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State of Idaho Property Taxes

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State Tax Summary
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Real property tax is called property tax in the state of Idaho. The state of Idaho has forty-four counties, with the county treasurer as the ex-officio collector in all counties. County Assessors maintain and set property valuations. The County Auditor certifies property valuations. The County Treasurer collects current and delinquent property tax. The Idaho State Tax Commission may assist local governments for compliance with the law and to ensure property tax assessments are fair. It does not collect or use property taxes.

All Idaho property that is not exempt is subject to tax. The Idaho Constitution authorized an “ad valorem tax “ of up to $1 per $100 of assessed value; however, the state tax was suspended in 1965. Property taxes are determined by the final tax rate as a result of budgets established to provide services, an assessor’s assessment, a county auditor’s calculations, and laws administered by the Idaho State Tax Commission. Property assessment in Idaho is a series of events that takes 18 months from start to finish . The Idaho property tax is a tax on land, buildings, structures, and other improvements attached to the land, or placed upon a foundation. Typical improvements may be a building, house or mobile home, fences, and paving.


RESIDENTAL Exemption claims must be filed to receive exemption from specially treated property.

  • Circuit Breaker: The Circuit Breaker program of up to $1200 reduces property taxes on the primary residence and up to one acre of land. An application is due to the appropriate County Board of Equalization by April 15 for a tax reduction. The applicant must have an adjusted gross income of $20,750 or less and meet at least one of the following as of January 1: age 65 or older, widow(er) of any age, blind, fatherless or motherless child under 18 years of age, former prisoner of war, veteran with at least 10% service-connected disability or disabled as recognized by the Social Security Administration, Railroad Retirement or Federal Civil Service. All recipients of the Circuit Breaker program receive the Homeowner’s Exemption.
  • Damaged or destroyed property: An application must be filed before the fourth Monday of June to exempt destroyed or damaged property.
  • Hardship Exemption: Homeowners may qualify for a hardship exemptions if the taxpayer filed an application with the county board of equalization by June 20, including a sworn statement stating the applicant’s financial status.
  • Property Tax Deferral: Any homeowner eligible for the “circuit breaker” program may qualify for the 2008 Property Tax Deferral program. After circuit breaker benefits are applied, payment of property taxes for a home and up to one acre of land may be postponed with 6% interest each year. Eventually, this tax and interest must be repaid.


  • Agriculture Land Credit: The Agricultural Land Tax Credit is an exemption for the speculative portion of agricultural land. An application is due to the county assessor by March 15.
  • Fruits and vegetables: A taxpayer must file a declaration with the County Board of Equalization by the first Monday of December. List the seeds, fruits and vegetables held for human consumption that were sold and shipped out of the state of Idaho before December. Include proof of shipment.
  • Leased property: Leased property is taxable to the property owner. If part of the property is used or leased for a fraternal, benevolent or charitable society, to qualify for an exemption, it must be assessed separately.
  • Pollution control property: A taxpayer must file a declaration by March 15 with the local county assessor or with the Commission for centrally assess property to exempt property used exclusively for water or air pollution control.
  • Recycling equipment: A taxpayer must file a declaration by March 15 with the local county assessor to claim an exemption for qualified recycling equipment.
  • Remediated land: A property owner must do the following to qualify for a remediated land exemption (1) enter a voluntary remediation agreement and apply to the Department of Health and Welfare, (2) complete successfully the work plan outlined with the Department, and 3) get a signature from the Department that they will not sue the owner.

Responsible agency

  • Idaho State Tax Commission
  • Ad Valorem Tax Division
  • 800 Park Plaza IV
  • Boise, Idaho 83722
  • Voice (208) 334-7733
  • FAX (208) 334-7844
  • E-mail
  • Web Site:

Property tax calendar

  • Assessment date: January 1
  • Valuation Notice Date: Notices are sent annually by first Monday in June
  • Appeal Deadline: 30 days from date of mailing of notice
  • Bill Payment Date: One billing; due December 20; Taxes may be paid in two installments: first due December 20 and second due June 20 of following year

Property tax rates and dates

  • Annual assessment of real property: Yes
  • Classification of property: All assessed at 100% of full market value. Taxes are collected one year in arrears.
  • Fiscal year: October 1 through September 30
  • Levels responsible for assessment: County
  • Reassessment cycle: Every 5 years; Reassessments are completed by March 1 of the immediate following year
  • Tax Calculation Rate: (Levy Rates x Assessed Property Value) + (Value–Exemption) x Levy = Tax Due

Tax Collector and Officials

The county treasurer is the ex-officio collector in all counties. County Assessors maintain and set property valuations. The County Auditor certifies property valuations. The County Treasurer collects current and delinquent property tax.


