I moved from Washington state to New Jersey state early march 2019 but I work in new york state and my employer withheld NY state income tax on my W2. I also have dividend, interest and capital gain income. Do I have to file a non-resident tax return of NY which just includes my NY w-2 income and file a part-year resident return for the other items, eg interest, dividends, the capital gain on my NJ tax return?
I know I don't have to file WA income return.
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Yes, you have to file both states , NJ will credit you on taxes paid on NY state , look at line 42 from NJ tax return " Credit for income tax paid to other Jurisdiction" you should see the credit of taxes paid in NY