REFERENCE

US state residency day rules

Many states can tax you as a resident if you spend enough days there. The threshold and the definition of a "day" vary, so this reference groups states by how they treat day counts, rather than giving one number that would be wrong for many of them.

THE SHORT ANSWER

State residency for tax purposes means a state has the right to tax you as a full-year resident, on all your income, under either of two separate legal tests: domicile (your one true, permanent home, the place you intend to return to) or statutory residency (a mechanical rule that taxes you if you keep a permanent place of abode in the state and spend more than 183 days there, even when your true home is elsewhere). Either one alone is enough. Because they are separate, two states can each claim you in the same year, and you can be domiciled in one state while triggering statutory residency in another.

Read this first. Three things trip people up: (1) the "183-day rule" usually triggers at more than 183 days, meaning 184+. (2) Some states, like New York, count any part of a day as a full day. (3) The statutory-residency test also requires maintaining a permanent place of abode; days alone are not enough. Always confirm your state's current rule.

What determines state residency for tax purposes

Two tests decide it, and a state can use whichever one catches you:

Domicile test. Your domicile is your one true, permanent home, the place you intend to return to. It is about intent, not a day count, and it persists until you affirmatively establish a new one somewhere else. Your domicile state can tax you on all your income no matter how few days you spend there.
Statutory-residency test. A mechanical, day-based rule. In most income-tax states you are taxed as a full-year resident if you (1) maintain a permanent place of abode in the state and (2) spend more than 183 days there in the year, even if you are domiciled elsewhere.

Because domicile turns on intent, auditors do not take your word for it. They weigh objective facts to decide where your life is really centered. The factors that carry the most weight:

Factor auditors weigh	What they look at
Home	Where your primary, most-used residence is, its size and value relative to any other home you keep.
Time (day count)	Where you actually spend your days across the year, backed by records.
Official ties	Driver's license, voter registration, vehicle registration state.
Financial ties	Where your bank and brokerage accounts, and your primary physician, attorney, and accountant are.
Family & near-and-dear	Where your spouse and children live, and where you keep sentimental or valuable items.
Business & social	Where you work, run a business, and hold club, religious, and community memberships.

No single factor is decisive; auditors weigh them together. New York, for example, examines physical-presence logs plus a list of domicile factors under its residency-audit guidelines.

How to establish (or change) state residency: step by step

Moving your residency for tax purposes is not one form, it is a pattern of consistent actions. To leave a high-tax state cleanly you generally want to do these, and keep dated proof of each:

Get a driver's license in the new state and surrender the old one (many states require this within about 30 days of moving).
Register to vote in the new state and cancel the old registration.
Register your vehicles in the new state.
File a declaration of domicile where the new state offers one (Florida, for example).
Move your primary bank and brokerage accounts, and update the address on file everywhere.
Update professional licenses, and switch your primary physician, dentist, attorney, and accountant to the new state.
Update your will and estate documents to the new state, and register children in local schools.
Spend the days: be physically present in the new state more than in the old one, and stay under the old state's statutory-residency threshold. Keep a contemporaneous day log, because in an audit the burden of proof is on you.
File a part-year resident return in the state you left for the year of the move, and nonresident returns afterward if you still earn income sourced there.

Requirements and timelines vary by state; confirm the specifics for both the state you are leaving and the one you are joining.

Establishing residency in a no-income-tax state (e.g. Washington)

In a state with no income tax such as Washington, Texas, or Florida, there is no residency day test to become taxable, so the real task is proving you have abandoned your old state's residency. The steps above are exactly what does that: change your driver's license (within about 30 days in Washington), register to vote, move your vehicle registration and financial accounts, spend more than 183 days in the new state, and, where available, file a declaration of domicile. Then sell or rent out your prior home rather than leaving it available for your year-round use, since a retained abode is one of the two prongs of the old state's statutory-residency test.