Specific deduction claim forms are available from:

  • Idaho State Tax Commission
  • Ad Valorem Tax Division
  • 800 Park Plaze IV
  • Boise, Idaho 83722
  • http//

Forms due dates

Applications for deductions against real property must be filed during the twelve months before June 11 to be effective for taxes payable in the following year. The filing deadline for deduction applications for mobile homes and manufactured homes that are not assessed as real property is the twelve months before March 31, unless noted below. All deductions for real property require that the ownership must be recorded as of March 1 of the assessment year for taxes payable the following year. Manufactured and mobile homes must be owned by January 15 to be eligible for the deductions to be applied to the tax bill for that year.

State assessor's manual

  • Idaho State Tax Assessors Manual
  • PO Box 36
  • 800 Park Plaza IV
  • Boise, Idaho 83722
  • Phone (208) 334-7733
  • Price $15.00

How property tax determined

Residential property is assessed at 100% of market value and the assessor determines the fair market value. The assessor can use three methods.

  • Cost Approach: At current labor and material prices, estimate how much it would take to replace the property with one similar to it. Use this method when there are no sales of comparable properties.
  • Income Approach: For an apartment or office building, estimate how much income the property can produce.
  • Market Approach: Use other comparable properties that have sold recently, determine the most probable sales price of the subject property.

Appeal Procedure

  • First: Try to resolve the problem in an informal meeting with the tax assessor in the local county.
  • Second: Next, if not satisfied with the informal meeting, make an appeal in writing to the County Board of Equalization (BOE) by the fourth Monday in June.
  • Third: If not satisfied, appeal before the State Board of Tax Appeal.
  • Fourth: If not satisfied, request a hearing before the county’s District Court where the property is located.
  • Fifth: Request a hearing before the Supreme Court, after all appeals to the District Court and administrative appeals are exhausted.

Additional tax classifications

  • Agricultural property tax: Agricultural and forest property is Class III and assessed at 100% of market value. Agricultural real estate is assessed at net earning capacity value and 100% of productivity. The assessor establishes agricultural income using prices, expenses, production and local conditions
  • Commercial property tax: Commercial real estate is Class II and assessed at 100% of market value. The Idaho Corporate Headquarters Incentive Act of 2005 created rebates for improvements to real and personal property, newly constructed or related to headquarter facilities. A taxpayers may qualify for a rebate when the capital investments in a new plant is at least $50 million and creates at least 500 new jobs.
  • Personal property tax: Personal property is Class II and taxed at 100% of market value.
  • Utility property tax: Utilities are Class I and assessed at 100% of market value for property owned by public utilities and used in the business of utilities.

Additional tax bills and charges

  • Construction Work in Progress: An occupancy tax is imposed in Idaho in lieu of property tax, on all new construction during the construction year. The tax amount is the same as if the structures were on the assessment rolls on January 1, but prorated for portion of the year based on occupancy
  • Corrected bill: When an error is found on the original tax statement or when property owners go before the Board of Review, resulting in tax increases or decreases, a correct bill is issued when the corrections are made. Corrected bills are also issued when levy rates are wrong, the house is on the wrong tax lot and for homeowner exemption.
  • Delinquent taxes: Delinquent balances are applied to subsequent bills. A taxpayer may apply to have late charges, interest and property taxes canceled due to undue hardship or property damaged by a casualty loss event. No notices are sent for delinquent taxes in Idaho.
  • Penalty and Interest charges: 2% penalty on each installment missed. Interest is 1% each month on the amount due when taxes are delinquent for more than one year.
  • TIF: Tax Increment Financing (TIF) taxes can be assessed by the county board for specific purposes as deemed necessary. Some counties combine TIF taxes with the tax bill; other counties have a separate billing.

Current Legislation

Proposed and temporary rules have been submitted for publication to the Department of Administration, Office of Administrative Rules, for the 2008 Legislative Session.


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