Rate Breakdown

Property taxes in Teton County are calculated by multiplying the assessed value (minus exemptions) by the total local millage rate.

How Property Tax Works in Teton County

In Teton County, Idaho, property taxes are levied at the county level but are based on the assessed value of a taxable parcel. The County Assessor’s Office conducts an annual reassessment that typically occurs on the first day of the tax year, setting a new base value for each property. The millage rate—expressed as mills, where one mill equals one mill per dollar of assessed value—is established by the County Board of Commissioners and various taxing districts such as schools, fire districts, and the County itself. By 2026, the combined millage rate in Teton County is generally around 8.2 mills, meaning properties pay $8.20 for every $1,000 of assessed value. Multiplying the assessed value by the millage rate and dividing by 1,000 yields the annual tax liability. Because assessed values can decline if market prices fall, some homeowners may receive a lower tax bill in a slow market, offering a natural buffer against sharp tax increases.

Available Exemptions

Homeowners in Teton County can take advantage of several county‑ and state‑level exemptions that reduce taxable value. The most common is the Homestead Exemption, which deducts up to $8,000 for primary residences and can increase to $16,000 for households with total income under $90,000. The Senior Citizen Exemption allows residents aged 65 or older to deduct $10,000 from assessed value, whereas veterans get a $12,000 discount through the Veteran’s Exemption. Disabled individuals, including those who are blind or have a service dog, qualify for the Disability Exemption, which can remove up to $10,000 from assessed value if the property is used by the disabled person. Property owners must file exemption applications with the County Assessor’s Office by May 1 of the tax year in which they seek relief.

Payment Schedule & Deadlines

Teton County allows taxpayers to pay their property taxes in two equal installments or in full at once. The 1st installment is due September 30, and the 2nd installment is due March 31. Paying by mail or online through the County’s payment portal before the deadline allows a 2.5% discount on the installment. Late payments incur a 5% penalty per month, with the penalty compounded monthly. For example, a $1,000 tax due by September 30 that is paid on October 5 will incur a 5% penalty ($50) plus interest at 1.5% per month. Axiliary liens may be placed on delinquent properties after 90 days, threatening foreclosure if payments remain overdue.

Appealing Your Assessment

Homeowners unsatisfied with their assessed value can file an appeal during the annual open‑season for county tax appeals, typically held from August 1 to August 15. The appeal must be submitted in writing to the Teton County Assessor’s Office, accompanied by evidence such as recent appraisal reports, comparable sales data, or a purchase contract. If the appeal is denied, the property owner may request a hearing before the Tax Review Board within 30 days of the decision. During the hearing, the owner can present oral testimony and fixed exhibits. The Board’s decision is final unless a subsequent administrative appeal is presented within 60 days to the Office of the General Counsel. Proper documentation and timely filing are crucial to maximize chances of a favorable reassessment outcome.