Idaho — Tax Residency Rule

Summary

Day threshold

More than 270 days in Idaho

Window

Calendar year (1 Jan – 31 Dec)

Also required

A permanent place of abode in Idaho

Effect

Statutory (full-year) Idaho resident

If you are not domiciled in Idaho, you still become an Idaho statutory resident for tax purposes when both things are true in a calendar year: you keep a permanent home in the state and you are physically present there for more than 270 days. Stay at or under 270 days, or keep no Idaho home, and you avoid statutory residency — so 270 days is the ceiling to watch. Statutory residence means Idaho taxes your worldwide income.

Who it applies to

This matters most if you are:

• A remote worker or frequent traveler who spends long stretches of the year in Idaho.
• Someone who keeps a second home or family home in Idaho while living or working elsewhere.
• A part-year mover who establishes or abandons an Idaho home partway through the year.

The rule turns on physical presence and available housing, not on citizenship or visa status. Note that people who are already domiciled in Idaho are residents by domicile and never need the 270-day test at all.

The rule — and why it exists

The Idaho State Tax Commission treats you as an Idaho resident if either is true for the year:

• Domicile. Idaho is your true, fixed, permanent home — the place you intend to return to — for the entire year; or
• Abode + days (the statutory-resident test). You maintain a permanent place of abode in Idaho and spend more than 270 days of the year in the state.

The 270-day test only bites when both parts of the second route are present. A permanent place of abode is a dwelling you keep available for year-round use — an owned or rented home, not a hotel or short-term holiday let.

Why it exists: states use a combination of physical presence and a permanent home as proxies for where your economic life really sits. The two-part test stops someone from keeping a full-time base in Idaho while claiming to be a non-resident purely by disputing their domicile.

Counting the days

Idaho totals your physical presence across the whole calendar year. In practice:

1. 1Count every day, or part of a day, that you are physically present in Idaho.
2. 2Add up the qualifying days between 1 January and 31 December — they need not be consecutive.
3. 3More than 270 days combined with an Idaho abode makes you a statutory resident; 270 or fewer does not.
4. 4Because a partial day generally counts, keep contemporaneous travel records if you are near the limit.

Examples

Example 1 — statutory resident by days

You own a home in Boise and stay there for about 300 days this year while working remotely. You keep a permanent abode and exceed 270 days, so you are an Idaho statutory resident and Idaho taxes your worldwide income.

Example 2 — over 270 days but no Idaho home

You spend 285 days in Idaho but live entirely out of short-term rentals and never keep a year-round dwelling available to you. Because you have no permanent place of abode in the state, the day count alone does not make you a statutory resident.

Example 3 — Idaho home but few days

You keep a furnished cabin in Idaho but are there only ~120 days a year, and Idaho is not your domicile. You fall short of 270 days, so the statutory-resident test is not met and you are not a full-year resident on that basis.

Exceptions & edge cases

• Domicile overrides the day count. If Idaho is your domicile, you are a resident even if you spend far fewer than 270 days there in a given year.
• Part-year moves. If you establish or abandon Idaho domicile mid-year, you are generally a part-year resident, taxed on Idaho income for the part of the year you lived there, rather than a full-year statutory resident.
• The abode must be genuinely available. A property you have fully let to tenants and cannot use yourself generally is not a permanent place of abode for you.

Common misconceptions

• "Under 270 days means I owe Idaho nothing." False — if Idaho is your domicile you are a resident with any number of days.
• "More than 270 days automatically makes me a resident." False — without a permanent place of abode in Idaho, the day count alone does not trigger statutory residency.
• "Only my Idaho income is taxed." A statutory resident is taxed on income from all sources, the same as a domiciled resident.

Frequently asked questions

Sources

• Idaho State Tax Commission — Guidance for specific circumstances of residency
• Idaho State Tax Commission — Residency status