Ada County, Idaho Property Taxes
Property Taxes in Ada County, Idaho
Median Ada County effective property tax rate: 0.46%, significantly lower than the national median of 1.02%.
Median Ada County home value: $454,500
Median annual Ada County tax bill: $2,170, lower than the national median property tax bill of $2,400.
How are property taxes in Ada County calculated?
Property taxes in Ada County are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.
Understanding your county's property tax system, exemptions, and reduction opportunities can lead to significant savings. Whether you live in Boise or another part of Ada County, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Ada County, Idaho Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
0.46%
Estimate Property Tax Bill
$2,091
$1,940
How Does the Ada County Property Tax Calculator Work?
Use this Ada County property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Ada County's median effective tax rate of 0.46% to generate your estimate.
Enter your property's estimated assessed value — the figure the appraisal district assigns for tax purposes, which is typically lower than market value after applicable exemptions. Our calculator uses the median effective rate for a more accurate estimate than the statutory millage rate alone.
Ada County's median effective tax rate is lower than the National Median Property Tax Rate of 1.02% and higher than the state median tax rate of 0.42%. The county's median property tax bill is $2,170, which is lower than the National Median Property Tax Bill of $2,400 and $230 lower than the state median bill.
Your actual bill may vary based on your specific exemptions, local school district levies, and any special assessment districts that apply to your property.
For a more precise estimate, scroll down to explore city and ZIP code-level tax rate trends across Ada County.
Property Tax Rates Across Ada County, Idaho
What Are Effective Property Tax Rates Across Ada County?
Local government entities set tax rates, which vary widely across Ada County. Each year, the county estimates its budget for public services and divides that total by the assessed value of all taxable property within its jurisdiction.
Below, compare Ada County's effective property tax rate to other counties in Idaho or the U.S. median of 1.02%.
Ada County's median effective rate stands at 0.46%, which is lower than the national median of 1.02%. Within Ada County, the highest rate is found in Boise at 0.59%, while Garden City has the lowest at 0.52%.
These variations reflect differences in local school district levies, special assessment districts assessments, and special district bonds — which compound the base county rate.
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Ada County Tax Rate
0.46%
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Idaho Tax Rate
0.42%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Ada County, Idaho
| City | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Boise | 0.35% | 0.47% | 0.59% | 0.74% | 0.92% |
| Eagle | 0.24% | 0.27% | 0.31% | 0.40% | 0.44% |
| Garden City | 0.29% | 0.36% | 0.52% | 0.64% | 0.89% |
| Kuna | 0.32% | 0.36% | 0.40% | 0.46% | 0.60% |
| Melba | 0.22% | 0.27% | 0.34% | 0.40% | 0.44% |
| Meridian | 0.31% | 0.34% | 0.38% | 0.43% | 0.52% |
| Nampa | 0.31% | 0.35% | 0.37% | 0.41% | 0.47% |
| Star | 0.17% | 0.26% | 0.29% | 0.34% | 0.48% |
Source: Ownwell
Property Tax Assessment Values Across Ada County, Idaho
When examining property taxes in Ada County, understanding the distinction between "market value" and "assessed value" is crucial.
The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Ada County Assessor estimates the market value for tax purposes.
The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.
Assessment notices:
In Ada County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of June.
Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Ada County.
For example, the median tax bill in Ada County is $2,170, with tax bills ranging significantly across the county. Eagle has the highest median home price at $738,900.
Median Ada County Market Value
$454,500
Median Idaho Market Value
$389,309
Median United States Market Value
$235,294
Property Tax Assessment Values Across Ada County, Idaho
| City | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Boise | $312,300 | $361,100 | $436,200 | $569,800 | $764,400 |
| Eagle | $412,560 | $522,100 | $738,900 | $1,039,500 | $1,459,980 |
| Garden City | $257,300 | $343,400 | $478,350 | $670,200 | $931,990 |
| Kuna | $293,700 | $332,250 | $389,200 | $478,400 | $601,780 |
| Melba | $195,840 | $280,325 | $363,150 | $487,700 | $719,310 |
| Meridian | $342,400 | $386,400 | $462,400 | $589,900 | $732,900 |
| Nampa | $382,400 | $528,550 | $732,900 | $986,450 | $1,246,900 |
| Star | $252,560 | $397,600 | $498,100 | $649,650 | $813,600 |
Source: Ownwell
Property Tax Bills Across Ada County, Idaho
Property tax bills in Ada County are based on the assessed value of a home, not its market price alone, and the local tax rate is applied to that value to determine the final bill. For homeowners, this means the amount owed can change when a property’s assessed value changes, even if the home is not sold. Factors such as location, property characteristics, and local taxing jurisdictions all play a role in the calculation.
With a median home price of $454,500, property taxes can vary widely across the county. The 25th percentile tax bill is $1,552, while the 75th percentile reaches $3,170. At the higher end, the 90th percentile tax bill is $4,837. Median tax bills also differ by city, from $1,229 in Melba to $2,822 in Nampa. For many homeowners, these differences make it important to understand how assessments affect annual property tax costs.
Median Ada County Tax Bill
$2,170
Median Idaho Tax Bill
$1,726
Median United States Tax Bill
$2,400
Property Tax Bills Across Ada County, Idaho
| City | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Boise | $1,304 | $1,786 | $2,553 | $3,825 | $5,761 |
| Eagle | $1,131 | $1,630 | $2,339 | $3,436 | $5,163 |
| Garden City | $942 | $1,503 | $2,568 | $3,670 | $4,771 |
| Kuna | $948 | $1,214 | $1,617 | $2,116 | $2,649 |
| Melba | $504 | $846 | $1,229 | $1,741 | $2,587 |
| Meridian | $1,091 | $1,406 | $1,863 | $2,417 | $3,049 |
| Nampa | $1,258 | $1,960 | $2,822 | $3,714 | $4,767 |
| Star | $569 | $1,018 | $1,504 | $2,130 | $2,652 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | June 22 |
Links | |
|---|---|
| Ada Tax Assessor | |
| Website | apps.adacounty.id.gov |