Updated September 5, 2026. Quick answer: Idaho’s deferral opens to a wide range of applicants beyond age 65; disability, blindness, widowhood, POW status; charges around 6% interest for 2026, and its statute contains the single most explicit denial of lien seniority in this family: it says outright the deferral lien ‘shall not be a first and prior lien.’
A wider eligibility gate than most states
Idaho’s Property Tax Deferral Act, Idaho Code §§63-712 through 63-721, piggybacks its eligibility categories on the state’s Property Tax Reduction statute, §63-701: not just 65 or older, but also an orphaned or abandoned minor under 18, a widow or widower, someone disabled under Social Security, Railroad Retirement, or federal civil-service standards, a disabled veteran with at least a 10% service-connected rating or a non-service-connected pension, a former prisoner of war or hostage, or someone legally blind; a considerably wider door than the simple age-62-or-65 gate most states in this family use. On top of that base eligibility, household income cannot exceed $61,674 for 2025 (a figure indexed annually from a $50,000 base set for 2021), the home cannot carry a reverse mortgage or HELOC, and total encumbrances including any prior deferred tax cannot exceed 80% of current market value.
About 6% interest, and the most explicit lien-priority denial in this family
Interest is set by a formula, not a flat number: 2 percentage points above the federal midterm applicable rate, reset annually; the Idaho State Tax Commission’s own current application form states the resulting figure directly as 6% for 2026. What sets Idaho apart is the bluntness of its lien statute: rather than leaving priority to be inferred from silence or a general date-based rule, the code states in so many words that the deferred-tax lien ‘shall not be a first and prior lien,’ but instead takes its priority from the date its notice of lien is filed; meaning any mortgage recorded earlier keeps its senior position, and Idaho’s legislature chose to say so explicitly rather than let a reader infer it.
When it comes due, and how to apply
The balance becomes due on voluntary full payment, the death of the qualified claimant or the last surviving one, a sale or other transfer of title (except to a surviving spouse), the property no longer qualifying for Idaho’s Homeowner’s Exemption, or a State Tax Commission finding that the deferral was granted in error; with 180 days to pay once any of those trigger. Applications go to the county assessor, signed and notarized, no later than the first Monday in September; the Idaho State Tax Commission’s own 2026 form gives the concrete date as September 8, 2026; and must be refiled every year.
Idaho’s broader senior property-tax picture, covering exemptions, freezes and circuit-breaker credits, not just the deferral: property tax breaks for seniors in Idaho.
How every state’s programme compares: property tax relief for seniors by state. What a deferral means in general, and who it catches out: the property-tax deferral lien trap.
Statutory text read at each state’s own legislature, revisor, or revenue agency this session. General information, not tax or legal advice; rates, caps and thresholds change most years and a county or state agency retains the final say on your own application.