Idaho local data guide

How to Appeal Your Property Tax Assessment in Idaho

Idaho property owners can appeal an accurate or excessive property tax assessment by completing an informal review with their county assessor, submitting a formal written appeal to the County Board of Equalization by the fourth Monday in June, and appealing to the Idaho Board of Tax Appeals or District Court if the valuation dispute remains unresolved.

Updated with grounded research as of 2026-07-21.

The short answer

To appeal a property tax assessment in Idaho, property owners must first challenge the valuation rather than the tax rate or bill total. The process begins with an optional informal review with the county assessor's office. If unresolved, a formal appeal must be filed with the local County Board of Equalization (BOE) by 5:00 PM on the fourth Monday in June for regular assessment rolls. Taxpayers unsatisfied with the county BOE decision can appeal to the Idaho Board of Tax Appeals (BTA) within 30 days of the decision's mailing date or proceed to District Court.

Key facts

Governing Statute & Jurisdiction
Property tax assessments across Idaho's 44 counties are governed by Idaho Code Title 63. Appeals challenge estimated market valuation, not tax rates or tax bill amounts.
First-Level Appeal Deadline
Regular assessment roll appeals must be submitted to the County Board of Equalization by 5:00 PM on the fourth Monday in June (typically late June).
State-Level Appeal Deadline
Appeals of County BOE decisions must be filed with the Idaho Board of Tax Appeals within 30 days of the decision mailing date. Filing with the BTA is free.
Burden of Proof
Under Idaho Code § 63-511, the taxpayer holds the burden of proof to demonstrate with market data or property record evidence that the assessor's valuation is incorrect.

Step 1: Review Property Records and Request an Informal Review

Assessment notices are mailed by county assessors in early June. Upon receiving the notice, review your property details online or at the county assessor's office to check for inaccuracies in square footage, lot size, bedroom count, or structural condition.

Contacting the county deputy appraiser assigned to your parcel for an informal review is the recommended first step. Many valuation errors, such as incorrect square footage or unrecorded property damage, are resolved directly during this administrative step without formal board intervention.

  • Obtain your official property record card from the county assessor using your parcel number.
  • Identify unverified data errors, such as incorrect room counts or phantom improvements.
  • Gather arm's-length comparable sales that occurred prior to January 1 of the assessment year to support a lower market value.

Step 2: File a Formal Appeal with the County Board of Equalization

If the informal review does not resolve the valuation dispute, submit a written appeal form to the County Board of Equalization (BOE), which consists of the County Commissioners. The deadline is strictly 5:00 PM on the fourth Monday in June for regular assessment rolls.

During the county hearing, property owners are given a brief opportunity (usually 5 to 15 minutes) to present evidence. Because county assessors hold a presumption of correctness, property owners must present clear evidence such as recent comparable sales, professional appraisals, or repair estimates.

  • Submit the county-specific BOE appeal application prior to the fourth Monday in June deadline.
  • Include photos of severe physical deterioration, engineering estimates for major defects, or comparable market analysis.
  • Note that arguments based on inability to pay or rising tax rates are legally invalid before the BOE.

Step 3: Appeal to the Idaho Board of Tax Appeals or District Court

Property owners who disagree with the County BOE decision have the right to file an appeal with the state-level Idaho Board of Tax Appeals (BTA) or directly in District Court under Idaho Code § 63-511.

An appeal to the BTA must be postmarked or hand-delivered within 30 days of the mailing date of the BOE's written notice. The BTA process conducts a de novo ('anew') hearing where both parties present evidence before an independent hearing officer or board member.

  • There is no state fee to file an appeal with the Idaho Board of Tax Appeals, and legal representation is optional.
  • Hearings are typically scheduled in the county where the subject property is located within 90 to 120 days of acknowledgment.
  • Further appeals of BTA decisions must be filed in Idaho District Court within 28 days of the BTA's final decision.

Common questions

Can I appeal my Idaho property taxes because my tax bill went up?

No. Idaho law explicitly prohibits appealing property tax rates or tax bill amounts. You may only appeal the assessed market value or classification of your property as determined by the county assessor.

What evidence is most effective when appealing an Idaho property assessment?

The most effective evidence includes arm's-length sales of 3 to 5 comparable properties sold prior to January 1 of the tax year, an independent fee appraisal, proof of uncorrected structural damage, or documented errors in the county parcel record.

What happens if I miss the June filing deadline for property tax appeals?

Missing the fourth Monday in June deadline for the regular assessment roll forfeits your right to appeal that year's valuation before the County Board of Equalization. Subsequent assessment rolls (such as new construction) have separate deadlines in November and January.

Related Idaho questions

  • What evidence is required when appealing a property tax assessment in Idaho?
  • How does the Idaho Homeowner's Exemption affect my property tax valuation?
  • What is the difference between appealing to the Idaho Board of Tax Appeals versus District Court?

Sources and verification