2026 Property Tax Due Dates
December 20
Full payment or first half
June 20
Second half (if split)
Payment Methods
Online, Mail, In-Person
Ada County Treasurer
Phone
(208) 287-6800Fax
208-287-6809
Mailing Address
PO Box 2868, Boise, ID 83701
Office Hours
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Ada County Treasurer — PO Box 2868, Boise, ID 83701
In Person
Visit the Treasurer's office — 200 W Front St, Boise ID 83702, Mon-Fri 8am - 5pm
About Property Taxes in Idaho
Idaho property taxes are administered at the county level. Property is assessed at 100% of market value as of January 1 each year. Tax bills are typically mailed in October or November, with a December 20 deadline for the full amount or an option to pay in two installments. Idaho offers a meaningful homeowner exemption that exempts half of a home's value from taxation (up to a cap), making it one of the more generous homeowner exemptions in the western United States.
Payment & Assessment
Idaho property taxes are due December 20. You may pay in two equal installments: First installment: Due December 20 Second installment: Due June 20 of the following year Paying by the first installment date is also an option for paying in full. A penalty of 2% per month (up to 12% maximum) applies to late payments. Most counties offer online payment through the county treasurer's website. Contact your county assessor or treasurer for payment options.
Statewide framework for Idaho. Your county's specific rates and deadlines are shown above.
Other Counties in Idaho
About Ada County
Ada County is located in the southwestern part of Idaho, United States. As of the 2020 census, the county had a population of 494,967, which by 2025 was estimated to have risen to 546,141. Ada County is by far the state's most populous county; it is home to 26.8% of the state's population. The county seat and largest city is Boise, which is also the state capital. Ada County is included in the Boise metropolitan area. The Ada County Highway District has jurisdiction over all the local county and city streets, except for private roads and state roads. In the interior Pacific Northwest east of the Cascade Range, Ada County ranks second in population, behind Spokane County, Washington.
Source: Wikipedia — content available under CC BY-SA 4.0
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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.