Property taxes in the Boise area, known locally as the Treasure Valley, work the same way across Idaho: local taxing districts set the rates, and your bill is based on your home's assessed value. When you buy, the property tax line is part of the monthly payment you should plan for, alongside principal, interest, and insurance.
How the assessment works
Each year the county assessor sets an assessed value for your home, typically based on recent sales of comparable properties. That value is not the price you paid or the market value on a given day, but the county's estimate for tax purposes. If you believe the assessment is wrong, you have the right to appeal it through the county process.
How the levy works
The tax rate, called a levy, is set by the local taxing districts that serve your address: the county, the city, the school district, and other districts. Your annual tax is the assessed value multiplied by the levy, after any exemptions you qualify for. Because each address falls into different districts, rates vary across the area, which is why two similar homes can carry different tax bills.
The homeowner's exemption
Idaho gives owner-occupants a homeowner's exemption: you may exempt 50% of your home's value, up to $125,000, whichever is less, by applying through your county assessor (Idaho State Tax Commission, tax.idaho.gov/taxes/property/homeowners/exemption/). The exemption applies to your primary residence, and you must apply to claim it. The Ada County Assessor's office has the application and details at adacounty.id.gov/assessor/tax-relief-programs/homeowners-exemption/.
Planning for the tax line
When we estimate your monthly payment, property taxes are part of it, and lenders typically collect them into escrow and pay the bill for you. The exact number depends on the assessed value at the time and your levy area, so I help you confirm the current figure for the homes you are considering rather than guessing.
Sylvia's Advice
Property taxes are a line item you should know before you shop, not discover after you close. When we look at homes, I ask about the current tax bill on each property and we build the real monthly cost, taxes included, into your budget. If you are buying a newly built home, expect the first reassessment to change the tax figure, sometimes noticeably, because the assessed value catches up to the purchase price. Ask me about the tax picture for any home you are serious about, and I will help you confirm the number with the right county records before you commit.
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