Military and active-duty service members

Service members are the main exception to the day-count rules. The Servicemembers Civil Relief Act (SCRA) bars a state from taxing the military pay of a service member stationed there who is not domiciled in that state, so for the military the controlling concept is domicile / home of record, not physical day count. A few points that follow from that:

Being stationed in a state under orders does not make it your domicile, and being away from your home state under orders does not break your domicile there.
To change domicile, a service member takes the same affirmative steps as anyone else (voter registration, driver's license, DD Form 2058 State of Legal Residence Certificate to update the military record).
Under the Military Spouses Residency Relief Act (MSRRA), a spouse who moves to be with a service member can keep their prior domicile, and may elect to use the service member's state of legal residence, rather than becoming a resident of the duty-station state.

SCRA and MSRRA are fact-specific; confirm your situation with a base legal-assistance office or a qualified advisor.

No state income tax (no residency day test)

These states levy no broad-based personal income tax, so there is no residency day count that makes you taxable on income there. For a mover, the day-counting job is proving you stayed under the old state's threshold.

Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming

Note: Washington taxes some long-term capital gains above a threshold. New Hampshire's tax on interest and dividends has been phased out.

Statutory-residency states (more than 183 days + a home)

These states can tax you as a full-year resident if you maintain a permanent place of abode and spend more than 183 days (184+) in the state, even if you are domiciled elsewhere — the dual-residency trap, where two states can tax the same income in one year. Exact "day" definitions, transit and medical exceptions, and abode requirements differ by state; verify the specifics for your state.

State	Note
New York	184+ days and a permanent place of abode; any part of a day counts; the most aggressive auditor.
New Jersey, Connecticut, Massachusetts	Statutory-residency test on the more-than-183-days + abode pattern.
Maine, Vermont, Rhode Island, Pennsylvania	Statutory-residency test; confirm each state's day definition.
Illinois	Yes, Illinois applies a 183-day statutory-residency test: you are taxed as a resident if you are in the state more than 183 days (184+) while maintaining a home there, even if domiciled elsewhere (35 ILCS 5/1501(a)(20)).
Maryland, Delaware, District of Columbia, Colorado	Statutory-residency test; details vary.

This is not the full list of states with a statutory-residency rule, and wording differs by state. Other income-tax states may apply their own day-based or facts-based tests; check yours.

Facts-and-circumstances (no bright-line day count)

California

Uses a "closest connections" facts-and-circumstances test rather than a fixed day threshold. There is no single day number that makes you a resident.

Not tax advice. State residency rules are fact-specific, change over time, and are not fully captured by a day count. This reference is a starting point, not a determination. Confirm with your state's tax authority or a qualified advisor.

Sources: NY Dept. of Taxation & Finance; Tax Foundation, 2026 state income tax.

Frequently asked questions

Updated 2026-08-26

How do I determine my state of residency for tax purposes?

Work through the two tests. First, domicile: your one true permanent home, judged by where your home, family, financial ties, driver's license, and voter registration are. Second, statutory residency: whether you kept a place to live in a state and spent more than 183 days there. Either test can make a state tax you as a full-year resident, so check both for every state you spent real time in.

Can I be a tax resident of two states at once?

Yes. You can be domiciled in one state while triggering another state's statutory-residency test by keeping a home there and spending more than 183 days. When that happens both states can tax the same income in the same year unless a credit or the states' rules relieve the double tax. A clean day log is the main defense.

How many days can I spend in a state before owing resident taxes?

Most income-tax states use more than 183 days plus a permanent place of abode. A handful differ: some use 200 days, some use domicile only, and California weighs facts and circumstances with no bright-line count.

What counts as a day of presence?

In the strictest states, New York among them, any part of a day counts as a full day, with a narrow transit exception. Some states count only overnights. The counting standard matters as much as the threshold.

Do all states even have a day test?

No. The nine no-income-tax states have no day threshold to become taxable, and several others determine residency on domicile alone. The table above shows each state's approach.

Who has to prove the day count in an audit?

You do. Residency audits put the burden on the taxpayer, and auditors expect contemporaneous records, not reconstructions. That is the reason to keep a timestamped day log as you go.

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