Tax Commission staff outline Idaho property‑tax system, assessed‑value trends and recent relief measures

Cathlyn Ireland, a property tax policy research specialist with the Idaho State Tax Commission, presented an overview of Idaho’s property‑tax system to the Senate Local Government and Taxation Committee, updating members on assessed values, levy calculations, assessment practice and recent legislative tax relief.

Ireland told the committee that assessors must appraise or index property annually, that assessors operate on a five‑year reappraisal cycle (with at least 20% of parcels physically inspected each year), and that Idaho’s lien date for assessment is January 1. She said the state tax commission provides technical support, including a team of consulting appraisers who work regionally with county assessors.

Using 2024 numbers, Ireland reported total statewide assessed value at roughly $363,000,000,000, an increase from $342,000,000,000 in 2023. She described sharp growth between 2021 and 2022 — roughly a $110,000,000,000 increase — driven in part by population movement during the COVID…