How to appeal a Ada County, ID property assessment
✓ Verified — Last verified October 24, 2026
Filing details published for Ada County. Match the notice and assessment cycle to the official instructions.
Official appeal instructionsNot tax or legal advice; confirm with your county.
Filing timing
Notice-dependent instructions
File primary-roll appeals by the fourth Monday of June; consult the county for other assessment rolls.
Official source. Verified .
Where to file
Ada County Commissioner’s Office, for the Board of Equalization.
Official source. Verified .
Assessment notice period
Primary assessment notices are sent no later than the first Monday of June.
Official source. Verified .
Official offices
Ada County Assessor
Sources for these instructions
https://adacounty.id.gov/assessor/property-assessments-records/assessment-notices-appeals/
Completed forms must be filed with the Ada County Commissioner’s Office on or before the 4th Monday of June at 5:00 p.m.
Verified October 24, 2026
https://adacounty.id.gov/assessor/property-assessments-records/assessment-notices-appeals/
Completed forms must be filed with the Ada County Commissioner’s Office
Verified October 24, 2026
https://adacounty.id.gov/assessor/property-assessments-records/assessment-notices-appeals/
Assessment Notices and Appeals
Verified October 24, 2026
Continue with your property
Common questions
Where do I file a Ada County assessment appeal?
Ada County Commissioner’s Office, for the Board of Equalization.