US State Residency: The 183-Day Rule Inside the States
How states like New York and California use domicile and statutory-residence tests, why day counts matter for snowbirds and remote workers, and how to document a move.
Federal residency is only half of the US picture. Each state with an income tax has its own residency rules, and the most aggressive ones combine domicile (your true, permanent home) with a statutory residence test based on days.
Two ways to be a state resident
- Domicile. The place you intend to make your permanent home. You keep it until you establish a new one — it does not lapse because you travel. Changing domicile needs both physical relocation and intent, shown by actions.
- Statutory residence. Many states treat you as resident if you maintain a permanent place of abode there and spend more than 183 days there, even if you are domiciled elsewhere. New York is the best-known example.
New York
New York treats you as a statutory resident if you maintain a permanent place of abode in the state for substantially all of the year and spend more than 183 days there. Any part of a day generally counts as a New York day, with narrow exceptions such as in-transit travel and certain medical stays. New York City applies a parallel test for its own income tax.
California
California uses a "closest connection" approach: residents include those in the state for other than a temporary or transitory purpose. There is a presumption of residency for those in the state more than nine months in a year, and a safe harbour for some employment-related absences. Days are evidence, not the whole test.
Snowbirds and remote workers
If you split time between a high-tax state and a no-income-tax state (Florida, Texas, Nevada, Washington and others), the burden is usually on you to prove the move. Auditors compare:
- Where your "near and dear" items are — family heirlooms, pets, art.
- Where you spend more time — the day count.
- Where your active business involvement is.
- Where your family lives and children attend school.
- The size and value of homes in each state.
Paper trail checklist
- Driver's licence, vehicle registration and voter registration all in the new state.
- Declaration of domicile (Florida offers one).
- Doctors, dentists, clubs, places of worship in the new state.
- Day log with independent proof — our Day Tracker lets you log US states as separate entries.
State rules change and vary widely; check the state revenue department and a qualified adviser.