Idaho homeowners pay a median of $2,038 a year in property tax, an effective rate of 0.49%, the 45th highest of the 51 states we cover. The deadline to appeal: 4th Monday of June (county BOE). Here is who sets your value, how to challenge it and what evidence works.
Closed for 2026The 2026 appeal deadline for regular assessment notices passed on June 22, 2026, and county board decisions came out in July. Notices for 2027 go out by June 7, 2027, and the next appeal deadline is June 28, 2027. If you got a later notice for new construction or newly found property, a later deadline applies; check your notice.
File your appeal with the County Board of Equalization by the end of the county's normal business hours on the fourth Monday of June. In 2026 that was Monday, June 22. Most counties take appeals at the county commissioners' office (the clerk), not the assessor. A mailed appeal counts as filed on the post office postmark date; a postage-meter mark does not count. The board cannot hear a late appeal. Example: Ada County required appeal forms at the Board of Ada County Commissioners, 200 W. Front St., Boise, by 5:00 p.m. on the fourth Monday of June (June 22, 2026). Ada accepts email, mail, hand delivery or fax; some counties, such as Kootenai, do not accept email or fax. Different deadlines apply to new construction and property added later in the year: the fourth Monday of November for the subsequent roll, and 28 days from the notice for the occupancy roll (newly built and occupied homes).
The assessor mails (or emails, if you asked for it) a valuation assessment notice by the first Monday in June (June 1 in 2026). It shows your market value for this year, the dates of local budget hearings and meetings, and your right to appeal to the County Board of Equalization. Check your notice for any other details that apply to your property.
Where you file depends on your county. Pick yours for the office contacts, local tax figures and a step-by-step guide.
Enter the market value on your assessment notice and what you think the home would really sell for. We estimate the yearly saving if the board agrees with you.
Some states cap how fast the taxable value of a home can rise (California, Florida, Michigan and Texas homesteads, for example). If your taxable value is already held below market value by a cap, a lower market value may not lower this year's bill.
The county assessor values all property in the county. The county commissioners, sitting as the County Board of Equalization, hear appeals. Homes are assessed at 100% of market value as of January 1, minus any exemptions. State law requires the median ratio of assessed value to market value to fall between 90% and 110% for each category of property tested. Values are updated every year. Each year the assessor reappraises part of the county and adjusts (indexes) the rest using sales. Every property must be reappraised at least once every five years.
Call or visit the county assessor's office and talk with the appraiser for your area before you appeal. Many disputes are settled this way, for example by fixing square footage or condition errors or by showing recent sales. Talking to the assessor does not count as an appeal: if you do not settle, you must still file with the County Board of Equalization by the fourth Monday of June.
What works in Idaho: Sales of similar nearby homes that closed before January 1 of the tax year (for a 2026 appeal, sales before January 1, 2026); A recent appraisal, or your purchase price if you bought recently in a normal sale; A real estate agent's comparative market analysis; Photos and repair estimates showing damage, deferred maintenance or other condition problems; Corrections to the assessor's property record (square footage, rooms, finished basement, outbuildings); Assessed values of similar neighboring homes, to show yours is out of line.
Fill out your county's appeal form. Each county provides its own form, and it must identify you, the property and your reason for appealing (Idaho Code 63-501A). Attach a copy of your assessment notice. Give the value you think is right and why, plus your evidence. File it with the county commissioners' office or clerk by the deadline. The board schedules a short hearing, usually between late June and the second Monday of July (July 13 in 2026), when it must finish. You can appear in person, and some counties allow phone or written-only hearings. The assessor or a deputy also attends. The board can raise or lower the value. It sends its decision by mail or announces it at the hearing. Cost: No fee appears on the county appeal forms or pages checked (Ada, Bannock, Kootenai). Confirm with your county before filing.
You must prove the assessor's value is wrong. At the county board, the board of tax appeals and district court the standard is a preponderance of the evidence, meaning your evidence must be more convincing than the county's. Since 2025, the burden flips to the county if your value rose more than 10% from the year before and the increase came partly from the assessor not using required equalization methods.
30 days after the County Board of Equalization mails its decision or announces it at the hearing. File a Notice of Appeal with the county clerk/auditor (not with the BTA directly). The clerk sends it, with the county board's record, to the BTA. Use the BTA's Notice of Appeal form, with a separate notice for each parcel, and attach your assessment notice and your value claim. A mailed appeal counts on the postmark date (a postage-meter mark does not count). There is no filing fee at the BTA. A hearing is typically scheduled within 90 days after the appeal is perfected. Hearings are normally held by a single presiding officer (a board member or staff hearing officer), and in-person hearings are preferred. Bring one original and two copies of each exhibit. Instead of the BTA, you can appeal to the district court in your county within the same 30 days. BTA decisions can be appealed to district court.
