Rate Breakdown

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

How Property Tax Works in Twin Falls County

Twin Falls County follows Idaho’s standard property‑tax framework, which combines a local assessment with several millage rates that create the final tax bill. The county’s Appraisal Office evaluates every parcel’s “market value” once a year, usually in August. If your property is a single‑family home, the valuation is based on the comparable sales within the past 18 months. For commercial, agricultural, or multi‑family properties, the appraisal uses different methods, such as rental income or cost‑plus approaches.

After the appraisal, the assessed value is multiplied by the county’s combined millage rate. The millage rate is expressed in “mills,” where one mill equals one‑thousandth of a dollar (0.001). For example, if the combined rate is 15.26 mills and your assessed value is $200,000, your base tax is $200,000 × 0.01526 = $3,052. Sr. respondents may also add the city’s millage if the property lies within city limits. The final bill is calculated by adding state add‑on rates and multiplying by the assessed value.

Property owners receive a self‑contained notice in February, including the assessed value, millage rates, and the due date. The notice is a legal record, and the county will reassess only if a new appraised value is submitted.

Available Exemptions

Homeowners can reduce their statewide or local tax load through various exemptions offered by Idaho. Twin Falls County implements the following:

• Homestead Exemption – Excludes up to $7,500 of the assessed value from taxation for primary residences. Owners must file a homestead claim by May 31 each year.
• Senior Citizen Exemption – For residents 62 and older, up to $3,000 of assessed value can be exempted. Proof of age and residency is required.
• Disability Exemption – Individuals who are permanently and totally disabled may qualify for a partial exemption. Documentation from a physician or state agency is needed.
• Veteran Exemption – Active duty, Army, Navy, Marine, and Air Force veterans can receive a 70% exemption on the assessed value of a single‑family home, provided they submit a state veterans card.

Be sure to file all exemption applications by the deadline noted on your property‑tax notice. Once approved, the exemption amount is deducted from your taxable assessed value before the rate is applied.

Payment Schedule & Deadlines

Twin Falls County offers two installment options:

• Full‑Payment Option – One payment due on June 1. The rate is 100% of the total bill.
• Two‑Installment Option – First payment of 45% due on June 1, second payment of 55% due on November 1. The total interest cost is negligible, but late payment penalties apply.

Payments that arrive after the posted due date are subject to a 10% late fee per month, and additional penalties accrue if your account remains unpaid for six months. The county offers online payment through their portal and provides direct debit options that automatically deduct the payment on the scheduled dates.

To protect yourself from penalties, it’s advisable to schedule a payment in advance or opt for full payment if you can afford it.

Appealing Your Assessment

If you believe the assessed value is too high, you can file an appeal with the Twin Falls County Assessor’s Office. The appeal process is mandatory if you want to reduce your tax bill based on assessed value alone. Here’s a brief outline:

1. File a Notice of Intent – Submit a written statement to the Assessor’s Office by the notice deadline. Keep a copy for your records.
2. Submit Documentary Evidence – Provide recent comparable sales, a professional appraisal, or other evidence supporting a lower value.
3. Hearing – The Assessor will Schedule a hearing, usually within 30 days. You may request a written notice for your review.
4. Decision – If the assessor accepts your evidence, the assessed value will be adjusted and tax recalculated. If denied, you have the right to appeal to the Idaho State Tax Court within 90 days of the decision.

All appeal submissions should include contact information, parcel number, and a clear claim. Attach the supporting documents, and send everything by the deadline listed on your property‑tax notice. By following these steps, you can ensure your property’s value accurately reflects its market worth and that you pay a fair share of Twin Falls County taxes.