Idaho Property Tax Appeals: Fourth Monday of June Deadline
Researched from official Idaho sources · Updated October 2026
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How Idaho Assessment Appeals Work
Idaho appeals start with a written appeal to your county Board of Equalization (BOE). If you lose there, you can appeal to the Idaho Board of Tax Appeals (BTA) or to district court. Idaho Code 63-501A · Idaho Code 63-511
The Deadline: The Fourth Monday of June
Your county must deliver or mail your valuation assessment notice no later than the first Monday in June. The notice has to tell you the assessed market value and your right to appeal to the county board of equalization. Idaho Code 63-308
An appeal of an assessment on the regular property roll must be filed by the end of the county's normal business hours on the fourth Monday of June. The board of equalization may consider an appeal only if it is timely filed. Idaho Code 63-501A
In 2026 that Monday was June 22. In 2027 it is June 28. Two other rolls have their own dates:
- Subsequent property roll (for example, new construction added later): the fourth Monday of November.
- Missed property roll: on or before the day the board of equalization adjourns its January meeting.
How to File With the County
The appeal is made in writing on a form provided by the county board of equalization or the assessor. It must identify you, the property and the reason for the appeal. Idaho Code 63-501A
What Happens After the County Decision
- 30 days. Within 30 days after the BOE decision is mailed or announced at a hearing, you can appeal to the Board of Tax Appeals. You can instead appeal to the district court for your county in the same window. Idaho Code 63-511
- File with the county auditor. The notice of appeal states your grounds and goes to the county auditor, who sends it to the Board of Tax Appeals. Idaho Code 63-511
- No fee, no lawyer required. The BTA says there are no fees to file an appeal and legal representation is not required. Idaho Board of Tax Appeals
- Keep paying. Filing an appeal does not suspend payment of property taxes. Idaho Code 63-511
Burden of Proof
On appeal, the burden is on the party asking for relief to show the valuation is wrong, and a preponderance of the evidence is enough. The burden shifts to the party seeking an increase if the value rose more than 10% over the previous year and the increase came partly from the assessor not using the required equalization methods. Idaho Code 63-511
A Win Carries Forward
If a Board of Tax Appeals decision changes the market value of a property and nobody appeals further, the value is fixed for the year appealed. There is no increase the next year when nothing physically changes, although county-wide trending that applies to a whole class of property still applies. Idaho Code 63-3813
Where Grove Hopper Fits
Grove Hopper is a research tool. We look at your property, flag whether it looks over-assessed and prepare your appeal documents. You review, sign and file them yourself with your county. We are not attorneys, accountants or a tax firm. The free check is at the top of this page.
Pick your county below for its assessor and next date.
Idaho property tax FAQs
What is the deadline to appeal an Idaho property assessment?
The end of the county's normal business hours on the fourth Monday of June. That was June 22 in 2026 and is June 28 in 2027. The board of equalization can consider only a timely appeal.
When does Idaho mail assessment notices?
No later than the first Monday in June. The notice must show the assessed market value and tell you about your right to appeal to the county board of equalization.
How do I file an Idaho property tax appeal?
In writing, on a form from the county board of equalization or the assessor. Identify yourself, the property and the reason for the appeal.
What if the county board of equalization says no?
You have 30 days from the mailing or announcement of the decision to appeal to the Idaho Board of Tax Appeals, or to district court. The BTA charges no filing fee and you do not need a lawyer.
Do I still pay my property tax during an appeal?
Yes. Under Idaho Code 63-511, appealing does not suspend payment of property taxes.
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- https://legislature.idaho.gov/statutesrules/idstat/Title63/T63CH5/SECT63-501A/
- https://legislature.idaho.gov/statutesrules/idstat/Title63/T63CH5/SECT63-511/
- https://legislature.idaho.gov/statutesrules/idstat/Title63/T63CH3/SECT63-308/
- https://legislature.idaho.gov/statutesrules/idstat/Title63/T63CH38/SECT63-3813/
- https://bta.idaho.gov/
Idaho county appeal deadlines on the clock
Live countdown from the deadline each county guide lists. Each row links to the county guide with the official source for that date. Always confirm against the date on your own notice.
| County | Deadline | Status |
|---|---|---|
| Ada County | Jun 28, 2027 | 264 days out |
All 1 Idaho county guides
Grove Hopper is a research tool with reminders and document preparation. We prepare your appeal documents and you review, sign, and file them yourself. We never file or represent anyone, and we are not attorneys, accountants, or a tax firm. Dates and rules here come from the official pages linked above and can change; check your notice and your county's site before you file.
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