Did you maintain a dwelling in GA for the whole year?
I had an address in GA but during the time I was in WA, I had sublet my apartment to someone.
Did you intend to go back to GA when you went to WA?
Yes, I intended to return.
Did you establish residence in WA?
Not sure what this means - I lived there for 3 months, was interning at a company, made bulk of my income for the year over there, and was living there only.
You were a full year GA resident. You just worked an internship out of state for the summer- a temporary absence. WA has no state tax so you won't file a return with them.
If you did some of the things below and established a WA residence, then you can file a GA part year resident return.
Here are some things states look at when determining residency from The Tax Book:
Registering to vote and voting in the new state.
Purchasing residential property.
Titling and registering vehicles.
Paying state income tax to another state
Notifying the state of previous legal residence/domicile of the change in state of legal residence/domicile.
Preparing a last will and testament which indicates the new state of legal residence/domicile
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