It really depends which state you lived in before you left and where you intend to return (if you do). Below is a very technical answer. If you have more questions, please ask.
Most states in the United States define “residency” based on a
person’s “domicile.” Domicile, in general, is the place which an
individual intends to be his or her permanent home and to which such
individual intends to return whenever absent.
An individual can only have one domicile at a time. Once a person
acquires a domicile, he/she retains that domicile until another is
acquired. A change of domicile requires: 1) abandonment of a prior
domicile, 2) physically moving to and residing in the new locality, and
3) intent to remain in the new locality permanently or indefinitely. If
a person moves to a new location but intends to stay there only a
limited time (no matter how long), their domicile does not change.
Some states provide exceptions to individuals being treated as
residents, even if the individuals retain their domicile in that state. Connecticut allows
Connecticut domiciled individuals to be treated as nonresidents. To
meet the requirements of the first test, an individual must:
- not maintain a permanent place of abode in Connecticut for the entire year,
- maintain a permanent place of abode outside of Connecticut for the entire year, and
- not spend more than 30 days in Connecticut during the year.
To meet the requirements of the second test, an individual must:
- be in a foreign country for at least 450 days during any period of 548 consecutive days, and
- during this period, not spend more than 90 days in Connecticut (or
have a spouse or minor children that spend more than 90 days in
Connecticut).
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