Rate Breakdown

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

How Property Tax Works in Boise County

Boise County’s property tax system follows Idaho’s statewide framework, which combines a county‑level millage rate with specific local levies to create the total tax burden. Property values are assessed by the Idaho Department of Finance’s property assessment office and then translated into a tax bill using the county’s millage rate, expressed in mills (thousandths of a dollar per dollar of assessed value). For the 2024 tax year, Boise County’s base rate is approximately 20.9 mills, which is applied to the assessed dollar value of each parcel. In addition to the base rate, the county may impose supplemental levies for schools, special districts, or other services; these are added to the millage beyond the basic rate. Property taxes are calculated annually, but most households can choose between a single full payment or two installment payments that are due on July 15 and December 15 of the same year. The assessment notice sent by the Boise County Tax Collector typically arrives in mid‑January, giving homeowners time to review the assessed value and millage before the next fiscal cycle.

Available Exemptions

Idaho offers several exemptions that can reduce the taxable value of a homestead. Below are the most common exemptions available to Boise County residents:

• Homestead Exemption – Eligible homeowners can receive a 50 % reduction in assessed value, up to a maximum of $40,000. The exemption is available to primary residences that meet the homestead definition under Idaho Code § 48‑1433.
• Senior Citizen Exemption – Senior residents (age 65 or older) may qualify for an exemption of up to $20,000, provided they have owned the home for at least a year and the property is not their primary residence elsewhere.
• Disability Exemption – Individuals with a permanent disability that significantly impairs mobility or function may receive a 20 % reduction on the value of the dwelling or even a full exemption for a portion of the property, subject to proof of disability.
• Veteran Exemption – Veterans, especially those who are 100 % disabled or who received a Medal of Honor, may be eligible for a full exemption or a reduced taxable value of up to $25,000, depending on the type of service and service classification.

To apply for any exemption, homeowners must file the appropriate forms with the County Tax Collector and attach supporting documentation (e.g., proof of age, disability assessment, veteran’s ID). These forms are typically due by the end of March each year.

Payment Schedule & Deadlines

Boise County follows an installment payment schedule that provides flexibility while ensuring timely revenue collection. The key dates and penalties are:

• First installment – Due on July 15. This payment covers the first half of the tax year.
• Second installment – Due on December 15. This payment concludes the annual tax obligation.
• Full payment option – Available for those who prefer a single payment of the entire tax amount. The due date for a full payment is the same as the second installment.
• Late payment penalties – Payments received after the due date incur a 5 % late fee on the outstanding balance. If the debt remains unpaid, the tax collector may add a 25 % penalty and enforce collection through notices, liens, or foreclosure proceedings.

Boise County encourages prepayment by setting up automatic bank drafts; the county offers a modest 1 % discount on the total tax bill for ad‑hoc payments made before the first installment due date.

Appealing Your Assessment

Disputing a property assessment in Boise County is a structured process that allows homeowners to present evidence and obtain a revised tax bill. The steps are:

• Step 1: Review the Assessment Notice – Carefully examine the property’s assessed value, the millage rate applied, and any other levies listed. Identify any discrepancies in property description, lot size, or improvements.
• Step 2: File a Written Appeal – Submit a formal appeal form to the Boise County Tax Collector’s Office within 30 days of the assessment notice date. Include proof of the correct market value, recent appraisals, photographs, or zoning maps as supporting documents.
• Step 3: Attend the Hearing – The County Tax Appeal Board will schedule a hearing, usually within 45 days after the appeal is filed. At the hearing, the homeowner can present additional evidence and arguments.
• Step 4: Receive the Decision – The Board’s ruling is final and generally issued in writing. If you are dissatisfied with the outcome, you may request a review by the Idaho Board of Appellate Tax Appeals, but this is limited to procedural errors rather than new evidence.

Persistence and accurate documentation are key. Homeowners who successfully reduce their assessed value can see significant savings on each installment.