Arizona — Nine-Month Residency Presumption

Summary

Statutory trigger

More than nine months of the taxable year

Tracked as

270 days — warns on day 271

Why 270

Shortest nine calendar months = 272 days

Window

Taxable year

Rebuttable

Yes — competent evidence of temporary purpose

Also resident if

Domiciled in Arizona, or present for other than a temporary purpose

Basis

A.R.S. §43-104(19)

Authority

Arizona Department of Revenue

Arizona presumes you are a resident if you spend more than nine months of the taxable year in the state. The statute counts months, not days — so Bounded converts it conservatively. The shortest possible nine calendar months add up to 272 days, so a 270-day cap firing on day 271 always lands at or before the statutory line, in every year. The presumption is rebuttable — and staying under it does not make you a nonresident, because domicile and purpose can make you resident on any number of days.

Who it applies to

This matters most if you are:

• A snowbird or part-year Arizona resident with a second home in Phoenix, Tucson or Scottsdale.
• A remote worker who moved to Arizona mid-year and is unsure which state has the first claim on your income.
• Someone leaving Arizona who still owns property, holds an Arizona licence, or is registered to vote there.
• On a long assignment in-state with a home and family somewhere else.

Arizona residents are taxed on all income from all sources; nonresidents only on Arizona-source income. If your income is portable, the difference is the entire point of the exercise.

The rule — and why it exists

A.R.S. §43-104, in the definition of Resident, gives three routes:

• (a) Purpose. “Every individual who is in this state for other than a temporary or transitory purpose.” No day count.
• (b) Domicile. “Every individual who is domiciled in this state and who is outside the state for a temporary or transitory purpose. Any individual who is a resident of this state continues to be a resident even though temporarily absent from the state.” Again, no day count.
• (c) The nine-month presumption. “Every individual who spends in the aggregate more than nine months of the taxable year within this state shall be presumed to be a resident. The presumption may be overcome by competent evidence that the individual is in this state for a temporary or transitory purpose.”

The Department of Revenue’s own procedure, ITP 92-1, repeats the statutory wording and adds the candid observation that “Arizona statutes do not define the terms ‘temporary’ and ‘transitory’”. It contains no month-to-day conversion of any kind: there is no official day figure for the nine-month test.

Why it exists: the real Arizona test is about purpose — whether your presence is settled or temporary. That is a fact question, and fact questions are expensive to litigate, so the legislature added an evidential shortcut: spend most of the year here and the burden flips to you. It does not replace the purpose test; it just changes who has to prove what.

Counting the days

1. 1The statute counts months "in the aggregate" across the taxable year — the months need not be consecutive.
2. 2Nine months has no fixed length. Taking the nine shortest months of a non-leap year (February plus four 30-day and four 31-day months) gives 272 days; a leap year gives 273.
3. 3Because the trigger is "more than nine months", nothing under 272 days can meet it on any defensible reading.
4. 4Bounded therefore tracks a 270-day cap and fires at 271 — strictly below the shortest nine-month aggregate, so the alarm is always early rather than late.
5. 5Keep the underlying day record anyway. If the presumption is ever raised, contemporaneous evidence of where you were is the thing that decides it.

The 270 figure is Bounded’s conversion, not Arizona’s. We say so plainly because the difference matters: if a dispute ever turns on the exact boundary, the argument is about months on the calendar, not about our number. The same conservative approach is used for Ohio’s contact-period proxy.

Examples

Example 1 — the comfortable snowbird

Ruth spends October through April in Scottsdale — about 210 days — and summers in Minnesota, where her home, doctor and family are. The nine-month presumption never arises, and her domicile is clearly elsewhere. She files as a nonresident on Arizona-source income only.

Example 2 — the presumption rebutted

Marcus takes a ten-month construction contract in Tucson, keeps his Denver house and his family there, and has a written end date. He is past the presumption — but a fixed-term contract, an out-of-state home and a return plan are exactly the competent evidence §43-104(19)(c) contemplates.

Example 3 — under the line and still resident

Priya spends 200 days in Arizona, but she owns her only home in Mesa, votes there, holds an Arizona licence and intends to return between trips. She is domiciled in Arizona and merely temporarily absent, so limb (b) makes her a resident regardless of the count. Staying under 270 buys her nothing.

Exceptions & edge cases

• Domicile beats days. An Arizona domiciliary stays resident while temporarily absent. Ending Arizona residency means ending the domicile — new permanent home, licence, registration, ties — not just spending time elsewhere.
• Part-year residency. If you genuinely move in or out mid-year, Arizona has a part-year resident filing position rather than an all-or-nothing one.
• Credit for taxes paid elsewhere. Arizona residents taxed on the same income by another state can generally claim a credit, so double residency is costly but not always catastrophic. Model it before assuming the worst.
• Military and specific statutory exclusions. Service members and certain other categories have their own residency and sourcing rules that override the general test.
• “Temporary or transitory” is undefined. ITP 92-1 says so expressly. Expect a facts-and-circumstances analysis rather than a bright line.

Common misconceptions

• "Arizona has a 270-day rule." It does not. The statute says more than nine months. 270 is Bounded’s conservative conversion, chosen so the warning always comes early.
• "Arizona is a 183-day state." No. Nine months is far more generous than half a year — but the purpose and domicile limbs are far less forgiving than a day rule.
• "Under the limit means nonresident." False. Domicile or a non-temporary purpose makes you a resident at any day count.
• "A presumption is a conviction." It is not — it can be overcome with competent evidence of a temporary or transitory purpose. But the burden is on you.
• "Idaho also uses 270, so they are the same rule." They are not. Idaho’s 270 is statutory and pairs with maintaining an Idaho home; Arizona’s is our conversion of a months-based presumption. See Idaho tax residency for the contrast.

Questions fréquentes

Sources

• Arizona Revised Statutes §43-104 — Definitions (item 19, "Resident")
• Arizona Department of Revenue — Income Tax Procedure ITP 92-1 (residency) — PDF may require a browser to open
• Arizona Department of Revenue