Travis Bunn
Founder, AppealDesk · Published March 27, 2026 · Updated August 25, 2026
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Idaho counties mail your valuation assessment notice no later than the first Monday in June under Idaho Code Section 63-308. From there, the clock is short. Your petition to the county Board of Equalization is due on or before the fourth Monday in June, by 5:00 p.m. That is roughly three to four weeks from notice to deadline, one of the tightest and latest-arriving windows of any state in this series, and several counties spell out in plain language that no late forms will be accepted. There is no thirty-day grace period, no automatic extension for mail delays, and no second chance until next year's notice arrives.
Homeowners who pay through escrow often assume that a pending appeal automatically pauses what their mortgage servicer pays the county. It does not. Idaho reassesses every property every year, which means a fresh notice, and a fresh three-to-four-week window, lands in your mailbox every June whether last year's appeal ever got resolved or not. Meanwhile your servicer is running a completely separate clock set by federal escrow law, one that pays whatever bill the county sends based on whatever value currently sits on the roll, appeal pending or not.
Check your property record and relevant sales, then confirm the current local appeal window.
Idaho taxes property at 100% of market value under Idaho Code Section 63-205. There is no fractional assessment ratio standing between your home's value and the tax rate the way some states structure it. If the county says your home is worth $360,000 and comparable sales show it is really worth $320,000, that full $40,000 gap is subject to the tax rate, dollar for dollar. There is no ratio to soften an inflated number, and no ratio to soften a correction either.
The same statute fixes exactly when your home is supposed to be worth that number: 12:01 a.m. on January 1 of the assessment year. That date matters more in Idaho than in most states, because it is also the cutoff for what counts as valid comparable-sales evidence. A sale that closed in February or March, even one that would help your case, is not evidence of what your home was worth on the January 1 valuation date, and an assessor or board can disregard it for that reason alone. Build your evidence packet around sales that closed before January 1, not around the most recent listing that happens to have closed since your notice arrived. That March sale is not wasted, it is simply next year's evidence.
Idaho's appeal path has three possible stops, and one of them is optional even if you never win at the level before it:
The fourth Monday in June deadline and the statewide RESPA rules apply the same way in every county, but filing forms, hearing calendars, and how much paperwork your county board wants up front can differ. Confirm the specifics with your county assessor before you file.
Review the notice, filing instructions, and evidence requirements before ordering a packet.
Federal law, not Idaho law, governs your escrow account. Under Regulation X, 12 CFR 1024.17(c)(3), your mortgage servicer must analyze your escrow account once per computation year, a twelve-month cycle set by your loan, not by the county's assessment calendar. That analysis simply confirms what the servicer actually paid the county and projects what it expects to pay next. It does not ask whether a county board hearing already happened, or whether your case is sitting at the State Board of Tax Appeals waiting for a decision. It pays whatever bill the county sends, built off whatever value is currently on the roll.
Because Idaho reassesses every property every year, this is not a one-year problem. If your county board denies you in July and you escalate to the State Board of Tax Appeals, a new notice with a new number arrives the following June regardless of whether that first case has been decided. Your escrow account can end up funding two full tax cycles at disputed values before either the original dispute or the fresh one resolves.
Say a homeowner in Canyon County gets her notice on the first Monday in June, on a home the assessor lists at Idaho's median, $334,000. At 100% of market value, that is a $334,000 assessed value; at Idaho's 0.63% effective rate, that is roughly $2,104 in annual property tax, or about $175 a month if it were spread evenly. (Rates vary by taxing district, so treat this as illustration, not a quote.) She gathers comparable sales that closed before January 1 and files with the county Board of Equalization before the fourth Monday deadline. The board denies her petition in July. She escalates to the State Board of Tax Appeals within the 30-day window. A hearing does not happen until the fall, and a decision does not arrive until the following spring, nearly a year after her original notice.
Nearly a full extra tax cycle of escrow disbursements at the disputed value, for a case that started with a deadline she hit in about three weeks. That gap is the entire reason this article exists.
Check the taxable value, exemptions, and applicable dates before estimating a possible tax reduction.
Whichever level finally rules in your favor, the mechanics from there are the same. The assessor updates the roll with the corrected value, the county treasurer issues a corrected tax bill or a refund if the disputed amount was already paid, and none of that touches your monthly mortgage payment on its own. Your servicer has to see it. Three federal rules in 12 CFR 1024.17 control what happens next:
If your case went all the way to the State Board of Tax Appeals and took nearly a year, do not assume your servicer is tracking the docket. Nobody in the escrow department is watching your case's hearing schedule for you. The corrected bill from the county is the only document that moves your payment, so keep a copy of the decision and the revised assessment, and send both the moment they arrive.
Ada County, home to Boise, and Canyon County, its faster-growing neighbor to the west, are Idaho's highest-volume appeal jurisdictions. Kootenai County (Coeur d'Alene) and Bonneville County (Idaho Falls) also see substantial appeal volume. The statewide first-Monday-in-June notice date, fourth-Monday-in-June filing deadline, and federal RESPA rules apply everywhere, but filing forms, portals, and local hearing practice differ by county, so confirm procedure with your specific county assessor before you file.
Yes. Your mortgage servicer's annual escrow analysis under 12 CFR 1024.17(c)(3) simply confirms what it already paid the county, and the county bills whatever value is currently on the roll. Idaho's appeal ladder does not pause county billing, so if your case is still open at the State Board of Tax Appeals when your tax bill comes due, escrow pays that bill at the disputed value. The correction only reaches your account after the county updates the roll and your servicer catches it at an analysis.
No. Idaho Code Section 63-205 fixes your assessed value as of 12:01 a.m. on January 1 of the assessment year, so a sale that closed afterward is not evidence of what your home was worth on the date the county actually valued it, even if the sale price would help your argument. Save that sale for next year's notice. It may be exactly the comp you need once the valuation date catches up to it.
No. County boards of equalization treat the fourth Monday in June filing deadline as fixed regardless of when your specific notice physically arrived, and several counties state outright that no late forms will be accepted. If your notice seems to have gone out later than the statewide first-Monday-in-June target, call the assessor's office immediately rather than waiting to see if the date printed on your notice grants you more time. It usually doesn't.
No. Idaho Code Section 63-511 gives you 30 days from the mailing of your county Board of Equalization decision to appeal, and lets you choose between the State Board of Tax Appeals, an informal administrative hearing with no filing fee, or district court directly, which is civil litigation. Most homeowners start with the State Board of Tax Appeals because it is faster and does not require an attorney, but the direct district court route exists if you would rather litigate the value the first time.
The county updates the assessment roll and issues a corrected bill or refund on its side first. That correction reaches your mortgage account only when your servicer processes the new bill, typically at the next scheduled escrow analysis. If that analysis shows a surplus of $50 or more, your servicer must refund it to you within 30 days under 12 CFR 1024.17(f)(2)(i), as long as you are current on the loan.