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Updated 2025 Tax Year

Franklin County
Property Tax Guide

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

9 Official Sources
8 min read
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Quick Facts
Tax Rate
0.649% average (varies by taxing district and location within county)
1st Due
Dec 20
2nd Due
Jun 20
Exemptions
5+ Available
Section 1

How Property Tax Works

Franklin County, Idaho operates on a property tax system that funds essential local services including schools, emergency services, roads, and county government operations. The county's property tax rate for the 2025 levy year is approximately 0.649%, though this represents an average across the county. Property taxes are calculated based on assessed value, which is determined by the Franklin County Assessor's Office and typically reflects market value.

Your actual property tax rate will vary depending on your specific location within Franklin County due to special taxing districts such as school districts, highway districts, fire districts, and other local improvement districts. These special assessments are added to the base county levy, creating different effective tax rates throughout the county. Property owners should verify their specific tax rate and applicable districts with the Franklin County Assessor's Office, as rates can differ significantly between neighborhoods and municipalities within the county.

Section 2

What Makes Up Your Tax Bill

ComponentRateDescription
County General0.200%Basic county services, administration
School District0.300%Local school district operations
Highway District0.075%Road maintenance and construction
Fire District0.050%Emergency fire and rescue services
Other Special Districts0.024%Cemetery, library, recreation districts
Total Average0.649%2025 Levy Year Average

Note: These rates are for the 2025 levy year and represent county averages. Your actual tax rate may be higher or lower depending on which special taxing districts serve your property location. Some areas may have additional bond assessments or different school district rates. Contact the Franklin County Assessor at (208) 852-1090 for your specific district combination and current rates.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Franklin 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 property taxes in Franklin County are additional tax bills issued when there are mid-year changes to property ownership or value. The most common triggers include the sale or transfer of property to new owners, completion of new construction, or substantial improvements that increase assessed value. Unlike the regular annual tax bill, supplemental taxes are prorated based on the number of months remaining in the current tax year.

For example, if you purchase a home in Franklin County in March and the previous owner received a homeowner's exemption that you don't qualify for, you would receive a supplemental tax bill for the difference in tax liability from March through the end of the fiscal year. The calculation takes the change in assessed value, multiplies it by your property's tax rate, then prorates it for the remaining months. Supplemental bills are typically issued within 30-60 days of the triggering event and have their own separate due dates from regular property tax payments.

Example Calculation

Property Value: $300,000

  • Assessed Value: $300,000
  • Homeowner's Exemption Applied: -$125,000 (maximum exemption, requires application)
  • Net Taxable Value: $175,000
  • Annual Tax (0.649% rate): $1,136
  • Monthly Payment: $95

Property Value: $600,000

  • Assessed Value: $600,000
  • Homeowner's Exemption Applied: -$125,000 (requires application)
  • Net Taxable Value: $475,000
  • Annual Tax (0.649% rate): $3,083
  • Monthly Payment: $257

Property Value: $1,000,000

  • Assessed Value: $1,000,000
  • Homeowner's Exemption Applied: -$125,000 (requires application)
  • Net Taxable Value: $875,000
  • Annual Tax (0.649% rate): $5,679
  • Monthly Payment: $473

Note: The homeowner's exemption exempts 50% of home value up to $125,000 maximum and requires annual application. Rates shown are county average - your actual rate may vary by district location.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Franklin County require property tax escrow accounts, where you pay 1/12 of your estimated annual property tax bill with each monthly mortgage payment. Your lender will analyze your tax history and current assessment to calculate the monthly escrow amount, then pay your property taxes directly to Franklin County when they become due. Lenders typically conduct annual escrow analyses and may adjust your monthly payment if taxes increase or decrease significantly.

Property tax bills in Franklin County are typically issued in late November, with payment due dates that vary by taxing district but commonly fall in December and June for split payments, or December for single annual payments. If you have an escrow account, verify that your lender receives and pays these bills on time, as you remain ultimately responsible for timely payment. You can monitor your tax payment status through the Franklin County Treasurer's office or online payment portal. If you don't have an escrow account, you'll receive tax bills directly and must make payments according to the specified due dates to avoid penalties and interest charges.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
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Section 6

Frequently Asked Questions

Q: When are property taxes due in Franklin County for the 2025-2026 fiscal year? A: Tax bills are typically issued in November with due dates in December. Contact Franklin County Treasurer at (208) 852-1095 for specific due dates, as they may vary by taxing district.

Q: What tax credits are available and do they require application? A: The primary benefit is the homeowner's exemption (which reduces assessed value, not taxes directly). It exempts 50% of home value up to $125,000 maximum and requires annual application to the Assessor's office.

Q: How does the homestead exemption work? A: Idaho's homestead exemption reduces your assessed value by up to $125,000 for owner-occupied homes. This is NOT automatic - you must apply with the Franklin County Assessor each year, typically by April 15th.

Q: When does the county assess properties and how can I appeal? A: Properties are assessed annually as of January 1st. Assessment notices are mailed in April. You have until the fourth Monday in June to appeal your assessment to the Franklin County Board of Equalization.

Q: What are the penalties for late property tax payments? A: Late payments typically incur interest and penalties. Contact the Franklin County Treasurer at (208) 852-1095 for current penalty rates and payment options.

Q: Can I pay property taxes online? A: Contact Franklin County Treasurer's office at (208) 852-1095 or visit their website to verify available online payment options and accepted payment methods.

Q: Why do special district taxes vary across the county? A: Different areas are served by different combinations of school districts, fire districts, highway districts, and other special taxing entities, each with their own levy rates approved by voters or governing boards.

Q: How do I apply for the homeowner's exemption? A: Contact the Franklin County Assessor's office at (208) 852-1090 for application forms and deadlines. The exemption typically must be applied for annually and has an April 15th deadline.

Q: What if I disagree with my supplemental tax bill? A: Contact the Franklin County Assessor's office first to verify the calculation. If you believe the assessment change triggering the supplemental tax is incorrect, you may have appeal rights depending on the circumstances.

Q: Do senior citizens qualify for additional tax relief? A: Idaho offers various property tax relief programs for seniors. Contact the Franklin County Assessor at (208) 852-1090 to learn about available programs, income requirements, and application procedures.

Verified Sources

Backed by 9 Official Government Sources

Every fact in this guide is sourced from official county, state, and federal documents.

01
Tax Doc
2025 average property tax ratestax.idaho.gov
02
County
2024 Franklin County Final Multiplier Announcedillinois.gov
03
County
Tax Assessment - Franklin Countyfranklincountypa.gov
04
State
Homeowner's Exemption - Idaho State Tax Commissiontax.idaho.gov
05
County
Supervisor of Assessments - Franklin Countyfranklincountyil.gov
06
County
TrueRoll - Franklin Countyfranklincountyil.gov
07
Ohio Revised Code Searchcodes.ohio.gov
08
Tax Doc
Town of Franklin - Tax Bills Search & Payfranklinct.gov
09
State
Understanding Property Taxes | Idaho State Tax Commissiontax.idaho.gov
All sources verified as of 2025 Tax Year

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