When are property taxes due in Ada County, Idaho?

Ada County property taxes are due December 20. A second installment is due June 20. This deadline applies to all counties in Idaho.

What is the penalty for late property tax payment in Ada County, Idaho?

The late payment penalty in Ada County is 2% + 1% per month interest.

How do I pay Ada County, Idaho property taxes?

You can pay Ada County property taxes online through the county payment portal or by mail to the county treasurer.

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Ada County Property Tax Due Date

Name: Ada County Treasurer
Address: 200 W Front St, Boise, ID, 83702, US
Telephone: (208) 287-6800

Idaho

(208) 287-6800

2026 Property Tax Due Dates

Official Source

Installment 1

December 20

Full payment or first half

Installment 2

June 20

Second half (if split)

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Penalty: 2% + 1% per month interestGrace period: None

Payment Methods

Online, Mail, In-Person

🏛️

Idaho Laws That May Affect Your Property Taxes

Idaho recently changed homestead exemption rules and property assessment methods — effective January 1, 2026. See which bills passed and what they mean for your bill.

View on Tally Idaho →

Ada County Treasurer

Phone

(208) 287-6800

taxinfo@adacounty.id.gov

Fax

208-287-6809

Office Address

200 W Front St
Boise, ID 83702

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Mailing Address

PO Box 2868, Boise, ID 83701

Office Hours

Mon-Fri 8am - 5pm

How to Pay

Online

Pay using credit card or e-check

Pay Online →

By Mail

Mail check payable to Ada County Treasurer — PO Box 2868, Boise, ID 83701

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In Person

Visit the Treasurer's office — 200 W Front St, Boise ID 83702, Mon-Fri 8am - 5pm

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Other Counties in Idaho

Adams Bannock Bear Lake Benewah Bingham Blaine Boise Bonner

View all Idaho counties →

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Helpful Guides

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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.