The 183-day rule for US state residency: New York, California, Florida

What are the two ways a state claims you?

Every high-tax state has two separate hooks, and beating one does not beat the other. The first is domicile: the place you intend as your permanent home. Domicile follows you until you both establish a new one and abandon the old one, which is why a Manhattan apartment kept "just in case" undermines a Florida move. The second is statutory residency: a mechanical test, usually built on 183 days, that can tax you as a resident even though your domicile is genuinely elsewhere.

The two hooks work independently. A hedge-fund manager domiciled in Connecticut who keeps a pied-a-terre in Manhattan and works 200 days in the city is a New York statutory resident despite a Connecticut domicile. A retiree who swears Florida is home but never changed doctors, cars or voter registration may still be domiciled in New York despite spending most of the year in Naples. States win residency cases on both theories, and audit letters usually probe both at once.

How does the New York 183-day rule work?

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, meaning 184 or more. Both parts must hold, and any part of a day counts as a full New York day, so a late flight into LaGuardia and a next-morning departure is two days, not one.

The details come straight from the state's own definitions and its guidance on permanent place of abode. A place of abode is any dwelling you maintain that is suitable for year-round living, owned or not, and you do not need to sleep there for a day to count; presence anywhere in the state does it. Since tax year 2022, "substantially all of the year" generally means a period exceeding 10 months. New York City runs the same statutory-resident test for city tax, so the price of getting this wrong in NYC is the combined state and city rate on your entire income, not just your New York earnings.

How does California decide residency?

California has no fixed day statute. You are a resident if you are in the state for other than a temporary or transitory purpose, a facts-based test that weighs your home, family, doctors, banks and business ties. On top of that sits a presumption: spend more than nine months of the year in California and you are presumed resident, a presumption you can rebut but must actively fight.

The Franchise Tax Board's residency pages and Publication 1031 spell out the framework. Two consequences follow. Staying under 183 days, or even under six months, is not a safe harbor in California the way a day count can be elsewhere; the FTB can find residency at lower counts if your closest connections point there. And unlike New York, there is no clean two-part formula to plan against, which makes contemporaneous evidence of where you were and what ties you kept the whole defense.

What do Florida snowbirds need to document?

Two things: that Florida became the real home, and that the day count in the old state stayed low enough. Florida offers formal domicile evidence, including a sworn declaration of domicile filed with the county clerk under Florida Statute 222.17 and a homestead exemption on a Florida home. None of it helps if the old state can show 184 or more days of presence, so the day log matters as much as the paperwork.

Florida levies no personal income tax, which is why the move is worth real money and why the state you left, not Florida, is the one that will test it. New York's own rules put the burden on you: anyone domiciled outside the state who keeps a New York abode must keep records adequate to show they did not exceed 183 days. Here is how the three states compare:

How likely is a state residency audit?

For high earners leaving New York, likely enough to plan for. New York runs a standing residency audit program with published Nonresident Audit Guidelines that run to 107 pages, and the burden of proving the day count sits on the taxpayer, not the state. Auditors routinely request cell phone location records, card statements and travel logs covering every day of the year under audit.

The audits are day-by-day affairs. A day with no evidence tends to default against you, which is how people who genuinely spent the winter in Florida still lose: they can prove the big blocks but not the ragged edges, the Tuesday flight up for a board meeting, the weekend that started Thursday night. The defense is not eloquence about intent, it is a complete calendar with something behind every day.

Two worked examples with real 2026 dates

Both examples reduce to the same instrument: a trustworthy count of where you physically were, every day, kept while it happened. Staydays keeps that count automatically, logging your state and country each day with low-power background location, and exports a report you can hand to an accountant or an auditor. The data stays on your iPhone and in your private iCloud.