Idaho Commercial Property Tax Appeals
Idaho values every property at market as of January 1, every year. Notices go out by the first Monday in June, and county board appeals close at the end of business on the fourth Monday, three weeks later. A late appeal cannot be heard.
Three weeks to file, and the owner in the room
Idaho assesses at full market value as of January 1, every year, with no assessment ratio and no cap on increases. Assessors must appraise each property at least once every five years and index the rest to the market annually. Notices mail by the first Monday in June, and the county board of equalization takes appeals until the end of business on the fourth Monday: June 7 and June 28 in 2027. The board can hear only a timely appeal.
Who stands up at the county board is set county by county. Ada County (Boise, Meridian) and Kootenai County (Coeur d'Alene) require the owner, or an Idaho-licensed attorney, to sign the appeal and appear; witnesses may testify for the owner. Others, such as Bonner County, accept an agent with the owner's notarized authorization. At the next level, the Idaho Board of Tax Appeals, state law lets the owner choose any representative, and the case is heard fresh: new evidence comes in, and a preponderance of the evidence carries the burden.
The bill floats with the levy. Most local budgets can grow no more than 3% a year plus new construction and annexation, and each levy rate is set to raise its budget from the district's taxable value, so countywide value growth pulls rates down and the properties whose values outrun the rest carry more of the load. For income-producing property, the statute adds a lever few owners pull: on request, the assessor must provide the calculations behind the value.
Every date that matters
Idaho runs on fixed statutory dates. The county board window is about three weeks, and the later deadlines run from each decision, so the calendar starts the day the notice arrives.
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January 1Assessment dateEvery property is valued at market value as of 12:01 a.m. January 1, every year (Idaho Code 63-205). There is no assessment ratio and no cap on increases.
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First Monday in JuneAssessment notices mailed (June 7, 2027)Notices go out no later than the first Monday in June (63-308). They also show the two prior years' values and taxes by district: read this year's number against both.
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Fourth Monday in JuneCounty board appeal deadline (June 28, 2027)A written appeal on the county's form, naming the owner, the property and the reason, is due by the end of the county's business hours (63-501A). A mailed appeal counts by its post office cancellation mark; a postage-meter mark does not (63-217).
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By the second Monday in JulyCounty board hearings (adjourns July 12, 2027)The county commissioners, sitting as the board of equalization, hear appeals and must adjourn by the second Monday in July (63-501). In Ada and Kootenai counties the owner or an Idaho-licensed attorney must appear; witnesses may testify. The board can also raise a value, after notice to the owner (63-506).
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+30 daysBoard of Tax Appeals or district courtWithin 30 days after the county board's decision is mailed or announced at the hearing (63-511), filed through the county auditor. The Board of Tax Appeals hears the case de novo, charges no filing fee, and lets the owner choose any representative (63-3810A). It can raise a value as well as lower it.
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+28 daysDistrict courtA Board of Tax Appeals decision goes to district court within 28 days under Idaho Civil Rule 84 (63-3812), where a judge tries the value anew. A business entity needs a licensed attorney in court.
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Fourth Monday in NovemberSubsequent and occupancy rollsValue added after the main roll is appealed by the fourth Monday in November (63-501A). A newly built commercial building first occupied during the year is taxed on the occupancy roll, and its value can be appealed within 28 days of the assessor's notice (63-317).
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December 20 & June 20Taxes duePay in full by December 20 or in halves by December 20 and June 20 (63-903). An appeal does not suspend payment, and a refund ordered on appeal comes back with interest (63-1305).
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January 1Assessment date and the $250,000 exemptionEach taxpayer's business personal property in a county is exempt up to $250,000 of market value, and items bought since 2013 costing $3,000 or less are exempt outright and left off the list (63-602KK).
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March 15Declaration dueOwners file a sworn list with the assessor (63-302). Without one, the assessor values the property on its own best judgment, and the county board cannot reduce an assessment where the owner refused to file (63-503).
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April 15One-time exemption applicationAn owner whose property in the county totals $250,000 or less files a one-time application by April 15 of the first year; above that, the March 15 declaration serves as the claim (IDAPA 35.01.03.626).
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JuneNotice and appeal, same dates as real propertyPersonal property values arrive on the same notice schedule and use the same fourth-Monday-in-June deadline. Equipment is valued at replacement or reproduction cost less depreciation, not historic cost (63-208), using Tax Commission schedules the Commission itself labels guidelines.
Statutory basis: Idaho Code 63-205 (January 1 market value), 63-314 (five-year appraisal cycle), 63-308 (notices), 63-501 and 63-501A (county board and deadlines), 63-217 (filing by mail), 63-502 and 63-511 (burden of proof and appeals from the county board), 63-3810A (representation at the Board of Tax Appeals), IDAPA 36.01.01 rules 139 and 140 (de novo hearing; power to raise or lower), 63-3812 and Idaho Civil Rule 84 (district court), 63-317 (occupancy roll), 63-903 and 63-1305 (payment and refunds). County appearance rules are from the Ada and Kootenai county appeal forms. Idaho has no law requiring disclosure of sale prices. Personal property: declarations 63-302; exemption 63-602KK ($250,000 per taxpayer per county since 2022); IDAPA 35.01.03.626.
