makes Up Your Tax Bill

ComponentRateDescription
County General~0.250%Basic county services, administration
School District~0.450%Local school district operations (varies by district)
Highway District~0.075%Road maintenance and improvement
Fire District~0.125%Fire protection services (varies by district)
Other Special Districts~0.073%Cemetery, library, recreation districts
Total Composite Rate0.973%FY 2025-2026 average rate

Note: These rates are for FY 2025-2026 and represent averages. Actual rates vary by specific location within Bannock County based on which special taxing districts serve your property. Contact the Bannock County Assessor at (208) 236-7340 for your specific district combination.

Section 3

When Are Property Taxes Due?

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

First Installment
Dec 20
Delinquent after Dec 10
Second Installment
Jun 20
Delinquent after Apr 10
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 taxes in Bannock County are triggered by changes in property ownership, new construction, or improvements that increase a property's assessed value mid-tax year. When these events occur after the annual assessment date (typically January 1st), the county issues a supplemental tax bill to capture the difference between the old and new assessed values for the remainder of the tax year.

The supplemental tax is calculated by taking the difference between the new assessed value and the previous assessed value, multiplying by your property's applicable tax rate, then prorating for the months remaining in the tax year. For example, if you complete a $50,000 addition in March and your total tax rate is 0.973%, your supplemental tax would be approximately ($50,000 × 0.00973 × 9/12 months) = $365. Supplemental bills are typically issued within 60 days of the triggering event and have separate due dates from regular property tax installments.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Homeowner's Exemption Applied: -$125,000 (maximum exemption, requires application)
  • Net Taxable Value: $175,000
  • Annual Tax: $175,000 × 0.00973 = $1,703
  • Monthly Payment: $142

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Homeowner's Exemption Applied: -$125,000 (requires application)
  • Net Taxable Value: $475,000
  • Annual Tax: $475,000 × 0.00973 = $4,622
  • Monthly Payment: $385

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Homeowner's Exemption Applied: -$125,000 (requires application)
  • Net Taxable Value: $875,000
  • Annual Tax: $875,000 × 0.00973 = $8,514
  • Monthly Payment: $710

Note: Homeowner's exemption requires annual application and covers 50% of home value up to $125,000 maximum. Additional exemptions may be available for seniors, veterans, or disabled persons - all require separate applications.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Bannock County require property tax escrow accounts to ensure timely tax payments. Your lender collects monthly payments equal to 1/12 of your annual property tax bill along with your mortgage payment. These funds are held in escrow and the lender pays your property taxes directly to Bannock County when due. Lenders typically conduct annual escrow analyses to adjust monthly payments based on actual tax bills and any changes in assessed value.

Property owners with escrow accounts should verify that their lender has current contact information for the Bannock County Treasurer's Office and confirm payments are made by the December 20th and June 20th deadlines. If you don't have an escrow account, you're responsible for paying taxes directly to the county. You can pay online through the Bannock County website, by mail, or in person at the Treasurer's Office. The county recommends setting up automatic payments or calendar reminders to avoid late fees and interest charges.

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 Bannock County? A: For FY 2025-2026, first-half taxes are due December 20, 2025, and second-half taxes are due June 20, 2026. Both payments must be received by 5:00 PM on the due date to avoid penalties.

Q: What tax credits are available and do they require application? A: The primary credit is the Homeowner's Exemption, which exempts 50% of home value up to $125,000 maximum. This REQUIRES annual application to the Assessor's Office. Additional credits for seniors (Circuit Breaker), veterans, and disabled persons are available but each requires separate applications with specific deadlines.

Q: How does the Homestead exemption work? A: Idaho's homestead exemption reduces your assessed value by exempting 50% of your home's value up to a maximum of $125,000. It does NOT cap assessment increases - it reduces the taxable value. You must apply annually and occupy the property as your primary residence.

Q: How often are properties reassessed? A: Bannock County assesses all properties annually as of January 1st. Assessment notices are typically mailed in April, with appeals due by the fourth Monday in June.

Q: What are the penalties for late payment? A: Late payments incur interest calculated from January 1st (for second-half payments) or July 1st (for first-half payments if paid late) until paid in full. Additional penalty fees may apply for payments more than 30 days overdue.

Q: Can I pay property taxes online? A: Yes, Bannock County offers online payment options through their official website. Credit card payments may incur processing fees. Bank transfers and electronic checks typically have lower or no fees.

Q: Why do tax rates vary within Bannock County? A: Different areas are served by different combinations of special districts (school districts, fire districts, highway districts, etc.). Your specific rate depends on which districts provide services to your property location.

Q: How do I appeal my property assessment? A: File an appeal with the Bannock County Board of Equalization by the fourth Monday in June following your assessment notice. You must provide evidence supporting your claim that the assessed value is incorrect.

Q: Are special district taxes included in my regular bill? A: Yes, all applicable taxes for your property location (county, school, fire, highway districts, etc.) are combined on one bill collected by the County Treasurer and distributed to the appropriate jurisdictions.

Q: What happens if I don't receive my tax bill? A: Property owners are responsible for paying taxes whether or not they receive a bill. Contact the Bannock County Treasurer's Office at (208) 236-7280 to obtain your tax information and ensure your mailing address is current.

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