Idaho property taxes are low by national standards: the Tax Foundation puts Idaho's effective rate on owner-occupied housing at 0.50%, below the national average and well below most of the northeast. But the Idaho system is different enough from most states that new residents and first-time buyers often miss exemptions worth $800–$2,500 per year. This guide walks through the entire system with real Bonneville County numbers.
How Idaho property taxes are calculated
Three numbers drive your property tax bill:
- Market value: what the property would sell for today, as determined by the county assessor. Typically reviewed annually, adjusts based on sales comps in your neighborhood.
- Exemptions: the homeowner's exemption (discussed below) and any other applicable exemptions subtract from market value to get taxable value.
- Levy rate: total rate from your overlapping taxing districts (state, county, city, school district, fire district, etc.). Multiplied by taxable value to get your tax bill.
Example: $450,000 home in Ammon → $125,000 homeowner exemption applied (50% of value, capped at $125,000) → $325,000 taxable value → 0.85% total Ammon levy rate → $2,762/year tax bill.
The Idaho Homeowner's Exemption
This is the single biggest property tax break most Idaho homeowners can claim. It reduces taxable value of your owner-occupied primary residence by 50% of market value, capped at $125,000 (2026 limit, legislature adjusts periodically).
On a $400K home, the first $125K is exempt. At a typical Bonneville County levy rate of ~0.85%, that saves approximately $1,000–$1,100 per year. Over 10 years of ownership, that's $10K+ you keep in your pocket.
How to apply:
- After closing, file Form CG-ROE with your county assessor's office. Available online at each county's website.
- Bring: recorded deed (proves ownership), driver's license showing property as residence, voter registration, and/or utility bill.
- One-time application. The exemption stays on the property as long as you own and occupy it.
- Deadline: File by the last business day of the calendar year. Under 2026 House Bill 843 the exemption is no longer prorated, so it applies in full for that tax year no matter when during the year you file.
Critical note: if you rent out the property (even as a seasonal short-term rental for more than 6 months), the homeowner's exemption does NOT apply. Investment and rental properties are taxed at full market value.
2026 property tax rates by county (approximate)
Levy rates, and what a $400,000 owner-occupied home actually pays
| County | Rate Range | On $400K Home* |
|---|---|---|
| Bonneville (Idaho Falls, Ammon) | 0.65%–0.85% | $1,790–$2,340 |
| Madison (Rexburg) | 0.55%–0.75% | $1,510–$2,060 |
| Jefferson (Rigby) | 0.60%–0.80% | $1,650–$2,200 |
| Fremont (St. Anthony, Island Park) | 0.50%–0.70% | $1,380–$1,920 |
| Bingham (Shelley, Blackfoot) | 0.55%–0.75% | $1,510–$2,060 |
*Levy rate applied to taxable value after the homeowner's exemption (50% of value, capped at $125,000). A $400,000 owner-occupied home is taxed on $275,000.
Within each county, rates vary significantly based on which city + school district + special taxing districts your property sits in. Always check the specific parcel tax history before assuming, we pull this for every property our buyers consider.
Circuit Breaker relief for seniors and disabled
Idaho's Property Tax Reduction Program (commonly called "Circuit Breaker") offers additional property tax relief beyond the homeowner's exemption for qualifying homeowners. In 2026, the maximum benefit is approximately $1,500/year reduction in property taxes on a primary residence.
Who qualifies:
- Age 65 or older
- Widow or widower of any age
- Blind
- Disabled (Social Security-defined disability)
- Former POW or hostage
- Fatherless or motherless minor child
Income limits:
Applicants must have 2025 income, after deducting medical expenses, of $39,130 or less to qualify in 2026 (the limit adjusts annually). This is a meaningful limit, many retirees with Social Security + modest pension qualify.
Apply between January 1 and April 15 each year with your county assessor. Idaho processes the application and applies the relief to your tax bill.
Veterans: a separate benefit, with no income limit
Idaho runs a distinct Property Tax Benefit for Veterans with Disabilities, and it is easy to miss because it does not sit under the Circuit Breaker. It requires a 100% service-connected disability rating (or 100% compensation for individual unemployability) as of January 1, and it is worth up to $1,500 on your home and up to one acre. Critically, there is no income limit. Apply between January 1 and April 15; if your rating is permanent and total it renews automatically. Do not confuse this with the 10% rating that waives the VA loan funding fee, which is an unrelated program.
Property tax on new construction
If you're buying a newly-built home, your first-year tax bill may be lower than expected because the home was partially complete on January 1 (the assessment date). The second full year typically brings a significant increase, a "true" assessment of the finished home.
Plan for this: when budgeting for a new-construction purchase, use an estimated property tax based on the purchase price × 0.70% (effective rate after exemption) as your ongoing monthly escrow. Your lender may initially estimate lower, ask them to use the full assessed value estimate to avoid escrow shortages in year 2.
How to appeal your assessment
County assessors mail assessment notices each June. If your assessed value seems too high, you have until the fourth Monday in June to file an appeal with the county Board of Equalization.
When appeals are worth filing:
- Assessed value is 5%+ above recent sale price (if you bought recently)
- Comparable recent sales on your street show lower values
- Property has condition issues (foundation, roof, flooding history) not reflected in assessment
- Assessor made a factual error (wrong square footage, wrong bed/bath count, wrong year built)
How to file:
- Request the basis for your assessment. The assessor must provide comps used
- Pull 3–5 recent sold comps that support your case
- Take photos of any condition issues
- File formal appeal at your county assessor's office
- Present to Board of Equalization (usually a brief 10-minute meeting)
Appeals that come with real comp evidence succeed more often than not. We've helped clients reduce assessed values by 5–12%, which translates to real annual tax savings.
Frequently Asked Questions
What are property tax rates in Idaho Falls?
Levy rates in Bonneville County run about 0.65%–0.85% of taxable value. After the homeowner's exemption a $400,000 owner-occupied home is taxed on $275,000, so roughly $1,790–$2,340/year. Lower rates in Madison and Fremont counties.
What is the Idaho homeowner's exemption worth?
Reduces taxable value by 50% of market value up to $125K (2026 cap). Saves $800–$1,100/year on a typical $400K Idaho Falls home. Apply with county assessor after closing, by April 15.
Who qualifies for Circuit Breaker relief?
Seniors 65+, widows/widowers, blind, disabled, former POWs, and fatherless or motherless minors. For 2026, 2025 income after medical deductions must be $39,130 or less. The benefit is $250–$1,500. Apply January 1 to April 15. Veterans with a 100% service-connected disability rating qualify under a separate program with no income limit.
When are Idaho property taxes due?
Paid in arrears. Two installments: half due December 20, half June 20 the following year. Most mortgages escrow monthly.
Can I appeal my Idaho property tax assessment?
Yes. File appeal with county Board of Equalization by the fourth Monday in June. Worth doing if assessed value is 5%+ above true market value with comp evidence to support.
Get a property-specific tax analysis
For any SE Idaho property you're considering, we'll pull the full tax history, applicable levy rate, and projected taxes under your ownership. Free, no obligation. Text Grant at (208) 499-4016 or email SR@Two70.com.
Ready to Make Your Move in Southeast Idaho?
Property tax surprises are avoidable. Call us before you close and we will tell you what your actual bill will look like.
Search All SE Idaho Homes