Market value times the levy, and the levy floats
Idaho has no assessment ratio. Taxable value is market value less exemptions, and commercial real estate gets no homeowner's exemption, so the bill is close to market value × the levy rate of the property's tax code area. A $10 million building in Boise (tax code area 01, 0.920% for tax year 2025) pays about $92,000 a year; the same building in Meridian, at 0.451%, pays about $45,000, and in Twin Falls, at 1.074%, about $107,000. Every $1 million cut from a Boise value saves about $9,200 a year.
The rate is an output, not an input. Each non-school district may raise its property tax budget at most 3% over its highest of the prior three years, plus revenue from new construction and 90% of annexed value (Idaho Code 63-802); the levy rate is whatever raises that budget from the district's taxable value. School and voter-approved levies sit outside the cap, and since 2023 state money for school facilities has lowered school levies on every property, commercial included.
For income-producing property, Idaho puts the key rules in writing: the value must exclude exempt intangible personal property, the income approach must use market rent, not contract rent, and on the owner's request the assessor must provide the calculations used to reach the value, including anything exempted (Idaho Code 63-208(3); IDAPA 35.01.03.217). Income figures handed to the assessor stay confidential only if the owner marks the pages as confidential (Idaho Code 74-107).
| Market | 2025 Levy Rate | Tax on $10M of Commercial Value |
|---|---|---|
| Boise (Ada County) | 0.920% | ≈ $92,000 |
| Meridian (Ada County) | 0.451% | ≈ $45,100 |
| Nampa (Canyon County) | 0.668% | ≈ $66,800 |
| Caldwell (Canyon County) | 0.647% | ≈ $64,700 |
| Coeur d'Alene (Kootenai County) | 0.560% | ≈ $56,000 |
| Idaho Falls (Bonneville County) | 0.887% | ≈ $88,700 |
| Pocatello (Bannock County) | 0.989% | ≈ $98,900 |
| Twin Falls (Twin Falls County) | 1.074% | ≈ $107,400 |
Tax year 2025 levies (bills due December 20, 2025 and June 20, 2026) for each city's main tax code area, from the county treasurers' levy tables. Rates differ by tax code area within a city, and the assessment notice shows the property's own: Idaho Falls runs 1.009% inside School District 93, and Meridian's 2025 rate reflects a West Ada school district levy near zero. Statewide averages for 2025 (Idaho State Tax Commission): urban 0.680%, rural 0.423%.
The grounds that actually move bills
Idaho rewards owners who arrive on time, in person where the county requires it, with the assessor's own numbers in hand:
Calendar the three weeks
Notices arrive by the first Monday in June and appeals close at the end of business on the fourth Monday. A mailed appeal counts by its post office cancellation mark, not a postage-meter mark, and a late appeal cannot be heard. The case should be ready before the notice lands.
The owner in the room
Ada and Kootenai counties require the owner, or an Idaho-licensed attorney, to sign and appear at the county board, and witnesses may testify. A consultant can build the case and testify; the owner presents it. A prepared owner with the evidence in writing and a valuation witness alongside is a different hearing from a form letter.
Ask for the assessor's math
On request, the assessor must provide the calculations behind an income property's value, including anything exempted (Idaho Code 63-208(3)). The rent, vacancy, expense and capitalization assumptions in that model are where commercial values are won or lost.
Market rent, and no intangibles
Idaho's rules value income property on market rent, not the rent in the lease, and keep exempt intangible personal property out of the real estate value. On hotels and other operating properties, separating the business from the building is the central question.
A fresh hearing at the state board
The Idaho Board of Tax Appeals hears the case de novo: new evidence comes in, and a preponderance of the evidence carries the burden. It charges no filing fee and lets the owner choose any representative. It can also raise a value, so the case gets tested before it is filed.
A win that holds
A Board of Tax Appeals value that is not appealed further is fixed for that year, and the next year's value cannot rise unless the property physically changes or a countywide trend is applied to its whole class (Idaho Code 63-3813). One hearing can carry into the next tax year.
Common questions
Find out whether your Idaho value holds up
Send the property's address. The request is acknowledged within one business day, and the Initial Consultation ends in a written memo: whether the county's value holds up against the property's own income and the January 1 market, the dollars at stake and the exact fee. If there is no case, the memo says so. Idaho engagements are taken case by case, and the Initial Consultation is offered here the same as in Colorado.
The Initial Consultation carries no fee. Written answer within one week. Or email charlieyoung@svatax.com or call 720-722-2911.
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