Ada County Property Tax Rate: What Homeowners Pay in 2026
The Ada County property tax rate is a percentage of a home's taxable value, and the rate differs by area and by year. Here is how to estimate what you would pay.
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You can find the Ada County property tax rate for 2025 at 0.652% on average, which means a home's tax is roughly that percentage of its taxable value [1]. Use that percentage as the starting point for estimating your own bill.
That average is a county-wide figure, and your own bill can land higher or lower. Rates vary by city and taxing district, and the Meridian median effective rate of 0.38% is below the Idaho state median of 0.42% [2].
This article explains how the rate is set, how to estimate your bill, and how the homeowner's exemption changes the result. The figures here come from 2025 and earlier years, so check current rates before you budget.
How is the tax bill calculated from the rate?
Each taxing district sets its own levy rate, and the county multiplies that rate by your property's taxable value to get the tax for that district. [3]
Levy rates are often written as small decimals, which can make the math look odd. A levy rate of .014 means you owe $14 of taxes for every $1,000 of your property's taxable value. [4]
With a levy rate of 1.2231% in 2021, a $200,000 home would owe around $2,446 in property tax. [5]
Your full bill adds up the share from each district, so the rate you see on one line is only part of the total.
What changes the rate from one home to another?
That is above the Idaho state median of 0.42%, but well below the national median of 1.02% [2]. These are different measures, so read the comparison as a broad guide rather than a precise ranking.
Location inside the county also changes what you pay.
The rate is applied to taxable value, not to the sale price you paid. Taxable value is set by the county assessment, so a home bought for more or less than its assessed value is still taxed on that assessed figure. Keep that in mind when you compare the rate with the price of a home.
What does property tax cost at different home values?
The effective rate is the tax divided by the home's value. The rate describes what the home actually pays, which makes it easier to compare homes at different prices than a single tax amount.
You can use the same percentage to estimate a bill for a home at your own price.
Treat the result as a planning figure. It shows the scale of the bill at a given price, so you can see whether the payment fits your monthly budget before you make an offer.
400000 * 0.0044
The product is your estimated annual tax at that price.
Are there costs beyond the basic rate?
Your total property tax bill is not one rate. It can include levies from several taxing districts, such as the city, the county, and school or fire districts, so the combined rate on your property may be higher than any single figure you see quoted. Each district's levy is applied to your property's taxable value, and the resulting amounts are added together [3]. For a closer look, read Arizona property tax rate: what it is and how it works.
Location changes the picture a lot. Across Idaho, the statewide average urban tax rate is 1.327%, while the rural rate is 0.893% [6]. For a homeowner, that gap means a house inside city limits can carry a heavier percentage than a rural parcel with the same value.
Say two homes have the same taxable value. The one inside city limits may pay levies from more districts than the rural one, so its bill can come out higher even though the value is identical. Use the statewide averages only as a sense check, because the districts that serve your address decide your real number.
To see your actual figure, compare your bill with the county treasurer's calculation page. Work through the same steps using your property's taxable value and the levies on your bill. If your result does not match what you were charged, the district levies are the first place to look. For more detail, see Is Boise ID a Good Place to Live? A Balanced Look.
How can you estimate your own bill?
Your estimate is your property's taxable value multiplied by your taxing district's levy rate. You can work it out in three steps using numbers from your own paperwork.
- Find your property's taxable value on your assessment notice or in the county record. This is the figure the tax is applied to, which may differ from your purchase price.
- Multiply the taxable value by the levy rate of your taxing district, written as a decimal. The district levy rate is multiplied by your property's taxable value to determine the tax amount for the taxing district [3].
- Compare the result with your bill from the county treasurer. A close match means your inputs are right. A large gap usually means your parcel falls in more than one taxing district, so repeat the multiplication for each district and add the results.
If your total matches the bill, you have the right inputs for the next year's estimate.
Common questions about Ada County property tax
Is the Ada County rate the same as the Boise rate?
No. The Boise levy rate differs from the county average, so a Boise bill will not match the county figure. The City of Boise publishes its own levy rates on its Property Taxes page [4]. Use that page when you compare a Boise home with the county number.
Is the rate the same for every home?
No. Your rate depends on the taxing districts that cover your property and on the area where it sits, so two homes in Ada County can pay different rates. In Meridian, the median effective property tax rate is 0.38%, which is lower than the Idaho state median of 0.42% and the national median of 1.02% [2]. That gap shows how much location can change the effective rate. You may also find this useful: Alaska property tax rate: how it works and what owners pay.
Where can you find the levy rate for your own home?
Start with the City of Boise property tax page, which lists the city's levy rates [4]. Find the districts that apply to your address, since the total rate is built from those districts. Your county tax bill shows which districts apply to your parcel. For the next step, see Is Boise a Buyers or Sellers Market? What the Data Shows.
What should you take away about the Ada County rate?
The main point is that Ada County's property tax is a percentage of taxable value, averaging 0.652% in 2025 [1]. That average is a starting point, not your exact number, because your bill depends on your taxing district.
Then confirm current rates on the county treasurer's website before you make a decision, and use that figure in your budget.