Idaho local data guide

Understanding Property Tax Rates in Ada County for Boise Homeowners

There is no single, flat property tax rate for Boise homeowners. Property tax amounts are determined by the combined levy rates of all specific taxing districts—such as the city, county, school district, and specialized services like fire or library districts—where a property is located. Because these districts vary, tax rates can differ significantly even within the same neighborhood.

Updated with grounded research as of 2026-09-24.

The short answer

Property taxes in Ada County are not set at a single, county-wide rate. Instead, your annual tax bill is calculated by applying the combined levy rates of all the specific taxing districts that provide services to your property—including the City of Boise, Ada County, school districts, and special districts like fire or library services. Consequently, homeowners in different parts of Boise, or even different streets, may have different total tax rates. Tax amounts are calculated based on your property's taxable value as determined by the Ada County Assessor, minus any applicable exemptions like the homeowner's exemption.

Key facts

Tax Calculation Formula
Property taxes are determined by multiplying the taxable value of your property (after exemptions) by the total combined levy rate of your specific taxing districts.
Homeowner's Exemption
As of September 2026, owner-occupied primary residences are eligible for a homeowner's exemption, which reduces the taxable value of the home and up to one acre of land by the lesser of 50% of the assessed value or $125,000.
Annual Levy Increases
Under Idaho law, local taxing districts are generally permitted to increase their property tax budget by up to 3% annually, plus an allowance for growth from new construction and annexation.

How Property Taxes Are Determined

Your property tax bill is a compilation of levies from the various local government entities that serve your address. The Ada County Assessor determines the market value of your property as of January 1 each year. This market value is then adjusted by any applicable exemptions to arrive at your 'taxable value.'

Each local taxing district—such as your school district or fire department—sets a budget that is then divided by the total taxable value of all property within its boundaries to establish its specific levy rate. Your final tax bill is the sum of all these individual district rates applied to your property's taxable value.

Using the Homeowner's Exemption

  • To qualify, you must own and occupy the home as your primary residence.
  • The exemption reduces the taxable value of your home and up to one acre of land.
  • The maximum reduction is $125,000 or 50% of the home's value, whichever is less.
  • You must apply for this exemption through the Ada County Assessor's office to receive the benefit.

Finding Your Specific Tax Information

Because effective tax rates often cited by third-party data providers are merely statistical averages, they should not be used as an accurate gauge for your specific property. To find the exact tax details for your home, use the official parcel search tool provided by the Ada County Assessor.

Property taxes in Ada County are billed annually and can be paid in two equal installments, typically due on December 20 and June 20 of the following year.

Common questions

Are there programs to reduce my property tax if I am on a fixed income?

Yes. Idaho offers a Property Tax Reduction program (sometimes called the 'circuit breaker') for qualified residents, including those who are 65 or older, disabled, widowed, or blind. This program can reduce property taxes on a primary residence by up to $1,500. Eligibility is based on income and requires annual application.

What should I do if I disagree with my property tax assessment?

If you believe the market value assigned to your property by the Assessor is incorrect, you should first contact the Ada County Assessor's office to discuss the valuation. If the issue remains unresolved, you can file an appeal with the Board of Equalization (BOE) through the County Clerk's office by the statutory deadline, which is typically the fourth Monday in June.

Related Idaho questions

  • What is the deadline for filing the homeowner's exemption in Ada County?
  • How do I appeal my property assessment in Ada County?
  • When are property tax installments due in Idaho?

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