A lower county board value is used for that year's tax bill. If the Board of Tax Appeals or a court lowers the value after you have paid, you should get the extra tax back; ask your county treasurer how refunds work. If the Board of Tax Appeals changes your value, that value stays fixed for the next year too (unless the home physically changes; countywide trending still applies). Otherwise the assessor sets a new value every year.
The county board's job is to make sure your home is valued at market value, so sales evidence matters most. You can point to similar homes assessed lower, and state law requires uniform assessment. Since 2025, if your value jumped more than 10% partly because the assessor did not use the required equalization methods, the county has to prove its value at the Board of Tax Appeals. This works only in limited cases. Run the numbers with our unequal assessment calculator.
Most wins start with a mistake in the assessor's record of your home. Check it line by line.
Record card checklistAn exemption is separate from an appeal: you apply once and it cuts your taxable value every year. Check you have every one you qualify for.
If the home is your primary residence, half of the value of the home and up to one acre of land is exempt, up to $125,000. Apply once with your county assessor, by the last business day of the year to get it for that year. It lasts until you sell or move.
Cuts property tax on your home by $250 to $1,500 if you are 65 or older, blind, widowed, disabled, a former prisoner of war or hostage, or a motherless or fatherless child under 18, and your income is under the limit ($40,030 for 2027, based on 2026 income). Apply every year with the county assessor, January 1 to April 15.
Reduces property tax on your home by up to $1,500, with no income limit, if you are a veteran with a 100% service-connected disability or 100% compensation for individual unemployability. Apply every year with the county assessor, January 1 to April 15.
You can file and present your appeal yourself. Ada County says only the property owner may file an appeal, and rules on who may present your case at a county hearing vary, so check your county. At the Board of Tax Appeals you may have a representative, listed on the Notice of Appeal. An out-of-state attorney must also have Idaho local counsel.
Fill in your details and download a written appeal statement as a PDF or Word file. Most boards also require their own appeal form: file the form and attach this letter and your evidence to it.
Tax Appeal Map is a free information site, not a law firm or appraiser. The letter is a template, not legal advice.
File your appeal with the County Board of Equalization by the end of the county's normal business hours on the fourth Monday of June. In 2026 that was Monday, June 22. Most counties take appeals at the county commissioners' office (the clerk), not the assessor. A mailed appeal counts as filed on the post office postmark date; a postage-meter mark does not count. The board cannot hear a late appeal. Example: Ada County required appeal forms at the Board of Ada County Commissioners, 200 W. Front St., Boise, by 5:00 p.m. on the fourth Monday of June (June 22, 2026). Ada accepts email, mail, hand delivery or fax; some counties, such as Kootenai, do not accept email or fax. Different deadlines apply to new construction and property added later in the year: the fourth Monday of November for the subsequent roll, and 28 days from the notice for the occupancy roll (newly built and occupied homes).
With the County Board of Equalization (BOE) appeal. Fill out your county's appeal form. Each county provides its own form, and it must identify you, the property and your reason for appealing (Idaho Code 63-501A). Attach a copy of your assessment notice. Give the value you think is right and why, plus your evidence. File it with the county commissioners' office or clerk by the deadline. The board schedules a short hearing, usually between late June and the second Monday of July (July 13 in 2026), when it must finish. You can appear in person, and some counties allow phone or written-only hearings. The assessor or a deputy also attends. The board can raise or lower the value. It sends its decision by mail or announces it at the hearing.
No fee appears on the county appeal forms or pages checked (Ada, Bannock, Kootenai). Confirm with your county before filing.
Call or visit the county assessor's office and talk with the appraiser for your area before you appeal. Many disputes are settled this way, for example by fixing square footage or condition errors or by showing recent sales. Talking to the assessor does not count as an appeal: if you do not settle, you must still file with the County Board of Equalization by the fourth Monday of June.
You can appeal to the Idaho Board of Tax Appeals (BTA) or district court. 30 days after the County Board of Equalization mails its decision or announces it at the hearing. File a Notice of Appeal with the county clerk/auditor (not with the BTA directly). The clerk sends it, with the county board's record, to the BTA. Use the BTA's Notice of Appeal form, with a separate notice for each parcel, and attach your assessment notice and your value claim. A mailed appeal counts on the postmark date (a postage-meter mark does not count). There is no filing fee at the BTA. A hearing is typically scheduled within 90 days after the appeal is perfected. Hearings are normally held by a single presiding officer (a board member or staff hearing officer), and in-person hearings are preferred. Bring one original and two copies of each exhibit. Instead of the BTA, you can appeal to the district court in your county within the same 30 days. BTA decisions can be appealed to district court.
A lower county board value is used for that year's tax bill. If the Board of Tax Appeals or a court lowers the value after you have paid, you should get the extra tax back; ask your county treasurer how refunds work. If the Board of Tax Appeals changes your value, that value stays fixed for the next year too (unless the home physically changes; countywide trending still applies). Otherwise the assessor sets a new value every year.
Checked 2026-10 against official Idaho sources. Local deadlines and fees can differ; confirm with your assessor or board.