Idaho maintains an incredibly favorable property tax climate for primary homeowners. With a statewide effective tax rate of just 0.50%, the state ranks among the lowest in the nation. This low burden is heavily supported by the state’s generous Homeowner’s Exemption, which shields up to $125,000 of a primary residence’s market value from taxation entirely (est., Tax Foundation 2026 / U.S. Census ACS 2023).
Idaho’s property tax system underwent a massive overhaul in recent years to protect homeowners. Through legislative actions like House Bill 292, the state now redirects hundreds of millions of dollars in state sales tax revenue to directly offset local school bonds. This shifts the financial burden away from property taxpayers and keeps effective rates exceptionally low across the state.
100% Assessment and the 5-Year Reappraisal Cycle
Unlike some states that use fractional assessment, Idaho requires county assessors to assess all property at 100% of its current market value as of January 1 each year.
To ensure fairness, Idaho law mandates a five-year reappraisal cycle. This means every property must be physically or visually inspected by the county assessor at least once every five years. In the intervening four years, assessors use statistical market adjustments (analyzing recent home sales) to update property values annually.
Idaho statewide effective rate. On a $350,000 home (after a $125,000 exemption), expect approximately $1,125 per year at the statewide average. (est., Tax Foundation 2026 / Census ACS 2023).
| Home Value | Annual Tax (est.) * | Monthly Payment | vs. U.S. Average |
|---|---|---|---|
| $200,000 | $500 | $41 | -$1,300 below avg. |
| $350,000 | $1,125 | $93 | -$2,025 below avg. |
| $500,000 | $1,875 | $156 | -$2,625 below avg. |
| $750,000 | $3,125 | $260 | -$3,625 below avg. |
| $1,000,000 | $4,375 | $364 | -$4,625 below avg. |
* Estimates use 0.50% statewide effective rate and assume the homeowner claims the max $125,000 Homeowner’s Exemption (or 50% for the $200k home). U.S. average uses 0.90% with no exemption. Source: est., Tax Foundation / Census ACS 2023.
The Homeowner’s Exemption ($125,000 Limit)
The single most important protection for Idaho residents is the Homeowner’s Exemption. If you own and occupy a home as your primary residence in Idaho, the state exempts 50% of the value of the home and up to one acre of land, capped at a maximum limit.
For the 2024 and 2025 tax years, the maximum limit is permanently set at $125,000.
- If your home is worth $200,000: 50% is $100,000. You are taxed on $100,000.
- If your home is worth $400,000: 50% is $200,000, which exceeds the limit. You take the maximum $125,000 exemption and are taxed on $275,000.
Because of skyrocketing home values in recent years, almost all homes in major metro areas (like Boise and Coeur d’Alene) utilize the full $125,000 maximum cap.
Property Tax Reduction (Circuit Breaker)
Idaho offers a Circuit Breaker program that acts as a direct property tax reduction for vulnerable homeowners. Depending on income and property value, the program can reduce a tax bill by $250 to $1,500.
- Eligibility: You must be 65 or older, a widow(er), blind, fatherless/motherless child under 18, a former POW/hostage, a disabled veteran, or disabled as recognized by the SSA.
- Income Limit: For the 2026 application cycle (based on 2025 income), total household income cannot exceed $39,130.
Note: You must apply for this program every single year through your county assessor between January 1 and April 15.
Major County Tax Rates in Idaho
Because Idaho funds much of its local government through property taxes, rates vary significantly depending on the local commercial tax base. Kootenai County (Coeur d’Alene) enjoys the lowest effective rate in the top 10 (0.45%), subsidized heavily by soaring luxury property values around the lakes.
Conversely, Nez Perce County (Lewiston) requires a much higher effective rate (1.21%) to fund its schools and services due to a smaller valuation base.
| County | Effective Rate | Annual Tax on $350k Home (with $125k Exemption) | Notes |
|---|---|---|---|
| Ada County | 0.64% | $1,440 | Includes Boise/Meridian; most populous county. |
| Canyon County | 0.61% | $1,372 | Includes Nampa/Caldwell; rapidly growing. |
| Kootenai County | 0.45% | $1,012 | Includes Coeur d’Alene; very low effective rate. |
| Bonneville County | 0.70% | $1,575 | Includes Idaho Falls. |
| Twin Falls County | 0.91% | $2,047 | Higher effective rate for Magic Valley hub. |
| Bannock County | 0.85% | $1,912 | Includes Pocatello (ISU). |
| Madison County | 0.84% | $1,890 | Includes Rexburg (BYU-Idaho). |
| Bonner County | 0.40% | $900 | Includes Sandpoint; lowest rate in the top 10. |
| Bingham County | 0.66% | $1,485 | Includes Blackfoot. |
| Nez Perce County | 1.21% | $2,722 | Includes Lewiston; highest rate in top 10. |
Disclaimer and Methodology
This calculator provides estimates for planning purposes only, based on average levied tax rates. Under Idaho law, property is assessed at 100% of market value. Because exact mill rates vary by specific tax code areas (incorporating city, county, school district, highway, and cemetery levies), this calculator uses historical “effective rates” to provide a highly realistic estimate of actual homeowner burden.
What this calculator does not account for:
- Voter-approved supplemental levies for local school districts, which can cause significant temporary spikes in your property tax bill.
- The exact value of the Homeowner’s Exemption if your home is worth less than $250,000 (in which case, the exemption is exactly 50% of the value, rather than the flat $125,000 maximum).
How to get an accurate estimate:
- Find your home’s Assessed Market Value on your County Assessor’s property search tool.
- Subtract your Homeowner’s Exemption (50% of value, max $125,000) to find your Taxable Value.
- Multiply the Taxable Value by your specific Tax Code Area (TCA) levy rate.
Data sources: Statewide effective rate derived from U.S. Census Bureau ACS 2023. County effective rates, statutory rules, and exemption limits from the Idaho State Tax Commission.
Return to the National Property Tax Calculator to compare Idaho with other states.